The iron loss caused by cutting silicon steel sheet is evaluated by thermal measurement

Time：2024-06-29 Source： Hits：478

In modern industrial manufacturing, the motor as one of the core components, its performance directly affects the performance of the whole system. The heart of the motor, the iron core, is usually made of silicon steel. However, in the process of silicon steel processing, especially cutting processing, it will cause changes in the internal stress of the material, which will affect its magnetic properties, resulting in an increase in iron loss. The increase in iron loss not only reduces the efficiency of the motor, but also may shorten its service life. Therefore, evaluating and optimizing the processing method of silicon steel is an important topic in the motor manufacturing industry.

To address the above problems, researchers such as Takuma Sato of Oita University in Japan developed a thermal measurement based iron loss distribution evaluation system. The system uses a thermal imaging camera to capture the heat distribution of the silicon steel after processing, thus assessing the iron damage contactless. The principle is that the use of silicon steel in the magnetic loss process will be accompanied by heating phenomenon, so by measuring the degree of temperature rise, you can indirectly infer the size of the iron loss.

Two different Cutting methods were used in the study to process silicon steel samples: Wire EDM and Laser Cutting. The effects of different processing techniques on the properties of silicon steel sheet were evaluated by comparing the iron loss distribution after processing by these two methods.

The results show that the iron loss of the laser cut silicon steel sheet is obviously higher than that of the wire-cut sample. This finding is in line with expectations, as laser cutting may introduce more thermal effects and microstructure changes on the surface of the material, thereby increasing residual stress and reducing the material's permeability. The iron loss of the laser cut sample increased significantly near the cutting edge, which may be related to the heat affected area generated during the cutting process.

In addition, the magnetic flux density distribution of the sample was measured by the probe method to further analyze the reason for the increase in iron loss. The results show that the magnetic flux density of the laser cut sample decreases from the center of the sample to the edge of the cut, which is consistent with the changing trend of the iron loss distribution, which further confirms the negative effect of laser cutting on the magnetic properties of the silicon steel sheet. To better understand the composition of the iron loss, the research team also tried to separate the iron loss into hysteresis loss and eddy current loss, and analyzed their distribution at different frequencies. The results show that the hysteresis loss decreases from the central region to the cutting edge, while the eddy current loss increases.

This research provides important insights into the processing methods of silicon steel sheets and provides a valuable reference for motor design and manufacturing. Evaluating iron loss distribution through thermal measurement can not only help manufacturers optimize the machining process and reduce iron loss, but also improve the performance and reliability of the motor. Future research will further explore the effect of laser cutting on the internal state of the sample, and how to reduce the iron loss and improve the application performance of the silicon steel sheet by improving the processing technology.

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