Preliminary study on adjustable field NdFeB permanent magnet motor based on permeability modulation technique

Abstract

Abstract This paper describes an adjustable field permanent magnet (PM) motor based on a permeability modulation technique. The proposed motor has leakage magnetic flux paths between the rotor magnetic poles. The permeability modulation is a technique for controlling the amount of the leakage magnetic flux by manipulating the permeability of the magnetic paths. This paper proposes two adjustable field PM motor models based on the permeability modulation technique. One is a model using electromagnetic steel sheets and different kind of metal materials in the rotor, and the other is a model using only the electromagnetic steel sheets in the rotor. The paper presents some computer simulation results and makes a comparison between the two models.