Electrical characteristics reflect in the motor start with load, if theproperty and mechanical transmission combination, can achieve the not puremechanical system to achieve the effect of. Application of the electrical design made of electromechanical two stage transmission, work without a joystick, speed is stepless speed, can change the direction of rotation.

Starting mode, starting time of the motor, the power matching, is one of the key factors in the design of. In the mechanical transmission, always follow the "low → high → deceleration and stop the cycle". And this process from"low → high speed" the time is not very long, starting with loadcharacteristics of the motor can achieve this point.

A gear speed electromechanical two automatic transmission is the use of thestarting character of the motor load. Motor to ratings from rest to speed, is the use of Y- reduced voltage starting to realize, a control circuit adopts atime delay relay, Y- △ automatic conversion with time, the control scaletime delay relay dial according to the calculated value of the tQpositioning. After the stator winding of the motor is connected in a delta connection method, and two automatic transmission into the two retainingspeed.

To sum up, the working process of electromechanical two automatic transmission: "static, gear speed, two speed, deceleration and stop". Among them, from a rotary speed to two speed automatic transformation process isblocked. The rest of the operation only needs to press the control button.Thus, compared with the mechanical transmission simple mechanical and electrical level two automatic transmission, the mechanical drive system,saves the joystick system, remove the gear transmission mechanism, largenoise is reduced, without lubricant, the working environment is friendly.