servo motor Servo refers to the control mechanism. In the field of technology, the controlling side is called the master, and the controlled side is called the slave. It is said that both servo and slave originate from the Latin word Servus (slave).

That is to say, the name servo motor means a motor that works faithfully according to instructions. As long as it can control the rotational position and speed, any motor with any mechanism is called a "servo motor".

Types of servo motors

Servo motors can be divided into two categories: DC servo motors and AC servo motors.

DC servo motor

A servo motor driven by a brushed DC motor. DC motors are easier to control than AC motors, and they are smaller in size and lower in price, so they were widely used in the past. However, with the development of AC motor control technology, the opportunities for their use are becoming increasingly rare now.

AC servo motor

A servo motor driven by an AC motor. Its control is more complex than DC motors, but with the development of control technology, it is now the most commonly used servo motor.

AC servo motors can be divided into two types based on the type of drive motor: synchronous (SM) type and induction (IM) type. The difference between the two lies in whether permanent magnets are used.

Synchronous (SM) type uses permanent magnets. The higher the output power of the motor, the more expensive permanent magnets are used, resulting in higher costs. Therefore, it is mostly used in fields with low output power (less than 10kW). Nowadays, with the emergence of high-performance permanent magnets, synchronous type has become the mainstream product.

Induction (IM) type does not use permanent magnets and is used in fields with high output power (above 10kW).

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