Abstract: A motor system includes a motor having a rotor with a plurality of magnetic poles disposed adjacent a plurality of stator elements. Motion of the rotor is responsive to a change in magnetic flux from the stator elements. A generator comprising one or more coils and/or pickups is configured to generate electromagnetic signals responsive to the motion of the rotor, the change in flux from the stator elements, or both. A controller is configured to generate power from the signals, for operating a processor with memory. The processor and memory are configured to receive the signals, determine a count of cycles and/or direction changes of the motor based on the signals, and store the count in the memory.

Abstract: A compact, axially aligned brushless servo motor actuation unit configured to manipulate a choke valve to control the pressure within a borehole during managed pressure drilling. The actuation unit including a brushless servo, a gear reduction assembly and a planetary roller actuator substantially aligned along a longitudinal axis and housed within a tubular housing, the gear reduction assembly defining a hollow core sized to enable a portion of a roller screw of the planetary roller actuator to pass therethrough for the purpose of reducing the overall length of the actuation unit along the longitudinal axis.

Abstract: A compact, axially aligned brushless servo motor actuation unit configured to manipulate a choke valve to control the pressure within a borehole during managed pressure drilling. The actuation unit including a brushless servo, a gear reduction assembly and a planetary roller actuator substantially aligned along a longitudinal axis and housed within a tubular housing, the gear reduction assembly defining a hollow core sized to enable a portion of a roller screw of the planetary roller actuator to pass therethrough for the purpose of reducing the overall length of the actuation unit along the longitudinal axis.