Abstract
Permanent magnet linear synchronous motors (PM-LSM) have been developed for factory automation, transportation applications and so on. The direct control of air gap flux is not available in the PM-LSM because the field flux is made by the permanent magnet. The air gap flux, however, can be weakened by the demagnetizing effect due to the d-axis armature reaction. This technique is called the flux-weakening. In the rotary type permanent magnet synchronous machines, the wide speed and constant power operation are realized by using the reluctance torque due to the saliency and the flux-weakening control.
In this paper, we examine the effect of interior permanent magnet arrangement for wide speed operation and the end effect in the linear structure.
