Standard PWM Frequency for Servo Motors: What You Need to Know in Hz

01Why 50 Hz Is the Standard for Most Servos

The 50 Hz standard originates from analog radio control systems. A 50 Hz PWM signal sends a pulse every 20 ms. The servo interprets the pulse width (typically between 1 ms and 2 ms) to determine the target angle:

1 ms pulse→ 0° (or one extreme)

1.5 ms pulse→ 90° (neutral position)

2 ms pulse→ 180° (opposite extreme)

This timing works reliably for the vast majority of servos found in educational kits, robotic arms, RC cars, and model aircraft. For example, a typical 9g micro servo used in a small robotic claw will respond perfectly to a 50 Hz signal from an Arduino or Raspberry Pi.

02When to Use Higher Frequencies (100 Hz – 330 Hz)

Digital servos with faster control loops can accept higher frequencies, often up to 300–330 Hz. Higher frequencies provide:

More frequent position updates (smoother motion)

Reduced latency for quick movements

Better performance in high-speed applications like quadcopter swashplates or racing robots

Common scenario:A digital servo rated for 200 Hz will have a period of 5 ms. If you feed it a 50 Hz signal, it will still work but may feel sluggish. Conversely, feeding a standard analog servo a 200 Hz signal can cause overheating, buzzing, or erratic movement because the servo’s internal circuitry cannot process pulses that quickly.

03Practical Recommendations Based on Real-World Use

1. Check the servo’s datasheet first– The manufacturer’s specified frequency range (e.g., “40–250 Hz”) is the only reliable guide.

2. Start with 50 Hz for any unknown servo– This safe default works for over 95% of non-industrial servos.

3. Increase frequency only if:

The servo is explicitly labeled “digital high-speed”

You need faster response for a competitive robot or gimbal

The datasheet confirms support (e.g., 100–200 Hz)

4. Never exceed 330 Hzfor standard RC servos – beyond that, even many digital servos lose torque or fail. Industrial-grade servos (not covered here) use completely different control schemes.

04Actionable Advice for Your Project

For a first-time servo user:Set your PWM generator to 50 Hz, pulse widths 1–2 ms. This will work with any servo you buy from a hobby store.

For upgrading performance:If your current servo feels slow, verify it’s a digital model, then test 100 Hz. Increase in 50 Hz steps while checking for smooth operation and no overheating.

For troubleshooting jitter:First,ensure your power supply can deliver sufficient current (servos draw up to 1A or more). Second, revert to 50 Hz – many jitter problems are caused by overly high frequency, not hardware defects.

05Core Takeaway

The universally safe PWM frequency for standard servos is 50 Hz.Only deviate from this if you have confirmed your servo supports higher frequencies and your application genuinely needs faster response. Always prioritize the servo’s datasheet over online anecdotes. When in doubt, 50 Hz will never damage your servo, while higher frequencies might.