Patent ID: 9281773
Filing Date: 2016-03-08
CPC Classification: H02P

Claim Text:
1. A position sensorless step-wise freewheeling control method for a switched reluctance motor, including a power supply, windings of a switched reluctance motor, and a power converter including a main switch and diodes with an upper tube S 1 and a lower tube S 2 in the power converter of the main switch of a phase in an OFF state and the winding of the phase in the switched reluctance motor in DC negative voltage forced freewheeling state, comprising the steps of: setting a threshold for a winding current of the phase, and detecting the winding current i of the phase; switching on either the lower tube S when the rotor position of the switched reluctance motor is a start position b of minimum phase inductance of the phase when the winding current i of the phase rises up to a peak value, acquiring the start position b of minimum phase inductance of the phase, taking the acquired value as the switch-on position θ