A METHOD AND SYSTEM FOR DETERMINING ROTOR POSITION IN A SWITCHED RELUCTANCE MACHINE

摘要

A switched reluctance machine is controlled without using a physical rotor position detector. The rotor position at start-up is determined by simultaneously injecting a current of known magnitude into two phases. The rise times of the currents are measured and used to interrogate a stored table of rise time against rotor angle for the known current level. This produces two possible rotor positions from each rise time. Comparisons of the pairs of angles yields the actual position.