Useful Formulas For Induction Motor Calculations

1- Motor Synchronous Speed = (120).f / p                                                                                               ( where f is frequency which is in motor supply or Drive output, p is no of pole in motor )

2- Motor Shaft output power  P= √3 V. I. cosØ.η   and Another P=(M.n)/9550                                        ( where V is Supply to motor, I is Current in motor supply, CosΦ is power factor, M is Torque, n is Speed in rpm,η is efficiency for normal use please consider η=1 )

3- Motor Torque  M= 9550.P/ Rpm                                                                                                           ( Where P is motor power and Rpm is Motor speed)

4- Motor Stall torque in field weakening / Motor Stall torque in more than rated frequency range             M= (Fn/F)².Mrated                                                                                                                                ( where Fn is rated frequency , F is running frequency in field weakening range, Mrated is rated motor stall torque )

Credit ——————– RAZA