Permanent magnet motor rotor structure capable of preventing magnetic leakage and adjusting dynamic balance

Abstract

The utility model relates to the technical field of permanent magnet motor rotors, in particular to a permanent magnet motor rotor structure capable of preventing flux leakage and adjusting dynamic balance, which comprises a rotating shaft and a rotor core fixed on the rotating shaft in a penetrating manner, a plurality of punching sheets are fixed on the rotor core, a plurality of groups of V-shaped holes are uniformly distributed in the punching sheets along the circumference, permanent magnets are arranged in the V-shaped holes, and the included angles of the V-shaped holes face the peripheries of the punching sheets; the two ends of the punching sheet are fixedly provided with rotor end plates made of a non-magnetic-conductive material, the rotor end plates are provided with mounting holes, the mounting holes and the V-shaped holes are the same in shape and position, and the mounting holes are internally and fixedly provided with stop blocks made of a non-magnetic-conductive material; the rotor end plate is also detachably connected with a trapezoidal plate made of a non-magnetic material, and the trapezoidal plate covers the mounting hole. According to the utility model, the end magnetic isolation and dynamic balance adjustment technologies are integrated, the magnetic flux density distribution can be optimized, and the magnetic resistance change is reduced; and meanwhile, the dynamic balance adjustment convenience in the manufacturing process is improved, and the motor performance is optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of permanent magnet motor rotor, specifically to a permanent magnet motor rotor structure of leaky magnetic field prevention and dynamic balance adjustment. BACKGROUND

[0002] Permanent magnet motor is a kind of motor using permanent magnet to provide magnetic field, according to the arrangement of permanent magnet, it can be divided into surface-mounted and built-in type, surface-mounted permanent magnet motor refers to the permanent magnet fixed on the outer surface of rotor iron core, and the permanent magnet of built-in type permanent magnet motor is embedded in the inside of rotor iron core, in working, permanent magnet produces constant magnetic field on rotor, stator winding produces rotating magnetic field after electrification, rotating magnetic field and the constant magnetic field of permanent magnet produce interaction, push rotor to rotate, thereby producing mechanical energy that can drive load.

[0003] Among them, built-in permanent magnet motor because permanent magnet is located in the inside of rotor iron core, permanent magnet can be protected by iron core, can better resist centrifugal force of rotor when rotating, permanent magnet is not easy to fall off, thus is particularly suitable for high-speed, high-power application scenarios.

[0004] And the magnetic field distribution of permanent magnet can cause the influence of the operation and vibration of motor, thus the installation angle of permanent magnet needs to be considered, such as prior art "rotor and permanent magnet synchronous motor" (publication number: CN108233574A), permanent magnet is arranged in the installation slot of rotor according to certain angle, so that the magnetic flux distribution is more uniform, to reduce the vibration of motor, reduce the function of noise;But, this motor places all permanent magnets connected head to tail in the rotor, so that the heat in the inside of rotor cannot be discharged quickly, the temperature of rotor is too high, can cause the increase of motor heating, reduce the operating efficiency of motor;In order to solve the above problem, prior art "the rotor of self-starting permanent magnet synchronous motor" (publication number: CN110829658A) increases a ventilation groove plate every interval axial distance in the rotor, so that heat can be discharged from the ventilation groove in the ventilation groove plate, thereby enhancing heat dissipation. The above two prior arts have certain optimization to the magnetic flux distribution and heat dissipation problem of permanent magnet motor, but due to the structure of permanent magnet motor is not optimized, the vibration of rotor and magnetic isolation problem cannot be solved in design, which is not conducive to the manufacture and assembly in actual production. Therefore, the utility model person proposes a structure of permanent magnet motor to solve the difficulty of the above prior art, to optimize the performance of permanent magnet motor. UTILITY MODEL CONTENTS

[0005] The utility model provides a permanent magnet motor rotor structure of leaky magnetic field prevention and dynamic balance adjustment can solve the technical problem of permanent magnet motor in prior art cannot solve the dynamic balance adjustment of motor and prevent the magnetic field of technology.

[0006] The application provides the following technical scheme: a rotor structure of a permanent magnet motor capable of preventing magnetic leakage and dynamic balance adjustment, comprising a rotating shaft and a rotor core fixed on the rotating shaft;

[0007] A plurality of punching sheets are fixed on the rotor core, a plurality of groups of V-shaped holes are uniformly distributed on the punching sheets in a circumferential direction, permanent magnets are arranged in the V-shaped holes, and the included angle of the V-shaped holes faces the outer periphery of the punching sheets; non-magnetic material is used to form rotor end plates fixed at both ends of the punching sheets, mounting holes are formed in the rotor end plates, the mounting holes have the same shape and position as the V-shaped holes, non-magnetic material is used to form stop blocks fixed in the mounting holes; and the rotor end plates are detachably connected to trapezoidal plates made of non-magnetic material, and the trapezoidal plates cover the mounting holes.

[0008] Beneficial effects:

[0009] The end magnetic isolation and dynamic balance adjustment technologies are integrated, and the motor performance is optimized. Since the permanent magnets of the built-in permanent magnet motor need to be arranged in the punching sheets after the punching sheets are laminated, the mounting holes are formed in the rotor end plates, the permanent magnets are axially arranged in the punching sheets from the mounting holes in the rotor end plates after the punching sheets are laminated, the stop blocks are filled in the mounting holes to axially limit the permanent magnets, the stop blocks are made of non-magnetic material, the magnetic flux of the permanent magnets can be prevented from leaking from the rotor end plates, and the effect of preventing magnetic leakage is achieved; the trapezoidal plates are further used to block the mounting holes, the axial limitation of the permanent magnets is further strengthened, the material of the trapezoidal plates is selected to be non-magnetic material, the magnetic isolation effect is further strengthened, the magnetic flux density distribution is optimized, and the magnetic resistance change is reduced; and the trapezoidal blocks can be replaced, the rotor dynamic balance adjustment is achieved by replacing trapezoidal blocks with different weights to adjust the rotor rotation stability, the integration of the magnetic isolation and dynamic balance technologies is achieved, and the performance of the permanent magnet motor is optimized.

[0010] Further, a plurality of screw holes are uniformly distributed on the inner periphery of the rotor end plates, and counterweight blocks can be fixed in the screw holes.

[0011] Beneficial effects: the counterweight blocks can be added or removed in the screw holes in the corresponding positions to achieve the dynamic balance adjustment of the rotor, and the dynamic balance adjustment is more convenient in cooperation with the trapezoidal blocks on the rotor end plates.

[0012] Further, a positioning pin is arranged at one end of the permanent magnet, the positioning pin separates the adjacent permanent magnets in the axial direction, and the material of the positioning pin is non-magnetic material.

[0013] Beneficial effects: the positioning pin is used for limiting the adjacent permanent magnets in the axial direction, preventing the permanent magnets from loosening during high-speed rotation of the rotor, and improving the stability, the permanent magnets are separated into sections along the axial direction by the positioning pin, the eddy current resistance can be improved, and the eddy current loss is reduced.

[0014] Furthermore, the included angle between the V-shaped hole and the mounting hole is 130°–160°.

[0015] Beneficial effects: By limiting the included angle between the V-shaped hole and the mounting hole, the permanent magnets are arranged at a certain angle, which can optimize the magnetic flux distribution between the permanent magnets, reduce mutual interference of magnetic flux, make the magnetic flux more concentrated, and reduce magnetic leakage, thereby improving the output power and efficiency of the motor.

[0016] Furthermore, the permanent magnets within the V-shaped hole are arranged in segments.

[0017] Beneficial effects: Segmenting the permanent magnet can improve the internal resistance of eddy currents and reduce eddy current losses. Attached Figure Description

[0018] Figure 1 This is the main structural view of the present invention.

[0019] Figure 2 For this Figure 1 The left view.

[0020] Figure 3 for Figure 1 Sectional view of AA. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method:

[0022] The markings in the accompanying drawings include: 1. Rotor shaft; 2. Rotor core; 3. Rotor end plate; 4. Stop block; 41. Disassembly hole; 5. Trapezoidal plate; 6. Lamination; 7. Ventilation slot plate; 8. Permanent magnet; 9. Positioning pin; 10. Screw hole; 11. V-hole; 12. Air hole; 13. Mounting hole.

[0023] Example 1

[0024] like Figures 1 to 3 As shown, a permanent magnet motor rotor structure that can prevent magnetic leakage and adjust dynamic balance includes a rotating shaft, a rotor core fixed on the rotating shaft, and multiple laminations 6 sleeved on the outer periphery of the core.

[0025] Multiple laminations 6 are axially stacked to form a whole. Multiple sets of V-shaped holes 11 are evenly distributed along the circumference of each lamination 6. The included angle of the V-shaped holes 11 is 130°–160°, preferably 150° in this embodiment. Permanent magnets 8 are installed within each V-shaped hole 11, arranged in segments. In this embodiment, each hole in each set of V-shaped holes 11 contains two permanent magnets 8. Air holes 12 are reserved at the ends of the V-shaped holes 11 near the outer periphery of the lamination 6. The function of the air holes 12 is to isolate the magnetic flux of the permanent magnets 8 from passing through the air gap, preventing magnetic leakage and additional magnetic resistance, thereby reducing magnetic loss. Ventilation slots 7 are provided between a certain number of laminations 6. The ventilation slots 7 also have V-shaped holes 11, with the same shape and position as the V-shaped holes 11 on the laminations 6. Multiple channel steels are evenly distributed along the circumference of the ventilation slots 7, allowing heat from inside the rotor to dissipate through the holes in the channel steels.

[0026] In the axial direction, a positioning pin 9 is provided at one end of the permanent magnet 8. The positioning pin 9 is made of stainless steel. Figure 1 As shown, the left end of the positioning pin 9 is inserted into the pin hole on the right end face of the permanent magnet 8 by means of a pin shaft connection, and the connecting surface between the pin hole and the positioning pin 9 is coated with a high-temperature resistant adhesive. Then, they are sequentially embedded into the V-shaped holes 11 inside the lamination 6. When embedding, the contact surface between the permanent magnet 8 and the V-shaped hole 11 needs to be filled with a high-temperature resistant adhesive. The axial length of the permanent magnet 8 is the same as the stacking length of the laminations 6 between each ventilation slot plate 7.

[0027] Both ends of the lamination 6 are provided with rotor end plates 3, which are made of stainless steel. The lamination 6 is tightened by the rotor end plates 3 through axially penetrating screws and nuts, so that the rotor end plates 3 press the lamination 6 tightly. The rotor end plates 3 are provided with mounting holes 13, which have the same shape and position as the V-shaped holes 11. A stop block 4 is fixed in the mounting hole 13. The stop block 4 is made of stainless steel, and the contact surface between the stop block 4 and the mounting hole 13 is filled with high-temperature resistant adhesive. The side of the stop block 4 facing away from the permanent magnet 8 is provided with a disassembly hole 41, which is a threaded hole. The mounting hole 13 is covered with a trapezoidal plate 5, which is made of aluminum alloy. The trapezoidal plate 5 is fixed to the rotor end plate 3 by three screws, and the screws of the trapezoidal plate are arranged in a triangle on both sides of the stop block 4. After removing the trapezoidal plate 5, it can be screwed into the disassembly hole 41 to remove the stop block 4.

[0028] Multiple screw holes 10 are evenly distributed on the inner circumference of the rotor end plate 3. Counterweights can be fixed in the screw holes 10. When performing dynamic balance adjustment, counterweights can be added or removed in the corresponding screw holes 10 to achieve dynamic balance adjustment of the rotor.

[0029] The working principle of this utility model is as follows:

[0030] The magnetic field of the permanent magnet 8 close to the rotor end plate 3 is easy to leak from the axial direction, the rotor end plate 3 of the scheme adopts stainless steel material to isolate the magnetism, meanwhile, since the permanent magnet 8 of the built-in permanent magnet motor needs to be installed in the punching sheet 6 after the punching sheet 6 is laminated, the scheme sets the mounting hole 13 on the rotor end plate 3, the permanent magnet 8 can be installed in the punching sheet 6 from the mounting hole 13 in the axial direction without disassembling the rotor end plate 3, the stop block 4 plays the role of plugging, and the axial position of the permanent magnet 8 is limited, and the stop block 4 adopts stainless steel material to realize the effect of preventing magnetic leakage, and then the trapezoidal plate 5 is plugged on the mounting hole 13, the axial position of the permanent magnet 8 is further strengthened, and the material of the trapezoidal plate 5 is selected to be stainless steel material, the effect of isolating the magnetism is further strengthened, the magnetic flux density distribution is optimized, and the magnetic resistance change is reduced.

[0031] The trapezoidal block can be replaced, when the rotor is dynamically balanced, the trapezoidal block of different weights is replaced to adjust the stability of the rotor, the screw hole 10 for installing the counterweight block on the inner circumference of the rotor end plate 3 is matched, the dynamic balance adjustment is more convenient, the rotor realizes the integration of the magnetic isolation and the dynamic balance technology, and the performance of the permanent magnet motor is optimized.

[0032] The above is only an embodiment of the utility model, the utility model is not limited to the field involved in the embodiment, and the specific structure and the common knowledge of the characteristics in the scheme are not described too much. It should be pointed out that for those skilled in the art, without departing from the structure of the utility model, a number of deformations and improvements can be made, which should also be regarded as the protection range of the utility model, and these will not affect the effect and the practicability of the utility model. The protection range of the application should be subject to the content of the claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A magnetic leakage-proof and dynamic balance-adjustable permanent magnet motor rotor structure, comprising a rotating shaft and a rotor core fixed on the rotating shaft; characterized in that: a plurality of punching sheets are fixed on the rotor core, a plurality of groups of V-shaped holes are uniformly distributed on the punching sheets in a circumferential direction, permanent magnets are arranged in the V-shaped holes, and the included angle of the V-shaped holes faces the outer periphery of the punching sheets; non-magnetic material-made rotor end plates are fixed at both ends of the punching sheets, mounting holes are formed on the rotor end plates, the mounting holes are identical in shape and position to the V-shaped holes, non-magnetic material-made stop blocks are fixed in the mounting holes, and trapezoidal plates made of non-magnetic material are detachably connected to the rotor end plates and cover the mounting holes. A plurality of screw holes are uniformly distributed on the inner periphery of the rotor end plates, and counterweight blocks can be fixed in the screw holes.

2. The magnetic leakage-proof and dynamic balance adjustable permanent magnet motor rotor structure according to claim 1, characterized in that: One end of the permanent magnet is provided with a positioning pin, the positioning pin separates adjacent permanent magnets in an axial direction, and the material of the positioning pin is non-magnetic material.

3. The magnetic leakage-proof and dynamic balance adjustable permanent magnet motor rotor structure according to claim 2, characterized in that: The included angle of the V-shaped holes and the mounting holes is 130°-160°.

4. The magnetic leakage-proof and dynamic balance adjustable permanent magnet motor rotor structure according to claim 3, characterized in that: The permanent magnets in the V-shaped holes are arranged in sections.

5. The magnetic leakage-proof and dynamic balance adjustable permanent magnet motor rotor structure according to claim 4, characterized in that: ​

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