High-capacity low-speed permanent-magnet wind-driven generator

Abstract

The invention relates to a high-capacity low-speed permanent-magnet wind-driven generator. According to the generator, multiple three-phase windings are used and integer slots are centralized to improve the coefficient of the windings and the utilization ratio of an iron core; the number of in-series turns per phase of the armature winding is increased to reduce the axial length of the iron core of a motor; and a permanent-magnet pole is dislocated or skewed to reduce tooth harmonic and pulsating torque. On the premise of ensuring that the electromagnetic performance of the generator and the complexity of the motor manufacturing process meet the requirements, the invention realizes material saving of the permanent magnet in the high-capacity low-speed permanent-magnet wind-driven generator, effectively reduces the cost of the motor, and provides directions for the popularization and application of the high-capacity low-speed permanent-magnet wind-driven generator.

Description

technical field [0001] The invention relates to a wind power generator, in particular to a large-capacity low-speed permanent magnet wind power generator. Background technique [0002] Compared with the traditional electric excitation synchronous generator, the permanent magnet generator cancels the rotor excitation winding, so the rotor loss is less and the efficiency is greatly improved. In addition, the permanent magnet generator can easily reduce the number of stages of the speed-up gearbox or even cancel the speed-up gearbox between the fan blade and the motor by designing a multi-pole, which not only improves the transmission efficiency of the entire system but also ensures the reliability of the system. Therefore, The research on low-speed permanent magnet synchronous wind turbine has become a hot topic in current wind power generation projects. [0003] In practical applications, on the one hand, with the limitation of rare earth and other raw material resources, th...

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Problems solved by technology

[0003] In practical applications, on the one hand, with the limitation of rare earth and other raw material resources, the price of permanent magnets used as raw materials for motors in permanent magnet generators continues to rise, which greatly increases the cost of motors, which seriously restricts the use of permanent magnet motors. develop

On the other hand, the existing low-speed permanent magnet generators mostly use fractional slot windings to reduce the pulsating torque and avoid the increased process complexity of the inclined slots, but the winding coefficient of the armature winding is low and the amount of permanent magnet materials is large. And with the continuous increase in the power of permanent magnet motors, it is difficult for traditional three-phase windings to match the corresponding power electronic converters

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