Designing commutating inductors

Three-Phase Commutation Choke, connected before rectifier bridge with smoothing choke

• Set inductance at peak current (View the peak value on the current diagram)
• Select the AC inductance : L-Type = 2
• Select Cu round wire: Wire = 0
• The frequency of the first harmonic is 50Hz
• Set the rms values of harmonics of the thermal current: typical values In=I1/n, without 3rd and 9th harmonic
• Set the temperature rise
• Select grain oriented steel. Note that the induction will be optimized by program in order to get optimal relationship between core losses and winding losses
• Set Gap = 1 and Core Assembly = 2 or better
• Select suitable 3 phase core family

• Control the value of induction, gap and connected wires in parallel

• Round the number of turns

• In order to calibrate the choke, connect it on the calculated calibration 3 phase AC-voltages (rms value) with the calibration frequency (normally 50Hz or 60Hz) and then vary the gap until you get the calculated calibration 3 phase AC-currents (rms value).

One-Phase Commutation Choke, connected before rectifier bridge with smoothing choke

• Set inductance at peak current (View the peak value on the current diagram)
• Select the AC inductance : L-Type = 2
• Select Cu round wire: Wire = 0
• The frequency of the first harmonic is 60Hz
• Set the rms values of harmonics of the thermal current: typical values In=I1/n
• Set the temperature rise
• Select grain oriented steel. Note that the induction will be optimized by program in order to get optimal relationship between core losses and winding losses
• Set Gap = 1 and Core Assembly = 2 or better
• Select suitable one phase core family

• Control the value of induction, gap and connected wires in parallel

• Round the number of turns

• In order to calibrate the choke, connect it on the calculated calibration AC-voltage (rms value) with the calibration frequency (normally 50Hz or 60Hz) and then vary the gap until you get the calculated calibration AC-current (rms value).