High frequency coupling excitation automobile generator

Abstract

The invention relates to an automobile generator which utilizes isolated coupling of a high-frequency transformer to realize brushless excitation, and represents a combination of the modern switch power technology and the motor technology. High-frequency current is coupled to a secondary coil rotating together with a rotor through a fixed primary coil, and the high-frequency current provides power for an exciting coil in the rotor after rectifying and wave-filtering. The simple and efficient excitation not only brings the advantage of a brushless generator to the invention, but also enables the invention to maintain the advantages of low speed, good charging performance and simple structure in a brush generator; in addition, the invention has more stable voltage output. By adopting the technology of the invention, a regular brush automobile generator can be improved into such a brushless generator through simple changes.

Description

[0001] Field: [0002] The invention belongs to the technical field of motors, in particular to an automobile generator which utilizes isolation coupling of a high-frequency transformer to realize brushless excitation. Background technique: [0003] Automobile generators can be divided into two types: brushed and brushless. Brushless generators have greatly improved reliability due to overcoming many disadvantages caused by brushes. At present, the most popular structure of the excitation magnetic circuit of the brushless automobile generator is to add two additional air gaps in the magnetic circuit, and the magnetic field is transmitted through these two additional air gaps. But it is precisely because of the existence of these two additional air gaps that the volume of the excitation current and the excitation coil will also increase due to the increase in the magnetic pressure drop compared with the brushed generator. In addition to being slightly larger, its low-speed cha...

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Problems solved by technology

But it is precisely because of the existence of these two additional air gaps that the volume of the excitation current and the excitation coil will also increase due to the increase in the magnetic pressure drop compared with the brushed generator. It is slightly larger and its low-speed charging performance is worse than that of a brushed generator

Moreover, the increased excitation current will inevitably be expressed in the form of heat, which increases the overall heat generation of the generator. In addition, the two claw poles of the rotor are welded together by non-magnetic materials. The welding process requires high requirements and is difficult. Larger, which limits the further increase of the generator's operating speed

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