Eccentricity in Synchronous Reluctance Motors—Part I: Analytical and Finite-Element Models

Mahmoud, Hanafy; Bianchi, Nicola

doi:10.1109/tec.2014.2384535

Cited by 58 publications

(26 citation statements)

References 10 publications

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“…A wide investigation of the theoretical models of both REL and PMAREL machines is presented in [11], [12], [23], and [13]. Those models are general and valid for different stator winding arrangements, number of poles, and number of slots.…”

Section: Theoretical Analyses Literature Reviewmentioning

confidence: 99%

“…However, the literature is showing that the magnetic performance of the eccentric reluctance (REL) and permanent magnet assisted reluctance (PMAREL) synchronous machines are only marginally investigated in [11]- [13]. Although there are several comparisons between the performance of REL, PMAREL, and SPM synchronous machines, with cylindrical rotor [14], [15] comparison among these machines at different eccentricity cases is missing.…”

Section: Introductionmentioning

confidence: 99%

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Eccentric Reluctance and Permanent Magnet Synchronous Machines Comparison

Mahmoud

Al-Ani

Gerada

2018

IEEE Trans. on Ind. Applicat.

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Abstract-This paper deals with a comparative study between reluctance (REL), permanent magnet assisted reluctance (PMAREL), and surface mounted permanent magnet synchronous machines with rotor eccentricity. Static, dynamic, and combined eccentricity cases are considered. For the sake of generality, this comparison is carried out at different levels of airgap flux density, as different current angles, different permanent magnet (PM) materials, and different number of magnetic poles. Additionally, different stator windings arrangements, i.e, distributed and fractional slot concentrated windings are taken into account. Besides, different rotor geometries of REL and PMAREL machines are included. As a case of study, 36-slot machine is analyzed, considering three flux barriers per pole, however, the study can be applied to any machine geometry.Due to the structural criticality of the rotor iron ribs of the REL machines, the impact of the eccentricity on the mechanical stress acting on those ribs and the deformation of the rotor is studied.

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Section: Theoretical Analyses Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Eccentric Reluctance and Permanent Magnet Synchronous Machines Comparison

Mahmoud

Al-Ani

Gerada

2018

IEEE Trans. on Ind. Applicat.

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“…These factors are promoting SynRMs and ferrite-PM assisted SynRMs (fPMa-SynRMs) to be competitors of induction machines [2] and PM synchronous machines [3] in many applications requiring a high efficiency and torque density, wide constant-power speed range or overload capability [4]. Ferrite-assisted SynRMs rely on abundant and low-cost ferrite PMs, offering a good option since they generate both magnetic and reluctance torques [5].…”

Section: Introductionmentioning

confidence: 99%

Detection of Eccentricity Faults in Five-Phase Ferrite-PM Assisted Synchronous Reluctance Machines

et al. 2017

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Air gap eccentricity faults in five-phase ferrite-assisted synchronous reluctance motors (fPMa-SynRMs) tend to distort the magnetic flux in the air gap, which in turn affects the spectral content of both the stator currents and the ZSVC (zero-sequence voltage component). However, there is a lack of research dealing with the topic of fault diagnosis in multi-phase PMa-SynRMs, and in particular, those focused on detecting eccentricity faults. An analysis of the spectral components of the line currents and the ZSVC allows the development of fault diagnosis algorithms to detect eccentricity faults. The effect of the operating conditions is also analyzed, since this paper shows that it has a non-negligible impact on the effectivity and sensitivity of the diagnosis based on an analysis of the stator currents and the ZSVC. To this end, different operating conditions are analyzed. The paper also evaluates the influence of the operating conditions on the harmonic content of the line currents and the ZSVC, and determines the most suitable operating conditions to enhance the sensitivity of the analyzed methods. Finally, fault indicators employed to detect eccentricity faults, which are based on the spectral content of the stator currents and the ZSVC, are derived and their performance is assessed. The approach presented in this work may be useful for developing fault diagnosis strategies based on the acquisition and subsequent analysis and interpretation of the spectral content of the line currents and the ZSVC.

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“…Several papers dealing with flux density prediction in PMSM can be found in the literature [4], [5]. In [6], [7] and [8], [9] an approximated method is introduced to calculate the flux density for rotor eccentricity and the resultant unbalanced radial force for synchronous reluctance and PMS motors, respectively. Furthermore, [10] presents a very detailed method to analytically calculate UMP exploiting the Maxwell stress tensor method.…”

Section: Introductionmentioning

confidence: 99%