Abstract
In this paper two permanent magnet flux switching generator (PMFSG) are designed for 2 kW output power and 220 V phase voltage at 1500 rpm and comparatively analyzed for wind power application. Both PMFSG share same C-core stator connected back-to-back through flux bridge (β) with different rotor position i.e., inner rotor PMFSG (IR-PMFSG) and outer rotor PMFSG (OR-PMFSG). A detailed comparative analysis with various β for both IR-PMFSG and OR-PMFSG are performed under static characteristics, rated condition, overload capability and over-speed capability for generating output voltage, current, power and efficiency. Comparison of the static characteristics reveal that IR-PMFSG offers 47.93% higher rated power, 2.83% higher efficiency, 22.78% more magnetic flux, 56.91% reduced cogging torque and 83.18% lower torque ripples at the cost of 62.69% higher voltage regulation factor. Furthermore, under rated operating condition and overload capability with same specifications it is found that IR-PMFSG exhibits 1.47 times power than that of OR-PMFSG counterpart. Finally, over-speed capability is investigated in term of the output power which shows that IR-PMFSG significantly generate almost 2.25 time of the specification power whereas OR-PMFSG exhibits nearly 1.25 times power. This analysis shows that IR-PMFSG can be operated at wide-speed rage for higher power specification requirements maintaining efficiency greater than 90%.
Highlights
The potential increase in demand and protection of the environment dominating the net global warming led to increase in development of renewable energy i.e., solar energy, fuel cell, tidal energy, and wind energy
From Figure. 13 it can be clearly seen that torque profile of both inner rotor (IR)-permanent magnet flux switching generator (PMFSG) and outer rotor (OR)-PMFSG with different βin and βout saturates at higher speed whereas it declines slightly after 1600 rpm despite of increase in rotor speed due to increase in the load angle and decrease in q-axis current
Static analysis concludes that IR-PMFSG offers 47.93% higher rated power, 2.83% higher efficiency, 22.78% more magnetic flux, 56.91% reduced cogging torque and 83.18% lower torque ripples at the cost of 62.69% higher voltage regulation factor
Summary
The potential increase in demand and protection of the environment dominating the net global warming led to increase in development of renewable energy i.e., solar energy, fuel cell, tidal energy, and wind energy. Wind power generators adopted numerous types of AC generators such as induction generator, asynchronous generator, permanent magnet (PM) synchronous generator, electrically excited synchronous generator, and PM flux switching generator (PMFSG). Flux nature and stator PM magnetization, numerous PMFSM are investigated with different rotor position i.e., inner rotor [15-16], outer rotor [17-18], and dual rotor configuration [19-20] with various stator configuration to achieve maximum power density. Wasiq Ullah: Investigation of Inner/Outer Rotor Permanent Magnet Flux Switching Generator for Wind Power Application performance for wind power generation is still not reported. To achieve an optimum flux bridge to join upper and lower slot portion and provide path to the working harmonics content, a detailed investigation is performed on its dimension for better performance. Cross sectional view and winding layout (a) stator and (b) Coil and phase EMF phasor
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