NdFeB permanent magnet temperature compensation material for wind power generator or permanent magnet motor

Abstract

The invention discloses a neodymium iron boron permanent magnet temperature compensation material for a wind driven generator or a permanent magnetic engine. The neodymium iron boron permanent magnet temperature compensation material is characterized in that the material comprises a neodymium iron boron permanent magnet body,and a metal shell coats the neodymium iron boron permanent magnet body and is composed of 60-75% of Fe and 25-40% of Ni. The neodymium iron boron permanent magnet temperature compensation material has the advantages that magnetic stability and freeness of demagnetizing of a permanent magnet in high-temperature environment can be effectively ensured to maintain continuous power generating capacity of the wind driven generator, the material is little in environment pollution and simple to process, and cost is lowered.

Description

technical field [0001] The invention relates to the technical field of wind power generators, in particular to a temperature compensation material for NdFeB permanent magnets for wind power generators or permanent magnet motors, or temperature-compensated NdFeB permanent magnets for wind power generators or permanent magnet motors. Background technique [0002] The NdFeB permanent magnets used in wind turbines or permanent magnet motors are required to have good magnetic stability due to the harsh environment of use, and they will not demagnetize in high temperature environments to maintain the continuous power generation capacity of wind turbines. [0003] For the permanent magnets in the prior art, due to the long-term power generation process, the temperature will gradually increase, even to a high temperature of 80-100°C. The permanent magnets currently used in such a high-temperature environment have a large decrease in magnetic properties, so that Seriously affect the ...

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Problems solved by technology

[0003] For the permanent magnets in the prior art, due to the long-term power generation process, the temperature will gradually increase, even to a high temperature of 80-100°C. The permanent magnets currently used in such a high-temperature environment have a large decrease in magnetic properties, so that Seriously affect the stability of wind turbine operation and reduce power generation

[0004] In addition, the NdFeB permanent magnets currently used in wind turbines are often coated with a single metal protective layer on the outer surface of the NdFeB permanent magnets by electrochemical plating to prevent corrosion or scratches on the surface of the permanent magnets. However, this process often has the following disadvantages: 1. Due to the large pollution in the chemical plating process and the discharge of heavy metal waste liquid, it has a huge impact and damage to the environment; 2. The chemical plating process consumes a lot of electricity and energy, which greatly improves Production cost; 3. Since a layer of metal protective layer is coated on the outer surface of the NdFeB permanent magnet, the hardness and strength of the metal protective layer are not ideal, and the defect of surface scratches will still be caused. Repeated electroplating or removal of electroplating layer and rework and reprocessing, the whole process is complicated and difficult to handle, which greatly increases the cost of the enterprise

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