Nowadays in China all walks of life and all types of machinery and electrical equipment "Blower Fan" supporting the motor about 60% of the installed capacity of the motor, the power consumption of about one third of total electricity generation. It is particularly worth mentioning is that the majority of fans in the course there is big horse car phenomenon, coupled with the due to changes in production, technology and other aspects, often need to adjust the gas flow, pressure, temperature and the like; now, many units still use backward adjustment plate or windshield way valve opening degree to regulate the gas flow, pressure, temperature and the like. This is actually the way by artificially increasing the resistance, and a waste of energy and money to meet the cost of the process and conditions of the gas flow regulator requirements. This backward adjustment method, not only a waste of valuable energy and regulation accuracy is poor, difficult to meet modern industrial production and service requirements, very serious negative effects.