A permanent magnet synchronous hub motor for electric vehicles and an electric vehicle for application thereof

Abstract

The invention discloses a permanent magnet synchronous hub motor for an electric vehicle and an electric vehicle used for the same, includes a stator assembly integrally connected to a motor shaft, apermanent magnet outer rotor assembly integrally connected with the hub of the electric vehicle, magnetically coupled with the stator assembly and coaxially outputted, the stator assembly comprising astator iron core stacked by a plurality of stator punches, the stator iron core having a plurality of winding slots and a stator winding located in the winding slot; The permanent magnet outer rotorassembly comprises a yoke ring and a plurality of permanent magnet steels fixedly spaced on the inner side of the yoke ring, wherein the aspect ratio range of the permanent magnet steels is 0.18-0.2;The invention realizes that the motor itself and the related performance of the electric vehicle are not negatively affected on the basis of lower permanent magnet steel thickness through special design.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and in particular relates to a permanent magnet synchronous hub motor for an electric vehicle, and also relates to an electric vehicle to which the permanent magnet synchronous hub motor is applied. Background technique [0002] In the field of electric vehicles, permanent magnet synchronous hub motors are usually used as the driving power source of the electric hub. Permanent magnet steel is an important part of permanent magnet synchronous hub motor. The thickness (length) L of the permanent magnet steel in the direction of magnetization and the equivalent radius of the area perpendicular to the direction of magnetization are radius R. Generally, the permanent magnet The ratio L / R of the thickness L of the steel to the radius R is called the aspect ratio of the permanent magnet steel. [0003] In the prior art, it has been verified through a large number of experimental studies and analysis th...

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Problems solved by technology

[0004] At present, there are also some technical proposals to reduce the thickness of the permanent magnetic steel to try to reduce the cost of materials. For example, the utility model patent with the authorized announcement number CN206807248U discloses an electric wheel hub motor. The inner diameter of the stator core is 214-234mm, and the stator The outer diameter of the iron core is 250mm, the axial thickness of the stator iron core is 18-23mm, and the thickness of the permanent magnet is 2-3mm. By increasing the outer diameter and inner diameter of the stator iron core, the axial thickness of the stator iron core can be reduced , and then reduce the amount of copper windings, while also reducing the thickness of the permanent magnets, as described in paragraph [0006] of the patent specification, this technical solution unilaterally reduces the thickness of copper windings and permanent magnets, which of course will cause motor However, due to the significant increase in the inner and outer diameters of the stator core and the significant reduction in weight, it can make up for the loss of motor performance; however, this technical solution will be different from the existing The adaptability of the size of the wheel hub in the technology is greatly limited, and the required size of the adapted wheel hub is also significantly increased, resulting in an increase in the weight of the wheel hub, which in turn brings new cost burdens and the work efficiency of the corresponding final application of electric vehicles

[0005] Another example is that the invention patent with publication number CN104753302A discloses a low-cost permanent magnet brushless DC motor for electric vehicles, which reduces the consumption of permanent magnet steel by arranging convex soft iron to make false poles, but the motor on the other hand Virtually sacrifices torque performance

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