Phase unbalance compensation in moving-coil type permanent magnet linear synchronous motor

摘要

The characteristics of the phase unbalance in a moving-coil type Permanent Magnet Linear Synchronous Mo-tor(PMLSM) for travelling the reciprocating trajectory are presented. The phase unbalance caused at end coils, such as deficiency and asymmetry of each phase EMF, is thoroughly investigated. Moreover, a compensating method that can minimize such phase unbalance by adjusting the mechanical air-gap length is proposed, and its effectiveness is verified in a practical application.