Fine adjustment system of simple position sensor

The utility model discloses a fine adjustment system of a simple position sensor. The system is characterized in that a rotary transformer is arranged to be served as a motor rotor position sensor of a motor; a rotary variable rotor of the rotary transformer is detachably installed on a rear end of the motor rotor through a screw; a rotary variable stator of the rotary transformer is fixedly installed on a rear end cover of the motor through the screw; each phase line of a motor controller with a decoding chip is correspondingly connected with each phase line of the motor; a position signal input terminal of the motor controller is connected with a position signal output terminal of the rotary transformer; the motor controller communicates with a master control computer through a communication interface; a calibration shift fork possesses a rotatable declutch shift shaft; a shift fork head fixedly connected on a front end of the declutch shift shaft is used to toggle the rotary variable rotor so that the rotary variable rotor rotates with the shift fork head. By using the system of the utility model, position consistency of the rotary transformer installed on the motor rotor is guaranteed so that a control effect of the motor controller to the motor is guaranteed to be consistent, which is good for industrialization production.