Page - 336 - in Emerging Technologies for Electric and Hybrid Vehicles

Energies 2017,10, 315 Table3.Material characteristicsof ferriteblocks typesAandBidentifiedinFigure16. Parameter FerriteBlockTypeA FerriteBlockTypeB Dimensions (W×L×H) 10.0cm×10.0cm×1.0cm 10.0cm×4.0cm×1.0cm Material Manganese-Zinc (Mn-Zn) Permeability (μ) 3200 Saturationfluxdensity (BS) 520mT The laboratory scalevehicle is shown inFigure17. The lateralpositiondetectionunit aswell as the fuzzysteeringcontrollerunitdescribedin[24]wereprogrammedinto themicrocontrolleras shown inFigure 17a, and the constructed loadcoil/sensor coil unitwasmountedunderneath the vehicle as shown inFigure 17b. The complete experimental setup is shown inFigure 18,where a 20kHzinverterwasusedas themainsource fordeliveringpowerwirelessly fromthesourcecoil to the loadcoil. It canalsobeobservedthatanacrylicplatehasbeenplacedbetweenthesourcecoiland loadcoil. Thementionedacrylicplatewasmovedlaterally left andright togeneratemisalignment betweenthesourcecoilandloadcoil. (a) (b) Figure 17. Experimental vehicle. (a) Topview, showing themicrocontroller unit; (b) Bottomview, showingthe loadcoil/sensorcoilunit. Figure18.Experimental setupof theexperimentalvehiclewith theACASunit. Figure19showstheschematicof theoverall experiment,andthevaluesofparametersshownare listed inTable4. TheVS is themainvoltagesourcegenerated fromthe20kHz inverterunit, and it wasadjustedtogenerate90Wand10Wat the loadfor thefirstexperimentandsecondexperiment, respectively. During the constructionphaseof theexperimentalvehicle, itwasobserved that a lot ofnoisewasgeneratedwhichaffectedthesensorcoil’smeasurementaccuracy. Therefore,anactive non-inverting (NI) low-pass filter (LPF)was constructedusing an instrumentation amplifier, and placedbetweenthesensorcoil andthevoltagecomparatoras showninFigure19. TheR,Cvalues for theLPF,assignedasRLPF, andCLPF, respectively,wasassignedtomatchthecut-off frequencyof 20kHzascloseaspossible,which isalso listed inTable4. 336