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題 名 | 輕載感應電動機之省電研究--定轉差率法 |
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作 者 | 何文德; | 書刊名 | 技術學刊 |
卷 期 | 10:1 1995.03[民84.03] |
頁 次 | 頁127-137 |
分類號 | 448.22 |
關鍵詞 | 省電; 等效電路; 定轉差率; 無載損失; 任務週期; Energy saving; Equivalent circuit; Constant-slip; No-load loss; Duty cycle; |
語 文 | 中文(Chinese) |
中文摘要 | 許多電動機負載如工業用縫紉機、沖床等,其負載變化頻繁且為間歇性,此等負載多數時間為無載狀態而滿載時間很短,無載時如將電動機切離電源,須要時再接上電源,則因起動過份頻繁,除巨大起動電流造成對線路之干擾外,亦必影響其工作速度。故任務週期較小的負載,其綜合效率變成相當低,對此等負載如能在輕載或無載時將電源電壓適度降低則可以大幅減少其無載損失使其綜合效率提高。本文研究以定轉差率法作調整,針對5部電動機作實例計算研究,在任務週期為10%的綜合效率,經調整後其綜合效率提高14.90至26.37%.因無載損 失與電壓之關係並不能純以線性系統數學理論分析計算,故本文之計算係用電動機設計計算用軟體,以電動機各部之實際尺寸及其所使用的材料代入計算,對於鐵心磁化特性之非線性及其鐵損之變化情形等均自實際使用的鐵心磁化曲線及鐵損曲線取出計算,己能充份考慮鐵心飽和特性及其他非線性特性之影響。最後並用電路分析用軟體PSPICE模擬分析一感應電動機在此種控制下的動態特性。 |
英文摘要 | The loads of a large number of electric motors such as sewing machines or press machines vary frequently and instantaneously. Most of the time, these motors are without loads. The interval of running full load is usually very short. But it is not suitable to cut off the power source under no load condition because a large starting current will be incurred from time to time which will disturb the power system and affect speed of the work. Therefore, the efficiency is generally low for the motor with short duty cycle. However, if the input voltage is reduced for no-load and light -load conditions, the efficiency can be increased. In this paper, 5 different motors are taken as implementation examples to achive this goal by the constant slip method. It is found that the efficiency of these motors under 10% duty-cycle loading is increased to between 14.90% to 26.37% respectively. Since the relation between the no-load loss and voltage cannot be analyzed by linear system mathernatical derivation, the calculation of efficiency is obtained by the software for motor design. By giving the dimension and material of each part of the motor, the nonlinearity of iron core's magnetizing characteristics and the variation of the iron loss are both calculated by iron core's magnetizing curve and the iron-loss curve. Both saturation and nonlinearity have been taken into consideration for calculation. Finally, a software PSPICE is used to analyze the dynamic characteristics of the motor which is controlled by the method proposed in this paper. |
本系統中英文摘要資訊取自各篇刊載內容。