Electric motor cooled by a fluid and having high specific power

Details Electric motor cooled by a fluid and having high specific power Electric motor cooled by a fluid and having high specific power

H - Electricity

02

K

H02K 9/22 (2006.01) A61M 1/10 (2006.01) H02K 5/02 (2006.01)

Patent

CA 2352234

Disclosed is a micromotor with a motor housing (20) formed of polymer material. Said motor housing (20) surrounds the stator (24). The motor drives a pump part (12), which pushes fluid along the motor housing (20). The polymer material of the motor housing (20) contains an electrically isolating filler having caloric conductibility, especially Al2O3. Thereby, the temperatures arising in the motor housing are reduced. Furthermore, the hollow spaces of the coils (24a) of the stator can be filled up with a polymer material which contains a filler with caloric conductibility. The internal temperature of the motor is reduced as a result of the heat carried away to the fluid flowing around the motor. The micromotor is particularly useful for an intravascular blood pump.

L'invention concerne un micromoteur présentant un bâti (20) moulé en matériau polymère, qui entoure le stator (24). Ce moteur entraîne une partie pompe (12), qui déplace un liquide le long du bâti (20). Afin de permettre une amélioration de la dissipation de chaleur, le matériau polymère du bâti (20) renferme une charge isolante électriquement, thermoconductrice, constituée notamment de Al¿2?O¿3?, qui permet de réduire les températures apparaissant dans le bâti. Les cavités des enroulements (24a) du stator peuvent en outre être remplies avec le matériau polymère contenant une charge thermoconductrice. L'amélioration de la dissipation de chaleur vers le liquide s'écoulant autour du moteur permet d'abaisser la température intérieure dans le moteur. Ce micromoteur s'utilise en particulier dans une pompe à sang intravasculaire.

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