High-power density electric vehicle motor

Abstract

The invention relates to a high-power density electric vehicle motor, which comprises a rotor and a stator, wherein the stator is located in the rotor; a plurality of stator slots which are evenly distributed up and down are arranged in a circular region of the stator; an annular coil is arranged in each stator slot; the regions between the adjacent stator slots are magnetic-conducting regions; each magnetic-conducting region comprises magnetic poles, a winding slot bottom and annular windings; the magnetic poles are distributed in a straight line; the rotor comprises permanent magnets and inclined magnetizers; the permanent magnets are evenly arranged obliquely; the inclined magnetizers and the permanent magnets are correspondingly distributed; a small through hole or no through hole is formed in the center of the stator; and the structure of each stator slot is in a round shape or a roundish shape or a square shape with a round angle. The high-power density electric vehicle motor can improve the power density of the motor, especially can improve the torque density of the motor, and can fully develop the magnetic permeability and the frequency performance of a permeability magnetic material in structure.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular to a high power density electric vehicle motor. Background technique [0002] In the development of motor technology, seeking higher power density and torque density is one of the important directions. Limited by the performance limits of current conventional materials, the improvement of these two indicators is limited. In the current technology, there are high-power motor designs, which often need to be realized by increasing the speed. In applications, especially in electric vehicles, the working area The matching needs to be realized through the reducer, the structural complexity of the whole system increases, and the index decreases. [0003] For example, the current popular electric vehicle benchmark Tesla electric vehicle, the main motor needs to be matched with a reducer of about 9:1 to realize the connection between the driving motor and the wheels, which is not conducive t...

AI Technical Summary

Problems solved by technology

[0007] The motor in CN103329410A needs to increase the power density again, and will be limited by the current density. In the design of this motor of YASA, there are many (typically such as 24) stator assemblies with concentrated windings. In this way, in the effective plane of the stator On the one hand, there is a stator magnetic conduction magnetic circuit and a stator winding section at the same time. The two structures compete with each other. On the other hand, the stator winding also has a winding efficiency problem, which is determined by the effective section of the winding and the actual circumference. Obviously, the more complicated the shape of the winding or the smaller the winding, the lower the efficiency of the winding. It is reflected from the design of the motor that the copper loss of the motor increases.

Of course, there are also some improvements in the structure of CN103283126A. The winding efficiency of the motor in the design is not too high, and most of the area in the middle of the winding is the non-effective area. At the same time, it can be seen from the structure of the rotor that the The surface-mounted permanent magnet structure, the magnetic circuit is a series structure, the magnetic field operating point of the motor cannot be too high, which is equivalent to reducing the winding efficiency of the stator

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