Method of controlling V/F inverter for machines having mechanical braking systems
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United States of America Patent
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-
Sep 17, 1991
Issued Date -
N/A
app pub date -
May 2, 1989
filing date -
Apr 10, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is disclosed a method of controlling a voltage-to-frequency inverter which controls an induction motor by the use of an open-loop system. The motor drives a machine such as a crane, and is braked by a mechanical brake. When the machine is started or stopped, a low-frequency voltage is supplied to the motor so that the motor may produce a torque necessary to hold the load, until the actuation of the mechanical brake ends completely.
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