Method for detecting rotor position in non position sensor switch magnetic resistance motor

The invention provides a method for detecting rotor position of a switch reluctance motor without a position sensor, and belongs to the field of motor control. The invention aims at solving the problems existing in the prior method for indirectly detecting the rotor position that resisting moment and moment harmonic components occur in the motor rotor so that the efficiency of a motor system is reduced. The method comprises the following steps: 1, winding current i and busbar voltage U are sampled; and 2, according to the winding current in step one, instantaneous inductance (L) of the winding is acquired, and by looking up the winding instantaneous inductance (L) and rotor angle relation table, the rotor position is acquired. The method can lower manufacturing process of the switch reluctance motor, and has good application prospect in oil fields, coal mines, elevators, home appliances and the like.