Synchronous Speed · Slip · Shaft Torque
Calculate synchronous speed, actual rotor speed, slip and shaft torque for AC induction motors based on supply frequency, number of poles and rated power. Useful for motor selection, gearbox ratio calculations, and understanding motor performance characteristics.
Results for guidance only. Verify against current standards and manufacturer data.
Not a substitute for engineering judgement or a licensed professional.
Synchronous speed is fixed by supply frequency and pole count: Ns = 120f/P. Actual rotor speed is always slightly lower due to slip — the difference between the rotating magnetic field speed and rotor speed that induces current in the rotor windings. Shaft torque is derived from power and angular velocity: T = P/(ω), where ω = 2πN/60.