Product features: 
◎ The performance of HF650LC series in open-loop vector control has reached the international advanced level, which is able to control the motor at zero speed to output up to 200% of the rated torque of the motor, torque output consistency and high precision;
◎ Customizing synchronous control algorithm has developed for shield cutterhead system, it can quickly respond to the fluctuations of the cutter load, and ensure that the torque and current imbalance of each cutter motor is controlled at less than 2% of the rated value, that can adapt to a variety of complex geological conditions;
◎ High precision of internal torque limiting, which can accurately limit the output torque when the load increases sharply, avoiding the disconnection of the motor output shaft and cutterhead, and providing a stable operation for the mechanical system;
◎ The product has novel and advanced design solution, which take advantages of high power density, strong ability of detrapping , and good synchronous control performance of motors.