The governor is used to reduce the irregular speed fluctuations of some machines automatically adjust the device. It can keep the machine speed constant or close to the set value. Turbines, steam turbines, gas turbines, and internal combustion engines are different from motors, and their output torque does not automatically adapt to their own load changes, so when the load changes, the units driven by them will lose their stability. This type of unit must set the governor, so that it can with the load and other conditions change, at any time to establish the load and energy supply of the relationship between the adaptation to ensure the normal operation of the unit. The theoretical and design problems of the governor are the research contents of mechanical dynamics. There are many kinds of governors. One of the most widely used is mechanical centrifugal speed governor. And the speed-measuring generator or other electronic devices as sensors of the governor, has been widely used in various industrial sectors.