TECHNICAL SUPPORT
Published 2026-03-11
When playing with the steering gear, rudder vibration, loud noise, inaccurate rotation or even no rotation at all are all troublesome problems. In fact, as long as you master the correct debugging methods, most of these problems can be easily solved. Today, as someone who often deals withservos, I will talk to you about the most practical and down-to-earthservos debugging methods to help you avoid detours.
Playing with servos is definitely inseparable from debugging software. Different steering gear brands usually have their own supporting software, such as the commonly used Servo of Wisdom, the debugging platform of Lesai Intelligent, etc. These software are like remote controls for the servo, allowing you to command it from your computer.
After downloading and installing the software, the first thing is to connect the servo to the computer through a dedicated debugging cable, usually a USB to serial port. After the connection is successful, the current status of the servo, such as current position, temperature, voltage, etc., will be displayed on the software interface. This step is very critical, just like giving the steering gear a comprehensive physical examination to see if it is healthy.
Then you can start debugging parameters. The most common one is to adjust the PID parameters, which are the three values of proportion, integral, and differential. You can start with the defaults and adjust them little by little. For example, first increase the proportion parameter to make the servo respond faster, but if you find that it shakes badly, you need to reduce it appropriately. This process is a bit like adjusting the suspension of a car. It must be both supportive and comfortable.
If the servo is shaking, don't be in a hurry to disassemble it. In most cases, the parameters are not adjusted properly. Just like when we talk in daily life, if the tone of voice is too high, it will easily break, and if the parameters of the servo are too aggressive, it will tremble. At this time, the proportional gains of the speed loop and position loop can be appropriately reduced.
Insufficient power supply is also a common cause of jitter. Servos consume a lot of electricity when working, especially high-torque servos, where the instantaneous current may be very large. If your power supply is not powerful enough, the voltage will be unstable and the servo will naturally shake. It is recommended to use a switching power supply with sufficient power, generally 24V, 10A or above is more reliable.
Looseness of the mechanical structure cannot be ignored. Check the fixing screws of the servo arm and connecting rod. If they are loose, the servo will produce gaps during repeated movements, which will be manifested as jitter. Tightening the screws often results in immediate results.
It must be done, and it must be done seriously. The zero position is like the reference point of the servo. If this point is offset, all its movements will be offset. For example, your robot originally wanted to move forward, but due to the inaccurate zero position of the servo, it might run diagonally.
The calibration method is actually not difficult. Most debugging software has a zero position calibration function. Click the button and the servo will automatically rotate to the mechanical zero position, and then you can manually fix it. Another method is to manually adjust, remove the servo arm, let it idle back to the neutral position, and then reinstall the servo arm.
Remember to save the parameters into the servo after calibration. In this way, even if the power is cut off and restarted, the zero position will not be lost. Otherwise, it would have to be recalibrated every time it is powered on, which would be very troublesome.
It's really distressing when the servo burns out, but in some cases it's not broken, but the parameters are locked. First smell if there is a burnt smell. If there is, it is basically confirmed that it is burned. If there is no smell, you can try restarting.
Turn the output shaft by hand. A good servo will have a certain resistance when the power is turned off because of the reduction gear. If it spins very loosely, like idling, the internal gear is probably broken. If it is completely stuck and cannot rotate, it may be mechanical jamming or the motor is burned out.
The most accurate way is to read the status through software. After connecting to the computer, check if there are any error messages, such as overcurrent, overheating, stalling, etc. If there are these records, it means that the steering gear may have been damaged and needs to be repaired or replaced.
The robot's slow response is often caused by the servo's response speed not being able to keep up. First check the control cycle, which is the frequency at which the main control board sends instructions to the servo. If the frequency is too low, no matter how fast the servo is, it will not be able to speed up. Generally, it is more appropriate to set it to 50Hz to 100Hz.
Then there are the acceleration parameters. Many people only focus on maximum speed, but acceleration is also important. Just like driving a car, the speed increase is slow because the accelerator is not pressed enough. By appropriately increasing the acceleration parameter, the servo can reach the target speed faster.
Loading too heavily can also slow down response. You can check the mechanical structure to see if there is any jamming, or if the torque selected for the servo is too small. If the torque is not enough, then you have to consider replacing the servo with a larger torque. No matter how you adjust the software, you cannot adjust the potential of the hardware.
Debugging with the host computer is actually to precisely control the steering gear through computer software. The trick is to learn to read graphs. Good debugging software will display the waveforms of position, speed, and current in real time. Through these curves, you can intuitively see the smoothness of the steering gear operation.
If the curve jitters violently, it means that the parameters need to be optimized. If the curve is smooth but slow to respond, try adding some gain. In addition, you must learn to use the oscilloscope function of the software to capture instantaneous abnormal waveforms, which can help you find the source of the problem.
There are also techniques for batch debugging. If there are many servos in your project, adjusting them one by one is too slow. You can adjust one first, then export the parameters, and then import them into other servos in batches, which is much more efficient.
Okay, these are the basic methods for servo debugging. From software connection to parameter adjustment, from jitter resolution to fault diagnosis, every step is based on practical experience. I wonder if you have encountered any particularly difficult problems when debugging the steering gear? Welcome to leave a message in the comment area, let’s communicate and discuss together. If you find the article useful, don’t forget to like it and share it with more friends who need it!
Update Time：2026-03-11
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