Multitooth magnetic bridge type hybrid excitation magnetic flux switching motor

Abstract

The invention discloses a multitooth magnetic bridge type hybrid excitation magnetic flux switching motor. Permanent magnets, an armature winding and a single-phase excitation winding are installed on a stator; the tooth number of the stator is four times of the number of the permanent magnets; and part of a rotor part is a salient pole, and a rotor has no winding or permanent magnets and has simple and firm structure. An air gap magnetic field comprises an electric excitation magnetic field generated by the excitation winding and a magnetic field generated by the permanent magnets and is adjusted by changing the magnitude and the direction of excitation current, thereby improving the rotating speed operating range and the magnetic weakening capability of the motor. An electric excitation magnetic force line is connected with a magnetic bridge for closing after penetrating through an iron core at the top of the permanent magnets, which is beneficial to reducing the electric excitation ampere turns. The invention has parallel connecting structure of the excitation winding and the permanent magnet in space, bipolarity of phase magnetic flux, large magnetic chain change amplitude value and higher torque output capability and power density and is suitable for a low-speed straight application occasion.

Description

technical field [0001] The invention relates to a design technology of a stator hybrid excitation motor structure, which belongs to the technical field of motor design, in particular to a multi-tooth magnetic bridge type hybrid excitation magnetic flux switching motor. Background technique [0002] Permanent magnet synchronous motors use permanent magnet materials instead of excitation windings, there is no excitation copper loss, the volume and weight of the motor are greatly reduced, and it has the advantages of high power density, high efficiency, simple structure, convenient maintenance, and reliable operation. However, since the permanent magnets are placed on the rotor, corresponding fixing devices need to be installed on the rotor, which causes cooling difficulties, and the temperature rise may eventually lead to irreversible demagnetization of the permanent magnets, which limits the output of the motor and reduces the power density. [0003] Switched reluctance motor...

AI Technical Summary

Problems solved by technology

[0005] The permanent magnet flux switching motor adopts the permanent magnet excitation method and cannot directly change the magnetic field strength. When it is used as a generator, it has a large voltage adjustment rate and it is difficult to demagnetize when it fails.

Images