公开(公告)号：US10680538B2

公开(公告)日：2020-06-09

申请号：US15718607

申请日：2017-09-28

Applicant: Otis Elevator Company

Inventor： Prasanna Nagarajan ,  Shashank Krishnamurthy ,  Konda Reddy Chevva

IPC: H02P3/22 ,  H02P3/26 ,  H02P3/14 ,  B66B1/32 ,  H02P3/04 ,  H02P3/02 ,  H02P6/24 ,  H02P3/16

Abstract: A system includes a converter operatively connected to an alternating current (AC) power source and a direct current (DC) bus, an inverter operatively connected to a motor and the DC bus, and a controller. The converter includes a first plurality of switching devices in selective communication with each phase of the AC power source and the DC bus. The inverter includes a second plurality of switching devices in selective communication with each phase of the motor and the DC bus. The controller is operable to command dropping of a brake through a passive delay circuit responsive to an emergency stop condition for a load driven by the motor and reduce a voltage on the DC bus by dropping at least one phase of the AC power source and/or using a dynamic braking resistor prior to the brake physically dropping.

公开(公告)号：US20180273343A1

公开(公告)日：2018-09-27

申请号：US15924687

申请日：2018-03-19

Applicant: Otis Elevator Company

Inventor： Edward Piedra ,  Randy Roberts ,  David Ginsberg ,  Ronnie E. Thebeau ,  Konda Reddy Chevva ,  XiaoBin Tang

IPC: B66B1/30 ,  B66B1/28 ,  B66B1/34 ,  B66B9/00 ,  B66B1/44 ,  B66B5/00 ,  G05B15/02

CPC classification number: B66B1/30 ,  B66B1/28 ,  B66B1/3476 ,  B66B1/3492 ,  B66B1/44 ,  B66B5/0018 ,  B66B9/00 ,  B66B2201/00 ,  G05B15/02 ,  G05B2219/41232

Abstract: Methods and systems of controlling elevators including detecting a landing stop for an elevator car, measuring load information associated with the stop, controlling stopping of the elevator at the landing using a machine based on at least one of the detected landing and the measured load information and performing dynamic compensation control of a motion state of the elevator with a computing system and the elevator machine. The dynamic compensation control includes receiving motion state information related to at least one motion state of the elevator car at the computing system, receiving the landing and load information at the computing system, applying a filter to the received information and generating a first control signal, and producing a control output from the first control signal to control the elevator machine to minimize oscillations, vibrations, excessive position deflections, and/or bounce of the elevator car at the detected landing.