Permanent magnet motor or actuator with field weakening...

H - Electricity – 02 – K

Patent

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Details

H02K 16/02 (2006.01) H02K 1/27 (2006.01)

Patent

CA 2713575

The present disclosure relates generally to a permanent magnet, brushless motor comprising a primary rotor having alternating magnetic poles around a circumference, a secondary rotor similar to the primary rotor. The primary rotor may be free to rotate by approximately plus or minus one pole of the secondary rotor. As such, when the two rotor components have opposite polarities aligned, the motor may be in a field weakened state. Generally, the field weakened state may be the normal state of the motor. As a significant load is encountered, the rotors may automatically transition to a non-weakened state wherein similar polarities are aligned on the rotors. A permanent magnet, brushless motor as described herein may be employed at a motor level or integrated into a linear actuator, wherein the rotor of the permanent magnet, brushless motor may include a hollow shaft.

D'une manière générale, la présente invention concerne un aimant permanent, un moteur sans balais comportant un rotor primaire comprenant des pôles magnétiques autour d'une circonférence, un rotor secondaire identique au rotor primaire. Le rotor primaire peut être à rotation libre par environ un pôle de plus ou de moins du rotor secondaire. Ainsi, lorsque des deux composants de rotor ont des polarités opposées alignées, le moteur peut être dans un état de champ affaibli. D'une manière générale, l'état de champ affaibli peut être l'état normal du moteur. Lors de la survenance d'une charge importante, les rotors peuvent automatiquement effectuer une transition vers un état non affaibli dans lequel des polarités identiques sont alignées sur les rotors. Un aimant permanent, un moteur sans balais selon la présente invention peuvent être utilisés au niveau d'un moteur ou intégré dans un actionneur linéaire, le rotor de l'aimant permanent, le moteur sans balais pouvant comprendre un arbre creux.

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