DC Motor Speed Control Calculator

Calculate DC motor speed, torque, and back-EMF for shunt, series, and separately excited configurations.

DC supply voltage.
V
Current flowing through the armature.
A
Resistance of the armature winding.
Ω
Back-EMF constant (V per 1000 rpm).
V/rpm
Field winding current (for speed control).
A

Results

Back-EMF-V
Motor Speed-rpm
Developed Torque-N·m
Input Power-kW
Efficiency-%
References: Chapman — Electric Machinery; NEMA MG-1