Inverter Braking Resistor Calculation

Due to production tolerance and temperature coefficient the recommended resistance value is significantly higher than the minimum resistance value.

Inverter braking resistor calculation.

Man on bike 60kg man 20kg bike 15mph or 7m s. Kinetic energy m v2 2 e g. Ohms dc bus volts 2 peak power higher ohmic values can be used. Metres kilograms seconds and for rotational energy radians.

Use drive power rating if unknown maximium torque typically 100 to 200 use 1 5 if unknown motor efficiency typically 0 8 to 0 98 use 0 95 if unknown. Average braking power 0 w. The minimum ohms are set by the drive manufacturer and will produce braking power at the peak rating of the drive or its braking module. Enter the minimum brake resistor ohms required by the inverter.

Average braking power 0 w. Stop energy remember friction drag etc all work in your favour remember first of all to convert everything into the right units. Brake resistor calculator instructions for use. Leave the watts entry blank or enter a value if you prefer to reduce the options.

Calculating braking resistor value r v dc switch on p peak ppeak motor power rating x maximum torque x efficiency motor power rating. Please note braking power is conservatively stated slightly overstated motor and drive efficiency is considered 100. The calculator will list the best combinations of resistors and connection arrangements. They will reduce the braking power proportionally and hence increase the stop times for any given load.

To calculate the right size of the resistor you need the characteristic data of the load cycle. How do you calculate the stopping energy put into a dynamic braking resistor. Furthermore you need the brake power pbr and the minimum resistance value rmin which is defined by the vfd. Minimum resistance ohms.