Energy storage method for load hoisting machinery

Details Energy storage method for load hoisting machinery Energy storage method for load hoisting machinery

2007-01-23

2007-01-23

Salata, Jonathan (Department: 2837)

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

C187S296000

Reexamination Certificate

active

10773484

ABSTRACT:
A method for energy storage and recovery for load hoisting equipment powered by an induction hoist motor controlled by a first inverter and having a dual inverter controlling a capacitor utilizing rest power such as reverse power generated from the motor when lowering a load, and unused power at small load or idle, to charge the capacitor whereby energy is stored in the capacitor and the system is reversed when a load is lifted and power is consumed whereby the capacitor is discharged to deliver power to the hoist motor.

REFERENCES:
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patent: 5058710 (1991-10-01), Iwasa
patent: 5285029 (1994-02-01), Araki
patent: 5712456 (1998-01-01), McCarthy et al.
patent: 5936375 (1999-08-01), Enoki
patent: 6435312 (2002-08-01), Tajima et al.
patent: 6732838 (2004-05-01), Okada et al.

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