Peak · duty · resistor arithmetic
Dynamic-braking duty
Inputs
Select the source’s normal-braking or overhauling-load average-wattage arithmetic; this does not determine the actual operating condition.
User-entered mechanical/electrical power basis in kW; motor selection and losses are excluded.
User-entered multiplier such as 1.0 for 100% from a declared matched drive/resistor context.
User-entered braking-bus voltage for the stated drive condition; it is not inferred from supply voltage.
Time energized in each declared repeating braking interval.
Complete repeating interval used only for the literal duty calculation.
Results
Declared peak braking power
5.5
Declared braking-duty ratio
10
%Source-relation derived resistance
76.818
Source-relation peak braking current
8.4615
Source-relation average braking wattage
0.275
PW = MW·BT; R = Vdc²/PW; DC = tb/tc; DBRW = PW·DC·(1/2 normal, 1 overhauling)
A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.
Nearby: Force & acceleration · Kinetic energy · Gravitational potential energy · Flywheel energy change
Method
Formula, when it applies, and when it does not
Calculate peak braking power, duty ratio, derived resistance/current, and source-normal or overhauling average wattage arithmetic without selecting a drive or resistor.
PW = MW·BT; R = Vdc²/PW; DC = tb/tc; DBRW = PW·DC·(1/2 normal, 1 overhauling)
When
- Declared motor/drive power
- Declared brake-torque multiplier and DC bus voltage
- Repeated braking/cycle timing
- Source-stated normal or overhauling type
Don’t
- This applies the cited declared-power, brake-torque multiplier, DC-bus voltage, and time-duty relations for the selected source arithmetic mode. It does not select a drive, resistor, minimum resistance, current limit, braking torque, regeneration type, enclosure, protection, wiring, thermal rating, deceleration profile, energy recovery, safety, suitability, or approval.