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US 5,400,204 AGranted
System for detecting a breakage of a power cable for an elevator system
AssigneeOtis Elevator Company
InventorsKenji Oshima, Manabu Suganuma
Life of this patent
Estimating the term…
Abstract
System For Detecting A Breakage Of A Power Cable For An Elevator System Which can accurately detect the breakage of at least one copper wire in the respective power cables present between the inverter of the elevator system and a linear motor moving element and which is difficult to visually inspect.
Claims15
An elevator system having an arrangement for detecting a breakage of a power cable, comprising:
- a car coupled to a driving means for driving said car;
- an inverter;
- at least one power cable consisting essentially of a plurality of wires connected between said inverter and said driving means, the driving means including a cylindrical linear motor electrically connected to said at least one power cable;
- a first means, installed on said power cable at a point which is distanced physically closer to said inverter measured along said power cable than to said driving means, for determining whether at least one of said plurality of wires constituting said cable is broken;
- and
- a second means for electrically disconnecting said power cable from said inverter to said cylindrical linear motor when said first means determines that said wire is broken.
3 more elements
An elevator system with motor protection, comprising:
- a car;
- a linear motor connected to said car so that said car is movable in response to a movement of said liner motor;
- an inverter;
- a cable electrically connecting said linear motor to said inverter, said cable including a plurality of wires;
- means for detecting a break in any one of said wires, said detecting means including a solid-state temperature sensor mounted on said cable at a point which is distanced physically closer to said inverter measured along said power cable than to said linear motor, a comparator having first and second inputs and an output, said first input being connected to said temperature sensor, said second input being connected to a constant voltage source corresponding to an output voltage of said temperature sensor when none of said plurality of wires is broken;
- and
- means for electrically disconnecting said cable from said inverter when said detecting means detects a break in one of said wires, said electrically disconnecting means being electrically coupled to said output of said comparator.
4 more elements
An elevator system with motor protection, comprising:
- a car;
- a linear motor connected to said car;
- an inverter;
- a cable electrically connecting said linear motor to said inverter, said cable having a plurality of wires;
- means for detecting a break in any one of said wires, said detecting means including a switch box connected to said cable, a signal transceiver, a number of transmission lines connecting said signal transceiver to said switch box, said number of transmission lines being equal to said plurality of wires, a microprocessor, electrically connected to said transceiver and to said switch box, for causing said signal transceiver to transmit a predetermined signal to any one of said wires and to receive signals from said remaining wires, and for causing said microprocessor to output a breakage detection signal if said signal transceiver fails to receive a signal corresponding to said predetermined signal from each of said remaining wires;
- and
- means for electrically disconnecting said cable from said inverter in response to said breakage detection signal.
4 more elements
Dependencies are inferred from the claim text.