Multiple speed control means for a variable speed motor system

Details Multiple speed control means for a variable speed motor system Multiple speed control means for a variable speed motor system

1980-06-10

1983-02-15

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318305, 318742, H02P 540

Patent

active

043743536

ABSTRACT:
A multiple speed control means for a variable speed motor system used for driving a hoist including multiple fixed speeds and a low speed range which is incrementally variable throughout the range. The control means provides distinct voltage levels which correspond to fixed motor speeds, the highest voltage corresponding to the maximum or full speed of the motor. Manual switch means switch into these fixed speeds or into the variable low speed range when the system is either in the hoist or lowering mode for respectively lifting or lowering a load in place.
A quick response circuit is connected into the system for a predetermined time duration after the system is switched into any of the speed positions except the maximum speed position.

REFERENCES:
patent: 2409264 (1946-10-01), Feldhausen
patent: 3078406 (1963-02-01), Zweifel et al.
patent: 3596156 (1971-07-01), Davey
patent: 3772579 (1973-11-01), Stone et al.
patent: 3943420 (1976-03-01), Hind
patent: 3962615 (1976-06-01), Spangler

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