// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
│ computation suite │
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eng.DC-motor-torque-speed Calculator
Calculates the DC motor torque-speed characteristic from no-load speed, stall torque, and back-EMF constant. The torque-speed curve of a DC motor is linear — operating at half of no-load speed produces half of stall torque in the ideal case.
Inputs
V Supply V
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Ra Ohm
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
Ke V Rpm
Reference formula or conversion factor shown for context.
Kt Nm A
Rotational force (N·m) = force × perpendicular lever arm. Engine torque peaks at lower RPM; horsepower peaks higher.
I A
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Results
speed (rpm)
The computed rate of movement or processing.
torque (N·m)
Rotational force (N·m) = force × perpendicular lever arm. High torque at low RPM is ideal for hauling; high RPM suits high-speed applications.
output power (W)
Reference formula or conversion factor shown for context.
motor efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
back-EMF Vb (V)
Reference formula or conversion factor shown for context.