(19)

(11)

EP 0 929 816 A1

(12)

(43) Date of publication: 21.07.1999 Bulletin 1999/29 (21) Application number: 97944013.0 (22) Date of filing: 06.10.1997

(51) International Patent Classification (IPC):  G01P 3/ 48( . ) H02K 17/ 30( . ) (86) International application number: PCT/GB1997/002729 (87) International publication number: WO 1998/015839 (16.04.1998 Gazette 1998/15)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 05.10.1996 GB 19960020822 (71) Applicant: THE UNIVERSITY OF NOTTINGHAM Nottingham NG7 2RD (GB)	(72) Inventors: ASHER, Greg Mark Nottingham NG7 2RD (GB) WOOLFSON, Malcolm, Steven; University Park, Nottingham NG7 2RD (GB) FERRAH, Azzedine; Nottingham NG7 2RD (GB) BRADLEY, Keith, John; Nottingham NG7 2RD (GB) (74) Representative: Swindell & Pearson  48 Friar Gate Derby DE1 1GY Derby DE1 1GY (GB)