Since the 1980s, the requirements of energy saving, consumption reduction and emission reduction have entered the agenda. In order to achieve this purpose, it is useful to change the frequency, voltage and speed of the motor, and also use hydraulic transmission to change the speed of the working machine. Energy conservation. The electrical control methods are: cascade thyristor, winding motors, such as DC motors, variable frequency motors, and frequency converters to change the speed of the motor. The mechanical transmission methods include: YOTC series speed-regulating hydraulic coupling, liquid-viscous speed governor, CST soft start, and magnetic coupling.
DY electro-hydraulic coupling device