Method for consuming regenerated power for elevators

Details Method for consuming regenerated power for elevators Method for consuming regenerated power for elevators

1992-12-02

1995-05-30

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

318812, 318376, H02P 124

Patent

active

054204917

ABSTRACT:
An analog DC link bus voltage in an induction motor drive is converted to a digital DC link bus voltage so that if the DC link bus voltage exceeds an ON voltage threshold of a switch and this condition exists a holding time later, the switch closes, thereby allowing regenerated power in the DC link to be dissipated in a resistor connected across the DC link. And if the DC link bus voltage falls below an OFF voltage threshold and that condition exists a latching time later, the switch is opened so that no regenerated power may be dissipated through the resistor.

REFERENCES:
patent: 4695938 (1987-09-01), Tada
patent: 4788493 (1988-11-01), Liptak
patent: 4933828 (1990-06-01), Ogawa et al.
patent: 5089760 (1992-02-01), Joyner, Jr.
patent: 5194797 (1993-03-01), Kahkipuro
patent: 5204606 (1993-04-01), Kuwahara et al.
patent: 5208524 (1993-05-01), Kono et al.

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