Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1975-06-09
1977-06-21
Rubinson, Gene Z.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318230, 318231, 318313, 318415, H02P 540
Patent
active
RE0292753
ABSTRACT:
A two-phase motor preferably of the induction or hysteresis type is driven from a variable frequency clock circuit by energizing the motor windings in phase quadrature over the frequency range. Speed control is provided by mechanically modulating a light emitting diode (LED) and photoresistor combination that couples to the clock circuit for determining its frequency of operation. The output of the clock circuit in turn couples to a two-phase generator that drives output bridges associated with the motor in phase quadrature. The photo resistor is characterized by a relatively [lone] low "off" (return to dark resistance) time constant that provides automatic braking when the speed control is set to zero. The system further includes a feedback circuit responsive to motor load fluctuations sensed by monitoring the DC current drawn by output bridge circuit means associated with the motor for controlling the frequency of operation of the clock circuit. This clock control permits the motor to come up to speed quite quickly with little or no synchronous slippage.
If a load which would ordinarily stall the motor at the speed indicated by the mechanical control is [the speed] placed on the motor the feedback circuit will slow the clock control so that the motor will run at a speed lower than the mechanically indicated speed rather than stall.
REFERENCES:
patent: 3374410 (1968-03-01), Cronquist et al.
patent: 3416057 (1968-12-01), Froyd et al.
patent: 3512067 (1970-05-01), Landau
patent: 3514685 (1970-05-01), Burgess
patent: 3518516 (1970-06-01), Pawletko
patent: 3593083 (1971-07-01), Blaschke
patent: 3700989 (1972-10-01), Jensen
patent: 3719873 (1973-03-01), Graf
Berman Herbert
Tenen Stanley N.
Cohen Jerry
Hieken Charles
Rubinson Gene Z.
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