Three phase a.c. motor drive system

Details Three phase a.c. motor drive system Three phase a.c. motor drive system

1975-11-03

1977-09-27

Rubinson, Gene Z.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318230, 318231, 318269, 363 56, H02P 540

Patent

active

040514188

ABSTRACT:
A system for controlling the speed, torque and power of three phase a.c. motor. A binary logic circuit generates a variable frequency three phase signal which controls three driver pairs in an inverter to selectively apply either the positive voltage or the negative voltage of a direct current power source to each of the three motor phases. The three phase binary driver control signal is pulse frequency modulated below 60 cycles per second to operate the motor in a constant torque mode without varying the rectifier output voltage. The logic control signal also includes a delay to protect the drivers by assuring that one driver of a pair is "off" prior to turning the other driver "on". In addition the system comprises high response voltage and current limiting circuits to protect the system and to reduce the overcapacity requirement of the components. An accelerator/decelerator circuit achieves a nearly linear characteristic through the use of switching transistors to permit substantial cost savings.

REFERENCES:
patent: 3538420 (1970-11-01), Klein
patent: 3700989 (1972-10-01), Jensen
patent: 3775651 (1973-11-01), Graf et al.
patent: 3878445 (1975-04-01), Kirkham et al.
patent: 3893006 (1975-07-01), Algeri et al.
patent: 3947736 (1976-03-01), Byers
patent: 3947748 (1976-03-01), Klein
patent: 3967173 (1976-06-01), Stich

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