in the present invention , several polyphase devices are connected together : an inverter , and electrical rotating machine , and a resistive load or braking resistor . the purpose of the resistive load is to dissipate excess electrical power which may be produced when the inverter acts to slow down the rotating machine , causing the rotating machine to act as a generator . in common art , this resistive load is a single dc resistor coupled to the dc link of the inverter via a separate resistor control transistor . in the present invention , the resistive load is a mesh connected array of resistors , and is electrically connected to the same inverter output terminals that the rotating machine is connected to . when it is desired that the resistors absorb energy , for example from a braking operation , then the harmonic content of the inverter output is adjusted , thus placing voltage differences across the resistor array and causing current to flow in the resistors .