Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1987-01-13
1987-10-27
Dobeck, Benjamin
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
318602, 318681, 361 23, G05B 902
Patent
active
047032383
ABSTRACT:
An amplifier system for energizing a d.c. motor from a power source in response to an error signal includes a bridge circuit including a first switching transistor pair for supplying a first current from the power source through the motor in one direction and a second switching transistor pair for supplying a second current from the power source through the motor in the opposite direction. A zero crossing detector determines the sign of the error signal and enables the first transistor pair when the error is positive and enables the second transistor pair when the error is negative. A current sensing resistor senses the first and second currents through the motor and provides a motor current signal representative thereof. An absolute value circuit provides an absolute value error signal representative of the magnitude of the error signal. A comparator means compares the motor current signal with the absolute value error signal and inhibits both the first and second transistor pairs when the motor current signal exceeds the absolute value error signal, thereby deenergizing the motor.
REFERENCES:
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patent: 4146801 (1979-03-01), Vali et al.
patent: 4189732 (1980-02-01), Atwater
patent: 4463296 (1984-07-01), Tada et al.
patent: 4481452 (1984-11-01), Kitano et al.
patent: 4575666 (1986-03-01), Nakashima et al.
Simyon Palmin, "Bipolar MOSFET Stepping Motor Drive Design," Power Conversion International, Oct. 1984, pp. 34-37.
"GL-1200 DC Motor Controller," Galil Motion Control, Inc., 3-1985.
Hewson Brian
Palmin Simyon
Design Components Incorporated
Dobeck Benjamin
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