Disclosed in the present invention is a servo motor power line wiring phase sequence error detection method, comprising: determining maximum output torque Tmax of a servo motor; obtaining a torque observed value TL by means of a disturbance observer; determining whether the torque observed value TL exceeds a detection threshold M; and if the amplitude of load torque TL exceeds the maximum output torque Tmax of a servo system, considering that a motor power line phase sequence is wrong. The present invention implements on-line detection of the servo motor power line wiring phase sequence error; a detection process is automatically completed by a servo driver without additional operation of an operator; and an alarm is given upon detecting an error and the operation of a motor is stopped, thereby preventing high-speed uncontrolled operation of the motor. According to the present invention, the load torque observed value is obtained by means of the disturbance observer, thereby improving detection reliability and real-time performance; and no extra hardware costs is needed, and only a detection algorithm is added to a motor controller such as the servo driver and a frequency converter, so that engineering implementation is facilitated.
SERVO MOTOR POWER LINE WIRING PHASE SEQUENCE ERROR DETECTION METHOD