Rotary encoders for use in petroleum machinery products

• Top Drive - Reluctance Encoder - Rotary drill pipe and drill motor and gear system are typically fitted with an encoder that feeds speed and position back into the drive.

• Top drive - photoelectric encoder

• Winch and cement pump truck

• Roller encoder

• Mud Pump - Multiple motors are used in the downhole of circulating mud, and the motor is speed controlled with an encoder to increase flow linearity.

• Pipeline - an absolute encoder for position control.