Permanent magnet auxiliary synchronous reluctance motor for electric vehicle

Abstract

The utility model discloses a permanent magnet auxiliary synchronous reluctance motor for an electric vehicle. The permanent magnet auxiliary synchronous reluctance motor for the electric vehicle comprises a shell, a stator assembly and a rotor assembly, the rotor assembly comprises a rotor core, a permanent magnet assembly and a motor shaft. The plurality of permanent magnet assemblies are uniformly distributed along the circumferential side of the rotor core; the permanent magnet assembly is of a triangular structure. The problem that a driving motor of an existing electro-tricycle is small in torque and cannot meet the performance requirement of the whole tricycle is solved. The permanent magnet auxiliary synchronous reluctance motor for the electric vehicle provided by the utility model has the advantages of low induced voltage, small linear current, high rotating speed, wide high-efficiency area and the like.

Description

Technical Field

[0001] This utility model belongs to the field of permanent magnet motor technology for vehicles, and more specifically, it relates to a permanent magnet assisted synchronous reluctance motor for electric vehicles. Background Technology

[0002] Electricity, as an environmentally friendly, clean, and highly efficient energy source, is widely used in production and daily life. Using electricity to drive the upgrading of transportation vehicles, promote the low-carbon development of the transportation industry, reduce transportation costs, save energy, and protect the environment is one of the important research topics in countries around the world. After decades of development, it has been applied in many fields such as electric city buses, electric transport vehicles in factories and mines, electric urban sanitation vehicles, and special vehicles for engineering, tunnel, and subway construction.

[0003] Electric tricycles are highly adaptable, maneuverable, easy to maintain, convenient to repair, and inexpensive, allowing them to navigate nimbly through narrow streets. Equipped with a reverse switch, they can easily reverse and travel in both directions, which is extremely useful in narrow alleys and lanes, making driving and parking very convenient. They are widely used in short-distance transportation for families, urban and rural areas, individual rentals, factories, mines, sanitation, and community cleaning.

[0004] However, the drive motors of electric tricycles usually use concentrated winding permanent magnet motors. The motors have very low magnetic reluctance torque and characteristics such as high induced voltage, large current, low speed, and narrow high efficiency range, which can no longer meet the high speed performance requirements of the whole vehicle. Utility Model Content

[0005] To address the problem that existing electric tricycle drive motors have low torque, failing to meet the performance requirements of the entire vehicle, the purpose of this invention is to provide a permanent magnet assisted synchronous reluctance motor for electric vehicles. The permanent magnet assisted synchronous reluctance motor for electric vehicles includes a housing, a stator assembly, and a rotor assembly; the rotor assembly includes a rotor core, permanent magnet components, and a motor shaft; multiple permanent magnet components are evenly distributed along the circumference of the rotor core; wherein, the permanent magnet components have a triangular structure.

[0006] Furthermore, the rotor core includes: a core body; a shaft hole, which is formed in the center of the core body and penetrates the core body; and a plurality of permanent magnet slot assemblies, which are evenly arranged along the periphery of the shaft hole; wherein the permanent magnet assemblies are embedded in the permanent magnet slot assemblies.

[0007] Furthermore, the permanent magnet slot assembly includes: a first permanent magnet slot, a second permanent magnet slot, and a third permanent magnet slot; the first permanent magnet slot and the second permanent magnet slot form a V-shaped structure with their tips facing the shaft hole, the third permanent magnet slot is located outside the first permanent magnet slot and the second permanent magnet slot, and the third permanent magnet slot and the open end of the V-shaped structure form a triangular permanent magnet slot assembly.

[0008] Furthermore, the first permanent magnet slot, the second permanent magnet slot, and the third permanent magnet slot are not interconnected.

[0009] Furthermore, the permanent magnet assembly includes a first permanent magnet component, a second permanent magnet component, and a third permanent magnet component; wherein, the ends of the first permanent magnet component, the second permanent magnet component, and the third permanent magnet component are all provided with magnetic isolation bridges.

[0010] Furthermore, the width of the magnetic bridge is 0.8-1mm.

[0011] Furthermore, the rotor core also includes a dummy slot, which is disposed on the surface of the rotor core and located on the side of the rotor core closer to the stator.

[0012] Furthermore, the stator assembly includes: a stator core and enameled wire; a plurality of stator winding slots are spaced apart on the inner side of the stator core, and the enameled wire is disposed in the stator winding slots; wherein the enameled wire is flat in shape.

[0013] Furthermore, the stator core is composed of multiple stacked annular stator laminations.

[0014] Furthermore, the stator assembly is heat-fitted into the housing.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] 1. By uniformly opening multiple permanent magnet slot components with a triangular structure on the periphery of the shaft hole, multiple permanent magnet components can be embedded in the multiple triangular permanent magnet slot components inside the iron core body. Compared with bonding the permanent magnet components to the surface of the iron core body, embedding the permanent magnet components inside the iron core body can make the permanent magnet components tightly combined with the iron core body, improve the stability of the magnetic field, thereby optimizing the distribution of the magnetic field and improving the performance of the motor.

[0017] 2. It is understandable that the triangular magnet assembly is equivalent to a V-shaped magnet structure composed of a first permanent magnet and a second permanent magnet, with a third permanent magnet on the outside, i.e., a double-layer magnet structure. Compared with a single-layer V-shaped magnet structure, it can further increase the saliency of the motor and improve the magnetic reluctance torque of the motor, thereby further optimizing the performance of the electric vehicle.

[0018] 3. Compared to round enameled wire, using flat enameled wire is beneficial to improving the slot fill factor of the motor. With the space remaining unchanged, more copper wire can be filled, thereby increasing the power density. Attached Figure Description

[0019] Figure 1 A cross-sectional schematic diagram of a permanent magnet assisted synchronous reluctance motor for electric vehicles provided by this utility model;

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0021] In the figure: 11, stator core; 12, enameled wire; 20, rotor core; 21, core body; 22, shaft hole; 23, permanent magnet assembly; 231, first permanent magnet component; 232, second permanent magnet component; 233, third permanent magnet component; 24, magnetic isolation bridge; 25, virtual slot. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0023] See Figure 1 This is a cross-sectional schematic diagram of a permanent magnet assisted synchronous reluctance motor for electric vehicles provided by this utility model. Combined with... Figures 1 to 2 The permanent magnet assisted synchronous reluctance motor for electric vehicles includes, for example, a housing, a stator assembly, and a rotor assembly; the rotor assembly includes a rotor core 20, permanent magnet components 23, and a motor shaft; a plurality of permanent magnet components 23 are evenly arranged along the periphery of the rotor core 20; wherein, the permanent magnet components 23 have a triangular structure.

[0024] It is understandable that by changing the shape of the permanent magnet assembly 23 and uniformly arranging multiple triangular permanent magnet assemblies 23 along the periphery of the rotor core 20, the saliency ratio of the motor can be increased, and the reluctance torque of the motor can be improved, thereby enhancing the motor's power performance and meeting the high torque performance requirements of electric vehicles. This results in the permanent magnet assisted synchronous reluctance motor for electric vehicles provided in this application having advantages such as low induced voltage, low line current, high speed, and a wide high-efficiency range.

[0025] Furthermore, the rotor core 20 includes, for example, a core body 21; a shaft hole 22, which is formed in the center of the core body 21 and penetrates the core body 21; and a plurality of permanent magnet slot assemblies, which are evenly arranged along the periphery of the shaft hole 22; wherein the permanent magnet assembly 23 is embedded in the permanent magnet slot assembly.

[0026] For example, the rotating shaft is rotatably disposed in the shaft hole 22, and the two ends of the rotating shaft are respectively connected to the front bearing sleeve and the rear bearing sleeve that are sealed on the end face, and are fixed on both sides of the housing.

[0027] It is understandable that by uniformly opening multiple triangular permanent magnet slot components on the periphery of the shaft hole 22, multiple permanent magnet components 23 can be correspondingly embedded in multiple triangular permanent magnet slot components inside the iron core body 21. Compared with bonding the permanent magnet components 23 to the surface of the iron core body 21, embedding the permanent magnet components 23 inside the iron core body 21 can make the permanent magnet components 23 tightly combined with the iron core body 21, improve the stability of the magnetic field, thereby optimizing the distribution of the magnetic field and improving the performance of the motor.

[0028] Furthermore, the permanent magnet slot assembly includes: a first permanent magnet slot, a second permanent magnet slot, and a third permanent magnet slot; the first permanent magnet slot and the second permanent magnet slot form a V-shaped structure with their tips facing the shaft hole 22, and the third permanent magnet slot is located outside the first permanent magnet slot and the second permanent magnet slot, and the third permanent magnet slot and the open end of the V-shaped structure form a triangular permanent magnet slot assembly.

[0029] Furthermore, the first permanent magnet slot, the second permanent magnet slot, and the third permanent magnet slot are not interconnected.

[0030] In one specific embodiment, the rotor core 20 has 8 poles, and each pole is composed of three magnets forming a triangular structure inserted into the first permanent magnet slot, the second permanent magnet slot, and the third permanent magnet slot. This magnet structure increases the saliency ratio of the motor and improves the magnetic reluctance torque of the motor.

[0031] Furthermore, the permanent magnet assembly 23 includes a first permanent magnet 231, a second permanent magnet 232, and a third permanent magnet 233; wherein, the ends of the first permanent magnet 231, the second permanent magnet 232, and the third permanent magnet 233 are all provided with magnetic isolation bridges 24. For example, the first permanent magnet 231, the second permanent magnet 232, and the third permanent magnet 233 are first magnets, second magnets, and third magnets; eight first magnets and eight second magnets form eight V-shaped structures with their tips facing the shaft hole 22, and eight third magnets are arranged at the open ends of the V-shaped structures, forming a triangular magnet assembly. The ends of the first magnets, second magnets, and third magnets are all provided with magnetic isolation bridges 24, which can both ensure the structural strength of the rotor and make full use of the magnetomotive force of the magnets to improve the air gap magnetic flux density and electromagnetic torque of the motor.

[0032] Preferably, the width of the magnetic bridge 24 is 0.8-1mm.

[0033] It is understandable that the triangular magnet assembly is equivalent to a V-shaped magnet structure composed of a first permanent magnet 231 and a second permanent magnet 232, with an outer layer of a third permanent magnet 233, i.e. a double-layer magnet structure. Compared with a single-layer V-shaped magnet structure, it can further increase the saliency of the motor and improve the magnetic reluctance torque of the motor, thereby further optimizing the performance of the electric vehicle.

[0034] Furthermore, the rotor core 20 also includes a dummy slot 25, which is disposed on the surface of the rotor core 20 and located on the side of the rotor core 20 closer to the stator. It is understood that the dummy slot 25 on the surface of the rotor core 20 can effectively reduce the motor cogging torque and decrease the harmonic components of the motor induced voltage.

[0035] Furthermore, the stator assembly includes a stator core 11 and enameled wires 12; the stator core 11 has multiple stator winding slots spaced apart on its inner side, and the enameled wires 12 are disposed within the stator winding slots; wherein the enameled wires 12 are flat in shape. For example, the stator core 11 is composed of several stacked annular stator laminations, with 48 slots spaced apart on the inner ring of the annular stator laminations, each slot containing 4 flat enameled wires 12.

[0036] Understandably, compared to round enameled wire 12, choosing flat enameled wire 12 is beneficial to improving the slot fill factor of the motor. With the space remaining unchanged, more copper wire can be filled, thereby increasing the power density.

[0037] Furthermore, the stator assembly is heat-fitted into the housing. For example, the housing is heated to expand its inner diameter, and then the housing is fitted over the stator core 11. After the housing cools down and contracts, an interference fit is formed between the stator core 11 and the housing.

[0038] Understandably, by heat-fitting the stator assembly into the housing, the position of the stator core 11 can be kept fixed during long-term operation of the motor or compressor, thus ensuring the stability of the motor's operation.

[0039] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A permanent magnet assisted synchronous reluctance motor for electric vehicles, characterized in that, The permanent magnet assisted synchronous reluctance motor for electric vehicles includes a housing, a stator assembly, and a rotor assembly; the rotor assembly includes a rotor core (20), a permanent magnet assembly (23), and a motor shaft; a plurality of permanent magnet assemblies (23) are evenly arranged along the periphery of the rotor core (20); wherein, the permanent magnet assembly (23) has a triangular structure; The stator assembly includes: a stator core (11) and enameled wire (12); the stator core (11) has multiple stator winding slots spaced apart on its inner side, and the enameled wire (12) is disposed in the stator winding slots; wherein the enameled wire (12) is flat in shape; the stator core (11) is composed of multiple annular stator laminations stacked together; 48 slots are spaced apart on the inner ring of the annular stator laminations, and each slot contains 4 flat enameled wires.

2. The permanent magnet assisted synchronous reluctance motor for electric vehicles according to claim 1, characterized in that, The rotor core (20) includes: Iron core body (21); A shaft hole (22) is formed in the center of the iron core body (21) and penetrates the iron core body (21); Multiple permanent magnet slot assemblies are evenly arranged along the periphery of the shaft hole (22); The permanent magnet component (23) is embedded in the permanent magnet slot component.

3. The permanent magnet assisted synchronous reluctance motor for electric vehicles according to claim 2, characterized in that, The permanent magnet slot assembly includes: a first permanent magnet slot, a second permanent magnet slot, and a third permanent magnet slot; the first permanent magnet slot and the second permanent magnet slot form a V-shaped structure with the tip facing the shaft hole (22), the third permanent magnet slot is located outside the first permanent magnet slot and the second permanent magnet slot, and the third permanent magnet slot and the open end of the V-shaped structure form a triangular structure of the permanent magnet slot assembly.

4. The permanent magnet assisted synchronous reluctance motor for electric vehicles according to claim 3, characterized in that, The first permanent magnet slot, the second permanent magnet slot, and the third permanent magnet slot are not connected to each other.

5. The permanent magnet assisted synchronous reluctance motor for electric vehicles according to claim 3, characterized in that, The permanent magnet assembly (23) includes a first permanent magnet (231), a second permanent magnet (232), and a third permanent magnet (233); wherein, the ends of the first permanent magnet (231), the second permanent magnet (232), and the third permanent magnet (233) are all provided with magnetic isolation bridges (24).

6. The permanent magnet assisted synchronous reluctance motor for electric vehicles according to claim 5, characterized in that, The width of the magnetic isolation bridge (24) is 0.8-1mm.

7. The permanent magnet assisted synchronous reluctance motor for electric vehicles according to claim 2, characterized in that, The rotor core (20) also includes: A dummy slot (25) is provided on the surface of the rotor core (20) and located on the side of the rotor core (20) closer to the stator.

8. The permanent magnet assisted synchronous reluctance motor for electric vehicles according to claim 1, characterized in that, The stator assembly is heat-fitted into the housing.

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