A permanent magnet synchronous motor rotor

Abstract

A permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor includes rotor lamination, weight reduction hole, magnetic pole slot, ventilation hole, rivet hole, circular arc undercut, rotating shaft and magnetic bridge, the outer diameter of the rotor lamination adopts uneven air gap design, a plurality of magnetic pole slots are uniformly distributed around the rotor lamination, and magnetic bridge is formed between two adjacent magnetic pole slots, a plurality of weight reduction holes are arranged on the inner side of the magnetic pole slot of the rotor lamination, and a ventilation hole and a rivet hole are arranged between two adjacent weight reduction holes, the rotating shaft is arranged in the center of the rotor lamination, and a plurality of circular arc undercuts are uniformly arranged on the side surface of the rotating shaft.The uneven air gap design adopted in the application makes the air gap length change from large to small along the circumferential direction, and then change from small to large, forming a sinusoidal change rule, thereby optimizing the motor back electromotive force and air gap magnetic density waveform, weakening the harmonic content, and making the air gap length between the outer surface of the motor rotor and the inner surface of the stator uneven, and the air gap length at the center of the magnetic pole is minimum.

Description

TECHNICAL FIELD

[0001] The application relates to a technical improvement of a permanent magnet synchronous motor rotor and belongs to the field of permanent magnet synchronous motors. BACKGROUND

[0002] The permanent magnet synchronous motor is simple in structure, small in size, light in weight, small in loss and high in efficiency. Compared with the brushless direct current motor, the permanent magnet synchronous motor has no commutator and brush and the like. Compared with the asynchronous motor, the permanent magnet synchronous motor has high efficiency, high power factor, large torque inertia ratio, reduced stator current and stator resistance loss, and good control performance. Compared with the switched reluctance motor and the induction motor, the permanent magnet synchronous motor has high power density, high overload capacity and high efficiency, and has been widely applied to electric vehicle power drive systems. However, for the permanent magnet synchronous motor, the magnetic energy generated by the permanent magnet interacts with the stator tooth slot, generates a tooth slot effect, increases the harmonic content in the air gap, and reduces the control accuracy of the system. Therefore, reducing the high-order harmonic content, weakening the tooth slot torque, improving the torque output capacity and widening the constant power speed regulation range are important research contents of the electric vehicle permanent magnet synchronous motor.

[0003] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the general background of the patent application and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known in the field. SUMMARY

[0004] The application aims to overcome the problem of high high-order harmonic content in the prior art, and provides a permanent magnet synchronous motor rotor for reducing the high-order harmonic content.

[0005] To achieve the above object, the technical solution of the application is as follows: a permanent magnet synchronous motor rotor, comprising a rotor lamination, an optimization hole, a magnetic pole slot, a ventilation hole, a connecting hole, a circular arc notch, a rotating shaft and a magnetic isolation bridge.

[0006] A plurality of magnetic pole slots are formed in the rotor lamination, and the plurality of magnetic pole slots are evenly arranged on the periphery of the rotor lamination. The area between the adjacent two magnetic pole slots on the rotor lamination is the magnetic isolation bridge. A plurality of optimization holes are arranged on the inner side of the magnetic pole slot on the rotor lamination, and a ventilation hole and a connecting hole are arranged between the adjacent two optimization holes.

[0007] The rotating shaft is arranged at the center of the rotor lamination, and a plurality of circular arc notches are evenly arranged on the side surface of the rotating shaft.

[0008] The positions of the magnetic pole slots and the optimization holes correspond to each other, and the circular arc notches are located between the adjacent two magnetic pole slots.

[0009] The number of the optimization holes, the magnetic pole slots and the circular arc notches is the same, the number of the magnetic pole slots is eight, and the eight magnetic pole slots are evenly distributed around the rotor punching sheet.

[0010] The rotor punching sheet is a circle, and the division zones are arranged on the outer side of the magnetic pole slots.

[0011] The division zone comprises a line segment, a second line segment, a circular arc and a second circular arc, the right end of the line segment is connected with the left end of the second line segment, the right end of the second line segment is connected with the left end of the circular arc, the right end of the circular arc is connected with the left end of the second circular arc, and the right end of the second circular arc is connected with the left end of the line segment.

[0012] The second line segment and the circular arc form an included angle, and the circular arc and the second circular arc form two included angles.

[0013] The optimization hole comprises a left hole and a right hole, and the left hole and the right hole are mirror-symmetrical structures.

[0014] The right hole comprises a right first arc, the right side of the right first arc is connected with the left side of a right second arc, the right side of the right second arc is connected with the left side of a right third arc, the bottom of the right third arc is connected with the top of a right fourth arc, the bottom of the right fourth arc is connected with the top of a right fifth arc, the bottom of the right fifth arc is connected with the top of a right sixth arc, the bottom of the right sixth arc is connected with the top of a right seventh arc, and the left side of the right seventh arc is connected with the right side of a right eighth arc.

[0015] The right first arc and the right second arc form a right first angle, the right third arc and the right fourth arc form a right third angle, the right fourth arc and the right fifth arc form a right fourth angle, the right fifth arc and the right sixth arc form a right fifth angle, the right sixth arc and the right seventh arc form a right sixth angle, and the right seventh arc and the right eighth arc form a right seventh angle.

[0016] The line connecting the center of the right first arc with the rotation axis center point is the same as the line connecting the center of the magnetic pole slot with the rotation axis center.

[0017] An interval angle is arranged between two adjacent optimization holes.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1. In the permanent magnet synchronous motor rotor of the application, the outer diameter of the rotor lamination is designed with uneven air gap, multiple magnetic pole slots are uniformly distributed around the rotor lamination, and a magnetic isolation bridge is formed between the two adjacent magnetic pole slots; multiple optimization holes are arranged on the inner side of the magnetic pole slot of the rotor lamination, and a ventilation hole and a connecting hole are arranged between the two adjacent optimization holes; the uneven air gap design of the outer diameter of the rotor lamination makes the air gap length change from large to small along the circumferential direction, and then from small to large, forming a sinusoidal change rule, thereby optimizing the motor back electromotive force and air gap magnetic flux waveform, weakening the harmonic content, and making the air gap length between the outer surface of the motor rotor and the inner surface of the stator uneven, the air gap length at the center of the magnetic pole is the smallest, and the air gap length along the two sides of the magnetic pole increases continuously according to a certain rule. The outer surface of the traditional built-in radial permanent magnet synchronous motor rotor is a complete circle, at this time the motor has a uniform air gap, and the harmonic content of the air gap magnetic flux is relatively large. After the uneven air gap design, the high-order harmonic content can be reduced. Therefore, the application can effectively weaken the high-order harmonic content and optimize the magnetic field distribution.

[0020] 2. In the permanent magnet synchronous motor rotor of the application, the optimization hole includes a left hole and a right hole, the left hole and the right hole are mirror-symmetric structures, the right hole includes a right one arc, the right side of the right one arc is connected with the left side of a right two arc, the right side of the right two arc is connected with the left side of a right three arc, the bottom of the right three arc is connected with the top of a right four arc, the bottom of the right four arc is connected with the top of a right five arc, the bottom of the right five arc is connected with the top of a right six arc, the bottom of the right six arc is connected with the top of a right seven arc, and the left side of the right seven arc is connected with the right side of a right eight arc. This design is to optimize the distribution of magnetic flux density, improve the magnetic flux density near the magnetic pole slot 3, reduce the weight of the permanent magnet synchronous motor, increase the power density of the motor, affect the distribution of rotor magnetic flux density, increase the ventilation and heat dissipation area of the motor rotor, weaken the air gap magnetic flux density harmonic content of the optimization hole, and improve the performance of the motor. By optimizing the shape of the rotor core outer surface pole arc, the air gap magnetic flux density content is reduced, the torque fluctuation is suppressed, and the vibration and noise are reduced. The principle of weakening is to make the outer surface of the rotor as close to the sine wave shape as possible, so that the radial air gap magnetic flux density waveform of the motor approaches the sine wave, and the air gap magnetic flux density waveform is optimized. Therefore, the design reduces the air gap magnetic flux density content and suppresses the torque fluctuation. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the application.

[0022] Figure 2 is a structural schematic diagram of the rotor lamination in the application.

[0023] Figure 3 is a structural schematic diagram of the optimization hole in the application.

[0024] Figure 4 is a structural schematic diagram of the second control motor in the application.

[0025] Figure 5 is a schematic diagram of the magnetic pole distribution of the present application.

[0026] Figure 6 is a schematic diagram of the magnetic pole distribution of the first comparative motor in the present application.

[0027] Figure 7 is a schematic diagram of the structure of the first comparative motor in the present application.

[0028] Figure 8 is a comparative diagram of the radial air gap magnetic flux density waveform in the present application.

[0029] In the figure: rotor lamination 1, one line segment 11, two line segments 12, one circular arc 13, one included angle 131, two circular arcs 14, two included angles 141, optimization hole 2, left hole 20, right hole 201, right one arc 21, right two arc 22, right three arc 23, right four arc 24, right five arc 25, right six arc 26, right seven arc 27, right eight arc 28, right one angle 211, right three angle 231, right four angle 241, right five angle 251, right six angle 261, right seven angle 271, interval angle 29, magnetic pole slot 3, ventilation hole 4, connecting hole 5, circular arc lamination opening 6, rotating shaft 7, and magnetic bridge 8. DETAILED DESCRIPTION

[0030] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figures 1 to 8 A permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor comprising a rotor lamination 1, an optimization hole 2, a magnetic pole slot 3, a ventilation hole 4, a connecting hole 5, a circular arc lamination opening 6, a rotating shaft 7, and a magnetic bridge 8.

[0032] A plurality of magnetic pole slots 3 are provided on the rotor lamination 1, and the plurality of magnetic pole slots 3 are evenly arranged on the periphery of the rotor lamination 1. The area between the adjacent two magnetic pole slots 3 on the rotor lamination 1 is the magnetic bridge 8. A plurality of optimization holes 2 are arranged on the inner side of the magnetic pole slot 3 on the rotor lamination 1, and a ventilation hole 4 and a connecting hole 5 are arranged between the adjacent two optimization holes 2.

[0033] The rotating shaft 7 is arranged in the center of the rotor lamination 1, and a plurality of circular arc lamination openings 6 are evenly arranged around the side surface of the rotating shaft 7.

[0034] The positions of the magnetic pole slot 3 and the optimization hole 2 correspond, and the circular arc lamination opening 6 is located between the adjacent two magnetic pole slots 3.

[0035] The number of the optimization hole 2, the magnetic pole slot 3, and the circular arc lamination opening 6 is the same, the number of the magnetic pole slot 3 is eight, and the eight magnetic pole slots 3 are evenly distributed around the rotor lamination 1.

[0036] The rotor lamination 1 is a circle, and a split area 9 is arranged outside the magnetic pole slot 3 on the rotor lamination 1, and the split area 9 corresponds to the position of the magnetic pole slot 3 one by one.

[0037] The split area 9 includes a line segment 11, a second line segment 12, an arc 13, and a second arc 14, the right end of the line segment 11 is connected with the left end of the second line segment 12, the right end of the second line segment 12 is connected with the left end of the arc 13, the right end of the arc 13 is connected with the left end of the second arc 14, and the right end of the second arc 14 is connected with the left end of the line segment 11.

[0038] The second line segment 12 and the arc 13 form an included angle 131, and the arc 13 and the second arc 14 form two included angles 141.

[0039] The optimization hole 2 includes a left hole 20 and a right hole 201, and the left hole 20 and the right hole 201 are mirror-symmetric structures.

[0040] The right hole 201 includes a right first arc 21, the right side of the right first arc 21 is connected with the left side of a right second arc 22, the right side of the right second arc 22 is connected with the left side of a right third arc 23, the bottom of the right third arc 23 is connected with the top of a right fourth arc 24, the bottom of the right fourth arc 24 is connected with the top of a right fifth arc 25, the bottom of the right fifth arc 25 is connected with the top of a right sixth arc 26, the bottom of the right sixth arc 26 is connected with the top of a right seventh arc 27, and the left side of the right seventh arc 27 is connected with the right side of a right eighth arc 28.

[0041] The right first arc 21 and the right second arc 22 form a right first angle 211, the right third arc 23 and the right fourth arc 24 form a right third angle 231, the right fourth arc 24 and the right fifth arc 25 form a right fourth angle 241, the right fifth arc 25 and the right sixth arc 26 form a right fifth angle 251, the right sixth arc 26 and the right seventh arc 27 form a right sixth angle 261, and the right seventh arc 27 and the right eighth arc 28 form a right seventh angle 271.

[0042] The center line of the right first arc 21 and the center line of the magnetic pole slot 3 are the same.

[0043] An interval angle 29 is arranged between two adjacent optimization holes 2.

[0044] Embodiment 1:

[0045] A permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor includes a rotor lamination 1, an optimization hole 2, a magnetic pole slot 3, a ventilation hole 4, a connecting hole 5, a circular arc lamination 6, a rotating shaft 7, and a magnetic isolation bridge 8.

[0046] The rotor lamination 1 is provided with a plurality of magnetic pole slots 3, the plurality of magnetic pole slots 3 are evenly arranged on the periphery of the rotor lamination 1, and the area between the adjacent two magnetic pole slots 3 on the rotor lamination 1 is a magnetic isolation bridge 8; a plurality of optimization holes 2 are arranged on the inner side of the magnetic pole slot 3 on the rotor lamination 1, and a ventilation hole 4 and a connecting hole 5 are arranged between the adjacent two optimization holes 2;

[0047] The rotor lamination 1 is provided with a plurality of magnetic pole slots 3, the plurality of magnetic pole slots 3 are evenly arranged on the periphery of the rotor lamination 1, and the area between the adjacent two magnetic pole slots 3 on the rotor lamination 1 is a magnetic isolation bridge 8; a plurality of optimization holes 2 are arranged on the inner side of the magnetic pole slot 3 on the rotor lamination 1, and a ventilation hole 4 and a connecting hole 5 are arranged between the adjacent two optimization holes 2, the outer diameter of the rotor lamination 1 is designed with uneven air gap, so that the air gap length changes from large to small, and then from small to large along the circumferential direction, forming a sinusoidal change rule, thereby optimizing the motor back electromotive force and air gap magnetic density waveform, and weakening the harmonic content, that is, the air gap length between the outer surface of the motor rotor and the inner surface of the stator is uneven, the air gap length at the center of the magnetic pole is the smallest, and the air gap length along the two sides of the magnetic pole increases continuously according to a certain rule, the outer surface of the traditional built-in radial type permanent magnet synchronous motor rotor is a complete circle, at this time the motor has a uniform air gap, and the harmonic content of the air gap magnetic density is large, and after the uneven air gap design, the harmonic content of the air gap magnetic density can be effectively weakened.

[0048] The magnetic pole slot 3 corresponds to the position of the optimization hole 2, and the circular arc notch 6 is located between the adjacent two magnetic pole slots 3.

[0049] Embodiment 2:

[0050] Embodiment 2 is basically the same as embodiment 1, and the difference is that:

[0051] A permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor comprises a rotor lamination 1, an optimization hole 2, a magnetic pole slot 3, a ventilation hole 4, a connecting hole 5, a circular arc notch 6, a rotating shaft 7 and a magnetic isolation bridge 8;

[0052] The rotor lamination 1 is provided with a plurality of magnetic pole slots 3, the plurality of magnetic pole slots 3 are evenly arranged on the periphery of the rotor lamination 1, and the area between the adjacent two magnetic pole slots 3 on the rotor lamination 1 is a magnetic isolation bridge 8; a plurality of optimization holes 2 are arranged on the inner side of the magnetic pole slot 3 on the rotor lamination 1, and a ventilation hole 4 and a connecting hole 5 are arranged between the adjacent two optimization holes 2, the outer diameter of the rotor lamination 1 is designed with uneven air gap, so that the air gap length changes from large to small, and then from small to large along the circumferential direction, forming a sinusoidal change rule, thereby optimizing the motor back electromotive force and air gap magnetic density waveform, and weakening the harmonic content, that is, the air gap length between the outer surface of the motor rotor and the inner surface of the stator is uneven, the air gap length at the center of the magnetic pole is the smallest, and the air gap length along the two sides of the magnetic pole increases continuously according to a certain rule, the outer surface of the traditional built-in radial type permanent magnet synchronous motor rotor is a complete circle, at this time the motor has a uniform air gap, and the harmonic content of the air gap magnetic density is large, and after the uneven air gap design, the harmonic content of the air gap magnetic density can be effectively weakened.

[0053] Wherein the motor back electromotive force is as follows:

[0054] The no-load back electromotive force is the electromotive force induced in the coil by the magnetic field rotation generated by the rotation of the rotor and the permanent magnet when the permanent magnet synchronous motor is at no load, and the expression of the stator induction electromotive force E is:

[0055]

[0056] Excessive harmonic content in the no-load back electromotive force will cause torque fluctuations and harmonic currents in the motor during operation, which will increase the copper loss of the motor, reduce the motor control accuracy, increase the temperature, and reduce the efficiency, ultimately causing the motor's operating performance to deteriorate.

[0057] The air gap magnetic flux waveform is described as follows:

[0058] The air gap is a crucial area for electromechanical energy conversion in motors. The permanent magnets within the motor rotor generate magnetic flux, which decomposes into radial and tangential flux. Only the radial flux enters the stator and interlinks with the stator armature windings. Therefore, the effective radial flux in the air gap determines the motor's fundamental performance. Excessive harmonic content in the air gap flux density generates harmonic eddy currents, increasing motor losses, increasing torque fluctuations, and generating vibration and noise, leading to lower motor efficiency and reduced operational stability. The flux density curve shows the distribution and variation of the flux density in the motor's air gap.

[0059] The radial air gap magnetic flux density expression is:

[0060]

[0061] in and are the x-axis and y-axis components of the magnetic flux density, is the corresponding angle in cylindrical coordinates.

[0062] Compare Figure 4 The radial air gap flux density waveforms of the second control motor and the motor of the present invention are as follows: Figure 8 As shown in the figure, Br is the value of the radial air gap flux density, T is its unit Tesla, the control motor is Reference, the motor of the present invention is Experimental, and distance is the length of the arc drawn at the air gap; by comparing the air gap flux density waveforms of different rotor structures, it can be found that the air gap flux density waveform of the motor of the present invention is closer to a sine wave, and the harmonic content is reduced.

[0063] Example 3:

[0064] Example 3 is basically the same as Example 2, except that:

[0065] A permanent magnet synchronous motor rotor, wherein a plurality of magnetic pole slots 3 are evenly distributed around the rotor punching 1, and a magnetic isolation bridge 8 is formed between two adjacent magnetic pole slots 3. The principle of the magnetic isolation bridge 8 is to limit the leakage flux by saturating the magnetic flux at the magnetic bridge part. The magnetic isolation bridge 8 is thinner than the common built-in radial permanent magnet synchronous motor. This design is similar to the IPM structure to achieve and The angle is small, which is convenient for control and eliminates eddy current loss; a plurality of optimization holes 2 are arranged on the inner side of the magnetic pole slot 3 of the rotor lamination 1, a ventilation hole 4 and a connecting hole 5 are arranged between two adjacent optimization holes 2, and the connecting hole 5 is arranged to stack and fix the entire rotor lamination 1;

[0066] A rotating shaft 7 is arranged at the center of the rotor lamination 1, and a plurality of circular arc notches 6 are uniformly arranged on the side surface of the rotating shaft 7, the circular arc notches 6 are used for lightweight design of the rotor, and the lightweight structure basically does not change the output performance of the motor, and the iron core area of the rotor is removed according to the magnetic density distribution under the entire operation cycle;

[0067] The magnetic pole slot 3 corresponds to the position of the optimization hole 2, and the circular arc notch 6 is located between two adjacent magnetic pole slots 3.

[0068] Embodiment 4:

[0069] Embodiment 4 is basically the same as embodiment 3, and the difference is that:

[0070] A permanent magnet synchronous motor rotor, the number of optimization holes 2, magnetic pole slots 3 and circular arc notches 6 is the same, the number of magnetic pole slots 3 is eight, and the eight magnetic pole slots 3 are uniformly distributed on the rotor lamination 1, and the annular matrix distribution is used to improve the symmetry, simplify the structure, ensure the uniform distribution of the optimization hole 2, and reduce the mass of the motor.

[0071] The rotor lamination 1 is a circular shape, and a split zone 9 is arranged on the outer side of the magnetic pole slot 3 of the rotor lamination 1.

[0072] The split zone 9 includes a line segment 11, a second line segment 12, an arc 13 and a second arc 14, the right end of the line segment 11 is connected with the left end of the second line segment 12, the right end of the second line segment 12 is connected with the left end of the arc 13, the right end of the arc 13 is connected with the left end of the second arc 14, and the right end of the second arc 14 is connected with the left end of the line segment 11.

[0073] The second line segment 12 and the arc 13 form an included angle 131, the angle of the included angle 131 is 4°, the arc 13 and the second arc 14 form a second included angle 141, the angle of the second included angle 141 is 21°, and the curvature radius ratio of the first included angle 131 and the second included angle 141 is 0.6069:1, wherein the center of the arc 13 deviates from the center of the second arc 14, and the center of the second arc 14 also has a certain distance from the center of the rotating shaft 7, so that the magnetic density changes more gently, the output torque of the motor is not greatly affected, and the value of the output torque is ensured.

[0074] Embodiment 5:

[0075] Example 5 is substantially the same as example 4, except that:

[0076] A permanent magnet synchronous motor rotor, the optimization hole 2 includes left hole 20 and right hole 201, left hole 20 and right hole 201 are mirror image symmetry structure, optimization hole 2 is along the center line of magnetic pole slot 3 and the center of the axis of rotation 7 symmetry distribution after the common formation of closed curve, optimization hole 2 is designed to optimize the distribution of magnetic flux density, improve the magnetic flux density near the magnetic pole slot 3, also can reduce the weight of permanent magnet synchronous motor, increase the power density of motor, affect the distribution of rotor magnetic flux density, increase the ventilation area of motor rotor.

[0077] Optimization hole 2 weakens the air gap magnetic flux density harmonic content, improves the motor performance, is through optimizing the rotor core outer surface pole arc shape, thereby achieving the purpose of reducing the air gap magnetic flux density content, inhibiting torque fluctuation, reducing vibration and noise, the principle of weakening is to make the outer surface of the rotor as close to the sine wave shape as possible, so that the radial air gap magnetic flux density waveform of the motor is close to the sine wave, and the air gap magnetic flux density waveform is optimized.

[0078] The magnetic pole distribution of the application is as shown in Figure 5 The magnetic pole distribution of the first control motor is as shown in Figure 6

[0079] As shown in Figure 7 In the first control motor, the optimization hole is circular, and the area of the optimization hole is consistent with that of the experimental motor. By comparing the magnetic flux density values of the circular punching and the three points M1, M2 and M3 of the punching of the application, it can be seen that the optimization hole 2 of the motor of the application is beneficial to improve the magnetic flux density near the magnetic pole slot.

[0080] .

[0081] The right hole 201 includes a right one-arc 21, the right side of the right one-arc 21 is connected with the left side of a right two-arc 22, the right side of the right two-arc 22 is connected with the left side of a right three-arc 23, the bottom of the right three-arc 23 is connected with the top of a right four-arc 24, the bottom of the right four-arc 24 is connected with the top of a right five-arc 25, the bottom of the right five-arc 25 is connected with the top of a right six-arc 26, the bottom of the right six-arc 26 is connected with the top of a right seven-arc 27, and the left side of the right seven-arc 27 is connected with the right side of a right eight-arc 28.

[0082] ​A right angle 211 is formed between the right first arc 21 and the right second arc 22, and the angle of the right angle 211 is 27°. A right triangle 231 is formed between the right third arc 23 and the right fourth arc 24, and the angle of the right triangle 231 is 123°. A right four-corner 241 is formed between the right fourth arc 24 and the right fifth arc 25, and the angle of the right four-corner 241 is 46°. A right five-corner 251 is formed between the right fifth arc 25 and the right sixth arc 26, and the angle of the right five-corner 251 is 52°. A right six-corner 261 is formed between the right sixth arc 26 and the right seventh arc 27, and the angle of the right six-corner 261 is 21°. A right seven-corner 271 is formed between the right seventh arc 27 and the right eighth arc 28, and the angle of the right seven-corner 271 is 50°.

[0083] The line connecting the center of the right arc 21 and the center of the rotating shaft 7 is the same as the line connecting the center of the magnetic pole slot 3 and the center of the rotating shaft 7 .

[0084] An interval angle 29 is provided between two adjacent optimized holes 2, and the interval angle is 45°.

[0085] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. A permanent magnet synchronous motor rotor, characterized in that The permanent magnet synchronous motor rotor comprises a rotor punching (1), an optimization hole (2), a magnetic pole slot (3), a ventilation hole (4), a connection hole (5), an arc punching (6), a rotating shaft (7) and a magnetic isolation bridge (8); The rotor punching (1) is provided with a plurality of magnetic pole slots (3), the plurality of magnetic pole slots (3) being evenly arranged around the periphery of the rotor punching (1), and the region between two adjacent magnetic pole slots (3) on the rotor punching (1) being a magnetic isolation bridge (8); the rotor punching (1) is provided with a plurality of optimized holes (2) on the inner sides of the magnetic pole slots (3), and a ventilation hole (4) and a connection hole (5) are provided between two adjacent optimized holes (2); A rotating shaft (7) is provided in the center of the rotor punching sheet (1), and a plurality of arc punching notches (6) are evenly provided around the side of the rotating shaft (7); The magnetic pole slots (3) correspond to the positions of the optimized holes (2), and the circular arc punching (6) is located between two adjacent magnetic pole slots (3); The number of the optimized holes (2), magnetic pole slots (3) and circular arc punchings (6) is the same, the number of the magnetic pole slots (3) is eight, and the eight magnetic pole slots (3) are evenly distributed around the rotor punching sheet (1); The rotor punching sheet (1) is quasi-circular, and a partitioning area (9) is provided on the rotor punching sheet (1) outside the magnetic pole slot (3), and the position of the partitioning area (9) corresponds to the position of the magnetic pole slot (3) one by one; The optimized hole (2) comprises a left hole (20) and a right hole (201), and the left hole (20) and the right hole (201) are mirror-symmetrical structures; The right hole (201) includes a right first arc (21), the right side of the right first arc (21) is connected to the left side of the right second arc (22), the right side of the right second arc (22) is connected to the left side of the right third arc (23), the bottom of the right third arc (23) is connected to the top of the right fourth arc (24), the bottom of the right fourth arc (24) is connected to the top of the right fifth arc (25), the bottom of the right fifth arc (25) is connected to the top of the right sixth arc (26), the bottom of the right sixth arc (26) is connected to the top of the right seventh arc (27), and the left side of the right seventh arc (27) is connected to the right side of the right eighth arc (28); A right first angle (211) is formed between the right first arc (21) and the right second arc (22), a right triangle (231) is formed between the right third arc (23) and the right fourth arc (24), a right fourth angle (241) is formed between the right fourth arc (24) and the right fifth arc (25), a right fifth angle (251) is formed between the right fifth arc (25) and the right sixth arc (26), a right hexagon (261) is formed between the right sixth arc (26) and the right seventh arc (27), and a right hexagon (271) is formed between the right seventh arc (27) and the right eighth arc (28); The right first arc (21) and the right second arc (22) form a right first angle (211), and the angle of the right first angle (211) is 27°. The right third arc (23) and the right fourth arc (24) form a right triangle (231), and the angle of the right triangle (231) is 123°. The right fourth arc (24) and the right fifth arc (25) form a right fourth angle (241), and the angle of the right fourth angle (241) is 46°. The right fifth arc (25) and the right sixth arc (26) form a right fifth angle (251), and the angle of the right fifth angle (251) is 52°. The right sixth arc (26) and the right seventh arc (27) form a right hexagon (261), and the angle of the right hexagon (261) is 21°. The right seventh arc (27) and the right eighth arc (28) form a right hexagon (271), and the angle of the right hexagon (271) is 50°. The outer diameter of the rotor punching (1) adopts an uneven air gap design, so that the air gap length changes from large to small and then from small to large along the circumferential direction, forming a sinusoidal change law. The air gap length is the smallest at the center of the magnetic pole, and the air gap length along both sides of the magnetic pole increases continuously according to a certain law. This optimizes the motor's back electromotive force and air gap flux waveform and reduces harmonic content.

2. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: The segmentation area (9) includes a line segment (11), two line segments (12), an arc (13) and two arcs (14), wherein the right end of the line segment (11) is connected to the left end of the two line segments (12), the right end of the two line segments (12) is connected to the left end of the arc (13), the right end of the arc (13) is connected to the left end of the two arcs (14), and the right end of the two arcs (14) is connected to the left end of the line segment (11).

3. The permanent magnet synchronous motor rotor according to claim 2, characterized in that: The two line segments (12) and an arc (13) form an included angle (131), and the arc (13) and the two arcs (14) form two included angles (141).

4. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: The line connecting the center of the right arc (21) and the center of the rotating shaft (7) is the same as the line connecting the center of the magnetic pole slot (3) and the center of the rotating shaft (7).

5. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: An interval angle (29) is provided between two adjacent optimized holes (2).

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