Rotor punching sheet structure of permanent magnet synchronous motor for electric motorcycle and rotor thereof
By optimizing the magnetic circuit design of the rotor laminations of the permanent magnet synchronous motor for electric motorcycles, and adopting a V-shaped magnetic steel slot and air-isolated magnetic slot structure, the problems of large leakage flux and small magnetic reluctance torque are solved, thereby improving the motor's torque and power density, improving the motor's operating efficiency and noise, and expanding the high-efficiency operating range.
Patent Information
- Application Number
- CN202520439510.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-13
AI Technical Summary
The rotor laminations of existing permanent magnet synchronous motors for electric motorcycles have not undergone magnetic circuit optimization, resulting in large leakage flux, small magnetic reluctance torque, and large cogging torque. This reduces the motor's torque and power density, causes a low power factor, poor sinusoidal back EMF, low efficiency, high vibration and noise, a small high-efficiency operating range, and insufficient field weakening speed extension capability.
By optimizing the magnetic circuit design, adopting V-shaped magnet slots and air-insulated magnetic slot structures, the magnetic reluctance torque is increased, the cogging torque is reduced, and the magnetic lower bridge and V-shaped magnet slot positions are installed to reduce leakage flux, increase magnetic flux density and sinusoidal properties, and enhance the high-efficiency operating range and field weakening speed extension capability of the motor.
It improves the motor's torque and power density, enhances the power factor, sinusoidal nature of back EMF and efficiency, reduces noise, expands the high-efficiency operating range, and strengthens the motor's field weakening speed extension capability.
Smart Images
Figure CN223912332U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a rotor lamination structure, concretely relates to an electric motorcycle permanent magnet synchronous motor rotor lamination structure and belongs to the permanent magnet synchronous motor rotor lamination technical field. BACKGROUND
[0002] The electric motorcycle is one kind of electric vehicle, which is driven by a battery, and the electric power driving and control system is composed of a driving motor, a power supply and a speed control device of the motor, and other devices of the electric motorcycle are basically the same as those of the internal combustion engine, and the electric motorcycle is divided into an electric light motorcycle and an electric ordinary motorcycle according to the maximum speed or the motor power.
[0003] However, the current electric motorcycle permanent magnet synchronous motor rotor lamination is usually a whole lamination, the magnetic circuit is not optimized, the leakage magnetic flux is not reduced, the motor leakage magnetic flux is large, the reluctance torque is small, the cogging torque is large, the motor torque and power density are reduced, the power factor, the sine property of back electromotive force, the efficiency and the torque fluctuation of the permanent magnet synchronous motor in the working operation cannot be improved, the power factor is low, the sine property of back electromotive force is poor, the efficiency is low, the vibration noise is large, the high efficiency operation area of the permanent magnet synchronous motor is small, and the motor weak magnetic speed expansion capacity cannot be expanded. UTILITY MODEL CONTENTS
[0004] The utility model discloses a kind of electric motorcycle permanent magnet synchronous motor rotor lamination structure, by magnetic circuit optimization, reduce leakage magnetic flux, increase reluctance torque, reduce cogging torque, improve motor torque and power density, improve the power factor, the sine property of back electromotive force, the efficiency and the torque fluctuation of permanent magnet synchronous motor in the working operation, effectively expand the high efficiency operation area of permanent magnet synchronous motor, expand the weak magnetic speed expansion capacity of motor, reduce noise.
[0005] The utility model discloses a kind of electric motorcycle permanent magnet synchronous motor rotor lamination structure, including stator and the rotor lamination axially laminated in the inside of stator, the inside of the stator is equipped with multiple rotor laminations laminated together, multiple V-shaped magnetic steel grooves are equidistantly equipped on the rotor lamination, and multiple V-shaped magnetic steel grooves are symmetrically equipped with two groups V-shaped magnetic steel groove positions about magnetic steel groove magnetic lower bridge, two top ends of multiple V-shaped magnetic steel grooves are symmetrically equipped with magnetic steel groove air gap magnetic groove about magnetic steel groove magnetic lower bridge, two bottom ends of multiple V-shaped magnetic steel grooves are symmetrically equipped with magnetic steel groove air gap magnetic groove about magnetic steel groove magnetic lower bridge, V-shaped magnetic steel groove magnetic bridge located at the edge of rotor lamination is equipped between two groups of adjacent V-shaped magnetic steel grooves, multiple V-shaped magnetic steel grooves are equipped with magnetic steel, pinhole is equipped on the rotor lamination, and weight-removing hole is equipped on the rotor lamination.
[0006] Preferably, the cross section of the V-shaped magnetic steel groove on both sides of the magnetic steel groove magnetic lower bridge is in a linear structure, and the multiple weight-removing holes are one-to-one corresponding to the bottoms of the multiple V-shaped magnetic steel grooves.
[0007] Preferably, the pinholes are arranged in a ring array, and the multiple pinholes are staggered between the weight-removing holes, and the cross section of the weight-removing hole is in a trapezoidal structure.
[0008] Preferably, the magnetic steel groove air gap magnetic groove outside the magnetic steel groove air gap magnetic groove near the outer diameter of the rotor lamination is recessed, and the magnetic steel groove air gap magnetic groove near the outer diameter of the rotor lamination is protruded.
[0009] Preferably, the V-shaped magnetic steel groove magnetic bridge is protruded, and the two ends of the V-shaped magnetic steel groove magnetic bridge are inclined.
[0010] Preferably, the thickness of the magnetic steel groove air gap magnetic groove is equal to the thickness of the magnetic steel, and the magnetic steel is in a linear structure.
[0011] Preferably, the inner circle edge of the weight-removing hole is concentric with the inner circle edge of the rotor lamination, and each weight-removing hole is provided with chamfer at four corners.
[0012] The utility model also provides a kind of electric motorcycle permanent magnet synchronous motor rotor, and the electric motorcycle permanent magnet synchronous motor rotor includes electric motorcycle permanent magnet synchronous motor rotor lamination structure.
[0013] The utility model has the advantages that:
[0014] (1) Each group of V-shaped permanent magnet grooves forms a pole, and each pole is arranged with V-shaped magnetic steel, to improve the direct-axis inductance of the motor, increase the reluctance torque, improve the high-efficiency operation area of the driving motor, and expand the motor speed range.
[0015] (2) The rotor punching sheet is formed with multiple groups of permanent magnet grooves at equal interval angles, which simplifies the embedding process of the permanent magnet and facilitates the installation of the magnetic steel.
[0016] (3) The air magnetic isolation grooves are arranged at both ends of the permanent magnet to weaken the magnetic flux leakage of each magnetic pole, enhance the main magnetic flux of the motor and improve the power factor during the operation of the motor.
[0017] (4) The air magnetic isolation groove is arranged near the outer diameter of each group of V-shaped permanent magnets, which is modified to make the magnetic pole air gap magnetic flux closer to the sine, effectively reduce the motor torque and motor torque fluctuation, reduce the motor no-load loss and motor load NVH, and reduce the noise. BRIEF DESCRIPTION OF DRAWINGS
[0018] Fig. 1 It is a whole structure schematic view of the utility model;
[0019] Fig. 2 It is a connection structure schematic view of the rotor punching sheet, V-shaped magnetic steel groove magnetic bridge, V-shaped magnetic steel groove and pin hole of the utility model;
[0020] Fig. 3 It is a connection structure schematic view of the rotor punching sheet, V-shaped magnetic steel groove and magnetic steel groove air magnetic isolation groove near the outer diameter end of the rotor of the utility model.
[0021] In the figure: 1, rotor punching sheet; 2, V-shaped magnetic steel groove magnetic bridge; 3, V-shaped magnetic steel groove; 4, V-shaped magnetic steel groove position; 5, magnetic steel groove air magnetic isolation groove near the outer diameter end of the rotor; 6, magnetic steel groove air magnetic isolation groove near the inner diameter end of the rotor; 7, magnetic steel groove magnetic lower bridge; 8, pin hole; 9, weight removal hole; 10, magnetic steel; 11, stator. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0023] Please refer to Figs. 1-3As shown in the electric motorcycle permanent magnet synchronous motor rotor lamination structure, including the stator 11 and the rotor lamination 1 and the rotor axially laminated in the stator 11, the inside of the stator 11 is provided with a plurality of laminated rotor laminations 1, a plurality of V-shaped magnetic steel grooves 3 are equidistantly arranged on the rotor lamination 1, and a magnetic steel groove magnetic lower bridge 7 is arranged at the plurality of V-shaped magnetic steel grooves 3, two groups of V-shaped magnetic steel groove positions 4 are symmetrically arranged on the plurality of V-shaped magnetic steel grooves 3 about the magnetic steel groove magnetic lower bridge 7, two top ends of the plurality of V-shaped magnetic steel grooves 3 are symmetrically provided with magnetic steel groove outer diameter end air magnetic separation grooves 5 about the magnetic steel groove magnetic lower bridge 7, two bottom ends of the plurality of V-shaped magnetic steel grooves 3 are symmetrically provided with magnetic steel groove inner diameter end air magnetic separation grooves 6 about the magnetic steel groove magnetic lower bridge 7, two adjacent groups of V-shaped magnetic steel grooves 3 are provided with V-shaped magnetic steel groove magnetic bridges 2 located at the edge of the rotor lamination 1, a plurality of magnetic steels 10 are arranged in the plurality of V-shaped magnetic steel grooves 3, a pin hole 8 is arranged on the rotor lamination 1, and a weight removal hole 9 is arranged on the rotor lamination 1.
[0024] As a technical optimization scheme of the utility model, the cross section of the V-shaped magnetic steel groove 3 on both sides of the magnetic steel groove magnetic lower bridge 7 is in a linear structure, and a plurality of weight removal holes 9 correspond to the bottoms of a plurality of V-shaped magnetic steel grooves 3 one by one, so that the overall mechanism is more compact, the magnetic resistance torque is increased, the high-efficiency operation area of the driving motor is improved, the V-shaped magnetic steel groove 3 expands the motor speed range, and the magnetic steel 10 is fixed and will not move when the motor rotates at high speed.
[0025] As a technical optimization scheme of the utility model, the pin hole 8 is arranged in a plurality of annular arrays, and a plurality of pin holes 8 and weight removal holes 9 are arranged in a staggered manner, and the cross section of the weight removal hole 9 is in a trapezoidal structure, so that the weight of the entire rotor lamination 1 can be reduced, and the rotation is more stable.
[0026] As a technical optimization scheme of the utility model, the magnetic steel groove outer diameter end air magnetic separation groove 5 outside the outer diameter of the rotor lamination 1 is recessed, so that the width of the magnetic steel groove outer diameter end air magnetic separation groove 5 is smaller than the middle width of the V-shaped magnetic steel groove 3; the main function of the design is that when the thickness of the motor magnetic steel 10 is large and the tooth width of the motor stator is small, the motor magnetic pole width and the motor pole arc coefficient can be flexibly adjusted, so that the motor torque is improved, and the motor torque fluctuation is reduced; the magnetic steel groove inner diameter end air magnetic separation groove 6 outside the outer diameter of the rotor lamination 1 is protruded, so that the length of the V-shaped magnetic steel groove magnetic bridge 2 is greater than the thickness of the V-shaped magnetic steel groove 3; the design function is to design a longer V-shaped magnetic steel groove magnetic bridge 2, which can ensure the strength of the V-shaped magnetic steel groove magnetic bridge 2 when the motor rotates at high speed, and can reduce the magnetic leakage of the magnetic steel 10 as much as possible, thereby saving the amount of magnetic steel 10.
[0027] As a technical optimization scheme of the utility model, the V-shaped magnetic steel groove magnetic bridge 2 is protrudingly arranged, and the two ends of the V-shaped magnetic steel groove magnetic bridge 2 are obliquely arranged, the thickness of the magnetic steel groove air gap magnetic groove 5 close to the outer diameter end of the rotor punching sheet 1 is equal to the thickness of the magnetic steel 10, the magnetic steel 10 is in a character form structure, the strength of the V-shaped magnetic steel groove magnetic bridge 2 is increased, the motor magnetic resistance torque is increased, and the motor output torque is increased.
[0028] As a technical optimization scheme of the utility model, the inner circle edge of the weight-removing hole 9 and the inner circle edge of the rotor punching sheet 1 share a common center, and each of the weight-removing holes 9 is provided with chamfers at four corners, and the electric motorcycle permanent magnet synchronous motor rotor includes an electric motorcycle permanent magnet synchronous motor rotor punching sheet structure, so that the overall structure constitutes a permanent magnet synchronous motor rotor, the magnetic circuit is optimized, and the magnetic flux leakage is reduced.
[0029] The utility model discloses when producing rotor punching sheet 1, the outside of rotor punching sheet 1 is equidistantly provided with multiple protruding V-shaped magnetic steel groove magnetic bridge 2, is used to increase motor magnetic resistance torque from the increase motor output torque, equidistantly sets up multiple V-shaped structure's V-shaped magnetic steel groove 3 on rotor punching sheet 1, is used to install magnetic steel 10, the design of V-shaped magnetic steel groove 3 is: air gap magnetic density is more sinusoidal, reduces motor harmonic content, can promote motor efficiency, increases motor magnetic resistance torque from the increase motor output torque, 3 promotes motor weak magnetic expansion speed ability, sets up magnetic steel groove magnetic lower bridge 7 at the bottom of multiple V-shaped magnetic steel groove 3, improves motor speed, increases motor weak magnetic expansion speed ability, and the clearance of each character of each V-shaped magnetic steel groove 3 is fixed magnetic steel 10, and magnetic steel 10 will not move when the motor high -speed rotation, is provided with the magnetic steel groove air gap magnetic groove 5 of magnetic steel 10 thickness on the outer circle of rotor punching sheet 1, the magnetic steel groove air gap magnetic groove 5 close to the outer diameter of rotor punching sheet 1 is recessed on the outside, so that the width of magnetic steel groove air gap magnetic groove 5 is less than the width of the middle of V-shaped magnetic steel groove 3, the main role of the design is that when the thickness of motor magnetic steel 10 is larger, and the motor stator tooth width is smaller, the motor magnetic pole width and motor pole arc coefficient can be flexibly adjusted, so that the motor torque is improved, and the motor torque fluctuation is reduced, the magnetic steel groove air gap magnetic groove 6 of magnetic steel groove air gap magnetic groove 6 towards the inner diameter of rotor punching sheet 1 is protruding, so that the length of V-shaped magnetic steel groove magnetic bridge 2 is greater than the thickness of V-shaped magnetic steel groove 3, the design role is to design longer magnetic bridge, can guarantee the strength of V-shaped magnetic steel groove magnetic bridge 2 when the motor high -speed operation, and as far as possible, the magnetic steel 10 leakage is less, the amount of magnetic steel 10 is saved, finally, the rotor punching sheet 1 of installing magnetic steel 10 is stacked together and placed to the inside of stator 11, the weight-removing hole 9 can be used for the calibration of multiple rotor punching sheets 1, and multiple rotor punching sheets 1 are installed and fixed through the pin bolt cooperation pin hole 8.
[0030] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.
[0031] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.
Claims
1. A rotor lamination structure of a permanent magnet synchronous motor for electric motorcycles, comprising a stator (11) and a rotor lamination (1) axially laminated inside the stator (11), characterized in that: The inside of the stator (11) is provided with a plurality of rotor laminations (1) stacked together, a plurality of V-shaped magnetic steel grooves (3) are equidistantly arranged on the rotor lamination (1), and a magnetic steel groove magnetic lower bridge (7) is arranged at each of the plurality of V-shaped magnetic steel grooves (3). Two groups of V-shaped magnetic steel groove positions (4) are symmetrically arranged on each of the plurality of V-shaped magnetic steel grooves (3) with respect to the magnetic steel groove magnetic lower bridge (7). A magnetic steel groove outer diameter end air magnetic separation groove (5) is symmetrically arranged on both top ends of the plurality of V-shaped magnetic steel grooves (3) with respect to the magnetic steel groove magnetic lower bridge (7). A magnetic steel groove inner diameter end air magnetic separation groove (6) is symmetrically arranged on both bottom ends of the plurality of V-shaped magnetic steel grooves (3) with respect to the magnetic steel groove magnetic lower bridge (7). A V-shaped magnetic steel groove magnetic bridge (2) is arranged between two adjacent groups of V-shaped magnetic steel grooves (3) at the edge of the rotor lamination (1). A magnetic steel (10) is arranged inside each of the plurality of V-shaped magnetic steel grooves (3). A pin hole (8) is arranged on the rotor lamination (1). A weight-removing hole (9) is arranged on the rotor lamination (1).
2. The rotor lamination structure of a permanent magnet synchronous motor for electric motorcycles according to claim 1, characterized in that: The cross section of the V-shaped magnetic steel groove (3) on both sides of the magnetic steel groove magnetic lower bridge (7) is in a straight line shape, and the plurality of weight-removing holes (9) correspond one-to-one to the bottoms of the plurality of V-shaped magnetic steel grooves (3).
3. The rotor lamination structure of a permanent magnet synchronous motor for electric motorcycles according to claim 1, characterized in that: The pin hole (8) is arranged in a ring array, and the plurality of pin holes (8) are arranged in a staggered manner between the weight-removing holes (9). The cross section of the weight-removing hole (9) is in a trapezoidal shape.
4. The rotor lamination structure of a permanent magnet synchronous motor for electric motorcycles according to claim 1, characterized in that: The magnetic steel groove outer diameter end air magnetic separation groove (5) near the outer diameter of the rotor lamination (1) is recessed on the outside, and the magnetic steel groove inner diameter end air magnetic separation groove (6) near the outer diameter of the rotor lamination (1) is protruded on the outside.
5. The rotor lamination structure of a permanent magnet synchronous motor for electric motorcycles according to claim 1, characterized in that: The V-shaped magnetic steel groove magnetic bridge (2) is protruded, and the two ends of the V-shaped magnetic steel groove magnetic bridge (2) are inclined.
6. The rotor lamination structure of a permanent magnet synchronous motor for electric motorcycles according to claim 1, characterized in that: The thickness of the magnetic steel groove outer diameter end air magnetic separation groove (5) is equal to the thickness of the magnetic steel (10), and the magnetic steel (10) is in a straight line shape.
7. The rotor lamination structure of a permanent magnet synchronous motor for electric motorcycles according to claim 1, characterized in that: The inner circle edge of the weight-removing hole (9) and the inner circle edge of the rotor lamination (1) share the same center, and each of the weight-removing holes (9) is provided with a chamfer at the four corners.
8. A permanent magnet synchronous motor rotor for an electric motorcycle, characterized by: The electric motorcycle permanent magnet synchronous motor rotor includes the electric motorcycle permanent magnet synchronous motor rotor lamination structure according to any one of claims 1-7.