RPM and Frequency Basics

Cuándo aplica

Use this guide when teams mix rpm, Hz, and orders without writing down which shaft or gear stage they mean.

Herramienta a usar

Browser-based preliminary check for Rpm To Frequency Converter — fast estimates, not code or stamped design output.

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Pasos

  1. 1Identify which rotating element defines your fundamental mechanical frequency.
  2. 2Convert rpm to Hz with f = rpm / 60.
  3. 3Multiply by integer orders for blades, poles, or gear mesh tones when relevant.
  4. 4Compare against electrical line frequency only when you have a coupled motor scenario.
  5. 5Use FFT or tachometer data to validate assumptions on real equipment.

Ejemplos

  • Pump at 1450 rpm mapped to Hz for vibration alarms.
  • Four-pole motor approximate sync speed discussion.

Qué evitar

  • Confusing mechanical rpm with electrical frequency without pole count.
  • Using Hz for orders without stating the reference rpm.
  • Ignoring slip in induction machines when precision matters.

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FAQ

Is this structural resonance?

No. It is kinematics only; resonance needs modal analysis.

Variable speed drives?

Operating point rpm follows the drive, not nameplate sync speed.

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