Servo motors are widely used in industrial automation, CNC machine tools, robots, packaging equipment and other fields because of their high precision, fast response, stable torque control and other advantages. However, in the actual use of the process, many companies will encounter the problem of servo motor noise, not only affect the normal operation of the equipment, but also may reduce production efficiency. So, what are the causes of servo motor noise? How to effectively reduce the noise? This article will combine servo drive debugging, motor resonance elimination and other methods to help you find the best noise reduction program.
Common causes of servo motor noise
Electromagnetic noise
Electromagnetic noise of servo motors is usually caused by electromagnetic interference within the motor, irrational winding design, harmonic interference and other factors. Especially in high-speed operation, if the motor current waveform distortion, it will produce large electromagnetic noise.
Solution
Optimize the PWM carrier frequency to reduce harmonic interference.
Check whether the motor winding is aging, and replace the winding or use a higher quality winding if necessary.
Reasonable debugging servo drive, optimize current loop parameters, reduce electromagnetic interference.
Mechanical Resonance Noise
Resonance problem is one of the important sources of servo motor noise. Servo motors operating at certain specific frequencies may resonate with the mechanical structure of the equipment, resulting in increased noise and even affecting the life of the motor.
Solution
Adjust the servo system gain to avoid running the motor at the resonance frequency point.
Install dampers or flexible couplings to reduce the impact of resonance.
Optimize the equipment support structure to enhance rigidity and reduce vibration.
Bearing and Mechanical Structure Problems
Damaged bearings, insufficient lubrication, and improper installation of servo motors can also lead to abnormal noise. When the bearings are worn out, the motor will produce abnormal noise when running, and the vibration of the motor will also aggravate the noise problem.
Solution
Regularly maintain the bearings, replace aged bearings and ensure good lubrication.
Check whether the motor is centered with the load, adjust the mounting precision to avoid axial offset.
Avoid overload operation, long-term high load work will accelerate bearing damage.
Servo drive debugging: the key to accurate noise reduction
The noise of servo motors not only comes from the motor itself, but also the parameter settings of the servo drive will affect its operational stability. Reasonable servo drive debugging can optimize the motor’s working condition, thus reducing noise.
Optimize the key parameters of the servo drive
Reduce the gain parameter: high gain may lead to unstable motor operation and increased noise, appropriate reduction of position loop and speed loop gain can effectively reduce noise.
Adjust the PWM frequency: Appropriately adjusting the PWM carrier frequency can reduce the current waveform distortion, thus reducing electromagnetic noise.
Enable low noise mode: Some servo drives come with low noise mode, which can reduce the operating noise through parameter settings.
In the debugging process, it is recommended to use an oscilloscope to analyze the motor current waveform and find the best parameter settings to make the motor run more smoothly and reduce unnecessary noise and vibration.
Motor Resonance Elimination: Avoiding Noise from Mechanical Structures
Motor resonance elimination is an important part of servo motor noise reduction. Resonance not only leads to an increase in noise, but may also affect the precision and service life of the motor. Therefore, when using servo motors, effective measures need to be taken to eliminate resonance problems.
Effective methods for resonance elimination
Adjust the servo control parameters: reduce the servo gain to keep the motor away from the resonance frequency.
Increase structural rigidity: Strengthen the frame structure to reduce vibration transmission and improve stability.
Use dampers: Install mechanical dampers or use flexible couplings to reduce the impact of mechanical resonance.
Adjust the operating speed: if possible, avoid the resonance frequency range, reduce the impact of resonance.
Through these methods, the noise problem of the servo motor can be effectively reduced to make the equipment run more stably.
Summarize: how to effectively solve the problem of servo motor noise?
Noisy servo motor is usually caused by electromagnetic noise, mechanical resonance, bearing problems and other factors. For different sources of noise, we can take the following measures:
✅ Optimize the servo driver debugging, adjust the gain and PWM frequency to reduce electromagnetic noise.
✅ Eliminate motor resonance, increase mechanical rigidity, install dampers to avoid noise intensification.
✅ Regularly maintain the bearings to ensure good lubrication and avoid additional noise due to wear and tear.
Combined with servo drive debugging, motor resonance elimination and other technical means, you can significantly reduce servo motor noise and improve the operational stability of the equipment. If your equipment has serious noise problems, it is recommended to consult a professional servo motor technical team to get a more accurate solution!