| 摘要 |
PURPOSE:To provide a DC motor speed control device which is free from uneven rotating speed and has excellent characteristics. CONSTITUTION:A speed error detecting circuit 4 outputs an error signal and a speed control circuit 5 outputs a torque signal so as to eliminate the error signal of the circuit 4. A torque pattern generating circuit a7 outputs a torque signal of such a pattern that can offset a cogging torque. A multiplying circuit 10 multiplies the output of a torque pattern generating circuit b7 by the current value of a current value detecting circuit 9 and outputs an torque signal. The outputs of the circuits 5, a7, and 10 are synthesized at an adding circuit 11 and a drive circuit 2 generates the torque corresponding to the signal of the circuit 11 against a motor 1. Therefore, the influences of cogging torques and torque ripples can be eliminated and a DC motor speed control device motor which is free from uneven rotation and has excellent characteristics can be obtained. |
