AC generator having speed limit means

Details AC generator having speed limit means AC generator having speed limit means

1999-09-15

2001-08-28

Ponomarenko, Nicholas (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S078000, C310S263000

Reexamination Certificate

active

06281613

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Applications Hei 10-261237, filed Sep. 16, 1998, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an AC generator for a vehicle and, particularly, to an AC generator which has a device for limiting the rotation speed thereof.
2. Description of the Related Art
An AC generator disclosed in JP-A-9-107697 is provided with auxiliary permanent magnets between pole pieces in addition to a field coil so that a minimum output current can be generated even when the field coil is not energized. This AC generator has to have a bridge circuit composed of four switching element to increase the field current at lower rotation speeds and reduces the same at higher rotation speeds. However, this kind of bridge circuit is comparatively expensive and generates considerable heat. Accordingly, it is difficult to provide a compact AC generator having such a bridge circuit therein.
SUMMARY OF THE INVENTION
A main object of the invention is to provide an improved AC generator which solves the above problems.
According to a preferred embodiment of the invention, an AC generator includes a stator having a stator winding, a rotor having a field coil, a pulley for transmitting engine rotation to the rotor, a voltage regulator, and a clutch, disposed between the pulley and the rotor, for limiting rotation speed to be transmitted from the pulley to the rotor within a set rotation speed. The rotor also has a permanent magnet for supplying auxiliary magnetic flux to the stator winding. The permanent magnets generate lower output voltage than the terminal voltage of the battery when the field coil is not energized.
Preferably, the set rotation speed is between two third of the engine maximum speed and the engine idling speed.


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