• The difference between servo motor and stepper motor Feb 27, 2024
    People who work in the machinery industry believe that they have more opportunities to deal with servo motors and stepper motors. Especially friends who do mechanical design, often need to consider whether to use a stepper motor or a stepper motor? This time we will learn more about the stepper motor. Learn the difference between motors and servo motors so that we can make a good choice. Different control methods Stepper motors and servo motors have different control methods. Stepper motors control the rotation angle by controlling the number of pulses. One pulse corresponds to one step angle. Knowing the number of pulses the angle of rotation can be calculated. But the servo motor is controlled by the length of the pulse time controls the rotation angle, so there is a difference between the two. The controller is also different We generally use stepper motors, which require stepper drivers, while servo motors are controlled by servo drivers. The working equipment and work processes of the two are also different. Different low frequency characteristics If the stepper motor is at low speed, it is prone to low-frequency vibration, which is very detrimental to the operation of the machine. So is there a solution? The answer is yes, electrical engineers can add dampers and drives can use segmentation technology to improve some low-speed performance. The low-speed performance of the servo motor is relatively good and the operation is very stable, so the servo motor can also be used in many low-speed working conditions. Speed ​​affects torque differently One characteristic of stepper motors is that the higher the speed, the greater the torque drop. We can clearly see this situation from the motion curve of the stepper motor. Therefore, if the speed of the stepper motor is too high, it will have no power. This is why the speed of the stepper motor is generally controlled at about 300-600 revolutions per minute. The AC servo motor can output constant torque, that is, it can output a rated torque within the rated speed (200 or 3000rpm), which means that the torque is not affected by the speed. This is an advantage of the servo engine. Different overload capabilities The stepper motor does not have overload capability. If the load exceeds the rated load, the stepper motor is prone to out-of-step and is inaccurate. The parameter that reflects the torque of advanced motors is static torque. The so-called static torque is the maximum torque of the stepping motor in the critical state between rotation and non-rotation. On the contrary, the servo motor has a relatively strong overload capacity and can generally allow 3 times overload. However, it is still not recommended to overload the servo motor for a long time, because the motor will generate more heat and affect the service life of the motor. Different reaction speeds It generally takes about 200-400 milliseconds for a stepper motor to rise from 0 speed to working speed. Servo motors respond much faster. It only takes a few milliseconds for the servo motor to rise from 0 speed to working speed, so the response is very fast. The performance of servo motor is more suitable for fast start and stop situations. The price difference is obvious The price of stepper motors is much cheaper than Hefu motors. Therefore, when replacing servo motors, many companies like to use stepper motors, mainly to reduce costs. If cost is not considered, servo motors are superior to stepper motors in many situations. Choosing a servo motor or a stepper motor requires a combination of the characteristics of the above two. Generally speaking, stepper motors are suitable for applications where the speed is not very high. Regarding torque, we can increase the output torque by configuring a reducer.      

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