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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 having built-in voltage regulator
Ac generator having built-in voltage regulator
An ac generator for a vehicle includes a rotor having a field coil, a stator having a stator winding disposed around the rotor to provide ac power in cooperation with the rotor, a brush unit disposed near a rotation axis of the rotor, and a voltage regulator for controlling output voltage of the ac power. The voltage regulator has a regulator circuit section and a heat sink for dissipating heat generated by the regulator circuit section.
CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application 2003-172818, filed Jun. 18, 2003, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present ac generators relate to a brushless ac generator for a vehicle such as a passenger car or a truck.
2. Description of the Related Art
As disclosed in JP-A-85402, an ordinary voltage regulator that is mounted in an ac generator for a vehicle has a unitary molded body that includes a circuit board on which an IC chip or transistors are mounted, a heat sink that is fixed to the circuit board by a heat conductive cement and a male connector. Therefore, cooling air is guided by the cooling fins to flow in a radial direction toward the center axis of the ac generator. Because a brushless alternator of an ordinary ac generator for a vehicle, which has a pair of brushes, is disposed between the voltage regulator and the center axis, the brushes are exposed to the cooling air that has cooled the voltage regulator, or has been heated by the voltage regulator.
SUMMARY OF THE INVENTION
Therefore, a main object of the present invention is to provide an improved ac generator for a vehicle in which the brushes are not excessively heated.
According to a main feature of the invention, an ac alternator for a vehicle includes a rotor having a field coil, a stator having a stator winding and is disposed around the rotor, a brush unit disposed near a rotation axis of the rotor, a voltage regulator for controlling output voltage of the ac power. With the above structure, the voltage regulator has a regulator circuit section and a heat sink for dissipating heat generated by the regulator circuit section, and the heat sink has a plurality of axially projecting cooling fins that extends in a circumferential direction of the rotor.
An ac generator for a vehicle includes a rotor having a field coil, a stator having a stator winding disposed around the rotor to provide ac power in cooperation with the rotor, a brush unit disposed near a rotation axis of the rotor, and a voltage regulator for controlling output voltage of the ac power. The voltage regulator has a regulator circuit section and a heat sink for dissipating heat generated by the regulator circuit section.
CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Application 2003-172818, filed Jun. 18, 2003, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present ac generators relate to a brushless ac generator for a vehicle such as a passenger car or a truck.
2. Description of the Related Art
As disclosed in JP-A-85402, an ordinary voltage regulator that is mounted in an ac generator for a vehicle has a unitary molded body that includes a circuit board on which an IC chip or transistors are mounted, a heat sink that is fixed to the circuit board by a heat conductive cement and a male connector. Therefore, cooling air is guided by the cooling fins to flow in a radial direction toward the center axis of the ac generator. Because a brushless alternator of an ordinary ac generator for a vehicle, which has a pair of brushes, is disposed between the voltage regulator and the center axis, the brushes are exposed to the cooling air that has cooled the voltage regulator, or has been heated by the voltage regulator.
SUMMARY OF THE INVENTION
Therefore, a main object of the present invention is to provide an improved ac generator for a vehicle in which the brushes are not excessively heated.
According to a main feature of the invention, an ac alternator for a vehicle includes a rotor having a field coil, a stator having a stator winding and is disposed around the rotor, a brush unit disposed near a rotation axis of the rotor, a voltage regulator for controlling output voltage of the ac power. With the above structure, the voltage regulator has a regulator circuit section and a heat sink for dissipating heat generated by the regulator circuit section, and the heat sink has a plurality of axially projecting cooling fins that extends in a circumferential direction of the rotor.