The strategy to overcome servo motor jitter, take a look!

Release Time：

2025-04-10

In the field of industrial automation and precision control, servo motor vibration has always been a headache for engineers. It not only affects the accuracy and performance of the equipment, but may also lead to premature wear and even cause production accidents. Today, let's delve into the causes, solutions, and preventive measures of servo motor vibration together, to help you easily tackle this tricky problem!

Analysis of servo motor vibration phenomenon

There are various forms of servo motor vibration, and the following are some common vibration phenomena:

Enable later oscillation

The motor starts oscillating back and forth after being enabled, which is usually caused by a mismatch between the control signal during the initial start-up phase of the system and the motor response.

Sudden oscillation during operation

The sudden oscillation of the motor during normal operation may be caused by external interference, unreasonable parameter settings, or mechanical structural problems.

Shake during start stop operation

The motor oscillates at the moment of starting or stopping, which is due to the mismatch between the rapid changes in control signals during the start stop phase and the dynamic response characteristics of the motor.

Common causes and solutions

Improper adjustment of PID parameters

Symptoms: Various forms of shaking, especially when the load changes

Solution: Gradually adjust the P (proportional), I (integral), and D (derivative) parameters, starting with reducing the P value, and then fine tune I and D. If the drive supports it, the auto tuning function can be used, but it needs to be fine tuned based on the results

Inertia ratio mismatch

Symptom: Post activation oscillation

Solution: Increase the inertia ratio of the motor to improve system stability, but be careful not to slow down the response

The rigidity of the motor is too high

Symptom: Sudden oscillation during operation

Solution: Reduce the rigidity of the motor appropriately and lower the sensitivity of the system to external interference, but balance rigidity and positioning accuracy

Inappropriate position and velocity loop parameters

Symptom: Shake during start stop operation

Solution: Adjust the filtering time of the position loop and velocity loop, smooth the control signal, balance response speed and stability

mechanical resonance

Symptom: Severe vibrations occur at a specific speed or frequency

Solution: Use notch filters to eliminate vibrations at specific frequencies, reinforce mechanical structures, adjust operating speeds to avoid resonance frequencies

Feedback on equipment issues

Symptoms: Irregular shaking or inaccurate positioning

Solution: Check the encoder connection and signal quality, clean the encoder disk, and replace the feedback device if necessary

Power Problem

Symptoms: Random and irregular shaking

Solution: Check the stability of the power supply voltage, use a regulated power supply or UPS, and increase the filtering capacitor