AB产品变频器22A-B2P3N104

22A-B2P3N104

22A-B2P3N104

舵机主要是由外壳、电路板、无核心马达、齿轮与位置检测器所构成。 其工作原理是由接收机发出讯号给舵机，经由电路板上的IC判断转动方向，再驱动无核心马达开始转动，透过减速齿轮将动力传至摆臂，同时由位置检测器送回讯号，判断是否已经到达定位。 位置检测器其实就是可变电阻，当舵机转动时电阻值也会随之改变，藉由检测电阻值便可知转动的角度。

舵机厂商提供的规格资料，通常都会包含外形尺寸（mm）、扭力（kg／cm）、速度（秒／60°）、测试电压（V）及重量（g）等基本资料。 扭力的单位是kg／cm，意思是在摆臂长度1公分处，能吊起几公斤重的物体。 这就是力臂的观念，因此摆臂长度愈长，则扭力愈小。 速度的单位是sec／60°，意思是舵机转动60°所需要的时间。

伺服电机

伺服电机又称执行电动机，在自动控制系统中，用作执行元件，把所收到的电信号转换成电动机轴上的角位移或角速度输出。 分为直流和交流伺服电动机两大类，其主要特点是，当信号电压为零时无自转现象，转速随着转矩的增加而匀速下降。

伺服电机主要靠脉冲来定位，基本上可以这样理解，伺服电机接收到1个脉冲，就会旋转1个脉冲对应的角度，从而实现位移，因为，伺服电机本身具备发出脉冲的功能，所以伺服电机每旋转一个角度，都会发出对应数量的脉冲，这样，和伺服电机接受的脉冲形成了呼应，或者叫闭环，如此一来，系统就会知道发了多少脉冲给伺服电机，同时又收了多少脉冲回来，这样， 就能够很的控制电机的转动，从而实现的定位，可以达到0.001mm。

伺服电机分为交流伺服和直流伺服两大类。

交流伺服电机分为异步型交流伺服电动机、同步型交流伺服电动机两类。

直流伺服电机分为有刷和无刷电机。 有刷电机成本低，结构简单，启动转矩大，调速范围宽，控制容易，需要维护，但维护不方便（换碳刷），产生电磁干扰，对环境有要求。 因此它可以用于对成本敏感的普通工业和民用场合。

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