Closed-loop transmission device for workpiece main shaft for grinding square optical elements interruptedly

The invention relates to a closed-loop transmission device for a workpiece main shaft for grinding square optical elements interruptedly. According to the closed-loop transmission device, a torque motor is connected with the main shaft; the A end of the main shaft is directly and fixedly connected with a motor rotor by a rotor connection plate, so that the motor rotor is coaxially connected with the main shaft; a motor stator is directly connected with a support by a connecting sleeve and is coaxial with the main shaft, so that the motor rotor is coaxial with the motor stator; the main shaft is provided with a circular grating to perform position feedback, and reading is performed in real time by a circular grating reading head arranged on a stator connection plate to perform closed-loop control, so that the high-precision and high-accuracy control of the transmission of the workpiece main shaft for grinding the square optical elements interruptedly at the circumference is ensured. The closed-loop transmissio