Rotor magnetism gathering type two-stator field modulation permanent magnet generator

Abstract

The invention discloses a rotor magnetism gathering type two-stator field modulation permanent magnet generator, which sequentially comprises an outer stator (1), a rotor (3) and an inner stator (5) which are coaxial from outside to inside, wherein an outer air gap (2) is arranged between the outer stator (1) and the rotor (3), and an inner air gap (4) is arranged between the rotor (3) and the inner stator (5); the outer stator (1) comprises an outer stator yoke (11), outer stator teeth (12) which protrude from the inner surface of the outer stator yoke to the axis direction, and an outer stator armature winding (13) embedded into outer stator grooves arranged between the adjacent outer stator teeth (12), and the rotor (3) comprises a rotor core (31) and uniformly distributed rotor permanent magnets (32) embedded into the rotor core; and the inner stator (5) comprises an inner stator yoke (51), inner stator teeth (52), inner stator grooves, and an inner stator armature winding (53) embedded into the inner stator grooves. The two-stator structure provided by the invention can improve the space utilization rate and reduce the magnetic flux leakage of a magnetism gathering structure.

Description

technical field [0001] The invention belongs to the technical field of power generation, and relates to a double-stator permanent magnet generator with a magnetic field modulation function and suitable for direct drive applications. Background technique [0002] In a wind power generation system, since wind energy is an energy source with a low energy density, wind turbines driven by wind energy generally work at low speeds. In order to effectively utilize wind energy and match the speed of wind turbines and generators, two measures are currently used. One is to use a mechanical speed-up gearbox for speed-up, but the speed-up gear is bulky, heavy, and has a high failure rate; the other is to cancel the speed-up gear and use a direct-drive wind power generation system. However, in order to ensure the output voltage and frequency Within the normal range, this type of generator needs to adopt a larger stator and rotor diameter and a larger number of pole pairs, which is bulky a...

AI Technical Summary

Problems solved by technology

One is to use a mechanical speed-up gearbox for speed-up, but the speed-up gear is bulky, heavy, and has a high failure rate; the other is to cancel the speed-up gear and use a direct-drive wind power generation system. However, in order to ensure the output voltage and frequency Within the normal range, this type of generator needs to adopt a larger stator and rotor diameter and more pole pairs, which is bulky and difficult to design, transport and install.

Moreover, due to changes in wind speed, the direct-drive single-stator wind turbine has the problem of large output voltage fluctuations

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