A permanent magnet and variable reluctance parallel hybrid excitation brushless motor

Abstract

The invention relates to a permanent magnet and variable reluctance parallel mixed excitation brushless motor. The stator includes the stator core of the permanent magnet part, the stator core of the variable reluctance part, the non-overlapping concentrated armature winding embedded in the slots of the two parts of the stator, and the field winding wound on each stator tooth of the variable reluctance part; the rotor It includes the rotor core of the permanent magnet part and the permanent magnet embedded in it, and the salient pole rotor core of the variable reluctance part without winding. The stator and rotor of the permanent magnet part and the stator and rotor of the variable reluctance part are spaced apart on the left and right sides of the casing. The two parts of the magnetic circuit do not affect each other. The two rotors rotate coaxially. The two parts of the stator core A set of armature windings is shared; the back EMF of the motor has a high sine degree, and it can be used as an alternator / motor or as a DC generator / motor, which broadens the constant power range of the permanent magnet motor and solves the problem of permanent magnet generator Difficult voltage regulation and complete demagnetization due to short-circuit faults have broad application prospects in aircraft power starting / generating systems.

Description

technical field [0001] The invention relates to a parallel hybrid excitation brushless motor, in particular to a permanent magnet and variable reluctance parallel hybrid excitation brushless motor. Background technique [0002] Permanent magnet motors have a simple and reliable structure, high power density, and high efficiency. They are widely used in industries, aerospace, and ships. However, there are problems such as difficulty in adjusting the air gap magnetic field and the risk of irreversible demagnetization. For example, in the aircraft starting / power generation system, the motor is in a harsh environment such as high temperature and high pressure, and the permanent magnet is prone to irreversible demagnetization, and it is difficult to demagnetize due to failure. The hybrid excitation motor organically combines the permanent magnet motor and the electric excitation motor, and has the advantages of high power density and adjustable air gap magnetic field. In recent y...

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Problems solved by technology

Invention patent CN102843008A discloses a parallel hybrid excitation alternator, which realizes the efficient superposition of the induced potentials of two types of motors, but each stator pole of the electric excitation flux switching motor part is slotted for the excitation winding, and the structure is relatively complicated , the winding off-line is difficult

British scholars proposed a variable flux double salient pole motor, which has the advantages of adjustable air gap magnetic field, bipolar flux linkage, and high sine degree of back EMF, but the power density and efficiency are low in the electric excitation mode.

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