regulation and control system for electric traegheitsarme

摘要

1400521 Automatic control of speed HONEYWELL INFORMATION SYSTEMS ITALIA SpA 28 July 1972 [26 Aug 1971] 35448/72 Heading G3R A motor 16 driving a tape recorder capstan 5 is provided with an automatic speed control at its normal running speed and provision where during acceleration a constant current is applied to the motor. In the system described the motor speed is measured by an optical pulse generator which supplies pulses through limiting amplifier 63 to pulse generator 64 which supplies short duration pulses to reference monostable circuit 65 which is triggered by the incoming pulses to produce error pulses whose duration represents the difference between the required and actual motor speed. Each pulse is converted into a voltage by capacitor 68 or 74 and the voltage applied through either resistor 24 or 25 to the input of control amplifier 17. On starting, the current through the motor will produce in series resistor 29 a voltage e 1 at point 90 on the voltage divider shown in Fig. 4 which is outside a predetermined value and causes one opposite pair of diodes to conduct thereby applying a constant voltage at input 19 of amplifier 17. Direction signals are applied through logic circuitry to the terminals 73, 75 to control which capacitor 68, 74 is used. This logic signal is arranged to apply a reverse direction signal to stop the motor.