Motor for electric compressor of new energy automobile

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a motor for a new energy automobile electric compressor. The utility model provides a motor for an electric compressor of a new energy automobile, which comprises a stator core, a plurality of magnetic poles arranged on the inner wall of the stator core at equal intervals; the rotor iron core is rotationally arranged in the stator iron core; the outer wall of the rotor iron core is formed by splicing a plurality of arc surfaces, and the breakpoints of the circular corners corresponding to the arc surfaces are not concentric with the axis of the rotor iron core. The outer walls of the arc surfaces and the inner walls of the magnetic poles are of an unequal-distance air gap structure. Through the arrangement of the arc surfaces, the outer wall of the rotor core and the inner wall of the stator core form a non-equidistant air gap structure, which not only helps to improve the positive rotation of the back electromotive force waveform so as to reduce the torque ripple, but also achieves the effect of reducing electromagnetic noise.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and in particular relates to a motor for electric compressors in new energy vehicles. Background Technology

[0002] In electric motors, the air gap between the rotor and stator is crucial. In traditional motor designs, the air gap is typically uniformly distributed. However, the length of the air gap affects the strength of the air gap magnetic flux density, and variations in the air gap length also influence the motor's vibration and noise.

[0003] The longer the air gap length of a motor, the lower its output torque. This is because reducing the air gap length increases the air gap magnetic flux density, thereby strengthening the motor's magnetic field. Conversely, the shorter the air gap length, the greater the average output torque. However, due to manufacturing and assembly constraints, the air gap length cannot be too small. An excessively small air gap can easily cause mechanical friction, increasing motor vibration and noise, and reducing the motor's lifespan.

[0004] The range of motor noise variation is large for different air gap lengths, indicating that the air gap length has a significant impact on the motor's vibration and noise.

[0005] Therefore, it is essential to develop a motor for electric compressors in new energy vehicles.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0007] This disclosure provides at least one embodiment of a motor for an electric compressor in a new energy vehicle.

[0008] In a first aspect, embodiments of this disclosure provide a motor for an electric compressor in a new energy vehicle, comprising:

[0009] The stator core has several magnetic poles evenly spaced on its inner wall;

[0010] The rotor core rotates within the stator core.

[0011] The outer wall of the rotor core is made up of several arc surfaces spliced ​​together, and the break points of the circular corners corresponding to the arc surfaces are not concentric with the axis of the rotor core.

[0012] Among them, the outer wall of several of the arc surfaces and the inner wall of the magnetic poles form an unequal air gap structure.

[0013] In one alternative implementation, the number of arc surfaces is even, and the sidewalls of two adjacent arc surfaces abut against each other.

[0014] In one optional implementation, the radius of the arc surface is r1;

[0015] The distance between the end of the arc surface and the center of the rotor core is r2;

[0016] The distance between the center point of symmetry of the arc surface and the center of the rotor core is r3.

[0017] Among them, r3>r2>r1, and r3:r2:r1=1.12:1.11:1.

[0018] In one optional embodiment, the distance between the center point of symmetry of the arc surface and the inner wall of the magnetic pole is d1.

[0019] The distance between the two ends of the arc surface and the inner wall of the magnetic pole is d2;

[0020] Wherein, d2:d1 = 2.18:1.

[0021] In one alternative embodiment, the cross-section of the arc surface is fan-shaped, and the two ends of the arc surface extend to the center of the rotor core to form an acute angle α.

[0022] In one alternative embodiment, the inner wall of the magnetic pole includes two arc surfaces, which are symmetrically arranged.

[0023] Secondly, embodiments of this disclosure provide a rotor, comprising:

[0024] The rotor core rotates inside the motor.

[0025] A plurality of arc surfaces are arranged at equal intervals along the circumference of the outer wall of the rotor core, and the arc surfaces are not concentric with the rotor core.

[0026] The radius of the arc surface is r1;

[0027] The distance between the two ends of the arc surface and the center of the rotor core is r2;

[0028] The distance between the center point of symmetry of the arc surface and the center of the rotor core is r3.

[0029] Among them, r3>r2>r1, and r3:r2:r1=1.12:1.11:1.

[0030] In one optional embodiment, the maximum distance between the outer wall of the arc surface and the center of the rotor core is 31.95 mm.

[0031] The minimum distance between the outer wall of the arc surface and the center of the rotor core is 31.65 mm.

[0032] Thirdly, embodiments of this disclosure provide a stator, including:

[0033] The stator core is located inside the motor, and its inner wall is provided with several magnetic poles at equal intervals.

[0034] Each of the magnetic poles has two arc surfaces on its inner wall, and the two arc surfaces are symmetrically arranged.

[0035] In one alternative embodiment, the radius of the arc surface is 22.51 mm.

[0036] The beneficial effects of this utility model are that the electric compressor motor for new energy vehicles of this utility model, through the cooperation of the rotor core and the arc surface, the outer wall of the arc surface and the inner wall of the magnetic pole form an unequal air gap structure. By changing the size and distribution of the air gap, more flexible magnetic field control is achieved. The unequal air gap structure can not only improve the operating efficiency of the motor, reduce energy loss, and improve the dynamic response performance of the motor, but also help to reduce vibration and noise during operation and improve the operating stability of the motor.

[0037] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0038] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is a front view of a motor for an electric compressor used in a new energy vehicle, provided in an embodiment of this disclosure.

[0041] Figure 2 A perspective view of the rotor core provided in an embodiment of this disclosure;

[0042] Figure 3 A front view of the rotor core provided in an embodiment of this disclosure;

[0043] Figure 4 A perspective view of the stator core provided in an embodiment of this disclosure;

[0044] Figure 5 A front view of the stator core provided in an embodiment of this disclosure;

[0045] Figure 6 A partial front view of the arc surface and magnetic poles provided in an embodiment of this disclosure.

[0046] In the picture:

[0047] 1. Stator core; 10. Magnetic pole; 11. Arc surface; 2. Rotor core; 3. Arc surface. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0049] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0050] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0051] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0052] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0053] Research has revealed a drawback of existing technology: the larger the air gap length of the motor, the smaller the output torque. This is because reducing the air gap length increases the air gap magnetic flux density, thereby strengthening the motor's magnetic field. Conversely, the smaller the air gap length, the greater the average output torque. However, due to manufacturing and assembly constraints, the air gap length cannot be too small. An excessively small air gap can easily cause mechanical friction, increasing motor vibration and noise, and reducing the motor's lifespan.

[0054] The range of motor noise variation is large for different air gap lengths, indicating that the air gap length has a significant impact on the motor's vibration and noise.

[0055] Therefore, it is essential to develop motors for electric compressors in new energy vehicles.

[0056] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0057] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0058] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0059] like Figures 1 to 6As shown, some embodiments provide a motor for an electric compressor in a new energy vehicle, including: a stator core 1, with a plurality of magnetic poles 10 evenly spaced on its inner wall; a groove is provided between two adjacent magnetic poles 10, and the stator core 1 is disposed on the inner wall of the motor housing; a rotor core 2, which is rotatably disposed inside the stator core 1; a fixing hole is opened at the center of the rotor core 2, and the rotating shaft is fixed in the fixing hole. The outer wall of the rotor core 2 is formed by splicing a plurality of arc surfaces 3, and the breakpoint of the circular corner corresponding to the arc surface 3 is not concentric with the axis of the rotor core 2; wherein, the outer wall of the plurality of arc surfaces 3 and the inner wall of the magnetic poles 10 form an unequal-distance air gap structure. Through the cooperation of rotor core 2 and arc surface 3, the outer wall of arc surface 3 and the inner wall of magnetic pole 10 form an unequal air gap structure. By changing the size and distribution of the air gap, more flexible magnetic field control is achieved. The unequal air gap structure can not only improve the operating efficiency of the motor, reduce energy loss, and improve the dynamic response performance of the motor, but also help reduce vibration and noise during operation and improve the operating stability of the motor.

[0060] Reference Appendix Figure 3 The number of arc surfaces 3 is even, and the sidewalls of adjacent arc surfaces 3 abut against each other. The cross-section of each arc surface 3 is fan-shaped, and the two ends of each arc surface 3 extend towards the center of the rotor core 2 to form an acute angle α, preferably, the acute angle α = 45°. Preferably, there are 8 arc surfaces 3. The distance between the center of each arc surface 3 and the center of the rotor core 2 is 3.5 mm.

[0061] Reference Appendix Figure 3 The radius of the arc surface 3 is r1; the distance between the end of the arc surface 3 and the center of the rotor core 2 is r2; the distance between the center of symmetry of the arc surface 3 and the center of the rotor core 2 is r3; wherein, r3>r2>r1, and r3:r2:r1=1.12:1.11:1, the above ratio is rounded to two decimal places. Further, r3=31.95; r2=31.65; r1=28.45.

[0062] Reference Appendix Figure 6 The distance from the center point of symmetry of the arc surface 3 to the inner wall of the magnetic pole 10 is d1; at this time, the distance between the arc surface 3 and the magnetic pole 10 is the smallest. The distance from both ends of the arc surface 3 to the inner wall of the magnetic pole 10 is d2; at this time, the distance from the outer walls of both ends of the arc surface 3 to the magnetic pole 10 is the largest. Wherein, d2:d1 = 2.18:1. Further, d2 = 1.2mm; d1 = 0.55mm. That is, the maximum air gap between the outer wall of the rotor core 2 and the inner wall of the magnetic pole 10 of the stator core 1 is 1.2mm, and the minimum air gap is 0.55mm.

[0063] To accommodate the rotor core 2, the inner wall of the magnetic pole 10 includes two circular arc surfaces 11, which are symmetrically arranged. The conventional circular inner wall of the magnetic pole 10, instead of being round, is configured with two symmetrical circular arc surfaces 11, which helps reduce noise during rotor core 2 rotation.

[0064] Some embodiments provide a rotor comprising:

[0065] Rotor core 2, its rotation is set inside the motor;

[0066] A plurality of arc surfaces 3 are arranged at equal intervals along the circumference of the outer wall of the rotor core 2, and the arc surfaces 3 are not concentric with the rotor core 2.

[0067] The radius of the arc surface 3 is r1;

[0068] The distance between the two ends of the arc surface 3 and the center of the rotor core 2 is r2;

[0069] The distance between the center point of symmetry of the arc surface 3 and the center of the rotor core 2 is r3.

[0070] Where r3 > r2 > r1, and r3:r2:r1 = 1.12:1.11:1; the above ratio is rounded to two decimal places. Further, r3 = 31.95; r2 = 31.65; r1 = 28.45.

[0071] Furthermore, the maximum distance between the outer wall of the arc surface 3 and the center of the rotor core 2 is 31.95 mm;

[0072] The minimum distance between the outer wall of the arc surface 3 and the center of the rotor core 2 is 31.65 mm.

[0073] Some embodiments provide a stator comprising:

[0074] The stator core 1 is installed inside the motor, and its inner wall is provided with several magnetic poles 10 at equal intervals.

[0075] Each of the magnetic poles 10 has two arc surfaces 11 on its inner wall, and the two arc surfaces 11 are arranged symmetrically.

[0076] Furthermore, the radius of the arc surface 11 is 22.51 mm.

[0077] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0078] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0079] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A motor for an electric compressor in a new energy vehicle, characterized in that, include: The stator core (1) has several magnetic poles (10) arranged at equal intervals on its inner wall. The rotor core (2) is rotatably disposed inside the stator core (1); The outer wall of the rotor core (2) is made up of several first arc surfaces (3) spliced ​​together, and the break point of the circular corner corresponding to the first arc surface (3) is not concentric with the axis of the rotor core (2); Among them, the outer wall of several of the first arc surfaces (3) and the inner wall of the magnetic pole (10) form an unequal-distance air gap structure; The number of the first arc surfaces (3) is even, and the sidewalls of two adjacent first arc surfaces (3) abut against each other; The radius of the first arc surface (3) is r1; The distance between the end of the first arc surface (3) and the center of the rotor core (2) is r2; The distance between the center point of the first arc surface (3) and the center of the rotor core (2) is r3; Among them, r3>r2>r1, and r3:r2:r1=1.12:1.11:

1.

2. The motor for an electric compressor in a new energy vehicle as described in claim 1, characterized in that, The distance between the center point of symmetry of the first arc surface (3) and the inner wall of the magnetic pole (10) is d1; The distance between the two ends of the first arc surface (3) and the inner wall of the magnetic pole (10) is d2; Wherein, d2:d1 = 2.18:

1.

3. The motor for an electric compressor in a new energy vehicle as described in claim 1, characterized in that, The cross section of the first arc surface (3) is fan-shaped, and the two ends of the first arc surface (3) extend to the center of the rotor core to form an acute angle α.

4. The motor for an electric compressor in a new energy vehicle as described in claim 1, characterized in that, The inner wall of the magnetic pole (10) includes two second arc surfaces (11), and the two second arc surfaces (11) are symmetrically arranged.

5. A motor for an electric compressor in a new energy vehicle, characterized in that, include: The rotor core (2) is rotated inside the motor. A plurality of first arc surfaces (3) are arranged at equal intervals along the circumferential direction of the outer wall of the rotor core (2), and the first arc surfaces (3) are not concentric with the rotor core (2); The radius of the first arc surface (3) is r1; The distance between the two ends of the first arc surface (3) and the center of the rotor core (2) is r2; The distance between the center point of the first arc surface (3) and the center of the rotor core (2) is r3; Among them, r3>r2>r1, and r3:r2:r1=1.12:1.11:

1.

6. The motor for an electric compressor in a new energy vehicle as described in claim 5, characterized in that, The maximum distance between the outer wall of the first arc surface (3) and the center of the rotor core (2) is 31.95 mm; The minimum distance between the outer wall of the first arc surface (3) and the center of the rotor core (2) is 31.65 mm.

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