The traditional transformer coil winding is based on the requirements of the consumption process, depending on the manpower will be insulated wire winding on the workpiece, the operator stop counting resistance. Using the traditional winding method, not only the winding efficiency is low, the quality of waste coil is also poor. Automatic winding machines are widely used in transformer windings, which can significantly improve the consumption efficiency and wiring accuracy. In the automatic winding machine, there are large transformer winding vertical winding machine, but also winding lower voltage class and smaller capacitive transformer winding horizontal winding machine and foil winding machine. Automatic winding machine control features:
1 high efficiency, speed without additional loss;
2 wide range, suitable for cage induction motor;
3 Speed Range, features hard, high precision.
The speed of three-phase asynchronous motor is determined by the point frequency, the number of motor poles and slip rate. The torque of induction motor is produced by the interaction between the flux of motor and the overcurrent in rotor. At a fixed frequency, if the voltage is constant, only reduce the frequency, then the magnetic flux is too large, magnetic circuit saturation, the motor severely burned out. Therefore, frequency and voltage to be proportional to change, that is, change the frequency at the same time control the inverter output voltage, so that the motor flux to adhere to a certain degree, to prevent the phenomenon of magnetic flux and magnetic saturation. Because general frequency converter commonly uses V/F control, that is, variable voltage variable frequency speed, change the frequency and voltage to make the optimal motor control method.
