Patent ID: 7671508
Filing Date: 2010-03-02
Classification: H02K

Abstract:
1. An alternator comprising: a rotor including a rotary shaft, a field core, and a field coil, the field core being fixed on the rotary shaft, the field coil being wound around the field core and having a first and a second end that are opposite to each other in an axial direction of the rotary shaft; a stator including an armature core and an armature coil, the armature core surrounding an outer periphery of the field core and having a first and a second end that are opposite to each other in the axial direction of the rotary shaft, the first end of the armature core being closer to the first end of the field coil than the second end of the field coil in the axial direction, the armature coil being wound around the armature core; and at least one cooling fan fixed on the rotary shaft so as to create a cooling air flow with rotation of the rotary shaft, wherein a distance between the first and second ends of the field coil is less than a distance between the first and second ends of the armature core in the axial direction of the rotary shaft, the first end of the field coil protrudes outward from the first end of the armature core in the axial direction of the rotary shaft, the field core has a first and a second end that are opposite to each other in the axial direction of the rotary shaft, the first end of the field core being closer to the first end of the field coil than the second end of the field coil in the axial direction, the armature coil has a first and a second end that protrude respectively from the first and second ends of the armature core in the axial direction of the rotary shaft, a distance between the first and second ends of the field core is less than a distance between the first and second ends of the armature coil in the axial direction of the rotary shaft, and the first end of the field core protrudes outward from the first end of the armature coil in the axial direction of the rotary shaft.