G - Physics – 01 – P
Patent
G - Physics
01
P
318/96, 340/148.
G01P 3/48 (2006.01) H02P 23/00 (2006.01) H02P 25/10 (2006.01)
Patent
CA 1098604
ABSTRACT A circuit for controlling the speed of an electric motor when the motor is coupled to a tachogenerator which pro- vides an a.c. output frequency which is proportional to the rotational speed. A circuit for processing the tachogenerator a.c. output includes a voltage level detection means responsive to the a.c. output, first gating means responsive to an output of the detection means to produce key pulses whose duration is inversly proportional to the rotational speed and second gating means responsive to an output of the detection means and an out- put of the first gating means to produce a reset pulse after a sample period in the interval between each key pulse. A voltage generator is provided which is responsive to each reset pulse to provide a predetermined output level and responsive to each key pulse to ramp that output level at a predetermined rate for the duration of that key pulse so the output level of the generator during each sample period is a predetermined function of the rotational speed. The output level of this voltage gen- erator is adapted to modify a reference voltage in a circuit for controlling the speed of the motor which includes a con- trolled solid state switch in series with the motor so that power is supplied as a pulse when the switch is turned on. The proportion of time for which the switch is turned on being response to the reference voltage.
277044
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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