A parallel BLDC FSPM machines with wide fluxweakening capability

Abstract

As solutions to the problem of flux-weakening in brushless DC (BLDC) motor, sophisticated control methods and high switching frequency in flux-switching permanent magnet motors, this paper presents a novel parallel permanent magnet fluxswitching motor, which inherits the advantages of permanent magnet motor, e.g. high power and torque density, and good fluxweakening capability. Based on motor topology, this paper makes a detailed analysis on the motor flux-linkage and the back EMF. The flux-weakening capability of motor is analyzed on the basis of the circuit model of the brushless DC motor when operating. Finite element simulation results prove the motor back EMF is trapezoidal waveform, and it is suitable for brushless DC occasions. Moreover, MATLAB simulation proves the motor has a good performance in flux-weakening. Keywords-permanent magnet flux-switching motor; brushless DC (BLDC) motor; flux-weakening capability; parallel permanent magnet flux-switching motorI.