Calculate slip

🔄 Slip Calculations

Slip describes the difference between the synchronous speed and actual speed of asynchronous motors – an important parameter for motor analysis.

Available Calculations:

Slip: S = (Ns - N) / Ns × 100%

Calculate slip for asynchronous motors

Slip in Asynchronous Motors

Slip indicates by how much percent the rotor lags behind the rotating field. It is crucial for the operating behavior and efficiency of the motor.

Slip Calculation
S = (Ns - N) / Ns × 100%

Calculate the slip, synchronous speed, or rotor speed of an asynchronous motor.

S = (Ns - N) / Ns × 100%

💡 Enter the known values – leave the field you want to calculate empty.

✅ Result:

Example Calculation:
An electric motor with a synchronous speed of 1500 rpm shows on its nameplate a speed indication of 1450 revolutions. What slip results from these values?
S = (Ns - N) / Ns × 100%
S = (1500 rpm - 1450 rpm) / 1500 rpm × 100%
S = 3.33%

Units of Measurement:
Slip S = Percent [%]
Speeds = Revolutions per minute [min⁻¹]

Formula for slippage

S = (Ns − N) / Ns × 100%

S is the slip in percent, Ns is the synchronous speed (speed of the stator rotating field) and N is the rotor speed, each in revolutions per minute. The computer determines either the slip, the synchronous speed or the rotor speed.

What is slippage?

Slip is the speed difference between the rotor (rotor) and the stator rotating field (stator). It is one of the most important parameters of the asynchronous machine and is usually stated on the nameplate. For good efficiency, the slip should be as small as possible.

It increases under high load: the greater the torque required by the rotor, the more the speed drops. Modern asynchronous motors are therefore often operated with a frequency converter, which keeps the speed constant under every load situation.

Calculation example

A motor with a synchronous speed of 1500 rpm has a speed of 1450 rpm according to the nameplate.

S = (1500 − 1450) / 1500 × 100%
S = 3.33%