Multi-speed electric motor
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United States of America Patent
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Mar 20, 2018
Grant Date -
Sep 17, 2015
app pub date -
Mar 12, 2015
filing date -
Mar 13, 2014
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Abstract
A multi-speed electric motor may include a plurality of windings arranged into winding phase groups. A speed controller may switch two or more windings between a series and a parallel configuration in each winding phase group. The speed controller may also switch the winding phase groups between a delta and a Wye configuration. By selecting a specific configuration, one or more of the holding torque, torque ratio, no-load maximum speed, and volts/Hz ratio of the AC motor may be optimized for a given application. In some embodiments, the AC motor may be used as part of a piece of drilling rig equipment such as a drawworks, winch, mud pump, top drive, or rotary table.
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