Novel unequal-area transposition flat wire winding permanent magnet motor

Abstract

The invention discloses a novel unequal-area transposition flat wire winding permanent magnet motor and belongs to the technical field of permanent magnet motors. The motor is characterized by comprising a stator iron core, a flat wire winding and an insulator, wherein the stator iron core and the flat wire winding jointly form a permanent magnet motor stator part, the stator winding comprises a large-area flat wire winding and a stranded flat wire winding which are placed in a stator core groove, the thickness of the stranded flat wire winding is smaller than that of the large-area flat wirewinding, and the insulation is divided into groove insulation arranged in the stator core groove and winding insulation arranged between adjacent windings; The unequal-area transposition flat wire winding not only can solve problems of low slot filling rate and low power density of the traditional round strand winding motor, but also can reduce the eddy current loss and the circulation loss of theflat wire winding, and can effectively reduce the temperature rise of the motor and improve efficiency of the motor on the premise of ensuring high power density.

Description

Technical field [0001] The present invention relates to the technical field of permanent magnet motors, and more specifically to a permanent magnet motor with unequal area transposed flat wire windings. Background technology [0002] With the continuous development of new energy electric vehicles, the demand for high power density and small volume drive motors has further increased, which requires innovative support from new structures, new materials, and new processes. As a new type of special motor, permanent magnet motors are widely used in new energy electric vehicles due to their small size, high efficiency, simple structure and many other advantages. The stator winding, as the core component of the permanent magnet motor, is directly related to the overall performance of the motor. However, at present, most motor stator windings mainly use traditional round strand wire windings. Motors using round strand wire windings have lower slot fullness and higher copper consumpt...

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Problems solved by technology

[0003] The motor speed and frequency of new energy vehicles are relatively high. Due to the large thickness of the flat wire winding, it will produce serious skin effect and proximity effect under the high-frequency magnetic field, which will lead to the increase of the AC resistance loss of the flat wire winding and eddy current loss, which will further cause the motor The efficiency is reduced. In order to solve this problem, the flat wire winding can be divided into multiple flat wire windings with a smaller area, but the electromotive force induced by the different leakage magnetic fields in the slots between the multi-strand windings will also be different. The circulating current is generated between the parallel strands, which further causes new circulation loss on the split flat wire winding

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