| 摘要 |
PURPOSE:To make accurate motor current control possible by making sure that the feedback signal of a motor current is always inverted in response to the variation in flow direction of the motor current in a direct current servomotor control circuit. CONSTITUTION:The direct current servomotor control circuit consists of a summing amplifier 6 which sums the motor current command value from a host equipment and feedback signals of a motor current, PWM conversion circuit 7, switching control circuit 8, drive circuit 13, polarity discrimination circuit 10, current detection circuit 12 for detecting the motor current, analog switch 9 and inverting amplifier 11. The servomotor control circuit is also provided with a sign discrimination circuit 19 for discriminating the sign of motor current detection signals. When the direction of a motor current is changed, the sign is immediately discriminated and the analog switch 9 setting is changed over, so that the feedback signal of the motor current is always inverted. |
