Multi-motor drive system based on a two-stage direct power conversion topology for aerospace applications

In the conventional multi-motor drive systems, a single rectifier feeds a number of inverters through the common DC- link circuit. The limitation of this system is requirement of bulky DC-link, which has a short life time compared to other electronic devices. As a result, the overall converter lifetime is reduced. This paper proposes a multi-motor drive system based on a two-stage matrix converter. In this example, the two motor are connected to the same shaft and the requirement for DC-link components is eliminated to save converter weight and volume.