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Details of Grant 

EPSRC Reference: GR/J01202/01
Title: THE DEVELOPMENT OF RESONANT SWITCHING AND PULSE DENSITY MODULATION TECHNIQUES FOR BRUSHLESS MACHINE DRIVES
Principal Investigator: Mellor, Professor PH
Other Investigators:
Stone, Professor DA
Researcher Co-Investigators:
Project Partners:
Pre Nexus Migration
Department: Electronic and Electrical Engineering
Organisation: University of Sheffield
Scheme: Standard Research (Pre-FEC)
Starts: 01 February 1994 Ends: 31 January 1997 Value (£): 101,867
EPSRC Research Topic Classifications:
Energy Efficiency Power Electronics
EPSRC Industrial Sector Classifications:
No relevance to Underpinning Sectors Electronics
Related Grants:
Panel History:  
Summary on Grant Application Form
The present high performance brushless drives utilise pulse-width modulated (PWM) controlled voltage source inverters which suffer from high levels of loss when switched at the high frequencies necessary to achieve good system performance and reduce audio noise. PWM with high switching rates also gives rise to a large amplitude electromagnetic (EMI) emissions at fixed frequency bands. The proposed research is to develop resonant elements which ensure that the power semiconductor switches only change state at zero voltage or zero current and thereby remove switching loss. Alternative, pulse density modulation (PDM), control schemes will be investigated which are suited to the resonant converter operation and lead to lower EMI as a consequence of a more even spectral distribution of the emitted electromagnetic noise, whilst improving systems response by allowing higher frequency operation. The focus of the work will be towards battery powered vehicle applications where high efficiency and high performance are essential requirements and the project is fully endorsed by two industrial collaborators involved in electric vehicle drive systems.
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Organisation Website: http://www.shef.ac.uk