Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1986-11-04
1988-04-26
Levy, Stuart S.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
187 27, 187115, 188171, 254362, B66D 508
Patent
active
047399694
ABSTRACT:
A lift sheave arrangement is disclosed which includes a static shaft and a sheave mounted for rotation about the static shaft. The sheave has a first portion for receiving a cable which is to be connected to a lift car and a second portion which includes a brake on its inner circumference. A motor, the brake and second portion for driving the sheave about the static shaft are arranged in the same plane normal to the shaft. The motor has a plurality of movable magnets and a plurality of stationary magnets. The brake drum of the brake includes part of the magnetic circuit between adjacent magnetic elements in the movable magnetic elements.
A magnetic actuator is arranged for allowing movement of the brake to apply the brakes and a sensor is provided for sensing the magnetic flux in the actuator when the actuator is actuated to move the brake so that a control circuit can vary the voltage applied to the actuator to enable the brake to move smoothly under the influence of the actuator. The sheave arrangement also includes a sensor for sensing the load on the brake when the brake is holding the sheave stationary so that the motor can be pre-excited in accordance with the load sensed by the sensing means to enable the car to move smoothly when the brake is released.
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Eckersley Gregory
Jones Maxwell T.
Johns Perry Industries Pty. Ltd.
Levy Stuart S.
Matecki Katherine
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