Suzhou Firstall Electric Machine & Technology Co.,Ltd.

Field of the ac generator
The present invention relates to an ac generator that has a rotor having a plurality of claw-shaped pole pieces and a field coil held inside the pole pieces.
Description of the ac generator
It has been found that the magnetic noise of brushless ac generator is caused by the third harmonic wave of magnetic flux that is distorted during operation. In order to reshape the waveform of the magnetic flux into a sine wave, JP-B2-61-11066 proposes an ac generator in which a rotor has scalene trapezoidal claw-shaped pole pieces. That is, the surface of the pole pieces has a trapezoidal shape that is asymmetrical with respect to the center line of the pole piece that is perpendicular to the rotation direction of the rotor.
Summary of the ac generator
Therefore, an object of the invention is to provide a powerful and noiseless ac generators.
One of the main disadvantages of AC generators is that the motor must have high level of current flowing throughout the revolving contacts. This can create sparks and heat, of which, dissipates energy and can cut down the lifespan of the motor. Most of the turbines of AC generate magnetic field created by an “electromagnet”. The electromagnet is powered by the same alternating current voltage as the coils of the motor. The coils that generate the magnetic field are commonly known as “stator”. Whereas the coils and the solid focal point of the motor that revolves are known as the “armature”. The AC generator’s motor have sinusoidally fluctuating magnetic fields, at the same time as the flow in the coil fluctuates.