With the development of modern electrical technology and computer technology as well as the application of modern control theory, the electric automation driver is developing towards the direction of computer control process automation. In order to achieve high-quality and efficient production, in today's reality, automatic control has been widely distributed and developed to all areas of life, and the application of automatic speed regulation is particularly important. At present, motor control has developed from simple to complex, and has become the mainstream. Its application fields are not always very wide, such as radar antenna control, gun control, inertial navigation and so on. Control industrial equipment, such as CNC machine tools, industrial robots, printers, control printers, fax machines, copiers, scanners, computer peripherals, office supplies. Audio visual equipment and recorder control, washing machine, home appliance coding camera air conditioning control.<br>
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