Rotor punching sheet structure and permanent magnet synchronous motor

Abstract

The utility model belongs to the technical field of permanent magnet synchronous motors, and discloses a rotor punching sheet structure and a permanent magnet synchronous motor. The rotor punching sheet structure comprises a punching sheet body, the punching sheet body is provided with a plurality of magnetic poles which are uniformly arranged along the circumferential direction, and each magnetic pole is provided with a first magnetic steel groove and a second magnetic steel groove; a plurality of harmonic groove groups are uniformly formed in the outer peripheral surface of the punching sheet body in the circumferential direction, the harmonic groove groups are symmetrically arranged relative to the first symmetric surface, and the first symmetric surface penetrates through the circle center of the punching sheet body in the radial direction. According to the rotor punching sheet structure, the harmonic groove group is arranged on the peripheral surface of the punching sheet body, and the harmonic groove group is symmetrically arranged relative to the first symmetric surface, so that the harmonic groove group can reduce harmonic electromagnetic force and suppress torque fluctuation in the rotation process of the rotor punching sheet structure, noise and vibration caused by operation of the permanent magnet synchronous motor are effectively weakened, and the service life of the rotor punching sheet structure is prolonged. And therefore, the comfort of the vehicle during driving is improved.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet synchronous motor technology, and in particular to a rotor lamination structure and a permanent magnet synchronous motor. Background Technology

[0002] With the increasing popularity and promotion of new energy vehicles, drive motors have become a focus of attention for automakers, and improving motor power density and output efficiency has become a key research direction. Permanent magnet synchronous motors, as one of the most important types of drive motors for new energy vehicles, are widely used in these vehicles due to their small size and high efficiency.

[0003] A permanent magnet synchronous motor (PMSM) consists of a stator, rotor, and end covers. The stator of a PMSM is essentially the same as that of a conventional induction motor, employing a laminated structure to reduce losses during operation. The rotor can be made as a solid structure or a laminated structure. During operation, existing PMSMs experience significant torque fluctuations as the rotor rotates circumferentially due to the non-sinusoidal nature of their internal magnetic field and the stator cogging effect. These torque fluctuations and radial forces affect the motor's torque control, leading to vibration and noise, which in turn impacts vehicle comfort during driving. Utility Model Content

[0004] The purpose of this invention is to provide a rotor lamination structure and a permanent magnet synchronous motor that can reduce harmonic electromagnetic forces and suppress torque fluctuations, thereby improving the comfort of the vehicle during driving.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The rotor lamination structure includes a lamination body, the lamination body having a plurality of magnetic poles uniformly arranged circumferentially, and each magnetic pole having a first magnetic slot and a second magnetic slot.

[0007] Multiple harmonic groove groups are uniformly formed on the outer circumferential surface of the lamination body. The harmonic groove groups are symmetrically arranged with respect to a first symmetrical surface, which passes radially through the center of the lamination body.

[0008] Preferably, the number of harmonic slots is the same as the number of magnetic poles and they are arranged in a one-to-one correspondence.

[0009] Preferably, the harmonic slot group includes a first harmonic slot and a second harmonic slot, wherein the first harmonic slot and the second harmonic slot are respectively symmetrically arranged with respect to the first symmetrical surface.

[0010] Preferably, the first harmonic groove includes an arc-shaped first groove bottom section, the cross-sectional arc of the first groove bottom section is part of a first harmonic circle, and the radius of the first harmonic circle is 1.4mm-1.6mm.

[0011] Preferably, the first harmonic groove further includes a straight connecting section connecting both sides of the bottom section of the first groove, and the included angle between the two connecting sections is 120°-135°.

[0012] Preferably, the second harmonic groove includes an arc-shaped second groove bottom section, the cross-sectional arc of the second groove bottom section being a part of a second harmonic circle, the radius of the second harmonic circle being 28mm-29mm.

[0013] Preferably, the harmonic slot group includes two first harmonic slots and two second harmonic slots, with the two second harmonic slots of the harmonic slot group located between the two first harmonic slots.

[0014] Preferably, each of the magnetic poles is symmetrically arranged with respect to a second symmetry plane, which passes radially through the center of the lamination body.

[0015] Preferably, each magnetic pole has two first magnetic slots, which are symmetrically arranged on both sides of the second plane of symmetry, and the included angle between the sidewalls of the two first magnetic slots near the outer peripheral surface is 100°-110°; and / or, each magnetic pole has two second magnetic slots, which are symmetrically arranged on both sides of the second plane of symmetry, and the included angle between the sidewalls of the two second magnetic slots near the outer peripheral surface is 160°-170°.

[0016] A permanent magnet synchronous motor includes a stator lamination structure and the aforementioned rotor lamination structure. The stator lamination structure and the lamination body are coaxially arranged around the outer periphery of the rotor lamination structure. A winding groove is formed on the inner wall of the stator lamination structure. A flange is provided at the opening of the winding groove. The flange surrounds the opening of the winding groove to form a narrow opening. The width of the narrow opening is 1.5mm-1.7mm, and the width of the winding groove is 4mm-5mm.

[0017] The beneficial effects of this utility model are as follows:

[0018] The rotor lamination structure provided by this utility model includes a lamination body with multiple magnetic poles. The multiple magnetic poles are evenly spaced along the circumference of the lamination body, and each magnetic pole is provided with a first steel groove and a second magnetic steel groove. The harmonic groove group on the outer circumferential surface of the lamination body is also evenly opened along the circumference. Therefore, the rotor lamination structure can rotate more smoothly. Since the harmonic groove group is opened on the outer circumferential surface of the lamination body and is symmetrically arranged about the first symmetrical surface, the harmonic groove group can reduce harmonic electromagnetic force and suppress torque fluctuation during the rotation of the rotor lamination structure, thereby effectively reducing the noise and vibration caused by the operation of the permanent magnet synchronous motor, and thus improving the comfort of the vehicle during driving.

[0019] The permanent magnet synchronous motor provided by this utility model includes a stator lamination structure and the aforementioned rotor lamination structure. The stator lamination structure surrounds the outer periphery of the rotor lamination structure, and the two can rotate relative to each other. Since the inner wall of the stator lamination structure has a narrow opening and a winding slot, when the stator lamination structure and the rotor lamination structure rotate relative to each other, the narrow opening and the winding slot can cooperate with the harmonic slot group, reducing the harmonic electromagnetic force of the motor, thereby effectively suppressing the noise and vibration generated during operation. Attached Figure Description

[0020] Figure 1 This is an assembly structure diagram of the rotor lamination structure and the stator lamination structure provided in a specific embodiment of this utility model;

[0021] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0022] Figure 3 This is a schematic diagram of the structure of the first harmonic groove provided in a specific embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the second harmonic groove provided in a specific embodiment of this utility model.

[0024] In the picture:

[0025] 100 - Stator lamination structure; 110 - Narrow opening; 120 - Winding slot;

[0026] 1-Punching body; 11-First magnet groove; 12-Second magnet groove; 13-Harmonic groove group; 131-First harmonic groove; 1311-Bottom section of the first groove; 1312-Connecting section; 132-Second harmonic groove; 1321-Bottom section of the second groove; 14-Weight reduction hole. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] like Figure 1 and Figure 2As shown, this utility model provides a rotor lamination structure, which includes a lamination body 1. The lamination body 1 has multiple magnetic poles evenly arranged circumferentially, and each magnetic pole has a first magnetic slot 11 and a second magnetic slot 12. Multiple harmonic slot groups 13 are evenly arranged circumferentially on the outer circumferential surface of the lamination body 1. The harmonic slot groups 13 are symmetrically arranged with respect to a first symmetry plane, and each harmonic slot group 13 corresponds to a first symmetry plane. The first symmetry plane passes radially through the axis of the lamination body 1 and is perpendicular to the lamination body 1. In this embodiment, the harmonic slot groups 13 on the outer circumferential surface of the lamination body 1 are also evenly arranged circumferentially, so the lamination body 1 can rotate more smoothly. Since the harmonic slot groups 13 are arranged on the outer circumferential surface of the lamination body 1 and are symmetrically arranged with respect to the first symmetry plane, the harmonic slot groups 13 can reduce harmonic electromagnetic force and suppress torque fluctuations during the rotation of the rotor lamination structure, thereby effectively reducing the noise and vibration caused by the operation of the permanent magnet synchronous motor, and thus improving the comfort of the vehicle during driving.

[0032] Furthermore, the number of harmonic slot groups 13 is the same as that of the magnetic poles and they are arranged in a one-to-one correspondence. The lamination body 1 has a circular structure, and each harmonic slot group 13 corresponds to the position of the magnetic pole and is arranged on the outer peripheral surface of the lamination body 1; specifically, as shown in... Figure 2 As shown, the harmonic groove group 13 includes a first harmonic groove 131 and a second harmonic groove 132. The first harmonic groove 131 and the second harmonic groove 132 are respectively symmetrically arranged with respect to the first symmetrical surface, thereby improving the stability of the lamination body 1 during rotation and better suppressing torque fluctuations.

[0033] like Figure 3 As shown, the first harmonic groove 131 includes an arc-shaped first groove bottom section 1311. The arc of the cross-section of the first groove bottom section 1311 is a part of the first harmonic circle, and the radius of the first harmonic circle is 1.4mm-1.6mm. Specifically, the arc of the cross-section of the first groove bottom section 1311 is a part of the first harmonic circle with a radius of 1.4mm-1.6mm. Preferably, the radius of the first harmonic circle is 1.5mm.

[0034] Furthermore, such as Figure 3 As shown, the first harmonic groove 131 also includes a straight connecting section 1312 connecting both sides of the first groove bottom section 1311, and the included angle between the two connecting sections 1312 is 120°-135°. Specifically, the first harmonic groove 131 is composed of the first groove bottom section 1311 at the bottom of the groove and the connecting sections 1312 on both sides. The first groove bottom section 1311 is arc-shaped, and the cross section of the connecting section 1312 is a flat straight line. The first groove bottom section 1311 is connected to the outer peripheral surface of the lamination body 1 through the connecting sections 1312 on both sides. The extension lines of the two connecting sections 1312 intersect at an angle, and the included angle range is 120°-135°, preferably 132°.

[0035] Furthermore, such as Figure 4 As shown, the second harmonic groove 132 includes an arc-shaped second groove bottom section 1321. The arc of the cross-section of the second groove bottom section 1321 is a part of a second harmonic circle with a radius of 28mm-29mm. Specifically, the cross-section of the second harmonic groove 132 is arc-shaped, and both sides of the second groove bottom section 1321 are connected to the outer peripheral surface of the lamination body 1. The arc of the cross-section of the second groove bottom section 1321 is a part of a second harmonic circle with a radius of 28mm-29mm, preferably a second harmonic circle with a radius of 28.5mm.

[0036] like Figure 2 As shown, the harmonic channel group 13 includes two first harmonic channels 131 and two second harmonic channels 132, with the two second harmonic channels 132 located between the two first harmonic channels 131. In this embodiment, the harmonic channel group 13 includes two first harmonic channels 131 and two second harmonic channels 132, with the two second harmonic channels 132 disposed between the two first harmonic channels 131, and the two second harmonic channels 132 and the two first harmonic channels 131 being symmetrical about a first symmetry plane.

[0037] To further improve the stability of the rotor lamination structure during operation, such as Figure 2 As shown, each magnetic pole corresponds to a second symmetry plane, and each magnetic pole is symmetrically arranged with respect to the second symmetry plane. The second symmetry plane passes radially through the axis of the lamination body 1 and is perpendicular to the lamination body 1. Specifically, the corresponding harmonic groove group 13 coincides with the first and second symmetry planes of the magnetic poles, and each magnetic pole is symmetrically arranged with respect to the second symmetry plane.

[0038] Specifically, such as Figure 1 and Figure 2 As shown, each magnetic pole has two first magnetic slots 11, which are symmetrically arranged on both sides of the second plane of symmetry. The included angle between the sidewalls of the two first magnetic slots 11 near the outer peripheral surface is 100°-110°; and / or, each magnetic pole has two second magnetic slots 12, which are symmetrically arranged on both sides of the second plane of symmetry. The included angle between the sidewalls of the two second magnetic slots 12 near the outer peripheral surface is 160°-170°.

[0039] In this embodiment, the lamination body 1 is provided with eight magnetic poles, each magnetic pole having two first magnetic steel grooves 11 and two second magnetic steel grooves 12. The first and second symmetry planes coincide, that is, the magnetic poles and harmonic groove groups 13 are symmetrical about the same plane. The two first magnetic steel grooves 11 form a V-shaped structure symmetrical about the first symmetry plane, and the two second magnetic steel grooves 12 also form a V-shaped structure symmetrical about the first symmetry plane. The included angle between the sidewalls of the two first magnetic steel grooves 11 near the outer peripheral surface of the lamination body 1 is 100°-110°, and the included angle between the sidewalls of the two second magnetic steel grooves 12 near the outer peripheral surface of the lamination body 1 is 160°-170°. Preferably, the included angle between the sidewalls of the two first magnetic steel grooves 11 near the outer peripheral surface of the lamination body 1 is 102°, and the included angle between the sidewalls of the two second magnetic steel grooves 12 near the outer peripheral surface of the lamination body 1 is 168°.

[0040] In order to reduce the energy consumption when the rotor lamination structure rotates, a number of weight reduction holes 14 are provided on the lamination body 1. The weight reduction holes 14 are arranged circumferentially on the lamination body 1, and the shape and number of weight reduction holes 14 can be set according to actual needs.

[0041] In this embodiment, as Figure 1 As shown, eight weight-reducing holes 14 are provided, and the eight weight-reducing holes 14 are arranged circumferentially around the center of the lamination body 1. The cross-section of the weight-reducing hole 14 is elliptical, and the minor axis of the cross-section of the weight-reducing hole 14 passes through the axis of the lamination body 1. One weight-reducing hole 14 is provided between two adjacent harmonic groove groups 13. The included angles between the minor axes of the eight weight-reducing holes 14 are 42.5°, 42.5°, 50°, 40°, 45°, 47.5°, 42.5° and 50° respectively.

[0042] This embodiment also provides a permanent magnet synchronous motor, which includes a stator lamination structure 100 and the aforementioned rotor lamination structure. The stator lamination structure 100 and the lamination body 1 are coaxially arranged around the outer periphery of the rotor lamination structure. A winding groove 120 is provided on the inner wall of the stator lamination structure 100. A flange is provided at the opening of the winding groove 120. The flange surrounds the opening of the winding groove 120 to form a narrow opening 110. The width of the narrow opening 110 is 1.5mm-1.7mm, and the width of the winding groove 120 is 4mm-5mm. The stator lamination structure 100 surrounds the outer periphery of the rotor lamination structure and the two can rotate relative to each other. Since the inner wall of the stator lamination structure 100 has a narrow opening 110 and a winding slot 120, when the stator lamination structure 100 and the rotor lamination structure rotate relative to each other, the narrow opening 110 and the winding slot 120 can cooperate with the harmonic slot group 13 to reduce the harmonic electromagnetic force of the motor, thereby effectively suppressing the noise and vibration generated during operation.

[0043] Specifically, the permanent magnet synchronous motor also includes a rotating shaft. A shaft hole is provided at the center of the lamination body 1. The rotating shaft passes through the shaft hole and drives the rotor lamination structure to rotate relative to the stator lamination structure 100. Its specific structure and working principle are common knowledge and will not be described in detail here.

[0044] In this embodiment, in the stator lamination structure 100, the width of the narrow opening 110 is preferably 1.6 mm, and the width of the winding slot 120 is preferably 4.5 mm; in the rotor lamination structure, the radius of the first harmonic circle is preferably 1.5 mm, the included angle between the two connecting sections 1312 is preferably 132°, the radius of the second harmonic circle is preferably 28.5 mm, the included angle between the sidewalls of the two first magnet slots 11 is preferably 102°, and the included angle between the sidewalls of the two second magnet slots 12 is preferably 168°; using the above technical solution and after experimental verification, the permanent magnet synchronous motor has the best noise reduction and vibration suppression effect, and the radial electromagnetic force of the motor's spatial zero-order and time-multiplied 48th order is 2702.956 N / m. 2 Reduced to 1194.313 N / m 2 This effectively improves the comfort of riding in the vehicle.

[0045] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A rotor lamination structure, characterized in that, The present invention includes a lamination body (1), wherein the lamination body (1) has a plurality of magnetic poles uniformly arranged in the circumferential direction, and each magnetic pole is provided with a first magnetic groove (11) and a second magnetic groove (12); Multiple harmonic groove groups (13) are uniformly opened along the circumferential direction on the outer peripheral surface of the lamination body (1). The harmonic groove groups (13) are symmetrically arranged with respect to the first symmetrical surface, which passes through the axis of the lamination body (1) radially.

2. The rotor lamination structure according to claim 1, characterized in that, The number of harmonic slots (13) is the same as the number of magnetic poles and they are arranged in a one-to-one correspondence.

3. The rotor lamination structure according to claim 2, characterized in that, The harmonic slot group (13) includes a first harmonic slot (131) and a second harmonic slot (132), wherein the first harmonic slot (131) and the second harmonic slot (132) are respectively symmetrically arranged with respect to the first symmetrical surface.

4. The rotor lamination structure according to claim 3, characterized in that, The first harmonic groove (131) includes an arc-shaped first groove bottom section (1311), the cross-sectional arc of the first groove bottom section (1311) is part of the first harmonic circle, and the radius of the first harmonic circle is 1.4mm-1.6mm.

5. The rotor lamination structure according to claim 4, characterized in that, The first harmonic channel (131) further includes a straight connecting section (1312) connecting both sides of the bottom section (1311) of the first channel, and the included angle between the two connecting sections (1312) is 120°-135°.

6. The rotor lamination structure according to claim 3, characterized in that, The second harmonic groove (132) includes an arc-shaped second groove bottom section (1321), the cross-sectional arc of the second groove bottom section (1321) is part of the second harmonic circle, and the radius of the second harmonic circle is 28mm-29mm.

7. The rotor lamination structure according to claim 3, characterized in that, The harmonic slot group (13) includes two first harmonic slots (131) and two second harmonic slots (132), with the two second harmonic slots (132) of the harmonic slot group (13) located between the two first harmonic slots (131).

8. The rotor lamination structure according to any one of claims 1-7, characterized in that, Each of the magnetic poles is symmetrically arranged with respect to a second symmetry plane, which passes radially through the axis of the lamination body (1).

9. The rotor lamination structure according to claim 8, characterized in that, Each of the magnetic poles has two first magnetic slots (11), which are symmetrically arranged on both sides of the second symmetry plane. The included angle between the sidewalls of the two first magnetic slots (11) near the outer peripheral surface is 100°-110°; and / or, each of the magnetic poles has two second magnetic slots (12), which are symmetrically arranged on both sides of the second symmetry plane. The included angle between the sidewalls of the two second magnetic slots (12) near the outer peripheral surface is 160°-170°.

10. A permanent magnet synchronous motor, characterized in that, The rotor lamination structure and stator lamination structure (100) as described in any one of claims 1-9 are included. The stator lamination structure (100) is coaxially arranged around the outer periphery of the rotor lamination structure with the lamination body (1). A winding groove (120) is provided on the inner wall of the stator lamination structure (100). A flange is provided at the opening of the winding groove (120). The flange surrounds the opening of the winding groove (120) to form a narrow opening (110). The width of the narrow opening (110) is 1.5mm-1.7mm, and the width of the winding groove (120) is 4mm-5mm.

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