Rotor punching sheet structure of low-noise high-speed permanent magnet motor

Abstract

The utility model discloses a rotor punching sheet structure of a low-noise high-speed permanent magnet motor, a rotor punching sheet body is equally divided into a plurality of unit magnetic poles, and a first V-shaped magnetic steel groove located at the inner side and a second V-shaped magnetic steel groove located at the outer side are symmetrically arranged in each magnetic pole; the rotor excircle of each unit magnetic pole is provided with a first auxiliary groove, a second auxiliary groove and an excircle arc section, and the excircle arc section, the two first auxiliary grooves and the two second auxiliary grooves are symmetrically arranged about the d-axis center line of the corresponding unit magnetic pole; the first auxiliary groove and the outer circle arc section are located within the magnetic bridge range of the second V-shaped magnetic steel groove and the outer circle of the rotor, and the second auxiliary groove is located outside the magnetic bridge range of the outer circle arc section and the first V-shaped magnetic steel groove and the outer circle of the rotor. Different auxiliary grooves and arc sections are arranged on the outer circle of the rotor, so that the waveform of an air-gap magnetic field is improved, the harmonic wave of the motor is reduced, the radial order electromagnetic force of the motor is reduced, the noise of the motor is reduced, and the motor has good NVH (Noise Vibration and Harshness) performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely relates to a low noise high speed permanent magnet motor rotor punching sheet structure. BACKGROUND

[0002] As Figure 12 Indicated, in prior art, discloses a built-in double V type topology structure, adopts double V shape magnetic circuit structure, obtains high saliency ratio through optimal V shape included angle, can realize the high performance of permanent magnet motor.

[0003] In above-mentioned technology, increase rectangular through -hole with fillet between a pair of second magnetic steel slot, make D axle magnetic resistance increase, thereby make motor obtain larger saliency ratio, improve the torque and power of motor, and through the cooperation of positioning hole on punching sheet body and positioning screw, realize the multi -section inclined pole of rotor. When the punching sheet is used on the motor of ultrahigh speed, the punching sheet strength and rotor mechanical property need to rely on the increase of the width of outer magnetic bridge to meet, reduce the torque density of motor, in addition, the torque ripple of motor, counter electromotive force harmonic and motor noise also can not be better improved. SUMMARY

[0004] In view of above-mentioned defects of prior art, provide low noise high speed permanent magnet motor rotor punching sheet structure, reduce the noise of motor.

[0005] The utility model discloses a technical scheme that is adopted to solve the above technical problems:

[0006] A low noise high speed permanent magnet motor rotor punching sheet structure, the rotor punching sheet body is equally divided into a plurality of unit magnetic poles, a first V-shaped magnetic steel slot located on the inner side and a second V-shaped magnetic steel slot located on the outer side are symmetrically arranged in each magnetic pole;

[0007] A first auxiliary slot, a second auxiliary slot and an outer circle arc segment are arranged on the rotor outer circle of each unit magnetic pole, the outer circle arc segment, the two first auxiliary slots and the two second auxiliary slots are symmetrically arranged about the d-axis center line of the unit magnetic pole; the first auxiliary slot and the outer circle arc segment are located within the magnetic bridge range between the second V-shaped magnetic steel slot and the rotor outer circle, and the second auxiliary slot is located outside the magnetic bridge range between the first V-shaped magnetic steel slot and the rotor outer circle.

[0008] According to the above technical scheme, the depth H7 of the first auxiliary slot is 0.8mm-1.2mm, the included angle γ1 between the connecting line of the concave point position of the first auxiliary slot and the center of the circle and the d-axis center line is 5.5°-6.5°, and the included angle γ2 between the connecting line of the starting position of the first auxiliary slot close to the q-axis center line and the center of the circle and the d-axis center line is 7.5°-8.5°.

[0009] The arc segment of the rotor outer circle is obtained by drawing a circle with three points, the concave points of the two first auxiliary grooves, the intersection of H8 and the d-axis center line, and the range of H8 is 0.15mm-0.25mm; the chamfer R of the connection between the first auxiliary groove and the rotor outer circle and the connection between the first auxiliary groove and the arc segment of the outer circle 12 is 2.5mm-3.5mm.

[0010] According to the above technical scheme, the second auxiliary groove is symmetrical about the d-axis center line, the depth H9 of the second auxiliary groove is 0.6mm-0.7mm, the included angle γ3 between the line connecting the concave point position of the second auxiliary groove and the center of the circle and the d-axis center line is 19.5°-20.5°, the included angle γ4 between the line connecting the concave point position of the second auxiliary groove and the center of the circle and the line connecting the end point of the second auxiliary groove and the center of the circle is 1°-1.5°, and the chamfer R of the connection between the concave point position of the second auxiliary groove and the rotor outer circle 13 is 1.5mm-2.5mm.

[0011] According to the above technical scheme, a quadrilateral-like magnetic barrier is arranged between the two magnetic steel grooves of the first V-shaped magnetic steel groove; two protrusions are arranged at the two ends of the inner edge line of the magnetic steel groove of the first V-shaped magnetic steel groove, two magnetic steel limiters are arranged at the two ends of the outer edge line of the magnetic steel groove of the first V-shaped magnetic steel groove, and a magnetic barrier matched with the quadrilateral-like magnetic barrier is arranged at the end of the two magnetic steel grooves of the first V-shaped magnetic steel groove close to the shaft hole.

[0012] Two magnetic steel limiters are arranged at the two ends of the outer edge line of the magnetic steel groove of the second V-shaped magnetic steel groove.

[0013] According to the above technical scheme, the two magnetic steel grooves of the first V-shaped magnetic steel groove are symmetrically arranged on the two sides of the d-axis, the included angle α1 between the two magnetic steel grooves is 65°-75°, the magnetic steel is arranged in the magnetic steel groove, the gap between the magnetic steel and the edge of the magnetic steel groove is 0.05mm-0.1mm, and the minimum distance H2 between the two magnetic steels is 11mm-13mm.

[0014] In the first V-shaped magnetic steel groove, a single magnetic steel groove sequentially includes a magnetic steel groove outer edge line, a lower limiter, a magnetic steel groove lower edge line, a lower protrusion line, a magnetic steel groove inner edge line, an upper protrusion line, a magnetic steel groove upper edge line, and a lower limiter, the magnetic steel groove outer edge line and the magnetic steel groove inner edge line are arranged in parallel, the magnetic steel groove upper edge line is arranged in parallel with the rotor outer circle, the magnetic steel groove lower edge line is divided into a first edge, a second edge and a third edge, the first edge is parallel to the edge line of the quadrilateral-like magnetic barrier, the second edge is parallel to the magnetic steel groove outer edge line, and the third edge is perpendicular to the magnetic steel groove outer edge line.

[0015] According to the above technical scheme, the diameter φ1 of the rotor outer circle is 140mm-150mm; in the first V-shaped magnetic steel groove,

[0016] The lower limit position is a right angle limit position, the length L1 of the lower limit position is 1.2mm-1.4mm, and the width W1 of the lower limit position is 1.0mm-1.4mm;

[0017] The upper limit position is an acute angle limit position, the length L1 of the upper limit position is 1.2mm-1.4mm, and the angle α4 between the two sides of the upper limit position is 75°-85°; the chamfer R5 between the upper limit position and the upper edge line of the magnetic steel slot is 0.6mm-1.0mm;

[0018] The third edge of the lower edge line of the magnetic steel slot starts at the end of the lower limit position, the distance L2 between the third edge end and the outer edge of the magnetic steel slot is 1.8mm-2.2mm, the first edge of the lower edge line of the magnetic steel slot starts at the intersection of the extension line of the inner edge of the magnetic steel slot and the extension line of the first edge, the angle α2 between the first edge and the inner edge line of the magnetic steel slot is 120°-130°, the chamfer R1 between the third edge and the second edge is 0.8mm-1.2mm, and the chamfer R2 between the second edge and the first edge is 1.8mm-2.2mm;

[0019] The starting position of the lower protruding edge line is 1.1mm-1.3mm away from the short side of the magnetic steel, the angle α3 between the lower protruding edge line and the inner edge of the magnetic steel slot is 140°-150°, the chamfer R3 between the lower protruding edge line and the first edge starting point of the lower edge line of the magnetic steel slot is 1.8mm-2.2mm, and the chamfer R4 between the lower protruding edge line and the inner edge line of the magnetic steel slot is 1.3mm-1.7mm;

[0020] The upper protruding part is divided into a fourth edge line and a fifth edge line, the starting point of the fourth edge line is the intersection of the extension line of the short side of the magnetic steel and the inner edge line of the magnetic steel slot, the angle α5 between the fourth edge line and the inner edge of the magnetic steel slot is 145°-155°, the angle α6 between the fifth edge line and the inner edge of the magnetic steel slot is 30°-32°, and the starting point of the fifth edge line is the intersection of the extension line of the inner edge line of the magnetic steel slot and the upper edge line of the magnetic steel slot; the chamfer R6 between the fourth edge line and the inner edge line of the magnetic steel slot is 0.6mm-1.0mm, the chamfer R7 between the fourth edge and the fifth edge is 0.6mm-1.0mm, and the chamfer R8 between the fifth edge and the upper edge line of the magnetic steel slot is 1.8mm-2.2mm;

[0021] The width H1 of the magnetic isolation bridge between the upper edge line of the magnetic steel slot and the outer circle of the rotor is 0.7mm-1.0mm.

[0022] According to the above technical solution, the quadrilateral-like magnetic barrier includes mutually parallel upper and lower edge lines, and left and right edge lines connected between the upper and lower edge lines;

[0023] The left side line is divided into a parallel section and a non-parallel section by a middle part, the first side of the parallel section is parallel to the first side of the lower edge line of the first V-shaped magnetic steel slot, and the distance H3 between the parallel section and the non-parallel section is 1.4mm-1.6mm; the non-parallel section is offset by a certain angle α7 to the middle part of the quadrilateral magnetic barrier, and the value range of α7 is 5°-10°; and the chamfer R9 of the parallel section and the non-parallel section is 8mm-12mm;

[0024] The lower edge line is a connecting line of the intersection point of the outer edge of the first V-shaped magnetic steel slot and the left side line of the magnetic barrier and the intersection point of the outer edge of the first V-shaped magnetic steel slot and the right side line, and the upper edge line is obtained by moving the connecting line of the intersection point of the inner edge of the first V-shaped magnetic steel slot and the left side line of the magnetic barrier and the intersection point of the inner edge of the first V-shaped magnetic steel slot and the right side line outward along the radial direction by H4, and the value range of H4 is 0.8mm-1.2mm; the chamfer R 10 of the left side line and the upper edge line, the left side line and the lower edge line, the right side line and the upper edge line, and the right side line and the lower edge line is 2.5mm-3.5mm.

[0025] According to the technical scheme, the two magnetic steel slots of the second V-shaped magnetic steel slot are symmetrically arranged on the two sides of the d-axis, the included angle β1 between the two magnetic steel slots is 90°-105°, the magnetic steel is arranged in the magnetic steel slot, the gap between the magnetic steel and the side of the magnetic steel slot is 0.05mm-0.1mm, and the minimum distance H5 between the two magnetic steels is 1.8mm-2.2mm.

[0026] In the second V-shaped magnetic steel slot,

[0027] The lower limit position is an obtuse angle limit position, the length L3 of the lower limit position is 1.0mm-1.2mm, and the included angle β2 between the two sides of the lower limit position is 125°-135°.

[0028] The upper limit position is an obtuse angle limit position, the length L3 of the upper limit position is 1.0mm-1.2mm, and the included angle β3 between the two sides of the upper limit position is 100°-110°.

[0029] The width H6 of the magnetic bridge between the two magnetic steel slots of the second V-shaped magnetic steel slot is 0.8mm-1.2mm; and the width of the magnetic bridge between the two magnetic steel slots of the second V-shaped magnetic steel slot and the outer circle of the rotor is H1.

[0030] The chamfer R 11 of each chamfer in the second V-shaped magnetic steel slot is 0.8mm-1.0mm.

[0031] According to the technical scheme, a same number of rivet holes and large-area weight-reducing holes as the number of poles of the motor are further formed in the rotor punching sheet.

[0032] According to the technical scheme, the rotor shaft hole is provided with a key groove with an offset angle and a marking groove.

[0033] The utility model has the following beneficial effects:

[0034] 1. Different auxiliary grooves and arc segments are arranged on the outer circle of the rotor, which improves the air gap magnetic field waveform, reduces the motor harmonics, reduces the radial order electromagnetic force of the motor, reduces the noise of the motor, and makes the motor have good NVH performance.

[0035] 2. Different positions, angles, and sizes of protrusions are arranged on the magnetic steel groove, and different shapes and angles of magnetic steel groove limit are arranged, which cooperates with the magnetic barrier of the first V-shaped magnetic steel groove in the middle shape optimization, optimizes the distribution of the rotor magnetic field, and effectively improves the magnetic line distribution of the rotor. In addition, the magnetic barrier of the first V-shaped magnetic steel groove in the middle shape optimization and the large size weight reduction hole on the punching sheet are arranged, which is beneficial to the weight reduction of the motor, meets the lightweight demand of the motor, improves the strength of the punching sheet and the mechanical performance during high speed operation.

[0036] 3. The rotor punching sheet is further provided with rivet holes and large area weight reduction holes with the same number as the motor pole number, which facilitates the stacking of the rotor punching sheet and reduces the rotational inertia of the rotor, which is beneficial to the weight reduction and high speed of the motor and meets the weight demand of the motor.

[0037] 4. The rotor shaft hole is provided with a key groove and a marking groove with an offset angle, which is beneficial to the axial segmented skew pole of the motor and improves the torque ripple and NVH performance of the motor.

[0038] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, the following will be described in detail with the preferred embodiments of the present application and the accompanying drawings. The specific implementation of the present application is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] The drawings described herein are used to provide further understanding of the present application, and form part of the present application. The schematic embodiments of the present application and their description are used to explain the present application, and do not constitute undue limitation on the present application.

[0040] Figure 1 is a structure schematic view of the embodiment provided by the present application;

[0041] Figure 2 is a rotor topology diagram of the embodiment provided by the present application;

[0042] Figure 3 is a first V-shaped magnetic steel groove detail of the embodiment provided by the present application Figure 1 ;

[0043] Figure 4 is a first V-shaped magnetic steel groove detail of the embodiment provided by the present application Figure 2 ;

[0044] Figure 5 This is a detailed drawing of the quadrilateral magnetic barrier provided in an embodiment of this utility model;

[0045] Figure 6 This is a detailed view of the second V-shaped magnet groove provided in the embodiment of this utility model;

[0046] Figure 7 This is a detailed view of the first auxiliary groove on the outer circle according to an embodiment of the present invention;

[0047] Figure 8 This is a detailed view of the outer circle second auxiliary groove provided in an embodiment of this utility model;

[0048] Figure 9 This is a comparison curve of the electromagnetic force of the 24th-order lamination provided in the embodiment of this utility model;

[0049] Figure 10 This is a comparison curve of the electromagnetic force of the 48th-order lamination provided in the embodiment of this utility model;

[0050] Figure 11 This is a simulation cloud diagram of the lamination stress provided in an embodiment of this utility model;

[0051] Figure 12 This is a structural diagram of existing technology;

[0052] In the figure, 1. Rotor lamination body; 2. First V-shaped magnet slot; 3. Second V-shaped magnet slot; 4. First auxiliary slot; 5. Second auxiliary slot; 6. Outer circular arc segment; 7. Quadrilateral magnetic barrier; 8. Magnet; 9. Rivet hole; 10. Large area weight reduction hole; 11. Keyway; 12. Marking slot; 13. Inner edge line of magnet slot; 14. Outer edge line of magnet slot; 15. Lower limit; 16. Upper limit; 17. Shaft hole; A. Center line of d-axis; B. Center line of q-axis. Detailed Implementation

[0053] The following is in conjunction with the appendix Figures 1-11 The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0054] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0056] Reference Figures 1-11 As shown, this utility model provides a low-noise, high-speed permanent magnet motor rotor lamination structure.

[0057] Example 1

[0058] It should be noted that the longer side of the magnetic groove near line A is the inner edge line 13 of the magnetic groove, and the longer side of the magnetic groove near line B is the outer edge line 14 of the magnetic groove. The limit on the outer edge of the magnetic groove near the shaft hole 17 is the lower limit 15, and the limit near the outer circle is the upper limit 16.

[0059] The rotor lamination body 1 is divided into multiple unit magnetic poles, and each magnetic pole is symmetrically provided with a first V-shaped magnetic steel groove 2 located on the inner side and a second V-shaped magnetic steel groove 3 located on the outer side.

[0060] Each unit magnetic pole has a first auxiliary slot 4, a second auxiliary slot 5, and an outer circular arc segment 6 on its outer circumference. The outer circular arc segment, the two first auxiliary slots, and the two second auxiliary slots are all symmetrically arranged about the d-axis centerline of their respective unit magnetic poles. The first auxiliary slot and the outer circular arc segment are located within the magnetic bridge range between the second V-shaped magnet slot and the outer circumference of the rotor, while the second auxiliary slot is located outside the magnetic bridge range between the first V-shaped magnet slot and the outer circumference of the rotor.

[0061] like Figure 7 As shown in Embodiment 1, a preferred design for the auxiliary groove and the outer circular arc segment is provided. The depth H7 of the first auxiliary groove is 0.8mm to 1.2mm, the angle γ1 between the line connecting the concave point of the first auxiliary groove and the center of the circle and the center line of the d-axis is 5.5° to 6.5°, and the angle γ2 between the line connecting the starting point of the first auxiliary groove near the center line of the q-axis and the center of the circle and the center line of the d-axis is 7.5° to 8.5°.

[0062] The arc segment of the rotor's outer circle is obtained by drawing a circle using three points: the concave points of the first auxiliary grooves on both sides, and the intersection of the distance H8 from the rotor's outer circle and the center line of the d-axis. The range of H8 is 0.15mm to 0.25mm. The chamfer R at the connection between the first auxiliary groove and the rotor's outer circle, and at the connection between the first auxiliary groove and the arc segment of the outer circle. 12 The thickness is 2.5mm to 3.5mm.

[0063] like Figure 8 As shown, the second auxiliary groove is symmetrical about the center line of the d-axis. The depth H9 of the second auxiliary groove is 0.6mm to 0.7mm. The angle γ3 between the line connecting the concave point of the second auxiliary groove and the center of the circle and the center line of the d-axis is 19.5° to 20.5°. The angle γ4 between the line connecting the concave point of the second auxiliary groove and the center of the circle and the line connecting the end point of the second auxiliary groove and the center of the circle is 1° to 1.5°. The chamfer R at the concave point of the second auxiliary groove and the connection point with the outer circle of the rotor is also shown. 13 All are 1.5mm to 2.5mm.

[0064] Example 2

[0065] The structure and principle of Embodiment 2 are similar to those of Embodiment 1. The difference is that, based on Embodiment 1, protrusions of different positions, angles and sizes are set on the magnet slots, as well as magnet slot limits of different shapes and angles. Combined with the magnetic barrier with optimized shape in the middle of the first V-shaped magnet slot, the distribution of the rotor magnetic field is optimized, and the distribution of the rotor's magnetic lines of force is effectively improved.

[0066] Specifically,

[0067] A quadrilateral magnetic barrier 7 is provided between the two magnetic grooves of the first V-shaped magnetic groove; two protrusions are provided at both ends of the inner edge line of the first V-shaped magnetic groove; two magnetic limiters are provided at both ends of the outer edge line of the first V-shaped magnetic groove; and magnetic barriers matching the quadrilateral magnetic barrier are provided at the ends of the two magnetic grooves of the first V-shaped magnetic groove near the shaft hole.

[0068] Two magnetic limiters are provided at both ends of the outer edge line of the second V-shaped magnetic groove.

[0069] In Example 1, the corresponding design shape and size range are given in conjunction with specific rotor laminations.

[0070] Taking a rotor outer diameter φ1 of 140mm to 150mm as an example:

[0071] 1. For example Figures 3-4As shown, the two magnetic steel grooves of the first V-shaped magnetic steel groove are symmetrically arranged on both sides of the d-axis, and the included angle a1 between the magnetic steel grooves is 65°-75°; the magnetic steel 8 is arranged in the magnetic steel groove, the gap between the magnetic steel and the edge of the magnetic steel groove is 0.05mm-0.1mm, and the minimum distance H2 between the two magnetic steels is 11mm-13mm;

[0072] In the first V-shaped magnetic steel groove, a single magnetic steel groove sequentially comprises a magnetic steel groove outer edge line, a lower limit, a magnetic steel groove lower edge line, a lower protruding line, a magnetic steel groove inner edge line, an upper protruding line, a magnetic steel groove upper edge line, and a lower limit, the magnetic steel groove outer edge line and the magnetic steel groove inner edge line are arranged in parallel, the magnetic steel groove upper edge line and the rotor outer circle are arranged in parallel, the magnetic steel groove lower edge line is divided into a first edge, a second edge and a third edge, the first edge is parallel to the quadrilateral magnetic barrier edge line, the second edge is parallel to the magnetic steel groove outer edge line, and the third edge is perpendicular to the magnetic steel groove outer edge line.

[0073] In the first V-shaped magnetic steel groove,

[0074] The lower limit is a right-angle limit, the length L1 of the lower limit is 1.2mm-1.4mm, and the width W1 of the lower limit is 1.0mm-1.4mm;

[0075] The upper limit is an acute-angle limit, the length L1 of the upper limit is 1.2mm-1.4mm, and the included angle a4 between the two edges of the upper limit is 75°-85°; the chamfer R5 of the upper limit and the magnetic steel groove upper edge line is 0.6mm-1.0mm;

[0076] The third edge of the magnetic steel groove lower edge line starts at the end of the lower limit, the distance L2 between the third edge end point and the magnetic steel groove outer edge is 1.8mm-2.2mm, the first edge of the magnetic steel groove lower edge line starts at the intersection of the magnetic steel groove inner edge extension line and the first edge extension line, the included angle a2 between the first edge and the magnetic steel groove inner edge line is 120°-130°, the chamfer R1 between the third edge and the second edge is 0.8mm-1.2mm, and the chamfer R2 between the second edge and the first edge is 1.8mm-2.2mm;

[0077] The starting point of the lower protruding edge line is 1.1mm-1.3mm away from the magnetic steel short edge, the included angle a3 between the lower protruding edge line and the magnetic steel groove inner edge is 140°-150°, the chamfer R3 between the lower protruding edge line and the first edge starting point of the magnetic steel groove lower edge line is 1.8mm-2.2mm, and the chamfer R4 between the lower protruding edge line and the magnetic steel groove inner edge line is 1.3mm-1.7mm;

[0078] The upper protrusion is divided into a fourth edge line and a fifth edge line, the starting point of the fourth edge line is the intersection of the extension line of the short side of the magnetic steel and the inner edge line of the magnetic steel slot, the included angle between the fourth edge line and the inner edge of the magnetic steel slot is α5, which is 145°-155°, the included angle between the fifth edge line and the inner edge of the magnetic steel slot is α6, which is 30°-32°, the starting point of the fifth edge line is the intersection of the extension line of the inner edge line of the magnetic steel slot and the upper edge line of the magnetic steel slot; the chamfer R6 between the fourth edge line and the inner edge line of the magnetic steel slot is 0.6mm-1.0mm, the chamfer R7 between the fourth edge and the fifth edge is 0.6mm-1.0mm, and the chamfer R8 between the fifth edge and the upper edge line of the magnetic steel slot is 1.8mm-2.2mm;

[0079] The width H1 of the magnetic isolation bridge between the upper edge line of the magnetic steel slot and the outer circle of the rotor is 0.7mm-1.0mm.

[0080] 2. As shown in Figure 5 and 11 , the quadrilateral-like magnetic barrier includes mutually parallel upper and lower edge lines, and left and right edge lines connected between the upper and lower edge lines;

[0081] The left and right edge lines are divided into parallel segments and non-parallel segments by the middle part, the parallel segments are arranged in parallel with the first edge of the first V-shaped magnetic steel slot lower edge line, and the distance H3 between them is 1.4mm-1.6mm; the non-parallel segments are offset by a certain angle α7 to the middle part of the quadrilateral-like magnetic barrier, and the value of α7 is 5°-10°; the chamfer R9 of the parallel segments and the non-parallel segments is 8mm-12mm;

[0082] The lower edge line is the connecting line of the intersection point of the first V-shaped magnetic steel slot outer edge and the left edge line of the magnetic barrier and the intersection point of the first V-shaped magnetic steel slot outer edge and the right edge line, and the upper edge line is obtained by translating the connecting line of the intersection point of the first V-shaped magnetic steel slot inner edge and the left edge line of the magnetic barrier and the intersection point of the first V-shaped magnetic steel slot inner edge and the right edge line outward along the radial direction by H4, and the value of H4 is 0.8mm-1.2mm; the chamfer R10 between the left edge line and the upper edge line, the left edge line and the lower edge line, the right edge line and the upper edge line, and the right edge line and the lower edge line is 2.5mm-3.5mm. 10

[0083] 3. As shown in Figure 6 , the two magnetic steel slots of the second V-shaped magnetic steel slot are symmetrically arranged on both sides of the d-axis, and the included angle β1 between the two magnetic steel slots is 90°-105°; the magnetic steel is arranged in the magnetic steel slot, the gap between the magnetic steel and the edge of the magnetic steel slot is 0.05mm-0.1mm, and the minimum distance H5 between the two magnetic steels is 1.8mm-2.2mm;

[0084] In the second V-shaped magnetic steel slot,

[0085] The lower limit position is an obtuse angle limit position, the length L3 of the lower limit position is 1.0mm-1.2mm, and the included angle β2 of the two edges of the lower limit position is 125°-135°.​

[0086] The upper limit position is an obtuse angle limit position, the length L3 of the upper limit position is 1.0mm-1.2mm, and the two edges of the upper limit position form an angle β3 of 100°-110°;

[0087] The width H6 of the magnetic bridge between the two magnetic steel grooves of the second V-shaped magnetic steel groove is 0.8mm-1.2mm; and the width of the magnetic bridge between the two magnetic steel grooves of the second V-shaped magnetic steel groove and the outer circle of the rotor is H1;

[0088] The chamfer R in each of the second V-shaped magnetic steel grooves is 0.8mm-1.0mm. 11

[0089] In the embodiments 1-2, the rivet holes 9 and the large-area weight-reducing holes 10 are further formed in the rotor punching sheet, the number of the rivet holes 9 is the same as the number of the motor poles, the large-area weight-reducing holes 10 facilitate the stacking of the rotor punching sheet, and the rotor punching sheet can reduce the moment of inertia of the rotor, facilitate the weight reduction and high speed of the motor, and meet the weight requirement of the motor. The key groove 11 with an offset angle and the marking groove 12 are formed in the rotor shaft hole, which facilitates the axial segmented skew pole of the motor, and improves the torque ripple and NVH performance of the motor.

[0090] The above is only a preferred embodiment of the present application, and does not limit the present application in any form; any ordinary technical personnel in the industry can implement the present application according to the above description and the drawings; however, any equivalent changes, modifications and evolution of the above-mentioned technical content within the scope of the technical scheme of the present application are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolution of the above-mentioned technical content within the scope of the technical scheme of the present application are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolution of the above-mentioned technical content within the scope of the technical scheme of the present application are equivalent embodiments of the present application.​

Claims

1. A low-noise high-speed permanent magnet motor rotor lamination structure, the rotor lamination body is equally divided into a plurality of unit magnetic poles, a first V-shaped magnetic steel slot located at the inner side and a second V-shaped magnetic steel slot located at the outer side are symmetrically arranged in each magnetic pole; characterized in that a first auxiliary slot, a second auxiliary slot, and an outer circle arc segment are arranged on the outer circle of each unit magnetic pole, the outer circle arc segment, the two first auxiliary slots, and the two second auxiliary slots are symmetrically arranged about the d-axis center line of the unit magnetic pole; the first auxiliary slot and the outer circle arc segment are located in the magnetic bridge range between the second V-shaped magnetic steel slot and the outer circle of the rotor, and the second auxiliary slot is located outside the magnetic bridge range between the outer circle arc segment and the first V-shaped magnetic steel slot.

2. The low noise high speed permanent magnet motor rotor lamination structure of claim 1, wherein: The depth H7 of the first auxiliary slot is 0.8mm-1.2mm, the included angle γ1 between the line connecting the concave point position of the first auxiliary slot and the center of the circle and the d-axis center line is 5.5°-6.5°, and the included angle γ2 between the line connecting the starting position of the first auxiliary slot close to the q-axis center line and the center of the circle and the d-axis center line is 7.5°-8.5°; The arc segment of the rotor outer circle is obtained by drawing a circle with the three points of the concave points of the two first auxiliary grooves, the intersection of the H8 of the rotor outer circle and the d-axis center line, and the range of H8 is 0.15mm-0.25mm; the chamfer R of the connection of the first auxiliary groove and the rotor outer circle and the connection of the first auxiliary groove and the outer circle arc segment 12 is 2.5mm-3.5mm.

3. The low noise high speed permanent magnet motor rotor lamination structure of claim 1, wherein: The second auxiliary groove is symmetrical about the d-axis center line, the depth H9 of the second auxiliary groove is 0.6mm-0.7mm, the included angle γ3 between the line connecting the concave point position of the second auxiliary groove and the center of the circle and the d-axis center line is 19.5°-20.5°, the included angle γ4 between the line connecting the concave point position of the second auxiliary groove and the center of the circle and the line connecting the end point of the second auxiliary groove and the center of the circle is 1°-1.5°, and the chamfer R at the connection between the concave point position of the second auxiliary groove and the outer circle of the rotor is 1.5mm-2.5mm. 13 ​ 4. The low noise high speed permanent magnet motor rotor lamination structure of claim 1, wherein: A quadrilateral-like magnetic barrier is arranged between the two magnetic steel slots of the first V-shaped magnetic steel slot; two protrusions are arranged at the two ends of the inner edge line of the magnetic steel slot of the first V-shaped magnetic steel slot, two magnetic steel limiters are arranged at the two ends of the outer edge line of the magnetic steel slot of the first V-shaped magnetic steel slot, and a magnetic barrier matched with the quadrilateral-like magnetic barrier is arranged at the end of the two magnetic steel slots of the first V-shaped magnetic steel slot close to the shaft hole; Two magnetic steel limiters are arranged at the two ends of the outer edge line of the magnetic steel slot of the second V-shaped magnetic steel slot. 5.The low-noise high-speed permanent magnet motor rotor lamination structure according to claim 4, characterized in that: the two magnetic steel slots of the first V-shaped magnetic steel slot are symmetrically arranged on the two sides of the d-axis, and the included angle α1 between the two magnetic steel slots is 65°-75°; the magnetic steel is arranged in the magnetic steel slot, the gap between the magnetic steel and the side of the magnetic steel slot is 0.05mm-0.1mm, and the minimum distance H2 between the two magnetic steels is 11mm-13mm; in the first V-shaped magnetic steel slot, a single magnetic steel slot sequentially includes a magnetic steel slot outer edge line, a lower limiter, a magnetic steel slot lower edge line, a lower protrusion line, a magnetic steel slot inner edge line, an upper protrusion line, a magnetic steel slot upper edge line, and a lower limiter, the magnetic steel slot outer edge line and the magnetic steel slot inner edge line are arranged in parallel, the magnetic steel slot upper edge line is arranged in parallel with the rotor outer circle, the magnetic steel slot lower edge line is divided into a first edge, a second edge, and a third edge, the first edge is parallel to the edge line of the quadrilateral-like magnetic barrier, the second edge is parallel to the magnetic steel slot outer edge line, and the third edge is perpendicular to the magnetic steel slot outer edge line.

6. The low noise high speed permanent magnet motor rotor lamination structure of claim 5, wherein: The diameter φ1 of the rotor outer circle is 140mm-150mm; in the first V-shaped magnetic steel slot, the lower limiter is a right-angle limiter, the length L1 of the lower limiter is 1.2mm-1.4mm, and the width W1 of the lower limiter is 1.0mm-1.4mm; the upper limiter is an acute-angle limiter, the length L1 of the upper limiter is 1.2mm-1.4mm, the included angle α4 between the two sides of the upper limiter is 75°-85°, and the chamfer R5 of the upper limiter and the magnetic steel slot upper edge line is 0.6mm-1.0mm; The third edge of the lower edge line of the magnetic steel slot starts at the end of the lower limit, and the distance L2 between the end of the third edge and the outer edge of the magnetic steel slot is 1.8mm-2.2mm; the first edge of the lower edge line of the magnetic steel slot starts at the intersection of the extension line of the inner edge of the magnetic steel slot and the extension line of the first edge, and the included angle α2 between the first edge and the inner edge of the magnetic steel slot is 120°-130°; the right angle chamfer R1 between the third edge and the second edge is 0.8mm-1.2mm, and the chamfer R2 between the second edge and the first edge is 1.8mm-2.2mm; The distance W2 between the starting point of the lower protruding edge line and the short edge of the magnetic steel is 1.1mm-1.3mm, the included angle α3 between the lower protruding edge line and the inner edge of the magnetic steel slot is 140°-150°, the chamfer R3 between the lower protruding edge line and the first edge starting point of the lower edge line of the magnetic steel slot is 1.8mm-2.2mm, and the chamfer R4 between the lower protruding edge line and the inner edge line of the magnetic steel slot is 1.3mm-1.7mm; The upper protruding edge line is divided into a fourth edge line and a fifth edge line, the starting point of the fourth edge line is the intersection of the extension line of the short edge of the magnetic steel and the inner edge line of the magnetic steel slot, the included angle α5 between the fourth edge line and the inner edge of the magnetic steel slot is 145°-155°, the included angle α6 between the fifth edge line and the inner edge of the magnetic steel slot is 30°-32°, and the starting point of the fifth edge line is the intersection of the extension line of the inner edge line of the magnetic steel slot and the upper edge line of the magnetic steel slot; the chamfer R6 between the fourth edge line and the inner edge line of the magnetic steel slot is 0.6mm-1.0mm, the chamfer R7 between the fourth edge and the fifth edge is 0.6mm-1.0mm, and the chamfer R8 between the fifth edge and the upper edge line of the magnetic steel slot is 1.8mm-2.2mm; The width H1 of the magnetic isolation bridge between the upper edge line of the magnetic steel slot and the outer circle of the rotor is 0.7mm-1.0mm.

7. The low noise high speed permanent magnet motor rotor lamination structure of claim 5 or 6, wherein: The quadrilateral-like magnetic barrier includes upper and lower edge lines parallel to each other, and left and right edge lines connected between the upper and lower edge lines; The left and right edge lines are divided into parallel sections and non-parallel sections by the middle section, the parallel sections are arranged in parallel with the first edge of the lower edge line of the first V-shaped magnetic steel slot, and the distance H3 between the parallel sections is 1.4mm-1.6mm; the non-parallel sections are offset by a certain angle α7 to the middle part of the quadrilateral-like magnetic barrier, and the value of α7 is 5°-10°; the chamfer R9 of the parallel sections and the non-parallel sections is 8mm-12mm; The lower edge line is a connecting line of the intersection of the outer edge of the first V-shaped magnetic steel slot and the left edge line of the magnetic barrier and the intersection of the outer edge of the first V-shaped magnetic steel slot and the right edge line, and the upper edge line is obtained by translating the connecting line of the intersection of the inner edge of the first V-shaped magnetic steel slot and the left edge line of the magnetic barrier and the intersection of the inner edge of the first V-shaped magnetic steel slot and the right edge line outward in the radial direction by H4, wherein the value of H4 is in the range of 0.8mm to 1.2mm; the chamfer R between the left edge line and the upper edge line, the left edge line and the lower edge line, the right edge line and the upper edge line, and the right edge line and the lower edge line is 2.5mm to 3.5mm. 10 2.5mm to 3.5mm.

8. The low noise high speed permanent magnet motor rotor lamination structure of claim 6, wherein: The two magnetic steel slots of the second V-shaped magnetic steel slot are symmetrically arranged on both sides of the d-axis, the included angle β1 between the two magnetic steel slots is 90°-105°; the magnetic steel is arranged in the magnetic steel slot, the gap between the magnetic steel and the edge of the magnetic steel slot is 0.05mm-0.1mm, and the minimum distance H5 between the two magnetic steels is 1.8mm-2.2mm; In the second V-shaped magnetic steel slot, The lower limit is an obtuse angle limit, the length L3 of the lower limit is 1.0mm-1.2mm, and the included angle β2 between the two edges of the lower limit is 125°-135°; The upper limit is an obtuse angle limit, the length L3 of the upper limit is 1.0mm-1.2mm, and the included angle β3 between the two edges of the upper limit is 100°-110°; The width H6 of the middle magnetic isolation bridge between the two magnetic steel slots of the second V-shaped magnetic steel slot is 0.8mm-1.2mm; the width of the magnetic isolation bridge between the two magnetic steel slots of the second V-shaped magnetic steel slot and the outer circle of the rotor is H1. In the second V-shaped magnetic steel slot, each chamfer R 11 is 0.8mm-1.0mm.

9. The low noise high speed permanent magnet motor rotor lamination structure of claim 1, wherein: In the rotor lamination, rivet holes and large area lightening holes are formed in the same number as the motor poles.

10. The low noise high speed permanent magnet motor rotor lamination structure of claim 1, wherein: The rotor shaft hole is provided with a key groove with an offset angle and a mark groove.

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