Design and Analysis of Wide Speed-Regulated Reverse Salient-Pole Variable Leakage Flux Interior Permanent Magnet Machine

A novel wide speed-regulated reverse salient-pole variable leakage flux interior permanent magnet (RSP-VLF-IPM) machine is proposed, in this paper. The unique advantage of the proposed motor, in contrast to the conventional interior permanent magnet (IPM) motor with a constant permanent magnet field, is the ability to control the leakage flux by armature magnetomotive force. Additionally, the proposed motor can operate in the region where the magnetic field is enhanced due to its reverse salient-pole characteristic. To elaborate on the working principle of the RSP-VLF-IPM machine, a magnetic circuit analysis is conducted. Furthermore, the performance of the two motors is reasonably analysis using 2D finite element analysis. The simulation results show that the proposed motor offers a wider speed range and higher efficiency.