Double differential, electrically compensated constant speed dri

Details Double differential, electrically compensated constant speed dri Double differential, electrically compensated constant speed dri

1986-12-23

1988-03-29

Shoop, Jr., William M.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Running-speed control

318149, 318 12, 290 4R, 322 40, 322 12, 307 84, 307 87, H02P 116, H02P 1500

Patent

active

047346264

ABSTRACT:
An electrically compensated constant speed drive (ECCSD) according to the present invention includes a pair of power transmission paths between the prime mover and a load wherein each power transmission path includes a mechanical differential having a first input coupled to the output of the prime mover and an output coupled to the load. A second input of each of the differentials is coupled to a permanent magnet machine and a power converter interconnects the electrical power windings of the permanent magnet machines. In operation, one of the permanent magnet machines is always operated as a generator while the other permanent magnet is operated as a motor so that power flow through the power converter is unidirectional. The ECCSD of the present invention results in a substantial reduction in the maximum control power and hence efficiency is increased and complexity is reduced.

REFERENCES:
patent: 2735059 (1956-02-01), Schaelchlin
patent: 3468193 (1969-09-01), O'Mahony
patent: 3953775 (1976-04-01), Friend et al.
patent: 4354144 (1982-10-01), McCarthy
patent: 4354400 (1982-10-01), Baker
patent: 4525661 (1985-06-01), Mucsy et al.
patent: 4572961 (1986-02-01), Borger
patent: 4661762 (1987-04-01), Baker
Oil Hydraulic Power Transmission and Control, "A Double-Differential, Hydrostatic Constant-Speed Alternator Drive" by R. Westbury, Paper No. 5, Nov. 29 and 30, 1961.

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