Motor control method and motor control apparatus

摘要: A motor control apparatus 1 that controls a rotation speed of driven according to command includes an abnormal-rotation detector 21 which determines the is in state, such as runaway, when deviation Ver obtained by subtracting detection TSA from VCMD equal or larger than threshold value, sign product acceleration ΔTSA last this time detected predetermined cycle and torque Tc proportionally integrating negative, integration value VerSUM exceeds ALMlevel. With arrangement, abnormal can be instantly even during deceleration motor, thereby increasing performance protecting motor.