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公开(公告)号：US09793781B2
公开(公告)日：2017-10-17
申请号：US14615131
申请日：2015-02-05
发明人： Charles Patrick , Kevin Williams
摘要： An electric motor having internal closed loop cooling includes a cooling chamber coupled to the stator cover of the electric motor. A fan is positioned to circulate air through the interior of the electric motor and the cooling chamber. A heat sink in the cooling chamber removes heat from the circulating air. The heat sink may be coupled to a fluid cooling jacket to transfer heat thereto or therefrom.
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公开(公告)号：US09919903B2
公开(公告)日：2018-03-20
申请号：US14656370
申请日：2015-03-12
发明人： Charles Patrick , Kevin R. Williams
CPC分类号： B66D1/12 , B66D1/485 , H02P25/184 , H02P25/188 , H02P27/047 , H02P2207/01
摘要： 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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