Motor starting apparatus for an engine driven generator

Details Motor starting apparatus for an engine driven generator Motor starting apparatus for an engine driven generator

1998-08-26

2000-09-12

Martin, David

Electricity: motive power systems

Generator-fed motor systems having generator control

Automatic generator control and/or with time-delay means

318478, 322 10, 322 13, 322 46, 290 46, H02P 520

Patent

active

061182389

ABSTRACT:
A conventional motor controlling circuit is adapted to control an inverter that drives a permanent magnet generator as a motor to spin an engine to a speed sufficient to permit the engine to start. The commutation frequency is adjusted as a function of speed utilizing an automatic commutation frequency adjustment circuit. This circuit has multiple commutation frequency ranges that overcome a large initial bearing drag during low speed operation while still permitting high speed operation. The automatic commutation frequency adjustment circuit preferably generates first and second voltage ramps that overcome the initial bearing drag and accelerate the generator at a rate fast enough for sufficient back EMF to be generated for a closed-loop commutation phase. A speedup circuit operates during the closed-loop commutation phase to achieve the high speeds typically necessary for engine starting. The inventive circuits even permit a turbine type engine to be successfully started.

REFERENCES:
patent: 5015941 (1991-05-01), Dhyanchand
patent: 5068590 (1991-11-01), Glennon et al.
patent: 5140245 (1992-08-01), Stacey
patent: 5281905 (1994-01-01), Dhyanchand et al.
patent: 5495163 (1996-02-01), Rozman et al.
patent: 5747971 (1998-05-01), Rozman et al.
patent: 5942818 (1999-08-01), Satoh et al.

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