JFE(和文)No.4-12_下版Gのコピー

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1 JFE No p Electrical Steels for Advanced Automobiles Core Materials for Motors, Generators, and High-frequency Reactors SENDA Kunihiro JFE NAMIKAWA JFEMisao HAYAKAWA JFEYasuyuki JNE JNEH JGE 6.5 Si 4 Hz 1 khz JFE JNEX Si 5 khz 1 khz JFE JNHF Abstract: Performance of core steels has been investigated using several developed techniques such as model motor measurement, local measurement in a motor core and model transformer measurement in order to develop electrical steels suited to the electrification in automobiles. From the results obtained in the model motors, non-oriented electrical steel JNE with high flux density and low iron loss, and JNEH with low iron loss at high frequencies were newly developed for automotive motor application. For segment type motor cores, grain-oriented electrical steel JGE with low iron loss in the directions of the rolling direction has been developed. For high frequency reactor usage, JFE Super Core JNEX having 6.5%Si content has demonstrated low noise and low core loss at high frequencies such as from 4 Hz to 1 khz. JFE Super Core JNHF has demonstrated low core loss at very high frequencies such as from 5 khz to 1 khz. 1. CO2 EV JFE HEV FCV 58

2 5JN23 Brushless DC motor 35JNA Power output (W) 1,2) Fig. 2 Dependence of motor efficiency on power output DCBLDCTable 1 Magnetic properties of stator core materials used W 15/5 B 5 (T) BLDC 48 V 3 W V 4 W JNA3 5JN23 5JN JN Test made on 25 cm Epstein sample(l C) after stress relief annealing at 75 C for 2 h in N 2 BLDC 2 1 rpm BLDC BLDC 1 5 rpm 2 4 rpm B5 2 3 rpm BLDC Fig. 2 BLDC 1 Hz12 Hz Fig. 1 BLDC BLDC W15/5 4 Hz W1/4 1) BLDC BLDC 1) W15/5 B5 B5 B5 2) Table 1 B5 4 Maximum efficiency (%) Brushless DC motor Maximum efficiency (%) Sheet iron loss W 1/4 Sheet iron loss W 15/ B T 1.68 T 5JN series Induction motor 5JNE series 1.71 T 1.75 T Fig. 1 Dependence of maximum efficiency on sheet iron loss Motor efficiency (%) JN4 35JNA25 5JNA3 5JN BLDC Fig. 3 59

Needle probes H θ BLDC 35JNE3 1 V 6 Hz 2 24 5JN4 Fig.

3 Schematic view of local magnetic measurement in a stator core H r B θ Fig.

4 (A/m) 1 8 6 Rotation direction B rm H rm B θm H θm (T) 1.6 1.4 1.2 1..8.6.4.2 (A/m) 4 Fig.

3 Needle probes H θ BLDC 35JNE3 1 V 6 Hz JN4 Fig. 4 BLDC 3) B r Hall elements Brm, Bθm, Hrm, Hθm Stator Rotor Fig. 3 Schematic view of local magnetic measurement in a stator core H r B θ Fig. 5, 6 4,5) BLDC B rm H rm B θm H θm (T) (A/m) Rotation direction B rm H rm B θm H θm (T) (A/m) 4 Fig. 5 Distribution of local magnetic propery in stator core of induction motor Iron loss, W Fig. 4 Distribution of local magnetic property in stator core of brushless DC motor Fig. 6 Distribution of local iron loss in stator core of induction motor JFE No

4 3. 5JNA6W15/5 6. W/kg 35JNA3W15/ JNEH1 2 W1/4 12. W/kg B5 JIS B5 JNE JNP JNA JNEH Fig. 7 W15/5 W1/4 B5 1JNE 6,7) 35JNE23 W15/5 2.3 W/kgB T HV 2 GO 2JNP JFE B5 5JNP1 B T W15/5 8. W/kg 3JNA B 5 (T) B 5 (T) 3. W/kg 4JNEH 3.2 BLDC GO JGE 8) Fig. 8 JGE GO CGO B5 JGE CGO CGO 1.8 5JNP series JNP1 JNA series (annealed) JNP JNA3 JNP2 5JNA JNA JNE 7 series 25 5JN series JN W 15/ High Si content : Developed 35JNE3 : Conventional 35RMHE25 3JNE 2JNEH12 25JNE 2JNEH15 2JNEH series 35JN2 1 35JNE23 35JNE series 35JN36 35JN3 35JN27 35JN23 35JN21 Low Si 35JN series 35JN44 5JN series 5JN35 5JN27 5JN W 1/4 Fig. 7 Maps of electrical steel products of JFE steel JGE Iron loss, W 1/ RD CGO JGE Angle from rolling direction ( ) Fig. 8 Dependence of iron loss on angle from rolling direction Burr height (µm) CGO JGE TD Number of strokes ( 1 4 ) Fig. 9 Change in burr height with number of punching 61 JFE No

5 Motor efficiency (%) Fig. 9 CGO CGO JGE Si Fig. 1 JGE BLDC JGE JGE JFEJNEXJNHF W / 1/4 W 5/2K W 2/5K W 1/1K W.1/1K Fig. 12 Iron losses of JNEX and JNHF 6.5 Si JFE JNEX JNEX SRM 1JNEX rpm 1 35JN21 Si Si 6.5 2JNHF JNHF 6.5Si Fig. 11 Fig khz JNEX 9) Hz 1 khz PWMpulse width modulation 1) JGE Torque (Nm) Fig. 1 Dependence of motor efficiency on torque Noise (db) Noise (db) Iron loss 1 khz Grain oriented Si steel (3%Si) B (T) f (Hz) 5 11) Grain oriented Si steel (3%Si) 6.5% Si steel Flux density (T) 6.5% Si steel Frequency (Hz) Fig. 11 Noise of model transformer JNEX JNHF 12) Si Si Si JNEX JFE No

Flux density, B (T) 2. 1.5 1..5 1 27JGS (Developed) 1 JFE RM-98-1471998p.

25 6 Honda R&D Technical Reviewvol. 14no. 2 22p. 25 7 RM-2-147 5.

1 1 1 1 1 1 1 1 Magnetizing force, H (A/m) Magnetizing force, H (A/m) Fig.

1183. JFE 11 14 5-11622p. 157 12 11 7 1999S. 23. 12 BLDC 13 vol. 29no. 3 1997p.

6 Flux density, B (T) JGS (Developed) 1 JFE RM p. 1 JGS P1 JGS JGH Fig. 13 JGS JGH B8.4 T RM p JGS MAG-2-22p Honda R&D Technical Reviewvol. 14no. 2 22p RM Relative permeability, µ r ( 1 3 ) 27JGS (Developed) 27JGH 2 (Conventional) 27JGH (Conventional) Magnetizing force, H (A/m) Magnetizing force, H (A/m) Fig. 13 Magnetization and permeability curves of 27JGS and 27JGH on Magnetics. vol. 34, no. 4, 1998, p JFE p S BLDC 13 vol. 29no p B5 B JGE Si JFE JGS AEM vol. 7no p RM p vol. 35 no p SPC IEA p. 61 1Namikawa, M.; Ninomiya, H.; Tanaka, Y.; Nakada, Y. IEEE Transactions 63 JFE No

75 unit: mm Fig. Structure of model three-phase stacked transformer cores (a) Alternate-lap joint (b) Step-lap joint 3 4)

75 unit: mm Fig. Structure of model three-phase stacked transformer cores (a) Alternate-lap joint (b) Step-lap joint 3 4) 3 * 35 (3), 7 Analysis of Local Magnetic Properties and Acoustic Noise in Three-Phase Stacked Transformer Core Model Masayoshi Ishida Kenichi Sadahiro Seiji Okabe 3.7 T 5 Hz..4 3 Synopsis: Methods of local