Extended Speed Range Control of Axial Flux Ironless PMSM using Current-Source Inverter

Abstract

Axial flux ironless permanent magnetic synchronous motor (AFIPMSM) is a new permanent magnetic motor. It has many advantages, such as little volume, low mass, low lost, high power density, no cogging torque, and the sinusoidal back EMF. It gradually becomes the good choice in drive system. However, because of the coreless structure and the long air gap, the winding inductance is small, which causes the current is not continued with the PWM control based on VSI. On the other hand, the armature reaction is so small that it is difficulties to weakening flux. The motor only be working under the base speed. To solve this problem, a novel speed control strategy to operate a current source inverter (CSI) driven AFIPMSM. And a modified dc-dc converter is used to boost the voltage of DC-link, which can extend the operating ranges of speed. Simulation and experimental results confirm the validity of the proposed control method.