Integration of U Machine and Current-Source-Inverter (CSI)

The drive system includes electric machine and inverter. The cost of a drive system for vehicles is currently too high. It is over four times the DOE 2020 cost target. Permanent magnet (PM) is a major cost item in an interior PM machine. The cost of other PM machines such as PM wind power generators, megawatt PM motors, and etc…depend on the supply of rare earth PMs. Voltage source inverters (VSIs) need bulky, expensive and temperature limited DC bus capacitors. As operational temperatures increase, the ability of film capacitors to handle ripple currents decreases, necessitating the addition of even more capacitance. Current source inverter (CSI) can eliminate large portion of the capacitors but requires additional inductors.

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