Brushless ac generator for vehicle
AssigneeMitsubishi Electric Corporation
InventorHideyuki Hayashi
Life of this patent
Estimating the term…
Abstract
To provide a brushless AC generator for a vehicle, which is capable of improving a cooing performance for an excitation coil and increasing an output of electric power generation with a simple structure. An external fan 11 fixed to a shaft 10 outside the brackets 5 and 6 and an internal fan 34 fixed to a rotor assembled body 21 formed from a first rotor pole 22 and a second rotor pole 23 united into one body, the internal fan 34 having fan blade 34a provided in a valley part 22b between claw poles 22a of the first rotor pole 22, are provided. The external fan 11 and the internal fan 34 are used to generate an air flow for cooling a stator core 3, the rotor assembled body 21, an excitation core 31 and an excitation coil 33.
Claims4
A brushless AC generator for a vehicle comprising:
- a pair of brackets for holding a shaft through bearings;
- a stator core having a stator coil held between the brackets;
- a rotor assembled body fixed to the shaft so as to be faced to the stator core, the rotor assembled body being formed into the shape of a cylinder from a first rotor pole having plural claw poles in a circumferential direction at even intervals and a second rotor pole having plural claw poles provided between the former plural claw poles in a circumferential direction at even intervals, the first and second rotor poles being united into one body;
- a cylindrical excitation core provided in the rotor assembled body and fixed to an inner surface of the bracket;
- an excitation coil wound around the excitation core;
- an external fan fixed to a shaft outside the bracket;
- and
- an internal fan fixed to the rotor assembled body, the internal fan having fan blade provided in a valley part between the claw poles of the first rotor pole,
- the brushless AC generator for a vehicle characterized in that
- interaction of the external fan with the internal fan is achieved to generate an air flow passing from one of the pair of brackets to the other in the same direction and the airflow is used for cooling at least the stator core, the rotor assembled body, the excitation core and the excitation coil.
Dependencies are inferred from the claim text.