News

AC servo motor and DC servo motor are two types of main servo motors in modern industry. we are facing different names, like servo electric motor, brushless servo motor, high torque servo motor, industrial servo motor, CNC servo motor, robot servo motor, servo motor for the robotic arm, high-speed servo motor, Servomotors, do you know how to distinguish these names? do you know the main differences between AC and DC servo motors? In this article, we will discuss the advantages and disadvantages of AC servo motors and DC servo motors. 

AC servo motor

In an AC servo motor, alternating current (AC) operates in reverse order. Every second, the current alternates countless times. AC servo motors can handle varying voltages more easily than DC servo motors.

1. Types of AC servo motor

AC servo motors include an encoder that is used by the controller to provide feedback and closed-loop control. AC motors can be positioned with high precision and controlled precisely as required. Also, AC servo motors can have 2-phase and 3-phase AC servo motors two types. two-phase or three-phase squirrel cage induction motor is used is known as an AC servo motor.

The two main types of AC servo motors are synchronous motors and induction motors.

The Induction AC motor belongs to an asynchronous motor, The Induction AC motor's speed is related to the frequency of the corresponding current. It is the most widely used application.

Synchronous AC servo motors use permanent magnets and produce rated torque at precise synchronous speeds. Synchronous AC motors can be used in drill machines, CNC machines, woodworking tools, and other high-precision machine.

2. Application of AC servo motor

You can see AC servo motors in CNC equipment, speed controllers, robotics(also called robot servo motor, servo motor for robotic arm), automation, water heaters, pumps, ovens, lawnmowers, air conditioners, and other applications.

DC servo motor

1. Types of DC servo motor:

Current flows in the same direction, we called it a DC servo motor. DC servo motors consist of a small DC motor, a position-sensing device and feedback circuit, a gear system, and a control circuit. For DC servo motors, current control is much simpler than for AC servo motors.DC servo motors have 2 kinds: brushed servo motors and brushless servo motors. 

Brushed DC servo motor feature: large starting torque, wide speed range, easy control, low cost, simple structure, requires maintenance (replacement of carbon brushes), will generate electromagnetic interference, and has requirements for the environment. The life of these brushes can be extended with regular maintenance.

Brushless DC servo motor feature:  the motor is fast in response, high in speed, small in inertia, stable in torque, small in size, light in weight, large in output, easy to be intelligent, and its electronic commutation method is flexible. The motor is maintenance-free and has no loss of carbon brushes. It has high efficiency, low operating temperature, low noise, low electromagnetic radiation, and long life. It can be used in various environments.

2. Application of DC servo motor:

No matter Brushless DC servo motor or Brushed DC servo motor. the DC servo motors are often used in precise control but without connection to an AC power source. For example: robotic arms, industrial automation equipment, printers, AGV wheels, indexers, etc.

In this article, we discussed all the comparisons of  AC servomotors and DC servomotors. Sure, RicoCNC can supply a wide range of AC and DC servo motors. from small power to big power, from different servo motor manufacturers, like Schneider, Mitsubishi, Panasonic, SANYO DENKI, YASKAWA, or other brands, welcome you to email us to discuss more information about servo motors together.