Improvements in high speed electric motors

Details Improvements in high speed electric motors Improvements in high speed electric motors

H - Electricity

02

K

H02K 1/27 (2006.01) H02K 7/09 (2006.01) H02K 15/03 (2006.01) H02P 7/06 (2006.01) H02K 21/14 (2006.01) H02K 29/00 (2006.01)

Patent

CA 2278581

A high speed, brushless, DC motor has a rotor (10) comprising a solid rare earth magnet core (17) magnestised diametrically. The rotor (16) includes a sleeve (18) surrounding the magnet core (17) to radially constrain the core during high speed rotation thereof. The sleeve (18) extends axially in both directions from the core to form a hollow shaft for the rotor (16). The sleeve (18) is formed of non-magnetic, low electrical conductivity material. Control circuity (14) is provided including an electronic inverter of a predetermined rating, the control circuity including means to maintain substantially constant power through the range of motor speeds from a base speed to a maximum speed while maintaining a power factor close to 1.

Moteur à courant continu très rapide sans balais possédant un rotor (10) comprenant un noyau magnétique plein (17) des terres rares magnétisé diamétralement. Ce rotor (16) comprend un manchon (18) entourant le noyau magnétique (17) afin d'exercer une contrainte radiale sur ledit noyau pendant sa rotation à vitesse élevée. Ce manchon (18) s'étend axialement dans les deux sens depuis le noyau, de manière à constituer un arbre creux pour le rotor (16). Ce manchon (18) est constitué par un matériau non magnétique peu conducteur électriquement. Un circuit de commande (14) comprend un onduleur électronique de calibre prédéterminé, ainsi que des moyens servant à maintenir une constance sensible d'énergie à travers la plage des vitesses du moteur depuis une vitesse de base jusqu'à une vitesse maximum, tout en conservant un facteur de puissance proche de un.

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