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Design of a line start permanent magnet synchronous motor

Fraser, Andrew (2008) Design of a line start permanent magnet synchronous motor. Internship Report, Murdoch University.



Electric motor manufacturers are under increasing pressure through public demand to produce more efficient machine designs. The growing cost of fossil fuels and an increased awareness of the need to reduce greenhouse gas emissions have forced many manufacturers to develop new and innovative motors which offer high reliability and vastly greater operating efficiencies. This thesis investigates the design of a prototype permanent magnet synchronous motor (PMSM) suitable for use in submersible pumping applications. A PMSM offers excellent potential to increase motor efficiency as, unlike conventional induction and synchronous motors, the rotor is (theoretically) not subjected to any copper losses. The Infolytica Corporation's 'Magnet' finite element analysis software was used to design, simulate and evaluate a line start six inch PMSM and a six inch conventional induction motor. Prior to designing the new motors, the software's accuracy and suitability was assessed by simulating a pre-existing induction motor. It was found that Magnet accurately modelled a real world motor with only minor, quantifiable, errors. Most notably, the software's lack of ability to fully model three dimensional objects and account for machine iron and other stray losses led to an almost constant overestimation of machine efficiency. A prototype six inch 1kW standard induction motor and a 1kW PMSM were designed and simulated. Magnet simulation results indicated that the PMSM was 14% more efficient than the induction motor at full load and was capable of line starting from all initial rotor positions. Plans for both motors were compiled and construction of both is expected to begin in the near future. Physical testing of both machines and further development of the PMSM motor for commercial applications is discussed.

Item Type: Internship Report (Bachelor of Engineering)
Murdoch Affiliation(s): School of Engineering and Energy
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