Patent application title: MOTOR CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To control a motor so as to avoid step-out during drive control of the motor when difference between a measured advance angle and a target advance angle is large.SOLUTION: A motor control device performs advance angle control of a motor in response to a position detection signal of a rotor shaft 202. A drive waveform table storage part 104 stores drive waveform data, and a CPU 101 obtains an address value of a drive waveform table by synchronizing with the position detection signal. When difference which is calculated from a target phase value of a drive waveform in the advance angle control and a phase value of a drive waveform obtained at timing of this position detection signal exceeds a threshold, the CPU 101 performs control for restricting a phase change amount that is corrected by changing a cycle of the drive waveform. When the calculated difference is the threshold or less, the CPU 101 performs control for changing the cycle so that the phase value of the drive waveform corresponds with the target phase value at a time when a transition time corresponding to an adjustment phase value has passed from a current time.SELECTED DRAWING: Figure 1