Permanent-magnet wind-driven generator capable of realizing self-acceleration of magnetic field

Abstract

The invention discloses a permanent-magnet wind-driven generator capable of realizing self-acceleration of a magnetic field. The generator comprises a rotor (1), an air gap (2) and a stator (3) which are arrayed coaxially from outside to inside, and the air gap (2) is reserved between the rotor (1) and the stator (3). The rotor (1) comprises a plurality of rotor cores (11) and rotor permanent magnets (12), wherein the rotor cores (11) are equidistantly arrayed at intervals, and each rotor permanent magnet (12) is embedded into each two adjacent rotor cores (11). The stator (3) comprises a stator yoke (31), a plurality of stator teeth (32) and multiphase symmetrical armature windings (33), wherein the stator yoke (31) is coaxial to the rotor (1), the stator teeth (32) project over the periphery of the stator yoke (31), a stator inter-tooth space is arranged between each two adjacent stator teeth (32), and the multiphase symmetrical armature windings (33) are embedded into the stator inter-tooth spaces. The permanent-magnet wind-driven generator realizes self-acceleration of the magnetic field by means of magnetic field modulating action of the stator teeth, a stator structure is simple, the armature windings are convenient to wind, the rotor is low-speed, high-torque and high in direct-driven capability, and accordingly the permanent-magnet wind-driven generator is applicable to the low-speed and high-torque fields of wind-driven generation and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy wind power generation, and relates to a permanent magnet wind power generator with a self-increasing function and suitable for direct drive or semi-direct drive occasions. Background technique [0002] In a wind power generation system, since wind energy is an energy source with low energy density, fans driven by wind energy generally work at relatively low speeds. In order to effectively utilize wind energy, the key is to reasonably match the speed of the fan and the speed of the generator. At present, two measures are mainly adopted: one is to use the mechanical speed-up gearbox as an intermediate link to increase the speed, so that the generator can work at a higher speed; The direct-drive wind power generation system is adopted, and the speed-up gear is canceled. There are some problems in the above two methods: the speed-increasing gear in the first method is not only bulky and heavy, but...

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Problems solved by technology

There are some problems in the above two methods: the speed-increasing gear in the first method is not only bulky and heavy, but also has a high failure rate and requires frequent maintenance, which is the weak link in the wind power generation system; in the second method, in order to ensure the output voltage and frequency In the normal range, generators that meet the requirements usually need to adopt larger stator and rotor diameters and more pole pairs, which are large in size and heavy in weight, which adds difficulties to the design, manufacture, transportation and installation of generators

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