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HomeNewsThe difference and principle of stepper motor, steering gear and servo motor

The difference and principle of stepper motor, steering gear and servo motor

2020-08-08
What is the difference between Stepper Motor, servo motor and steering gear?

Stepping motor is an open-loop control element stepping motor that converts electrical pulse signals into angular displacement or linear displacement. It is an induction motor.

Servo motor (servo motor) refers to the engine that controls the operation of mechanical components in the servo system, and is an auxiliary motor indirect speed change device.

The so-called steering gear is actually a low-end servo motor system, and it is also the most common servo motor system.


The biggest difference between Stepper motor and servo motor in selection and use is:

The speed requirements are different. Stepping is suitable for low speed occasions and occasions where the speed adjustment range is small. Where the servo motor can control a large speed.

Controllable reliability is different. Because the servo motor has a feedback signal, high reliability control can be achieved in the control system.

The output torque requirements are different. At present, the largest series of stepping motors at home and abroad is 130 frames. The maximum output static torque is 50 N·m. The servo motor can have 180 frames or more, and the output torque of 60 N.m or more is optional.


Correct the misunderstandings in several aspects:

1. The precision of stepping motors is lower than that of servo motors. In fact, the control accuracy is enough! The accuracy is relative.

2. When the stepper motor and the servo motor have the same power, the torque of the stepper motor is small. The output torque of the stepper motor is related to the working speed.

Servo motors have constant torque. Take 750W stepper and AC servo motor as an example. At low speed, the torque output by stepper is several or even ten times that of servo!

3. Stepper motors are used in low-precision occasions
wrong! Stepping motors can also be used in many high-precision occasions, and the use is far more than the main items listed above. No matter from which aspect, the servo motor cannot eliminate the stepper motor. For a long time in the future, these two motors will exist in parallel.

Four, servo motor and servo system
The motor is the motor, and the system is the system. Simply put, a servo motor adds a feedback control signal to a motor to become a servo motor. Adding a Dc motor to a DC servo motor, adding an AC motor to an AC servo motor! If it is classified, the servo motor should belong to the category of DC and AC motors!
In fact, the servo motor is such a motor, it is mainly used for more accurate position, speed or torque output. To be precise, a servo motor is not a motor, but a system. So just a motor can not be regarded as a servo motor, because they do not have the function of a servo motor. Servo motor is a motor system, which includes motors, sensors and controllers. Brushless DC motors can be part of servo motors, and AC motors can also be, but they are not servo motors. As a system, it may or may not have a reduction gear.


The motor is a very common thing, but it is not easy to recognize all the principles of the motor, and which type of motor to choose for what occasion.

Shenzhen Maintex Intelligent Control Co., Ltd.
Business Type:Manufacturer
Product Range:DC Motor , AC Motor , Stepper Motor
Products/Service:Stepper Motor , Brushless motor , Dc motor , treadmill used motor , Brushed Dc Motor , Fuji motor
Certificate:ISO14001 , ISO/TS16949 , ISO9001 , RoHS
Company Address:Zhengde Science Park, No. 8, Pingdi Street, Longgang District, Shenzhen, Guangdong, China

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