(19)

(11)

EP 0 352 287 A1

(12)

(43) Date of publication: 31.01.1990 Bulletin 1990/05 (21) Application number: 88903432.0 (22) Date of filing: 30.03.1988

(51) International Patent Classification (IPC):  H02M 3/ 337( . ) (86) International application number: PCT/SE1988/000158 (87) International publication number: WO 1988/007412 (06.10.1988 Gazette 1988/22)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 01.04.1987 SE 19870001368 (71) Applicant: Fläkt AB S-131 34 Nacka (SE)	(72) Inventor: RANSTAD, Per, Anders, Gustav S-352 34 Växjö (SE) (74) Representative: Jenkler, Malte, et al  Asea Brown Boveri AB Patent Stockholm Office S-120 86 Stockholm S-120 86 Stockholm (SE)