JP2007166876A - Meandering field coil type rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a field coil type rotary electric machine that allows the reduction in size and weight. <P>SOLUTION: A rotor core 7 has a boss 71 and an even number of magnetic salient poles 72 protruding radially from outer peripheral surface of the boss 71, wherein all magnetic salient poles 72 are disposed at overlapping positions in axial direction. The field coil 9 is wound in meandering shape in such a manner that gaps between poles extending portions 92 that are provided to extend in gaps between poles that are present between the magnetic salient poles 72, 72 adjoining to each other in circumferential direction, and circumferential extending portions 91 provided to extend in circumferential direction along end surfaces of magnetic salient poles 72 are alternately strung. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a meandering field coil type rotating electrical machine.

  It is well known that a Landel-structured vehicle alternator has been manufactured as a type of field coil type rotating electrical machine. In this vehicular rotating electric machine of the Landel structure, the end surfaces of the flat ring plate shape of the bosses of the two half cores are abutted to constitute a rotor-side magnetic circuit.

In recent years, the vehicle power supply system is shifting to a multiple voltage system, and for this reason, a tandem vehicle AC generator in which the rotors of two generators are connected in tandem (cascade connection) has been proposed in Patent Documents 1-7, for example. Yes.
Japanese Patent Laid-Open No. 1-157251 JP-A-5-137295 JP-A-5-308751 JP-A-5-500300 JP-A-6-22518 JP 11-98789 A Japanese Patent Laid-Open No. 2005-117843

  Unlike the magnet-type rotating electrical machine, the field coil-type rotating electrical machine for a vehicle represented by the Landell structure vehicle alternator can easily control the stator coil voltage by controlling the field magnetic flux. Widely used in rotating electrical machines with several ranges. However, in recent years, there has been a demand for further reduction in size and weight of the vehicle alternator. However, the conventional Landel structure rotor core has a large magnetic circuit length, and thus there is a limit to reduction in size and weight, and rotational inertia is limited. Because of its large size, the rapid change performance of the rotational speed was also inferior. In other words, the field magnetic flux in the rotor core of the Landel structure flows axially outward through the claw pole portion of one half core, reaches the pillar portion on one end side in the axial direction of the rotor core, and flows inward in the axial direction inside the pillar portion. Since the structure again flows inward in the axial direction, there is a problem that the magnetic path length is long, and the rotor core weight and physique increase accordingly.

  Further, in the rotor core having the Landel structure, since the nail pole portion is supported by the one-end support structure, there is a limit to the increase in the rotational speed in terms of the centrifugal resistance of the nail pole portion. As is well known, an increase in the number of revolutions is reflected in the output in a square manner, so if the rotor core rotation speed can be further increased, the rotating electrical machine can be significantly reduced in size and weight.

  Furthermore, in the rotor core having the Landel structure, the field coil has a shape that is encased in two half cores, so that the cooling performance is inferior, and the temperature rise of the field coil has been a problem.

  In order to improve the above-mentioned problem of the Landel rotor core, in the rotating electric machine having the field coil rotor, the magnetic salient poles protrude radially from the outer peripheral surface of the boss portion at a constant pitch in the circumferential direction instead of the Landel rotor core. It is also conceivable to concentrate the field coils around these magnetic salient poles. However, such a concentrated winding type magnetic salient pole structure has a problem that it is not easy to wind the field coil, and it is particularly difficult to increase the cross-sectional area of the field coil conductor.

  In addition, it is conceivable to reduce the gap between adjacent members by making the two half cores different from each other in order to reduce the size of the conventional AC generator for the Landell structure. Therefore, a plurality of sets of expensive dies are required, and in addition to this, a plurality of sets of various rotor core manufacturing apparatuses such as an automatic handling device around the dies are also required, which causes a problem of greatly increasing the equipment cost. This problem becomes more serious in a tandem rotor structure in which two pairs of stator and rotor (stator / rotor pair) are arranged, because a total of four sets of dies are required.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a field coil type rotating electrical machine that is small and light and has excellent productivity.

  A first invention that solves the above problems includes a housing, a rotating shaft that is rotatably supported by the housing, a stator core that is fixed to an inner peripheral surface of the housing, a stator coil that is wound around the stator core, A rotor core fixed to the rotating shaft and having a predetermined number of magnetic poles sequentially arranged in the circumferential direction across at least a predetermined gap between the magnetic poles extending in the axial direction; and each magnetic pole wound around the rotor core Field coil type rotating electrical machine comprising a field coil magnetized alternately in the circumferential direction and a field coil feeding mechanism comprising a slip ring for supplying a field current fed from a brush on the housing side to the field coil Applies to

  This field coil type rotating electrical machine is known as a field coil type synchronous machine having a so-called inner rotor structure. In addition, although a field coil is essentially wound around the rotor core of the present invention to generate a field magnetic flux, it goes without saying that a permanent magnet may be additionally provided.

  According to a first aspect of the present invention made to solve the above problems, the rotor core has a boss portion and a predetermined number of magnetic salient pole portions that project radially from the outer peripheral surface of the boss portion and respectively constitute the magnetic poles. The field coil is meandered between the magnetic pole gaps. Hereinafter, the field coil having this shape is also referred to as a meandering field coil.

  The rotor of the present invention having the meandering field coil described above can reduce the amount of axial movement of the magnetic flux in the rotor core as compared with the conventional Landell-type rotor core, so that the rotor core can be reduced in size and weight and the magnetic resistance can be reduced. be able to.

  In particular, the boss portion of the rotor core, that is, the magnetic circuit portion that connects a pair of magnetic salient pole portions adjacent to each other in the circumferential direction, forms a yoke portion in a so-called magnetic circuit. Since half of the magnetic flux that flows in the radial direction through the salient pole portion only needs to flow in the circumferential direction, the cross-sectional area of the magnetic path can be made significantly higher than that of the boss portion of the conventional Landell rotor core. On the other hand, the boss part of the Landel type rotor core (which can be considered as a yoke part) is remarkably wide since all the magnetic salient pole parts must flow through the common boss part in the axial direction. Requires a cross section perpendicular to the magnetic path.

  Further, the circumferential length of the boss portion that magnetically connects two magnetic salient pole portions adjacent to each other is determined by arranging the boss portions radially inward because the magnetic salient pole portions are arranged radially. As compared with a conventional rotor core having a Landell structure, the length becomes shorter. This means that the boss portion, that is, the so-called yoke portion can be significantly reduced in size and weight and the magnetic resistance can be reduced. This means that there is a space for arranging a through hole for circulating cooling air in the axial direction on the radially inner side of the rotor core, for example, in the boss portion. This further reduces the size and weight of the rotor core and reduces field coils. There is also an advantage that the possibility of forming a ventilation path is generated.

  In a preferred aspect, each of the rotor cores has the field coil and is arranged in a plurality of tandems on the same rotating shaft in the axial direction with a predetermined inter-core gap, and the field coils are arranged on the rotor cores. It is wound individually. In this way, in the tandem rotating electrical machine in which the cooling performance of the coil end of the stator coil and the field coil deteriorates, the coil end and the field of the stator coil are reduced by the size of the rotor core compared to the conventional Landell structure. It is easy to form a ventilation path for cooling the magnetic coil.

  In a preferred aspect, the two rotor cores adjacent to each other in the axial direction have the magnetic salient pole portions at substantially the same position in the circumferential direction, and the field coil extends between the cores through the gap between the cores. And the circumferentially extending portion of one of the two field coils adjacent to each other in the axial direction are alternately connected to the circumferentially extending portion extending in the circumferential direction along the end surface of the rotor core. Is disposed at substantially the same position as the other circumferentially extending portion of the two field coils. In this way, the axial length of the tandem rotor core can be shortened.

  In a preferred aspect, the field coil is provided adjacent to an end face on one end side in the axial direction of the odd-numbered magnetic salient pole part and an end face on the other end side in the axial direction of the even-numbered magnetic salient pole part. A circumferentially extending portion extending in the direction, and a gap extending portion between the magnetic poles extending between the magnetic pole gaps and connecting the two circumferentially extending portions adjacent to each other in the circumferential direction, The magnetic salient pole portion has an axial direction so that an end face close to the circumferentially extending portion of the field coil has a smaller circumferential length than an end face close to the circumferentially extending portion of the field coil. Are inclined at a predetermined angle. In this way, the length of the field coil can be shortened and the magnetic noise can be reduced by smoothing the magnetic flux change of the stator coil. In a preferred aspect, the predetermined angle is set to 5 to 45 °.

  In a preferred aspect, the boss portion has a through hole penetrating in the axial direction. As a result, the rotor core is lighter and the cooling performance of the field coil and the stator coil is improved. This aspect is particularly useful in a tandem rotor core in which it is difficult to cool the coil ends of the stator coils and the field coils arranged between the cores. In a conventional Landell rotor core, it is difficult to provide such a through hole while avoiding a reduction in the amount of field magnetic flux. However, in the rotor core around which the meandering coil of the present invention is wound, so-called The cross-sectional area in the direction perpendicular to the magnetic path of the yoke part, i.e., the boss part, may be small, and the length of the magnetic path of the yoke part, i.e., the boss part, is remarkably short. It is possible to form a through hole in the axial direction while avoiding a reduction in the amount of magnetic flux.

  In a preferred aspect, an axial flow blade portion is provided in the through hole and biases air toward one side in the axial direction. Thereby, the cooling air flow can be blown in the axial direction, and the coil end of the stator coil and the field coil can be further cooled.

  In a preferred aspect, the axial flow blade portion feeds air between the core gaps of the tandem rotor core. That is, in this aspect, since the cooling air flow is supplied between the core gaps, which are gaps between the two rotor cores arranged close to the rotation axis in the axial direction, the coil ends of the stator coils arranged between the core gaps, The field coil can be cooled well.

  In a preferred embodiment, the magnetic field coil includes a centrifugal blade that is fixed to an axial end surface of the magnetic salient pole portion that is not adjacent to the circumferential extension portion of the field coil and supplies centrifugal air to the coil end of the stator coil. In this way, the coil end of the stator coil can be cooled well without increasing the axial length.

  In a preferred aspect, the rotor core is a single piece. Thereby, manufacture becomes easy, the number of molds can be reduced, and the excitation current can also be reduced by reducing the magnetic resistance.

  In a preferred aspect, an end surface of the magnetic salient pole portion adjacent to the field coil has a hollow portion in which the field coil is accommodated. As a result, the centrifugal force applied to the field coil can be supported by the magnetic salient pole portion of the rotor core, so that high-speed rotation performance can be improved and the outer peripheral surface portion of the magnetic salient pole portion, that is, the magnetic pole surface of the rotor and the inner peripheral surface of the stator core. Since the total area of the effective magnetic pole gap can be increased, the magnetic resistance of the magnetic circuit can be reduced and the exciting current can be reduced.

  In a preferred aspect, a circumferentially extending portion extending in the circumferential direction of the field coil does not protrude outward in the axial direction from the recessed portion. Thereby, the high-speed rotation performance can be further improved.

  In a preferred aspect, the magnetic salient pole portion has a substantially constant cross-sectional area in the direction perpendicular to the magnetic path, so that the rotor core can be reduced in size and weight.

  In a preferred embodiment, the magnetic salient pole portion includes a resin insulating film that is attached to at least a surface of the magnetic salient pole portion that contacts the field coil to electrically insulate the field coil from the magnetic salient pole portion. Thereby, the number of parts can be reduced and the number of assembling steps can be reduced.

  In a preferred aspect, the cross-sectional area of the magnetic salient pole portion in the direction perpendicular to the magnetic path is set to approximately twice the cross-sectional area of the boss portion in the direction perpendicular to the magnetic path, so that the rotor core can be reduced in size and weight.

  In a preferred aspect, the end surface on the one end side in the axial direction of the odd-numbered magnetic salient pole portion not adjacent to the field coil is on the one end side in the axial direction of the even-numbered magnetic salient pole portion adjacent to the field coil. The end face on the other end side in the axial direction of the even-numbered magnetic salient pole portion that is arranged at a position shifted toward the one end side in the axial direction from the end face is not adjacent to the field coil. It arrange | positions in the position shifted | deviated to the axial direction other end side rather than the end surface of the axial direction other end side of the said magnetic salient pole part. Thereby, the axial direction length of the rotor which consists of a field coil and a rotor core can be shortened.

  In a preferred aspect, the axially central portion of the boss portion of the rotor core has a larger radial length than the axial end portion of the boss portion. Thereby, the magnetic path length in a rotor core can be shortened.

  In a preferred aspect, since the field coil is formed of a rectangular wire, it is possible to earn a required ampere turn while reducing the number of windings.

  In a preferred aspect, the field coil includes a power supply control circuit that performs intermittent power supply with a duty ratio of 20% or less. Thereby, loss heat generation of the switching transistor of the power supply control circuit can be reduced.

  In a preferred aspect, the power supply control circuit includes a flywheel diode that is installed closer to the field coil than the slip ring and allows a flywheel current to flow through the field coil. Thereby, the loss of a slip ring and a brush, heat_generation | fever can be reduced, and a flywheel diode can also be cooled favorably.

  In a preferred embodiment, the flywheel diode is a Schottky barrier diode. Thereby, the loss and heat generation of the flywheel diode can be further reduced.

  In a preferred aspect, the end surface of the magnetic salient pole portion that is in contact with the circumferentially extending portion of the field coil that extends in the substantially circumferential direction while being curved has a curved shape of the circumferentially extending portion of the field coil. It is chamfered along. Thereby, the amount of field magnetic flux can be increased while suppressing an increase in physique.

  In a preferred aspect, the rotor core is broken into two half cores along the gap between the magnetic pole gaps at a substantially radial inner side of the field coil, and one of the two half cores is an odd number of the magnetic cores. The other half of the two half cores is formed integrally with the even-numbered magnetic salient poles, and the field coil is formed in advance and interposed between the two half cores. The

  In this way, it is possible to use a pre-molded field coil in the same way as the Landell structure rotor, while realizing a reduction in the rotor weight and downsizing significantly compared to the Landel structure rotor. Simplification is possible. Furthermore, since the contact area between the two half cores can be increased, the magnetic resistance can be reduced and the excitation current can also be reduced.

  In a preferred aspect, the magnetic coil is disposed on the radially outer side of the circumferentially extending portion of the field coil projecting axially outside the end surface of the magnetic salient pole portion and radially inward of the coil end of the stator coil. A field coil support member having a non-magnetic cylindrical portion that receives the centrifugal force of the circumferentially extending portion is provided. In this way, the cross-sectional area of the magnetic salient pole portion in the direction perpendicular to the magnetic path is not reduced. The centrifugal resistance of the field coil can be improved.

  In a preferred aspect, the field coil support member includes a disk portion that is supported by the rotating shaft and extends radially outward to support the cylindrical portion. Thereby, the field coil support member can only have a good centrifugal force resistance performance.

  Furthermore, if the field coil support member is provided with a centrifugal blade, the cooling performance of the coil end of the stator core can be improved with a small number of parts.

  In a preferred aspect, the field coil support member is supported by the magnetic salient pole part. In this way, the structure of the field coil support member can be simplified.

  In a preferred aspect, the boss portion of the rotor core is integrated with the odd-numbered magnetic salient pole portion and has a groove portion that opens to one side in the axial direction, and the even-numbered magnetic salient pole portion is: The boss portion has a shape that cannot be pulled out radially outward from the groove portion, and is fitted into the groove portion from the axial direction, and the field coil is pre-shaped and the fitting of the even-numbered magnetic salient pole portions is performed. It is mounted from the axial direction at a position along the odd-numbered magnetic salient pole part. In this way, it is possible to employ a pre-shaped field coil while reducing the number of joint portions between the boss portion and the magnetic salient pole portion.

  In a preferred aspect, the outer peripheral end portion of the magnetic salient pole portion protrudes in the circumferential direction or the axial direction from the radially inner portion of the outer peripheral end portion, and expands the magnetic pole surface facing the inner peripheral surface of the stator core. Has a buttock. Thus, the centrifugal force applied to the field coil can be supported, the total area of the effective electromagnetic gap between the rotor core and the stator core can be increased, the magnetic resistance can be reduced, and the excitation current can be reduced.

  In a preferred aspect, the portion of the flange adjacent to the radially outer side of the circumferentially extending portion that is a portion extending in the circumferential direction of the field coil is longer than other portions of the flange. It protrudes. As a result, the centrifugal force applied to the circumferentially extending portion of the field coil can be supported, the total area of the effective electromagnetic gap between the rotor core and the stator core can be increased, the magnetic resistance can be reduced, and the excitation current can be reduced. Can be reduced.

  In a second invention made to solve the above problems, the rotor cores each have the field coil and are arranged in a tandem pair with a predetermined inter-core gap in the axial direction on the same rotating shaft, The field coils are individually wound around the pair of rotor cores, a pair of the slip rings are arranged, and a first current direction determining diode is connected in series with one of the pair of field coils, A second current direction determining diode is connected in series with the other of the pair of field coils, and the field coil power supply mechanism transmits the AC voltage supplied from the full bridge inverter circuit through the current direction determining diode. It is characterized by being applied to a pair of field coils.

  In this way, since the current to the two field coils can be independently controlled using a pair of slip rings and a pair of brushes, the reliability of the field current feeding mechanism can be improved and the axial direction of the rotating electrical machine can be adjusted. Since it can be shortened, the size and weight can be reduced.

  An embodiment in which the meandering field coil type rotating electrical machine of the present invention is applied to a tandem rotating electrical machine for a vehicle will be described below. However, the present invention is not limited to the following embodiments, and it is obvious that the present invention may be configured by combining other known techniques or techniques having the same necessary functions.

(First embodiment)
(Overall structure)
FIG. 1 is an axial sectional view showing the overall structure of a vehicular AC generator having a tandem rotor structure. 1 is a housing, 2 is a first stator core, 3 is a second stator core, 4 is a first stator coil, 5 is a second stator coil, 6 is a rotating shaft, 7 is a first rotor core, 8 is a second rotor core, and 9 is a first 1 field coil, 10 is a second field coil, 11 is a pulley, 12 and 13 are slip rings, and 14 and 15 are brushes.

  The housing 1 includes a front housing 1a, a center housing 1b, and a rear housing 1c, and is configured by fastening through bolts.

  The first stator core 2 is clamped in the axial direction between the front housing 1a and the center housing 1b and fixed to the housing 1, and the second stator core 3 is clamped in the axial direction between the center housing 1b and the rear housing 1c. 1 is fixed. The first stator coil 4 is wound around the first stator core 2 and the second stator coil 5 is wound around the second stator core 3 by a usual method.

  The rotary shaft 6 is supported by the housing 1 via bearings 16 and 17, and a pulley 11 is fitted and fixed to a front end portion of the rotary shaft 6 that protrudes forward from the housing 1. A pair of slip rings 12 and 13 are fitted and fixed to the rear end of the rotating shaft 6, and the brush 14 is in sliding contact with the slip ring 12 and the brush 15 is in sliding contact with the slip ring 13.

  The first rotor core 7 is fixed to the rotary shaft 6 at a position facing the inner peripheral surface of the first stator core 2, and a first field coil 9 is wound around the first rotor core 7 to constitute the first rotor. is doing. The second rotor core 8 is fixed to the rotary shaft 6 at a position facing the inner peripheral surface of the second stator core 3, and a second field coil 10 is wound around the second rotor core 8 around the second rotor core 8. 2 rotors are configured.

(Field current control)
Control of the field current supplied to the first field coil 9 and the second field coil 10 will be described with reference to FIG.

  Reference numeral 16 denotes a regulator fixed to the housing, and the regulator 16 incorporates a full-bridge inverter circuit composed of transistors 17 to 20 for controlling the field current. This inverter circuit feeds a field current to the field coils 9 and 10 through a power feeding mechanism including a pair of slip rings 12 and 13 and a pair of brushes 14 and 15 and current direction regulating diodes 21 and 22. Yes. Reference numerals 23 and 24 denote flywheel diodes formed of Zener diodes or Schottky diodes. The diode 23 constitutes a circulating circuit of the field coil 9, and the diode 24 constitutes a circulating circuit of the field coil 10.

  The operation of the regulator 16 will be described below.

  The inverter circuit includes a first field coil power supply mode that applies a positive voltage to the brush 14 and a negative voltage to the brush 15, and a second field coil power supply mode that applies a positive voltage to the brush 15 and a negative voltage to the brush 14. And a power supply stop mode in which power supply to both of the field coils 9 and 10 is stopped. The first field coil power supply mode is implemented by turning on the transistors 19 and 18, the second field coil power supply mode is implemented by turning on the transistors 20 and 17, and the power supply stop mode is the transistors 17 to 20. This is done by turning off all of them.

  The diode 21 permits energization to the field coil 9 in the first field coil power feeding mode, and the diode 22 permits energization to the field coil 9 in the second field coil power feeding mode.

  In this embodiment, the transistors 17 to 20 of the inverter circuit are PWM controlled at a predetermined carrier frequency. This will be described in more detail with reference to FIG. S1 is a PWM signal for intermittently controlling the transistors 18 and 19, and S2 is a PWM signal for intermittently controlling the transistors 17 and 20, whereby an alternating PWM voltage V is applied between the pair of brushes 14 and 15. The regulator 16 outputs the control signal S1 in the odd-numbered PWM cycle that is a constant cycle, and outputs the control signal S2 in the even-numbered PWM cycle. In this embodiment, the odd-numbered PWM cycle and the even-numbered PWM cycle are set equal, but may be different. Therefore, in this embodiment, the maximum duty ratio of the field current fed from the regulator 16 to the field coil 9 and the maximum duty ratio of the field current fed from the regulator 16 to the field coil 10 are 50%, respectively. It becomes as follows. More preferably, the first field coil 9 and the second field coil 10 are preferably intermittently fed with a duty ratio of 20% or less. Thereby, the recirculation period in which the field current does not pass through the slip rings 12 and 13 can be lengthened, and the durability of the slip rings 12 and 13 and the brushes 14 and 15 can be improved.

  This problem will be described in more detail.

  As described above, in this embodiment, since the first field coil 9 and the second field coil 10 are alternately energized, the maximum duty ratio of the first field coil 9 and the maximum of the second field coil 10 are set. Each duty ratio is set to 50%. Further, considering the energization period to the first field coil 9, when energization from the inverter circuit is performed at this time, the current flowing through the first field coil 9 increases from the initial value to the final value, and then the inverter circuit. When energization from is interrupted, the current drops from the final value to the substantially initial value due to the circulating current. Therefore, the energization from the inverter circuit can be saved by setting the circulation period to be approximately the same as the energization period from the inverter circuit.

  However, in this embodiment, by using two pairs of brushes and slip rings, the field currents to the two field coils 9, 10 can be controlled independently, and the axial direction of the rotating electrical machine is correspondingly increased. The length can be shortened and the excellent effect of improving the reliability can be achieved.

(Structure of the first rotor core 7)
Next, the first rotor core 7 will be described in detail with reference to FIG. 1, FIG. 4, and FIG. 4 is a development view taken along line AA in FIG. 1, and FIG. 5 is a front view of the first rotor as viewed in the axial direction. The first rotor core 7 includes a boss portion 71 fitted and fixed to the rotary shaft 6, and an even number of magnetic salient pole portions 72 that protrude radially from the outer peripheral surface of the boss portion 71 and constitute magnetic poles.

  As shown in FIG. 1, the boss portion 71 has a predetermined number of through-holes 73 extending in the axial direction at regular intervals in the circumferential direction, and each through-hole 73 is inclined at a predetermined angle in the circumferential direction. . The front end opening of the through hole 73 of the boss portion 71 is disposed upstream of the rear end opening in the rotation direction. Thereby, the air in the through-hole 73 is urged | biased to the rear-end opening side with rotation of the boss | hub part 71, and an axial flow ventilation function can be obtained easily. Moreover, you may provide a dent in the front-end opening in the direction which takes in a wind from the upstream of a rotation direction.

  Instead of forming the through hole 73 obliquely in the circumferential direction, an axial flow blade portion that blows out the cooling air flow sucked in from the front side may be disposed in the through hole 73 or in the front end opening or the rear end opening thereof. Good. The cooling air flow coming out of the through hole 73 cools the coil ends of the field coils 9 and 10 and the stator coils 4 and 5 and is discharged to the outside from the hole opened in the center housing 1b. In addition, the cross-sectional shape of the through-hole 73 provided in the boss | hub part 71 is free.

(Structure of magnetic salient pole part 72)
As shown in FIGS. 4 and 5, a total of 12 magnetic salient pole portions 72 protrude in the radial direction from the outer peripheral surface of the boss portion 71. Each magnetic salient pole portion 72 has a hexagonal column shape, and its outer peripheral surface portion constitutes a magnetic pole surface. However, the boss part 71 and each magnetic salient pole part 72 are mild steel products formed integrally.

  The odd-numbered magnetic salient pole portions 72 include an end surface 721 having a relatively short circumferential length, an end surface 722 having a relatively long circumferential length, axial side surfaces 723 and 724 extending in the axial direction, and a side surface 723. , 724 and slanted side surfaces 725, 726 inclined toward the boundary with the end surface 721. The end surface 721 is an end surface adjacent to the circumferentially extending portion 91 of the first field coil 9. As shown in FIG. 4, the even-numbered magnetic salient poles 72 have a shape obtained by rotating the odd-numbered magnetic salient poles 72 by 180 degrees.

  Thus, a gap S between the magnetic poles is formed between the two magnetic salient pole portions 72 and 72 adjacent to each other in the circumferential direction. θ is an angle of the oblique side surfaces 725 and 726 with respect to the axial direction. θ is set to 5 to 45 °.

  The first field coil 9 is formed by winding a rectangular wire for a predetermined turn between the magnetic salient pole portions 72. More specifically, the first field coil 9 includes a circumferentially extending portion 91 extending in the circumferential direction adjacent to the end surface 721 and a gap S between the magnetic poles along the oblique side surfaces 725 and 726 with respect to the axial direction. Thus, the gap extending portions 92 between the magnetic poles extending obliquely are alternately connected. That is, the first field coil 9 is meanderingly disposed in the gaps S between the magnetic poles. Thus, when a DC field current is passed through the first field coil 9, the odd-numbered magnetic salient pole portions 72 and the even-numbered magnetic salient pole portions 72 are excited in opposite polarities.

(Structure of the second rotor core 8)
Next, the second rotor core 8 has the same structure as the first rotor core 7 and has a shape in which the first rotor core 7 is shifted by a predetermined distance in the axial direction. Therefore, as shown in FIG. 1, a predetermined number of through holes 83 are provided in the boss portion 81 of the second rotor core 8 in the axial direction at regular intervals in the circumferential direction, and each through hole 83 extends in the circumferential direction. A predetermined angle is provided. However, the rear end opening of the through hole 83 of the boss portion 81 is disposed upstream of the front end opening in the rotation direction. Thereby, the air in the through-hole 73 is urged | biased to the front-end opening side with rotation of the boss | hub part 71, and an axial flow ventilation function can be obtained easily. Moreover, you may provide a hollow in the direction which takes in a wind from a rotation direction upstream in a rear-end opening.

(Structure of magnetic salient pole part 82)
The magnetic salient pole portion 82 of the second rotor core has the same shape as the magnetic salient pole portion 72 of the first rotor core 7, and the magnetic salient pole portion 72 and the magnetic salient pole portion 82 are arranged at the same position in the circumferential direction. Yes. Thereby, the 2nd field coil 10 becomes the shape which shifted the 1st field coil 9 to the axial direction. Therefore, when a DC field current is passed through the second field coil 10, the odd-numbered magnetic salient pole portions 82 and the even-numbered magnetic salient pole portions 82 are excited in opposite polarities.

  What is important here is the circumferential extension of the second field coil 10 arranged at the same circumferential position as the circumferential extension 91 of the first field coil 9 located on the front end side of the first rotor core 7. The second field is disposed on the front end side of the second rotor core 8 and is disposed at the same position in the circumferential direction as the circumferentially extending part 91 of the first field coil 9 located on the rear end side of the first rotor core 7. The circumferentially extending portion of the magnetic coil 10 is disposed on the rear end side of the second rotor core 8. In this way, in the inter-core gap C between the first rotor core 7 and the second rotor core 8, the circumferentially extending portion (mountain portion) of the first field coil 9 and the second field coil 10. Since the circumferentially extending portion (mountain portion) is not disposed at the same position in the circumferential direction, the axial width of the inter-core gap C can be reduced.

(Modification)
In the above-described embodiment, a resin sheet (not shown) is wound around each of the magnetic salient pole portions 72 and 82, and then the first field coil 9 and the second field coil 10 made of rectangular wires are meandered. However, according to this method, it is necessary to take measures against the centrifugal force applied to the resin sheet. In order to solve this problem, it is preferable to deposit a resin insulating film on the surfaces of the first rotor core 7 and the second rotor core 8 by various known film forming methods. Thus, the first field coil 9 and the second field coil 10 made of rectangular wires can be meandered and wound directly on the first rotor core 7 and the second rotor core 8 without using a coil bobbin or a separate sheet. Is also simplified.

(Modification)
In a preferred embodiment, the cross-sectional areas of the same diameter cross section (also referred to as the cross-sectional area perpendicular to the magnetic path) of each part of the magnetic salient pole portions 72 and 82 are designed to be equal within a tolerance range of 10%. However, a large cross-sectional area in the direction perpendicular to the magnetic path may be given to the tip and base ends of the magnetic salient pole portions 72 and 82. The distal end portions of the magnetic salient pole portions 72 and 82 referred to here refer to a range of 10% of the distal end side of the height in the total radial direction, and the proximal end portions referred to herein are the entire diameters thereof. The range of 10% of the base end side of the direction height is said. An increase in the cross-sectional area perpendicular to the magnetic path (same-diameter cross-sectional area) on the tip side of the magnetic salient pole portions 72 and 82 increases the effective area of the electromagnetic gap between the rotor core and the stator core. , 82 results in the formation of a flange at the tip of the magnetic field circuit 82, thereby reducing the magnetic resistance of the magnetic circuit to reduce the field current, and the first field coil 9 and the second field magnet. This means that the centrifugal force of the coil 10 can be carried by this flange.

(Modification)
In a preferred embodiment, the cross-sectional area of the magnetic salient poles 72 and 82 in the direction perpendicular to the magnetic path (here, the same cross-sectional area) is set to approximately twice the cross-sectional area of the bosses 71 and 81 in the direction perpendicular to the magnetic path. . In addition, the magnetic path perpendicular direction cross-sectional area of the boss | hub parts 71 and 81 shall mean the one side part of the radial direction cross-section parts of the two boss | hub parts 71. FIG. In this way, the rotational inertial mass can be reduced by reducing the size and weight of the boss portion 71 without causing a reduction in the amount of field magnetic flux.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. 6 is a sectional view in the axial direction of the rotating electrical machine, FIG. 7 is a developed view taken along the line AA in FIG. 6, and FIG. 7 is a front view as viewed in the axial direction of the first rotor. In this embodiment, only the main feature point is that the shape of the magnetic salient pole portions 72 and 82 is changed in the first embodiment described above. The magnetic salient pole portion 72 and the magnetic salient pole portion 82 are Since they have the same shape, only the shape of the magnetic salient pole portion 72 will be described in detail below.

(Structure of magnetic salient pole part 72)
As shown in FIGS. 4 and 5, a total of 12 magnetic salient pole portions 72 of this embodiment protrude in the radial direction from the outer peripheral surface of the boss portion 71. Each magnetic salient pole portion 72 has a thick plate shape whose longitudinal direction is the radial direction, and the width direction of the magnetic salient pole portion 72 is set to the axial direction and the thickness direction is set to the circumferential direction. Therefore, the gap S between the magnetic poles extends in the axial direction. Of course, the shape of the cross section with the same diameter between the magnetic pole gaps, that is, the shape of the cross section in the direction perpendicular to the magnetic path can be variously changed, such as a hexagon as shown in the first embodiment or a chamfered shape as shown in FIG. It is.

  In this embodiment, a recess 727 for accommodating a field coil as shown in FIG. 6 is provided on the end face of the magnetic salient pole portion 72 adjacent to the circumferentially extending portion 91 of the first field coil 9. Is the feature.

  The recess 727 is formed from the vicinity of the tip (outer peripheral surface) of the magnetic salient pole portion 72 to the outer peripheral surface of the boss 71 as shown in FIG. Has been. The circumferentially extending portion 91 of the first field coil 9 is completely accommodated in the recessed portion 727, and the circumferentially extending portion 91 does not protrude outward in the axial direction from the recessed portion 727. Thereby, the centrifugal force applied to the first field coil 9 can be favorably carried on the magnetic salient pole portion 72.

  Next, in this embodiment, as shown in FIG. 7, the end surface 721 of the magnetic salient pole portion 72 on the side adjacent to the circumferentially extending portion 91 of the first field coil 9 is the circumference of the first field coil 9. The cross section is chamfered according to the curved shape of the direction extending portion 91 to have a substantially anti-semicircular cross section. In this way, processing of the first field coil 9 made of a rectangular wire having a large cross-sectional area is facilitated, and the circumferentially extending portion 91 of the first field coil 9 and the end surface 721 of the magnetic salient pole portion 72 are There is an advantage that no useless space is generated between the two.

(Boss 71)
Next, the boss portion 71 of the first rotor core 7 will be described below. In this embodiment, as shown in FIGS. 6 and 8, the boss portion 71 includes an inner cylinder portion 711 fitted to the rotating shaft 6, and an outer cylinder portion in which magnetic salient pole portions 72 are erected radially from the outer peripheral surface. 712 and a plurality of radial beam portions 713 that are radially formed and connect the inner cylinder portion 711 and the outer cylinder portion 712, and a through hole 73 is formed between the radial beam portions 713 and 713 adjacent to each other in the circumferential direction. Many are formed. Each radial beam portion 713 is obliquely inclined at the same oblique angle to the same side in the circumferential direction for the same purpose as that of the first embodiment, whereby each radial beam portion 713 forms an air flow flowing in the axial direction with rotation. .

  In the boss portion 71, the field magnetic flux flowing between the magnetic salient pole portions 72, 72 adjacent to each other in the circumferential direction mainly flows in the outer cylinder portion 712 in the circumferential direction. Of course, it is also possible to flow through the radial beam portion 713 and the inner cylinder portion 711, but this is ignored in this embodiment because the magnetic path length increases. Therefore, it can be mainly regarded as the outer cylindrical portion 712 that functions as a yoke portion between the magnetic salient pole portions 72 and 72 referred to in the present invention.

  In this embodiment, as shown in FIG. 6, the outer cylinder portion 712 that forms the boss portion referred to in the present invention is formed such that the axial center portion rises radially outward from both axial end portions. In this way, the magnetic field flux that has moved in the magnetic salient pole portion 72 to the one side in the axial direction (the side without the dent portion 727) due to the depression of the dent portion 727 described above is thickened in the radial direction. Since a large amount flows through the central portion in the axial direction of the outer cylinder portion 712, there is no need to return to the end portion of the boss portion 71 on the recess portion 727 side, and as a result, a magnetoresistance reduction effect by shortening the magnetic path length can be realized. .

  Since the second rotor core 8 has the same shape as the first rotor core 7, the description thereof is omitted.

(Centrifugal cooling fan)
In this embodiment, the centrifugal cooling fan 31 is fixed to the front end face of each magnetic salient pole portion 72, and the centrifugal cooling fan 32 is fixed to the rear end face of each magnetic salient pole portion 82. The centrifugal cooling fan 31 includes a ring plate portion 311 fixed to the front end surface of each magnetic salient pole portion 72, and a centrifugal blade 312 protruding from the ring plate portion 311 in the axial direction. Similarly, the centrifugal cooling fan 32 includes a ring plate portion 321 fixed to the rear end surface of each magnetic salient pole portion 82, and a centrifugal blade 322 protruding in the axial direction from the ring plate portion 321. As a result, the coil ends of the stator coils 4 and 5 can be satisfactorily cooled as in the conventional AC generator for a Landell structure.

(Modification)
In the magnetic salient pole portion 72 shown in FIGS. 6 to 8, the cross-sectional area of the magnetic salient pole portion 72 in the same radial cross section (cross section in the direction perpendicular to the magnetic path) is constant in each radial direction portion. For this reason, the formation of the recess 727 causes a reduction in the cross-sectional area in the direction perpendicular to the magnetic path of the magnetic salient pole 72 at the radial position where the axial depth of the recess 727 is the maximum. This problem is caused by increasing the thickness in the circumferential direction of the magnetic salient pole part 72 in the vicinity of the radial position where the axial depth of the recess part 727 is the maximum, further from the radially inner side of the magnetic salient pole part 72. Can be reduced. Optimally, the same radial cross-sectional area of the magnetic salient pole part 72, that is, the cross-sectional area perpendicular to the magnetic path is equalized in each radial part of the magnetic salient pole part 72. In this way, it is possible to realize a reduction in size and weight of the magnetic salient pole portion 72 without reducing the amount of field magnetic flux.

(Third embodiment)
A third embodiment will be described with reference to FIGS. FIG. 9 is a developed view in which the magnetic salient pole portion 72 of the first rotor core 7 is cut in the circumferential direction at the central portion in the radial direction and developed. FIG. 10 is a magnetic salient pole portion 72 when the magnetic salient pole portion 72 is viewed in the centripetal direction. FIG. 11 is an axial sectional view of the first rotor core 7.

  In this embodiment, in the second embodiment (see FIG. 6), the centrifugal force applied to the circumferentially extending portion 91 of the field coil 9 is applied to the outer peripheral surface portion of the magnetic salient pole portion 72, that is, without the depression 727. The structure is supported by the part.

  Similar to the magnetic salient pole portion 72 of the first embodiment shown in FIG. 4, the magnetic salient pole portion 72 is formed in the same shape in each radial portion and is arranged radially. However, the outer peripheral surface portion, that is, the tip portion of the magnetic salient pole portion 72 has a flange portion 74 that protrudes toward the circumferentially extending portion 91 of the first field coil 9 as shown in FIG. The flange 74 carries a centrifugal force applied to the first field coil 9. The first field coil 9 is wound with a uniform thickness over substantially the entire surface excluding the tip of the magnetic salient pole portion 72, that is, up to the vicinity of the outer peripheral surface of the boss portion 71. Thereby, the protrusion amount to the axial direction or the circumferential direction of the 1st field coil 9 can be reduced. Reference numeral 92 denotes a gap extending portion between the magnetic poles of the first field coil 9, which is inclined at a predetermined angle with respect to the axial direction along the side surface of the magnetic salient pole portion 72.

  The important point of this embodiment is that, as shown in FIG. 9, the front end surface X of the odd-numbered magnetic salient pole portion 72 is substantially the first field coil than the front end surface X ′ of the even-numbered magnetic salient pole portion 72. The rear end surface Y of the even-numbered magnetic salient pole portion 72 is substantially thicker than the rear end surface Y ′ of the odd-numbered magnetic salient pole portion 72. This is the point that is offset backward. Accordingly, the cross-sectional area in the direction perpendicular to the magnetic path of each part in the radial direction of the magnetic salient pole part 72 is made constant without forming the recess part 727 as in the second embodiment, and the circumferential direction of the first field coil 9 is fixed. The extending portion 91 can be pressed by the flange portion 74.

  The rotor core structure of this embodiment has a shape in which the Landel structure is strongly compressed in the axial direction, but the odd-numbered magnetic salient poles (columns) and the even-numbered magnetic salient poles (columns) are axial. Compared to the Landell structure that does not overlap in the direction, the odd-numbered magnetic salient poles and the even-numbered magnetic salient poles overlap significantly in the axial direction, so the first rotor core 7 is reduced in size and weight, and the magnetic path length is shortened. Such effects can be expected. The odd-numbered magnetic salient pole portion and the even-numbered magnetic salient pole portion can be significantly overlapped in the axial direction because the first field coil 9 is meandered. Is.

  Furthermore, in this embodiment, the centrifugal blade 33 is welded to the end surface 722 of each magnetic salient pole portion 72 on the side not adjacent to the circumferentially extending portion 91. In this way, compared to the second embodiment (see FIG. 6), since the annular plate part harmful to the cooling of the first field coil 9 can be omitted, the first field coil 9 can be cooled well. Can do. In FIG. 10, reference numeral 34 denotes a centrifugal blade fixed to the end surface 722 of the magnetic salient pole portion 72 of the second rotor core 8.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIG. FIG. 12 is a partial circumferential development view of the first rotor core 7.

  As in the other embodiments, the first rotor core 7 includes a boss portion 71 and an even number of magnetic salient pole portions 72 that protrude radially from the outer peripheral surface of the boss portion 71. The feature of this embodiment is that the cylindrical boss 71 is broken along the cut surface 100 indicated by a broken line in FIG. 12 to be divided into a boss 71a and a boss 71b.

  As can be seen from FIG. 12, the cut surface 100 is formed substantially along the first field coil 9. The front end surface of the boss portion 71 is disposed in front of the front end surface of the magnetic salient pole portion 72 by a predetermined distance, and the rear end surface of the boss portion 72 is behind the rear end surface of the magnetic salient pole portion 72 by a predetermined distance. Has been placed. Therefore, the boss portion 71a and the boss portion 71b are fitted to each other at the meandering cut surface, in other words, the convex portion protruding in the axial direction at the cut surface formed at the circumferential magnetic pole pitch.

  In this way, the first field coil 9 formed in advance is fitted in the boss portion 71a in the axial direction, and then fitted in the boss portion 71b in the axial direction, so that field coil winding can be realized. The magnetic coil winding process can be greatly improved. In the conventional Landell structure, the cutting surfaces (contact surfaces) of the bosses of the two half cores do not have irregularities in the axial direction at the circumferential magnetic pole pitch, so that the advantages of this embodiment can be realized. Can not.

(Modification)
In each of the above embodiments, a cylindrical nonmagnetic ring is disposed on the radially outer side of the circumferentially extending portion 91 of the first field coil 9 protruding in the axial direction from the magnetic salient pole portion 72, and this nonmagnetic ring is You may fix to the rotating shaft or the magnetic salient pole part 72. The nonmagnetic ring may be a cylinder made of an aluminum alloy, for example. In this way, the centrifugal force applied to the circumferentially extending portion 91 of the first field coil 9 can be carried by the magnetic salient pole portion 72 and the rotating shaft 6 through this nonmagnetic ring, so that high-speed rotation performance can be achieved. Can be improved. In addition, since this metal nonmagnetic ring is arrange | positioned at the radial inside of the coil end of a stator coil, eddy current loss is small.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an axial sectional view showing the overall structure of a vehicle AC generator having a tandem rotor structure according to a first embodiment. It is a circuit diagram which shows a field current control circuit. 3 is a timing chart of the circuit of FIG. FIG. 2 is a development view taken along line AA in FIG. 1. It is the front view which looked at the 1st rotor of Drawing 1 in the direction of an axis. It is an axial sectional view showing the whole structure of a vehicular AC generator having a tandem rotor structure of a second embodiment. FIG. 7 is a development view taken along line AA in FIG. 6. It is the front view which looked at the 1st rotor of Drawing 6 in the direction of an axis. It is a circumferential direction expanded sectional view of the rotor core of a 3rd embodiment. FIG. 10 is a circumferential development of the rotor core of FIG. 9. FIG. 10 is an axial sectional view of the rotor core of FIG. 9. It is the circumferential direction expanded view which shows the division | segmentation rotor core of 4th Embodiment.

Explanation of symbols

C Inter-core gap S Magnetic pole gap S1 Control signal S2 Control signal V Voltage X Front end face Y Rear end face 1a Front housing 1b Center housing 1c Rear housing 1 Housing 2 Stator core 3 Stator core 4 Stator coil 5 Stator coil 6 Rotating shaft 7 Rotor core 8 Rotor core DESCRIPTION OF SYMBOLS 9 Field coil 10 Field coil 11 Pulley 12 Slip ring 13 Slip ring 14 Brush 15 Brush 16 Regulator 17-20 Transistor 21-24 Diode 31 Centrifugal cooling fan 32 Centrifugal cooling fan 33 Centrifugal blade 34 Centrifugal blade 71 Boss part 71a Boss part 71b Boss part 72 Boss part 72 Magnetic salient pole part 73 Through hole 74 Hook part 81 Boss part 82 Magnetic salient pole part 83 Through hole 91 Circumferential extension part 92 Gap extension part between magnetic poles 100 Cut surface 311 Ring plate part 3 12 Centrifugal blade 321 Ring plate portion 322 Centrifugal blade 711 Inner tube portion 712 Outer tube portion 713 Radial beam portion 721 End surface 722 End surface 723 Axial side surface

Claims (23)

A housing;
A rotating shaft rotatably supported on the housing;
A stator core fixed to the housing;
A stator coil wound around the stator core;
A rotor core having a predetermined number of magnetic poles sequentially arranged in the circumferential direction across a gap between predetermined magnetic poles extending at least in the axial direction and fixed to the rotating shaft;
A field coil wound around the rotor core and alternately magnetizing the magnetic poles in the circumferential direction;
A field coil power supply mechanism comprising a slip ring for supplying a field current supplied from the brush on the housing side to the field coil;
In a field coil type rotating electrical machine comprising:
The rotor core is
A boss portion, and a predetermined number of magnetic salient pole portions each projecting radially from the outer peripheral surface of the boss portion and constituting the magnetic pole,
The field coil is
A field coil type rotating electrical machine, wherein the field coil type rotating electrical machine is meandered between the magnetic pole gaps. In the field coil type rotating electrical machine according to claim 1,
Each of the rotor cores has the field coil and is arranged in a plurality of tandems with a predetermined inter-core gap in the axial direction on the same rotating shaft,
The field coil is a field coil type rotating electrical machine that is individually wound around each rotor core. In the field coil type rotating electrical machine according to claim 2,
The two rotor cores adjacent to each other in the axial direction have the magnetic salient pole portions at substantially the same position in the circumferential direction,
The field coil is formed by alternately connecting a gap extending portion between the cores passing through the gap between the cores and a circumferential extending portion extending in the circumferential direction along the end surface of the rotor core,
One of the circumferentially extending portions of the two field coils adjacent to each other in the axial direction is arranged at substantially the same position as the other circumferentially extending portion of the two field coils. Type rotating electric machine. In the field coil type rotating electrical machine according to claim 1,
The field coil is
An end surface on one end side in the axial direction of the odd-numbered magnetic salient pole portion, and a circumferentially extending portion extending in the circumferential direction adjacent to the end surface on the other end side in the axial direction of the even-numbered magnetic salient pole portion When,
A gap extending portion between the magnetic poles extending between the magnetic pole gaps and connecting the two circumferentially extending portions adjacent to each other in the circumferential direction;
Have
The magnetic salient pole part is
The end face close to the circumferential extension of the field coil is inclined at a predetermined angle with respect to the axial direction so that the end face of the field coil has a smaller circumferential length than the end face where the circumferential extension of the field coil is not close. Field coil type rotating electrical machine installed. In the field coil type rotating electrical machine according to claim 1,
The boss part is a field coil type rotating electrical machine having a through hole penetrating in the axial direction. In the field coil type rotating electrical machine according to claim 5,
The axial flow blade portion is a field coil type rotating electrical machine that feeds air between the core gaps of a tandem rotor core. In the field coil type rotating electrical machine according to claim 1,
A field coil type rotating electrical machine having a centrifugal blade that is fixed to an axial end face of the magnetic salient pole portion where the circumferentially extending portion of the field coil is not adjacent to each other and sends centrifugal air to the coil end of the stator coil . In the field coil type rotating electrical machine according to claim 1,
The rotor core is a field coil type rotating electrical machine that is an integral product. In the field coil type rotating electrical machine according to claim 1,
An end surface of the magnetic salient pole portion adjacent to the field coil is a field coil type rotating electrical machine having a hollow portion in which the field coil is accommodated. In the field coil type rotating electrical machine according to claim 9,
Of the field coils, a circumferentially extending portion extending in the circumferential direction is a field coil type rotating electrical machine that does not protrude outward in the axial direction from the recess. In the field coil type rotating electrical machine according to claim 1,
The magnetic salient pole part is a field coil type rotating electrical machine having a substantially constant magnetic path perpendicular direction cross-sectional area. In the field coil type rotating electrical machine according to claim 1,
The field coil type rotating electrical machine in which the magnetic salient pole section has a cross section perpendicular to the magnetic path perpendicular to the cross section of the boss section. In the field coil type rotating electrical machine according to claim 1,
The end face on the one end side in the axial direction of the odd-numbered magnetic salient poles not adjacent to the field coil is axially more than the end face on the one end side in the axial direction of the even-numbered magnetic salient poles adjacent to the field coil. It is arranged at a position shifted to one end side,
The end surface on the other end side in the axial direction of the even-numbered magnetic salient pole portion not adjacent to the field coil is more than the end surface on the other end side in the axial direction of the odd-numbered magnetic salient pole portion not adjacent to the field coil. A field coil type rotating electrical machine disposed at a position shifted toward the other end in the axial direction. The field coil type rotating electrical machine according to claim 13,
The field coil type rotating electrical machine in which the axially central portion of the boss portion of the rotor core has a larger radial length than the axial end portion of the boss portion. In the field coil type rotating electrical machine according to claim 1,
The field coil is a field coil type rotating electrical machine made of a rectangular wire. In the field coil type rotating electrical machine according to claim 1,
A field coil type rotating electrical machine having a power supply control circuit for performing intermittent power supply with a duty ratio of 20% or less to the field coil. The field coil type rotating electrical machine according to claim 16,
The feed control circuit is a field coil type rotating electrical machine having a flywheel diode that is installed closer to the field coil than the slip ring and allows a flywheel current to flow through the field coil. The field coil type rotating electrical machine according to claim 17,
The flywheel diode is a field coil type rotating electrical machine made of a Schottky barrier diode. In the field coil type rotating electrical machine according to claim 1,
An end surface of the magnetic salient pole portion that is in contact with a circumferentially extending portion of the field coil that extends in a substantially circumferential direction while being curved is chamfered along a curved shape of the circumferentially extending portion of the field coil. Field coil type rotating electrical machine. In the field coil type rotating electrical machine according to claim 1,
The rotor core is divided into two half cores by being broken along the gap between the magnetic poles at a substantially radial inner side of the field coil,
One of the two half cores is formed integrally with the odd number of the magnetic salient pole portions,
The other of the two half cores is formed integrally with the even-numbered magnetic salient pole portions,
The field coil is a field coil type rotating electrical machine that is molded in advance and interposed between the two half cores. In the field coil type rotating electrical machine according to claim 1,
An outer peripheral end portion of the magnetic salient pole portion has a flange that protrudes in a circumferential direction or an axial direction from a radially inner portion of the outer peripheral end portion and expands a magnetic pole surface facing the inner peripheral surface of the stator core. Magnetic coil type rotating electrical machine. The field coil type rotating electrical machine according to claim 20,
The portion of the flange adjacent to the outer side in the radial direction of the circumferentially extending portion that is a portion extending in the circumferential direction of the field coil protrudes longer than other portions of the flange. Coil type rotating electrical machine. A housing;
A rotating shaft rotatably supported on the housing;
A stator core fixed to the housing;
A stator coil wound around the stator core;
A rotor core having a predetermined number of magnetic poles sequentially arranged in the circumferential direction across a gap between predetermined magnetic poles extending at least in the axial direction and fixed to the rotating shaft;
A field coil wound around the rotor core and fixed to the rotor core to magnetize the magnetic poles alternately in the circumferential direction;
A field coil power supply mechanism comprising a slip ring for supplying a field current supplied from the brush on the housing side to the field coil;
In a field coil type rotating electrical machine comprising:
The rotor cores each have the field coil and are arranged in a pair of tandems with a predetermined inter-core gap in the axial direction on the same rotating shaft,
The field coils are individually wound around the pair of rotor cores,
The slip rings are arranged in a pair,
A first current direction determining diode is connected in series with one of the pair of field coils;
A second current direction determining diode is connected in series with the other of the pair of field coils;
The field coil power supply mechanism applies an AC voltage fed from a full bridge inverter circuit to the pair of field coils through the current direction determining diode.

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