Hitachi, Ltd.

Wasei Horioka

Shinji Yamazaki

Susumu Tajima

Masami Takano

Shin Onose

Masahiko Honma

Susumu Terumoto

Mitsuaki Izumi

The invention concerns with connection of a lead from an electrical component of an alternator for a vehicle, and provides a terminal shape suitable for TIG welding (arc welding using a gas shielded non-consumable electrode) without being affected by dimensional accuracy of terminals to be connected to each other. Cross-shaped projections having a larger volume than a welded region of the terminal is provided near the welded region, and weld penetration (welding depth) is controlled based on a difference in heat capacity resulting from the volume difference, or melting is suppressed with promotion of heat radiation. Thus, the welding depth is stabilized without being affected by dimensional accuracy of the terminals including relative positions between them, and an alternator for a vehicle can be provided in which a lead from an electrical component has high connection reliability.

Weld joining portion of a vehicle alternator

The rotor of a vehicle alternator can firmly fasten the permanent magnets between claw-shaped magnetic poles. The rotor includes a Lundell type iron core having claw-shaped magnetic poles which are alternately arranged and opposed each other and include a centered cylindrical field winding, and a permanent magnet disposed between the claw-shaped magnetic poles for increasing the magnetic field. The permanent magnet is held by radial elastic force.

Vehicle alternator and its rotor

An automotive alternator comprises: a stator provided with a stator coil; a rotor supported for rotation in the stator to apply an alternative magnetic field to the stator; a regulator for regulating output; a rectifier for rectifying generated current; a plurality of housings holding the stator and the rotor; and a coolant path through which a coolant flows through at least one of the plurality of housings to transfer heat generated in the stator coil outside the automotive alternator. Fastening devices formed of a material having good heat conductance fasten the regulator and a heatsink for the regulator together to the housing at a position apart from the housing to transfer heat generated by the regulator to the housing. Thus, the automotive alternator can maintain a stable cooling ability in a hot atmosphere for a long time.

Alternator for vehicle

Growing community of inventors

Hitachinaka, Japan

Wasei Horioka