Due to adopt direct drive method,permanent-magnet ring torque motor rotary feeding system used in NC rotary table is more sensitive to load disturbances and parameters variations,which greatly reduces servo performances of the system.

The servo performances of ring permanent magnet torque motor servo system used in direct drive numerical control(NC) rotary table are seriously effected by load disturbances and parameters uncertainties.

The compound A/C axe direct drive ring permanent magnet torque motor servo system in high precision five axes gang numerical control machine is easily affected by the load disturbance and parameter variation,and rapid tracking performance and precision are influenced by the coupling between machine and electric variables.

For the characteristics of compound A/C axe direct drive permanent magnet ring torque motor servo system in high precision five axes module numerical control machine being influenced by varying of load and variables,the second order sliding mode speed controller is proposed.

In order to enhance motor torque density to meet the requirements of NC machine tools limited operating space, a novel dual-rotor permanent magnet ring torque motor for NC rotary table is researched.

Torque optimization of direct drive torque motor for machine rotary table;

The Research of the Direct Drive Torque Motor and Its Controller for Machine s Rotary Table;

According to a certain type of DC torque motor, a PWM drive card was designed.

This paper introduced a method of dynamic imitation in which a moment motor is regarded as a unit of steering wheel opposite rotary moment,and analyses stable state error of the control system.

Structure Design of Multiple Axes Rotary Spindle Head Drived by Torque Motors;

The characteristic of angular displacement was one of the main characteristics of the torque motor.