MOTOR CONTROL DEVICE AND DRIVING SYSTEM PROVIDED WITH MOTOR CONTROL DEVICE

A motor control device controls an AC synchronous motor through sensorless control without using a rotor position sensor. The motor control device includes: a first position estimator that estimates a position of a rotor of the AC synchronous motor on a fixed coordinate system according to a first estimation method; a second position estimator that estimates the position of the rotor of the AC synchronous motor on a fixed coordinate system according to a second estimation method different from the first estimation method; and a drive control unit that drives the AC synchronous motor on the basis of the estimation results of the first position estimator and the second position estimator. 本发明的电动机控制装置通过不使用转子位置传感器的无传感器控制来控制交流同步电动机。该电动机控制装置包括：按照第1推定方法来推定固定坐标系上的所述交流同步电动机的转子的位置的第1位置推定器；按照不同于所述第1推定方法的第2推定方法来推定固定坐标系上的所述交流同步电动机的转子的位置的第2位置推定器；以及基于所述第1位置推定器和所述第2位置推定器的推定结果来驱动所述交流同步电动机的驱动控制单元。