MOTOROLA MVME226-1 1GB DYNAMIC MEMORY VME MODULE (01-W3510B) - USED 2.濾波器與驅動系統的等值電路在電動機端子上安裝阻抗匹配器可以很大程度±也消弱過電壓，簡單的是并聯個與電纜的波阻抗接近的電阻，但由于電纜的波阻抗很小，如電力電纜為050，雙絞線為20這樣在屯阻的功耗很大，達到數百至數千閃此實際中+宜采用純電阻匹配器，而應采用阻抗匹配與濾波于體的低通濾波器。為了減小濾波器的尺寸和造價，宜采用無源階8，低通阻尼濾波器。
該濾波器是將電阻和電容串聯后并接在電機接線端子相相上，根據傳輸線次波過程的彼得遜了的等值電路，其中2，溈等效電源電壓，幻即為變頻器輸出電壓，心為電纜波阻抗。乙，為電相繞組波阻抗。穴為濾波器電肌為濾波器電容。
以前研宄中2己經證實，在通用，厘驅動變頻器的載波頻率60，5出下，平均脈沖寬度在數十微秒以上，在脈沖上升沿處的波過程時間大為2030心，因此在分析，添驅動變頻器輸出的連續脈沖的波過程時，可用個梯形波或斜角波的波過程來，即變頻器的輸出電壓為階躍函數。
電纜的波阻抗辦可通過測量單位長度的電容，和單位長度的電感來求得。本文采用低壓相，緣護套屯纜線，測得相相間0約為7.607.約為6.507取，從而根據Zo=jL，C，求得約為92這里適當考慮電源的內阻抗和電纜導體電阻，因此中的電纜波阻抗可近似取為00，電動機是電感性負載，且為小容試。代波阻抗，遠大于電纜的波附抗，2.2濾波器的和，電動機端電壓波形的影響于阽升沿的電，波來說。濾波器的電6可認為是零波阻抗，相當于短路，如果取濾波器電阻及的阻值與電纜的波阻抗心相等，而電動機的波肌抗乙，又遠大于心，則負載阻抗近似為電阻值，這樣來，電纜末端的負載阻抗與電纜的波；抗相匹配那么在電動機端就+會產.電樂波的全反射。也就不會形成過電壓。 濾波器的電容如何定，原則上其電容值越大，阻抗的匹配性就越，則過電壓就越小。但是，隨著電容值的增大，電阻上的功率損耗就，加，因為在連續矩形脈沖電壓下，濾波器付相電阻的功耗戶近似為廠相濾波器。電阻的總功耗則為3于普迎型變頻器約為600心5.低噪聲型變頻器約為85扭2，而于特殊變頻器可達到2，kliz=，HtS4OOV.C3O.iyF.UklO則電阻上的總功耗480反，隨宇；慮波器功耗實際應用中，如濾波器不能進行專門設計，就電機系統中波過程等值電路匹配程度電動機端子上過電壓的影響如何，本文在不同的電纜長度3，45和75心。
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