IEEE Transactions on Industry Applications · 2012 · 49 citations · 24 references
EngineeringElectrical EngineeringMechanical EngineeringElectric MachinesHeat TransferMachine DesignEngine SystemsInsulation SystemsMachine WindingsPermanent Magnet MachinesElectromagnetic DesignEngine Thermal ModelingHeat Transfer In Electrical MachinesInsulation StrategiesThermal Management Of Electric MachinesThrust FluctuationThrust RippleVoltage Control
A 1‑kW axially magnetized permanent‑magnet linear alternator and its control strategy are investigated for free‑piston Stirling engines. The study compares power densities of axially and radially magnetized structures and examines stator end‑tooth shape to reduce thrust fluctuation for FPSE applications. Thermal field and slot‑coil heating are modeled with an equivalent method, stroke control and energy‑storage‑based transient power supply are investigated, and the hardware structure and voltage control scheme are validated in Matlab/Simulink. Prototype alternator and controller design and testing yielded satisfactory experimental results.
A 1-kW axially magnetized permanent-magnet linear alternator and the control strategy are investigated for free-piston Stirling engines (FPSEs). To meet the requirement of FPSE applications, the power densities of axially magnetized and radially magnetized structures are compared, and the shape of the stator end tooth is studied to reduce thrust fluctuation. Moreover, the thermal field of the proposed alternator is investigated for the appropriate selection of insulation class. The equivalent method is used to simplify the thermal modeling of slot coils. Due to the complex control of the FPSE, the stroke control strategy is investigated. Energy storage devices are employed to provide transient power supply and reduce voltage ripple. The hardware structure and voltage control scheme are discussed and validated by Matlab/Simulink. The prototype alternator and controller were designed and tested, and satisfactory experimental results were obtained.
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