IC697CPU772RR
IC697CPU772RR
IC697CPU772RR
作为伺服机,交流伺服电机除了必须具有线性度很好的机械特性和调节特性外,还必须具有伺服性:即控制信号电压强时,电动机转速高;控制信号电压弱时,电动机转速低;若控制信号电压等于零,则电动机不转。
但是普通异步电动机的转速不是转矩的单值函数,而且只能在一定范围内稳定运行,作为驱动用途的电动机,这一特性是合适的。但作为伺服电动机,则要求机械特性必须是单值函数并尽量具有线性特性,以确保在整个调速范围内稳定运行。为满足这一要求,通常的做法是,加大转子电阻,使得产生大转矩时的转差率。使电动机在整个调速范围内接近线性。一般情况下,转子电阻越大,机械特性越接近线性,但堵转转矩和大输出功率越小,效率越低。因此,交流伺服电机的效率比一般驱动用途的电机低。
之交流伺服电机必须有线性度好的机械特性和调节特性外,还必须具有伺服性。
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GIDDINGS & LEWIS 1-20601-01 USPP 12060101
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