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Suzhou Firstall Electrical Machine & Technology Co., Ltd. is a leading Supplier of professional-quality power alternators/generators, Brushless Synchronous AC Alternator , ac generator ,as well as professional service on international trade. FIRSTALL markets its products and service its partner around the world from the office located in Suzhou and Wuxi city Jiangsu province, China.
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AC generator for vehicle
AC generator for vehicle
An AC generator has negative pole-side rectifier devices press-fitted to a holder fin so as to dispose a bottom face of the rectifier device on a surface of the holder fin. The holder fin is disposed in such a manner that the bottom face of the rectifier device faces a rear frame of the AC alternator. A clearance is formed between the rear frame and the bottom face through which the cooling wind for the rectifier device flows. The rear frame is provided with a slant face on its outer wall face for inducing the cooling wind introduced through an opening of the protection cover of the AC generators to the rectifier devices. Thus, the cooling wind induced by the slant face can hit on the bottom face of the rectifier devices directly, so as to cool the rectifier device well.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority of Japanese Patent Application No. 2004-94918 filed on Mar. 29, 2004, the contents of which are incorporated herein by reference.
FIELD OF THE INVENTION
The present invention relates to an AC generator for vehicles, especially relates to a brushless AC alternator targeting on an improvement of cooling performance for a rectifier located therein.
BACKGROUND OF THE INVENTION
Currently, a large power output is demanded for brushless alternator
for vehicle, making a key issue in improving a cooling ability for a rectifier located therein, which generates a large amount of heat by a large current flowing therethrough. It is considered to raise an ability of fans for cooling the rectifier, however, this increases a noise of the fans. Thus, to secure a vehicular compartment against noise, it is not always appropriate to raise the cooling ability of the fans.
SUMMARY OF THE INVENTION
The present invention is achieved in view of the above issues, and its object is to provide an AC generator for a vehicle that has a high cooling ability for the rectifier device without raising an ability of a cooling fan and that can efficiently discharge muddy water intruded inside of a protection cover.
To achieve the above object, an AC generator for a vehicle of the present invention has a rotor, a frame having a slant face, a cooling fan, a protection cover and a rectifier.
An AC generator has negative pole-side rectifier devices press-fitted to a holder fin so as to dispose a bottom face of the rectifier device on a surface of the holder fin. The holder fin is disposed in such a manner that the bottom face of the rectifier device faces a rear frame of the AC alternator. A clearance is formed between the rear frame and the bottom face through which the cooling wind for the rectifier device flows. The rear frame is provided with a slant face on its outer wall face for inducing the cooling wind introduced through an opening of the protection cover of the AC generators to the rectifier devices. Thus, the cooling wind induced by the slant face can hit on the bottom face of the rectifier devices directly, so as to cool the rectifier device well.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority of Japanese Patent Application No. 2004-94918 filed on Mar. 29, 2004, the contents of which are incorporated herein by reference.
FIELD OF THE INVENTION
The present invention relates to an AC generator for vehicles, especially relates to a brushless AC alternator targeting on an improvement of cooling performance for a rectifier located therein.
BACKGROUND OF THE INVENTION
Currently, a large power output is demanded for brushless alternator
for vehicle, making a key issue in improving a cooling ability for a rectifier located therein, which generates a large amount of heat by a large current flowing therethrough. It is considered to raise an ability of fans for cooling the rectifier, however, this increases a noise of the fans. Thus, to secure a vehicular compartment against noise, it is not always appropriate to raise the cooling ability of the fans.
SUMMARY OF THE INVENTION
The present invention is achieved in view of the above issues, and its object is to provide an AC generator for a vehicle that has a high cooling ability for the rectifier device without raising an ability of a cooling fan and that can efficiently discharge muddy water intruded inside of a protection cover.
To achieve the above object, an AC generator for a vehicle of the present invention has a rotor, a frame having a slant face, a cooling fan, a protection cover and a rectifier.