(1) small inertia DC servo motor
Small inertia straight Shen servo motor is named because of the small rotational inertia. This type of motor is generally water magnetic type, armature winding has no phase armature type, printing armature type and hollow cup armature type three. Because the small inertia DC motor minimizes the rotational inertia of the armature. So it can get the fastest response speed. In the early CNC machine tools. This type of servo motor is used more. Small pension see servo motor in some countries on the CNC machine tools are still in use. Such as France.

(2) DC torque motor
Also known as large inertia wide speed DC servo motor. On the one hand, due to its larger rotor diameter. The number of turns of the coil winding increases. Large torque. Rotating rice bowl is larger than other types of motors. And it can work for a long time at a large overload torque. Therefore, it can be directly connected to the screw without the need for an intermediate drive. On the other hand, because it has no excitation circuit losses, its external dimensions are smaller than other similar DC servo motors. It also has the outstanding feature of being able to run smoothly at lower speeds, down to 1r/min or even 0.1r/min. This servo motor is widely used in CNC machine tools.

(3) Brushless DC servo motor

This servo motor is also called no rectifier motor. It has no commutator. Composed of synchronous motor and inverter, the inverter is controlled by the rotor position sensor mounted on the rotor. It is essentially a kind of AC speed control motor, because its speed control performance can reach the level of DC servo generator. It also eliminates the commutator and brush parts, which greatly improves the service life of the motor.

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