Method for position recognition in direct instantaneous torque control of switch reluctance motor

The invention provides a method for position recognition in direct instantaneous torque control of a switch reluctance motor. A rotary transformer is used for measuring the position of a rotor of the switch reluctance motor; the measuring result is converted into a quadrature encoding pulse (QEP) signal through a digital converter; a DSP captures and counts QEP pulses; the electrode position and the energizing phase of the switch reluctance motor are determined according to the number of the QEP pulses in a unit zero signal (Z signal) period of the rotary transformer; an inductance period of the switch reluctance motor is evenly divided into a plurality of adjacent and continuous energizing zones, the number of the energizing zones being a multiple of 3, wherein the initiating end of the first energizing zone is the zero position of the rotary transformer and the M QEP pulses are evenly distributed in the energizing zones. The method uses 2048 counted QEP pulses to identify an energizing period (45 degrees) of the switch reluctance motor, so that the position search is more accurate and the problem of torque pulsation of the switch reluctance motor can be effectively solved.