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question

When a servo motor starts 'singing' (high-pitched whine) at specific RPM ranges but works fine otherwise, is this a mechanical resonance issue or an electrical tuning problem that needs immediate attention?

StephenJames

StephenJames

2025-12-13

answer

Hey there! That's a great question about servo motor noise. When your servo starts 'singing' at specific RPM ranges but works fine otherwise, it's actually more likely to be a mechanical resonance issue rather than an electrical tuning problem. Here's why:

Mechanical resonance happens when the motor hits a speed that matches the natural vibration frequency of your mechanical system - like the motor mounting, couplings, or connected equipment. Think of it like a guitar string vibrating at its natural frequency. This creates that high-pitched whine at specific RPMs, while other speeds are quiet.

Electrical tuning issues usually cause noise across a wider speed range or during stationary operation. They're often related to PID parameters being too aggressive or PWM frequency settings.

The good news is that mechanical resonance isn't usually an emergency if the motor still functions properly. However, you should address it because prolonged resonance can cause wear and tear. Most modern servo drives have anti-resonance filters that can help tune out these specific frequencies.

I'd recommend checking your mechanical mounting first - make sure everything's tight and aligned properly. If the noise persists, you can use your drive's anti-resonance filter settings to target those specific RPM ranges where the whining occurs.

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