JP2006197674A - Stator for three-phase rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator for three-phase rotary electric machine in which an armature coil can be constituted using a coil conductor of large diameter without causing increase in size and/or cost. <P>SOLUTION: Three unit coil groups Gu-Gw are constituted side by side in the circumferential direction of a stator core by winding unit coils L1, L2, ... constituting three phase coils 2u to 2w such that four unit coils having one ends being connected commonly are arranged sequentially in a region of the stator core C having a pole arc angle of 120° to constitute a unit coil group. Three connection conductors of bare conductor opposing the three unit coil groups, respectively, are arranged on one end side of the stator core C in the axial direction, one end of each unit coil constituting each unit coil group is connected directly with a corresponding connection conductor and the other ends of two unit coils constituting respective unit coil groups are connected through a crossover conductor of an insulation coated wire. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stator used in a three-phase rotating electrical machine such as a magnet-type three-phase AC generator.

  As a stator used in a three-phase rotating electrical machine such as a magnetic three-phase AC generator, a stator core having an annular yoke and 6n (n is an even number) teeth projecting radially from the annular yoke, and six teeth A coil provided with 6n coils each wound on a wire is used. In this type of stator, 6n coils are star-connected or delta-connected to form a three-phase armature coil.

  FIG. 1 shows, as an example, a 12-pole stator 1 used together with a 10-pole magnet rotor in an inner rotor type magnetic three-phase AC generator. The illustrated stator includes a yoke Y formed in an annular shape and twelve teeth T1 to T12 projecting radially inwardly from the inner periphery of the yoke Y and facing the magnetic poles of the rotor at the tips of the teeth. The stator core C has a magnetic pole portion to be formed, and unit coils L1 to L12 wound around the teeth T1 to T12, respectively.

  In the stator shown in FIG. 1, unit coils L1, L2, L7 and L8 constitute a U-phase phase coil, and unit coils L5, L6, L11 and L12 constitute a V-phase phase coil. The unit coils L3, L4, L9, and L10 constitute a W-phase coil. For example, as shown in FIG. 2, the U-phase to W-phase coils 2u to 2w are delta-connected to form a three-phase armature coil 2, and a common connection point between adjacent phase coils is set. Three-phase external terminals are derived from the three current collectors. That is, the common connection point between the U-phase coil 2u and the V-phase coil 2v, the common connection point between the V-phase coil 2v and the W-phase coil 2w, and the W-phase coil 2w and the U-phase The U, V, and W3 phase external terminals are derived from the three current collectors 3u to 3w that respectively constitute a common connection point with the phase coil 2u.

  2, the unit coil indicated by the solid line is wound clockwise as viewed from the inside of the stator core shown in FIG. 1, and the unit coil indicated by the broken line is counterclockwise as viewed from the inside of the stator core shown in FIG. It is wound.

  In the example shown in FIG. 2, each phase coil is constituted by four unit coils connected in series. However, when a large current is passed through the armature coil, two unit coils connected in series with each other. The unit phase coil is configured by the above, and each unit phase coil is configured by connecting n unit phase coils in parallel. FIG. 3 shows an example. In this example, two unit coils L1 and L2 and unit coils L7 and L8 connected in series constitute unit phase coils 2u1 and 2u2, respectively, and these unit phase coils are connected in parallel to each other. Thus, the U-phase phase coil 2u is configured. Further, two unit coils L5 and L6 and unit coils L11 and L12 connected in series constitute unit phase coils 2v1 and 2v2, respectively, and these unit phase coils are connected in parallel to each other to form a V phase. Phase coil 2v is configured. Similarly, two unit coils L3 and L4 and unit coils L9 and L10 connected in series constitute unit phase coils 2w1 and 2w2, respectively, and these unit phase coils are connected in parallel to each other. A W-phase coil 2w is configured.

  As a coil conductor that constitutes each unit coil of the stator, a coil conductor having an appropriate cross-sectional area according to the magnitude of the energization current is used. When a coil conductor having a large cross-sectional area is used, it is difficult to form the coil conductor, so that it is difficult to wind a unit coil around each tooth through a narrow space between the teeth. In particular, it is almost impossible to wind a coil conductor having a large cross-sectional area around a stator core used in an inner rotor type three-phase rotating electric machine as shown in FIG.

  Therefore, when a coil is wound with a coil conductor having a large cross-sectional area, the stator core is separated from the yoke by using each tooth connected to the yoke through a coupling part (divided core). After the coil is wound around the teeth, the teeth are coupled to the yoke to assemble the stator core.

  FIGS. 4A to 4C are development views showing the U-phase to W-phase coils of the stator shown in FIG. 1 as viewed from the inside of the stator core. In this example, the unit coils L1 and L2 are continuously wound to constitute the unit phase coil 2u1, and the unit coils L7 and L8 are continuously wound to constitute the unit phase coil 2u2. The unit coils L5 and L6 are continuously wound to constitute the unit phase coil 2v1, and the unit coils L11 and L12 are continuously wound to constitute the unit phase coil 2v2. Further, the unit coils L3 and L4 are continuously wound to constitute the unit phase coil 2w1, and the unit coils L9 and L10 are continuously wound to constitute the unit phase coil 2w2.

  When a coil conductor having a large cross-sectional area is used, the unit coils adjacent to the two teeth separated from the yoke are continuously wound to form a unit phase coil, and then the two teeth around which the unit phase coil is wound are Connected to the yoke. After all the teeth around which the unit phase coils are wound are connected to the yoke, the unit phase coils of each phase are connected in a state of matching polarities to form an armature coil as shown in FIG. . This type of stator is disclosed in Patent Document 1, for example.

In FIG. 4 (A), the reference numerals U to W before the parentheses in the reference numerals attached to both ends of each unit phase coil indicate the current collectors 3u to 3w whose terminals are U phase to W phase. This indicates that the terminal is connected to. Further, (U +), (V +) and (W +) indicate the start of winding of the U-phase coil, the V-phase coil and the W-phase coil, respectively (U−), (V−) and (W−). ) Indicate the end of winding of the U-phase coil, the V-phase coil, and the W-phase coil, respectively. For example, W (U +) indicates a terminal connected to the W-phase current collector 3w and at the same time the winding start of the U-phase coil, and U (U−) indicates the U-phase current collector 3u. It shows that it is not only the terminal to be connected but also the end of winding of the U-phase coil. In the example of FIG. 4A, the terminals W (U +) of the unit phase coils 2u1 and 2u2 and the terminals U (U−) of the unit phase coils 2u1 and 2u2 are connected to each other to form a U-phase phase coil 2u. Is done. The meanings of the reference numerals attached to both ends of the unit phase coil shown in FIGS. 4B and 4C are also the same, and between the terminals of the same phase of adjacent phase coils, for example, U (U−) A three-phase armature coil is configured by connecting between U (U +), between V (V−) and V (W +), and between W (U +) and W (W−). .
JP 2002-34190 A

  In the stator shown in FIG. 3 and FIG. 4, a transition conductor that connects between unit coils wound around adjacent teeth, for example, a transition conductor that connects between U (U−) and U (U +). Since the current flowing through the armature coil is large, there is a problem in that it becomes difficult to form a transition conductor having a large diameter.

  Therefore, it is conceivable to connect the terminal portion of each unit phase coil and the current collector portion via a bus bar (a connecting conductor made of a bare conductive plate) disposed at one end of the stator core in the axial direction. However, when each unit phase coil is configured as shown in FIGS. 3 and 4, it is inevitable that a plurality of bus bars overlap each other in the axial direction of the stator core. Since the bus bar is made of a bare conductor, it is necessary to insert an insulating spacer between the overlapping bus bars at a location where a plurality of bus bars overlap, which increases the axial dimension of the stator and increases the size of the stator. Problems arise.

  In addition, when a current flowing through the armature coil is particularly large and a coil conductor having a particularly large diameter is used, for example, when a coil conductor having a diameter of 1.5 mm or more is used, the molding becomes very difficult. As shown in the above, it becomes difficult to continuously wind the coil around the two teeth. In this case, it is conceivable that after connecting each tooth around which the unit coil is wound to the yoke without continuously winding two adjacent unit coils, all the connection points are connected by the bus bar. In this case, the number of bus bars is remarkably increased, so that the structure in the vicinity of the end portion in the axial direction of the stator is complicated and the cost is increased, and the axial dimension of the stator is increased, so that the stator Is inevitable to increase in size.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stator core for a three-phase rotating electrical machine in which an armature coil can be configured using a coil conductor having a large diameter without causing an increase in size or an increase in cost. It is to provide.

  The present invention relates to a stator used in a three-phase rotating electrical machine. In the stator targeted by the present invention, an annular yoke is connected to the annular yoke via a separable connecting portion, and the like. There are provided 6n pole stator cores having 6n (n is an even number) teeth projecting radially at angular intervals, and 6n unit coils wound around 6n teeth of the stator core. The unit coil is divided into three phase coils, and the three phase coils are delta-connected to form a three-phase armature coil. Each phase coil has a configuration in which n unit phase coils composed of two unit coils connected in series with each other are connected in parallel, and three groups that constitute a common connection point of adjacent phase coils of the armature coil. Three-phase external terminals are drawn out from the electric parts, respectively.

  In the present invention, 2n unit coils having one terminal connected to each current collector are sequentially arranged in a region having a polar arc angle of 120 degrees of the stator core to constitute one unit coil group. The unit coils constituting the three phase coils are wound to form three unit coil groups arranged in the circumferential direction of the stator core, and one terminal portion of each unit coil constituting each unit coil group is the axis of the stator core Derived to one end side in the direction. Also, three connecting conductors made of bare conductors facing the three unit coil groups are arranged on one end side in the axial direction of the stator core, and one terminal portion of each unit coil constituting each unit coil group corresponds. The other end portions of the two unit coils constituting each unit phase coil are connected through a transition conductor made of an insulation-coated electric wire.

  As described above, a series of unit coils in which one terminal portion is commonly connected to each current collecting portion of the three-phase armature coils to be delta-connected are sequentially arranged in the circumferential direction of the stator core to constitute one unit coil group The unit coils constituting each phase coil are wound so as to form three unit coil groups arranged along the circumferential direction of the stator core, and on one end side in the axial direction of the stator core, respectively, facing the three unit coil groups. A configuration in which three connection conductors composed of bare conductors are arranged, and one terminal portion of each unit coil constituting each unit coil group led to one end side in the axial direction of the stator core is connected to the corresponding connection conductor; Then, only three connection conductors need be provided, and the three connection conductors can be arranged without being in electrical contact with each other. Need to insert a chromatography support is eliminated. Therefore, it is possible to prevent the axial dimension of the stator from becoming large and the stator from becoming large, or a large number of connecting conductors from being required to increase the cost.

  Moreover, since it becomes long as the distance between the terminal parts of the unit coil connected by a connecting wire becomes long when it is comprised as mentioned above, even when it is necessary to use a thing with a large diameter as a connecting wire, of the electric wire which comprises a connecting wire Molding can be facilitated. Therefore, it is possible to facilitate the manufacture of a stator that requires a large current to flow through each phase coil.

  A typical stator for a rotating electrical machine to which the present invention is applied is an annular yoke and twelve pieces projecting radially from the yoke at equal angular intervals connected to the annular yoke through a separable connecting portion. And a 12-pole stator core used with a 10-pole rotor (when n = 2). This type of stator is often used to construct a magnet type three-phase AC generator attached by an internal combustion engine.

  When a 12-pole stator core as described above is used, in a preferred aspect of the present invention, the region in which four unit coils whose one end is connected to each current collector has a polar arc angle of 120 degrees of the stator core. The unit coils constituting the three phase coils are wound so as to constitute one unit coil group arranged in sequence, and three unit coil groups arranged in the circumferential direction of the stator core are formed. One terminal portion of each of the four unit coils that are configured is led out to one end side in the axial direction of the stator core.

  Then, three connection conductors made up of bare conductors respectively opposed to the three unit coil groups are arranged on one end side in the axial direction of the stator core, and one terminal portion of each unit coil constituting each unit coil group corresponds to each other. The other terminal portions of the two unit coils constituting each unit phase coil are directly connected to each other through a crossover conductor made of an insulation-coated wire.

  As each of the connection conductors described above, a conductor plate that is formed to have an arc shape and is arranged in a state where the plate surface is orthogonal to the axis of the stator core is used. It is preferable to arrange the plate surfaces in a state where they are located on the same plane.

  In this case, the transition conductor is preferably disposed between the three connection conductors and the coil end on one end side in the axial direction of the stator core.

  As described above, according to the present invention, the unit coils in which one terminal portion is commonly connected to each current collecting portion of the three-phase armature coils to be delta-connected are sequentially arranged in the circumferential direction of the stator core to form one unit. A unit coil constituting each phase coil is wound so as to constitute a coil group to constitute three unit coil groups arranged along the circumferential direction of the stator core, and three units on one end side in the axial direction of the stator core. Three connection conductors made of bare conductors facing each coil group are arranged, and one terminal portion of each unit coil group constituting each unit coil group led to one end side in the axial direction of the stator core corresponds to the corresponding connection conductor. Since the three connecting conductors can be arranged without being brought into electrical contact with each other, it is only necessary to provide three connecting conductors. DOO DOO can and the need to insert an insulation spacer between the connection conductors each other no longer it coupled with, simplifying the construction of the axial ends of the stator. Therefore, according to the present invention, it is possible to prevent the axial dimension of the stator from becoming large and the stator from becoming large, and a large number of connecting conductors from being required, resulting in an increase in cost.

  Further, according to the present invention, since the distance between the terminal portions of the unit coils connected by the jumper wire becomes long, even when it is necessary to use a large wire as the jumper wire, the forming of the electric wire constituting the jumper wire This makes it easy to install the crossover. Therefore, it is possible to facilitate the manufacture of a stator that requires a large current to flow through each phase coil.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
The present invention can be applied to a stator for a rotating electrical machine in which coils are concentratedly wound around each tooth using a 6n-pole stator core having 6n (n is an even number) teeth. The 6n-pole stator is used with an even-numbered rotor of 4 poles or more. The number of poles of the stator may be equal to the number of poles of the rotor, but particularly in an electric motor, the number of magnetic poles of the rotor field may be different from the number of poles of the stator core in order to reduce cogging torque. For example, in a three-phase brushless motor using a rotor having a magnet field, when a 12-pole stator core is used, if a rotor having a 10-pole magnet field is used, output can be secured while reducing cogging torque. The output and the cogging torque can be balanced. In this embodiment, a 12-pole stator having 12 teeth is used.

  FIG. 5 shows an example of a configuration when the present invention is applied to a 12-pole stator 1 used with a 10-pole magnet rotor in an inner rotor type magnetic three-phase AC generator.

  The stator shown in FIG. 5 includes a yoke Y formed in an annular shape and twelve teeth T1 to T12 projecting radially inward from the inner periphery of the yoke Y, and is not shown at the tip of each tooth. It comprises a stator core C having a magnetic pole portion opposed to a magnetic pole of a rotor (for example, a magnet rotor), and unit coils L1 to L12 wound around teeth T1 to T12, respectively. Each tooth has a pigtail-shaped male coupling portion Ta on the rear end side, and this coupling portion is fitted into a female coupling portion Ya formed of a pigeon-shaped groove formed in the yoke Y. Thus, the yoke Y is connected in a separable state.

  The stator 1 shown in FIG. 5 is shown to have the same configuration as that of the conventional stator shown in FIG. 1, but in the stator shown in FIG. A unit coil is wound for each tooth without continuous winding. Each tooth around which the unit coil is wound is attached to the yoke Y in a state in which one end portion and the other end portion of the wound unit coil are both led out to one end side in the axial direction of the stator core C.

  In the stator shown in FIG. 5, unit coils L1, L2, L7 and L8 constitute a U-phase phase coil, and unit coils L5, L6, L11 and L12 constitute a V-phase phase coil. The unit coils L3, L4, L9, and L10 constitute a W-phase coil.

  In the present embodiment, as shown in FIG. 6, two unit coils L1 and L8 and unit coils L2 and L7 connected in series constitute unit phase coils 2u1 and 2u2, respectively. The phase coils 2u are configured by connecting the phase coils in parallel to each other. Two unit coils L5 and L12 and unit coils L6 and L11 connected in series constitute unit phase coils 2v1 and 2v2, respectively, and these unit phase coils are connected in parallel to each other to form a V phase. Phase coil 2v is configured. Further, two unit coils L3 and L10 and unit coils L4 and L9 connected in series constitute unit phase coils 2w1 and 2w2, respectively, and these unit phase coils are connected in parallel to each other to form a V phase. Phase coil 2w is configured. These three phase coils 2u to 2w are delta-connected to form a three-phase armature coil 2, and three current collectors 3u to 3w constituting a common connection point of adjacent phase coils respectively An external terminal is derived.

  In the present invention, 2n (n = 2 in the illustrated example) unit coils, each having one terminal connected to each current collector, are sequentially arranged in a region having a 120 ° polar arc angle of the stator core. The unit coils constituting each of the three phase coils 2u, 2v and 2w are wound so as to constitute one unit coil group, thereby constituting three unit coil groups arranged in the circumferential direction of the stator core.

  In the present invention, each unit phase coil is constituted by two unit coils (unit coils for inducing a voltage of the same phase) that are arranged at a sufficiently large angular interval (mechanical angle) and connected in series with each other. As described above, the winding direction of the unit coils constituting each unit phase coil and the combination of the two unit coils constituting each unit phase coil are determined. In the illustrated example, the unit constituting each unit phase coil is configured such that each unit phase coil is constituted by connecting two unit coils arranged in series at a mechanical angle close to 180 °. Coil combinations are defined. For example, the phase coil 2u is composed of unit coils L1, L2, L3 and L4. In this case, the unit coils constituting the unit phase coil 2u1 are not a combination of L1 and L2, but L1 and L8. Are combined.

  In FIG. 6, the unit coil indicated by the solid line is wound clockwise as viewed from the inside of the stator core, and the unit coil indicated by the wavy line is wound counterclockwise as viewed from the inside of the stator core.

  In this embodiment, the combination of unit coils constituting each unit phase coil is different from the conventional example shown in FIG. 2, but for the sake of convenience, reference numerals indicating each unit phase coil and reference numerals indicating each phase coil are shown in FIG. The same as shown in the above is used.

  FIGS. 7A to 7C are development views showing the U-phase to W-phase coils of the stator shown in FIG. 5 as viewed from the inside of the stator core, and the unit coil wound around each tooth is shown in FIG. It arrange | positions in the state which led out the terminal part of both ends to the one end side (upper side in FIG. 7) of the axial direction of a stator core.

  In the present embodiment, four unit coils having one terminal connected to each current collector are sequentially arranged in a region having a 120 ° polar arc angle of the stator core so as to constitute one unit coil group. The unit coils constituting the three phase coils 2u to 2w are wound to form three unit coil groups arranged in the circumferential direction of the stator core. In this embodiment, as shown in FIG. 5, the four unit coils L1 to L4 whose one end is connected to the current collector 3w are sequentially arranged in a region having a polar arc angle of 120 degrees of the stator core. One unit coil group Gw is formed side by side, and four unit coils L5 to L8, one end of which is connected to the current collector 3u, are sequentially arranged in a region having a 120 ° polar arc angle of the stator core. One unit coil group Gu is configured. Further, four unit coils L9 to L12 whose one end is connected to the current collector 3v are sequentially arranged in a region having a polar arc angle of 120 degrees of the stator core to constitute one unit coil group Gv.

  As shown in FIG. 9, three connection conductors 11 to 13 made of bare conductors are arranged on one end side in the axial direction of the stator core C and face the coil ends of the three unit coil groups Gu to Gw, respectively. In addition, one terminal portion of each unit coil constituting each unit coil group is directly connected to the corresponding connection conductor, and the other terminal portion of the two unit coils constituting each unit phase coil is insulated from the insulated wire. Connected through a crossover conductor.

  The connecting conductors 11 to 13 shown in the figure are made of arc-shaped conductive plates having a predetermined thickness, and the polar arc angle of the arc of each connecting conductor is set slightly smaller than 120 °. The three connection conductors 11 to 13 are in contact with each other at a position facing the coil end on one end side in the axial direction of the stator core C in a state where one plate surface of each of the connection conductors 11 to 13 is located on the same plane. In such a manner, they are arranged side by side in the circumferential direction of the stator core.

  More specifically, one end portions L1a to L4a of the unit coils L1 to L4 are inserted into holes provided in the connection conductors 11 arranged to face the coil ends of these unit coils and brazed. The terminal portions L5a to L8a of the unit coils L5 to L8 are directly connected to the connection conductor 11 by means of, for example, and inserted into holes provided in the connection conductor 12 arranged so as to face the coil ends of these unit coils. Then, it is directly connected to the connection conductor 12 by brazing or the like. One end portions L9a to L12a of the unit coils L9 to L12 are inserted into holes provided in the connection conductors 13 disposed so as to face the coil ends of these unit coils, and are connected to the connection conductors 13 by brazing or the like. Connected directly to. In FIG. 9, the portion indicated by a black circle indicates a portion to which one terminal portion of each unit coil is connected.

  Also, as shown in FIGS. 7A and 8, the other terminal portion L2b of the unit coil L2 and the other terminal portion L7b of the unit coil L7 are connected through the crossing conductor 21, and the unit coil L1 The other terminal portion L1b and the other terminal portion L8b of the unit coil L8 are connected through a bridge conductor 22. Further, as shown in FIGS. 7B and 8, the other terminal portion L6b of the unit coil L6 and the other terminal portion L11b of the unit coil L11 are connected through the crossing conductor 23, and the unit coil L5. The other end portion L5b of the unit coil L12 and the other end portion L12b of the unit coil L12 are connected through a bridge conductor 24. Further, as shown in FIGS. 7C and 8, the other terminal portion L4b of the unit coil L4 and the other terminal portion L9b of the unit coil L9 are connected through the crossing conductor 25, and the unit coil L3 is connected. The other terminal portion L3b and the other terminal portion L10b of the unit coil L10 are connected through a crossing conductor 26.

  The transition conductors 21 to 26 are made of an insulation-coated electric wire made of a solid conductor having a core wire having a predetermined diameter (substantially the same diameter as the coil conductor) formed into an arc shape along the circumferential direction of the stator core, As shown in FIG. 9, the connection conductors 11 to 13 and the stator core C are disposed so as not to protrude from the outer periphery of the yoke Y of the stator core C between the coil ends on one axial end side of the stator core C. ing. In the present invention, a combination of unit coils constituting each unit phase coil is determined so that two unit coils connected to each other via a crossing conductor are arranged at a sufficiently large angle. Therefore, even when the diameter of the transition conductor is large, it is possible to easily form each transition conductor.

  As is apparent from FIGS. 5 and 9, in the present invention, all unit coils whose one end portion is commonly connected to each current collecting portion of the three-phase armature coil 2 to be delta-connected are the stator core C. Three unit coil groups Gu to Gw arranged in the circumferential direction of the stator core C are formed by winding unit coils constituting each phase coil so as to constitute one unit coil group sequentially arranged in the circumferential direction. Each of the unit coil groups led out to one end side in the axial direction of the stator core by disposing three connection conductors 11 to 13 made of bare conductors respectively facing the three unit coil groups on one end side in the axial direction of the stator core C. By connecting one terminal portion of each of the unit coils that constitutes the corresponding connecting conductor, the three connecting conductors are arranged without being in electrical contact with each other. It is. With this configuration, only three connection conductors need be provided, and since it is not necessary to insert an insulating spacer between the connection conductors, the configuration of the axial end portion of the stator can be simplified. Therefore, according to the present invention, it is possible to prevent the axial dimension of the stator from becoming large and the stator from becoming large, and a large number of connecting conductors from being required, resulting in an increase in cost.

  Further, in the present invention, since the distance between the terminal portions of the unit coils connected by the jumper wire becomes long, even when it is necessary to use a large wire as the jumper wire, the electric wire constituting the jumper wire is formed. The installation work of the crossover can be simplified. Therefore, it is possible to easily manufacture a stator that requires a large current to flow through the coils of each phase.

  In the above embodiment, a case where a stator core having 12 teeth is used is taken as an example. However, in the present invention, the number of teeth of the stator core is not limited to 12, and generally 6n (n is an even number). The present invention can be applied to the case where a stator core having teeth is used.

It is the front view which showed an example of the conventional stator for rotary electric machines. It is the circuit diagram which showed an example of the connection of the armature coil of the conventional stator for rotary electric machines. It is the circuit diagram which showed the other example of the connection of the armature coil of the conventional stator for rotary electric machines. (A) thru | or (C) are each the expanded view which showed the structure of the phase coil of the U phase thru | or W phase of the conventional stator shown in FIG. It is the front view which showed the structure of embodiment of this invention. It is the circuit diagram which showed the connection of the armature winding of the embodiment. (A) thru | or (C) are the expanded views which showed the structure of the phase coil of the U phase thru | or W phase of the stator of embodiment of FIG. 5, respectively. It is the circuit diagram which showed the electrical structure of the stator of the embodiment. It is the front view which showed schematically the external appearance seeing the stator of the embodiment from the edge part side of one axial direction of a stator core.

Explanation of symbols

1 Stator for rotating electrical machine 2 Armature coil 2u, 2v, 2w phase coil 2u1, 2u2, 2v1, 2v2, 2w1, 2w2 Unit phase coil L1 to L12 Unit coil 11 to 13 Connection conductor 21 to 26 Crossing conductor

Claims (4)

A 6n-pole stator core having an annular yoke and 6n (n is an even number) teeth that are connected to the annular yoke via a separable connecting portion and project radially from the yoke at equal angular intervals; 6n unit coils wound around 6n teeth of the stator core, respectively, and the 6n unit coils are divided into three phase coils, and the three phase coils are connected in a delta connection. Phase armature coils are configured, and each phase coil has a configuration in which n unit phase coils composed of two unit coils connected in series with each other are connected in parallel, and adjacent phase coils of the armature coils In a stator for a three-phase rotating electrical machine in which three-phase external terminals are drawn out from three current collectors that constitute a common connection point of
The three phase coils are arranged in such a manner that 2n unit coils having one terminal connected to each current collector are sequentially arranged in a region having a polar arc angle of 120 degrees of the stator core to form one unit coil group. The unit coils constituting the coil are wound to form three unit coil groups arranged in the circumferential direction of the stator core,
One terminal portion of each unit coil constituting each unit coil group is led to one end side in the axial direction of the stator core,
Three connection conductors made of bare conductors respectively opposed to the three unit coil groups are arranged on one end side in the axial direction of the stator core, and one terminal portion of each unit coil constituting each unit coil group Connected to the corresponding connecting conductor,
The other terminal portions of the two unit coils constituting each unit phase coil are connected to each other through a transition conductor made of an insulation-coated electric wire,
A stator for a three-phase rotating electrical machine. A 12-pole rotor is used with a 10-pole rotor having an annular yoke and 12 teeth that are connected to the annular yoke through a separable connecting portion and project radially from the yoke at equal angular intervals. A stator core and twelve unit coils wound around twelve teeth of the stator core, the twelve unit coils are divided into three phase coils, and the three phase coils are delta-connected. Thus, a three-phase armature coil is configured, and each phase coil has a configuration in which two unit phase coils composed of two unit coils connected in series with each other are connected in parallel. In a stator for a three-phase rotating electrical machine in which three-phase external terminals are drawn out from three current collectors constituting a common connection point of adjacent phase coils,
The three phase coils are arranged in such a manner that four unit coils having one terminal connected to each current collector are sequentially arranged in a region having a polar arc angle of 120 degrees of the stator core to form one unit coil group. A unit coil constituting the coil is wound to form three unit coil groups arranged in the circumferential direction of the stator core,
One terminal portion of each of the four unit coils constituting each unit coil group is led out to one end side in the axial direction of the stator core,
Three connection conductors made of bare conductors respectively opposed to the three unit coil groups are arranged on one end side in the axial direction of the stator core, and one terminal portion of each unit coil constituting each unit coil group Directly connected to the corresponding connecting conductor,
The other terminal portions of the two unit coils constituting each unit phase coil are connected to each other through a crossover conductor made of an insulation-coated electric wire,
A stator for a three-phase rotating electrical machine.   Each of the connection conductors is formed of a conductive plate that is formed to have an arc shape and has a plate surface orthogonal to the axis of the stator core, and each of the three connection conductors has one plate surface. The stator for a three-phase rotating electrical machine according to claim 1 or 2, wherein the stator is arranged in a state of being positioned on the same plane. The stator for a three-phase rotating electrical machine according to claim 3, wherein the transition conductor is disposed between the three connection conductors and a coil end on one end side in the axial direction of the stator core.

Images