Motor stator and permanent magnet motor and compressor containing same
By designing interlaced auxiliary grooves on the motor stator, the cogging torque is weakened, the problem of high motor operation noise is solved, and the effect of reducing motor vibration noise is achieved.
Patent Information
- Application Number
- CN202420635100.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-03-29
AI Technical Summary
During operation, existing motors have large amounts of electromagnetic harmonics in the air gap, which leads to high noise and cannot meet the low-noise operating conditions.
A motor stator is designed, including a plurality of stacked stator punches, and the first and second auxiliary grooves are opened on the stator punches, and the auxiliary grooves are staggered on the radial inner side of the tooth boot portion, which weakens the cogging torque and reduces the vibration noise of the motor.
By weakening the cogging torque, the vibration noise of the motor is reduced, and the use of low noise is met. At the same time, the problems of large air gap spacing and reduced back potential caused by excessive auxiliary grooves are avoided.
Smart Images
Figure CN222735879U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of motors, in particular to a motor stator and a permanent magnet motor and a compressor comprising the same. Background Art
[0002] With the development of society, the market's requirements for compressors are no longer limited to performance, cost and other utility models, and the demand for low noise is also growing. As an important energy conversion device, the motor is widely used in various production machinery and equipment driven by the motor. The motor realizes the conversion of electromagnetic energy to mechanical energy through the air gap. However, when the motor is running, there are a large number of electromagnetic harmonics in the air gap, which causes the motor to have poor noise and cannot meet the working conditions.
[0003] In view of the above defects, the utility model proposes a new motor stator and a permanent magnet motor and a compressor comprising the same. Utility Model Content
[0004] The utility model aims to provide a motor stator and a permanent magnet motor and a compressor containing the same, improve the structure of the motor stator and reduce the running noise of the motor.
[0005] The utility model solves the above technical problems through the following technical solutions:
[0006] The utility model provides a motor stator, comprising a plurality of stacked stator punching sheets; the radial inner side of the motor stator is provided with stator teeth, and the radial inner side of the stator teeth is formed with symmetrical tooth boots;
[0007] The stator punching sheet includes a plurality of first stator punching sheets and a plurality of second stator punching sheets, the first stator punching sheet is arranged at the upper part of the motor stator and has a first auxiliary opening, and the plurality of the first auxiliary openings are stacked to form a first auxiliary slot from top to bottom; the second stator punching sheet is arranged at the lower part of the motor stator and has a second auxiliary opening, and the plurality of the second auxiliary openings are stacked to form a second auxiliary slot from bottom to top; the first auxiliary slot and the second auxiliary slot are staggered and are both formed on the radial inner surface of the tooth shoe portion, and the center line of the first auxiliary slot and the center line of the second auxiliary slot are symmetrically distributed about the symmetry axis of the tooth shoe portion.
[0008] In this technical solution, the motor stator generally has slots for winding on the inside to generate cogging torque, which deteriorates the order of the electromagnetic force wave. At the same time, the vibration deformation generated by the motor stator in the radial direction is the main source of electromagnetic noise. The auxiliary slots on the motor stator weaken the cogging torque, thereby reducing the spatial low-order components of the radial electromagnetic force wave, thereby reducing the vibration noise of the motor. Too many auxiliary slots will increase the actual size of the air gap spacing, thereby reducing the motor back electromotive force, so only two auxiliary slots are designed.
[0009] Preferably, the stator punching sheet also includes a third stator punching sheet, which is located between the first stator punching sheet and the second stator punching sheet, and the first auxiliary opening and the second auxiliary opening are formed on the third stator punching sheet, and the bottom of the first auxiliary slot is lower than the top of the second auxiliary slot in the axial direction of the motor stator.
[0010] In the technical solution, the bottom of the first auxiliary slot goes over the top of the second auxiliary slot in the axial direction of the motor stator, so that the distortion of the electromagnetic force wave of a specific order is reduced.
[0011] Preferably, the stator punching sheet also includes a third stator punching sheet, and the third stator punching sheet is located between the first stator punching sheet and the second stator punching sheet. The first auxiliary opening and the second auxiliary opening are not provided on the third stator punching sheet, and the bottom of the first auxiliary slot is higher than the top of the second auxiliary slot in the axial direction of the motor stator.
[0012] In the technical solution, the bottom of the first auxiliary slot is spaced apart from the top of the second auxiliary slot in the axial direction of the motor stator, so that the distortion of the electromagnetic force wave of a specific order is reduced.
[0013] Preferably, the length of the first auxiliary groove is L1, the length of the second auxiliary groove is L2, and 0.85≤L1 / L2≤1.15.
[0014] In this technical solution, the lengths of the two auxiliary slots are kept in an appropriate proportion to improve the waveform of the electromagnetic force wave.
[0015] Preferably, the width of the first auxiliary groove is W1, the width of the second auxiliary groove is W2, and 0.9≤W1 / W2≤1.1.
[0016] In the technical solution, the widths of the two auxiliary grooves are kept in an appropriate proportion to improve the waveform of the electromagnetic force wave.
[0017] Preferably, a depth of the first auxiliary slot in the radial direction of the motor stator is H1, a depth of the second auxiliary slot in the radial direction of the motor stator is H2, and 0.8≤H1 / H2≤1.2.
[0018] In the technical solution, the depths of the two auxiliary slots in the radial direction of the motor stator are kept in an appropriate proportion, thereby improving the waveform of the electromagnetic force wave.
[0019] Preferably, the first auxiliary groove and the second auxiliary groove are any one of a semicircular groove, a rectangular groove, a trapezoidal groove or a triangular groove.
[0020] In this technical solution, the auxiliary slots are flexibly selected according to the motor stator parameters to improve the waveform of the electromagnetic wave to the greatest extent.
[0021] Preferably, a plurality of stator teeth are symmetrically arranged on the radial inner side of the motor stator, and the first auxiliary slot and the second auxiliary slot are formed on each of the stator teeth.
[0022] In the technical solution, the stator teeth and the auxiliary slots are symmetrically arranged on the radial inner side of the motor stator, which is convenient for processing and makes the state of each part of the motor stator more consistent.
[0023] The utility model also provides a permanent magnet motor, comprising the motor stator as described in any one of the above items.
[0024] In the technical solution, the permanent magnet motor uses the above-mentioned motor stator, which reduces the operating noise.
[0025] The utility model also provides a compressor, comprising the permanent magnet motor as described above.
[0026] In the technical solution, the compressor uses the above-mentioned permanent magnet motor, which reduces the operating noise and meets the user's quietness requirements.
[0027] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.
[0028] The positive and progressive effects of the utility model are:
[0029] The motor stator and the permanent magnet motor and compressor comprising the same of the utility model have auxiliary slots on the motor stator to weaken the tooth slot torque, improve the order of the radial electromagnetic force wave, reduce the deformation of the motor stator, and further reduce the spatial low-order components of the radial electromagnetic force wave, thereby reducing the vibration noise of the motor. At the same time, in order to avoid the actual size of the air gap spacing becoming larger, thereby reducing the back electromotive force of the motor, only two auxiliary slots are designed.
[0030] To further understand the features and technical contents of the present application, please refer to the following detailed description and drawings of the present application. However, the detailed description and drawings here are only used to illustrate the present application and do not impose any limitations on the scope of the claims of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.
[0032] Figure 1 It is a partial schematic diagram of the motor stator of Example 1 of the utility model.
[0033] Figure 2 It is a partial top view schematic diagram of the motor stator of Example 1 of the utility model.
[0034] Figure 3It is a partial top view schematic diagram of the motor stator of Example 2 of the utility model.
[0035] Figure 4 It is a partial top view schematic diagram of the motor stator of Example 3 of the utility model.
[0036] Figure 5 It is a partial schematic diagram of the motor stator of Example 4 of the utility model.
[0037] Figure 6 This is a partial schematic diagram of the motor stator of Example 5 of the utility model.
[0038] Reference numerals
[0039] 1 Stator lamination
[0040] 11 First stator punching
[0041] 12 Second stator punching
[0042] 13 Third stator punching
[0043] 2 stator teeth
[0044] 3-tooth boot
[0045] 4 First auxiliary slot
[0046] 5 Second auxiliary slot DETAILED DESCRIPTION
[0047] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through other different specific implementation methods, and the details in the present application can also be modified or changed in various ways according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0048] The following is a detailed description of the embodiments of the present application with reference to the accompanying drawings so that those skilled in the art can easily implement the present application. The present application can be embodied in a variety of different forms and is not limited to the embodiments described herein.
[0049] In the representations of the present application, the representations with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the represented specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples represented in the present application and the features of the different embodiments or examples, unless they contradict each other.
[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0051] In order to clearly describe the present application, components irrelevant to the description are omitted, and the same reference symbols are given to the same or similar components throughout the specification.
[0052] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.
[0053] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.
[0054] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.
[0055] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present application. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.
[0056] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which this application belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the relevant technical literature and the contents of the current disclosure, and unless defined, shall not be overly interpreted as ideal or very formal meanings.
[0057] Example 1
[0058] like Figure 1 and Figure 2 As shown, the motor stator in this embodiment includes a plurality of stacked stator punching sheets 1; a stator tooth 2 is provided on the radial inner side of the motor stator, and a symmetrical tooth shoe portion 3 is formed on the radial inner side of the stator tooth 2;
[0059] The stator sheet 1 includes a plurality of first stator sheets 11 and a plurality of second stator sheets 12. The first stator sheet 11 is arranged at the upper part of the motor stator and has a first auxiliary opening. The plurality of first auxiliary openings are stacked to form a first auxiliary slot 4 from top to bottom. The second stator sheet 12 is arranged at the lower part of the motor stator and has a second auxiliary opening. The plurality of second auxiliary openings are stacked to form a second auxiliary slot 5 from bottom to top. The first auxiliary slot 4 and the second auxiliary slot 5 are staggered and both are formed on the radial inner surface of the tooth shoe 3. The center line of the first auxiliary slot 4 and the center line of the second auxiliary slot 5 are symmetrically distributed about the symmetry axis of the tooth shoe 3. The motor stator generally has a slot for winding on the inside to generate a cogging torque, which deteriorates the order of the electromagnetic force wave. At the same time, the vibration deformation generated by the motor stator in the radial direction is the main source of electromagnetic noise. The auxiliary slots on the motor stator weaken the cogging torque, thereby reducing the spatial low-order components of the radial electromagnetic force wave, thereby reducing the vibration noise of the motor. Too many auxiliary slots will increase the actual size of the air gap, thereby reducing the motor back electromotive force, so only two auxiliary slots are designed.
[0060] The length of the first auxiliary groove 4 is L1, the length of the second auxiliary groove 5 is L2, and L1 / L2 = 1. The lengths of the two auxiliary grooves are kept in an appropriate ratio to improve the waveform of the electromagnetic force wave.
[0061] In other embodiments, L1 / L2 may also be other values satisfying the range of 0.85≤L1 / L2≤1.15.
[0062] In this embodiment, the width of the first auxiliary groove 4 is W1, the width of the second auxiliary groove 5 is W2, and W1 / W2 = 1. The widths of the two auxiliary grooves are kept in an appropriate ratio to improve the waveform of the electromagnetic force wave.
[0063] In other embodiments, W1 / W2 may also be other values satisfying the range of 0.9≤W1 / W2≤1.1.
[0064] In this embodiment, the radial depth of the first auxiliary slot 4 in the motor stator is H1, the radial depth of the second auxiliary slot 5 in the motor stator is H2, and H1 / H2 = 1. The depths of the two auxiliary slots in the motor stator in the radial direction maintain an appropriate ratio to improve the waveform of the electromagnetic force wave.
[0065] In other embodiments, H1 / H2 may also be other values satisfying the range of 0.8≤H1 / H2≤1.2.
[0066] In this embodiment, the first auxiliary slot 4 and the second auxiliary slot 5 are rectangular slots. The auxiliary slots are flexibly selected according to the motor stator parameters to improve the waveform of the electromagnetic wave to the greatest extent.
[0067] A plurality of stator teeth 2 are symmetrically arranged on the radial inner side of the motor stator, and each stator tooth 2 is formed with a first auxiliary slot 4 and a second auxiliary slot 5. The stator teeth 2 and the auxiliary slots are symmetrically arranged on the radial inner side of the motor stator, which is convenient for processing and makes the state of each part of the motor stator more consistent.
[0068] This embodiment also provides a permanent magnet motor, comprising the motor stator as described in any one of the above items. The permanent magnet motor uses the motor stator to reduce the noise during use.
[0069] This embodiment also provides a compressor, comprising the permanent magnet motor as described above. The compressor uses the permanent magnet motor, which reduces the noise during use and meets the user's quietness requirements.
[0070] As shown in Table 1, there is a comparison of the electromagnetic exciting force between the motor stator in this embodiment and the motor stator in the prior art.
[0071] Table 1
[0072]
[0073] Example 2
[0074] like Figure 3 As shown, the difference between this embodiment and embodiment 1 is that:
[0075] The first auxiliary groove 4 and the second auxiliary groove 5 are semicircular grooves.
[0076] Example 3
[0077] like Figure 4 As shown, the difference between this embodiment and embodiment 1 is that:
[0078] The first auxiliary groove 4 and the second auxiliary groove 5 are triangular grooves.
[0079] In other embodiments, the first auxiliary groove 4 and the second auxiliary groove 5 may also be trapezoidal grooves.
[0080] Example 4
[0081] like Figure 5 As shown, the difference between this embodiment and embodiment 1 is that:
[0082] The stator sheet 1 further includes a third stator sheet 13, which is located between the first stator sheet 11 and the second stator sheet 12. The third stator sheet 13 is provided with a first auxiliary opening and a second auxiliary opening, and the bottom of the first auxiliary slot 4 is lower than the top of the second auxiliary slot 5 in the axial direction of the motor stator. The bottom of the first auxiliary slot 4 passes over the top of the second auxiliary slot 5 in the axial direction of the motor stator, so that the distortion of the electromagnetic force wave of a specific order is reduced.
[0083] Example 5
[0084] like Figure 6 As shown, the difference between this embodiment and embodiment 1 is that:
[0085] The stator sheet 1 further includes a third stator sheet 13, which is located between the first stator sheet 11 and the second stator sheet 12. The third stator sheet 13 does not have a first auxiliary opening and a second auxiliary opening, and the bottom of the first auxiliary slot 4 is higher than the top of the second auxiliary slot 5 in the axial direction of the motor stator. The bottom of the first auxiliary slot 4 is at a distance from the top of the second auxiliary slot 5 in the axial direction of the motor stator, so that the distortion of the electromagnetic force wave of a specific order is reduced.
[0086] In summary, the purpose of the present invention is to provide a motor stator and a permanent magnet motor and a compressor containing the same, to improve the structure of the motor stator and reduce the running noise of the motor.
[0087] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A motor stator, characterized in that: It comprises a plurality of stacked stator punching sheets (1); a stator tooth (2) is arranged on the radial inner side of the motor stator, and a symmetrical tooth shoe portion (3) is formed on the radial inner side of the stator tooth (2); The stator punching sheet (1) comprises a plurality of first stator punching sheets (11) and a plurality of second stator punching sheets (12), wherein the first stator punching sheet (11) is arranged at the upper part of the motor stator and has a first auxiliary opening, and the plurality of the first auxiliary openings are stacked to form a first auxiliary slot (4) from top to bottom; the second stator punching sheet (12) is arranged at the lower part of the motor stator and has a second auxiliary opening, and the plurality of the second auxiliary openings are stacked to form a second auxiliary slot (5) from bottom to top; the first auxiliary slot (4) and the second auxiliary slot (5) are staggeredly distributed and are both formed on the radial inner surface of the tooth shoe portion (3), and the center line of the first auxiliary slot (4) and the center line of the second auxiliary slot (5) are symmetrically distributed about the symmetry axis of the tooth shoe portion (3).
2. The motor stator according to claim 1, characterized in that: The stator punching sheet (1) further comprises a third stator punching sheet (13), wherein the third stator punching sheet (13) is located between the first stator punching sheet (11) and the second stator punching sheet (12), the first auxiliary opening and the second auxiliary opening are formed on the third stator punching sheet (13), and the bottom of the first auxiliary slot (4) is lower than the top of the second auxiliary slot (5) in the axial direction of the motor stator.
3. The motor stator according to claim 1, characterized in that: The stator punching sheet (1) further comprises a third stator punching sheet (13), wherein the third stator punching sheet (13) is located between the first stator punching sheet (11) and the second stator punching sheet (12), the first auxiliary opening and the second auxiliary opening are not provided on the third stator punching sheet (13), and the bottom of the first auxiliary slot (4) is higher than the top of the second auxiliary slot (5) in the axial direction of the motor stator.
4. The motor stator according to claim 1, characterized in that: The length of the first auxiliary groove (4) is L1, the length of the second auxiliary groove (5) is L2, and 0.85≤L1 / L2≤1.
15.
5. The motor stator according to claim 1, characterized in that: The width of the first auxiliary groove (4) is W1, the width of the second auxiliary groove (5) is W2, and 0.9≤W1 / W2≤1.
1.
6. The motor stator according to claim 1, characterized in that: The depth of the first auxiliary slot (4) in the radial direction of the motor stator is H1, the depth of the second auxiliary slot (5) in the radial direction of the motor stator is H2, and 0.8≤H1 / H2≤1.
2.
7. The motor stator according to claim 1, characterized in that: The first auxiliary groove (4) and the second auxiliary groove (5) are any one of a semicircular groove, a rectangular groove, a trapezoidal groove or a triangular groove.
8. The motor stator according to claim 1, characterized in that: A plurality of stator teeth (2) are symmetrically arranged on the radial inner side of the motor stator, and each of the stator teeth (2) is formed with the first auxiliary slot (4) and the second auxiliary slot (5).
9. A permanent magnet motor, characterized in that: The invention comprises a motor stator as claimed in any one of claims 1 to 8.
10. A compressor, characterized in that: Comprising the permanent magnet motor as claimed in claim 9.