VFD Braking Resistor Calculator
Calculate minimum braking resistance R (Ω), recommended resistance, peak brake power, and continuous power rating PR (kW) based on motor power and duty cycle.
General: 100%; High inertia / Emergency stop: 125%–150%
Occasional: 5%–10%; Frequent: 20%–30%; Hoist/Overhauling: 50%–100%
Results
| Min Resistance Limit Rmin | — Ω |
| Rec. Resistor Value Rrec | — Ω |
| Braking Peak Power Ppeak | — kW |
| Rec. Continuous Power PR | — kW (— W) |
| Peak Braking Current Ipeak | — A |
Formulas
R = Ud2 / ( 1.36 × Pmotor_watts × (Torque%/100) )
Ppeak = Ud2 / R
PR = Ppeak × DutyCycle(%)