Wide governing, double salient pole, mixed excitation brushless dynamo and weak magnet control method thereof

Abstract

The double salient pole hybrid excitation brushless motor with wide speed regulation is a double salient pole brushless motor suitable for electric vehicles and other applications that require a wide range of variable speed operation. Its structure is the stator of the doubly salient pole hybrid excitation motor (2) A DC excitation coil (4) is arranged between the armature windings (5) on the top, and a permanent magnet (7) is correspondingly provided on the outside of the DC excitation coil (4). Between the DC excitation coil (4) and the permanent magnet (7) ) is provided with a magnetic bridge (6), and the magnetic field direction of the permanent magnet (7) is along the circumferential direction of the motor. Its field-weakening control method is to use the method of hybrid excitation combining permanent magnet excitation and electric excitation to carry out stepless field-weakening control on double salient pole hybrid excitation motor, and use smaller electric excitation to increase the speed regulation range of the motor.

Description

technical field [0001] The invention relates to a double-salient pole permanent magnet brushless motor suitable for electric vehicles and other application occasions requiring large-scale variable-speed operation, and belongs to the technical field of double-salient pole brushless motor manufacturing. technical background [0002] In the early 1990s, American motor expert T.A. Lipo and others aimed at the shortcomings of switched reluctance motors, and installed modern high-performance permanent magnets on the stator or rotor of switched reluctance motors to form a new type of motor—double salient permanent magnets. motor. The existing research results show that the doubly salient motor has the advantages of high power density, simple structure, good fault tolerance and flexible control. However, due to the inherent characteristics of permanent magnet materials, the excitation of doubly salient permanent magnet motors cannot be adjusted, and its...

AI Technical Summary

Problems solved by technology

[0004] The first two solutions are both mechanical, requiring special tools and difficult to operate

In the first solution, it is also necessary to ensure that the permanent magnet can slide freely in the iron core, which not only increases the additional air gap, but also makes the manufacture and installation more complicated. The disadvantages of the first two solutions are obvious and have little practical value

Scheme 3 is simple in structure, easy to control, and has certain practicability. However, in the process of wide speed regulation operation of the motor, the number of control turns must be frequently switched, and there will be a large voltage and current change rate in the armature winding, which requires a special continuation Current or energy feedback circuit, the control cost is relatively increased

In Scheme 4, because high-performance permanent magnets are not used, only DC excitation is used, and the excitation loss increases, and the efficiency of the motor will also be affected to a certain extent.

Images