Soft torque control

　　The stick-slip vibration is a typical Nonlinear self-excited vibration, which is always met while drilling, and highly 40% probability. It is the main cause for drill pipes and strings damaged, drill bit worn, and it also make bit deviate its expected drilling direction, or damage well wall. The rotary speed of drill bit reach the max., and more vibration while stick-slip vibration.
　　Soft torque control is a effectively method to control stick-slip vibration, which is based on ground control technology of TDS drilling. Without adding any bottom equipments, its simple construction is assembled seamless with transformer PLC control system, and transformer is connected to soft torque controller through CAN cable, then transformer feedback current rotary speed and torque of motor to soft torque controller, which transfer instruction to transformer to control the drill pipes.