Dragline excavating machine with direct drive hoist and drag...

Details Dragline excavating machine with direct drive hoist and drag... Dragline excavating machine with direct drive hoist and drag...

2006-04-11

2006-04-11

Beach, Thomas A (Department: 3671)

Excavating

Cable-operated

Boom-type

C037S401000, C701S050000, C318S803000

Reexamination Certificate

active

07024805

ABSTRACT:
A dragline excavating machine includes a gearless direct drive AC drive motor for driving each of the hoist and the drag drums in the system. The gearless AC motor is driven using a digital system which receives AC power from the utility system rectifies the power using active front end circuits, and converts the resultant DC to a frequency controlled AC using an inverter circuit. The resultant AC signal is employed to drive the gearless AC motor, resulting in reduced harmonic distortion, unity or leading power factor, and increased efficiency, reduced operating costs, and reduced mean time between failure.

REFERENCES:
patent: 4174579 (1979-11-01), Learmont
patent: 4368521 (1983-01-01), Sholes, II
patent: 4787021 (1988-11-01), Hokari et al.
patent: 5963020 (1999-10-01), Orr
G.M. Brown, et al., Increased Productivity of AC Drives for Mining Excavators and Haul Trucks, pp. 1-10, Oct. 9, 2000.
W. Koellner, et al., “AC Drive System with Active Front End (AFE) for Mining Excavators,” pp. 1-9, May 1, 2001.
Siemens, Active Front End—Simovert Masterdrives, pp. 1-10, Sep., 1997.
Siemens, A New Generation of Gearless Drives for the Ore Industry, Solutions for Metals, Mining, and More, pp. 1-18, Mar., 1997.

Affiliated with

Also associated with

Rating

Dragline excavating machine with direct drive hoist and drag... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dragline excavating machine with direct drive hoist and drag..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dragline excavating machine with direct drive hoist and drag... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3560117