Propulsion and electric braking system for electric traction mot

Details Propulsion and electric braking system for electric traction mot Propulsion and electric braking system for electric traction mot

1991-04-30

1994-06-21

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Dynamic braking

318152, 388801, 3889072, 388917, H02P 314

Patent

active

053230957

ABSTRACT:
A system and method for controlling power transfer between an internal combustion driven electrical power generator and a direct current (DC) motor. In one form, the invention includes control of a power inverter in a manner to restrict current through a winding of the generator to a predetermined polarity. The inverter includes a plurality of gate controlled switching devices which are selectively energized to allow current to free wheel through the motor during at least some portion of each alternating voltage cycle of the generator. In another form, a plurality of resistors are connected in series with an inverter and a DC motor with each resistor including a switching device for bypassing current around the associated resistor. In this form, resistors can be selectively inserted into the series path during electrical braking so that a maximum amount of electrical energy can be transferred to the generator through the inverter without exceeding the voltage limits of the inverter during high speed braking. Regenerative braking is further maximized during low speed or reduced braking requirements by removing resistors from the series current path.

REFERENCES:
patent: 3569811 (1969-04-01), Miller et al.
patent: 4044285 (1977-08-01), Plunkett et al.
patent: 4088934 (1978-05-01), D'Altre et al.
patent: 4093900 (1978-06-01), Plunkett
patent: 4292531 (1981-08-01), Williamson
patent: 4495449 (1985-01-01), Black et al.
patent: 4761600 (1988-08-01), D'Atre et al.

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