Rotor of a permanent-magnet motor and corresponding...

H - Electricity – 02 – K

Patent

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Details

H02K 15/03 (2006.01) F04D 25/06 (2006.01) H02K 1/27 (2006.01) H02K 7/14 (2006.01)

Patent

CA 2472229

A method for making a rotating part of plastic material for a permanent magnet motor and a rotor arranged on the outer circumference of the rotating part, said rotor comprising an annular part (1) and a permanent magnet unit fitted around it, in which method the rotating part is cast in a mold tool (4). The annular part (1) together with the permanent magnets (2) is placed inside a plastic injection mold tool (4), said plastic injection mold tool (4) being divided radially into several sectors (4a-4d) which are provided with slots (6) allowing them to be moved radially by an actuator. When the plastic injection mold tool (4) is being closed, the sector are tightened radially inwards, specifically closing the air gap between the outer surface of the permanent magnet unit (2) and the sectors of the plastic injection mold tool (4), whereupon plastic injection molding is performed.

L'invention concerne un procédé de fabrication d'une partie rotative en plastique destinée à un moteur à aimants permanents et un rotor disposé sur la circonférence extérieure de la partie rotative, ledit rotor comprenant une partie annulaire (1) et une unité d'aimants permanents ajustée autour de la partie annulaire. Dans ce procédé, la partie rotative est fondue dans un moule (4). La partie annulaire (1) et les aimants permanents (2) sont placés à l'intérieur du moule d'injection de matières plastiques (4), lequel est divisé radialement en plusieurs secteurs (4a-4d) munis de fentes (6) qui leur permettent de se déplacer radialement au moyen d'un dispositif de commande. Lorsque le moule d'injection de matières plastiques (4) est fermé, les secteurs se resserrent dans une direction radiale intérieure, fermant de manière spécifique la couche d'air qui sépare la surface extérieure de l'unité d'aimants permanents (2) et les secteurs du moule d'injection de matières plastiques (4), ce qui permet d'accomplir le moulage par injection de matières plastiques.

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