| 摘要 |
<p>PURPOSE:To preferably control a motor without influence of variation in the internal resistance of the motor by providing feedback means for supplying counterelectromotive force of the motor to the motor as a control voltage. CONSTITUTION:Switches 37, 41 44 are in open state at the normal drive time, and a switch 19 is in a grounded state. In a forcible stopping operation, the switch 37 becomes in a grounded state. When a sample pulse (a) is ''H'' level, the switches 39, 41, 44 are respectively connected with terminals A. Then, since sufficiently low resistor 42 is connected in parallel with an operational amplifier 35, the voltage applied to a terminal 34 becomes ''0''. At this time, a capacitor 45 is charged by the voltage generated at both ends of a counterelectromotive force detecting resistor 33. Then, when a sample pulse (a) becomes ''L'' level, the switches 39, 41, 44 are switched to be connected with idle terminal B, and the control voltage discharged from the capacitor 45 is applied to the inverting input terminal of the amplifier 35.</p> |
