The national pay more attention to transform manufacturing industry and develop high-end intelligence equipment at the industrial 4.0 era. Servo control system plays an important role as a direct executor in automation and high-end intelligence device. Permanent Magnet Synchronous motor (PMSM) with its advantages such as high efficiency, high air-gap magnetic density, high power factor, simple compact structure and linear response that has been widely applied in numerical CNC machine tools, robots, manned spacecraft, and variable frequency air-condition occasions.
In the servo control system whether can accurately obtain servo motor and encoder zero phase relationship, can effect if servo motor could be normal boot or not and wrong phase will make PMSM boot failure then make the rotor will be inversion and shake.
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