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Basic principle of starting the water resistance cabinet
According to the mechanical equipment gear transmission, the water resistance cabinet makes the distance between the two parallel surface pole pieces in the conductive liquid gradually become smaller to zero, so that the resistance value of the rotor control circuit of the motor into the motor is smoothed, thereby achieving the tangled light load start. The motor starts smoothly. After the completion of the whole process, according to the closing and closing of the AC contactor 1, the water resistance cabinet is removed from the motor rotor control circuit, and the whole process of starting is performed. The technical application of the programming control board (PLC) makes it fully functional, wide-ranging, easy to use and easy to modify.
Characteristics and principles of entering the camera
China's common camera is divided into two types: turntable and stationary. The stationary moving camera adopts a microcomputer to manipulate the principle of the thyristor communication AC frequency converter, and has the functions of self-diagnosis and self-repair, and has a low repair rate and a long service life. The principle is as follows: according to the current quantity change of the rotor control loop of the motor motor, the data analysis system is carried out by the microcomputer control board, and the motor speed ratio change is automatically tracked, and the soft starter is operated to convert the 50 Hz AC current into asynchronous The motor's rotor current quantity frequency is the same electromotive force E, which is released to the motor rotor winding of the motor, and the additional working voltage is 90 degrees behind the motor rotor current. Exceeding the actual effect of the double-capacitor on the side of the motor motor rotor, the power factor of the motor is significantly enhanced (see Figure 1). The reactive power absorbed by the power grid is greatly reduced, and the stator current of the motor is greatly reduced. In turn, it exceeds the goal of fully automatic variable resistance, limiting the amount of starting current, and raising the starting torque. However, the frequency sensitive varistor has lower power factor, small starting torque, large starting impact current, difficult starting, and practical operation, and is not suitable for several starts. The reactive power compensation of the motor by the parallel capacitor bank of the high and low voltage distribution room of the production workshop is in fact equal to the compensation of the reactive power of the motor on the power grid other than the motor, and the operation of the motor itself cannot be improved. Therefore, when the motor is working, the stator side current and the motor temperature are very high, while the power factor, high efficiency and load working ability are very low, which jeopardizes the service life of the motor and also disadvantages to save electromagnetic energy.
According to the left and right reasons, the water-resistant cabinet and the camera are used to update the current winding-type communication asynchronous motor starting operation method.