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

Abstract

The motor includes following structure: DC exciting coil are setup between armature windings on stator; corresponding permanent magnet is setup at outboard of the DC exciting coil; there is bridge of guiding magnetism between DC exciting coil and the permanent magnet; direction of magnetic field is along circumferencial direction in motor. Method of mixed excitation of combining permanent magnetism excitation with electricity excitation is adopted in weak magnetism control method for controlling excitation of motor. The method increases regulating range by using smaller electricity excitation, suitable to application needed of changing speed in large range.

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 ap...

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.

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