Masayoshi Ishida
,
Seiji Okabe
,
Takeshi Imamura
,
Michiro Komatsubara
材料科学技术（英文）
The dependence of transformer performance on the material properties was investigated using two laboratory-processed 0.23 mm thick grain-oriented electrical steers domain-refined with electrolytically etched grooves having different magnetic properties. The iron loss at 1.7 T, 50 Hz and the flux density at 800 A/m of material A were 0.73 W/kg and 1.89 T, respectively, and those of material B, 0.83 W/kg and 1.88 T. Model stacked and wound transformer core experiments using the tested materials exhibited performance well reflecting the material characteristics. In a three-phase stacked core with step-lap joints excited to 1.7 T, 50 Hz, the core loss, the exciting current and the noise level were 0.86 W/kg, 0.74 A and 52 dB, respectively, with material A, and 0.97 W/kg, 1.0 A and 54 dB with material B. The building factors for the core losses of the two materials were almost the same in both core configurations. The effect of higher harmonics on transformer performance was also investigated.
关键词:
Atsuhito Honda
,
Masaki Kawano
,
Masyoshi Ishida
,
Kejji Sato
,
Michiro Komatsubara
,
Isamu Ohyama
材料科学技术（英文）
The performance of a 3-phase 6-pole 400 W inverter-drive induction motor was investigated using a variety of non-oriented electrical steels for stator core at PWM inverter fundamental wave frequencies of 30 to 300 Hz. There existed an optimum Si content of the material depending on the tooth flux density. Both reduction of material thickness and stress-relief annealing of the stator core improved the motor efficiency. The influence of Si content on the efficiency was small at lower PWM frequencies, while at higher frequencies the motor efficiency increased with increasing Si content. The Cu loss W-c increased and the Fe loss W-i counteractively decreased with increasing Si content at lower frequencies, while at higher frequencies W-i had dominant effect on the efficiency. Newly developed materials RMA, having lower Fe tosses after stress-relief annealing and higher flux densities with lower Si contents, showed motor efficiencies superior to conventional JIS grade materials with comparable Fe losses.
关键词:
