Dual ring dedicated drive control system for medium voltage variable frequency drives
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United States of America Patent
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May 17, 2011
Grant Date -
Jul 16, 2009
app pub date -
Jan 14, 2008
filing date -
Jan 14, 2008
priority date (Note) -
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Abstract
The present invention provides a motor drive system that is substantially more robust than those of the prior art. Generally, the motor drive system provides a redundant communication topology with the drives, thereby greatly reducing the chance of failure by a fault in the drive-to-drive communication link. Specifically, the motor drive system includes a plurality of motor drives joined by a communication media. Each motor drive has a motor control circuit configured to control the speed of an electric motor and a media access control unit having two communication modules. Each communications module includes a transmitter and a receiver joined to the communications media. A set of routing switches in the media access control unit joins the communication modules to connect the motor drives in an independent primary and a secondary ring communicating data for controlling the motor drives.
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