Linear motor elevator having hybrid roping and stationary primary
AssigneeOtis Elevator Company
InventorsK. Narasimha Reddy, John K. Salmon
Life of this patent
Estimating the term…
Abstract
A linear motor elevator system includes a car mechanically coupled to a counterweight assembly such that the car roping ratio is less than the counterweight assembly roping ratio. A primary element of the linear motor is disposed on or within a hoistway wall associated with the secondary element of the linear motor. Alternatively, the primary element is affixed to a support frame of the elevator system. The counterweight assembly includes the motor secondary. The elevator system of the present invention reduces the volume within the hoistway interior occupied by the primary and secondary members of the linear motor.
Claims22
An elevator system, comprising:
- a car;
- a counterweight assembly including a motor secondary;
- a roping arrangement coupling said car to said counterweight assembly, said roping arrangement determining a car roping ratio and a counterweight assembly roping ratio, said car roping ratio being less than said counterweight assembly roping ratio so that a total travel distance of said counterweight assembly is less than a total travel distance of said car during normal operation of the elevator system;
- guide rails, said counterweight assembly being mounted on said guide rails;
- a platform for a motor primary, said platform being attached to said guide rails;
- at least one wall associated with said counterweight assembly, said wall forming a recess which opens in a direction generally towards said counterweight assembly;
- and
- a motor primary mounted on said platform, at least portions of said platform and said motor primary being disposed in said recess, said motor secondary being spaced from said motor primary by a substantially constant air gap.
An elevator system, comprising:
- a car;
- a counterweight assembly including a motor secondary;
- a roping arrangement coupling said car to said counterweight assembly, said roping arrangement determining a car roping ratio and a counterweight assembly roping ratio, said car roping ratio being less than said counterweight assembly roping ratio so that a total travel distance of said counterweight assembly is less than a total travel distance of said car during normal operation of the elevator system;
- substantially vertical guide rails, said car, said counterweight assembly and said roping arrangement being mounted on said guide rails;
- and
- a motor primary fixed to and at least partially supported by at least two of said guide rails, said motor secondary being spaced from said motor primary by a substantially constant air gap.
An elevator system, comprising:
- a car;
- a linear motor having a primary and a secondary;
- a hybrid roping arrangement coupling said car to said secondary;
- and
- a frame, said car, said linear motor and said hybrid roping arrangement being mounted on said frame, and said primary being fixed to and being at least partially supported by said frame.
An arrangement, comprising:
- a wall which forms a first recess opening in a first direction and which forms a second recess opening in a second direction, said first direction being generally opposite said second direction;
- a first core of a magnetic material having first windings of an electrically conductive material disposed therein;
- a second core of a magnetic material having second windings of an electrically conductive material disposed therein;
- said first core and first windings being disposed within said first recess, said second core and second windings being disposed within said second recess.
Dependencies are inferred from the claim text.