Study on doubly-fed hybrid poles permanent magnet synchronous machine

A new hybrid excitation permanent machine-doubly fed hybrid excitation permanent magnet synchronous machine without rotor winding is presented. The structure, mathematic model and operation principle of the machine are introduced. It is shown that excitation regulation can be realized by changing the current of stator control winding. The field control performance in the generator and motor operation state is studied by theoretic calculation and experiment. Not only the machine has the advantages of brushless, high power density and efficiency, but also voltage regulation for generator and field weakening control for motor can be achieved.