Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1978-11-28
1980-12-16
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318314, 318318, H02P 516
Patent
active
042400147
ABSTRACT:
The invention provides for a high dynamic performance of a frequency-voltage converter with minimum delay from frequency into voltage. Especially to provide for highly accurate maintenance of speed i.e. a fast control performance of a motor, a pulse train is derived upon operation of the motor in the form of recurring needle trigger pulses. A command pulse train is derived having pulse gaps which are longer than the trigger pulses and spaced from each other so that, if the speed of the motor is at the correct level, the trigger pulses will fall within the pulse gaps. During the time interval .DELTA.T between the end of a preceding command pulse T.sub.s and the next subsequent trigger pulse T.sub.i, a capacitor 22 is charged, the charge state of which will provide a control signal to control the supply of energy to the motor which, through a transducer, provides the speed-dependent trigger pulses.
REFERENCES:
patent: 3740633 (1973-06-01), Buttafava
patent: 3864610 (1975-02-01), Kawamoto et al.
patent: 3952237 (1976-04-01), Kimizuka
patent: 3983316 (1976-09-01), Schopp
patent: 4015180 (1977-03-01), Tetsugu et al.
patent: 4079942 (1978-03-01), Kunen
Papst-Motoren KG
Smith Jr. David
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