自动门
自动门:直流无刷电动机运行特性和传递函数
发布时间:2013/10/7
自动门讯:
直流无刷电动机运行特性和传递函数
    因为直流无刷电动机特殊的换相工作方式,导致了电动机内部气隙磁场的非线性,从
而带来电磁转矩的脉动和感应电动势的脉动。所以要十分精确地分析直流无刷电动机的运
行特性是非常困难的。在工程中通常做出以下假设,然后再推导其各参数的关系式:
    (1)电动机的气隙磁感应强度沿气隙按正弦分布。
    (2)绕组通电时,该电流所产生的磁通对气隙磁通的影响忽略不计。
    (3)控制电路在开关状态下工作,功率晶体管压降AUT为恒值。
    (4)各相绕组对称,其对应的电路单元完全一致,相应的电气时间常数忽略不计。
    (5)位置传感器等控制电路的功耗忽略不计。
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