High-power density electric motor with characteristics of axial and transverse magnetic fields

Abstract

The invention provides a high-power density electric motor with characteristics of axial and transverse magnetic fields. The high-power density electric motor is a permanent magnet motor which is of a disk type structure and composed of a stator, a rotor, an end cap, a shaft, a stator bearing and an end cap bearing. The rotor is arranged on the shaft, the two ends of the shaft are respectively mounted with the stator bearing and the end cap bearing; the stator bearing is mounted in a stator bearing chamber, the end cap bearing is arranged in an end cap bearing chamber; the stator and the end cap are fixed together through a through hole on a magnet ring at the outside of the stator and a screwed hole on the end cover by using a screw. The high-power density electric motor of the inventionimproves the structure of the traditional electric motor and the placement of an armature winding, so that the end of the armature winding can also be involved in electromechanical energy conversion of the electric motor; and as a result, power density and overall performance of the electric motor are improved.

Description

technical field [0001] The invention relates to a motor. In particular, it relates to a disc type permanent magnet motor with both axial and transverse magnetic field characteristics. Background technique [0002] The armature winding of an electric motor consists of a plurality of conductor edges placed in the core slots and winding ends for connecting these conductor edges. During the working process of the motor, the conductor edge located in the core slot cuts the main magnetic field of the air gap, generates induced electromotive force, and realizes electromechanical energy conversion. The end of the winding is located outside the main magnetic field of the air gap, not only does not participate in the electromechanical energy conversion of the motor, but also has the following adverse effects on the performance of the motor: [0003] (1) The magnetic field formed when the armature current flows through the end of the winding belongs to the leakage magnetic field. The...

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Problems solved by technology

[0003] (1) The magnetic field formed when the armature current flows through the end of the winding belongs to the leakage magnetic field. The existence of the leakage magnetic field will cause the waveform distortion of the main magnetic field of the air gap and increase the saturation degree of the core;

[0004] (2) The end of the winding is located outside the core slot, which is easy to be damaged by bumping when the motor is disassembled, and inter-turn short circuit or open circuit fault occurs, and in some transient processes of the motor, the excessive armature current impact will cause broken ends;

[0005] (3) Although the end of the winding does not participate in electromechanical energy conversion, it also needs to consume a certain amount of copper wire and generate corresponding copper loss, which will increase the cost, volume and weight of the motor and reduce the operating efficiency

[0008] (2) In these motors, the stator windings are not fully utilized, and there are still end structures with traditional windings

[0009] (3) It has and cannot realize the structure and function of eliminating the cogging moment proposed by the present invention

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