An electrical miniature motor

Details An electrical miniature motor An electrical miniature motor

H - Electricity

02

K

H02K 1/12 (2006.01) H02K 3/26 (2006.01) H02K 3/47 (2006.01) H02K 5/14 (2006.01) H02K 5/167 (2006.01) H02K 7/06 (2006.01) H02K 23/58 (2006.01) H02K 23/62 (2006.01)

Patent

CA 2321710

An electric miniature motor having a stator of magnetic soft material and a permanent magnetic rotor. The stator has a low electrical conductivity at least in the direction of the rotor shaft to dampen eddy currents in the stator material caused by the rotation of the rotor. The magnetizable meterial of the stator is composed of ring-shaped elements with two sections having their respective diameters so that the elements may be joined co-axially to a tubular stator. This provides the same eddy current damping properties as with a stator composed of segments, but the stator is much cheaper. The coils are formed as flat coils on a flexible foil which are arranged along the internal side of the stator.

L'invention concerne un moteur électrique miniature doté d'un stator de matière magnétique souple et d'un rotor magnétique permanent. Le stator présente une faible conductivité électrique au moins dans la direction de la tige du rotor pour amortir les courants de Foucault dans la matière de stator provoqués par la rotation du rotor. La matière magnétisable du stator est composée d'éléments annulaires présentant deux sections dont le diamètre permet l'assemblage coaxial des éléments à un stator tubulaire. Ainsi les propriétés d'amortissement des courants de Foucault sont semblables à celles d'un stator formé de segments avec l'avantage d'être meilleur marché. Les bobines sont formées de bobines plates enroulées sur une feuille souple disposées le long du côté intérieur du stator.

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