Novel permanent-magnet rotor magnetic pole structure of permanent-magnet wind-driven generator

Abstract

The invention discloses a novel permanent-magnet rotor magnetic pole structure of a permanent-magnet wind-driven generator. The structure is used for a permanent-magnet embedded salient pole generator. The structure comprises a stator core, a rotor magnetic pole and a rotor yoke, and is characterized in that the rotor magnetic poles adopt a salient pole type magnetic pole structure with an arc-shaped iron yoke outer frame; a permanent magnet in the rotor magnetic pole is divided into three sections to form a U-shaped magnetic gathering structure, and a plurality of magnetic bridges are arranged at the upper part of the rotor yoke and used for adjusting a magnetic circuit and optimizing an inductance characteristic. The structure has the advantages that the permanent magnet with the uniqueU-shaped structure enables the adjustable angle of the permanent magnet to be larger, the magnetism gathering capacity is superior to that of a common built-in permanent magnet motor; therefore, the consumption of a permanent magnet material is low under the same power, and the production cost is saved; the maximum output power of the structure is larger than that of a traditional built-in permanent magnet structure.

Description

technical field [0001] The invention relates to a novel permanent magnet rotor magnetic pole structure of a permanent magnet wind generator, belonging to the technical field of permanent magnet motor magnetic poles. Background technique [0002] In recent years, with the rapid development of offshore wind farms, in order to reduce the maintenance cost of wind farms, people have researched and developed high-reliability generators. In humidity and salt spray environments, the built-in permanent magnet (IPM) generator protects the permanent magnets better than the surface-mounted permanent magnet synchronous generator. In the traditional design scheme, the "one"-shaped or V-shaped permanent magnet non-salient pole structure is often used. However, with this type of permanent magnet wind turbine structure, there are some problems that need to be solved: because the built-in permanent magnet motor is smaller than the surface mount The magnetic leakage phenomenon of the type per...

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Problems solved by technology

In the traditional design scheme, "one" or V-shaped permanent magnet non-salient pole structure is often used. However, there are some problems that need to be solved when using this type of permanent magnet wind turbine structure: because the built-in permanent magnet motor is more powerful than the surface-mounted The flux leakage phenomenon of the type permanent magnet motor is more serious. To a certain extent, the permanent magnet material used by the same power motor is more than that of the surface mount type, so the manufacturing cost is higher; its quadrature axis inductance is greater than the direct axis inductance, so that the generator The total electromagnetic output power is reduced; the traditional built-in ventilation and heat dissipation are poor, and the permanent magnet may suffer from irreversible demagnetization at high temperature, etc.

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