The real-time feedback signal is used to control the motor, which reduces the disturbance of human factors to the production process, improves the process control precision, improves the product quality and output, and reduces the energy consumption. With the use of AC variable frequency speed governor, the failure of electrical equipment is greatly reduced, and there has never been an abnormal shutdown accident caused by the thermal relay action or the air switch action caused by the large starting current and the process fluctuation. Especially when the power grid fluctuates and starts again, because it can start from the actual operating frequency of the motor at that time, the starting is smooth and the impact on the power grid is small. Before the use of AC variable frequency speed governor, restarting often causes thermal relay action or air switch action, resulting in an accident shutdown. Wide Range of fan speed regulation. Fan Motor operating frequency range of 35-45 H: , and frequency converter speed range of 10-50 Hz, fully meet the requirements of process production. The Motor starts without impact and runs smoothly. The starting current of the original AC actuating system has a great impact on the equipment. After the use of AC variable frequency governor, the motor starts from zero, and then gradually smooth speed up, thus reducing the impact on the equipment, so that the system equipment failure rate 6 conclusion AC variable frequency governor uses ZA, without any failure, greatly reduced equipment maintenance workload and maintenance costs. According to the current motor long-term operating frequency 40 Hz, AC frequency converter governor primary side power supply current 230-250 a calculation, compared with the original direct operation of the AC motor can save 35% of the electricity cost calculated by 0.48 yuan (kwh) , 1.5 A can recover all AC variable frequency speed governor costs. In particular, when the power grid fluctuates, it can start again successfully and the process can not stop, which ensures continuous production and eliminates a great deal of loss of fuel and materials caused by the accident stop, which makes its advantages more outstanding and the direct and indirect economic benefits are very obvious. The KTI time delay relay is usually set to the given signal of the instrument. The starting process of the fan driven by AC variable frequency speed governor requires smoothness,