Magnetic system for elevator car lateral suspension
AssigneeOtis Elevator Company
InventorRoy S. Colby
Life of this patent
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Abstract
An electromagnet actuator has an E-shaped core for coupling magnetic flux between the core and a blade of a hoistway rail. A pair of coils wound on the core provide the flux in such a way as to produce both side-to-side and front-to-back forces that can be controlled by varying the current to the pair of coils in each actuator on opposite sides of the car.
Claims12
An electromagnet actuator for actuating an elevator against a hoistway rail, comprising:
- an electromagnet core having an E-shape for coupling magnetic flux between the core and a blade of the rail;
- and
- a pair of coils wound on the core for providing the flux, wherein the E-shape of the core forms an E with outer arms having serifs.
An electromagnet actuator for actuating an elevator against a hoistway rail, comprising:
- an electromagnet core having an E-shape for coupling magnetic flux between the core and a blade of the rail;
- and
- a pair of coils wound on the core for providing the flux, wherein a distal end of an inside arm of the E-shaped core is for facing alignment with a distal end of the rail blade and wherein distal ends of a pair of outside arms of the E-shaped core are for facing alignment with opposite sides of the rail blade.
An elevator car horizontal suspension for suspending the car between opposite hoistway rails, comprising:
- a pair of electromagnet actuators having E-shaped cores and positioned on opposite sides of the car adjacent a corresponding pair of rails, each actuator responsive to a pair of coil current signals for providing flux in a pair of coils wound on opposite sides of the core for exerting front-to-back and side-to-side forces between the car and the rails;
- sensing means, responsive to movement of the car, for providing one or more sensed signals;
- and
- a control, responsive to the one or more sensed signals, for providing the pair of coil current signals to each actuator;
- wherein the control comprises:
- summing means, responsive to two translational reference signals and one rotational reference signal and responsive to corresponding sensed signals, for providing one or more corresponding difference signals;
- motion control gain means, responsive to the corresponding difference signals, providing force and moment command signals;
- first decoupling means, responsive to the force and moment command signals, for providing flux command signals;
- a flux control, responsive to the flux command signals and to sensed flux signals and to the translational and rotational sensed signals, for providing current command signals;
- second decoupling means, responsive to the current command signals, for providing coil current command signals;
- and
- drivers, responsive to the coil current command signals, for providing the pair of coil current signals for each actuator.
Dependencies are inferred from the claim text.