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On this page, we offer several calculation tools that can be helpful, among other things, in the design of three-phase asynchronous motors. Please note that all information and calculations are non-binding.
Formulas for three-phase asynchronous motors
RPM Idle speed
P = (1 − s) · Pδ Mechanical power without friction losses
Pv2 = s ·Pδ Electrical power loss in the rotor
W three-phase active power
P = 2πn ·M Mechanical power at the shaft
Nm rated torque
cos φ = P / S Power factor
sin φ = Q / S Reactive power factor
% efficiency
A active current
S = U x I x √3 apparent power
P = U x I x cos φ x √3 active power
Q = U x I x sin φ x √3 reactive power
