Servomotor control system enabling high-speed oscillating motion to be highly precise

A servomotor control system, having a control unit and a servo control unit, that controls a servomotor, provided in a machine tool or an industrial machine, that drives a driven body cyclically oscillating at high speed, wherein:

• the control unit includes
• a reference angle calculating means for calculating a reference angle ωt at time “t” (=nT, where n is 1, 2, 3, . . . ) from an angular velocity ω given according to the machining condition and the commanded distribution cycle T, and
• an oscillation command calculating means for calculating a cyclic oscillation command according to the reference angle and a machining condition;
• the servo control unit includes
• a position detecting means for detecting a position of the servomotor,
• a positional difference calculating means for calculating, for each commanded distribution cycle, a positional difference between a position in the oscillation command and the detected position of the servomotor, and
• a learning control means for performing learning control on the basis of the reference angle, the oscillation command, and the positional difference;
• and wherein
• the positional difference calculated by the positional difference calculating means is corrected by the learning control means, and the corrected positional difference is used to control driving of the servomotor.