What is the difference between poles and pole pairs?

Pole pairs (p) represent half the total number of magnetic poles. A 4-pole motor has 2 pole pairs, and a 6-pole motor has 3 pole pairs.

How does the calculator determine if the motor is in generator mode?

If the measured rotor speed is higher than the synchronous speed, the calculated slip becomes negative (s < 0), indicating generator operation.

What unit should I use for the slip input?

Slip must be entered as a decimal fraction between 0 and 1. For example, enter 0.04 to represent a 4% slip.

Can this calculator be used for single-phase induction motors?

Yes, the synchronous speed and slip formulas apply to single-phase induction motors as well.

What are typical slip values for standard induction motors?

Standard full-load slip values typically range from 0.01 (1%) for large motors to 0.05 (5%) or more for smaller motors.

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Three-Phase Induction Motor Slip Calculator

Compute three-phase induction motor slip: synchronous speed n_s = 60·f/p and slip s = (n_s − n)/n_s. Supports slip-from-speed and speed-from-slip modes; automatically flags generator mode (s < 0).

Execution

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2 examples

Slip from speed: f=50 Hz, p=2 (4 poles), n=1440 rpm → n_s=1500, s=0.04 (4%)

n_s = 60·50/2 = 1500 rpm. s = (1500 − 1440)/1500 = 0.04 = 4%. Typical 4-pole motor at 50 Hz.

{"result":"Induction motor slip, mode=slipFromSpeed. f=50 Hz, pole pairs p=2 (4 poles). Synchronous speed n_s = 60·f/p = 1500 rpm. From rotor speed n=1440 rpm → slip s = (n_s − n)/n_s = 0.04 (4%). Operating mode: motor.","metadata":{"input":{"mode":"slipFromSpeed","frequency":50,"poles":2,"rotorSpeed":1440},"result":{"synchronousSpeed_rpm":1500,"rotorSpeed_rpm":1440,"slip":0.04,"slipPercent":4,"frequency_Hz":50,"polePairs":2,"poleCount":4,"mode":"motor"}}}

Speed from slip: f=60 Hz, p=3 (6 poles), s=0.05 → n_s=1200, n=1140 rpm

n_s = 60·60/3 = 1200 rpm. n = n_s·(1 − 0.05) = 1200·0.95 = 1140 rpm.

{"result":"Induction motor slip, mode=speedFromSlip. f=60 Hz, pole pairs p=3 (6 poles). Synchronous speed n_s = 60·f/p = 1200 rpm. From slip s=0.05 → rotor speed n = n_s·(1−s) = 1140 rpm. Operating mode: motor.","metadata":{"input":{"mode":"speedFromSlip","frequency":60,"poles":3,"slip":0.05},"result":{"synchronousSpeed_rpm":1200,"rotorSpeed_rpm":1140,"slip":0.05,"slipPercent":5,"frequency_Hz":60,"polePairs":3,"poleCount":6,"mode":"motor"}}}

Inputs

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6 options

SettingsAdjust formats, ranges, numbers, and modes.6

Solve ModeselectOptionalFrequency f (Hz)numberRequiredSupply frequency in Hz (50 Hz or 60 Hz are most common).Pole Pairs pnumberRequiredNumber of POLE PAIRS p (not total poles). A 4-pole motor has p=2; a 6-pole motor has p=3.Rotor Speed n (rpm)numberOptionalRequired for Slip-from-speed mode. Enter the measured rotor speed in rpm.Slip s (0–1)numberOptionalRequired for Speed-from-slip mode. Enter slip as a fraction (0.04 means 4%).Decimal PlacesnumberOptional

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Three-Phase Induction Motor Slip Calculator

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Key facts

Overview

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Use cases

Examples

1. Calculating Slip from Measured Rotor Speed

2. Predicting Rotor Speed from Rated Slip

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