Rotor punching sheet of high-speed permanent magnet synchronous motor

Abstract

The invention provides a high-speed permanent magnet synchronous motor rotor punching sheet, and relates to the technical field of permanent magnet synchronous motors. The rotor punching sheet is designed according to the following steps that according to symmetry, one pole of the motor rotor punching sheet is designed to be a sector, the unfolding angle of the sector is 180 / p degrees, and p is the number of pole pairs; taking the central axis of the sector, the boundary straight line and the inner arc line of the motor stator as the reference, drawing the boundary positions of the holes by adopting a geometric construction method, part of the holes being used for inserting the permanent magnets, and the permanent magnets in the holes being the same in specification. According to the high-speed permanent magnet rotor punching sheet, the serialized high-speed permanent magnet rotor punching sheet can be rapidly designed, the weight of a rotor can be reduced, the stress of a rotor reinforcing rib is reduced, the no-load cogging torque of the rotor and the torque fluctuation during loading are reduced, the standardization and serialization level is improved, and then the motor cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet synchronous motors, and in particular to a high-speed permanent magnet synchronous motor rotor punching sheet. Background Art

[0002] The permanent magnet synchronous motor rotor adopts a permanent magnet insertion structure, which reduces the difficulty of permanent magnet rotor manufacturing and facilitates automated mass production. However, when the permanent magnet inner rotor runs at high speed, the pole area of ​​the traditional V-type and type I permanent magnet insertion topology structure is too large, resulting in excessive centrifugal stress in the magnetic bridge part, and the rotor weight is large, which limits the increase in the maximum speed.

[0003] Invention patents CN112653274 B "Rotor punching and permanent magnet motor rotor" and CN109742879B "A permanent magnet motor rotor structure" all use permanent magnet slots corresponding to V-shaped and type I rectangular permanent magnets. The silicon steel sheet part on the outside of the permanent magnet has a larger area and the stress at the magnetic bridge is larger.

[0004] Therefore, in order to increase the speed of the permanent magnet motor, it is necessary to provide a built-in permanent magnet synchronous motor rotor punching suitable for high-speed operation, reduce the weight of the high-speed motor rotor, reduce the centrifugal stress, reduce the no-load cogging torque, reduce the load torque fluctuation, and realize the serialized high-speed permanent magnet rotor punching design. Summary of the invention

[0005] The purpose of the present invention is to provide a high-speed permanent magnet synchronous motor rotor punching sheet to solve the problem of serialized rapid design of high-speed permanent magnet synchronous motor rotor punching sheets in view of the above-mentioned deficiencies in the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides a high-speed permanent magnet synchronous motor rotor punching sheet, and the rotor punching sheet is designed according to the following steps:

[0008] S1: According to symmetry, one pole of the motor rotor punching sheet is designed as a sector, the expansion angle of the sector is 180 / p degrees, p is the number of pole pairs, and the rotor structure under one pole is symmetrical about the central axis X of the sector, the left boundary straight line of the sector is Y, the part of the inner circle of the motor stator corresponding to the one pole is the arc L1, the center of the circle is the center of the motor shaft O, the radius of the arc L1 is R1, the arc L1 is offset toward the center of the circle by the air gap length g1 to obtain the outer circle boundary arc L2 of the motor rotor, the radius of L2 is R2, R2=R1-g1, and the intersection of the arc L2 and the central axis X is S;

[0009] S2: Draw a pair of rays passing through the center O and symmetrical about the central axis X. The angle between the pair of rays is a1. The intersection point of one of the pair of rays between the central axis X and the boundary line Y and the arc L2 is P;

[0010] S3: Given a point Q on OP, the length of the line segment PQ is g2;

[0011] S4: draw an arc L3 through fixed points Q and S with its center on the central axis X. The center of the arc L3 is O1, the radius of the arc L3 is R3, and the contact point between the arc L3 and the boundary line Y is rounded by r1. The rounded arc L3 is the outer boundary of the rotor punching.

[0012] S5: The arc L3 is offset toward the center by a distance g3 to obtain an arc L4, whose radius is R4, R4=R3-g3, and the arc L4 intersects the central axis X at point T;

[0013] S6: The arc L4 is offset toward the center by a distance h1 to obtain the arc L5, whose radius is R5, R5 = R3-g3-h1, and the arc L5 intersects the central axis X at point U;

[0014] S7: The boundary line Y is rotated by an angle a2 with O as the center toward the central axis X to obtain the line OB, which intersects L4 and point B. Draw a line BC parallel to the boundary line Y through point B, and BC intersects L5 at point C;

[0015] S8: The central axis X rotates around O in the direction of the boundary line Y by an angle of a3 / 2 to obtain the line OA, which intersects L4 at point A. The line O1A is offset left and right by a distance of g4 / 2 to obtain line segments DE and FG, which intersect L4 at points E and G respectively, and DE and FG intersect L5 at points D and F respectively. The angle between O1A and Y is set to a4;

[0016] Go to S9.1 or S10.1 or S11.1;

[0017] S9.1: The center axis X is offset toward the boundary line Y by a distance g4 / 2 to obtain a line segment JL, which intersects L4 at point J and intersects L5 at point L;

[0018] S9.2: A hole is formed by the straight line and arc through the four points FGJL, and another hole is formed by the arc and straight line through the four points EDCB. The above two holes are mirrored about the central axis to form four holes, of which the two holes close to the central axis X are used to insert permanent magnets. The specifications of the permanent magnets in the holes are the same. The two holes far from the central axis are empty slots, and the sharp corners of each hole are rounded;

[0019] Go to step S12;

[0020] S10.1: The central axis X is rotated about O1 in the direction of the boundary line Y by an angle a5 to obtain a straight line O1H, which intersects L4 at point H, where a5 = a4 / 3;

[0021] S10.2: Line O1H is offset to the left and right by a distance of g4 / 2 to obtain line segments JL and KM. JL and KM intersect L4 at points J and K, respectively. JL and KM intersect L5 at points L and M, respectively.

[0022] S10.3: A hole is formed by the straight line and arc through the four points of TKMU, another hole is formed by the arc and straight line through the four points of JLFG, and another hole is formed by the arc and straight line through the four points of EDCB. The above three holes are mirrored about the central axis to form five holes, of which the three holes in the middle are used to insert permanent magnets. The permanent magnets in the holes have the same specifications. The two holes far from the central axis are empty slots, and the sharp corners of each hole are rounded;

[0023] Go to step S12;

[0024] S11.1: The center axis X is offset toward the boundary line Y by a distance g4 / 2 to obtain a line segment NV, which intersects L4 at point N and intersects L5 at point V;

[0025] S11.2: The central axis X is rotated about O1 in the direction of the boundary line Y by an angle a5 to obtain a straight line O1H, which intersects L4 at point H, where a5 = a4 / 2;

[0026] S11.3: Line O1H is offset to the left and right by a distance of g4 / 2, obtaining line segments JL and KM. JL and KM intersect L4 at points J and K, respectively. JL and KM intersect L5 at points L and M, respectively.

[0027] S11.4: A hole is formed by the straight line and arc through the four points KMVN, another hole is formed by the arc and straight line through the four points JLFG, and another hole is formed by the arc and straight line through the four points EDCB. The above three holes are mirrored about the central axis to form six holes, of which the four middle holes are used to insert permanent magnets. The permanent magnets in the holes have the same specifications. The two holes far from the central axis are empty slots, and the sharp corners of each hole are rounded;

[0028] S12: Replicate the hole structure under other residual poles through a circular array.

[0029] Optionally, arc L5 is offset by a distance h2 toward the center of the circle to obtain arc L6; the inner arc L8 of the rotor is offset by a distance h3 away from the center of the circle to obtain arc L7; a straight line L9 is drawn through point U, and the angle between L9 and the central axis X is a6, and a6 is 40 degrees to 50 degrees; the boundary straight line Y is offset by a distance h4 toward the center midline X to obtain a straight line L 10 The arcs L6, L7 and the straight lines L9, L10 and the center axis X, the hole is mirrored about the center axis X to form a large hole, where the fillet r2 between L6 and L9, L 10 and L9, r3, L7 and L 10 The fillet r4 is chamfered between the two electrodes. The hole structure under the other residual poles is replicated by the circular array.

[0030] Optionally, in S1, the pole pair number p is one of the following: 2, 3, 4; the value range of the radius R1 is: 30 mm to 175 mm.

[0031] Optionally, in S2, the value range of a1 is: 0.88×180 / p degrees to 0.92×180 / p degrees; in S3, the value range of g2 is: g1 to 2×g1.

[0032] Optionally, in S5, the value range of g3 is: 0.5 mm to 2 mm.

[0033] Optionally, in S6, the value range of h1 is: 3×g1 to 4×g1.

[0034] Optionally, in S7, the value range of a2 is: 0.024×180 / p degree to 0.026×180 / p degree.

[0035] Optionally, in S8, the value range of a3 is: 0.64×180 / p degree to 0.80×180 / p degree; in S8, the value range of g4 is: 0.4 mm to 2 mm.

[0036] Optionally, in S12, the value range of h2 is: 0.2×R1 / p to 0.4×R1 / p, the value range of h3 is: 0.2×R1 / p to 0.5×R1 / p, the value range of h4 is: 0.07×R1 / p to 0.5×R1 / p, the value range of r2 is: 0.04×R1 / p to 0.4×R1 / p, the value range of r3 is: 0.04×R1 / p to 0.2×R1 / p, and the value range of r4 is: 0.04×R1 / p to 0.2×R1 / p.

[0037] Optionally, the cavity where the permanent magnet slot is located is filled with insulating material to reduce the maximum stress of the rotor.

[0038] The beneficial effects of the present invention include:

[0039] The rotor punching provided by the present invention is designed according to the following steps: according to symmetry, one pole of the motor rotor punching is designed as a sector, the expansion angle of the sector is 180 / p degrees, and p is the number of pole pairs; based on the central axis of the sector, the boundary straight line and the inner arc line of the motor stator, the boundary position of the hole is drawn by geometric drawing method, and some of the holes are used to insert permanent magnets, and the specifications of the permanent magnets in the holes are the same. The present invention can quickly design serialized high-speed permanent magnet rotor punchings, and the high-speed permanent magnet rotor punchings of the present invention can reduce the weight of the rotor, reduce the stress of the rotor reinforcement ribs, reduce the rotor no-load cogging torque and torque fluctuation under load, improve the level of standardization and serialization, and thus reduce the cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1A A schematic structural diagram of one pole of a rotor punching sheet of a 4-pole permanent magnet synchronous motor provided by an embodiment of the present invention is shown;

[0042] Figures 1B to 1D Shows Figure 1A A partial enlarged view of

[0043] Figure 2 A schematic structural diagram of one pole of a rotor punching sheet of a 4-pole permanent magnet synchronous motor provided by an embodiment of the present invention is shown;

[0044] Figure 3A A schematic structural diagram of one pole of another 4-pole permanent magnet synchronous motor rotor punching sheet provided by an embodiment of the present invention is shown;

[0045] Figure 3B and Figure 3C Shows Figure 3A A partial enlarged view of

[0046] Figure 4A A schematic structural diagram of one pole of a rotor punching sheet of a 4-pole permanent magnet synchronous motor provided by an embodiment of the present invention is shown;

[0047] FIG. 4B to FIG. 4D Shows Figure 4A A partial enlarged view of

[0048] Figure 5 A schematic structural diagram of a 4-pole complete rotor punching sheet with permanent magnets inserted therein provided by an embodiment of the present invention is shown.

[0049] Figure 6 A schematic structural diagram of a 6-pole complete rotor punching inserted with permanent magnets provided in an embodiment of the present invention is shown.

[0050] Figure 7 A schematic structural diagram of an 8-pole complete rotor punching inserted with permanent magnets provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The permanent magnet synchronous motor rotor adopts a permanent magnet plug-in structure, which reduces the difficulty of permanent magnet rotor manufacturing and facilitates automated mass production. However, when the permanent magnet inner rotor runs at high speed, the pole area of ​​the traditional V-type and type I permanent magnet plug-in topology structure is too large, resulting in excessive centrifugal stress in the magnetic bridge part, and the rotor weight is large, which limits the increase in the maximum speed. Therefore, it is necessary to provide a high-speed plug-in structure permanent magnet synchronous motor rotor punching to reduce the rotor weight, reduce the centrifugal stress on the rotor magnetic bridge, and ensure low no-load cogging torque and torque fluctuation under load.

[0053] Figure 1A and Figure 2 A schematic structural diagram of one pole of a permanent magnet synchronous motor rotor punching sheet provided by an embodiment of the present invention is shown; Figures 1B to 1D They are Figure 1A Enlarged view of parts I, II, and III in the middle, and the enlargement ratio is 2:1.

[0054] Figure 3A A schematic structural diagram of one pole of another permanent magnet synchronous motor rotor punching sheet provided by an embodiment of the present invention is shown. Figure 3B and Figure 3C They are Figure 3A The enlarged view of parts I and II in the middle is at a magnification ratio of 2:1.

[0055] Figure 4A A schematic structural diagram of one pole of another permanent magnet synchronous motor rotor punching sheet provided by an embodiment of the present invention is shown; FIG. 4B to FIG. 4D They are Figure 4A Enlarged view of parts I, II, and III in the middle, and the enlargement ratio is 2:1.

[0056] Figure 5FIG. 1 shows a schematic structural diagram of a complete rotor punching sheet with permanent magnets inserted therein provided by an embodiment of the present invention. Figure 6 A schematic structural diagram of a 6-pole complete rotor punching sheet with permanent magnets inserted therein provided by an embodiment of the present invention is shown; Figure 7 A schematic structural diagram of an 8-pole complete rotor punching inserted with permanent magnets provided by an embodiment of the present invention is shown.

[0057] exist Figure 1A and Figure 2 In the case of a magnet, each pole has two permanent magnet slots; Figure 3A In the case of a magnet, each pole has three permanent magnet slots; Figure 4A There are 4 permanent magnet slots per pole. Figures 1A to 4A As shown, increasing the number of permanent magnet slots can reduce the centrifugal stress of the magnetic bridge without increasing the width of the magnetic bridge, reduce the width dimension of the permanent magnet, and avoid the permanent magnet being too flat. Figure 5 In FIG. 5 , a permanent magnet 51 and a silicon steel sheet 52 are shown; Figure 6 In FIG. 6 , a permanent magnet 61 and a silicon steel sheet 62 are shown; in FIG. Figure 7 In FIG. 7 , a permanent magnet 71 and a silicon steel sheet 72 are shown.

[0058] The following will refer to Figures 1A to 7 The technical solution of the present invention is described in detail.

[0059] The present invention provides a high-speed permanent magnet synchronous motor rotor punching sheet, and the rotor punching sheet is designed according to the following steps:

[0060] S1: According to symmetry, one pole of the motor rotor punching sheet is designed as a sector, the expansion angle of the sector is 180 / p degrees, p is the number of pole pairs, and the rotor structure under one pole is symmetrical about the central axis X of the sector, the left boundary straight line of the sector is Y, the part of the inner circle of the motor stator corresponding to the one pole is the arc L1, the center of the circle is the center of the motor shaft O, the radius of the arc L1 is R1, the arc L1 is offset toward the center of the circle by the air gap length g1 to obtain the outer circle boundary arc L2 of the motor rotor, the radius of L2 is R2, R2=R1-g1, and the intersection of the arc L2 and the central axis X is S;

[0061] S2: Draw a pair of rays passing through the center O and symmetrical about the central axis X. The angle between the pair of rays is a1. The intersection point of one of the pair of rays between the central axis X and the boundary line Y and the arc L2 is P;

[0062] S3: Given a point Q on OP, the length of the line segment PQ is g2;

[0063] S4: draw an arc L3 through fixed points Q and S with its center on the central axis X. The center of the arc L3 is O1, the radius of the arc L3 is R3, and the contact point between the arc L3 and the boundary line Y is rounded by r1. The rounded arc L3 is the outer boundary of the rotor punching.

[0064] S5: The arc L3 is offset toward the center by a distance g3 to obtain an arc L4, whose radius is R4, R4=R3-g3, and the arc L4 intersects the central axis X at point T;

[0065] S6: The arc L4 is offset toward the center by a distance h1 to obtain the arc L5, whose radius is R5, R5 = R3-g3-h1, and the arc L5 intersects the central axis X at point U;

[0066] S7: The boundary line Y is rotated by an angle a2 with O as the center toward the central axis X to obtain the line OB, which intersects L4 and point B. Draw a line BC parallel to the boundary line Y through point B, and BC intersects L5 at point C;

[0067] S8: The central axis X rotates around O in the direction of the boundary line Y by an angle of a3 / 2 to obtain the line OA, which intersects L4 at point A. The line O1A is offset left and right by a distance of g4 / 2 to obtain line segments DE and FG, which intersect L4 at points E and G respectively, and DE and FG intersect L5 at points D and F respectively. The angle between O1A and Y is set to a4;

[0068] Go to S9.1 or S10.1 or S11.1;

[0069] S9.1: The center axis X is offset toward the boundary line Y by a distance g4 / 2 to obtain a line segment JL, which intersects L4 at point J and intersects L5 at point L;

[0070] S9.2: A hole is formed by the straight line and arc through the four points FGJL, and another hole is formed by the arc and straight line through the four points EDCB. The above two holes are mirrored about the central axis to form four holes, of which the two holes close to the central axis X are used to insert permanent magnets. The specifications of the permanent magnets in the holes are the same. The two holes far from the central axis are empty slots, and the sharp corners of each hole are rounded;

[0071] Go to step S12;

[0072] S10.1: The central axis X is rotated about O1 in the direction of the boundary line Y by an angle a5 to obtain a straight line O1H, which intersects L4 at point H, where a5 = a4 / 3;

[0073] S10.2: Line O1H is offset to the left and right by a distance of g4 / 2 to obtain line segments JL and KM. JL and KM intersect L4 at points J and K, respectively. JL and KM intersect L5 at points L and M, respectively.

[0074] S10.3: A hole is formed by the straight line and arc through the four points of TKMU, another hole is formed by the arc and straight line through the four points of JLFG, and another hole is formed by the arc and straight line through the four points of EDCB. The above three holes are mirrored about the central axis to form five holes, of which the three holes in the middle are used to insert permanent magnets. The permanent magnets in the holes have the same specifications. The two holes far from the central axis are empty slots, and the sharp corners of each hole are rounded;

[0075] Go to step S12;

[0076] S11.1: The center axis X is offset toward the boundary line Y by a distance g4 / 2 to obtain a line segment NV, which intersects L4 at point N and intersects L5 at point V;

[0077] S11.2: The central axis X is rotated about O1 in the direction of the boundary line Y by an angle a5 to obtain a straight line O1H, which intersects L4 at point H, where a5 = a4 / 2;

[0078] S11.3: Line O1H is offset to the left and right by a distance of g4 / 2, obtaining line segments JL and KM. JL and KM intersect L4 at points J and K, respectively. JL and KM intersect L5 at points L and M, respectively.

[0079] S11.4: A hole is formed by the straight line and arc through the four points KMVN, another hole is formed by the arc and straight line through the four points JLFG, and another hole is formed by the arc and straight line through the four points EDCB. The above three holes are mirrored about the central axis to form six holes, of which the four middle holes are used to insert permanent magnets. The permanent magnets in the holes have the same specifications. The two holes far from the central axis are empty slots, and the sharp corners of each hole are rounded;

[0080] S12: Replicate the hole structure under other residual poles through a circular array.

[0081] The rotor punching provided by the present invention is designed according to the following steps: according to symmetry, one pole of the motor rotor punching is designed as a sector, the expansion angle of the sector is 180 / p degrees, and p is the number of pole pairs; based on the central axis of the sector, the boundary straight line and the inner arc line of the motor stator, the boundary position of the hole is drawn by geometric drawing method, and some of the holes are used to insert permanent magnets, and the specifications of the permanent magnets in the holes are the same. The present invention can quickly design serialized high-speed permanent magnet rotor punchings, and the high-speed permanent magnet rotor punchings of the present invention can reduce the weight of the rotor, reduce the stress of the rotor reinforcement ribs, reduce the rotor no-load cogging torque and torque fluctuation under load, improve the level of standardization and serialization, and thus reduce the cost of the motor.

[0082] Optionally, arc L5 is offset by a distance h2 toward the center of the circle to obtain arc L6; the inner arc L8 of the rotor is offset by a distance h3 away from the center of the circle to obtain arc L7; a straight line L9 is drawn through point U, and the angle between L9 and the central axis X is a6, and a6 is 40 degrees to 50 degrees; the boundary straight line Y is offset by a distance h4 toward the center midline X to obtain a straight line L 10 The arcs L6, L7 and the straight lines L9, L 10 and the center axis X, the hole is mirrored about the center axis X to form a large hole, where the fillet r2 between L6 and L9, L 10 and L9, r3, L7 and L 10 The fillet r4 is chamfered between the two electrodes. The hole structure under the other residual poles is replicated by the circular array.

[0083] Optionally, in S1, the pole pair number p is one of the following: 2, 3, 4; the value range of the radius R1 is: 30 mm to 175 mm.

[0084] Optionally, in S2, the value range of a1 is: 0.88×180 / p degrees to 0.92×180 / p degrees; in S3, the value range of g2 is: g1 to 2×g1.

[0085] Optionally, in S5, the value range of g3 is: 0.5 mm to 2 mm.

[0086] Optionally, in S6, the value range of h1 is: 3×g1 to 4×g1.

[0087] Optionally, in S7, the value range of a2 is: 0.024×180 / p degree to 0.026×180 / p degree.

[0088] Optionally, in S8, the value range of a3 is: 0.64×180 / p degree to 0.80×180 / p degree; in S8, the value range of g4 is: 0.4 mm to 2 mm.

[0089] Optionally, in S12, the value range of h2 is: 0.2×R1 / p to 0.4×R1 / p, the value range of h3 is: 0.2×R1 / p to 0.5×R1 / p, the value range of h4 is: 0.07×R1 / p to 0.5×R1 / p, the value range of r2 is: 0.04×R1 / p to 0.4×R1 / p, the value range of r3 is: 0.04×R1 / p to 0.2×R1 / p, and the value range of r4 is: 0.04×R1 / p to 0.2×R1 / p.

[0090] Optionally, the cavity where the permanent magnet slot is located may be filled with insulating material to reduce the maximum stress of the rotor.

[0091] In summary, the permanent magnet synchronous motor made by using the punching sheets of the present invention has an eccentric arc outer circle of the rotor, which reduces the high-order harmonics contained in the air gap magnetic density wave, makes the air gap magnetic density waveform closer to sine, reduces the core loss of the stator teeth and yoke, and improves the efficiency of the motor. The permanent magnet synchronous motor made by the punching sheet of the present invention has only one permanent magnet specification, which reduces the number of permanent magnet specifications and reduces the manufacturing cost; the permanent magnet synchronous motor made by the punching sheet of the present invention has a rotor outer circle of an eccentric arc, which reduces the high-order harmonics contained in the air gap magnetic density wave, so the no-load cogging torque and the torque fluctuation under load are small; the permanent magnet slots of the punching sheet of the present invention are arc-shaped and close to the rotor outer circle, and the rotor core area outside the permanent magnet slot is very small, so that the stress on the rotor reinforcement ribs is small, which is convenient for increasing the maximum speed of the motor or expanding the outer diameter of the motor to increase the motor capacity; the rotor made by the punching sheet of the present invention has a larger lightening hole, which is convenient for reducing the weight of the rotor and reducing the rotor bearing load, which is beneficial to increasing the maximum speed of the motor or increasing the motor capacity; the punching sheet of the present invention can be used to design the rotor in segmented staggered poles to form the same effect as the stator skew slot, further reducing the no-load cogging torque and the torque fluctuation under load, and realizing higher-precision speed and position control.

[0092] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable ordinary technicians in the field to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-speed permanent magnet synchronous motor rotor punching, characterized in that: The rotor punching is designed according to the following steps: S1: According to symmetry, one pole of the motor rotor punching sheet is designed as a sector, the expansion angle of the sector is 180 / p degrees, p is the number of pole pairs, and the rotor structure under one pole is symmetrical about the central axis X of the sector, the left boundary straight line of the sector is Y, the part of the inner circle of the motor stator corresponding to the one pole is the arc L1, the center of the circle is the center of the motor shaft O, the radius of the arc L1 is R1, the arc L1 is offset toward the center of the circle by the air gap length g1 to obtain the outer circle boundary arc L2 of the motor rotor, the radius of L2 is R2, R2=R1-g1, and the intersection of the arc L2 and the central axis X is S; S2: Draw a pair of rays passing through the center O and symmetrical about the central axis X. The angle between the pair of rays is a1. The intersection point of one of the pair of rays between the central axis X and the boundary line Y and the arc L2 is P; S3: Given a point Q on OP, the length of the line segment PQ is g2; S4: draw an arc L3 through fixed points Q and S with its center on the central axis X. The center of the arc L3 is O1, the radius of the arc L3 is R3, and the contact point between the arc L3 and the boundary line Y is rounded by r1. The rounded arc L3 is the outer boundary of the rotor punching. S5: The arc L3 is offset toward the center by a distance g3 to obtain an arc L4, whose radius is R4, R4=R3-g3, and the arc L4 intersects the central axis X at point T; S6: The arc L4 is offset toward the center by a distance h1 to obtain the arc L5, whose radius is R5, R5 = R3-g3-h1, and the arc L5 intersects the central axis X at point U; S7: The boundary line Y is rotated by an angle a2 with O as the center toward the central axis X to obtain a line OB. The line OB intersects L4 and point B. A line BC is drawn through point B parallel to the boundary line Y. BC intersects L5 at point C. S8: The central axis X rotates around O in the direction of the boundary line Y by an angle of a3 / 2 to obtain the line OA, which intersects L4 at point A. The line O1A is offset left and right by a distance of g4 / 2 to obtain line segments DE and FG, which intersect L4 at points E and G respectively, and DE and FG intersect L5 at points D and F respectively. The angle between O1A and Y is set to a4; Go to S9.1 or S10.1 or S11.1; S9.1: The center axis X is offset toward the boundary line Y by a distance g4 / 2 to obtain a line segment JL, which intersects L4 at point J and intersects L5 at point L; S9.2: A hole is formed by the straight line and arc through the four points FGJL, and another hole is formed by the arc and straight line through the four points EDCB. The above two holes are mirrored about the central axis to form four holes, of which the two holes close to the central axis X are used to insert permanent magnets. The specifications of the permanent magnets in the holes are the same. The two holes far from the central axis are empty slots, and the sharp corners of each hole are rounded; Go to step S12; S10.1: The central axis X is rotated about O1 in the direction of the boundary line Y by an angle a5 to obtain a straight line O1H, which intersects L4 at point H, where a5 = a4 / 3; S10.2: Line O1H is offset to the left and right by a distance of g4 / 2 to obtain line segments JL and KM. JL and KM intersect L4 at points J and K, respectively. JL and KM intersect L5 at points L and M, respectively. S10.3: A hole is formed by the straight line and arc through the four points of TKMU, another hole is formed by the arc and straight line through the four points of JLFG, and another hole is formed by the arc and straight line through the four points of EDCB. The above three holes are mirrored about the central axis to form five holes, of which the three holes in the middle are used to insert permanent magnets. The permanent magnets in the holes have the same specifications. The two holes far from the central axis are empty slots, and the sharp corners of each hole are rounded; Go to step S12; S11.1: The center axis X is offset toward the boundary line Y by a distance g4 / 2 to obtain a line segment NV, which intersects L4 at point N and intersects L5 at point V; S11.2: The central axis X is rotated about O1 in the direction of the boundary line Y by an angle a5 to obtain a straight line O1H, which intersects L4 at point H, where a5 = a4 / 2; S11.3: Line O1H is offset to the left and right by a distance of g4 / 2, obtaining line segments JL and KM. JL and KM intersect L4 at points J and K, respectively. JL and KM intersect L5 at points L and M, respectively. S11.4: A hole is formed by the straight line and arc through the four points KMVN, another hole is formed by the arc and straight line through the four points JLFG, and another hole is formed by the arc and straight line through the four points EDCB. The above three holes are mirrored about the central axis to form six holes, of which the four middle holes are used to insert permanent magnets. The permanent magnets in the holes have the same specifications. The two holes far from the central axis are empty slots, and the sharp corners of each hole are rounded; S12: Replicate the hole structure under other residual poles through a circular array.

2. The high-speed permanent magnet synchronous motor rotor punching sheet according to claim 1, characterized in that: Arc L5 is offset by a distance h2 toward the center of the circle to obtain arc L6; the inner arc L8 of the rotor is offset by a distance h3 away from the center of the circle to obtain arc L7; a straight line L9 is drawn through point U, and the angle between L9 and the center axis X is a6, and a6 is 40 degrees to 50 degrees; the boundary straight line Y is offset by a distance h4 toward the center midline X to obtain a straight line L 10 The arcs L6, L7 and the straight lines L9, L 10 and the center axis X, the hole is mirrored about the center axis X to form a large hole, where the fillet r2 between L6 and L9, L 10 and L9, r3, L7 and L 10 The corners r4 are rounded off and the hole structures under other remaining poles are replicated through a circular array.

3. The high-speed permanent magnet synchronous motor rotor punching sheet according to claim 1, characterized in that: In S1, the pole pair number p is one of the following: 2, 3, 4; the radius R1 ranges from 30 mm to 175 mm.

4. The high-speed permanent magnet synchronous motor rotor punching sheet according to claim 1, characterized in that: In S2, the value range of a1 is: 0.88×180 / p degree to 0.92×180 / p degree; in S3, the value range of g2 is: g1 to 2×g1.

5. The high-speed permanent magnet synchronous motor rotor punching sheet according to claim 1, characterized in that: In S5, the value range of g3 is: 0.5mm to 2mm.

6. The high-speed permanent magnet synchronous motor rotor punching sheet according to claim 1, characterized in that: In S6, the value range of h1 is: 3×g1 to 4×g1.

7. The high-speed permanent magnet synchronous motor rotor punching sheet according to claim 1, characterized in that: In S7, the value range of a2 is: 0.024×180 / p degree to 0.026×180 / p degree.

8. The high-speed permanent magnet synchronous motor rotor punching sheet according to claim 1, characterized in that: In S8, the value range of a3 is: 0.64×180 / p degree to 0.80×180 / p degree; in S8, the value range of g4 is: 0.4mm to 2mm.

9. The high-speed permanent magnet synchronous motor rotor punching sheet according to claim 1, characterized in that: In S12, the value range of h2 is: 0.2×R1 / p to 0.4×R1 / p, the value range of h3 is: 0.2×R1 / p to 0.5×R1 / p, the value range of h4 is: 0.07×R1 / p to 0.5×R1 / p, the value range of r2 is: 0.04×R1 / p to 0.4×R1 / p, the value range of r3 is: 0.04×R1 / p to 0.2×R1 / p, and the value range of r4 is: 0.04×R1 / p to 0.2×R1 / p.

10. The high-speed permanent magnet synchronous motor rotor punching sheet according to claim 1, characterized in that: The cavity where the permanent magnet slot is located is filled with insulating material to reduce the maximum stress of the rotor.

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