CN214479889U

CN214479889U - Low mutual inductance motor

Info

Publication number: CN214479889U
Application number: CN202120415244.1U
Authority: CN
Inventors: 季汉川; 韩光鲜
Original assignee: Shanghai Anpu Mingzhi Automation Equipment Co ltd
Current assignee: Shanghai Anpu Mingzhi Automation Equipment Co ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-10-22
Anticipated expiration: 2031-02-25

Abstract

The utility model relates to a low mutual inductance motor, including stator core, pivot, magnet steel and winding, the magnet steel assembly in the pivot, stator core on be equipped with the stator main pole, the winding on the stator main pole, the stator main pole on the stator pole shoe adopt asymmetric structure. Compared with the prior art, the utility model has the advantages of reduce the motor interphase mutual inductance.

Description

Low mutual inductance motor

Technical Field

The utility model relates to a motor especially relates to a low mutual inductance motor.

Background

The permanent magnet synchronous motor provides excitation by the permanent magnet, so that the structure of the motor is simpler, the processing and assembly cost is reduced, a collecting ring and an electric brush which are easy to cause problems are omitted, and the running reliability of the motor is improved; and because excitation current is not needed, excitation loss is avoided, and the efficiency and the power density of the motor are improved.

The structure of the existing permanent magnet synchronous motor is shown in fig. 1, the stator poles of the existing permanent magnet synchronous motor are provided with symmetrical pole shoes as shown in fig. 2, the self-inductance and mutual-inductance curves of the motor with the ordinary symmetrical pole shoe structure are shown in fig. 3, the self-inductance and mutual-inductance of the motor are generally higher, and therefore higher rotating speed and faster current response cannot be obtained.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a reduce the mutual inductance's of motor phase-to-phase low mutual inductance motor in order to overcome the defect that above-mentioned prior art exists.

The purpose of the utility model can be realized through the following technical scheme:

according to the utility model discloses an aspect provides a low mutual inductance motor, including stator core, pivot, magnet steel and winding, the magnet steel assembly in the pivot, stator core on be equipped with the stator main pole, the winding around on the stator main pole, the stator main pole on the stator pole shoe adopt asymmetric structure.

Preferably, the widths bs0 of the slots between the stator main poles of different adjacent phases are increased, so that the stator pole shoes on the stator main poles are in an asymmetric structure.

Preferably, the width bs0 of the notch is in the range of 0.4 to 1.4 mm.

Preferably, the width bs0 of the notch is 0.9 mm.

Preferably, the thickness hs of the stator pole shoes of the adjacent different phases is thinned.

Preferably, the thickness hs of the stator pole shoe ranges from 0.4 mm to 1.4 mm.

Preferably, the thickness hs of the stator pole shoe is 0.9 mm.

Preferably, the motor is a 10-pole 12-slot motor.

Preferably, the motor is an 8-pole 9-slot motor.

Preferably, the motor is a 14-pole 12-slot motor.

Compared with the prior art, the utility model has the advantages of it is following:

1) the utility model discloses a mode of asymmetric pole shoe can effectively reduce alternate mutual inductance for the occasion of some special control requirements.

2) The utility model discloses a mode of asymmetric pole shoe can reduce motor line inductance, reduces motor self inductive reactance, can improve the high-speed scope of operation of motor.

3) The utility model discloses a mode of asymmetric pole shoe can reduce the motor inductance, can reduce current response time, makes the motor realize higher acceleration and deceleration.

4) The utility model discloses a mode of asymmetric pole shoe can improve surface-mounted permanent magnet synchronous motor's salient pole rate, can improve this type of motor control operation scope.

Drawings

Fig. 1 is a schematic structural diagram of a conventional permanent magnet synchronous motor;

FIG. 2 is a schematic structural diagram of a symmetrical pole piece of a prior art electric machine;

FIG. 3 is a graph of self inductance and mutual inductance of a prior art motor;

fig. 4 is a schematic structural view of the motor of the present invention;

fig. 5 is a schematic structural diagram of an asymmetric pole shoe of the motor of the present invention;

fig. 6 is a graph of self inductance and mutual inductance of the motor of the present invention;

fig. 7 is a schematic diagram of thinning a pole shoe of the motor of the present invention;

fig. 8 is a graph of the motor mutual inductance of the present invention with respect to pole shoe thickness hs and slot width bs 0.

Wherein 10 is a stator core, 20 is a rotating shaft, 30 is magnetic steel, 40 is a winding, 101 is a stator main pole, 1011 is a stator pole shoe, and 11 is a notch.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In the permanent magnet synchronous motor, the lower inductance generally means higher rotating speed and faster current response. In addition, when the multi-phase motor fails, the low mutual inductance between phases can prevent the normal phase from continuously generating faults due to the short-circuit phase. The utility model discloses technical scheme is that the symmetry pole shoe through current stator utmost point is asymmetric, makes the iron core coupling degree between the adjacent non-homophase winding reduce to reach and reduce self-inductance and mutual inductive purpose.

As shown in fig. 4, the low mutual inductance motor includes a stator core 10, a rotating shaft 20, magnetic steel 30 and a winding 40, wherein the magnetic steel 30 is assembled on the rotating shaft 20, the stator core 10 is provided with a stator main pole 101, the winding 40 is wound on the stator main pole 101, and a stator pole shoe 1011 on the stator main pole 101 adopts an asymmetric structure.

In which the winding is divided into A, B, C three phases, taking the 10-pole 12-slot motor in fig. 4 as an example, in order to form the maximum electromotive force, 4 coils in the same phase are wound on two adjacent stator poles, as shown in a1 and a 2. Between the stator pole of different looks, enlarge width bs0 of interelectrode notch 11, just can effectively reduce the magnetic circuit coupling degree between the looks and the looks to effectively reduce the mutual inductance between each phase winding 40, reach the utility model discloses a purpose.

The width bs0 of the notch 11 ranges from 0.4 to 1.4 mm. Preferably, the width bs0 of the notch 11 is 0.9 mm.

As shown in fig. 5, the stator pole shoes are changed from symmetrical to asymmetrical pole shoes according to the principle that the slots between different adjacent phases are enlarged, so that different magnetic circuits are formed. In the angular position of the rotor shown in fig. 5, the self-inductance of the a-phase and the mutual inductance of the AB and AC phases are maximized, and the magnetic circuit between the different phases is sparse at the enlarged slot.

As shown in fig. 6, a 12-slot 10-pole motor is taken as an example, the mechanical angle of the rotor of the motor is 0 to 72 degrees, and the self-inductance and the mutual inductance of each phase are within the electrical angle range of 0 to 360 degrees, and fig. 2 shows the self-inductance and the mutual inductance of the motor with a common symmetrical pole shoe structure. Fig. 6 shows the self-inductance and mutual inductance of the asymmetric pole piece motor, wherein the self-inductance is reduced by 20% and the mutual inductance is reduced by 6 times.

Fig. 7 shows another alternative embodiment of a motor with low mutual inductance. Similarly, the pole shoe 1011 thickness hs0 between different adjacent phases is thinned, so that the coupling degree between different phases can be reduced, and the mutual inductance between phases can be reduced.

The thickness hs of the stator pole piece 1011 is in the range of 0.4 to 1.4 mm. Preferably, the thickness hs of the stator pole piece 1011 is 0.9 mm.

As shown in fig. 6, the variation curve of the mutual inductance between the motor phases is shown by increasing the slot width bs0 and reducing the thickness hs of the adjacent phase pole shoe.

Furthermore, the synchronous motor with adjacent windings in the same phase can adopt the technical scheme of the utility model to reduce the mutual inductance between different phases. Such as 9 slots 8 poles, 12 slots 14 poles, etc.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a low mutual inductance motor, includes stator core (10), pivot (20), magnet steel (30) and winding (40), magnet steel (30) assemble on pivot (20), stator core (10) on be equipped with stator owner utmost point (101), winding (40) wind on stator owner utmost point (101), its characterized in that, stator owner utmost point (101) on stator pole shoe (1011) adopt asymmetric structure.

2. A motor of low mutual inductance according to claim 1, c h a r a c t e r i z e d in that the width bs0 of the slots (11) between the stator main poles (101) of adjacent different phases is increased, thereby causing the stator pole shoes (1011) on the stator main poles (101) to become asymmetrical.

3. A motor with low mutual inductance according to claim 2, characterised in that the width bs0 of the slot (11) is in the range 0.4 to 1.4 mm.

4. A motor with low mutual inductance according to claim 3, characterised in that the width bs0 of the slot (11) is preferably 0.9 mm.

5. A low mutual inductance motor according to claim 1, characterised in that the thickness hs of the stator pole pieces (1011) of adjacent different phases is reduced.

6. A motor of low mutual inductance according to claim 5, characterised in that the thickness hs of the stator pole pieces (1011) is in the range 0.4 to 1.4 mm.

7. A motor with low mutual inductance according to claim 6, characterised in that the stator pole shoes (1011) have a thickness hs of preferably 0.9 mm.

8. A low mutual inductance motor according to claim 1, wherein the motor is a 10-pole, 12-slot motor.

9. A low mutual inductance motor according to claim 1, wherein the motor is an 8-pole, 9-slot motor.

10. A low mutual inductance motor according to claim 1, wherein the motor is a 14-pole, 12-slot motor.