Sectionally arranged permanent magnet structure

Abstract

The utility model discloses a sectional type arranged permanent magnet structure. The inner side wall of an annular rotor yoke part is provided with a plurality of first section permanent magnets which are uniformly distributed at intervals in the circumferential direction and a plurality of second section permanent magnets which are uniformly distributed at intervals in the circumferential direction; wherein the adjacent first sections of permanent magnets are in close contact, and the first sections of permanent magnets and the second sections of permanent magnets are distributed at intervals; according to the utility model, the Pc value of the permanent magnet structure can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the motor field, concretely relates to a sectional permanent magnet structure. BACKGROUND

[0002] Permanent magnet motor provides excitation through permanent magnet, has many advantages such as high work efficiency, simple structure, large starting torque and wide speed regulating range. Specifically, the Pc value of permanent magnet is one of the performance indexes that the person skilled in the art considers when designing motor performance, especially when the Pc value of permanent magnet is small, the demagnetization of magnet under high temperature is large, which can affect the normal use of the whole machine.

[0003] Some technologies have proposed permanent magnets of different shapes or grades to improve the Pc value, but the effect is not obvious, or the material cost is too high.

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

[0005] Therefore, the utility model discloses a sectional permanent magnet structure, which can effectively improve the Pc value of the permanent magnet structure.

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

[0007] A sectional permanent magnet structure is provided, which comprises a plurality of first segment permanent magnets and a plurality of second segment permanent magnets that are uniformly and spacedly distributed in the circumferential direction on the inner side wall of the ring-shaped rotor yoke portion.

[0008] Preferably, a plurality of third segment permanent magnets are arranged on the inner side wall of the ring-shaped rotor yoke portion in a uniformly and spacedly distributed manner in the circumferential direction, wherein adjacent third segment permanent magnets are in close contact, and the third segment permanent magnets and the second segment permanent magnets are spacedly distributed, and the second segment permanent magnets are located between the third segment permanent magnets and the first segment permanent magnets.

[0009] Preferably, the gap between the first segment permanent magnets and the second segment permanent magnets is 0.3-1mm.

[0010] Preferably, the number of the first segment permanent magnets is equal to the number of the second segment permanent magnets.

[0011] Preferably, the shape of the first segment permanent magnets is the same as that of the second segment permanent magnets.

[0012] Preferably, the surface of the first segment permanent magnet is rectangular in shape, and its thickness ranges from 1.1 to 2 mm.

[0013] Preferably, the bottom surface of the first segment permanent magnet and the second segment permanent magnet is fixedly bonded to the inner side wall of the rotor yoke.

[0014] Preferably, the first segment permanent magnet and the second segment permanent magnet are both made of neodymium iron boron.

[0015] Due to the torque pulsation generated by the interaction between the permanent magnet and the stator teeth during the operation of the permanent magnet motor, the torque pulsation will cause the permanent magnet motor to have speed fluctuation, vibration and noise, thereby affecting the working performance of the permanent magnet motor. Therefore, preferably, each first segment permanent magnet is arranged in an alternating manner with N magnetic poles and S magnetic poles in the circumferential direction; each second segment permanent magnet is arranged in an alternating manner with N magnetic poles and S magnetic poles in the circumferential direction; wherein the N magnetic poles of the first segment permanent magnet and the N magnetic poles of the second segment permanent magnet are arranged in a staggered manner, and the S magnetic poles of the first segment permanent magnet and the S magnetic poles of the second segment permanent magnet are arranged in a staggered manner in the circumferential direction.

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

[0017] The application provides a plurality of first segment permanent magnets and a plurality of second segment permanent magnets which are uniformly and circumferentially spaced apart on the inner side wall of the annular rotor yoke; the adjacent first segment permanent magnets are arranged in close contact, and the first segment permanent magnets and the second segment permanent magnets are arranged in a spaced apart manner; thereby obtaining a segmented permanent magnet structure, which has been actually verified to effectively improve the Pc value of the permanent magnet structure.

[0018] The application further provides the first segment permanent magnets and the second segment permanent magnets arranged in a staggered manner on the inner side wall of the rotor yoke, which can significantly reduce the torque pulsation of the motor and make the outer rotor permanent magnet motor have stable and noise-reducing operation performance. The staggered arrangement of the permanent magnets is particularly suitable for motors using fractional slot distributed winding, and has a very significant torque pulsation suppression effect. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a segmented permanent magnet structure schematic diagram in the specific embodiment of the application;

[0020] Figure 2 is a schematic diagram of the end surface structure of Figure 1 ;

[0021] Figure 3 is a schematic diagram of the side surface structure of Figure 1 ;

[0022] Figure 4 is Figure 3 A-A direction cross-sectional view. DETAILED DESCRIPTION

[0023] The utility model discloses a kind of segmented permanent magnet structures, several first segment permanent magnets being distributed in the circumferential uniform interval are arranged in the inside wall of annular rotor yoke part, and several second segment permanent magnets being distributed in the circumferential uniform interval are arranged;Wherein, between adjacent first segment permanent magnets, it is in close contact, and first segment permanent magnet and second segment permanent magnet are in spaced distribution.

[0024] In order to make the person in the technical field better understand the technical scheme in the utility model, the technical scheme in the embodiment of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiment of the utility model, obviously, the described embodiment is only a part of the embodiment of the utility model, not all. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor should belong to the protection scope of the utility model.

[0025] Please see Figure 1 、 Figure 2 、 Figure 3 And Figure 4 It is shown that a kind of segmented permanent magnet structures, several first segment permanent magnets 2 being distributed in the circumferential uniform interval are arranged in the inside wall of annular rotor yoke part 1, and several second segment permanent magnets 3 being distributed in the circumferential uniform interval are arranged;Wherein, between adjacent first segment permanent magnets 2, it is in close contact, and first segment permanent magnet 2 and second segment permanent magnet 3 are in spaced distribution;Preferably, in other implementation manners, several third segment permanent magnets being distributed in the circumferential uniform interval can also be arranged in the inside wall of annular rotor yoke part 1;Wherein, between adjacent third segment permanent magnets, it is in close contact, and third segment permanent magnet and second segment permanent magnet 3 are in spaced distribution, and second segment permanent magnet 3 is located between third segment permanent magnet and first segment permanent magnet 2;Based on this design principle, more segment permanent magnets can be further arranged.

[0026] Preferably, in the present embodiment, the gap between first segment permanent magnet 2 and second segment permanent magnet 3 is 0.3-1mm, more preferably 0.5-0.8mm;Preferably, the surface of first segment permanent magnet 2 is rectangular shape, and its thickness range is 1.1-2mm;Further preferably, in the present embodiment, the length of first segment permanent magnet 2 is 15-35mm, and its width is 8-12mm, and the length and width required can be set according to actual demand;

[0027] Preferably, in the present embodiment, the number of first section permanent magnets 2 is equal to the number of second section permanent magnets 3; the shape of the first section permanent magnets 2 is the same as the shape of the second section permanent magnets 3; in order to further improve the Pc value of the permanent magnet structure, preferably, in the present embodiment, both the first section permanent magnets 2 and the second section permanent magnets 3 are made of neodymium iron boron.

[0028] Preferably, in the present embodiment, the bottom surface of the first section permanent magnet 2 and the second section permanent magnet 3 is fixedly bonded to the inner side wall of the rotor yoke 1.

[0029] Preferably, in the present embodiment, each first section permanent magnet 2 is arranged in an alternating N-pole and S-pole distribution in the circumferential direction; each second section permanent magnet 3 is arranged in an alternating N-pole and S-pole distribution in the circumferential direction; wherein the N-pole of the first section permanent magnet 2 is arranged in a skew pole distribution with the N-pole of the second section permanent magnet 3, and the S-pole of the first section permanent magnet 2 is arranged in a skew pole distribution with the S-pole of the second section permanent magnet 3 in the circumferential direction.

[0030] Preferably, in the present embodiment, the skew pole angle of the skew pole distribution is 0.1-5°, more preferably 0.3-3°; wherein the skew pole angle refers to the included angle between the center line of the S-pole or the N-pole of the first section permanent magnet 2 and the center line of the S-pole or the N-pole of the corresponding second section permanent magnet 3; specifically preferably, in the present embodiment, the skew pole angle of the skew pole distribution is 0.7°.

[0031] It should be particularly noted that in other embodiments, the required skew pole angle can be 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.

[0032] Preferably, in the present embodiment, the motor adopts fractional slot distributed winding.

[0033] The present embodiment proposes to arrange a plurality of first section permanent magnets 2 and a plurality of second section permanent magnets 3 in a circumferentially uniform and spaced distribution on the inner side wall of the annular rotor yoke 1; to arrange the adjacent first section permanent magnets 2 in a close contact state, and to arrange the first section permanent magnets 2 and the second section permanent magnets 3 in a spaced distribution; thereby obtaining a segmented permanent magnet structure, which has been actually verified to effectively improve the Pc value of the permanent magnet structure.

[0034] At the same time, the present embodiment also proposes to arrange the first section permanent magnets 2 and the second section permanent magnets 3 in a skew pole distribution on the inner side wall of the rotor yoke 1, which can significantly reduce the torque ripple of the motor after being implemented and applied, so that the outer rotor permanent magnet motor has a smooth and noise-reducing operation performance; the skew pole distribution of the permanent magnets proposed in the present embodiment is particularly suitable for application to motors with fractional slot distributed winding, and has a very significant torque ripple suppression effect.

[0035] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments should, therefore, be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalents of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the scope of the claims concerned.

[0036] Furthermore, it should be understood that although the present specification describes exemplary embodiments, the application is not limited to only one independent technical solution in each embodiment, and the specification is described in this way only for the sake of clarity. 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 segmented permanent magnet structure, characterized by, A plurality of first permanent magnets and a plurality of second permanent magnets are arranged on the inner wall of the annular rotor yoke in a circumferentially uniform and spaced manner; wherein the adjacent first permanent magnets are in close contact, and the first permanent magnets and the second permanent magnets are arranged in a spaced manner.

2. The segmented permanent magnet structure of claim 1, wherein, A plurality of third permanent magnets are arranged on the inner wall of the annular rotor yoke in a circumferentially uniform and spaced manner; wherein the adjacent third permanent magnets are in close contact, and the third permanent magnets and the second permanent magnets are arranged in a spaced manner, and the second permanent magnets are located between the third permanent magnets and the first permanent magnets.

3. The segmented permanent magnet structure of claim 1, wherein, The gap between the first permanent magnets and the second permanent magnets is 0.3-1mm.

4. The segmented permanent magnet structure of claim 1, wherein, The number of the first permanent magnets is equal to the number of the second permanent magnets.

5. The segmented permanent magnet structure of claim 1, wherein, The shape of the first permanent magnets is the same as the shape of the second permanent magnets.

6. The segmented permanent magnet structure of claim 5, wherein, The surface of the first permanent magnets is in the shape of a rectangle, and the thickness thereof is in the range of 1.1-2mm.

7. The segmented permanent magnet structure of claim 5, wherein, The bottom surface of the first permanent magnets and the second permanent magnets is fixedly bonded on the inner wall of the rotor yoke.

8. The segmented permanent magnet structure of claim 1, wherein, The first permanent magnets and the second permanent magnets are made of neodymium iron boron.

9. The segmented permanent magnet structure of claim 1, wherein, Each first permanent magnet is arranged in an alternating N-pole and S-pole distribution along the circumference; each second permanent magnet is arranged in an alternating N-pole and S-pole distribution along the circumference; wherein the N-pole of the first permanent magnet and the N-pole of the second permanent magnet are arranged in a staggered pole arrangement, and the S-pole of the first permanent magnet and the S-pole of the second permanent magnet are arranged in a staggered pole arrangement along the circumference.

10. The segmented permanent magnet structure of claim 1, wherein, The applied motor adopts fractional slot distribution winding.

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