| 摘要 |
PURPOSE:To perform the control of rotation with high precision by detecting the rotary angle acceleration of a motor, applying negative feedback to the driving circuit of the motor according to the detecting signal for control, and thus obtaining electrically equivalent inertia moment. CONSTITUTION:According to the pulse of an encoder E obtained in accordance with the rotational speed of the motor M for driving a turnatable, a clock pulse from a reference oscillator X is opened and closed and is counted by a counter CT, while the output thereof is supplied to a comparison-operation circuits H1 and H2 through the intermediary of gate circuits G1 and G2 controlled by a flip-flop GX and compared with the data of registers R1 and R2, whereby the rotary angle acceleration is detected. And, the signal is made to be a feedback signal through the intermediary of latch circuits L1 and L2 and a D/A converter and added to the signal of the speed detector SD of the motor M, whereby the control is performed. Accordingly, the inertia moment can be obtained electrically and thereby highly precise rotational control can be performed. |
