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  • 電動汽車電動輪驅動技術及其簡介

    • 2019-06-21 11:07
    • 來源:行業知識及專業技術

    摘要:電動輪作為獨立的驅動部件,集電動機、傳動機構、制動器等部件于輪轂內,是一種獨特的驅動單元,其驅動技術及應用原理。

    電動輪驅動技術

    電動輪作為獨立的驅動部件,集電動機、傳動機構、制動器等部件于輪轂內,是一種獨特的驅動單元。

    電動輪驅動的電動車取消了傳統的機械差速器,在轉向時需要調節兩側的轉速來實現差速功能。

    傳統車輛的左、右輪是通過機械式轉向梯形相連接的。一般良好路面上,左、右轉向輪驅動力產生的繞主銷的力矩大小基本相等,方向相反,因此相互抵消。

    而電動輪驅動汽車由于各輪轉矩獨立可控,轉彎時左、右轉向輪的驅動力可以不相等,驅動力對主銷軸線的力矩將不再能互相抵消,也就是說驅動轉向力矩不再為零。由于兩轉向輪是通過轉向梯形相連接的,驅動轉向力矩將會驅動兩轉向輪轉向。

    因此,對電動輪驅動的汽車,在保證直線行駛穩定的同時,理論上按照一定規律,實時控制左、右轉向輪的輸出轉矩,將可以利用產生的驅動轉向力矩實現助力轉向的作用。

    電動輪驅動技術簡介

    電動輪驅動技術是用四個或多個獨立控制的電動輪,來分別為車輛的車輪提供驅動轉矩。動力源與車輪之間沒有機械傳動環節。典型的電動輪結構如圖7-1所示。

     電動汽車電動輪驅動技術及其簡介

    圖7-1 典型的電動輪結構

    (1)電動輪驅動動力系統結構形式及特點電動輪動力系統主要分為兩種結構形式:一種是基于內轉子型電動機的電動輪系統;另一種是基于外轉子型電動機的電動輪系統。圖7-2所示為這兩種電動輪系統的結構簡圖,圖(a)中轉子在永磁體內部;圖(b)中轉子在永磁體外部。

    圖7-2 電動輪系統結構簡圖1—輪胎;2—輪輞;3—制動器;4—定子繞組;5—永磁體;6—轉子;7—電機控制器;8—減速齒輪;9—軸承

     電動汽車電動輪驅動技術及其簡介

    目前,基于內轉子型電動機的電動輪系統,采用高轉速低轉矩特性的電動機。為了滿足車輪實際轉速的要求,通常需匹配一個相應的行星齒輪減速機構。基于外轉子型電動機的電動輪系統,則采用低轉速高轉矩特性的電動機。由于轉速范圍符合車輪實際轉速要求,通常無需匹配減速機構,由電動機外轉子直接驅動車輪。典型的電動輪系統布置形式如圖7-3所示。四個電動輪作為獨立驅動元件驅動汽車。

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    關閉
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