Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1994-09-30
1996-08-20
Ip, Paul
Electricity: motive power systems
Induction motor systems
Primary circuit control
318 99, 318432, 212285, H02P 700
Patent
active
055481981
ABSTRACT:
The disclosure involves a drive system having a control section, an adjustable frequency drive unit coupled to the control section, and first and second drive motors. The drive system is used with a material handling machine such as a light-duty crane on which any two of the hoist, bridge and trolley drives are rarely used simultaneously and in any event need not be used simultaneously. The drive unit is a scalar or flux vector (feedback-type) inverter and is the sole drive unit providing electrical power to the drive motors. Preferred control is by a pendant station or radio transmitter. Operating a pushbutton on the pendant station (or a paddle-like stick control on the transmitter) for a particular drive motor "locks out" operation of the other motors. Motors are operated on a first-come, first-served basis.
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Harnischfeger Corporation
Ip Paul
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