Importance

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Abstract

A rig system with a drawworks motor and a drawworks motor useful in systems for wellbore operations, the system in certain aspects including a rig, a derrick on the rig, a drawworks, the drawworks motor for powering the drawworks, the motor including a motor shaft, a plurality of power cables for providing electrical power to the motor, a portion of each of the plurality of power cables passing through the shaft, and a plurality of channels passing through the shaft adjacent the power cables and spaced-apart therefrom, the channels for the passage therethrough of a heat exchange fluid for the exchange of heat with the power cables to maintain the power cables at a desired temperature.

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First Claim