Motor Slip Calculator for Electrician Study

An induction motor develops torque because the rotor runs slightly slower than the rotating magnetic field. This motor slip calculator helps connect supply frequency, pole count, synchronous speed, rotor speed, and slip percentage.

Slip changes with load and operating condition. A large speed drop can be evidence worth investigating, but slip alone does not diagnose the cause.

• Synchronous speed: Ns = 120f ÷ P.
• Slip percentage: Slip% = (Ns − Nr) ÷ Ns × 100.
• Synchronous speed depends on frequency and pole count, not motor horsepower.
• Common mistakes include using rotor speed in the synchronous-speed formula or assuming zero slip under normal load.