| 摘要 |
PURPOSE:To facilitate detent control by creating speed error signal from a difference between the output and speed command from a one-side rotation sensor having the phase difference of 90 deg. fitted on a motor, and by detecting the rotational direction based on the output from both sensors and creating a detent signal. CONSTITUTION:On a motor 5a, an encoder 5b for generating the output of rotation detecting pulse ECPB having phase difference of 90 deg. between the pulse and the first rotation detecting pulse ECPA of a period corresponding to the rotational speed is fitted. The pulse ECPB and the output from a speed command generating section 1 are inputted to a speed error creating section 2, and speed error signal is created and inputted to a change-over section 6. By a detent signal creating section 7, the pulses ECPA, ECPB are compared with each other, and pulse for discriminating the rotational direction is created, and based on direction discriminating pulse, detent signal is created, and the input to the change-over section 6 is provided. Under speed control, the speed error signal is selected in the change-over section 6 during stoppage of motor, and via a driving section 3, the motor 5a is driver. As a result, with a simple circuit, detent control is facilitated in any position. |
