VFD Braking Resistor Calculator

Calculate minimum braking resistance R (Ω), recommended resistance, peak brake power, and continuous power rating P_R (kW) based on motor power and duty cycle.

Motor Rated Power P_M (kW)

VFD Rated Supply Voltage (AC)

Braking Torque Requirement (% of Rated) General: 100%; High inertia / Emergency stop: 125%–150%

Braking Duty Cycle (%) Occasional: 5%–10%; Frequent: 20%–30%; Hoist/Overhauling: 50%–100%

Brake Unit Activation Voltage U_d (V DC)

Results

Min Resistance Limit R_min	— Ω
Rec. Resistor Value R_rec	— Ω
Braking Peak Power P_peak	— kW
Rec. Continuous Power P_R	— kW (— W)
Peak Braking Current I_peak	— A

Formulas

R = U_d² / ( 1.36 × P_{motor_watts} × (Torque%/100) )

P_peak = U_d² / R

P_R = P_peak × DutyCycle(%)

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