WO2008150035A1

WO2008150035A1 - Rotating electric machine

Info

Publication number: WO2008150035A1
Application number: PCT/JP2008/060815
Authority: WO
Inventors: Yoshiyuki Hisamatsu
Original assignee: Toyota Jidosha Kabushiki Kaisha
Priority date: 2007-06-07
Filing date: 2008-06-06
Publication date: 2008-12-11
Also published as: JP2008306849A

Abstract

A rotating electric machine (1000) includes a stator (100) having coil phases (110U, 110V, 110W) and also includes a rotor (10) having magnetic poles that are arranged at equal intervals and facing the stator (100). Each magnetic pole is defined by magnet groups (30A, 30B, 30C) including permanent magnets (31A, 31B, 31C). The crossing angle between an imaginary line that interconnects an circumferential end of a magnet group (30A) located in the circumferential direction of the rotor (10) and the center (O) of the rotor (10) and an imaginary reference line (L) that is perpendicular to the center line (P1A) of the magnetic pole of the magnet group (30A) and passes through the center (O) of the rotor (10) is not less than 70.00 degrees but not more than 72.50 degrees.

Description

Technical specification

The present invention relates to a rotating electrical machine, and more particularly, to a rotating electrical machine in which noise is reduced. Background art

Conventionally, motors have been designed to reduce noise, reduce size, and improve drive efficiency.

For example, in the permanent magnet type rotating electric machine described in Japanese Patent Application Laid-Open No. 2 00 3-6 9 4 2 2, the angle (polar arc degree) of two points on the outer peripheral side of each permanent magnet of the rotor is electrically Driving efficiency is improved by setting the angle to 96 degrees.

Further, in the synchronous motor described in Japanese Patent Application Laid-Open No. 7-255551A, permanent magnets are not arranged at equally divided positions, but are shifted back and forth by 30 degrees in electrical angle. It is arranged at the position. By arranging the permanent magnets in this way, the back electromotive force generated in the coil is brought close to a sine wave, and control characteristics and efficiency are improved. In the permanent magnet type rotating electrical machine described in Japanese Patent Application Laid-Open No. 1 1 1 2 9 9 1 99, the angle formed by the circumferential width of the outer peripheral surface of the stator side of each permanent magnet and the axis of the rotor is determined. The cogging torque is reduced by setting the angle to a predetermined value.

In the permanent magnet rotating electrical machine described in Japanese Patent Laid-Open No. 2 0 1-1 1 2 2 0 2, the circumferential length on the stator side of the permanent magnet is set to a predetermined length to induce The peak value of the induced voltage is suppressed by approximating the voltage waveform to a sine wave. In the permanent magnet type synchronous motor described in Japanese Patent Laid-Open No. 2 0 1-2 5 1 8 2 5, the magnet shaft center opening is set to a predetermined angle in terms of electrical angle, and the width of the slot opening is set to a predetermined value. Within the range, the motor efficiency is improved.

However, it is very difficult to accurately approximate the back electromotive force generated in the coil to a sine wave. None of the above conventional rotating electrical machines pay attention to the relationship between the frequency components of a specific order when the counter electromotive voltage is frequency-resolved and the noise generated in the rotating electrical machines. In other words, in order to reduce noise of a specific order that greatly contributes to noise reduction, There is no mention or suggestion in any prior literature of reducing the back electromotive force of a specific order that is correlated with this specific order of noise.

For this reason, in the method proposed in the above prior art document, there are cases where noise generated in the rotating electrical machine cannot be sufficiently reduced.

Disclosure of the invention

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rotating electrical machine in which noise is reduced by reducing a counter electromotive voltage of a specific order. It is.

A rotating electrical machine according to the present invention includes a stator tooth formed at an interval and projecting radially inward, a stator defined between the stator teeth, and a slot in which a coil is housed. A plurality of magnetic poles arranged at equal intervals, and a rotor facing the stator. And each said magnetic pole is prescribed | regulated by the magnet group containing a some permanent magnet, The virtual straight line which connects the circumferential direction edge part of each said magnet group, and the center of the said rotor, The centerline of the said magnetic pole of the said magnet group The crossing angle defined by a virtual reference line that is orthogonal to the rotor and passes through the center of the rotor is set to be not less than 70.0 degrees and not more than 72.5 degrees. Further, when the center line of the magnetic pole coincides with the center line of the stator teeth, the virtual straight line passes through the slot. Preferably, the crossing angle is set to 71.0 ° or more and 71.5 ° or less.

Preferably, the crossing angle is set to 7 1.2 5 degrees. Preferably, the magnet group includes a first permanent magnet located on a center line of the magnetic pole, and second and third permanent magnets arranged symmetrically across the center line of the magnetic pole.

Preferably, the second and third permanent magnets are inclined so that a distance between the second permanent magnet and the third permanent magnet becomes smaller inward in the radial direction of the rotor. Arranged.

It is planned from the beginning of the application to combine the above-mentioned configurations appropriately.

According to the rotating electrical machine of the present invention, it is possible to reduce noise by reducing the back electromotive voltage of a specific order.

Brief Description of Drawings FIG. 1 is a partial cross-sectional view of a rotating electrical machine according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a part of the rotating electrical machine shown in FIG.

Fig. 3 is a plan view of the stator.

Fig. 4 is a graph showing the rotation angle of the rotor (unit: electrical angle) on the horizontal axis and the back electromotive force (V) generated on each coil on the vertical axis.

Fig. 5 shows the frequency components of the counter electromotive voltage generated in the rotating electrical machine set to various crossing angles θ 1 shown in Fig. 2, and the 5th, 7th, 1 1st, 1 3rd order components of the back electromotive voltage. It is a graph which shows.

FIG. 6 is a cross-sectional view of the rotating electrical machine when the crossing angle 01 is 70.0 degrees. FIG. 7 is a cross-sectional view of the rotating electrical machine when the intersection angle Θ 1 is 72.5 °. In FIG. 8, the horizontal axis shows the crossing angle θ 1 of the rotating electrical machine, and the vertical axis shows the fifth-order component of the back electromotive voltage.

In FIG. 9, the horizontal axis represents the crossing angle θ 1 of the rotating electrical machine, and the vertical axis represents the seventh-order component of the back electromotive voltage.

In FIG. 10, the horizontal axis represents the crossing angle θ 1 of the rotating electrical machine, and the horizontal axis is a graph illustrating the 11th-order component of the back electromotive voltage.

BEST MODE FOR CARRYING OUT THE INVENTION

A rotating electrical machine according to the present embodiment will be described with reference to FIGS. In the embodiment described below, when referring to the number, amount, etc., the scope of the present invention is not necessarily limited to the number, amount, etc., unless otherwise specified. In the following embodiments, each component is not necessarily essential to the present invention unless otherwise specified.

FIG. 1 is a cross-sectional view of a part of a rotating electrical machine 100 according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a part of the rotating electrical machine 100 0 shown in FIG. is there. As shown in FIG. 1 and FIG. 2, the rotating electrical machine 1 00 0 has a U-phase coil (coiled phase) 1 1 0 U formed by distributed winding, a V-phase coil 1 1 0 V, Peripheral surface having a stator 1 0 0 having a W-phase coil 1 1 0 W and a plurality of magnet groups 30 A to 30 C defining a plurality of magnetic poles and facing the stator 1 0 0 A rotor 10 having 1 3. The stator 100 has an annular core body 103, for example, a plurality of magnetic steel plates. It is composed of layers. A plurality of stator teeth 101 projecting inward in the radial direction is formed on the inner peripheral surface of the core body 103. Slots (concave portions) 102 are formed between the stator teeth 101, and each slot 102 opens toward the inner peripheral side of the core body 103.

Stator teeth 101 are wound with U-phase coil 1 10 U, V-phase coil 1 10 V, and W-phase coil 1 10 W as winding phases by distributed winding. The U-phase coil 110U is located closest to the outer periphery of the core body 103, and the V-phase coil 110V is located radially inward from the U-phase coil 110U. The W-phase coil 1 1 OW is located radially inward with respect to the V-phase coil 1 1 OV. In the example shown in FIG. 1, each coil is wound directly around the stator teeth 101. Alternatively, for example, each coil may be mounted using an insulator. '

Each U-phase coil 1 10U, V-phase coil 1 10 V, and W-phase coil 1 10W wound in this way is supplied with AC power having a phase shift. This generates a magnetic flux that passes through each coinore 1 10U, 1 10V, 1 1 OW.

The rotor 10 includes an annular core body 20 formed by laminating electromagnetic steel plates made of iron or iron metal. The inside of the annular core body 20 is fixed to a cylindrical rotary shaft 130.

The rotor 10 includes a group of magnets 30 A, 30 B, 30 C each having a plurality of permanent magnets 3 1A, 32 A, 33 A, 3 1 B, 32 B, 33 B, 3 1 C, 32 C, 33 C. Is provided. A plurality of magnetic poles are formed on the rotor 10 by the magnet groups 30A, 30B, and 30C. The magnet groups 3 OA, 30 B, and 30 C are arranged at equal intervals in the circumferential direction of the rotor 10. For example, in Fig. 1, the smaller one of the crossing angles defined by the virtual straight line P 2 C and the virtual straight line P 2 A in the magnet group 3 OA is an electrical angle of 180 degrees. The machine angle is 45 degrees. The other magnet groups 30 B and 30 C are similarly arranged. In other words, the center lines P 1 A, P 1 B, and P 1 C of the adjacent magnet groups 3 OA, 30 B, and 30 C are arranged so as to be shifted from each other by 45 degrees in mechanical angle. Permanent magnets made of neodymium (Nd ₂ Fe ₁₄ B) constituting each magnet group 3 OA, 30 B, 30 C 31 A, 32 A, 33 A, 3 1 B, 32 B, 33 B, 31 C, 32 C The magnetic poles on the surface of the 33C stator 100 side are the same. For example, in FIG. 1, the magnetic poles on the surface on the stator 100 side of the permanent magnets 31 A, 32 A, 33 A constituting the magnet group 3 OA are N magnetic poles.

In addition, the magnetic poles on the stator 100 side of the magnet groups 3 OA, 30 B, and 30 C adjacent to each other in the circumferential direction of the rotor 10 are arranged to be different from each other, and are arranged so that the magnetic poles are alternately different in the circumferential direction. ing. For example, the magnetic pole on the stator 100 side of the magnet group 3 OA is an N pole, and the magnetic pole on the stator 100 side of the magnet group 30 B is an S pole. For this reason, magnetic poles having different polarities are formed at equal intervals in the circumferential direction on the surface of the rotor 10. Thus, since the magnetic poles are arranged on the circumferential surface of the rotor 10 at equal intervals, each magnetic pole (magnet group 30A, 30B, 30C) is pulled when being sequentially pulled by the magnetic poles generated in the coils of the stator 100. Variations in the suction force applied to the rotor 10 can be suppressed, and vibrations in the rotor 10 can be suppressed.

Each magnet group 3 OA, 30 B, 30C includes three permanent magnets. For this reason, the amount of magnetic flux generated from each magnet group 30A, 30B, 3OC is sufficiently secured, and a large torque can be generated.

1 and 2, center lines P 1A, P 1 B, and P 1 C passing through the centers of the magnetic poles are shown. Here, the center line P 1A passes through the center of the magnetic pole defined by the magnet group 3 OA and the center O of the rotor 10.

In FIG. 2, the permanent magnet (first permanent magnet) 33 A is accommodated in a magnet accommodation hole 43 A formed on the outer peripheral edge side of the rotor 10 and is located on the center line P 1 A. Yes. Permanent magnets (second and third permanent magnets) 3 1A and 32A are housed in magnet housing holes 41 A and 4 2 A 內 formed at positions adjacent to the permanent magnet 33 A in the circumferential direction of the rotor 10 Has been.

Here, the permanent magnets 31 A and 32 A are provided apart from each other in the circumferential direction of the rotor 10, and the permanent magnet 31 A and the permanent magnet 32 A are arranged in the radial direction of the rotor 10. It is inclined so as to approach each other. For this reason, in FIG. 1, the distance between the adjacent magnet groups 30A to 30C can be secured even on the radially inner side of the rotor 10, and the strength can be secured. Further, the distance between the permanent magnets 31A and 32A is secured on the outer peripheral side of the rotor 10, and even if the permanent magnet 33A is accommodated between the permanent magnets 31A and 32A, each permanent magnet 31A , 32 A, 33 A can be secured, and the rigidity of the rotor 10 can be secured.

Further, the permanent magnet 33 A is located on the magnetic pole center line P 1 A of the magnet group 3 OA. The other two permanent magnets 32 A and 33 A are arranged symmetrically with respect to the center line P I A. Thus, by arranging the permanent magnets 3 1 A, 32 A, and 33 A, the weight balance of the rotor 10 is ensured, and even when the rotor 10 rotates, vibrations generated in the rotor 10 are prevented. Can be reduced.

Here, the virtual straight line P 3 A is a straight line passing through the circumferential end QA of the magnet group 3 OA located in the circumferential direction of the rotor 10 and the center O of the rotor 10. The virtual reference line L of the magnet group 3 OA is a straight line passing through the center 0 of the rotor 10 and extending so as to be orthogonal to the center line PIA. The virtual reference line L passes through the center of the magnetic pole of the magnet group located on the opposite side of the magnet group 3 OA with respect to the magnet group 3 OB.

Passes through the center of the magnetic pole of the magnet group located on the opposite side of the magnet group 3 OA with respect to 30C. Of the crossing angles defined by the virtual straight line P 3 A and the virtual reference line L, the smaller crossing angle Θ 1 is set to a mechanical angle of 70.00 degrees or more and 72.50 degrees or less. .

In the rotating electrical machine 1000 according to the present embodiment, the intersection angle 03 between the extending direction of each permanent magnet 3 1 A, 31 B and the parallel reference line LA parallel to the virtual reference line L is, for example, a machine The angle ranges from 30 degrees to 40 degrees, and preferably 35 degrees. In the rotating electrical machine 1000 shown in FIGS. 1 and 2, the intersection angle S 3 is set to 35 degrees.

Fig. 3 is a plan view of the stator. Referring to FIG. 3, coils 510 to 5 1 7 constitute a U-phase coil 1 10U of stator coil 22, coils 520 to 527 constitute a V-phase coil 1 10 V of stator coil 22, and a coil 530 to 537 constitute a W phase coil 110W of the stator coil 22. Coinole 5 10 ~ 5 17, Each of 520 to 527 and 530 to 537 has a substantially arc shape.

The coils 510 to 517 are arranged on the outermost periphery. The coils 520 to 527 are disposed inside the coils 510 to 517, and are disposed at positions shifted by a certain distance in the circumferential direction with respect to the coils 510 to 517, respectively. The coils 530 to 537 are disposed inside the coils 520 to 527 and are respectively displaced from the coils 520 to 527 by a certain distance in the circumferential direction.

Each of the coils 5 10 to 51 7, 520 to 527, 530 to 537 is wound around each of a plurality of corresponding teeth. For example, the coin 510 corresponds to the teeth 1 to 5 and is formed by being wound around the entire teeth 1 to 5 a predetermined number of times from the outer periphery.

Coils 5 1 1 to 51 7, 520 to 527, and 530 to 537 are also formed on the corresponding teeth in the same manner as coil 510.

Coils 510 to 513 are connected in series, one end is a terminal U1, and the other end is a neutral point UN1. Coils 5 14 to 5 17 are connected in series, and one end is a terminal U 2 and the other end is a neutral point UN 2.

Coils 520 to 523 are connected in series, one end is a terminal V I and the other end is a neutral point VN 1. Coils 524 to 527 are connected in series, and one end is a terminal V 2 and the other end is a neutral point VN 2.

Coils 530 to 533 are connected in series, with one end being a terminal W1 and the other end being a neutral point WN1. Coils 534 to 537 are connected in series, and one end is a terminal W2 and the other end is a neutral point WN2.

Here, an alternating current with a phase shift is supplied to the coils 510 to 5 1 7, 520 to 527, and 530 to 537, thereby rotating the rotor 10 in a predetermined direction. At this time, by rotating the rotor 10, permanent magnets 31 A, 32 A, 33 A, 3 1 B, 32 B, 33 B, passing through the coils 510 to 51 7, 520 to 52 7, 530 to 537, 3 The amount of magnetic flux from 1 C, 32 C, and 33 C fluctuates.

For this reason, a counter electromotive voltage is generated in each of the coils 5 10 to 5 17, 520 to 527, and 530 to 537 by the rotation of the rotor 10.

In Fig. 4, the horizontal axis shows the rotation angle (unit: electrical angle) of the rotor 10, and the vertical axis 6 is a graph showing the counter electromotive voltage (V) generated in each coil 5 10 to 5 1 7, 5 2 0 to 5 2 7, and 5 3 0 to 5 3 7. Fig. 5 shows the frequency components of the counter electromotive voltage generated in the rotating electrical machine set at various crossing angles θ 1 shown in Fig. 2, and the 5th, 7th, 1 1st, 1 3rd order components of the back electromotive voltage are shown. It is a graph to show. In FIG. 5, the characteristics of the counter electromotive voltage shown at the right end of the graph are the characteristics of the rotating electrical machine as a comparative example. In the rotating electrical machine of this comparative example, each magnet group is composed of permanent magnets in which two permanent magnets are arranged in a V shape. For example, the rotating electrical machine of the comparative example has a permanent magnet 3 3 shown in FIG. It is a rotating electric machine with A, 3 3 B and 3 3 C removed.

Here, as shown in FIG. 4, the waveforms indicating the counter electromotive voltages generated in the respective coins 5 1 0 to 5 1 7, 5 2 0 to 5 2 7, 5 3 0 to 5 3 7 are overlapped with each other. Thus, the shape approximates a sine wave.

For example, the fifth component of the back electromotive voltage obtained by frequency decomposition of the back electromotive voltage wave shown in FIG. 4 has a frequency five times the frequency of the back electromotive voltage wave shown in FIG. It is a wave. Similarly, the 7th, 1 1st and 1 3rd order components are waves having frequencies 7 times, 11 times and 13 times the frequency of the back electromotive force wave shown in FIG.

Here, out of the noise generated in the rotating electrical machine 100, the order component of the least common multiple of the number of poles and the number of phases of the coil and the order component of the number of slots are large evaluation items. The rotating electrical machine 100 according to the present embodiment is an 8-pole 3-phase motor and has a number of openings of 48. Therefore, noise generated by driving the rotating electrical machine 100 Among them, the main evaluation item is to reduce the 2nd and 4th order components and the 48th order components. The 5th and 7th order components of the back electromotive voltage affect the 2nd and 4th order components of the noise, and the 1st and 1st order components of the back electromotive force and the 1st and 3rd order components affect the 4th and 8th order components of the noise. Sounds. In this embodiment, the angle in the width direction (circumferential direction of the rotor 10) of each slot 10 2 around the center O is 2.5 degrees (mechanical angle). The angle in the width direction of the stator teeth 100 around O is set to 5.0 degrees (mechanical angle).

Then, in FIG. 5, the counter electromotive voltage of the rotating electrical machine according to the present embodiment in which the crossing angle θ 1 shown in FIG. 2 is set to be not less than 70.0 ° (mechanical angle) and not more than 72.5 °. The total of the 5th, 7th, 1st, 1st, 3rd order components is smaller than the total of the rotating electrical machine of the comparative example I understand that. That is, it can be seen that the waveform of the counter electromotive voltage generated in the rotating electrical machine can be approximated to a sine wave, and noise generated in the rotating electrical machine can be reduced. When the crossing angle is larger than 72.5 °, the sum of the order components of the counter electromotive voltage becomes larger than the total of the rotating electrical machines of the comparative example. Here, FIG. 6 is a cross-sectional view of the rotating electrical machine when the crossing angle is 0 1 force 70.0 degrees. As shown in FIG. 6, when the center line P 1 A of the magnetic poles of the magnet group 3 OA is aligned with the center line of the stator teeth 10 0 1 A extending in the radial direction, Two teeth adjacent to each other in the circumferential direction 1 0 1 C, and the stator teeth 1 0 1 D located on the opposite side of the stator teeth 1 0 1 A with respect to this stator teeth 1 0 1 C The virtual straight line P 3 A passes through the slot 1 0 2 C. Specifically, the virtual straight line! ⁵ 3 A extends along the side surface of the stator teeth 1 0 1 D defining the slot 1 0 2 C. FIG. 7 is a cross-sectional view of the rotating electric machine when the crossing angle Θ1 is 72.5 °. As shown in FIG. 7, the virtual straight line P 3 A extends along the side surface of the stator teeth 1 0 1 C that defines the slot 1 0 2 C. In this way, when the crossing angle 0 1 is not less than 70.0 ° and not more than 72.5 °, the virtual straight line P 3 A passes through the slot 1 0 2 C, and the generated noise is removed from the magnet. The motor noise is smaller than that of a rotating electrical machine with a V-shaped arrangement that defines the magnetic pole.

In FIG. 8, the horizontal axis shows the crossing angle 0 1 of the rotating electrical machine, the vertical axis is a graph showing the fifth-order component of the back electromotive force, and FIG. 9 shows the crossing angle 0 1 of the rotating electrical machine, The vertical axis is a graph showing the 7th-order component of the back electromotive force. FIG. 10 is a graph in which the horizontal axis indicates the crossing angle 0 1 of the rotating electrical machine, and the horizontal axis indicates the first-order component of the back electromotive voltage.

Here, in FIGS. 8 to 10, the solid lines indicate the fifth-order component, seventh-order component, and first-order component of the back electromotive voltage of the rotating electrical machine as the comparative example.

Then, as shown in FIG. 8, the rotating electrical machine 1 00 0 0 according to the present embodiment is a comparative example at any crossing angle θ 1 of not less than 70.0 degrees and not more than 73.0 degrees. It can be seen that the fifth-order component of the back electromotive voltage is smaller than that of

As shown in FIG. 9, when the crossing angle 0 1 is in the range of 70.0 to 0.degree. It can be seen that the 7th-order component of the back electromotive force is smaller than that of the electric machine. As shown in FIG. 10, when the crossing angle Θ 1 is within the range of 70.00 degrees or more and 72.00 degrees or less, the rotating electrical machine 1000 according to the present embodiment has a counter electromotive voltage higher than that of the rotating electrical machine of the comparative example. It can be seen that the first-order component of is small.

The 13th-order component of the counter electromotive voltage generated in the rotating electrical machine 1000 according to the present embodiment is sufficiently smaller than the 13th-order component of the counter electromotive voltage 13 generated in the rotating electrical machine of the comparative example.

Here, as shown in FIGS. 8 to 10 above, when the crossing angle 0 1 is within the range of 70.00 degrees or more and 71.50 degrees or less, the rotating electrical machine 1000 is more reverse than the rotating electrical machine of the comparative example. It can be seen that the fifth-order, 1 1st-order, and 1 3rd-order components of the electromotive voltage are small, and the 7th-order component of the rotating electrical machine 1000 approximates the rotating electrical machine of the comparative example. For this reason, in the rotating electrical machine 1000 according to the present embodiment set to the intersection angle 61 as described above, any of the 24th-order component and 48th-order component of the generated noise occurs in the rotating electrical machine of the comparative example. It can be seen that it can be reduced from the 24th and 48th components. When the crossing angle 0 1 is larger than 71.50 degrees, the seventh-order component of the back electromotive voltage becomes larger than that of the rotating electric machine of the comparative example.

In addition, in rotating electrical machine 100 00 that is set to 7 1.00 degrees (mechanical angle) or more and 71.50 degrees or less, the first-order component of the back electromotive voltage is particularly small, and the 48th-order component of noise generated in rotating machine 1000 Can be particularly reduced. When the crossing angle 0 1 is smaller than 71.00 degrees, the 1st-order component of the back electromotive voltage increases, and when the crossing angle 0 1 is greater than 71.50 degrees, the 1st-order of the back electromotive voltage is increased. Ingredients become larger. Furthermore, as shown in Fig. 10, by setting the crossing angle 6 1 to 71.25 degrees, the first-order component of the back electromotive voltage can be minimized, and the 48th-order noise generated in the rotating electrical machine 1000 can be minimized. The component can be reduced. When the crossing angle 0 1 is 71.25 degrees, the virtual straight line P 3 A coincides with the center line of the slot 102 C extending in the radial direction as shown in FIG. At this time, as shown in FIG. 5, the sum of the components of each back electromotive voltage generated in the rotating electrical machine 1000 can be reduced, and the motor noise generated in the rotating electrical machine 1000 can be reduced. The results shown in FIGS. 4 to 10 are calculated by electromagnetic field simulation such as J1 MAG (manufactured by Japan Research Institute, Ltd.).

As described above, the embodiment of the present invention has been described. The embodiments should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

Industrial applicability

The present invention can be applied to a rotating electrical machine, and is particularly suitable for a rotating electrical machine in which noise is reduced.

Claims

The scope of the claims

1. A stator teeth (101) formed at an interval and projecting inward in the heel direction and a slot (102) defined between the stator teeth (101) and accommodating the coil A stator having,

A plurality of magnetic poles arranged at equal intervals, the rotor (10) facing the stator (100),

Each of the magnetic poles is defined by a magnet group (3 OA) including a plurality of permanent magnets (31A, 32 A, 33 A),

A virtual straight line (P 3A) connecting the circumferential end (QA) of each magnet group (3 OA) and the center (O) of the rotor (10), and the magnetic poles of the magnet group (3 OA) The crossing angle (θ 1) defined by the virtual reference line (L) perpendicular to the center line (P 1A) and passing through the center of the rotor (10) is 70.00 degrees or more and 72.50 degrees or less. When the center line (P 1A) of the magnetic pole coincides with the center line of the stator teeth (101), the virtual straight line passes through the slot (102).

2. The rotating electrical machine according to claim 1, wherein the intersection angle (θ1) is set to be not less than 71.00 degrees and not more than 7 1.50 degrees.

3. The rotating electrical machine according to claim 1, wherein the crossing angle (0 1) is 71.25 degrees.

4. The magnet group (3 OA) is arranged symmetrically across the first permanent magnet (33A) located on the magnetic pole center line (P 1A) and the magnetic pole center line (P 1A). The rotating electrical machine according to claim 1, further comprising second and third permanent magnets (31A, 32A).

5. The second and the second permanent magnets (31A) and the third permanent magnet (32A) are arranged such that a distance between the second permanent magnet (31A) and the third permanent magnet (32A) decreases toward the radially inner side of the rotor (10). The rotating electrical machine according to claim 4, wherein the third permanent magnet (3.1A, 32A) is disposed at an inclination.