A Novel Dual Rotor Permanent Magnet Flux Switching Generator for Counter Rotating Wind Turbine Applications

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 at a good voltage regulation factor of 18.67%. In additional, despite of 2.27% improvement of efficiency in case of turns analysis and 4.81% increase in overload and overspeed capability, contour efficiency map unveils that CR-DRPMFSG offer wide range of higher efficiency operating region during over-load and over-speed conditions accompany with stable voltage with the varying load profile. INDEX TERMSFlux switching machines, Ferrite permanent magnet, counter rotation, wind turbines, Wind power generator, Wind power application I.

Generating characteristics and experimentation of counter rotating dual rotor wound field flux switching wind generator

“…Based on the loss variation, efficiency of the developed model is investigated using analytical formulation reported in ref. [14]. From Figure 8, it is evident that under higher field MMF, both the output power and efficiency are greatly improved in comparison with the lower field MMF.…”

Synergetic-PI controller based on genetic algorithm for DPC-PWM strategy of a multi-rotor wind power system

“…Equation (1) represents both the torque and the mechanical power generated by the turbine used in this work [37]. In addition, the mechanical energy generated by the MRWT system is greater than the mechanical energy generated by the single-rotor wind turbine by about 23¨%, which is a very significant ratio and indicates the efficiency of the MRWT system [9].…”

“…The mechanical energies generated by the first and second turbines can be expressed by equation ( 2) [37,9]. The mechanical energy generated by the MRWT system is related to wind speed(w1 and w2), the coefficient of power (Cp), air density (ρ), area(S1 and S2).…”

“…In the field of WE, several types of turbines can be used to generate enough energy from the wind to spin a generator. These types can be divided into two types: single-rotor WEs [6][7][8] and multi-rotor WEs [9,10]. Whereas the multi-rotor WE is a development of the single-rotor WE in order to increase the value of torque and mechanical energy required to rotate the generator [11].…”

An analytical formula for back EMF waveform of a counter‐rotating dual‐rotor non‐slotted axial flux permanent magnet synchronous machine

“…Counter-rotating dual-rotor axial flux permanent magnet (CRDRAFPM) motors are one of the types of synchronous motors that have higher power density and reliability in comparison with the single-sided structure [3]. CRDRAFPM machines can be used as generators in wind turbine applications [4][5][6] or as motors in elevators, underwater vehicles, and propulsion ships [7,8]. In CRDRAFPM, to produce two fields with different directions, a special arrangement of windings is used.…”