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How to Choose Servo Motors?

By aoba | Published on Sep 16,2015

Today, in the era of electronic motion control, there are usually some complex motions that influence the dynamic loading of motors. As servo motors are the core of many electromechanical systems, it is especially important to know how to choose servo motors in different kinds of industrial tasks. In order to choose a suitable servo motor, we must have a better understanding of its load characteristic, working condition and motor characteristic. This article will introduce to you 4 different types of servo motors.

1. Brush servo motor: Brush servo motors have many advantages such as low price, simple construction, high starting torque and wide range of speed regulation. However, during the maintenance, electromagnetic interference may happen. Therefore, companies that have a strict control of costs usually tend to choose brush servo motors.

2. Brushless servo motor: Brushless servo motors are equipped with advantages such as small size, light weight, high output, quick torque response, fast speed, smooth rotation, etc, thus it’s easier for brushless motors to work intelligently. Besides, with easier maintenance, high operating efficiency, low operating temperature and long service life, brushless servo motors are especially widely used, which have become high efficiency motors in common use.

3. Synchronous servo motor: A synchronous servo motor usually operates in 3 ways: generator, electromotor and compensator, of which operating as a generator is the major operating mode. The power of a synchronous servo motor is adjustable. In recent years, small synchronous servo motors are widely utilized in variable frequency speed systems. A synchronous servo motor can also be connected to the grid as a synchronous compensator. Without any mechanical load at this time, it products induction or capacity reactive power to the grid by adjusting the field current of the rotor to improve the power factor of the grid or adjust the voltage.

4. Asynchronous servo motor: Induction motor is usually called asynchronous motor. An asynchronous servo motor is equipped with advantages such as simple construction, convenient manufacture and maintenance, reliable operation, low mass and low cost. Besides, it also has high operating efficiency and good operating characteristics. It can keep a constant-speed operation whether it’s no-load excitation or full-load excitation. Therefore, it can meet the demands of the mechanic drive of the most industrial and agricultural productions.

From the above, we should choose servo motors on the basis of our knowledge of the characteristics of servos. Only when we have had a comprehensive understanding of load characteristic, working condition and motor characteristic can we choose the most suitable servo motor.


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