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Abstract <p>A method is proposed to reduce losses due to induced currents and heating of permanent magnets in high-speed rotors of powerful synchronous machines with magnetoelectric excitation. To protect permanent magnets from centrifugal forces, a three-layer bandage system is proposed, which provides shielding of magnets from induced currents and magnetic retention using a main bandage made of VT22 titanium alloy and an additional high-strength electrical-insulation bandage made of carbon tape, which reduces the heating of the magnets. Calculation of the electromagnetic problem and losses for induced currents was performed using the finite element method in the COMSOL Multiphysics 6.2 software package. Calculation of magnet heating for various banding methods was performed using the proposed one-dimensional model of rotor heating using thermal equivalent circuits. Analysis of rotor heating from losses to induced currents in various methods of banding, including the classical method, as well as modern approaches, is carried out. The results of the analytical calculation of the two-dimensional rotor-heating problem are compared with the results of numerical simulation.</p>

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Methods of Rotor Banding to Reduce Losses on Induced Currents and Heating of Permanent Magnets of Powerful High-Speed Synchronous Generators

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • A. A. Kiryakin,
  • E. V. Shchetinin

摘要

Abstract

A method is proposed to reduce losses due to induced currents and heating of permanent magnets in high-speed rotors of powerful synchronous machines with magnetoelectric excitation. To protect permanent magnets from centrifugal forces, a three-layer bandage system is proposed, which provides shielding of magnets from induced currents and magnetic retention using a main bandage made of VT22 titanium alloy and an additional high-strength electrical-insulation bandage made of carbon tape, which reduces the heating of the magnets. Calculation of the electromagnetic problem and losses for induced currents was performed using the finite element method in the COMSOL Multiphysics 6.2 software package. Calculation of magnet heating for various banding methods was performed using the proposed one-dimensional model of rotor heating using thermal equivalent circuits. Analysis of rotor heating from losses to induced currents in various methods of banding, including the classical method, as well as modern approaches, is carried out. The results of the analytical calculation of the two-dimensional rotor-heating problem are compared with the results of numerical simulation.