Torque（N.m)T= Output power (kW)÷Rotate speed (r/min)9550

Rated current (A)In=Output power (kW)÷√3÷ V÷ power factor÷ Efficiency

Synchronous speed（r/min）No= 120×Frequency Hz÷ pole

Slip ratio (%)S= (Synchronous speed（r/min）- Rated speed（r/min）)÷Synchronous speed（r/min）