| 摘要 |
PURPOSE:To turn the synchronous motor at fixed torque by using signals from a detector generating positional modulation signals for the positional feedback of the motor. CONSTITUTION:Command value voltage Vref from a speed command value generating section 11-1 and speed signals K2E(dtheta/dt) through a speed signal converting section 15 from the detector 21 connected to the synchronous motor 20 are inputted to an adder 12, the error signals ERR are inputted to a multiplier 14 together with phase modulation signals Esin(omegat+theta) from the detector 21 through an amplifier 13, and both are multiplied. The output of the multiplier 14 is each inputted to synchronous rectifying sections 16, 18, rectified 16, 18 synchronously by reference signals S1, S2, which have the carrier frequency of the phase modulation signals Esin(omegat+theta) supplied from an oscillator 23 and the phase difference of 90 deg., and each fed to the sine winding and the cosine winding of the synchronous motor 20 through power amplifiers 17, 19. |
