Gear quality is one of the factors that determine the stability of the wind turbine. Electromagnetic heating is a green and efficient heating method, which has been used to heat wind power gears. Good mechanical properties could be obtained by induction hardening on the surface of wind power gears. And a uniform hardened layer along the tooth profile is needed. In this paper, research on the effect of the Magnetic Flux Concentrator (MFC) in gap-to-gap induction heating of wind power gear was carried out. The study and the experimental tests refer to the heat treatment of an inner gear ring of a wind turbine transmission of modulus m = 16 at frequency 6000 Hz. The calculated hardened depth is 3 mm inward from the side of the tooth profile, and reaches 2 mm at root of the tooth. The mechanism of the concentrator, and the relationship between MFC characteristics and the heating results are explored. The study found the heating time and quality could be significantly affected by the geometrical dimensions thickness "t", height "h" and material of the MFC. The Magnetocaloric Capacity "Mc" was proposed to describe the ability of the MFC to influence the heating process. The characteristics of the magnetic flux concentrator that affect the heating quality and efficiency are discussed. Meanwhile, this study found that the heating efficiency is related to the strength of the magnetic field in the MFC and the distribution of magnetic field lines. By adjusting t, h and the materials, the heating efficiency and quality could be significantly changed. The maximum temperature difference along the tooth contour was changed to 39.6%, and the average temperature was changed to 6%. When the relative permeability of the material is matched with the frequency, a better heating quality and higher speed could be obtained. The research provides a theoretical support for the precise control of the gap-by-gap induction heating of wind power gear, especially for quality control by the MFC.

齿轮质量是决定风力涡轮机稳定性的因素之一。电磁加热是一种绿色高效的加热方法，已用于加热风力发电齿轮。通过在风力发电齿轮的表面进行感应淬火可以获得良好的机械性能。并且沿着牙齿轮廓需要均匀的硬化层。本文研究了磁通量集中器（MFC）在风力发电机齿轮间隙感应加热中的作用。该研究和实验测试涉及在频率6000 Hz下对模数为m = 16的风力涡轮机变速器的内齿圈进行热处理。计算出的硬化深度是从齿廓侧面向内3毫米，在齿根处达到2毫米。集中器的机制，探讨了MFC特性与加热效果之间的关系。研究发现，加热时间和质量可能会受到几何尺寸厚度的显着影响。MFC的t ”，高度“ h ”和材料。提出了磁热容量“ Mc ”来描述MFC影响加热过程的能力，并讨论了磁通量集中器的特性对加热质量和效率的影响。同时，本研究发现，加热效率有关，在MFC和磁力线分布的磁场的强度。通过调整吨，ħ并且材料，加热效率和质量可能会发生重大变化。沿牙齿轮廓的最大温差更改为39.6％，平均温度更改为6％。当材料的相对磁导率与频率匹配时，可以获得更好的加热质量和更高的速度。该研究为精确控制风力发电齿轮的间隙感应加热提供了理论支持，尤其是通过MFC进行质量控制。