CDA ci261 Dokumentacja

Date: 10-Sep-03 FAX COMMUNICATION No. of Pages (including this one): 1 Re: To: B-Field Exposure From Induction CookingAppliancesCleme

B-field Exposure From Induction Cooking Appliances 10In Table 1, the maximum rated power of each hob is given without and with the boosterfunction for

B-field Exposure From Induction Cooking Appliances 11Figure 3: Selected induction cookers. a) appliance 1: Electrolux GK58TCi, b) appliance 2:Gaggenau

B-field Exposure From Induction Cooking Appliances 12Figure 5: Dimensions (in mm) and coordinate system of appliance 3 (Inducs), top view and sideview.

B-field Exposure From Induction Cooking Appliances 13Figure 7: Dimensions of the wooden supports (in mm): a) appliances 1 (Electrolux) and 2(Gaggenau),

B-field Exposure From Induction Cooking Appliances 14is 12 cm without specification of pot thickness. The Electrolux manual (appliance 1) specifies abott

B-field Exposure From Induction Cooking Appliances 15Figure 10: Pans, frying-pans and pots used during the experiments to define the worst-case setof po

B-field Exposure From Induction Cooking Appliances 16Table 2: Characteristics of pans, frying-pans and pots used in the experiments.Pot Description Man

B-field Exposure From Induction Cooking Appliances 17Table 3: Measuring distances and corresponding probe-center/hob-center distances. According to EN5

B-field Exposure From Induction Cooking Appliances 18Worst-case set of pots A worst-case set of pots has been selected (see Figure 11), composedof pots

B-field Exposure From Induction Cooking Appliances 19The measurement time interval is 250 ms. The rms-value, given in [µT], is continuouslyintegrated o

B-field Exposure From Induction Cooking Appliances 21 Executive SummaryInduction cooking uses the fact that alternating magnetic fields generate heat in

B-field Exposure From Induction Cooking Appliances 204 Evaluation of Measurement System4.1 Sensor CharacterizationHelmholtz coil The uncertainty of the

B-field Exposure From Induction Cooking Appliances 21B = (45)3/2µ0NIR(5)The generated B-fields in the Helmholtz coil are 8.6 µT and 0.86 µT when applyin

B-field Exposure From Induction Cooking Appliances 22from those two measurements. As given in the specifications, the cut-off frequencies for theNarda pr

B-field Exposure From Induction Cooking Appliances 23Spherical isotropy The experimental setup shown in Figure 15 f) was used to evaluate thespherical

B-field Exposure From Induction Cooking Appliances 244.2 Time- and Frequency-Domain Characterization of the Induction Cookers4.2.1 Time-Domain Characte

B-field Exposure From Induction Cooking Appliances 25Figure 18: Time-domain signals of the alternating magnetic field generated by ap-pliance 2. Graphs

B-field Exposure From Induction Cooking Appliances 26Figure 19: Time-domain signals of the alternating magnetic field generated by appli-ance 3. Graphs

B-field Exposure From Induction Cooking Appliances 27Table 5: Signal and envelope modulation frequency of appliances 1, 2 and 3 for the heat settings4

B-field Exposure From Induction Cooking Appliances 28Figure 20: Dependency of the signal frequency on the heat setting. Graphs a), b) and c)correspond

B-field Exposure From Induction Cooking Appliances 29Table 7: Appliance 1, Calculated harmonics contribution in [%], in terms of power.Heat setting 4 5

B-field Exposure From Induction Cooking Appliances 3Figure 1: a) Comparison between the compliance value (B-field measured according to EN50366)and the

B-field Exposure From Induction Cooking Appliances 30Figure 21: Harmonics contribution, in [dB] (power spectrum, 10 dB per division). Graphs a) andb),

B-field Exposure From Induction Cooking Appliances 314.3 Uncertainty BudgetTable 10 gives a list of probable sources of error and an evaluation of the

B-field Exposure From Induction Cooking Appliances 32Table 10: Measurement uncertainty evaluation. As described in IEEE 1528-2003, the tolerance,the pr

B-field Exposure From Induction Cooking Appliances 335 Assessments According to EN50366 conditionsOne objective of this study was to measure whether th

B-field Exposure From Induction Cooking Appliances 34diameters of standard cooking vessels are: 110 mm, 145 mm, 180 mm, 210 mm and 300 mm. Thehobs are

B-field Exposure From Induction Cooking Appliances 35Figure 24: Appliance 1, single-hob measurement using the standard set of pots (frontand rear sides

B-field Exposure From Induction Cooking Appliances 36Figure 25: Appliance 1, single-hob measurement using the standard set of pots (leftand right sides

B-field Exposure From Induction Cooking Appliances 37Figure 26: Appliance 2, single-hob measurement using the standard set of pots (frontand rear sides

B-field Exposure From Induction Cooking Appliances 38Figure 27: Appliance 2, single-hob measurement using the standard set of pots (leftand right sides

B-field Exposure From Induction Cooking Appliances 39Figure 28: Appliance 3, with pot 3 (large pot, standard set of pots). The B-field ismeasured along

B-field Exposure From Induction Cooking Appliances 4Contents1 Executive Summary 22 Introduction 62.1 Background . . . . . . . . . . . . . . . . . . . .

B-field Exposure From Induction Cooking Appliances 416 Worst-Case Exposure Conditions for Varied Loading of theInduction CookersThe influence of several

B-field Exposure From Induction Cooking Appliances 42Figure 31: Influence of pot characteristics (bottom diameter, shape, bottom flatnessand material gra

B-field Exposure From Induction Cooking Appliances 43Figure 32: Influence of the volume of water and the duration of measurements onthe B-field measured,

B-field Exposure From Induction Cooking Appliances 44a factor of 4 when using a lid, allowing longer measurement times, while maintaining constantmeasu

B-field Exposure From Induction Cooking Appliances 45Table 12: Standard scenarios (using the standard set of pots) defined to measure the B-fieldemitted

B-field Exposure From Induction Cooking Appliances 46hob use, and pan centered and not. The worst-case exposure depends on the combinations ofpot/hob/a

B-field Exposure From Induction Cooking Appliances 47Multi-hob measurement using the standard set of pots Figure 36 shows the B-fieldmeasured in the vic

B-field Exposure From Induction Cooking Appliances 48Figure 35: Appliance 1 single-hob measurement using the standard set of pots: InGraphs a) to d), t

B-field Exposure From Induction Cooking Appliances 49Figure 36: Appliance 1 multi-hob measurement (four hobs) using the standard set ofpots. Comparison

B-field Exposure From Induction Cooking Appliances 59 Acknowledgments 73

B-field Exposure From Induction Cooking Appliances 50Figure 37: Appliance 1 multi-hob measurement (two hobs) using the standard setof pots (front side

B-field Exposure From Induction Cooking Appliances 51Figure 38: Appliance 1 single-hob measurement using the worst-case set of pots(front side of the a

B-field Exposure From Induction Cooking Appliances 52Figure 39: Appliance 1 multi-hob measurement (three hobs) using the worst-case setof pots (front s

B-field Exposure From Induction Cooking Appliances 53Figure 40: Appliance 1 multi-hob measurement (two hobs) using the worst-case setof pots (front sid

B-field Exposure From Induction Cooking Appliances 546.1.3 Appliance 2Single-hob measurement using the standard set of pots Figure 41 shows the B-fieldm

B-field Exposure From Induction Cooking Appliances 55Figure 42: Appliance 2, multi-hob measurement using the standard set of pots, withpots centered: T

B-field Exposure From Induction Cooking Appliances 56Figure 43: Appliance 2, multi-hob measurement using the standard set of pots withpots non-centered

B-field Exposure From Induction Cooking Appliances 57Figure 44: Appliance 2, single-hob measurement using the worst-case set of pots.Comparison of the

B-field Exposure From Induction Cooking Appliances 58Figure 45: Appliance 2, multi-hob measurement using the worst-case set of pots.Comparison of the B

B-field Exposure From Induction Cooking Appliances 596.1.4 Appliance 3Single-hob measurement using pot 3, large pot, standard set of pots Figures 46 an

B-field Exposure From Induction Cooking Appliances 62 Introduction2.1 BackgroundInduction cooking has gained popularity since its introduction in the 1

B-field Exposure From Induction Cooking Appliances 60Figure 46: Appliance 3 and pot 3 (large pot, standard set of pots), front side ofthe appliance. Co

B-field Exposure From Induction Cooking Appliances 61Figure 47: Appliance 3 and pot 3 (large pot, standard set of pots). Graphs a) to f),g) to l) and m

B-field Exposure From Induction Cooking Appliances 62Figure 48: Appliance 3 and pot 13 (small pot, standard set of pots), front side ofthe appliance. C

B-field Exposure From Induction Cooking Appliances 63Figure 49: Appliance 3 and pot 13 (small pot, standard set of pots). Graphs a) to f ),g) to l) and

B-field Exposure From Induction Cooking Appliances 64Figure 50: Appliance 3 and pot 8 (worst-case set of pots), front side of the appliance.Comparison

B-field Exposure From Induction Cooking Appliances 65Figure 51: Appliance 3 and pot 8 (worst-case set of pots). Graphs a) to f ), g) to l) andm) to r)

B-field Exposure From Induction Cooking Appliances 666.1.5 B-field Measurement Above the AppliancesAs indicated in Figure 52, the B-field was measured ab

B-field Exposure From Induction Cooking Appliances 67Figure 53: B-field measurement above the appliances: a) and b) correspond to appliance1, with a) po

B-field Exposure From Induction Cooking Appliances 686.1.6 DiscussionThe evaluation according to EN50366 (i.e., for a measuring distance of 30 cm) demo

B-field Exposure From Induction Cooking Appliances 69Table 14: Summary of the results discussed in Chapters 6.1.2, 6.1.3 and 6.1.4. The column ”other s

B-field Exposure From Induction Cooking Appliances 73 Experimental Setup3.1 Setup DesignIn order to find and evaluate the worst-case B-field exposure tha

B-field Exposure From Induction Cooking Appliances 707 Approximation of Induced Current DensityAs shown in Chapters 6.1.2, 6.1.3, 6.1.4 and in Table 14

B-field Exposure From Induction Cooking Appliances 71| E(t) | = πafB0(14)The induced current density J is derived from Ohm’s law:| J(t) |= πafσB0(15)Th

B-field Exposure From Induction Cooking Appliances 728 ConclusionThe objective of this study was to assess the maximum exposure that arises during the

B-field Exposure From Induction Cooking Appliances 73Fifteen pots and pans of different sizes and shapes, as well as of various materials wereevaluated

B-field Exposure From Induction Cooking Appliances 74[5] ”Household and similar electrical appliances Electromagnetic fields - Methods for evalua-tion a

B-field Exposure From Induction Cooking Appliances 8Figure 2: Experimental setup to assess the B-field exposure. The Narda probe ELT-400 isattached on t

B-field Exposure From Induction Cooking Appliances 9Table 1: Selection of induction cooking equipments available on the Swiss market (as of 1. Dec. 200