Machines & Drives

Rotating machine and variable-frequency-drive calculations built around the induction motor equivalent circuit: steady-state performance from R/X parameters, nameplate-based estimates, full torque-speed curve generation, DOL starting current and voltage dip, and V/Hz drive operating points.

Induction Motor Equivalent Circuit Solver

Stator current, torque, efficiency, and power factor from R1, X1, R2', X2', Xm at a given slip.

Induction Motor Performance from Nameplate

Estimate full-load current, torque, and slip from HP/kW, voltage, poles, efficiency, and power factor.

Induction Motor Torque-Speed Curve Generator

Full torque-speed curve from equivalent-circuit parameters, marking starting, breakdown, and rated torque.

Motor Starting Current & Voltage Dip Estimator

Locked-rotor starting current and the resulting bus voltage dip for a direct-on-line start.

V/Hz Drive Operating Point Calculator

Synchronous speed, commanded voltage, and approximate torque capability for a V/Hz-controlled drive.