Abstract— The Integrated Modular Motor Drive (IMMD)
concept provides a promising approach to integrating motor
drive electronics into the machine housing by modularizing both
the machine stator and the power converter. The basic module of
the IMMD consists of a stator pole-piece wound with a
concentrated coil and fitted with a dedicated power converter
unit. This paper addresses several of the challenges associated
with the design of an IMMD power converter module. In
particular, the issues associated with configuring the dc bus
capacitance to meet the demanding size requirements of the
power converter are addressed, including the effect of dc bus
connections. Experimental results for converter operation are
presented, and opportunities to further reduce the capacitor size
using active control strategies are discussed.