MOTOR CONTROL DEVICE

Proposed is a motor control device that executes rotational control that follows load fluctuations in a startup mode. The proposed motor control device is provided with: detection means 4 that detects a current peak value Ip and a current electrical angle ¸i based on phase currents lu to Iw; detection means 5 that detects an induced voltage peak value Ep and an induced voltage electrical angle ¸e based on phase currents lu to Iw and applied voltages Vu to Vw; rotor position detection means 6 that detects a rotor position ¸m using ¸m=¸i-²-90° or ¸m=¸e-³-90°; velocity fluctuation detection means 15 that detects a rotational velocity É based on this ¸m; and startup means 10 that outputs a startup voltage instruction value Vp and a startup voltage phase instruction value ¸v, increases the rotational velocity of the synchronous motor M with predetermined acceleration, and makes the rotational velocity É detected by the velocity fluctuation detection means 15 be reflected in ¸v.