A Simple Analytical Model of Static Eccentricity for PM Brushless Motors and Validation through FEM Analysis

Andrea Del Pizzo, Luigi Pio Di Noia and Emanuele Fedele
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Andrea Del Pizzo: Deptartment of Electrical Engineering and Information Technology, University of Naples Federico II, 80125 Napoli, Italy
Luigi Pio Di Noia: Deptartment of Electrical Engineering and Information Technology, University of Naples Federico II, 80125 Napoli, Italy
Emanuele Fedele: Deptartment of Electrical Engineering and Information Technology, University of Naples Federico II, 80125 Napoli, Italy

Energies, 2020, vol. 13, issue 13, 1-19

Abstract: The paper firstly summarizes a simple analytical model of the air gap flux-density distribution for isotropic permanent magnet (PM) synchronous machines, in the presence of static eccentricity. The model was proposed by the authors in a previous paper and is based on an efficacious analytical expression of the variable length of air gap magnetic field lines which occur in eccentric brushless machines with surface-mounted permanent magnets. The approximate expression of the air gap field makes it possible to achieve a mathematical model with concentrated parameters close to that of a PM machine without eccentricity. The expression of the armature voltages and electromagnetic torque are found, also with reference to steady-state operating conditions at fixed rotor speed and impressed currents. The differences introduced by the considered type of eccentricity are evaluated and highlighted especially with reference to the air gap inductance and to waveforms and frequency spectra of voltages and shaft torque. Numerical results in a case-study of an 8-pole, 110 kW PM motor are compared to those obtained by using finite element analysis.

Keywords: static eccentricity; isotropic PM brushless machines; air gap flux-density (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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