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三相異步電機測試雜散損耗知識


 三相異步電機測試臺的損耗一般可分為定子銅損、轉子鋁(銅)耗、鐵耗、風摩損和雜散損耗。雜散損耗也可理解為除三相異步電機測試臺的定子銅損、轉子鋁(銅)損、鐵損和風摩損之外,無法定量計算的一部分損耗。雜散損耗值偏大,不僅使電機的效率下降,也會造成電機的溫升升高。因此,對雜散損耗不應小覷。

 
     雜散損耗產生的原因比較復雜,一般雜散損耗的大小與電動機的設計參數、加工工業質量、裝配質量等因素有關。雜散損耗值的測量是否準備與測量方法密切相關。雜散損耗尚無法準確計算,20世紀70年代在組織開展Y系列三相異步電機測試臺全國統一設計時,推薦2極電機的雜散損耗值為輸出功率的2.5%,4極電機的雜散損耗值為輸出功率2.0%,6極電機的雜散損耗值為輸出功率1.5%,8極電機的雜散損耗值為輸出功率1.0%。上述推薦值有一定的合理性,但與電動機的實際情況還有些差異。由于雜散損耗值的準確測量較困難,隨著改革開放后我國三相異步電動的大量出口,為與國際交流與互換的方便,在考核三相異步電動機的效率時,統一將雜散損耗值改為按輸入功率的0.5%計算。為此,以后的Y系列、Y2系列、Y3系列三相異步電動機和YX3系列高效率三相異步電動機也都按此考慮。
 
      The wastage of the three-phase asynchronous motor stator copper loss in general can be divided into aluminum (copper), rotor loss, iron loss, wind friction loss and stray loss. Stray loss can also be interpreted as in addition to the three phase asynchronous motor stator copper loss, rotor aluminum (cu), iron loss and wind friction losses, not part of the quantitative calculation of wear and tear. Stray loss value is big, not only lowered the efficiency of the motor, can also cause the rise of temperature of the motor. Therefore, the stray loss should not be underestimated.
 
       The causes of stray loss is more complex, generally the size of the stray loss and the design parameters of the motor and the quality of processing industry, assembly quality and other factors. Stray loss value whether preparation and measurement methods are closely related. Stray loss is unable to accurately calculate, the 1970 s in the organization to carry out the unified national Y series three-phase asynchronous motor design, recommend the stray loss of value for the 2 pole motor output power of 2.5%, the stray loss value of 4 pole motor power output by 2.0%, the stray loss value of 6 pole motor output power 1.5%, 8 pole machine the stray loss of value of output power by 1.0%. The recommended value has certain rationality, but still have some differences with the actual situation of the motor. Due to stray loss value of accurate measurement is difficult, after reform and opening up, China's exports of three-phase asynchronous electric, for the sake of with international communication and exchange, in the assessment of the efficiency of the three-phase asynchronous motor, unity will stray loss value calculated at 0.5% of the input power. For this, after Y series, Y2, Y3 series three phase asynchronous motor and YX3 series high efficiency three phase asynchronous motor are also considered by this.

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