Rotor-permanent-magnetic type doubly-salient motor

Abstract

The invention discloses a rotor-permanent-magnetic type doubly-salient motor. The rotor-permanent-magnetic type doubly-salient motor comprises a stator iron core, armature coils, a rotor iron core and permanent magnets, wherein the stator iron core and the rotor iron core are of salient structures; the stator iron core is provided with stator teeth; each coil in the armature coils cross on one stator tooth; the rotor iron core comprises U-shaped magnetic-permeating units and a ring-shaped magnetic-permeating bridge; the U-shaped magnetic-permeating units are fixed on the magnetic-permeating bridge and are opposite to the stator teeth; the quantity of the permanent magnets is equal to that of the U-shaped magnetic-permeating units; and the permanent magnets are embedded between every two U-shaped magnetic-permeating units, are magnetized tangentially and are consistent in the magnetizing direction. The rotor-permanent-magnetic type doubly-salient motor disclosed by the invention has the advantages of doubly-salient armature permanent-magnetic chains and high-sine each-phase no-load inductive potential, and simultaneously has the advantages of higher space utilization rate and permanent-magnet utilization rate and high torque density and power density.

Description

technical field [0001] The invention relates to a motor, in particular to a rotor permanent magnet double salient pole motor. Background technique [0002] As the energy crisis continues to intensify, it has become a worldwide consensus to use permanent magnet excitation instead of electric excitation to save energy consumption. The development, research and promotion of rare earth permanent magnet motors with new structures has important theoretical significance and practical value. In particular, new energy electric vehicles, which are currently widely studied, require the motor drive system to be small in size, light in weight, high in efficiency, large in output, and high in reliability, making permanent magnet motors show a broader application prospect. [0003] Stator-PM doubly-salient brushless motor, as a typical permanent magnet brushless motor, was developed in the 1990s with the development of power electronics, microelectronics, control theory, etc. A new type o...

AI Technical Summary

Problems solved by technology

[0005] (1) Since the permanent magnet is placed in the stator, the magnetic flux leakage of the permanent magnet on the stator side is serious, which reduces the utilization rate of the permanent magnet

In addition, except for the flux-switching structure, the air-gap magnetic field density of the stator permanent magnet motor with the other two structures is low, and the torque density and power density are relatively small;

[0006] (2) For the stator permanent magnet type doubly salient pole brushless motor, since the permanent magnet and the armature winding are located on the stator side with limited space, even if the permanent magnet is replaced by the electric excitation winding, the excitation mechanism must be in contact with the armature winding There is competition for stator space, which reduces the slot area of ​​the armature winding and easily leads to deep saturation of the stator core, thereby further limiting the power density of the motor;

[0007] (3) On the other hand, in the stator permanent magnet type double salient pole brushless motor, the rotor part does not contain any excitation mechanism and armature winding, and is only pressed into a salient pole solid rotor by magnetically conductive punching sheets, so that the utilization of rotor space The rate is low, which further weakens the torque density and power density of the motor

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