Invention Grant
- Patent Title: Elevator control device with carrier frequency switch circuit
- Patent Title (中): 电梯控制装置带载频开关电路
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Application No.: US12877110Application Date: 2010-09-08
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Publication No.: US08348020B2Publication Date: 2013-01-08
- Inventor: Hiroaki Ohya , Masashiro Tanaka , Yoichi Yamamoto
- Applicant: Hiroaki Ohya , Masashiro Tanaka , Yoichi Yamamoto
- Applicant Address: JP Kitakyushu-Shi
- Assignee: Kabushiki Kaisha Yaskawa Denki
- Current Assignee: Kabushiki Kaisha Yaskawa Denki
- Current Assignee Address: JP Kitakyushu-Shi
- Agency: Ditthavong Mori & Steiner, P.C.
- Priority: JP2009-206603 20090908
- Main IPC: B66B1/06
- IPC: B66B1/06

Abstract:
An elevator control device includes a vector controller that calculates a voltage command required for driving an elevator cage, a carrier frequency switch circuit that outputs a carrier frequency signal, and a power converter that performs PWM control based on the voltage command and the carrier frequency signal, generates an AC power and supplies the AC power to an AC motor. The carrier frequency switch circuit changes the carrier frequency signal when a torque command for driving the AC motor reaches a torque limit value. Thus, it is possible to continuously operate an elevator without causing damage to a switching element of the power converter.
Public/Granted literature
- US20110056771A1 ELEVATOR CONTROL DEVICE Public/Granted day:2011-03-10
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