Patent ID: 6476535
Filing Date: 2002-11-05
Classification: H02K

Abstract:
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 7Ã—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.