Analysis of Tension Winding of High-Speed Permanent Magnet Motor Rotor with Magnetic Sleeve

In response to the problem of high centrifugal force generated by the rotor speed of high-speed permanent magnet motors, which leads to easy damage of permanent magnets. This paper proposes a topology structure of high-speed permanent magnet motor rotor containing composite magnetic sleeve to improve rotor strength while ensuring electromagnetic performance. A finite element winding simulation model was established using the equivalent temperature field method and the birth and death element method to study the stress distribution during the winding process of composite magnetic sleeve under the effect of stress relaxation. Based on this condition, the influence of different winding tensions and different magnetic particle ratios on the strength of the motor rotor was analyzed. The results indicate that composite magnetic sleeve can generate a certain pre-pressure on the permanent magnet, effectively protecting the structure of the permanent magnet by applying winding tension. As the winding tension increases, the stress on the permanent magnet gradually decreases. In addition, reducing the proportion of magnetic particles can improve the mechanical properties of composite magnetic sleeve, while also leading to a decrease in its magnetic properties. Therefore, it is necessary to comprehensively consider the factors of the proportion of magnetic particles.