Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1975-01-23
1977-08-09
Scott, James R.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318328, G05B 500, H02K 2720, H02P 500
Patent
active
040413624
ABSTRACT:
In a drive system for driving an electric motor at a given rotational speed, an electric power source drives the motor. A switching arrangement connected in series with the power source applies discontinuous pulses to the electric motor. A signaler coupled to the motor has an output corresponding to the rotational speed of the motor and actuates an oscillator which produces pulse signals in response thereto. A threshold circuit responds to the pulse signals and to the signal generator and controls the switching arrangement. According to another arrangement, a bistable multivibrator is coupled to the motor and produces an output corresponding to the speed of the motor. A trigger then triggers a monostable multivibrator that produces pulses having times related to the desired speed of the motor. An AND gate responds to the two multivibrators and sets a flip-flop which is reset in response to the bistable multivibrator so that the flip-flop can drive driving means coupled to the motor for controlling the speed of the motor.
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Canon Kabushiki Kaisha
Scott James R.
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