3 Phase Inverters

Wound rotor motor is not the best option for SAG mills because the slip rings always are a problem even with liquid resistors. Best option is synchronous motor in combination with variable frequency drive. However if you already have the wound rotor motor the ERS operation is simple.

Instead of dissipating the rotor power in a resistor we can use it to power a 3 phase inverter that returns the power to the AC power source. The line commutated i ...