Elevator motor control

Details Elevator motor control Elevator motor control

1989-08-02

1990-06-05

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318778, 318779, 318819, H02P 540

Patent

active

049320696

ABSTRACT:
An apparatus and method for automatic leveling of elevator cars by controlled DC plugging of AC induction motors. The invention utilizes, in a novel circuit and control arrangement, the external neutral connection of a Y-wound motor design to inject controlled direct current into the neutral to dynamically control the braking to a stop. The elevator car is thus more safely and accurately leveled at the desired floor than has heretofore been known in the art. A novel speed control method is also disclosed which compares and sums positive and negative DC signals and which switches to the motor braking mode at a desired time.

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