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Study of innovative electric machines for high efficiency vehicular traction applications
Get PDFThis thesis collects some of the work accomplished during the PhD research activity focused on the study of special electric machines for vehicle traction applications. The work is divided into due parts. The rst part is mainly technological and covers some studies and experimental activities concerning new technical solutions to solve some common issues in operation of electric motors for automotive use, namely ux weakening and cogging torque. The second part has a more theoretical nature and focuses on some methods for electric machine modeling and analysis which has been developed to facilitate the study and design optimizations carried out during the PhD research work.
The chapters in the rst part address the following topics:
1. Development and testing of an interior-permanent-magnet motor prototype fully conceived, designed and manufactured at the University of Trieste to implement a new concept of flux weakening system at high speeds. The concept has been also protected through a pending patent.
2. Multi-objective design optimization of an interior permanent magnet reluctance-assisted synchronous motor for the automotive industry.
The design optimization was meant to support an industrial development project which is still in progress so no prototype has been built yet.
3. Study of a new optimized magnetic wedge design capable of reducing cogging torque in automotive propulsion motors having open stator slots.
The second part proposes some analytical and numerical results that have been worked out to approach the modeling and optimization of various kinds of permanent magnet synchronous motors. The main problem to which these chapters try to answer is to nd suciently fast but accurate methods for permanent magnet analysis without time-consuming finite-element transient analysis. The proposed methods have been successfully integrated into design optimization programs used in the industrial environment in the development of innovative electric machines not only for the automotive industry
Analytical calculation of air-gap armature reaction field including slotting effects in fractional-slot concentrated-coil SPM multiphase machines
No full textOn the computation of rotor losses through a set of harmonic finite-element analysis in fractional-slot concentrated-coil permanent-magnet machines
No full textA system-level approach to the optimal dimensioning of induction-motor variable-frequency drives
No full textA simple approach to air-gap armature reaction field computation in fractional-slot SPM multiphase machines for different air-gap topologies
No full textA stator winding design with unequally-sized coils for adjusting space harmonic content of induction machines
No full textModeling, Analysis and Testing of a Novel Spoke-Type Interior Permanent Magnet Motor with Improved Flux Weakening Capability
Get PDFSpoke-type interior permanent magnet (IPM) machines are an attractive topology for high performance electric motors, especially designed for vehicle traction applications. In this paper, a special design for a spoke-type IPM motor is presented to enhance motor flux-weakening capability in the operation over a wide speed range. The proposed design consists of a simple and robust mechanical device that includes radially-displaceable rotor yokes, connected to the shaft by means of springs. At high speed, the centrifugal force prevails over the elastic one due to springs, causing the mobile yokes to displace radially and to establish a partial magnetic short circuit between permanent magnets. This increases permanent magnet leakage flux and consequently reduces the air-gap field. As a result, a mechanical flux weakening effect is achieved at high speed, which helps significantly reduce the demagnetizing d-axis current to be injected by the inverter, along with the related copper losses and demagnetization issues. The proposed design is investigated in the paper using an analytical model whose parameters are computed by finite-element analysis (FEA). The effectiveness of the solution being set forth is successfully proven by some testing on a laboratory prototype. Experimental results are compared to analytical predictions showing a satisfactory accordance
Experimental evaluation of damper circuit influence on the performance of multiphase synchronous generators feeding multiple rectifiers
No full textA Stator Coil Design with Unequally-Sized Coils for Adjusting Air-Gap Space Harmonic Content of Induction Machines
No full textA Numerica Design Platform for Induction Motor Efficiency Enhancement Under Cost and Performance Optimization Constrains
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