Cameron Rig Solutions, Inc.

Letourneau Technologies Drilling Systems, Inc.

Latourneau Technologies Drilling Systems, Inc.

Richard O Bradley

Kevin R Williams

Daniel F McNease

Rudy Harris

Alvie E Howard, Jr

Michael Netecke

A top drive system is provided. In one embodiment, a top drive includes a drive stem and a load nut with mating threaded surfaces that enable the drive stem to be threaded through the load nut and to support weight of a connected drill string via the load nut. One or both of the mating threaded surfaces may have a threadform with one or more undercut thread roots. Additionally, a portion of the mating threaded surfaces, such as thread roots of the drive stem, can be shot-peened. Additional systems, devices, and methods are also disclosed.

Top drive main shaft with threaded load nut

A low speed alternating current motor having motor shaft speeds of about 300 is provided, and such motor has application in numerous industries and devices, such as, for example, in top drive drilling systems. Because of the low shaft speed, mechanical speed reduction equipment may not be necessary. In addition, the motor shaft may be hollow to facilitate the flow of fluid, such as, for example, drilling mud.

Top drive drilling system and other applications using a low speed direct drive AC motor

Low speed AC motor for direct drive applications

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Cypress, TX, United States of America

Richard O Bradley