Invention Grant
- Patent Title: Method for performing a manual drive in an elevator after mains power-off
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Application No.: US15971346Application Date: 2018-05-04
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Publication No.: US11008197B2Publication Date: 2021-05-18
- Inventor: Juhamatti Nikander , Ari Kattainen , Pasi Raassina
- Applicant: KONE Corporation
- Applicant Address: FI Helsinki
- Assignee: KONE Corporation
- Current Assignee: KONE Corporation
- Current Assignee Address: FI Helsinki
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: EP17172027 20170519
- Main IPC: B66B5/02
- IPC: B66B5/02 ; B66B1/32 ; B66B5/00 ; B66B1/30 ; B66B1/34 ; B66B5/04

Abstract:
In a method for performing a manual drive in an elevator after mains power-off, the frequency converter of the motor is separated from mains, any safety blocking of the brake drive and/or motor drive is disabled, current is supplied from the battery to the brake drive to open the elevator brake and current is supplied from the battery to the drive control to allow regulation of the motor speed via the inverter bridge, the manual drive control observes the motor speed via the speed sensor and starts a speed feedback loop to regulate the motor speed to a manual drive reference value by feeding a three phase-AC current to the motor windings via the semiconductors of the inverter bridge, which manual drive speed reference is lower than the speed reference for normal elevator operation, when the car reaches a floor level the floor level indicator is activated, and the actuator is released whereafter the current supply from the battery to the elevator brake is interrupted and the previous disabled safety blocking of the brake drive and/or motor drive is enabled again.
Public/Granted literature
- US20180334359A1 METHOD FOR PERFORMING A MANUAL DRIVE IN AN ELEVATOR AFTER MAINS POWER-OFF Public/Granted day:2018-11-22
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