Integrated motor drives: state of the art and future trends

With increased need for high power density, high efficiency and high temperature capabilities in Aerospace and Automotive applications, Integrated Motor Drives (IMD) offers a potential solution. However, close physical integration of the converter and the machine may also lead to an increase in components temperature. This requires careful mechanical, structural and thermal analysis; and design of the IMD system. This paper reviews existing IMD technologies and their thermal effects on the IMD system. The effects of the power electronics (PE) position on the IMD system and its respective thermal management concepts are also investigated. The challenges faced in designing and manufacturing of an IMD along with the mechanical and structural impacts of close physical integration is also discussed and potential solutions are provided. Potential converter topologies for an IMD like the Matrix converter, 2-level Bridge, 3-level NPC and Multiphase full bridge converters are also reviewed. Wide band gap devices like SiC and GaN and their packaging in power modules for IMDs are also discussed. Power modules components and packaging technologies are also presented

RELATIONSHIP BETWEEN BUSINESS DEFINITION AND CORPORATE GROWTH: THE EFFECT OF FUNCTIONAL ALIGNMENT

In previous research, the hypothesis drawn from Theodore Levitt's idea that companies could continuously grow by 'functional' business definitions was statistically proved with 50 Japanese electric/electronics companies. The current research tests the hypothesis that in the case where the functions in corporate business definitions, divisional business definitions and products and services are all aligned, it will ultimately bring continuous growth to the company, through case studies and content analysis of four companies with highly functional corporate business definitions. As a result, it is proved that the company that successfully aligns the functions on every level continuously grows at a higher rate than the others. Copyright 2008 The Author. Journal compilation 2008 Blackwell Publishing Asia Pty Ltd