Unbalanced Magnetic Force Mitigation and Torque Ripple Reduction in Eccentric Switched Reluctance Motors Using Flux Leakages

Tavakoli, Mohammad Reza; Torkaman, Hossein; Faradjizadeh, F.; Afjei, E.

doi:10.1080/15325008.2014.985345

Cited by 12 publications

(4 citation statements)

References 19 publications

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“…ese methods not only improve the radial EMF fluctuation characteristics and reduce the vibration, but also minimize the iron loss. Tavakoli et al [25] adopted a new power converter to reduce unbalance EMF and torque ripple of the SRM by the winding current control. Gundogmus et al [26] presented a multiobjective optimization algorithm for current distribution, which simultaneously reduce torque ripple and radial EMF fluctuation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Vibration Performance of an Improved Switched Reluctance Machine with Double Auxiliary Slots

Gao

Wang

et al. 2021

Shock and Vibration

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Considerable vibration and acoustic noise limit the further application of Switched Reluctance Machine (SRM) due to its structural characteristics and working principle. An improved SRM model with double auxiliary slots (DAS) was proposed, in which the direction of the magnetic line of force was adjusted, and the radial magnetic density in the air gap was reduced by changing the local tooth profiles of the stator and the rotor. The effects of initial rotor position and turn-on angle and turn-off angle on radial Electromagnetic Force (EMF) and maximum torque were investigated. The results indicate the radial EMF and torque increase significantly with the advancement of the turn-on angle or the delay of the turn-off angle. In the orthogonal experimental design, initial rotor position, turn-on angle, and turn-off angle were taken as the factors, and the optimal set of parameters that minimized radial EMF was determined according to a greater output torque. In contrast to conventional SRM, the radial EMF of the SRM with DAS significantly reduces when the optimal set is applied.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Vibration Performance of an Improved Switched Reluctance Machine with Double Auxiliary Slots

Gao

Wang

et al. 2021

Shock and Vibration

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“…The abrupt change of radial magnetic force at winding commutation could be significantly alleviated if the skewed stator and/or rotor laminations were used (Gan et al, 2015;Yang et al, 2013). A comprehensive flux leakages method was analyzed, which not only mitigated unbalanced magnetic forces to an acceptable range but also reduced torque ripple to a lower level (Tavakoli et al, 2015). These literatures have contributed a lot to the analysis of the radial unbalance EC 37,8 magnetic force in SRM.…”

Section: Introductionmentioning

confidence: 99%

Transverse nonlinear vibration of the eccentric rotor in a 12/8 switched reluctance motor

Wang

et al. 2020

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Purpose To investigate transverse vibration of the eccentric rotor in a 12/8 poles switched reluctance motor (SRM), a transverse analytical vibration model is built by finite element method (FEM) under the interaction of radial magnetic resultant and vibration displacement. External forces, including radial magnetic resultant and centrifugal force, are also derived in detail, according to the variation of airgap and current and other intermediate parameters with rotation angle. Design/methodology/approach The transverse vibration response of the eccentric rotor including radial magnetic resultant and vibration displacement is solved by Newmark-β method, after inputting the currents of three phase windings under angle position control strategy. The basic characteristics of radial magnetic resultant and vibration displacement are reflected in time and frequency domain. Findings The magnetic resultant vector of the eccentric rotor presents multi-petals star geometric shape. The frequency distribution of magnetic resultant relates to rotation speed, current waveform and the least common multiple of the stator and rotor teeth. However, the frequency distribution of the vibration displacement also relates closely to the first-order critical whirl speed of the rotor. When the rotor is running at certain speeds, it will display superharmonic resonance and show abundant displacement locus. Originality/value By using this analytical model and solving process proposed in this paper, the nonlinear coupled vibration response of the eccentric rotor in SRM can be analyzed and discussed rapidly; only the stator’s winding currents obtained by experiment or electromagnetic simulation is needed as input.

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“…The main origins of the acoustic noise consist of mechanical noise, torque ripple and radial vibration. The mechanical noise is primarily caused by rotor eccentricity [1–5], however, it will be greatly reduced when the motor is well machined [6]. Torque ripple results from the doubly salient structure of SRM, while it is not identified as the primary cause of acoustic noise [7].…”

Section: Introductionmentioning

confidence: 99%

Origin of resonance noise and analysis of randomising turn‐on angle method in switched reluctance motor

Guo

Zhong

Ding

et al. 2017

IET Electric Power Applications

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Radial vibration and torque ripple are the most two important factors to acoustic noise, especially when resonance is excited. This study focuses on radial vibration, which is composed of vibration impulse and fundamental vibration. The respective influence of the two components to resonance noise is analysed. It is experimentally demonstrated that fundamental vibration is more significant to resonance noise compared with vibration impulse. Accordingly, based on the already proposed randomising turn-on angle method, the reduction effect of the method is analysed in detail using different control parameters like different variation range of turn-on angle and different overlapping. The resonance noise is substantially reduced, which verifies the effectiveness of the randomising turn-on angle. In addition, it is found that the reduction effect is almost the same by different control parameters, which shows the flexibility of the method.

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Unbalanced Magnetic Force Mitigation and Torque Ripple Reduction in Eccentric Switched Reluctance Motors Using Flux Leakages

Cited by 12 publications

References 19 publications

Numerical Investigation on Vibration Performance of an Improved Switched Reluctance Machine with Double Auxiliary Slots

Numerical Investigation on Vibration Performance of an Improved Switched Reluctance Machine with Double Auxiliary Slots

Transverse nonlinear vibration of the eccentric rotor in a 12/8 switched reluctance motor

Origin of resonance noise and analysis of randomising turn‐on angle method in switched reluctance motor

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