Method and apparatus for estimating rotor position of switched reluctance motor, and method and apparatus for sensorless control of switched reluctance motor

摘要

A discrete rotor position estimation method for a synchronized reluctance motor is provided. A d.c.-link voltage V_dc and a phase current I_ph are sensed. A flux-linkage lambda_ph of an active phase is calculated from the sensed d.c.-link voltage V_dc and the sensed phase current I_ph. The calculated flux-linkage lambda_ph is compared with a reference flux-linkage lambda_r. The reference flux-linkage lambda_r corresponds to a reference angle theta_r which lies between angles corresponding to aligned rotor position and non-aligned rotor position in the synchronized reluctance motor. An estimated rotor position theta_cal is obtained only once when the calculated flux-linkage lambda_ph is greater than the reference flux-linkage lambda_r.