A.c. generator for vehicle
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsAtsushi Oohashi, Yoshihito Asao
Life of this patent
Estimating the term…
Abstract
A chamfered portion 100 on three points, being a point B formed on a peripheral end surface of a root shoulder portion of magnetic pole pieces 8a or 9a and being on a line, from which a taper formed on an outer peripheral surface of the root shoulder portion starts, a point C on a skew slanted portion of the magnetic pole pieces 8a and 9a, and a point A on the peripheral end surface of the magnetic pole pieces 8a or 9a apart from an end surface of a stator core 4 by a distance between L1/4 and 7×L1/8, is formed in the magnetic pole piece of an a.c. generator for vehicle, whereby noises such as wind noise and electromagnetic sound can be reduced, a magnetic circuit of a rotor is improved, the amount of magnetic flux is increased, whereby an output becomes high.
Claims19
An a.c. generator for vehicle comprising:
- a stator core having a stator coil;
- a first rotor core, fixed to a rotational shaft inside an inner diameter of the stator core;
- a second rotor core, fixed to the rotational shaft inside the inner diameter of the stator core;
- a field magnetic coil for magnetizing the first rotor core and the second rotor core;
- and
- a plurality of first magnetic pole pieces and a plurality of second magnetic pole pieces, which respectively protrudes from the first rotor core and the second rotor core in an axis direction of the rotational shaft so as to mutually engage with a predetermined gap and to be opposite to the inner diameter of the stator core with a predetermined gap,
- wherein at least the first magnetic pole pieces or the second magnetic pole pieces has chamfered portions, formed by a surface on three points, being a point on a most outer periphery of a root shoulder portion and on a taper continuing from the most outer periphery toward an outer side of the generator in the axis direction to an end surface of the stator core, a point on a skew slanted portion of the magnetic pole piece, and a point on a surface of the magnetic pole piece apart from the end surface of the stator core by a distance between L1/4 and 7×L1/8 in the axis direction, where L1 is a distance between a root end surface of the magnetic pole piece and the end surface of the stator core.
Dependencies are inferred from the claim text.