High-power permanent magnet synchronous generator

Abstract

The invention provides a high-power permanent magnet synchronous generator, which aims to solve the problem that permanent magnets of a rotor of the high-power permanent magnet synchronous generator with a surface-mounted permanent magnet structure may easily produce partial permanent demagnetization due to a demagnetized field produced under the conditions of overload running, sudden short circuiting and the like. At least an auxiliary mechanism is arranged on the rotor of the generator, and weakens demagnetized field intensity at positions, axially clinging to the two edges of a rotor core along the generator, of two adjacent permanent magnets. The high-power permanent magnet synchronous generator avoids the permanent demagnetization of the permanent magnets of the rotor under the abnormal running conditions of overload running, sudden short circuiting and the like of the generator, so the magnetic energy product of the permanent magnets is ensured, and simultaneously, the service life of the generator is prolonged.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous generators, in particular to a high-power permanent magnet synchronous generator whose rotor adopts a surface-mounted permanent magnet structure. Background technique [0002] Permanent magnet motors have the advantages of low loss and high efficiency, and are used more and more widely today when energy conservation and environmental protection are increasingly valued. For applications such as fans, pumps, compressors, etc. that operate at a continuous, constant speed and in one direction, ordinary asynchronous motors are gradually being replaced by permanent magnet motors due to the waste of electric energy caused by efficiency, power factor and other reasons. At the same time, the operating speed of many industrial machines needs to be set and adjusted arbitrarily, but the accuracy of speed control is not high. Due to the advantages of small size, high efficiency and energy ...

AI Technical Summary

Problems solved by technology

Increasing the length of the air gap is to weaken the demagnetization flux generated by the generator overload operation, sudden short circuit, etc., but it will inevitably weaken the back EMF, output power and other performance of the generator; increasing the thickness of the permanent magnet is to improve the performance of the permanent magnet. In order to improve the anti-demagnetization ability of the permanent magnets, but it will inevitably increase the amount of permanent magnets, which will increase the cost of the generator and increase the volume of the generator

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