Permanent magnet auxiliary synchronous reluctance motor for electric tricycle

Abstract

The utility model relates to the technical field of permanent magnet motors, in particular to a permanent magnet auxiliary synchronous reluctance motor for an electric tricycle, and the motor comprises a housing; the rotor is arranged in the shell, and the rotor comprises a rotor iron core; the stator is arranged in the shell, the stator comprises a stator iron core, the stator iron core is arranged outside the rotor iron core, a plurality of mounting grooves are uniformly distributed in the stator iron core, and two flat enameled wires are arranged in each mounting groove; as the plurality of mounting grooves are uniformly distributed on the stator core, and two flat enameled wires are arranged in each mounting groove, the flat enameled wires enable the motor to have the advantages of low induced voltage, small line current, high rotating speed and wide high-efficiency area, so that the comprehensive performance of the motor is greatly improved to meet the requirements of the electro-tricycle.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of permanent magnet motor, in particular to a permanent magnet auxiliary synchronous reluctance motor for electric tricycle. BACKGROUND

[0002] The stator of the permanent magnet motor adopts permanent magnet, and the rotor is equipped with coil, without excitation coil and excitation current, high efficiency and simple structure, which is a good energy-saving motor. With the development of high-energy permanent magnet, the permanent magnet motor has been widely used in new energy vehicles, electric bicycles, household appliances and other fields.

[0003] At present, the conventional driving motor of electric tricycle generally adopts concentrated winding permanent magnet motor (stator 12 slots, rotor 10 poles), and the motor reluctance torque is very small, so that the motor speed is low and the high efficiency area is narrow, which cannot meet the requirements of high-speed driving. CONTENT OF THE INVENTION

[0004] In view of the deficiencies or problems in the prior art, the present disclosure provides a permanent magnet auxiliary synchronous reluctance motor for electric tricycle, which has the advantages of low induced voltage, small line current, high speed and wide high efficiency area.

[0005] The technical solution adopted by the present disclosure to solve the above technical problems is: a permanent magnet auxiliary synchronous reluctance motor for electric tricycle, comprising:

[0006] a housing;

[0007] a rotor, the rotor is arranged in the housing, and the rotor comprises a rotor core;

[0008] a stator, the stator is arranged in the housing, and the stator comprises a stator core, the stator core is arranged outside the rotor core, and a plurality of mounting grooves are uniformly arranged on the stator core, and two flat enameled wires are arranged in each mounting groove.

[0009] In some embodiments, the flat enameled wire is aluminum enameled wire.

[0010] When aluminum enameled wire is used, the motor load line current can be reduced, the current density of aluminum enameled wire can be reduced, the motor efficiency and temperature rise are equivalent to those of the same type of permanent magnet auxiliary synchronous reluctance motor. In this way, the motor cost is reduced on the basis of ensuring the motor performance, thereby improving the product competitiveness.

[0011] As a preferred embodiment, the stator core is composed of a plurality of circular ring-shaped stator punching sheets.

[0012] As a preferred embodiment, the stator core is hot-fitted in the housing.

[0013] As a preferred embodiment, the mounting groove is forty-eight.

[0014] As a preferred embodiment, the shell is provided with a front bearing sleeve and a rear bearing sleeve for end face sealing, the rotor further comprises a motor shaft, the rotor core is provided with a mounting hole, the motor shaft passes through the mounting hole, and the two ends of the motor shaft are connected with the shell through the front bearing sleeve and the rear bearing sleeve respectively.

[0015] As a preferred embodiment, the circumferential direction of the rotor core is uniformly provided with a plurality of groove groups, and the groove groups are used for mounting permanent magnets.

[0016] As a preferred embodiment, the groove groups are eight, the groove groups include a first groove, a second groove and a third groove, the first groove and the second groove form a V-shaped structure, the opening of the V-shaped structure faces the stator core, the third groove is located at the opening of the V-shaped structure, the first groove is provided with a first permanent magnet, the second groove is provided with a second permanent magnet, and the third groove is provided with a third permanent magnet. The structure of the groove group makes the three permanent magnets in each group arranged in a substantially triangular structure, and the structure can increase the saliency ratio of the motor and improve the reluctance torque of the motor.

[0017] As a preferred embodiment, one end of the first permanent magnet and the second permanent magnet close to each other is a first close end, the first close end is provided with a first magnetic isolation bridge, and the first magnetic isolation bridge is arranged between the first permanent magnet and the second permanent magnet.

[0018] As a preferred embodiment, one end of the first permanent magnet away from the first close end is a second end of the first permanent magnet, and a second magnetic isolation bridge is arranged between the second end of the first permanent magnet and the stator core.

[0019] As a preferred embodiment, one end of the second permanent magnet away from the first close end is a second end of the second permanent magnet, and a third magnetic isolation bridge is arranged between the second end of the second permanent magnet and the stator core.

[0020] As a preferred embodiment, a fourth magnetic isolation bridge is arranged between the third permanent magnet and the stator core.

[0021] As a preferred embodiment, the widths of the first magnetic isolation bridge, the second magnetic isolation bridge, the third magnetic isolation bridge and the fourth magnetic isolation bridge are 0.8-1mm. Such width can ensure the structural strength of the rotor and maximize the use of the magnetic potential of the magnetic steel, thereby improving the air gap flux density and electromagnetic torque of the motor.

[0022] As a preferred embodiment, a virtual slot is arranged on the surface of the rotor core. The virtual slot can effectively reduce the gear slot torque of the motor and reduce the harmonic component of the motor induced voltage.

[0023] Compared with the prior product, since the plurality of mounting grooves are uniformly arranged on the stator core, two flat enameled wires are arranged in each mounting groove, compared with the circular enameled wire, the flat enameled wire can improve the slot fill rate of the motor, in the case of unchanged space, more conductors can be filled, the power density is improved, the motor has the advantages of low induced voltage, small line current, high speed and wide high-efficiency area, so that the comprehensive performance of the motor is greatly improved to meet the needs of the electric tricycle. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described in detail below in conjunction with the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the present application. In addition, unless specifically indicated, the drawings only schematically represent the composition or structure of the described objects and can include exaggerated display, and the drawings are not necessarily drawn to scale.

[0025] Figure 1 is one of the structural schematic diagrams of a permanent magnet auxiliary synchronous reluctance motor for an electric tricycle of the present disclosure;

[0026] Figure 2 is one of the structural schematic diagrams of a permanent magnet auxiliary synchronous reluctance motor for an electric tricycle of the present disclosure;

[0027] Figure 3 is one of the structural schematic diagrams of a permanent magnet auxiliary synchronous reluctance motor for an electric tricycle of the present disclosure; Figure 2 is a partial enlarged view of A in the present disclosure.

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 1, stator core; 2, rotor core; 3, groove group; 4, mounting hole; 5, first groove; 6, second groove; 7, third groove; 8, mounting groove; 9, flat enameled wire; 10, virtual slot; 11, first magnetic isolation bridge; 12, second magnetic isolation bridge; 13, third magnetic isolation bridge; 14, fourth magnetic isolation bridge. DETAILED DESCRIPTION

[0030] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail, clearly and completely in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and do not limit the present disclosure.

[0031] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the utility model.

[0032] Please refer to Figure 1 As shown in the drawings, the application provides a permanent magnet auxiliary synchronous reluctance motor for an electric tricycle, comprising: a shell; a rotor, the rotor is arranged in the shell, and the rotor comprises a rotor core 2; and a stator, the stator is arranged in the shell, and the stator comprises a stator core 1, the stator core 1 is arranged outside the rotor core 2, and forty-eight installation grooves 8 are uniformly arranged on the stator core 1, two flat enameled wires 9 are arranged in each installation groove 8, due to the adoption of the flat enameled wire 9 structure, compared with a circular enameled wire, the flat enameled wire 9 can improve the slot fill factor of the motor, more conductors can be filled under the condition that the space is unchanged, the power density is improved, the motor has the advantages of low induced voltage, small line current, high speed and wide high-efficiency area, so that the comprehensive performance of the motor is greatly improved, and the performance of the electric tricycle is optimized.

[0033] Specifically, the flat enameled wire 9 is an aluminum enameled wire, which can reduce the motor load line current, reduce the current density of the aluminum enameled wire, so that the motor efficiency and temperature rise are equivalent to those of the same type of permanent magnet auxiliary synchronous reluctance motor. In this way, the motor cost is reduced on the basis of ensuring the performance of the motor, and the product competitiveness is improved.

[0034] In an embodiment of the present disclosure, the stator core 1 is composed of a plurality of circular ring-shaped stator punching sheets, and the installation grooves 8 are arranged in the inner ring of the circular ring-shaped stator punching sheets. The stator core 1 is hot-fitted in the shell, the shell can be heated to expand the inner diameter to become larger, then the shell is sleeved outside the stator core 1, and then the shell is cooled to shrink, so that the stator core 1 and the shell are in interference fit.

[0035] Further, the shell is provided with a front bearing sleeve and a rear bearing sleeve for end face sealing, the rotor further comprises a motor shaft, the rotor core 2 is provided with a mounting hole 4, the motor shaft passes through the mounting hole 4, and the two ends of the motor shaft are connected with the shell through the front bearing sleeve and the rear bearing sleeve respectively.

[0036] Please refer to Figure 2 and Figure 3As shown, it should be noted that the rotor core 2 is uniformly provided with eight groove groups 3 in the circumferential direction, and the groove groups 3 are used to install permanent magnets. Specifically, each groove group 3 includes a first groove 5, a second groove 6 and a third groove 7, the first groove 5 and the second groove 6 form a V-shaped structure, the opening of the V-shaped structure faces the stator core 1, and the third groove 7 is located at the opening of the V-shaped structure. The first groove 5 is provided with a first permanent magnet, the second groove 6 is provided with a second permanent magnet, and the third groove 7 is provided with a third permanent magnet. The first permanent magnet, the second permanent magnet and the third permanent magnet are all magnetic steel. The structure of the groove group 3 makes the three permanent magnets in each group arranged in a roughly triangular structure. The high linear magnetic characteristics of the magnetic steel and the special structure of the rotor make the magnetic steel rotor of the triangular structure more stable, have higher speed and output power, increase the saliency ratio of the motor, and improve the magnetic reluctance torque of the motor. In addition, the magnetic steel rotor of the triangular structure reduces the friction between the rotor and the stator, so that the noise of the machine can be reduced during operation.

[0037] Further, in order to avoid the leakage coefficient of the permanent magnet being too large and causing the utilization rate of the permanent magnet to be too low, a magnetic isolation bridge is also provided. Specifically, one end of the first permanent magnet and the second permanent magnet close to each other is a first approaching end, the first approaching end is provided with a first magnetic isolation bridge 11, and the first magnetic isolation bridge 11 is arranged between the first permanent magnet and the second permanent magnet. One end of the first permanent magnet away from the first approaching end is a second end of the first permanent magnet, and a second magnetic isolation bridge 12 is arranged between the second end of the first permanent magnet and the stator core 1. One end of the second permanent magnet away from the first approaching end is a second end of the second permanent magnet, and a third magnetic isolation bridge 13 is arranged between the second end of the second permanent magnet and the stator core 1. A fourth magnetic isolation bridge 14 is arranged between the third permanent magnet and the stator core 1. Preferably, two fourth magnetic isolation bridges 14 are arranged between the third permanent magnet and the stator core 1, and the two fourth magnetic isolation bridges 14 are arranged close to the two ends of the third permanent magnet respectively.

[0038] Further, the width of the first magnetic isolation bridge 11, the second magnetic isolation bridge 12, the third magnetic isolation bridge 13 and the fourth magnetic isolation bridge 14 is 0.8-1mm. Such width setting can not only ensure the structural strength of the rotor, but also maximize the use of magnetic steel magnetic potential, improve the motor air gap magnetic density and electromagnetic torque.

[0039] As shown in Figure 2 and Figure 3 as a preferred embodiment, a virtual slot 10 is opened on the surface of the rotor core 2. The virtual slot 10 can effectively reduce the motor tooth slot torque and reduce the harmonic component of the motor induced voltage.

[0040] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A permanent magnet assisted synchronous reluctance motor for electric tricycles, characterized in that, include: case; The rotor is disposed within the housing and includes a rotor core (2); The stator is located inside the housing and includes a stator core (1). The stator core (1) is located outside the rotor core (2). The stator core (1) is provided with a plurality of mounting slots (8) evenly distributed on the stator core (1). Each mounting slot (8) is provided with two flat enameled wires (9).

2. The permanent magnet assisted synchronous reluctance motor for electric tricycles according to claim 1, characterized in that, The flat enameled wire (9) is an aluminum enameled wire.

3. The permanent magnet assisted synchronous reluctance motor for electric tricycles according to claim 1, characterized in that, There are forty-eight mounting slots (8).

4. The permanent magnet assisted synchronous reluctance motor for electric tricycles according to claim 1, characterized in that, The housing is provided with a front bearing sleeve and a rear bearing sleeve for end face sealing. The rotor also includes a motor shaft. The rotor core (2) is provided with a mounting hole (4). The motor shaft passes through the mounting hole (4). The two ends of the motor shaft are connected to the housing through the front bearing sleeve and the rear bearing sleeve, respectively.

5. The permanent magnet assisted synchronous reluctance motor for electric tricycles according to claim 1, characterized in that, The rotor core (2) is evenly provided with multiple groove groups (3) in the circumferential direction, and the groove groups (3) are used to install permanent magnets.

6. The permanent magnet assisted synchronous reluctance motor for electric tricycles according to claim 5, characterized in that, The groove group (3) consists of eight grooves, including a first groove (5), a second groove (6) and a third groove (7). The first groove (5) and the second groove (6) form a V-shaped structure with the opening of the V-shaped structure facing the stator core (1). The third groove (7) is located at the opening of the V-shaped structure. The first groove (5) is provided with a first permanent magnet, the second groove (6) is provided with a second permanent magnet, and the third groove (7) is provided with a third permanent magnet.

7. The permanent magnet assisted synchronous reluctance motor for electric tricycles according to claim 6, characterized in that, The first proximity end is the end where the first permanent magnet and the second permanent magnet are close to each other. The first proximity end is provided with a first magnetic isolation bridge (11), which is located between the first permanent magnet and the second permanent magnet.

8. The permanent magnet assisted synchronous reluctance motor for electric tricycles according to claim 7, characterized in that, The end of the first permanent magnet that is away from the first approach end is the second end of the first permanent magnet, and a second magnetic isolation bridge (12) is provided between the second end of the first permanent magnet and the stator core (1).

9. The permanent magnet assisted synchronous reluctance motor for electric tricycles according to claim 7, characterized in that, The end of the second permanent magnet that is away from the first approach end is the second end of the second permanent magnet, and a third magnetic isolation bridge (13) is provided between the second end of the second permanent magnet and the stator core (1).

10. The permanent magnet assisted synchronous reluctance motor for electric tricycles according to claim 6, characterized in that, A fourth magnetic isolation bridge (14) is provided between the third permanent magnet and the stator core (1).

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