Abstract
A new method for flux weakening of either surface permanent magnet or buried permanent magnet machines is proposed in this article. This method, termed the double-bridge winding switching technique, can reliably double the field-weakening speed range of permanent magnet motors. This feature is significant since extending the constant power speed ratio of surface permanent magnet machines is a particularly challenging task due to the presence of low-permeability surface magnets and the resulting low machine inductance. In this method of field weakening, the usual three-phase motor windings are separated into two portions, and each portion is connected to an inverter. The article discusses the stator winding arrangement, which allows the normal and high-speed operation of the machine along with the constant output power and reports simulation results taken from finite-element analysis.
Published Version
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