Birotor permanent magnet motor applied to wind power generation

Abstract

The invention discloses a birotor permanent magnet motor applied to wind power generation. Rotors of the birotor permanent magnet motor comprise an inner rotor and an outer rotor. A stator comprises a stator core and a stator winding, wherein the inner rotor and the outer rotor share the stator, and the stator winding is wound on the stator core. The inner rotor is arranged inside the stator, an inner air gap is formed between the inner rotor and the stator, and the inner rotor comprises an inner rotor permanent magnet and an inner rotor core. The outer rotor is arranged outside the stator, an outer air gap is formed between the outer rotor and the stator, and the outer rotor comprises an outer rotor core and an outer rotor permanent magnet of which the surface is attached to the inner surface of the outer rotor core. The inner rotor and the outer rotor are fixedly connected and rotate synchronously. The magnetizing direction of the inner rotor permanent magnet and the magnetizing direction of the outer rotor permanent magnet are opposite. An inner magnetic circuit and an outer magnetic circuit are parallel and are closed through the stator core shared by the inner magnetic circuit and the outer magnetic circuit. The back-to-back annular winding can effectively reduce copper loss of the motor, enlarge an effective air gap area of the motor, and strengthen power generation capacity of a wind driven generator at a low wind speed.

Description

technical field [0001] The invention relates to a double-rotor permanent magnet generator, which belongs to the technical field of new energy wind power generation. Background technique [0002] With the massive consumption of fossil energy and the rapid growth of economy and population, the shortage of energy and the deterioration of the environment are becoming more and more serious, which has greatly promoted the development and application of renewable energy power generation technologies in countries all over the world. As one of the cleanest renewable energy sources, wind energy has attracted more and more attention from all countries in the world due to its inherent advantages in storage capacity, distribution area and pollution, and has become the fastest-growing green new energy. [0003] In the existing mainstream variable-speed constant-frequency wind power generation system, the double-fed generator set can directly output constant-frequency three-phase alternati...

AI Technical Summary

Problems solved by technology

However, this kind of wind turbine system is relatively complicated. In order to reduce the capacity of the excitation converter, an AC excitation capacitor group is added to the power winding, and in order to improve the current waveform and improve the efficiency of power generation, a bulky filter inductor is added to the control winding side. The operational reliability of the entire unit and the engineering practice of the unit have not been further studied and verified

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