A rotating motor

Abstract

The embodiment of the present invention discloses a rotating electric machine. The rotating electric machine includes a stator and a rotor; the rotor includes a rotating shaft and a magnetic pole fixed to the rotating shaft, and the radial outer surface of at least one of the magnetic poles is provided with a chamfer; the stator includes a stator core, and the stator core is located on the side of the magnetic pole away from the rotating shaft, and along the axial direction of the rotor, the chamfer overlaps with the stator core. The rotating electric machine provided by the embodiment of the present invention changes the harmonic magnetic resistance of the motor by providing a chamfer on the radial outer surface of the magnetic pole of the rotor, and the chamfer is provided to at least partially overlap with the stator core in the rotating shaft direction of the rotor, thereby reducing the air gap synthetic magnetic field of the motor, and further reducing the electromagnetic force of the motor, thereby achieving the purpose of reducing electromagnetic noise and improving user experience.

Description

Technical Field

[0001] The embodiments of the present invention relate to motor technology, and in particular to a rotating motor. Background Art

[0002] With the development and application of automobile technology, customers have higher and higher requirements for automobile NVH (Noise, Vibration, Harshness) and output performance. The sound of the engine is getting quieter and quieter, and vehicle manufacturers are becoming more and more demanding on the noise and output performance of automobile motors.

[0003] During the operation of the motor, the vibration caused by the electromagnetic force is transmitted through the motor body to the surrounding space, causing the particles in the air to vibrate and cause sound waves. When the frequency of the sound wave is between 20H and 20kHz, it can be heard by the human ear, which is electromagnetic noise.

[0004] In the related art, due to the influence of the motor's structure, the electromagnetic noise generated by the motor during operation is relatively large, which affects the user experience. Summary of the invention

[0005] An embodiment of the present invention provides a rotating electric machine to reduce electromagnetic noise of the electric machine.

[0006] An embodiment of the present invention provides a rotating electrical machine, comprising a stator and a rotor;

[0007] The rotor comprises a rotating shaft and magnetic poles fixed to the rotating shaft, wherein a radial outer surface of at least one of the magnetic poles is provided with a chamfer;

[0008] The stator comprises a stator core, and the stator core is located on a side of the magnetic pole away from the rotating shaft. Along the axial direction of the rotor, the chamfer overlaps with the stator core.

[0009] Optionally, the magnetic pole comprises at least one pole claw, and an outer surface of at least one of the pole claws is provided with a chamfered portion, and the chamfered portion forms at least one chamfer.

[0010] Optionally, the beveled portion is a curved surface or a smooth surface with a preset angle.

[0011] Optionally, the number of the magnetic poles is two;

[0012] All the pole claws of the two magnetic poles are provided with the chamfers; or, all the pole claws of one magnetic pole are provided with the chamfers; or, part of the pole claws of each of the two magnetic poles are provided with the chamfers; or, part of the pole claws of one magnetic pole are provided with the chamfers.

[0013] Optionally, at least one of the pole claws has one chamfer, one of the chamfers is a first chamfer, and the first chamfer is located at the claw root of the pole claw.

[0014] Optionally, at least one of the pole claws has two chamfers, namely a first chamfer and a second chamfer; wherein,

[0015] The second chamfer is located at the claw root of the pole claw;

[0016] The first chamfer is located in the claw or at the claw tip of the pole claw, and along the axial direction of the rotor, the first chamfer overlaps with the stator core.

[0017] Optionally, the first chamfer is connected to the second chamfer; or,

[0018] The first chamfer and the second chamfer have an arc-shaped transition portion.

[0019] Optionally, along the axial direction, the overlapping length between the first chamfer and the stator core satisfies the following relationship:

[0020] 0.01≤L2 / L1≤0.3 (1)

[0021] Wherein: L1 is the length of the stator core; L2 is the overlapping length of the first chamfer and the stator core.

[0022] Optionally, a preset angle is formed between the first chamfer and the stator core, and the preset angle satisfies the following relationship:

[0023] 1°≤α1≤30° (2)

[0024] Wherein: α1 is a preset angle between the first chamfer and the stator core.

[0025] Optionally, the rotor further includes an excitation coil wound around the rotating shaft, and the length of the excitation coil satisfies the following relationship:

[0026] 1.0≤L1 / L4≤1.1 (3)

[0027] Wherein: L1 is the length of the stator core; L4 is the length of the excitation coil.

[0028] The rotating motor provided in the embodiment of the present invention changes the harmonic magnetic resistance of the motor by arranging chamfers on the radial outer surfaces of the magnetic poles of the rotor, and arranging the chamfers to at least partially overlap with the stator core in the direction of the rotor's rotation axis, thereby reducing the air gap synthetic magnetic field of the motor and further reducing the electromagnetic force of the motor, thereby achieving the purpose of effectively reducing electromagnetic noise without affecting the overall structure of the motor and improving user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A cross-sectional view of a rotating electrical machine provided by an embodiment of the present invention;

[0030] Figure 2 for Figure 1 A cross-sectional view of the rotating electrical machine at another angle;

[0031] Figure 3 A cross-sectional view of another rotating electrical machine provided by an embodiment of the present invention;

[0032] Figure 4 A cross-sectional view of another rotating electrical machine provided by an embodiment of the present invention;

[0033] Figure 5 A curve diagram showing the variation of the output current with the length ratio of the excitation coil to the stator core provided in an embodiment of the present invention;

[0034] Figure 6 A curve diagram showing the variation of the electromagnetic noise of the motor provided by the embodiment of the present invention with the overlapping length of the chamfer and the stator core and the preset angle between the chamfer and the stator core. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] Figure 1 This is a cross-sectional view of a rotating electric machine provided by an embodiment of the present invention. The rotating electric machine provided by this embodiment can be applied to electric vehicles as a driving motor of the electric vehicles. Figure 1 , the rotating electrical machine comprises a stator and a rotor;

[0037] The rotor comprises a rotating shaft 11 and magnetic poles 12 fixed to the rotating shaft 11, and a radial outer surface of at least one of the magnetic poles 12 is provided with a chamfer 13;

[0038] The stator includes a stator core 21 . The stator core 21 is located on a side of the magnetic pole 12 away from the rotating shaft 11 . Along the axial direction of the rotor, the chamfer 13 overlaps with the stator core 21 .

[0039] Specifically, the axial direction of the rotor is the extending direction of the rotating shaft 11, corresponding to Figure 1 In the X direction, the radial direction of the rotor is perpendicular to the axial direction of the rotor, corresponding to Figure 1 in the Y direction.

[0040] The stator core 21 is provided with a plurality of equally spaced tooth slots, each having the same shape. The stator also includes a stator winding, which is wound in the tooth slots. In a three-phase or multi-phase motor, output is achieved by configuring three or more different stator windings.

[0041] By providing a chamfer 13 on the radial outer surface of the magnetic pole 12, and setting the chamfer 13 to at least partially overlap with the stator core 21 along the axial direction of the rotor, the magnetic permeability distribution of the motor is changed, thereby changing the magnetic density distribution, and ultimately reducing the electromagnetic force. In this way, when the motor is operating normally, the high-order harmonics generated by the motor are reduced, thereby reducing the vibration of the motor during operation, thereby reducing the electromagnetic noise of the motor, and achieving a noise reduction effect.

[0042] The principle by which the rotor structure of this embodiment can achieve noise reduction is further introduced below.

[0043] The main reason for the electromagnetic noise generated by the motor is the radial component of the air gap magnetic field acting on the stator core 21, which propagates outward through the yoke and causes the stator core 21 to vibrate and deform. The second is the tangential component of the air gap magnetic field, which is opposite to the electromagnetic torque and causes the core yoke to deform and vibrate.

[0044] Therefore, to reduce electromagnetic noise, it is necessary to reduce the electromagnetic force to reduce the vibration deformation of the stator core 21 and the core yoke.

[0045] According to the electromagnetic force principle formula:

[0046]

[0047] In the formula, F r is the electromagnetic force, B r The magnetic field is synthesized in the air gap.

[0048] It can be seen that when the air gap composite magnetic field decreases, the electromagnetic force decreases accordingly, so the electromagnetic force can be reduced by changing the composite magnetic field.

[0049] When the chamfer 13 overlaps with the stator core 21 along the axial direction of the rotor, the magnetic permeance distribution of the motor is changed, and the air gap synthetic magnetic field of the motor is reduced. Specifically:

[0050] According to the principle formula of air gap synthetic magnetic field:

[0051] B r (θ,t,z)=[F s (θ,t)+F f (θ,t,z)]·Λ(θ,t,z) (5)

[0052] In the formula, F s (θ,t) is the stator magnetomotive force, F f(θ, t, z) is the rotor magnetomotive force, and Λ(θ, t, z) is the magnetic permeance.

[0053] It can be seen from formula (5) that when the influence of the stator magnetomotive force and the rotor magnetomotive force on the magnetic flux density is constant, changing the magnetic permeance distribution can affect the magnetic flux density, so the magnetic flux density Br can be changed by changing the magnetic permeance Λ(θ, t, z).

[0054] This embodiment changes the radial outer surface of the rotor by setting a chamfer 13 on the radial outer surface of the magnetic pole 12, and sets the chamfer 13 to at least partially overlap with the stator core 21 along the axial direction of the rotor, thereby increasing the distance between the air gaps at both ends of the motor, thereby reducing the magnetic permeance of the corresponding parts, and finally changing the spatial distribution of the magnetic permeance of the air gap of the motor. According to the electromagnetic field simulation results, the rotating motor provided by this embodiment can suppress the high-order harmonics of the motor magnetic permeance, and under the action of the same stator magnetomotive force, the radial magnetic flux density of the motor can be reduced, thereby effectively reducing the amplitude of the high-order radial electromagnetic force of the motor, and finally achieving the noise reduction effect.

[0055] The rotary motor provided by the embodiment of the present invention, without changing the stator and rotor modes, changes the harmonic magnetic resistance of the motor by setting a chamfer on the radial outer surface of the magnetic pole of the rotor, and setting the chamfer to at least partially overlap with the stator core in the direction of the rotor's rotation axis, thereby reducing the air gap synthetic magnetic field of the motor, and further reducing the electromagnetic force of the motor, thereby achieving the purpose of reducing electromagnetic noise and improving user experience. At the same time, by setting the chamfer, the radial outer surface of the magnetic pole is changed, thereby reducing the moment of inertia of the rotor, thereby reducing the weight of the rotor, which helps to improve the starting and braking performance of the motor.

[0056] Optional, Figure 2 for Figure 1 A cross-sectional view of the rotating motor from another angle is shown. Figure 2 The magnetic pole 12 comprises at least one pole claw, and an outer surface of the at least one pole claw is provided with a chamfered portion, and the chamfered portion forms at least one chamfer 13 .

[0057] Specifically, the pole claw is integrally arranged with the magnetic pole 12 , and the pole claw includes a claw root and a claw tip. The claw root is formed by the edge of the magnetic pole 12 protruding along the axial direction, and the claw root is gradually extended along the axial direction to form the claw tip.

[0058] In this embodiment, a chamfered portion is provided on the outer surface of the pole claw to form a chamfer 13. Specifically, the chamfered portion extends from the claw root to the claw tip at a certain angle to form the chamfer 13, so that the formed chamfer 13 partially overlaps the stator core 21 in the axial direction.

[0059] Optionally, the number of the chamfered portions arranged on the corresponding pole claw is one or two, so that the corresponding pole claw has one or two chamfers 13 .

[0060] In one embodiment, at least one pole claw has a chamfer 13 , one chamfer 13 is a first chamfer 15 , and the first chamfer 15 is located at the claw root of the pole claw.

[0061] Figure 3 A cross-sectional view of another rotating electrical machine provided by an embodiment of the present invention. Figure 3 The number of the chamfered portions arranged at the corresponding pole claw is one, and one chamfered portion is formed at the claw root of the pole claw and extends toward the claw tip of the pole claw to form a first chamfer 15.

[0062] It should be noted that the extended end of the beveled portion can be located at the claw tip of the pole claw or at the middle of the pole claw. The specific position of the extended end of the beveled portion needs to be determined based on the performance requirements of the motor from two dimensions: the angle between the beveled portion and the stator core and the axial overlapping length L2 between the beveled portion and the stator core 21.

[0063] In another embodiment, at least one pole claw has two chamfers, namely a first chamfer 15 and a second chamfer 16; wherein,

[0064] The second chamfer 16 is located at the claw root of the pole claw;

[0065] The first chamfer 15 is located in the claw or at the claw tip of the pole claw, and along the axial direction of the rotor, the first chamfer 15 overlaps with the stator core 21 .

[0066] Continue to refer Figure 2 There are two chamfered portions arranged at the corresponding pole claw, wherein the chamfered portion located at the claw root forms a second chamfer 16 ; another chamfered portion is arranged adjacent to the chamfered portion to form a first chamfer 15 .

[0067] In this working condition, it is necessary to ensure that at least the first chamfer 15 overlaps the stator core 21 in the axial direction. For example, one end of the chamfered portion forming the second chamfer 16 can be extended to the claw center position of the pole claw, and the chamfered portion forming the first chamfer 15 extends from the claw center position to the claw tip, so that the first chamfer 15 overlaps the stator core 21 in the axial direction.

[0068] Of course, the second chamfer 16 can also be set to overlap with the stator core 21 in the axial direction. In this working condition, the first chamfer 15 and the second chamfer 16 overlap with the stator core 21 in the axial direction. Considering the stability of the motor, the angles of the beveled portions forming the two chamfers and the axial overlapping length L2 with the stator core 21 can be adjusted separately in combination with simulation tests to ensure that the motor has the best noise reduction effect.

[0069] Optional, Figure 4A cross-sectional view of another rotating electrical machine provided by an embodiment of the present invention. Figure 4 and Figure 3 The beveled portion is a curved surface or a smooth surface with a preset angle.

[0070] On this basis, when a pole claw has two chamfers, one of the chamfered portions can be set as a curved surface and the other chamfered portion can be set as a smooth surface; or, both chamfered portions can be set as curved surfaces or smooth surfaces.

[0071] Optionally, based on the above embodiment, continue to refer to Figure 2 The first chamfer 15 is connected to the second chamfer 16; or,

[0072] The first chamfer 15 and the second chamfer 16 have arc-shaped transition portions.

[0073] Specifically, the first chamfer 15 is connected to the second chamfer 16, and specifically the first chamfer 15 and the second chamfer 16 have a common end. This situation can be, for example: after the second chamfer 16 is processed, another beveled portion is directly processed at another angle at the end of the second chamfer 16 to form the first chamfer 15.

[0074] Alternatively, when there is a transition portion between the first chamfer 15 and the second chamfer 16 , the transition portion is processed into an arc shape so that the first chamfer 15 gradually transitions to the second chamfer 16 .

[0075] Optionally, based on the above embodiment, continue to refer to Figure 1 The number of magnetic poles 12 of the rotating electrical machine is two;

[0076] All pole claws of the two magnetic poles are provided with chamfers 13 ; or all pole claws of one magnetic pole 12 are provided with chamfers 13 ; or part of the pole claws of the two magnetic poles are provided with chamfers 13 ; or part of the pole claws of one magnetic pole 12 are provided with chamfers 13 .

[0077] Specifically, the two magnetic poles are respectively a front pole and a rear pole, which are arranged at two ends of the yoke to form a pair of magnetic poles. On this basis, the edge protrusion of each magnetic pole 12 extends toward the opposite magnetic pole 12 to form a pole claw.

[0078] In a preferred embodiment, a pair of magnetic poles are each provided with a plurality of pole claws, and the plurality of pole claws are evenly arranged circumferentially at the end of each magnetic pole 12. In this way, during normal operation of the motor, the heat generated by the rotor can be promptly discharged through the gaps between the circumferentially distributed pole claws, thereby improving the heat dissipation of the motor and facilitating stable operation of the motor.

[0079] When a pair of magnetic poles are both provided with pole claws, the pole claws of the pair of magnetic poles are arranged alternately, so that when the excitation coil 14 of the rotor provides an excitation current, an NS magnetic field is generated between the pole claws of the rotor, and the pair of magnetic poles of the rotor form a magnetic circuit with the stator core 21 through the pole claws for magnetic conduction and heat dissipation.

[0080] In actual use, in order to improve the working stability of the motor, a pair of magnetic poles is usually arranged symmetrically, that is, all pole claws of a pair of magnetic poles are provided with chamfers 13.

[0081] Optionally, based on the above embodiment, in order to achieve the best noise reduction effect, along the axial direction, the overlapping length L2 of the first chamfer 15 and the stator core 21 satisfies the following relationship:

[0082] 0.01≤L2 / L1≤0.3 (1)

[0083] Wherein: L1 is the length of the stator core; L2 is the overlapping length of the first chamfer and the stator core.

[0084] Specifically, because the position and length of the stator core 21 are fixed, when the motor mode is fixed, the axial overlapping length L2 between the chamfer 13 and the stator core 21 can be adjusted by adjusting the length of the chamfered portion forming the chamfer 13 .

[0085] At the same time, according to the simulation results, when the axial overlap length L2 between the chamfer 13 and the stator core 21 is constant, the change in the angle between the chamfer 13 and the stator core 21 will also affect the noise reduction effect of the motor. In one embodiment, the angle α1 between the chamfer 13 and the stator core 21 is determined according to the following relationship:

[0086] There is a preset angle between the first chamfer 15 and the stator core 21, and the preset angle satisfies the following relationship:

[0087] 1°≤α1≤30° (2)

[0088] Wherein: α1 is a preset angle between the first chamfer 15 and the stator core 21 .

[0089] Figure 6 The electromagnetic noise of the motor provided by the embodiment of the present invention varies with the overlapping length of the chamfer and the stator core and the preset angle between the chamfer and the stator core. Figure 6 It can be seen that when the angle between the chamfer 13 and the stator core 21 increases between 1° and 30°, the electromagnetic force gradually decreases; when the axial overlap length L2 between the chamfer 13 and the stator core 21 increases between 0.01 and 0.3, the electromagnetic force gradually decreases. In this angle range and this overlap length range, the electromagnetic force is relatively small as a whole, so that the motor has the best noise reduction effect.

[0090] In this embodiment, the overlapping length L2 between the chamfer 13 and the stator core 21 and the preset angle between the chamfer 13 and the stator core 21 are quantified. When the axial overlapping length L2 between the chamfer 13 and the stator core 21 satisfies formula (1) and the angle between the chamfer 13 and the stator core 21 satisfies the range of formula (2), the high-order harmonics of the motor magnetic permeance are effectively suppressed. Therefore, under the action of the same stator magnetomotive force, the amplitude of the high-order radial electromagnetic force of the motor can be effectively reduced, thereby achieving the best noise reduction effect.

[0091] In this embodiment, because the radial outer surface of the pole claw is provided with a chamfer 13, the outer surface area of ​​the pole claw is reduced. When the radial outer surface area is reduced to a certain extent, the average air gap increases, so that the comprehensive magnetic resistance increases, thereby reducing the output of the motor. In order to solve this problem, this embodiment increases the effective magnetic flux by changing the length ratio of the stator core 21 and the excitation coil 14, thereby improving the output of the motor. The method for improving the output of the motor provided by this embodiment is further introduced below in conjunction with the accompanying drawings.

[0092] Optionally, based on the above embodiment, continue to refer to Figure 1 and Figure 2 The rotor further includes an excitation coil 14 wound around the rotating shaft 11, and the length of the excitation coil 14 satisfies the following relationship:

[0093] 1.0≤L1 / L4≤1.1 (3)

[0094] Where: L1 is the length of the stator core; L4 is the length of the excitation coil.

[0095] Specifically, the excitation coil 14 of the rotor provides an excitation current, thereby forming a magnetic field between the pole claws of the rotor.

[0096] The stator winding generates an alternating current in the rotor's alternating magnetic field.

[0097] L1 is the length of the stator core 21, which is consistent with the effective length of the wire in the stator winding. This effective length participates in cutting the magnetic lines of force and generates magnetomotive force E. According to the calculation formula of the wire resistance:

[0098]

[0099] Where: R is the wire resistance; ρ is the wire resistivity; L is the wire length; S is the wire cross-sectional area.

[0100] It can be seen that when the cross-sectional area of ​​the wire is constant, the smaller the wire length, the smaller the resistance value of the wire. According to the calculation formula of the generated current:

[0101]

[0102] Where: E is the magnetomotive force; R is the wire resistance.

[0103] It can be concluded that the smaller the wire resistance is, the greater the generated current is, so increasing the effective length of the wire in the stator winding can improve the output performance of the motor.

[0104] Since the magnitude of the magnetomotive force is related to the length of the excitation coil 14 , it is necessary to comprehensively consider the length of the excitation coil 14 and the effective length of the wire in the stator winding so that the motor has the best output.

[0105] Optional, Figure 5 The output current provided by the embodiment of the present invention varies with the length ratio of the excitation coil to the stator core. Figure 5 It can be seen that when the ratio of the length of the stator core 21 to the length of the excitation coil 14 is less than the first threshold value (corresponding to 1.0 in the figure), the output current of the motor continues to increase with the increase of the ratio of the length of the stator core 21 to the length of the excitation coil 14; when the ratio of the length of the stator core 21 to the length of the excitation coil 14 increases to the second threshold value (corresponding to 1.1 in the figure), the output current of the motor will decrease. According to simulation experiments, when the ratio of the length of the core to the length of the excitation coil 14 is set within the range of formula (3), the motor has the best output current value.

[0106] In this embodiment, under the condition that the parameters of the excitation coil 14 remain unchanged, by changing the length of the stator core 21, the effective length of the wire in the stator winding is changed, and the ratio of the length of the stator core 21 to the length of the excitation coil 14 is changed. Since the length of the stator winding wire is reduced, the wire resistance value is reduced, thereby increasing the output current of the motor, and achieving the purpose of improving the motor performance. At the same time, the amount of core material and stator winding copper wire is reduced, the material cost is reduced, and the weight of the motor is also reduced.

[0107] Optionally, based on the above embodiment, the ratio of the radial thickness of the pole claw tip to the radial thickness of the pole claw root may be changed to optimize the electromagnetic magnetic circuit of the rotor, increase the effective magnetic flux, and thus increase the output value of the motor.

[0108] For details, please continue to refer to Figure 4In the figure, H1 is the radial thickness of the claw tip of the pole claw, and H2 is the radial thickness of the claw root of the pole claw. The tangential magnetic flux on the side of the rotor's tapered pole claw, that is, the tangential leakage magnetic flux, directly affects the induced electromotive force of the motor, and the tangential magnetic flux between two adjacent pole claws is related to the side surface area. If the side surface area of ​​the rotor pole claw is too large, there will be a large amount of leakage magnetic flux between the side surfaces of two adjacent pole claws, which will reduce the effective magnetic flux and reduce the motor output. The side surface area of ​​the rotor pole claw is related to the radial thickness H1 of the claw tip of the pole claw and the radial thickness H2 of the claw root of the pole claw. At the same time, the side surface size of the rotor pole claw is related to the strength of the rotor pole claw, and the rotor pole claw needs to withstand a high-speed working mode. Therefore, the side surface size of the pole claw, as well as the radial thickness H1 of the claw tip of the pole claw and the radial thickness H2 of the claw root of the pole claw need to be within a reasonable range, and the tangential leakage magnetic flux needs to be reduced while ensuring the strength. When the ratio of the radial thickness H1 of the pole claw tip to the radial thickness H2 of the pole claw root satisfies the following relationship, the range of the pole claw side surface size can reduce tangential magnetic leakage, ensure strength, and at the same time increase the effective magnetic flux, thereby increasing the output of the motor.

[0109] 0.05≤H1 / H2≤0.4 (8)

[0110] In a preferred embodiment of the present invention, the ratio of the radial thickness H1 of the pole claw tip to the radial thickness H2 of the pole claw root is specifically within the following range: H1 / H2∈(0.05, 0.1)U(0.25, 0.4).

[0111] This embodiment effectively improves the electromagnetic magnetic circuit, reduces magnetic leakage, increases effective magnetic flux, and thus improves the output of the motor by adjusting the ratio of the radial thickness H1 of the claw tip of the rotor pole claw to the radial thickness H2 of the claw root of the pole claw.

[0112] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A rotating electrical machine, characterized in that: including a stator and a rotor; The rotor comprises a rotating shaft and magnetic poles fixed to the rotating shaft, wherein a radial outer surface of at least one of the magnetic poles is provided with a chamfer; The stator comprises a stator core, the stator core is located on a side of the magnetic pole away from the rotating shaft, and along the axial direction of the rotor, the chamfer overlaps with the stator core; The stator core includes a plurality of tooth slots with equal spacing, and each of the tooth slots has the same shape.

2. The rotating electrical machine according to claim 1, characterized in that: The magnetic pole comprises at least one pole claw, and an outer surface of at least one pole claw is provided with a chamfered portion, and the chamfered portion forms at least one chamfer.

3. The rotating electrical machine according to claim 2, characterized in that: The chamfered portion is an arc-shaped surface or a smooth surface with a preset angle.

4. The rotating electrical machine according to claim 2, characterized in that: The number of the magnetic poles is two; All the pole claws of the two magnetic poles are provided with the chamfers; or, all the pole claws of one magnetic pole are provided with the chamfers; or, part of the pole claws of each of the two magnetic poles are provided with the chamfers; or, part of the pole claws of one magnetic pole are provided with the chamfers.

5. The rotating electrical machine according to claim 2, characterized in that: At least one of the pole claws has one chamfer, one of the chamfers is a first chamfer, and the first chamfer is located at the claw root of the pole claw.

6. The rotating electrical machine according to claim 2, characterized in that: At least one of the pole claws has two chamfers, namely a first chamfer and a second chamfer; wherein, The second chamfer is located at the claw root of the pole claw; The first chamfer is located in the claw or at the claw tip of the pole claw, and along the axial direction of the rotor, the first chamfer overlaps with the stator core.

7. The rotating electrical machine according to claim 6, characterized in that The first chamfer is connected to the second chamfer; or, The first chamfer and the second chamfer have an arc-shaped transition portion.

8. The rotating electrical machine according to claim 5 or 6, characterized in that: Along the axial direction, the overlapping length of the first chamfer and the stator core satisfies the following relationship: 0.01≤L2 / L1≤0.3 (1) Wherein: L1 is the length of the stator core; L2 is the overlapping length of the first chamfer and the stator core.

9. The rotating electrical machine according to claim 5 or 6, characterized in that: There is a preset angle between the first chamfer and the stator core, and the preset angle satisfies the following relationship: 1°≤α1≤30° (2) Wherein: α1 is a preset angle between the first chamfer and the stator core.

10. The rotating electrical machine according to claim 1, characterized in that The rotor further includes an excitation coil wound around the rotating shaft, and the length of the excitation coil satisfies the following relationship: 1.0≤L1 / L4≤1.1 (3) Wherein: L1 is the length of the stator core; L4 is the length of the excitation coil.

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