Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1975-01-09
1977-02-15
Dobeck, B.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318313, 318327, 318254, H02P 506
Patent
active
040084256
ABSTRACT:
The rotation of a motor is sensed and a signal indicative of any error in desired motor speed or phase is multiplied by the angular position of the motor shaft. The resulting product defines a sinusoidal drive signal which is amplified and introduced to the motor windings. As the error signal varies, the sinusoidal drive signal amplitude varies therewith to slow down or speed up the motor accordingly. Thus the invention provides both drive and servo control to a motor from a multiplier device disposed within the servo circuit. The multiplication process provides the ideal drive signal since the motor windings are driven with continuously varying drive signals, which provides accordingly a constant motor torque output inherently free from velocity variations.
REFERENCES:
patent: R28567 (1975-10-01), Matthey et al.
patent: 3375422 (1968-03-01), Boudigues
patent: 3740629 (1973-06-01), Kohlhagen
patent: 3829747 (1974-08-01), Woolfson et al.
patent: 3831073 (1974-08-01), Tanikoshi
patent: 3849709 (1974-11-01), Berman et al.
patent: 3906320 (1975-09-01), Doemen
patent: 3942084 (1976-03-01), Louth
Ampex Corporation
Dobeck B.
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