三相感應馬達間歇性超額定負載溫升特性之研究

The Research of Three Phase Induction Motor with Interval Over Loading Temperature Rising Characteristic

郭海濱(Hai- Pin Kuo (Paul))

指導教授 ： 謝聰烈

共同指導教授 ： 周煥銘(Huann-Ming Chou)

崑山科技大學/工程學院/機械工程研究所/碩士(2008年)

摘要

三相感應馬達於固定損與負載損相等時效率最高，通常將最大輸出效率點設計於額定負載附近，即介於額定負載之75%至125%範圍內，而其最大功率因數點則在額定負載125%至150%之間。在具有間歇性巔峰負載的工業應用場合，如採用大容量的感應馬達運轉時，在輕負載之運轉時效率極差，且成本高，又不符合效益，若用較小容量的感應馬達在150% 額定負載其功率因素特性會更有效益，並符合現今因原物料短缺、物價大漲及小型化之需求。本文提出高可靠度之三相感應馬達間歇性超額定負載應用法則，首先根據馬達銅線絕緣溫度等級，直接加超額定負載至溫升達安全額定銅線絕緣溫度時，再做連續間歇性卸載及加超載實驗，並於超載期間馬達溫升須保持在規格範圍內，即可得到馬達間歇性超負載之週期值。如果直接以時間表做相同間歇性超額定負載實驗，因時間表不能被預期則必須於實驗中隨時修正，將浪費時間及能源，若以本文直接加載法之週期值的時間表操作則可得相同結果。由實驗結果兩方法相比較則直接加載法可省能源達46%及減少操作時間達51%。

關鍵字

超額定負載 ； 間歇性操作

並列摘要

The maximum output efficiency of three phase induction motor is normally designed at 75% to 125% of loading rate. Because under such condition the motor’s constant loss is equal to the loading loss, and the maximum power factor efficiency is at 125% to 150% of the loading rate. When we need to use such motor, especially big capacity ones, in interval power supply environment, we suffer from high cost and low efficiency when the loading is not fully occupied. Therefore, use the 150% of loading rate to get the maximum output efficiency will be more economy of scale and save the energy than use a bigger motor but lighter loading in demand.
This thesis introduces a new method to apply to this condition. The method is loading an over load of rate to gain the temperature approach the maximum isolated temperature according to its degree of cooper wire. Then unloading and loading again repeatedly to create a stable constant interval to form a periodic table. From the experiment it has proven using this method will never overheat the isolated temperature. And compared the way use the time chart that offered by the periodic table with loading and unloading repeated in condition of interval from beginning can save energy about 46% and 51% less experiment time. Without the time chart from the periodic table will waste more energy and experiment time because the time chart can’t be predicted in advance

並列關鍵字

Over loading of rate ； Interval feature of over loading

參考文獻

[9] H.M.B. Metwally, “Loadless full load temperature rise test for three pahse induction motors,” Energy Conversion and Management 42 (2001) 19-528.

[10] Y. Huai, R.V.N. Melnik, and P.B. Thogersen, “Computational analysis of temperature rise phenomena in electric induction motors,” Applied Thermal Engineering 23 (2003) 779-795.

參考文獻

[1] 中國國家標準CNS2394-C4088低壓三相鼠籠型感應電動機(一般用)，中華民國88年8月31日修定。

[2] 中國國家標準CNS14400-C4482低壓三相鼠籠型高效率感應電動機(一般用)，中華民國92年9月9日修定。