Practical Verification of the Approximation Method of the Influence of Guillotine and Laser Cutting and Core Dimensions on Losses and Magnetization of Induction Motor Cores

Induction motors are a significant consumer of electricity. One of the crucial elements of losses in an induction motor is core losses. Core losses become dominant in motors powered by an inverter at higher frequencies. The core sheet loss depends on cutting the core using a die or laser. The article presents a practical method for approximating loss characteristics, enabling the determination of losses with high accuracy and the approximation of the magnetization characteristic. The method’s accuracy was verified using sheet metal samples cut with both a guillotine and a laser. The method is an area method; therefore, it is well-suited for use in analytical methods and calculations of power losses based on FEM (Finite Element Method) post-processing. Then, the developed approximations were used to calculate losses in sample induction motors of different powers. The results indicate that the developed method is accurate, making it a viable alternative to the approximate correction factor.