Induction excitation type mixed excitation brushless synchronous motor

Abstract

The invention relates to an induction excitation type mixed excitation brushless synchronous motor which structurally comprises a stator and a rotor. The stator comprises a stator core, an armature stator winding and a stator excitation winding, wherein the armature stator winding and the stator excitation winding are arranged in a stator groove. The rotor comprises a rotor core, permanent magnets, a plurality of rotor excitation windings, rectifier diodes and a rotary shaft, wherein the plurality of rotor excitation windings are independent from one another and short-circuited through the diodes respectively. The permanent magnets are arranged on the rotor, and the number of the permanent magnets can be determined as various forms according to an excitation requirement. When direct current is led into the stator excitation winding, constant magnetic fields are built in air gaps. When the rotary shaft rotates at the synchronous speed, excitation current of pulse vibration is inducted on the rotor windings, the size of air gap magnetic fields is changed, and output voltage of the motor is controlled by changing current intensity in the stator excitation winding. The induction excitation type mixed excitation brushless synchronous motor has the advantage of being free of brush slip ring, requiring no exciters, being simple in structure and achieving brushless excitation of the rotor excitation mixed excitation motor.

Description

technical field [0001] The invention relates to an induction excitation hybrid excitation brushless synchronous motor, which belongs to the field of brushless excitation synchronous motors. Background technique [0002] The induction excitation electric excitation synchronous motor was first proposed by Japanese scholars in the 1960s. The main excitation winding of this kind of motor is placed on the rotor. In order to realize the brushless excitation of the rotor excitation motor, a set of stator excitation windings is added to the stator. When the stator excitation coil is fed with direct current, the rotor excitation current is induced on the rotor excitation winding, so as to realize the brushless excitation of the motor. Compared with the traditional three-stage brushless excitation scheme, this kind of motor can realize the brushless excitation of the rotor excitation motor without an exciter, which greatly reduces the volume of the power generation system. But the ...

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Problems solved by technology

Due to the existence of permanent magnets, the power density of hybrid excitation motors is much higher than that of electric excitation motors, which can solve the problem of low excitation efficiency in traditional solutions

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