TECHNICAL SUPPORT
Published 2026-02-22
I believe that many friends who are new toservos or are working on robot or model projects have a doubt in their minds: Can the speed of aservobe adjusted? Can it only be fixed at one angle, or turn around quickly, or stay motionless? In fact, this question is very critical and is directly related to whether the movements of your work are stiff or smooth and natural. Today we are going to talk about this topic and help you understand the speed control of theservo.
The steering gear itself is a position closed-loop control system with a motor, potentiometer and control circuit inside it. The signal we usually give it is the target angle, and it will rush over at the fastest speed. But "fastest speed" doesn't mean the speed we want. In fact, speed adjustment is achieved by continuously sending a series of progressive target angles to the servo, rather than in one step. This is just like when we go up the stairs, if we take ten steps at a time, we will fall down, but we will be very stable walking step by step. The principle of controlling the speed of the servo is essentially to break down a large-angle movement into many small steps, giving each step a little time to complete.
Being able to control the speed of the servo will be a huge improvement to your project. The most intuitive thing is the realism of the movements. For example, if you make a humanoid robot, if it raises its hands and turns its head and snaps into place instantly, it will look very mechanical and even a bit scary. But if you slow down the speed and make it move evenly and smoothly like a real person, the texture and appreciation of the entire work will be completely different. On the other hand, speed regulation can also protect your mechanical structure. The instantaneous impact force will cause great damage to gears and connecting parts, especially those small plastic parts. Slow starting and stopping can greatly extend the life of the equipment.
There are two situations here. One is the common analog or digital servos on the market. They have no speed adjustment function themselves and need to rely on your controller (for example, STM32) to implement it through a program, which is the "software speed adjustment" we mentioned above. The other is a smart servo, also called a serial bus servo. This type of servo has a more powerful chip inside. You can set its running speed, acceleration and other parameters by sending instructions directly through a signal line. If you have relatively high requirements for the accuracy and convenience of motion control, especially when building a robot with multiple degrees of freedom, choosing an intelligent servo with serial port control will save a lot of trouble.
Using ordinary servos to achieve speed regulation, the code is actually not complicated. The core idea is to use a for loop to slowly change the angle of the servo. For example, if you want the servo to turn from 0 degrees to 90 degrees in 2 seconds, you can calculate that each step increases by 0.5 degrees, and then the delay between each step is about 10 milliseconds. This way the servo will turn smoothly instead of jumping over instantly. The key point is to choose the appropriate step size and delay time. If the step size is too large, the movement will still be frustrated, but if the delay is too short, the speed will be faster. You need to fine-tune these two parameters according to the actual effect to find the most suitable combination.
If you have used smart servos, you will never want to use ordinary servos again. Its advantage is that all complex calculations are done inside the steering gear. You only need to use a line to connect multiple servos in series, and then write a simple command in the program, such as "Set the No. 1 servo speed to 20 rpm, and the target position is 90 degrees", and it will be executed very accurately. What's even more powerful is that smart servos usually support multiple servos linkage and trajectory planning, allowing you to easily achieve very complex combination actions. This is a must-have feature for making bipedal robots or complex robotic arms.
When choosing a servo, you first need to look at your project budget and complexity. If you just want to make a simple gimbal, using an ordinary servo and program control is enough and the cost is low. But if you plan to make a robot that needs to perform complex movements, or have high requirements for synchronization of movements, then a smart servo will be a better choice. At the same time, consider the torque and size. Don't choose a small torque servo for the speed control function, otherwise it will not be able to drive your structure. It is recommended that you first clarify the movement requirements of the project, then search for the corresponding servo model online, read more reviews and videos, and you will have an idea.
Servo speed adjustment is actually not as mysterious as imagined. Whether it is through software simulation or hardware support, it can make your works "move" more exciting. I don’t know what kind of cool action you most want to use the speed adjustment function to achieve when you are working on a project? Welcome to share your thoughts in the comment area. If you find the article useful, don’t forget to like it and share it with more friends!
Update Time：2026-02-22
Contact Kpower's product specialist to recommend suitable motor or gearbox for your product.
