Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Frequency (Hz) (Hz)

Required number input.

Pole Count

Required integer input.

Calculate AC motor synchronous speed in RPM from electrical frequency and an even number of magnetic poles, using 120f/P. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Synchronous Speed (rpm) (rpm)

The resulting synchronous speed (rpm) returned as a number.

• Motor constants, current, torque, speed, reactive power, and propeller thrust depend on winding temperature, controller, supply sag, losses, saturation, load curve, airflow, and operating point. Nameplate constants and ideal propeller laws need test data for final sizing.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Motor Slip Percentage

  Calculate induction-motor slip as the percentage difference between synchronous and rotor speed relative to synchronous speed.

• Stepper Motor Pulse Frequency From Rpm

  Convert stepper motor shaft speed to pulse frequency from full or microsteps per revolution; the step count must include the chosen microstepping mode.

• Ac Motor Reactive Power

  Calculate positive reactive-power magnitude for a balanced three-phase motor from line voltage, line current, and power factor.