Hybrid excitation synchronous generator with low cogging effect

Abstract

The invention discloses a hybrid excitation synchronous generator with low cogging effect, relates to synchronous generators and solves the problems that the traditional generator has the disadvantages of high starting resistance, poor starting performance and poor effect; and the problems that a small hybrid excitation synchronous generator has a thick size of a permanent magnet on a magnetic pole and a high magnetic motive force, which affect the adjustment effect of a voltage. The rotor of a motor of the invention adopts a split-pole structure, wherein a plurality of magnets are arranged on the surface of a pole yoke of the rotor; the polarity of the magnets is the same; the distance between the magnets is kept in a certain proportion; and non-guide magnetic space is arranged between two neighbouring magnets. The hybrid excitation synchronous generator of the invention can weaken or eliminate the cogging effect in the synchronous generator, improves a whole moment coefficient of a stator winding of the generator, reduces the starting resistance and the running noise of the generator, can increase the main magnetic flux of the hybrid excitation synchronous generator when an excitation current is increased, and improves the load characteristic of the generator.

Description

technical field [0001] The invention relates to an excitation synchronous generator, in particular to a composite excitation synchronous generator with super-strong load characteristics and small cogging effect. Background technique [0002] At present, my country's synchronous generators are widely used. In order to reduce volume and weight, permanent magnet synchronous generators and compound excitation generators combining electric excitation and permanent magnets are also increasing. In practice, it is found that there are many technical problems in the application of permanent magnet generators and compound excitation generators. For larger permanent magnet generators and compound excitation generators, the cogging problem is extremely obvious, and the starting resistance is very large, which directly affects the starting performance of the generator. Especially noticeable on wind turbines. At present, the method of using rotor skew poles, stator slant slots and stat...

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Problems solved by technology

[0003] The present invention solves the problem of the cogging effect of the existing relatively large permanent magnet generators and compound excitation generators, which is very obvious, and the starting resistance is very large, which directly affects the starting performance of the generator; and the effect of the existing method for solving the above problems is not is not significant; and the existing method also directly affects the integral moment coefficient of the stator winding of the synchronous generator; and for the small compound excitation synchronous generator, the permanent magnet is mostly used as the main excitation, and the size of the permanent magnet on the magnetic pole is very thick, and the magnetomotive force It greatly affects the voltage adjustment effect. The electric excitation is auxiliary excitation, the number of turns of the excitation winding is very small, and its load adjustment characteristics are far inferior to the traditional current excitation generator. A compound excitation synchronous generator with small cogging effect is provided. , the specific technical solution to solve this problem is as follows:

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