Variable Magnetization Machine in Electrified Vehicle Application

Abstract

SUMMARY This paper describes variable magnetization machines, which are capable of varying the magnetization state (MS) of permanent magnets during operation. A pulse current on the stator windings creates a magnetic field on the rotor; this can be used to manipulate the MS of the rotor magnets. Regulating the MS according to the machine operating condition can reduce machine losses. A proof‐of‐principle machine was designed and fabricated. A series of experiments was conducted to evaluate the torque–speed envelope and efficiency contours of the fabricated machine. A full‐scale machine was then designed with a modified magnetic circuit for application to an electric vehicle and evaluated using finite element analysis. A control strategy for the MS during machine operation is proposed, and the losses during a driving cycle with the strategy were evaluated.

Reduced Order Modeling of Half-Wave Rectified Brushless Synchronous Motor for Model-Based Design

“…However, there have been still few research reports on ROM modeling technology for variable field flux motor (20) . Especially, in the electromagnetic simulation of variable field flux motor with rectifying diode, there are several modeling approaches such as either simulating detailed behavior of diode devices on/off or replacing them with ideal behavior.…”