This article will describe a combining reactor which is used to control currents between PWM inverters to supply a motor. The target is to limit the current ripples caused by the inverters.
Therefore it is important that the inductance between the inverters is high enough but is low enough between motor and inverters to limit the voltage drop.
The reactor is naturally cooled by air and designed for a climate class C2, the sound pressure level is lower than 65dBA.
The combining reactor passes type tests which include inductance and full load current measurement, temperature rise test, load loss measurement and sound measurement.
Figure 1: Flux density between inverters and to the motor;
also the computed inductance for each case is shown
Figure 2: Combining Reactor
B.Eng. Johannes Veit
M.Sc. Felix Schulze