AC drive with optimized torque

Details AC drive with optimized torque AC drive with optimized torque

1991-05-01

1992-05-12

Ro, Bentsu

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318254, 318722, H02P 528

Patent

active

051131250

ABSTRACT:
Apparatus to extend the speed range and maximize torque of an ac drive by optimizing the torque angle as a function of speed. Using the back-emf of the machine, or the voltage from a permanent magnet generator mounted on the mtor shaft for reference, a novel analog biasing arrangement of a fast tracking multi-phase phase locked loop generates a set of stator current reference signals having a phase angle which is programmed to provide the optimum torque angle at any speed.

REFERENCES:
patent: 3784888 (1974-01-01), Geiersbach et al.
patent: 3908130 (1975-09-01), Lafuze
patent: 4223261 (1980-09-01), White
patent: 4489266 (1984-12-01), Franzolini
patent: 4651068 (1987-03-01), Meshkat-Razavi
patent: 4669024 (1987-05-01), Stacey
patent: 4672556 (1987-06-01), Shepler
patent: 4942344 (1990-07-01), Devitt et al.

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