Patent ID: 7692525
Filing Date: 2010-04-06
Classification: H01F,H02M,Y10T

Abstract:
1. A motor drive comprising: rectifier circuitry coupled to an AC power source and configured to provide power to a DC bus; inverter circuitry coupled to the DC bus and configured to generate drive signals for driving a motor; a cooling channel disposed adjacent to the rectifier circuitry and the inverter circuitry and configured to draw heat from the rectifier circuitry and the inverter circuitry; and a choke assembly disposed in the cooling channel comprising: an inductor coil comprising an insulated conductor wound around a central axis; a potting disposed about the inductor coil, the potting configured to encase the inductor coil in a ring-shaped housing with an opening for receiving a magnetic core; and a magnetic core disposed within the opening, coaxially with the inductor coil, wherein the inductor coil comprises inductor leads coupled to the ends of the insulated conductor and wherein the potting comprises a projection that insulates a portion of the inductor leads inside the cooling channel and mates with an opening in a barrier separating the cooling channel from at least the rectifier circuitry and the inverter circuitry.