Motor for inhibiting torque pulsation by adopting staggered poles of permanent magnets

Abstract

The utility model discloses a motor for inhibiting torque pulsation by adopting staggered poles of permanent magnets, which comprises an outer rotor assembly fixedly mounted with a motor shaft into a whole and an inner stator assembly positioned on the inner circumference of the outer rotor assembly, the inner side wall of the rotor yoke part is at least provided with a plurality of first permanent magnets which are uniformly distributed at intervals in the circumferential direction and a plurality of second permanent magnets which are uniformly distributed at intervals in the circumferential direction; wherein the number of the first permanent magnets is equal to that of the second permanent magnets; the first section of permanent magnet and the second section of permanent magnet are arranged and distributed in a staggered pole manner; according to the utility model, the torque pulsation of the motor can be obviously reduced, so that the outer rotor permanent magnet motor has the operation performance of stable noise reduction; the permanent magnet staggered pole arrangement distribution provided by the utility model is especially suitable for being applied to a motor adopting a fractional slot distribution winding, and has a very remarkable torque pulsation suppression effect.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor field, concretely relates to a kind of motor of adopting permanent magnet misalignment to inhibit torque ripple. BACKGROUND

[0002] Permanent magnet motor provides excitation by permanent magnet, with many advantages such as high efficiency, simple structure, large starting torque and wide speed regulation range.But permanent magnet motor in work operation, torque ripple is generated by the interaction between permanent magnet and stator tooth, the generation of torque ripple will cause permanent magnet motor to occur speed fluctuation, vibration and noise, and further affect the working performance of permanent magnet motor.

[0003] Some technical solutions currently propose to use permanent magnet misalignment to reduce cogging torque, but there is still a lack of solutions to suppress torque ripple for outer rotor motors.

[0004] Based on the years of focused research experience in this field of the present inventor, the applicant hopes to improve the above technical problems by technical solutions. SUMMARY

[0005] Therefore, the utility model discloses the purpose at providing a kind of motor of adopting permanent magnet misalignment to inhibit torque ripple, can significantly reduce the torque ripple of motor, so that outer rotor permanent magnet motor has the operating performance performance of stable noise reduction;The permanent magnet misalignment distribution proposed in the present application is especially suitable for being applied to the motor using fractional slot distribution winding, has very significant torque ripple suppression effect.

[0006] The technical scheme of the utility model is as follows:

[0007] A kind of motor of adopting permanent magnet misalignment to inhibit torque ripple, including with the outer rotor assembly of motor shaft fixed installation as an organic whole, and the inner stator assembly in the inner periphery of outer rotor assembly, it is characterized in that, the outer rotor assembly includes the ring-shaped rotor yoke, the inner side wall of the rotor yoke is at least provided with the first segment permanent magnet that is evenly spaced distribution in circumference and the second segment permanent magnet that is evenly spaced distribution in circumference;Wherein, the number of the first segment permanent magnet is equal to the number of the second segment permanent magnet;And the first segment permanent magnet and the second segment permanent magnet are misalignment distribution.

[0008] Preferably, each first segment permanent magnet is distributed and arranged in N magnetic pole and S magnetic pole alternation along the circumference;Each second segment permanent magnet is distributed and arranged in N magnetic pole and S magnetic pole alternation along the circumference;Wherein, the N magnetic pole of the first segment permanent magnet and the N magnetic pole of the second segment permanent magnet are misalignment distribution, and the S magnetic pole of the first segment permanent magnet and the S magnetic pole of the second segment permanent magnet are misalignment distribution in circumference.

[0009] Preferably, the misaligned pole arrangement has a misaligned pole angle of 0.1-5°; wherein the misaligned pole angle refers to the included angle between the center line of the S magnetic pole or the N magnetic pole of the first section permanent magnet and the center line of the S magnetic pole or the N magnetic pole of the corresponding second section permanent magnet.

[0010] Preferably, the misaligned pole arrangement has a misaligned pole angle of 0.3-3°.

[0011] Preferably, the first section permanent magnets are provided with first section permanent magnet spacers fixed on the inner side wall of the rotor yoke portion, wherein the first grooves for fixing the first section permanent magnets are formed between adjacent first section permanent magnet spacers; the second section permanent magnets are provided with second section permanent magnet spacers fixed on the inner side wall of the rotor yoke portion, wherein the second grooves for fixing the first section permanent magnets are formed between adjacent second section permanent magnet spacers.

[0012] Preferably, the first section permanent magnets and the second section permanent magnets are both made of neodymium iron boron.

[0013] Preferably, the first section permanent magnets and the second section permanent magnets are arranged in a spaced manner in the axial direction.

[0014] Preferably, the first section permanent magnets and the second section permanent magnets have equal sizes, wherein the thickness of the first section permanent magnets ranges from 1.1-2mm.

[0015] Preferably, the rotor yoke portion is formed by roll forming, and the end portion is provided with a plurality of mounting grooves for fixedly connecting with external fasteners.

[0016] Preferably, the motor adopts fractional slot distributed winding.

[0017] The first section permanent magnets and the second section permanent magnets arranged in a misaligned pole arrangement on the inner side wall of the rotor yoke portion can significantly reduce the torque ripple of the motor, so that the outer rotor permanent magnet motor has a smooth and noise-reducing operation performance; the misaligned pole arrangement of the permanent magnet is particularly suitable for application in a motor with fractional slot distributed winding, and has a very significant torque ripple suppression effect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view of an end face structure of an outer rotor assembly in the specific embodiment of the present application;

[0019] Figure 2 is a sectional view of the outer rotor assembly in the lateral direction in the specific embodiment of the present application. DETAILED DESCRIPTION

[0020] The utility model discloses an adopt permanent magnet pole error inhibiting torque pulsation's motor, including with the motor shaft fixed mounting as the integral outer rotor subassembly and the inner stator subassembly of the outer rotor subassembly inner periphery, the outer rotor subassembly includes the ring of rotor yoke part, and the inner side wall of rotor yoke part is at least equipped with the first section permanent magnet of the uniform interval distribution of the circumference and the second section permanent magnet of the uniform interval distribution of the circumference, wherein, the number of first section permanent magnet is equal with the number of second section permanent magnet, and first section permanent magnet and second section permanent magnet are pole error arrangement distribution.

[0021] In order to make the technical personnel in the technical field better understand the technical scheme in the utility model, the technical scheme in the utility model embodiment will be described clearly and completely below in conjunction with the drawings in the utility model embodiment, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor should belong to the protection scope of the utility model.

[0022] Please combine with the description of the drawings Figure 1 And Figure 2 As shown in figure, a kind of motor of adopting permanent magnet pole error inhibiting torque pulsation, including with the motor shaft fixed mounting as the integral outer rotor subassembly 1 and the inner stator subassembly of the outer rotor subassembly 1 inner periphery, it is characterized in that, outer rotor subassembly 1 includes the ring of rotor yoke part 11, and the inner side wall of rotor yoke part 11 is at least equipped with the first section permanent magnet 12 of the uniform interval distribution of the circumference and the second section permanent magnet 13 of the uniform interval distribution of the circumference;Wherein, the number of first section permanent magnet 12 is equal with the number of second section permanent magnet 13;And first section permanent magnet 12 and second section permanent magnet 13 are pole error arrangement distribution.

[0023] Preferably, in the present embodiment, motor adopts fractional slot distribution winding;Rotor yoke part 11 adopts roll circle and is formed, and its end portion is equipped with a plurality of installation groove 14 for being fixedly installed with external fastener and is connected;Preferably, in the present embodiment, the size of first section permanent magnet 12 and second section permanent magnet 13 is equal, wherein, the thickness range of first section permanent magnet 12 is 1.1-2mm.

[0024] Preferably, in the present embodiment, first section permanent magnet 12 and second section permanent magnet 13 all adopt neodymium iron boron.

[0025] Preferably, in the present embodiment, the first segment permanent magnets 12 are arranged in an alternating N-pole and S-pole distribution in the circumferential direction; the second segment permanent magnets 13 are arranged in an alternating N-pole and S-pole distribution in the circumferential direction; wherein the N-pole of the first segment permanent magnet 12 is arranged in a pole staggering distribution with the N-pole of the second segment permanent magnet 13, and the S-pole of the first segment permanent magnet 12 is arranged in a pole staggering distribution with the S-pole of the second segment permanent magnet 13 in the circumferential direction.

[0026] Preferably, in the present embodiment, the pole staggering angle of the pole staggering distribution is 0.1-5°, more preferably 0.3-3°; wherein the pole staggering angle refers to the included angle between the center line of the S-pole or N-pole of the first segment permanent magnet 12 and the center line of the S-pole or N-pole of the corresponding second segment permanent magnet 13; specifically preferably, in the present embodiment, the pole staggering angle of the pole staggering distribution is 0.7°.

[0027] It should be particularly noted that in other embodiments, the required pole staggering angle can be specifically determined in combination with the number of magnetic poles and the number of slots of the applied motor, which is not uniquely limited in the present application.

[0028] Preferably, in order to facilitate the efficient pasting effect of the permanent magnets on the inner side wall of the rotor yoke 11, in the present embodiment, first segment permanent magnet spacing portions 15 fixed on the inner side wall of the rotor yoke 11 are provided between adjacent first segment permanent magnets 12, wherein first grooves for fixing the first segment permanent magnets 12 are formed between adjacent first segment permanent magnet spacing portions 15; second segment permanent magnet spacing portions 16 fixed on the inner side wall of the rotor yoke 11 are provided between adjacent second segment permanent magnets 13, wherein second grooves for fixing the first segment permanent magnets 12 are formed between adjacent second segment permanent magnet spacing portions 16.

[0029] Preferably, in the present embodiment, the first segment permanent magnets 12 and the second segment permanent magnets 13 are arranged in a spaced distribution in the axial direction.

[0030] The present embodiment proposes to arrange the first segment permanent magnets 12 and the second segment permanent magnets 13 in a pole staggering distribution on the inner side wall of the rotor yoke 11, which can significantly reduce the torque ripple of the motor after implementation and application, so that the outer rotor permanent magnet motor has a smooth and noise-reducing operation performance; the pole staggering distribution of the permanent magnets proposed in the present embodiment is particularly suitable for application to motors using fractional slot distributed windings, and has a very significant torque ripple suppression effect.

[0031] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0032] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A motor with permanent magnet pole error torque ripple suppression, comprising an outer rotor assembly fixedly mounted with a motor shaft as a whole, and an inner stator assembly located at the inner periphery of the outer rotor assembly, characterized in that, The outer rotor assembly comprises a ring-shaped rotor yoke, and an inner side wall of the rotor yoke is provided with a plurality of first-section permanent magnets and a plurality of second-section permanent magnets which are uniformly distributed in a circumferential direction; the number of the first-section permanent magnets is equal to that of the second-section permanent magnets; and the first-section permanent magnets and the second-section permanent magnets are arranged in an alternate manner.

2. The electric machine of claim 1, wherein, Each first-section permanent magnet is arranged in an alternate manner of N magnetic poles and S magnetic poles in the circumferential direction; each second-section permanent magnet is arranged in an alternate manner of N magnetic poles and S magnetic poles in the circumferential direction; the N magnetic pole of the first-section permanent magnet and the N magnetic pole of the second-section permanent magnet are arranged in an alternate manner, and the S magnetic pole of the first-section permanent magnet and the S magnetic pole of the second-section permanent magnet are arranged in an alternate manner in the circumferential direction.

3. The electric machine of claim 1, wherein, The alternate angle of the alternate arrangement is 0.1-5°; the alternate angle refers to an included angle between the center line of the S magnetic pole or the N magnetic pole of the first-section permanent magnet and the center line of the S magnetic pole or the N magnetic pole of the corresponding second-section permanent magnet.

4. The electric machine of claim 3, wherein, The alternate angle of the alternate arrangement is 0.3-3°.

5. The electric machine of claim 1 wherein, Adjacent first-section permanent magnets are provided with first-section permanent magnet spacing portions fixed on the inner side wall of the rotor yoke, wherein adjacent first-section permanent magnet spacing portions form first grooves for fixing the first-section permanent magnets; and adjacent second-section permanent magnets are provided with second-section permanent magnet spacing portions fixed on the inner side wall of the rotor yoke, wherein adjacent second-section permanent magnet spacing portions form second grooves for fixing the first-section permanent magnets.

6. The electric machine of claim 1 wherein, The first-section permanent magnets and the second-section permanent magnets are made of neodymium iron boron.

7. The electric machine of claim 1 wherein, The first-section permanent magnets and the second-section permanent magnets are arranged in a spaced manner in the axial direction.

8. The electric machine of claim 1 wherein, The first-section permanent magnets and the second-section permanent magnets have equal sizes, wherein the thickness of the first-section permanent magnets ranges from 1.1 mm to 2 mm.

9. The electric machine of claim 1 wherein, The rotor yoke is formed by rolling, and the end portion of the rotor yoke is provided with a plurality of installation grooves for fixedly connecting with external fasteners.

10. The electric machine of claim 1 wherein, The motor adopts fractional-slot distributed winding.

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