Reeling adopts constant torque control of the torque motor and the printing pressure roller and the discharging traction pressure roller adopt pneumatic component control.

Using the incremental fuzzy control with self-adapting parameter, the phase current of the switch reluctance motor was optimized, and the constant torque control is implemented.

In this paper, three elevators for the design of objects, combined with Sanken VM06 series of high-performance constant torque converter, developed a two-speed exchange of PLC elevator control system.