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<p>Induction motors with oval stators may lead to unbalanced magnetic pull (UMP), exerting an outward force on the rotor that tends to shift it away from the center. Coupled with rotor eccentricity, the effect of UMP gets aggravated. This can potentially result in rotor–stator rub, noise, excessive vibrations, and mechanical stresses, thereby affecting the motor’s performance. It is important to mitigate the effects of UMP in induction motors to ensure their safe operation. This work investigates the mitigation of UMP in an induction motor with stator ovality and dynamic rotor eccentricity using a specialized motor winding scheme known as bridge configured winding (BCW). Different types of oval stator profiles are considered, and the control ability of BCW is investigated using numerical simulation. To study the effect of the bridge ON condition of BCW on the UMP, the simulations are performed using a time-stepping finite element method code in MATLAB and compared for two cases—bridge OFF and ON conditions. The findings indicate that the bridge ON condition is highly effective in mitigating the undesirable components of UMP produced due to stator ovality and dynamic rotor eccentricity, underscoring the efficacy of BCW in UMP reduction.</p>

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Mitigation of Unbalanced Magnetic Pull in Induction Motor with Oval Stator and Dynamic Rotor Eccentricity Using Specialized Stator Winding

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Bipul Brahma,
  • Karuna Kalita,
  • Uday S. Dixit

摘要

Induction motors with oval stators may lead to unbalanced magnetic pull (UMP), exerting an outward force on the rotor that tends to shift it away from the center. Coupled with rotor eccentricity, the effect of UMP gets aggravated. This can potentially result in rotor–stator rub, noise, excessive vibrations, and mechanical stresses, thereby affecting the motor’s performance. It is important to mitigate the effects of UMP in induction motors to ensure their safe operation. This work investigates the mitigation of UMP in an induction motor with stator ovality and dynamic rotor eccentricity using a specialized motor winding scheme known as bridge configured winding (BCW). Different types of oval stator profiles are considered, and the control ability of BCW is investigated using numerical simulation. To study the effect of the bridge ON condition of BCW on the UMP, the simulations are performed using a time-stepping finite element method code in MATLAB and compared for two cases—bridge OFF and ON conditions. The findings indicate that the bridge ON condition is highly effective in mitigating the undesirable components of UMP produced due to stator ovality and dynamic rotor eccentricity, underscoring the efficacy of BCW in UMP reduction.