| 摘要 |
PURPOSE:To reduce the phase delay in a control loop by comparing an angular velocity signal of the amplitude in response to the angular velocity component of a sinusoidal wave AC signal proportional to the rotating speed of a motor with a reference angular velocity signal, thereby controlling the motor. CONSTITUTION:The absolute values of sin omegat and cos omegat are detected by absolute value detectors 31, 33 and a differentiator 32 from the sinusoidal wave AC signal of an AC generator 2 provided in a motor 1, set to signals representing the angles via tan<-1> circuit 34, further set to a signal representing the angular velocity by a differentiator 35, and inputted to a comparator 7 through an absolute value detector 36. It is then compared with the reference angle velocity signal of a reference voltage generator 8, and the motor 1 is controlled through a drive circuit 11. Accordingly, since it is not necessary to provide an integrator in the closed loop of control, the phase delay can be extremely reduced, a loop gain is increased, and the irregular rotation can be reduced. |
