Motorregelsystem

摘要

A control system for a motor (2) is disclosed in which the position of a magnetic pole of the rotor of the motor is detected and a position signal is produced by a position detector (700, CP1 to CP7, R34), a multi-phase rectangular wave signal is oscillated by a multi-phase rectangular oscillation circuit (702, OP1 to OP3), the frequency of the position signal is multiplied to a predetermined frequency and produced as a multiple frequency signal by a frequency multiplier (712, C5, OP12), a phase of the rectangular wave signal of the multi-phase rectangular wave signal by a clear circuit (714, Tr1) a stepwise wave changing stepwisely with the same frequency as the multiple frequency in accordance with the multiple frequency signal and adapted to be cleared by the clear signal is generated by a stepwise wave generation circuit (716, OP11) a signal corresponding to the position signal or a phase difference signal between the multi-phase rectangular wave signal and the position signal is selectively applied as a drive signal to the motor by a drive signal switching circuit (718, OP3 to OP7), a first signal is produced before the stepwise wave from the stepwise wave generation circuit reaches a predetermined level and a second signal when the predetermined level is reached, by a speed detection circuit (720, OP16), and the validity or invalidity of the drive signal produced from the drive signal switching circuit is selectively designated by an instruction device (710, SW3). The drive signal switching circuit produces a signal corresponding to the position signal in response to the first signal thereby to drive the motor in brushless mode, and the phase difference signal in response to the second signal thereby to drive the motor in sync mode.