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US 6,202,793 B1Granted
Elevator machine with counter-rotating rotors
OwnerRichard N. Fargoinventor
Life of this patent
Estimating the term…
Abstract
An elevator drive machine having two counter-rotating rotors provides a lightweight, efficient machine that eliminates reaction torque on surrounding structures by directing reaction forces and driving forces to the elevator car being lifted.
Claims8
A counter-rotating drive machine for an elevator system, said machine comprising
- a first rotor adapted to rotate about a central axis in a first rotational direction, said first rotor having an internal, generally cylindrical opening;
- a second rotor adapted to rotate, simultaneously with said first rotor, about said central axis in a second rotational direction which is opposite of said first direction, said second rotor being concentrically received within said generally cylindrical opening;
- a first drive sheave fixed to and adapted to rotate with said first rotor for delivering torque to an elevator drive rope;
- and
- a second drive sheave fixed to and adapted to rotate with said second rotor for delivering torque to an elevator drive rope.
2 more elements
A counter-rotating drive machine and counterweight assembly for an elevator system, said assembly comprising
- a counterweight body;
- a first rotor mounted to said counterweight body and adapted to rotate about a central axis in a first rotational direction, said first rotor having an internal, generally cylindrical opening;
- a second rotor mounted to said counterweight body and adapted to rotate, simultaneously with said first rotor, about said central axis in a second rotational direction which is opposite of said first direction, said second rotor being concentrically received within said generally cylindrical opening;
- a first drive sheave fixed to and adapted to rotate with said first rotor for delivering torque to an elevator drive rope;
- and
- a second drive sheave fixed to and adapted to rotate with said second rotor for delivering torque to an elevator drive rope.
3 more elements
Dependencies are inferred from the claim text.