Self-aligning rotor assembly

H - Electricity – 02 – K

Patent

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Details

H02K 3/52 (2006.01) H02K 1/24 (2006.01)

Patent

CA 2202163

An alternator rotor assembly comprises two "claw pole" pole pieces (12, 14) and a field coil assembly (28) mounted between the pole pieces for rotation therewith. The field coil assembly comprises a bobbin (30) and a coil of wire (32) wound around the body of the bobbin. The bobbin further comprises two walls (34, 36) extending radially away from the body of the bobbin, between which the coil wire is wound. Projecting from the walls are flaps (38, 40, 42, 44) which extend radially outward. The flaps are designed to be bent over by the pole fingers (16, 18, 20, 22) as the rotor assembly is assembled. When so bent over, the flaps help retain the coil wire (32) on the bobbin and help prevent short-circuiting of the coil wire to the inner radius defined by the pole fingers. The ends of the flaps have notches (50, 52) that assist in self- alignment.

Ensemble rotor d'un alternateur comprenant deux pièces polaires (12, 14) du type "pôles à griffes", ainsi qu'un ensemble bobine d'excitation (28) monté entre les pièces polaires afin de tourner avec celles-ci. L'ensemble bobine d'excitation comprend une bobine (30) ainsi qu'une couronne de fil métallique (32) enroulé autour du corps de la bobine. La bobine comprend en outre deux parois (34, 36) s'éloignant radialement du corps de celle-ci et entre lesquelles le fil est enroulé. Des pattes (38, 40, 42, 44) saillent de ces parois en s'étendant radialement vers l'extérieur et elles sont conçues pour être repliées sur les griffes (16, 18, 20, 22) des pôles lors de l'assemblage du rotor. Lorsqu'elles sont ainsi repliées, les pattes aident à retenir le fil (32) sur la bobine et à empêcher la mise en court-circuit du fil de la bobine vers le rayon interne déterminé par les griffes du pôle. Les extrémités des pattes possèdent des encoches (50, 52) facilitant l'alignement automatique des pattes.

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