| 摘要 |
<p>PURPOSE:To perform an optimum brake control by scrupulously controlling the braking action in accordance with the motor speed reduction condition. CONSTITUTION:Assume that a DC motor section 20 changes its forward rotational speed from five times of standard speed to the standard speed then, the deviation amount data, which is inputted to a brake judgement processing circuit 14, becomes a negative number indicating a speed reduction. When this negative number becomes lower than -N, a brake decision processing circuit 24 reverses a forward/reversal rotation switching signal 500 and applies a brake to the DC motor section 20. This braking operation continues until the revolving speed of the motor section 20 becomes approximately the standard speed and furthermore, the speed control data outputted from the circuit 24, i.e., the brake voltage outputted from a D/A converter 25 varies in accordance with the rotational speed of the motor section 20. When the speed of the motor section 20 becomes the target speed, the circuit 24 puts the signal 500 back to the original and generates a speed control data based on the deviation data inputted from a frequency discriminator 22 through a gain phase compensator 23, outputted to the D/A converter so as to maintain the speed of the motor section 20 at the standard revolving speed.</p> |
