CN218771457U

CN218771457U - Stator punching sheet, motor and compressor

Info

Publication number: CN218771457U
Application number: CN202223152316.1U
Authority: CN
Inventors: 倪伟; 孙建龙
Original assignee: Shanghai Highly Electrical Appliances Co Ltd
Current assignee: Shanghai Highly Electrical Appliances Co Ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-03-28
Anticipated expiration: 2032-11-25

Abstract

The utility model provides a stator punching sheet, a motor and a compressor, wherein the stator punching sheet is formed by splicing a plurality of punching sheet units, each punching sheet unit comprises a yoke unit and a tooth part unit radially arranged on one side of the yoke unit; the yoke unit is annularly assembled and fixed to form an annular yoke; a stator slot is formed between every two adjacent tooth parts, the stator slot is provided with a notch, the width of the notch is w, and w is more than or equal to 0 and less than or equal to 1.5mm; the utility model discloses do benefit to and improve the undulant and motor noise vibration problem of moment of torsion that receives the tooth's socket torque influence.

Description

Stator punching sheet, motor and compressor

Technical Field

The utility model relates to a compressor technical field, specifically speaking relates to a stator punching, motor and compressor.

Background

The stator of the current concentrated winding motor is generally of an open slot structure, and the open slot motor is used as a main stream concentrated winding motor topological structure and is widely applied to the existing compressor driving motor. In which the stator generally adopts an open slot structure, so that when the magnet passes through each stator slot, a gap between the stator and the rotor generates discontinuous magnetic permeability to generate cogging torque, resulting in vibration and noise of the motor.

The cogging torque is torque generated by changing the air gap permeance between the stator and rotor cores due to the interaction between the magnetic field generated by the permanent magnet and the stator and rotor cores of the compressor motor, and the cogging torque influences the pulsation, noise and performance control system of the output torque of the motor. When the open slot is large, the cogging torque will also be large, which will adversely affect the stability of the output torque.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a stator punching sheet, motor and compressor does benefit to and improves the undulant and motor noise vibration problem of moment of torsion that receives the cogging torque effect influence.

According to one aspect of the utility model, a stator punching sheet is provided, which is formed by splicing a plurality of punching sheet units, each punching sheet unit comprises a yoke part unit and a tooth part unit radially arranged on one side of the yoke part unit; the yoke unit is annularly assembled and fixed to form an annular yoke; a stator slot is formed between every two adjacent tooth parts, the stator slot is provided with a notch, the width of the notch is w, and w is more than or equal to 0 and less than or equal to 1.5mm.

Optionally, a plurality of groups of stator slot combinations are formed on the stator punching sheet, and each group of stator slot combinations includes 3 continuous stator slots.

Optionally, the slot widths of at least two of the 3 stator slots included in each stator slot group are not equal.

Optionally, the notch widths of the 3 stator slots included in each group of stator slot combination are a1, a2 and a3 in sequence, and a3 ≦ a2 ≦ a1.

Optionally, the tooth unit comprises a tooth shoe part and a tooth body part which are connected, the width of the tooth body part is t, and the radial height of the notch is h ₁ The radial height of the tooth boot part is h ₂ The number of the stator slot combinations is N, the inner diameter of the stator punching sheet is Di, the sum of the widths of the tooth boots included in each tooth unit is s, and the radial height of the stator slot is H, so that the following requirements are met:

and->

Optionally, each group contains 3 stator slots, the width of the slot opening in the slot opening is m, the tooth unit comprises a tooth shoe part and a tooth body part which are connected, the width of the tooth body part is t, and the radial height of the slot opening is h ₁ The radial height of the tooth boot part is h ₂ The number of the stator slot combinations is N, the inner diameter of the stator punching sheet is Di, the sum of the widths of the tooth boots contained in each tooth unit is s, and the following requirements are met:

and m is<s。

Optionally, the number of stator slot combinations is 2, 3, 4 or 6.

Optionally, the radial height of the stator slot is H, and the sum s of the widths of the tooth shoes included in each tooth unit further satisfies

Optionally, the yoke unit is in snap-fit with the tooth unit.

Optionally, a recessed portion is formed in an inner circumferential surface of the yoke unit, which is in contact with the tooth unit, at least one protruding portion is formed on an end surface of the tooth unit, which is in contact with the yoke unit, and the protruding portion is clamped in the recessed portion, so that the tooth unit is clamped in the yoke unit;

according to the utility model discloses a further aspect provides a motor, including stator core, stator core includes any stator punching of above-mentioned.

According to another aspect of the present invention, a compressor is provided, which includes the above-mentioned motor.

Compared with the prior art, the utility model beneficial effect lie in:

the utility model provides a stator is towards piece, motor and compressor adopts modularization stator towards piece design, and the stator is towards the piece unit concatenation by the polylith and is formed, combines magnetic field to seek optimality, establishes the notch width of stator slot into less than or equal to 1.5mm, reaches the effect of closed slot towards the piece basically, reduces the tooth's socket torque that produces, does benefit to and improves the undulant and motor noise vibration problem of moment of torsion that receives the influence of tooth's socket torque, strengthens the stability of output torque.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural diagram of a stator punching disclosed in an embodiment of the present invention;

fig. 2 is a schematic structural view of a part of punching units in a stator punching sheet disclosed in an embodiment of the present invention in an undeployed state;

fig. 3 is a schematic structural view of a part of punching units in a stator punching sheet in an expanded state according to an embodiment of the present invention;

fig. 4 is another schematic structural diagram of a stator lamination according to an embodiment of the present invention after connection of a part of lamination units;

fig. 5 is a schematic diagram for comparing the effect of the stator punching sheet provided by the present application on output torque ripple with that of the prior art.

Reference numerals

11. A punching unit; 12. a yoke unit; 13. a tooth unit; 14. a stator slot; 15. a notch; 16. a tooth shoe portion; 17. a tooth body part;

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, materials, devices, etc. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

The terms "a", "an", "the", "above" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising," "having," and "providing" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

As shown in fig. 1, the utility model discloses a stator punching sheet. The stator punching sheet is formed by splicing a plurality of punching sheet units 11. Therefore, the punching units 11 can be unfolded and spliced in a surrounding manner, that is, the punching units 11 in the stator punching have an undeployed state (refer to fig. 2) and a deployed state (refer to fig. 3). After the punching sheet unit 11 is unfolded, enameled wire winding operation can be conveniently carried out on the stator teeth, the winding operation efficiency is improved, and meanwhile, the product quality is improved.

Each of the punching units 11 includes a yoke unit 12 and a tooth unit 13 radially provided on one side of the yoke unit 12. The yoke unit 12 is fixed to the annular yoke by ring-jointing. A stator slot 14 is formed between two adjacent tooth units 13, and the stator slot 14 has a slot opening 15. The width of the notch 15 is w, wherein w is more than or equal to 0 and less than or equal to 1.5mm. Fig. 1 exemplarily shows 12 punching units 11. The utility model discloses do not do the injecing to every stator towards the quantity of piece unit 11 in the piece.

The utility model discloses seek the optimization with the notch 15 width and the magnetic field of stator slot 14 and combine, establish the notch 15 width of stator slot 14 into less than or equal to 1.5mm, reach the effect of closed groove punching basically, do benefit to the undulant and motor noise vibration problem of moment of torsion that the improvement received the cogging effect influence, the stability of reinforcing output torque. When the groove width is 0, the closed groove is designed.

In this embodiment, a plurality of groups of stator slot combinations are formed on the stator punching sheet, and each group of stator slot combination includes 3 continuous stator slots 14; i.e. one group of every 3 consecutive stator slots 14. That is, the stator core that this stator punching was made is used for twining the three-phase line. Exemplarily, for example, referring to fig. 2, two stator slots 14 and 3 punching units 11 are shown. Wherein, the widths of the slot openings 15 of the 3 stator slots 14 in each group of stator slot combination can be equal or unequal. In an alternative embodiment, the widths of the slot openings 15 of at least two stator slots 14 in 3 stator slots 14 in each group of stator slot combinations are not equal; this is advantageous in optimizing the magnetic permeability created by the gap between the stator and rotor as the magnets in the motor pass through each stator slot 14, making the magnetic permeability tend to be continuous, reducing the cogging torque produced, and contributing to enhancing the stability of the motor output torque.

If the number of stator slot combinations is represented by N, the number of stator slots 14 is 3N in this embodiment. In a preferred embodiment, N is a natural number 2, 3, 4 or 6.

In another alternative embodiment, referring to FIG. 4, the widths of the slots 15 of the 3 stator slots 14 in each set of stator slot combination are a1, a2 and a3 in sequence, and a3 ≦ a2 ≦ a1. In a preferred embodiment, a3, a2 and a1 are sequentially increased. Therefore, magnetic field optimization is combined, the width of the notch 15 of the stator slot 14 is adjusted, the stator slot 14 has lower magnetic flux density, and the motor achieves optimal output torque fluctuation and torque constant, so that the stability of the output torque of the motor is enhanced.

In an alternative embodiment of the present invention, referring to fig. 3, the tooth unit 13 includes a tooth shoe portion 16 and a tooth body portion 17 connected to each other. The tooth shoe portions 16 are two extending portions formed by extending along the inner side end portion of the tooth body portion 17 in the circumferential direction of the stator punching sheet in the two directions. Each of the body portions 17 is formed with one tooth shoe 16 on each side thereof. Referring to fig. 4, the width of the tooth body 17 is t, and the radial height of the notch 15 is h ₁ The tooth shoe portion 16 has a radial height h ₂ The number of the stator slot combinations is N, the inner diameter of the stator lamination is Di, the sum of the widths of the tooth shoes 16 included in each tooth unit 13 is s, and the radial height of the stator slot 14 is H, which satisfies:

and->

Therefore, the range of the sum of the widths of the tooth boots 16 on the tooth unit 13 is adjusted by combining the inner diameter Di of the stator punching sheet and the radial height of the stator slots 14, so that the stator slots 14 have lower magnetic flux density, the generated cogging torque is reduced, and the stability of the output torque of the motor is favorably enhanced. The inner diameter Di of the stator lamination refers to the diameter of the inner periphery of the stator lamination.

In another alternative embodiment of the present invention, the maximum value of the width of the slot opening 15 of the 3 stator slots 14 in each stator slot assembly is m, the tooth unit 13 comprises a tooth shoe portion 16 and a tooth body portion 17 connected to each other, the width of the tooth body portion 17 is t, and the radial height of the slot opening 15 is h ₁ The tooth shoe portion 16 has a radial height h ₂ The number of the stator slot combinations is N, the inner diameter of the stator punching sheet is Di, the sum of the widths of the tooth shoe parts 16 included in each tooth unit 13 is s, and the following conditions are satisfied:

and s>m。

Taking the widths a1, a2 and a3 of the notches 15 of the 3 stator slots 14 in the stator slot combination as an example, the above m is the maximum value among a1, a2 and a 3. Therefore, on one hand, the winding operation of the enameled wire in the stator slot 14 is facilitated, and the winding efficiency is improved; on the other hand, by adjusting the width of the air gap of the stator slot 14, the magnetic permeability generated by the gap between the stator and the rotor when the magnet in the motor passes through each stator slot 14 is optimized, so that the magnetic permeability tends to be continuous, the generated cogging torque is reduced, and the stability of the output torque of the motor is favorably enhanced.

In a preferred embodiment, the sum s of the inner diameter Di of the stator lamination, the radial height H of the stator slots 14, the maximum m of the widths of the slots 15 of the stator slots 14, the number N of stator slot combinations, and the width of the tooth shoe 16 in the tooth unit 13 satisfies:

therefore, by adjusting the width of the air gap of the stator slot 14, the magnetic conductivity generated by the gap between the stator and the rotor is optimized, the effect of reducing the cogging torque is achieved, and the problem of motor output torque fluctuation is solved.

Referring to fig. 5, motor output torque ripple curves corresponding to the present application and the prior art, respectively, are shown. As can be seen from fig. 5, the output torque of the motor of the present application fluctuates less, i.e., the output torque of the motor is more stable.

In another alternative embodiment of the present invention, the yoke unit 12 is engaged with the tooth unit 13 (not shown in the drawings). Specifically, for example, a concave portion is provided on an inner peripheral surface of the yoke unit 12 that contacts the tooth unit 13, and at least one convex portion is provided on an end surface of the tooth unit 13 that contacts the yoke unit 12. The convex portion is engaged with the concave portion, so that the tooth portion unit 13 is engaged with the yoke portion unit 12. Therefore, the annular yoke parts with the same size can be matched with a plurality of tooth part units 13 with different sizes, when the inner diameter of the stator needs to be changed, only the tooth part units 13 need to be changed, the annular yoke parts do not need to be changed, the operation is convenient, and the change efficiency is high; the cost of replacing the stator punching sheet is lower.

In an optional embodiment, the yoke unit 12 is a chain connection structure, and can be punched out by a die and buckled into a chain iron core, and the upper yoke unit 12 is in a long strip shape in an extended state, which is beneficial to improving the material utilization rate in the process of punching and manufacturing the stator punching sheet.

The embodiment of the utility model provides a still provide a motor, this motor includes stator core, and this stator core includes the stator punching of a plurality of above-mentioned arbitrary embodiment descriptions. In this embodiment, the stator core has a modular structure. In the production process, a plurality of punching sheet units 11 can be stacked to form a T-shaped iron core module, and then the teeth of the T-shaped iron core module are wound to form the stator module. All stator modules are assembled around a circle to form a stator assembly. Therefore, the stator assembly includes a stator core and a stator winding. The stator core is composed of a circle of T-shaped iron core modules. The coil winding area of a single tooth part is larger than that of the integrally formed stator core, so that the reduction of the copper loss of the motor is facilitated, and the motor efficiency is improved. The detailed structural features and advantages of the stator punching sheet can refer to the description of the above embodiments, and are not described again here.

The embodiment of the utility model provides a still provide a compressor, this compressor includes the motor that above-mentioned embodiment is disclosed.

It should be noted that, since the width of the slot 15 of the stator slot 14 of the present invention is small, the slot 15 of the stator slot 14 is close to the closed slot design in the view of fig. 1, 2 and 4 in the attached drawings, but actually, the slot 15 of the stator slot 14 in fig. 1, 2 and 4 is opened.

To sum up, the utility model discloses a stator punching, motor and compressor have following advantage at least:

the utility model discloses a stator punching, motor and compressor adopt modularization stator towards the piece design, and the stator punching is formed by polylith towards the concatenation of piece unit, combines magnetic field to seek advantages, establishes the notch width of stator slot for less than or equal to 1.5mm, reaches the effect of closed slot towards the piece basically, reduces the tooth's socket torque that produces, does benefit to improve the undulant and motor noise vibration problem of moment of torsion that receives the tooth's socket effect influence, strengthens the stability of output torque.

In the description of the present invention, it is to be understood that the terms "bottom", "longitudinal", "lateral", "up", "down", "front", "back", "vertical", "horizontal", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the structures or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more and "several" means one or more unless otherwise specified.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. The stator punching sheet is characterized by being formed by splicing a plurality of punching sheet units (11), wherein each punching sheet unit (11) comprises a yoke unit (12) and a tooth unit (13) which is radially arranged on one side of the yoke unit (12); the yoke units (12) are annularly spliced and fixed to form an annular yoke; a stator slot (14) is formed between every two adjacent tooth units (13), the stator slot (14) is provided with a notch (15), the width of the notch (15) is w, and w is more than or equal to 0 and less than or equal to 1.5mm.

2. The stator lamination as recited in claim 1, wherein a plurality of groups of stator slot combinations are formed on the stator lamination, and each group of stator slot combinations comprises 3 continuous stator slots (14).

3. The stator punching sheet according to claim 2, wherein the widths of the slot openings (15) of at least two stator slots (14) in the 3 stator slots (14) included in each group of stator slot combination are not equal.

4. The stator punching sheet according to claim 2, wherein the widths of the notches (15) of the 3 stator slots (14) included in each group of stator slot combination are a1, a2 and a3 in sequence, and a3 is larger than or equal to a2 and smaller than or equal to a1.

5. The stator punching sheet according to claim 2, wherein the tooth part unit (13) comprises a tooth shoe part (16) and a tooth body part (17) which are connected, the width of the tooth body part (17) is t, and the radial height of the notch (15) is h ₁ The tooth shoe (16) has a radial height h ₂ The number of the stator slot combinations is N, the inner diameter of the stator punching sheet is Di, the sum of the widths of the tooth boots (16) contained in each tooth unit (13) is s, and the radial height of the stator slot (14) is H, so that the following requirements are met:

and->

6. Stator lamination according to claim 2, characterized in that the maximum value of the width of the slot opening (15) in each group of 3 stator slots (14) is m, the tooth unit (13) comprises a tooth shoe part (16) and a tooth body part (17) which are connected, the width of the tooth body part (17) is t, and the radial height of the slot opening (15) is h ₁ The tooth shoe (16) has a radial height h ₂ The number of the stator slot combinations is N, the inner diameter of the stator punching sheet is Di, the sum of the widths of tooth boots (16) contained in each tooth unit (13) is s, and the following requirements are met:

and m is<s。

7. The stator lamination as recited in claim 2, wherein the number of stator slot combinations is 2, 3, 4 or 6.

8. Stator lamination according to claim 6, wherein the radial height of the stator slots (14) is H, and the sum s of the widths of the tooth shoes (16) included in each tooth unit (13) also satisfies

9. The stator lamination according to claim 1, wherein the yoke unit (12) is clamped with the tooth unit (13).

10. The stator punching sheet according to claim 9, wherein an inner circumferential surface of the yoke unit (12) contacting the tooth unit (13) is provided with a recess, and an end surface of the tooth unit (13) contacting the yoke unit (12) is provided with at least one protrusion, and the protrusion is clamped in the recess so that the tooth unit (13) is clamped in the yoke unit (12).

11. An electric machine comprising a stator core comprising a plurality of stator laminations as claimed in any one of claims 1 to 10.

12. A compressor, characterized by comprising an electric machine according to claim 11.