Output reactor, also known as motor reactor, it is the role of capacitive charging current and the voltage on the motor winding up rate is limited within 540V/us limiting motor cable, power cable length between 4-90KW inverter and motor is more than 50m, should set the output reactor, it is also used to passivate the inverter output voltage (switch gradient), reduce the inverter components (such as IGBT) disturbance and impact.