CN214959157U - Motor stator - Google Patents

Abstract

The utility model discloses a motor stator, which comprises a stator core formed by laminating a plurality of stator punching sheets, wherein a plurality of stator teeth are arranged on the stator core, and semi-closed pear-shaped stator slots are formed between adjacent stator teeth; wherein, the stator teeth are provided with Hall grooves for mounting Hall magnetic elements; meanwhile, the tooth width of the stator is at least 1.5 times of the yoke height of the stator core; the utility model discloses can obviously offset the stator to the magnetic repulsion force of hall magnetic element, finally can avoid hall magnetic element to be by the ejecting hall groove of stator in motor working process.

Description

Motor stator

Technical Field

The utility model belongs to the motor field, concretely relates to motor stator.

Background

In order to realize the driving control of the motor, a hall magnetic element is generally required to be arranged on a motor stator and used for sensing and calculating the position of a rotor; however, since the hall magnetic elements mounted on the teeth of the stator are affected by the electromagnetic force of the stator, the hall magnetic elements may be ejected due to the repulsive force during the operation of the motor, which may eventually cause the motor to malfunction.

Based on the research experience of the utility model, the applicant hopes to seek technical solution to improve the above technical problems.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a motor stator can obviously offset the magnetic repulsion force of stator to hall magnetic element, finally can avoid hall magnetic element to be ejecting hall groove by the stator in motor working process.

The technical scheme of the utility model as follows:

a motor stator comprises a stator core formed by laminating a plurality of stator punching sheets, wherein a plurality of stator teeth are arranged on the stator core, and semi-closed pear-shaped stator slots are formed between adjacent stator teeth; the stator teeth are provided with Hall grooves for mounting Hall magnetic elements; while the stator tooth width is at least 1.5 times the stator core yoke height.

Preferably, the side of the stator tooth is in a bevel shape, wherein the width of the stator tooth near the inner circumference of the stator core is larger than the width of the stator tooth near the outer circumference of the stator core, and the minimum width of the stator tooth is at least 1.5 times the height of the stator core yoke.

Preferably, the included angle between the side edges of the stator teeth is 3-5 degrees.

Preferably, the center of the hall groove coincides with the center of the stator tooth.

Preferably, a first hall groove, a second hall groove and a third hall groove for mounting the hall magnetic elements are respectively arranged on the adjacent three stator teeth.

Preferably, the hall groove is provided with a conical notch for improving the embedding stability of the hall magnetic element.

Preferably, the number of the stator teeth is 12.

Preferably, the angle between adjacent Hall slots is 25-40 °.

Preferably, the stator core yoke height is in the range of 6-10 mm.

Preferably, the stator tooth width is 1.8-2.2 times the stator core yoke height.

This application increases the motor stator structural design of stator tooth width, effectively increases stator core's Br value, verifies through the experiment, can obviously offset the stator to the magnetic repulsion force of hall magnetic element, finally can avoid hall magnetic element to be by the ejecting hall groove of stator in motor working process.

Drawings

FIG. 1 is a diagram of a single-wire multilayer winding distribution structure of a 54-slot motor in example 1 of the present application;

FIG. 2 is a three-phase winding wiring diagram of the 54-slot machine of FIG. 1;

fig. 3 is a structure diagram of a single-wire multilayer winding distribution of a 12-slot motor in embodiment 2 of the present application;

FIG. 4 is a three-phase winding wiring diagram of the 12-slot machine of FIG. 3;

fig. 5 is a schematic structural view of a 12-slot 10-pole motor in embodiment 3 of the present application;

fig. 6 is a schematic view of the structure of the stator core of fig. 5;

FIG. 7 is a schematic view of the rotor of FIG. 5;

FIG. 8 is a schematic structural view of the rotor core of FIG. 7;

fig. 9 is a schematic structural view of a stator core in embodiment 4 of the present application.

Detailed Description

The embodiment of the utility model discloses a motor stator, which comprises a stator core formed by laminating a plurality of stator punching sheets, wherein a plurality of stator teeth are arranged on the stator core, and semi-closed pear-shaped stator slots are formed between adjacent stator teeth; wherein, the stator teeth are provided with Hall grooves for mounting Hall magnetic elements; while the stator tooth width is at least 1.5 times the stator core yoke height.

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

Example 1: referring to fig. 1 and 2, a single-wire multilayer winding distribution structure of a motor includes a stator and a rotor wound with three-phase (including U-phase, V-phase, and W-phase) windings, where in this embodiment, the windings are copper wire windings, and the three-phase windings are connected in a star connection (or in a delta connection); the stator is provided with 48 slots, the number of slots of each phase of winding in the stator is 16 (2a, where a is 8), and each phase of winding adopts 2 (n is 2) winding basic units with a 2-layer-3-layer distribution structure, that is, each winding basic unit adopts 2-3-layer-2-3-layer distribution, and the number of the winding basic units in the embodiment is 12; the 2-layer-3-layer-2-layer-3-layer distribution structure in the present embodiment means that on the first stator tooth 11a, the second stator tooth 11b, the third stator tooth 11c, and the fourth stator tooth 11d arranged in this order, a single-wire winding is wound on the first stator tooth 11a and the third stator tooth 11c in a double-layer manner, and a single-wire winding is wound on the second stator tooth 11b and the fourth stator tooth 11d in a double-layer manner, and the 2-layer or 3-layer winding wound on the four stator teeth 11a,11b,11c,11d is referred to as a winding basic unit 12; of course, in other embodiments, a and n may also be other positive integer values, as long as a/n is ensured to be a positive integer equal to or greater than 1, and the technical effects of the present application may be similarly achieved, and particularly preferably, in other embodiments, n may be set to be n-1 or n-3;

preferably, in order to achieve fast winding and facilitate the slot filling rate, in the present embodiment, the double-layer winding 12a on the stator tooth 11 is formed by winding a single wire at one time, and the three-layer winding 12b on the stator tooth 11 is also formed by winding a single wire at one time;

preferably, the embodiment also provides a high-performance motor, which adopts the single-wire multilayer winding distribution structure and is applied to a motor for an electric vehicle.

Example 2: the remaining technical solutions of this embodiment 2 are the same as those of embodiment 1, except that, referring to fig. 3 and fig. 4, the stator has 12 slots, the number of slots of each phase of winding in the stator is 4 (2a, where a is 6), and each winding basic unit 22 is also distributed in a 2-3-layer-2-3-layer manner, and the number of winding basic units 22 in this embodiment is 3; the double-layer winding 12a 'on the stator teeth 21 is formed by winding a single wire at one time, and the three-layer winding 12 b' on the stator teeth 21 is also formed by winding a single wire at one time.

In order to realize the driving control of the motor, a hall magnetic element is generally required to be arranged on a motor stator and used for sensing and calculating the position of a rotor; however, since the hall magnetic elements mounted on the stator teeth 21 are affected by the electromagnetic force of the stator, the hall magnetic elements may be ejected by repulsive force during the operation of the motor, which may eventually cause the motor to malfunction, and for this reason, the present application further proposes the following embodiment 3.

Example 3: in this embodiment 3, the single-wire multilayer winding distribution structure in the above embodiment 2 is applied as a high-performance motor for an electric vehicle, please refer to fig. 5 and 6 in combination, where a motor stator 20 includes a stator core 20 'formed by laminating a plurality of stator laminations, 12 stator teeth 21 are disposed on the stator core 20', and a semi-closed pear-shaped stator slot 22 is formed between adjacent stator teeth 21; wherein, the stator teeth 21 are provided with hall grooves for mounting hall magnetic elements (known structure, not shown);

preferably, in the present embodiment, the stator tooth width t1 is at least 1.5 times the stator core yoke height h1, and the side edges of the stator teeth 21 are in the form of inclined planes, wherein the stator tooth width t1 in the direction close to the inner circumference of the stator core 20 'is greater than the stator tooth width in the direction close to the outer circumference of the stator core 20', and the minimum stator tooth width t1 is at least 1.5 times the stator core yoke height h 1; the included angle a1 between the side edges of the stator teeth 21 is 3-5 degrees, and the Br value of the stator iron core 20' can be further effectively increased on the basis of not changing the external dimension of the stator through the structural design;

preferably, in order to facilitate the hall magnetic element installation, in the present embodiment, a first hall groove 23a, a second hall groove 23b and a third hall groove 23c for installing the hall magnetic element are respectively arranged on adjacent three stator teeth 21, and an angle a2 between adjacent hall grooves 23a, 23b and 23c is 25-40 °; specifically, the center of each hall groove 23a, 23b, 23c coincides with the center of the stator tooth 21 where the hall groove is located, the angle a2 between the adjacent hall grooves 23a, 23b, 23c is 30 °, and each hall groove 23a, 23b, 23c is provided with a tapered notch 24 for improving the stability of the hall magnetic element embedded in the hall grooves 23a, 23b, 23c, preferably, the depth of each hall groove 23a, 23b, 23c may be in the range of 1-5mm, of course, in order to facilitate the stability of installation, other suitable depth ranges may also be adopted, which is not particularly limited in this embodiment;

preferably, the stator core yoke height h1 is in the range of 6-10mm and the minimum stator tooth width t1 is 1.8-2.2 times the stator core yoke height h 1.

This embodiment 3 is through the motor stator 20 structural design who increases stator tooth width t1, effectively increases stator core 20's Br value, verifies through the experiment, can obviously offset the magnetic repulsion force of stator tooth 21 to hall magnetic element, can avoid hall magnetic element to be ejecting hall groove by the stator tooth at motor working process finally.

Referring to fig. 7 and 8 in a further combination, in the present embodiment, the motor rotor 30 includes a rotor core 31 formed by laminating a plurality of rotor sheets, the rotor core 31 is installed on the inner periphery of the motor stator 20, 10 closed-end rotor slots 32 are circumferentially spaced on the rotor core 31, and a V-shape is formed between adjacent closed-end rotor slots 32; permanent magnets 33 are embedded in each closed rotor slot 32; the remanence Br of the permanent magnet 33 is larger than 1.6T, while the thickness of the permanent magnet 33 ranges from 1.5 to 4 mm.

Preferably, in this embodiment, the rotor core 31 includes a plurality of main arc-shaped rotor core segments 31a and a plurality of inner bending-type rotor core segments 31b, the main arc-shaped rotor core segments 31a and the inner bending-type rotor core segments 31b are alternately integrated or separately connected to each other to form a closed arc shape, and the outer end of the closed-mouth-shaped rotor slot 32 corresponds to the inner bending-type rotor core segments 31b, so as to further facilitate the field weakening effect of the motor.

Preferably, in the present embodiment, the rotating shaft hole 31c of the rotor core 31 is fixedly integrated with the rotating shaft 40; a plurality of lightening slots 34 which are distributed at intervals on the circumference are arranged on the rotor core 31 which is positioned between the rotor slot 32 and the rotating shaft hole 31 c; particularly preferably, the lightening slots 34 are shaped as a fan.

Preferably, in order to improve the electromagnetic performance of the motor, the remanence Br of the permanent magnet 33 in the embodiment ranges from 1.8T to 2.1T, and the thickness of the permanent magnet 33 ranges from 1.8 mm to 2.2 mm.

This embodiment 3 is still through selecting for use high-grade magnet steel as the material of permanent magnet 33, through selecting for use the permanent magnet structure who has excellent weak magnetic property to inlay dress type V type permanent magnet 33 mounting structure as electric motor rotor 30, it is verified through the experiment, the work efficiency of motor can effectively be increased to this structure, electric motor rotor 30 in this embodiment cooperates with the motor stator 20 structure of high stator tooth width t1 back simultaneously, can further eliminate stator tooth 21 to the produced repulsion force of hall magnetic component, stop hall magnetic component ejecting in motor working process.

Considering that the motor proposed in embodiment 3 may have special requirements on the structure of the stator 20 and the rotor 30, which may limit the technical effects thereof in practical applications, the present application further proposes the following embodiment 4 in order to make the motor not limited by the relevant special structure, and at the same time, to prevent the hall magnetic elements from being ejected by the stator 20 of the motor.

Example 4: a motor capable of avoiding Hall magnetic elements from falling off comprises a stator and a rotor, please refer to fig. 9, wherein the stator comprises a stator core 40 formed by laminating a plurality of stator punching sheets, a plurality of stator teeth 41 are arranged on the stator core 40, and semi-closed stator slots 42 are formed between adjacent stator teeth 41; an A-shaped Hall groove for mounting Hall magnetic elements is arranged at a stator notch 43 between adjacent stator teeth 41, and the Hall magnetic elements are fixedly embedded in the A-shaped Hall groove 44;

preferably, in the present embodiment, a first a-type hall groove 44a, a second a-type hall groove 44b, and a third a-type hall groove 44c for fixedly embedding hall magnetic elements are respectively provided between the adjacent four stator teeth 41a, 41b, 41c, 41 d; the center of each a-type hall slot 44a, 44b, 44c coincides with the center of the corresponding stator slot opening 43; preferably, for the convenience of mounting the hall magnetic element, the angle between the adjacent a-type hall grooves 44a, 44b, 44c is 25 to 40 °, and further preferably, in the present embodiment, the depth of each a-type hall groove 44a, 44b, 44c is in the range of 1 to 5mm, and each a-type hall groove 44a, 44b, 44c is provided with a tapered notch 44d for improving the mounting stability of the hall magnetic element.

This embodiment 4 proposes to inlay the hall magnetic element is fixed inlays at a type hall groove 44a, 44b, 44c (be located the stator notch 43 department between adjacent stator tooth 41), and through the experiment detection, when being located this mounted position, the stator electromagnetic repulsion effort that the hall magnetic element received is little, can not lead to the problem that the hall magnetic element was ejected, avoids the hall magnetic element to drop.

In this embodiment 4, the motor in embodiment 3 may be directly adopted as the other technical solutions of the motor, and the motor stator may also include the hall slots 23a, 23B, and 23c (i.e., B-type hall slots) directly disposed on the stator teeth, and in actual use, a person skilled in the art may select the installation position of the hall magnetic elements according to actual needs, and may fixedly insert all hall magnetic elements in the a-type hall slots 44a, 44B, and 44c, or may fixedly insert all hall magnetic elements in the B- type hall slots 23a, 23B, and 23c, or of course may fixedly insert part of the hall magnetic elements in the a-type hall slots, and install the other hall elements in the B-type hall slots, which may further increase the flexibility of hall magnetic element installation. Referring directly to fig. 9, in order to facilitate quick installation and installation, it is preferable that the a-type hall grooves 44a, 44B, 44c and the B- type hall grooves 23a, 23B, 23c are alternately arranged.

It should be further noted that the number of the hall slots in the embodiment of the present application may be actually set according to the number of hall magnetic elements to be installed, and is not limited to the number of the hall slots used in the embodiment of the present application.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A motor stator is characterized by comprising a stator core formed by laminating a plurality of stator punching sheets, wherein a plurality of stator teeth are arranged on the stator core, and semi-closed pear-shaped stator slots are formed between adjacent stator teeth; the stator teeth are provided with Hall grooves for mounting Hall magnetic elements; while the stator tooth width is at least 1.5 times the stator core yoke height.

2. The electric machine stator of claim 1, wherein the sides of the stator teeth are beveled, wherein the width of the stator teeth near the inner circumference of the stator core is greater than the width of the stator teeth near the outer circumference of the stator core, and wherein the minimum stator tooth width is at least 1.5 times the yoke height of the stator core.

3. A stator for an electrical machine according to claim 2, wherein the included angle between the sides of the stator teeth is 3-5 °.

4. The electric machine stator of claim 1, wherein the center of the hall slot coincides with the center of the stator tooth.

5. The stator of claim 1, wherein adjacent three stator teeth have a first hall slot, a second hall slot, and a third hall slot for mounting the hall magnetic elements thereon.

6. The stator as claimed in claim 1 or 5, wherein the hall slot is provided with a tapered slot opening for improving insertion stability of the hall magnetic element.

7. The electric machine stator of claim 1, wherein the number of stator teeth is 12.

8. The stator of claim 5 wherein the angle between adjacent Hall slots is 25-40 °.

9. The electric machine stator of claim 1, wherein the stator core yoke height is in the range of 6-10 mm.

10. The electric machine stator of claim 9, wherein the stator tooth width is 1.8-2.2 times the stator core yoke height.

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