Abstract
In this paper counter rotating (CR) dual rotor permanent magnet flux switching generator (CR-DRPMFSG) is designed and relatively studied with co- rotating DRPMFSG (CoR-DRPMFSG) for wind turbine applications. The developed CR- DRPMFSG and CoR-DRPMFSG share same stator linked with flux bridge which provide flux route. A comprehensive relative assessment of both CR- DRPMFSG and CoR-DRPMFSG are presented with static attributes, over-load, and over-speed capability for generating output voltage, output current, output power, power density, losses, and efficiency. Comparative study with static characteristics illustrates that developed CR- DRPMFSG shows 34.34% elevated phase flux which improve output power, cumulative output torque is improved by 23.86%, and suppressed cogging torque by 66.87% at CoR-DRPMFSG that results lower pulsation in instantaneous torque. Furthermore, a detailed performance analysis is investigated with different number of armature winding turns per phase and combined over-load and over-speed capability. Study discloses that in contrast with CoR-DRPMFSG, counterpart CR- DRPMFSG offer 27.17% higher output power that results 1.25 times power density with a good voltage regulation factor of 18.67%. In additional, despite of 2.27% improvement of efficiency in case of phase winding turns analysis and 4.81% increase in over-load and over-speed capability, contour efficiency map unveils that CR- DRPMFSG offer wide range of higher efficiency operating region during over-load and over-speed condition accompany with stable voltage profile with load variation.
Highlights
The prospective growth in necessity and protection of the natural environment dictating the global warming compels to rise the expansion of renewable energy i.e., fuel cell, geothermal, solar energy, biomass plant, tidal energy, and wind turbines for wind energy
Based on position of permanent magnet, generators for wind power applications are categorized as rotor permanent magnet generator i.e., surface mounted permanent magnet (SPM) generator and stator permanent magnet generator
In comparison with the single rotor, DRDDCoRWT results more power density due to rotation of dual rotors that reside in front and rare sides of wind turbines. In this configuration permanent magnet flux switching generator (PMFSG) is utilized with dual rotor direct drives wind turbines (DDWT) configuration such that front turbine is attached with one set of rotors whereas the rare side wind turbine is attached to the second rotor set
Summary
The prospective growth in necessity and protection of the natural environment dictating the global warming compels to rise the expansion of renewable energy i.e., fuel cell, geothermal, solar energy, biomass plant, tidal energy, and wind turbines for wind energy. In comparison with the single rotor, DRDDCoRWT results more power density due to rotation of dual rotors that reside in front and rare sides of wind turbines In this configuration PMFSG is utilized with dual rotor DDWT configuration such that front turbine is attached with one set of rotors whereas the rare side wind turbine is attached to the second rotor set. Comparison of DDDRCRWT power density with single rotor wind turbine reveals that DDDRCRWT produces maximum power density because of dual rotors (front and rare side) that sandwich stator and rotates in counter direction. The resultant power is generated due to front and rare side wind turbines resulting double power generated In this configuration PMFSG is utilizes with dual rotor or dual stator DDWT configuration. Utilizing generator speed (n) and Nr, phase back-EMF frequency under no-load operation can be computed as [36]
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