On the bases of analyzing two typical direct estimation methods of rotor speed, a novel sensorless technique of permanent magnet synchronous motor (PMSM) direct torque control (DTC) is put forward in this paper.

• 通过分别计算出定子磁链矢量角位移与转矩角，将后者从前者中减去得到转子磁链矢量的角位移进而得到转子速度信号，并采用改进积分器取代传统的积分器。