Inverter Braking Resistor Calculation

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.

Inverter braking resistor calculation.

Peak braking power 0 w. The calculator will list the best combinations of resistors and connection arrangements. Man on bike 60kg man 20kg bike 15mph or 7m s. Average braking power 0 w.

How do you calculate the stopping energy put into a dynamic braking resistor. Due to production tolerance and temperature coefficient the recommended resistance value is significantly higher than the minimum resistance value. Brake resistor calculator instructions for use. Brake time or duty cycle and the total cycle time.

Max resistance 0 ohms. Minimum resistance ohms. Please note braking power is conservatively stated slightly overstated motor and drive efficiency is considered 100. Leave the watts entry blank or enter a value if you prefer to reduce the options.

To calculate the right size of the resistor you need the characteristic data of the load cycle. 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. Calculating braking resistor value r v dc switch on p peak ppeak motor power rating x maximum torque x efficiency motor power rating. Kinetic energy m v2 2 e g.

Ohms dc bus volts 2 peak power higher ohmic values can be used. Average braking power 0 w. Metres kilograms seconds and for rotational energy radians. Furthermore you need the brake power pbr and the minimum resistance value rmin which is defined by the vfd.