详情：WOODWARD 9905-463  数字速度控制模块

9905463制造商已停产速度控制模块数字的

1.1光电编码器

编码器是传感器的一种，主要用来检测机械运动的速度、位置、角度、距离和计数等，许多马达控制均需配备编码器以供马达控制器作为换相、速度及位置的检出等，应用范围相当广泛。按照不同的分类方法，编码器可以分为以下几种类型:

根据检测原理，可分为光学式、磁电式、感应式和电容式。

根据输出信号形式，可以分为模拟量编码器、数字星编码器。

根据编码器方式，分为增量式编码器、绝对式编码器和混合式编码器。

光电编码器是集光、机、电技术于一体的数字化传感器，主要利用光栅衍射的原理来实现位移——数字变换，通过光电转换将输出轴上的机械几何位移量转换成脉中或数字量的传感器。典型的光电编码器由码盘、检测光栅、光电转换电路（包括光源、光敏器件、信号转换电路)、机械部件等组成。光电编码器具有结构简单、精度高、寿命长等优点，广泛应用于精密定位、速度、长度、加速度、振动等方面。

这里我们主要介绍SIMATIC S7系列高速计数产品普遍支持的增量式编码器和绝对式编码器。

1.2增量式编码器

增量式编码器提供了一种对连续位移量离散化、增量化以及位移变化(速度）的传感方法。增星式编码器的特点是每产生一个输出脉冲信号就对应于一个增量位移，它能够产生与位移增星等值的脉冲信号。增星式编码器测量的是相对于某个基准点的相对拉置增星，而不能够直接检测出绝对位置信息。

如图1-1所示，增星式编码器主要由光源、码盘、检测光栅、光电检测器件和转换电路组成。在码盘上刻有节距相等的辐射状透光缝隙，相邻两个透光缝隙之间代表一个增量周期。检测光栅上刻有A、B两组与码盘相对应的透光缝隙，用以通过或阻挡光源和光电检测器件之间的光线，它们的节距和码盘上的节距相等，并且两组透光缝隙措开1/4节距，使得光电检测器件输出的信号在相位上相差90°。当码盘随着被测转轴转动时，检测光栅不动，光线透过码盘和检测光栅上的透过缝隙照射到光电检测器件上，光电检测器件就输出两组相位相差90°的近似于正弦波的电信号，电信号经过转换电路的信号处理，就可以得到被测轴白的转角或速度信息。

9905463 The manufacturer has discontinued digital speed control modules

1.1 Photoelectric encoder

Encoder is a kind of sensor, mainly used to detect the speed, position, Angle, distance and count of mechanical motion, many motor control need to be equipped with encoder for motor controller as commutation, speed and position detection, etc., the application range is quite wide. According to different classification methods, encoders can be divided into the following types:

According to the detection principle, it can be divided into optical type, magnetoelectric type, induction type and capacitive type.

According to the output signal form, it can be divided into analog encoder and digital star encoder.

According to the encoder method, it is divided into incremental encoder, absolute encoder and hybrid encoder.

Photoelectric encoder is a digital sensor integrating optical, mechanical and electrical technology. It mainly uses the principle of grating diffraction to realize displacement-digital transformation, and converts the mechanical geometric displacement on the output axis into a pulse or digital sensor through photoelectric conversion. A typical photoelectric encoder consists of a code disc, a detection grating, a photoelectric conversion circuit (including a light source, a photosensitive device, a signal conversion circuit), a mechanical component, etc. The photoelectric encoder has the advantages of simple structure, high precision, long life and so on, and is widely used in precision positioning, speed, length, acceleration, vibration and so on.

Here we mainly introduce the incremental encoders and absolute encoders generally supported by SIMATIC S7 series high-speed counting products.

1.2 Incremental encoder

Incremental encoders provide a sensing method for discretization, increment, and displacement change (velocity) of continuous displacement. The characteristic of the star-increasing encoder is that each output pulse signal is corresponding to an incremental displacement, and it can generate a pulse signal equivalent to the displacement star-increasing. The increasing star encoder measures the relative pull of the increasing star relative to a reference point, but cannot directly detect the absolute position information.

As shown in Figure 1-1, the increasing star encoder is mainly composed of a light source, a code disk, a detection grating, a photoelectric detection device and a conversion circuit. There are radiative light transmission gaps with equal pitch carved on the code disc, and the interval between the two adjacent light transmission gaps represents an incremental period. The detection grating is engraved with two groups of light transmission gaps corresponding to the code disc, A and B, to pass or block the light between the light source and the photoelectric detection device, their pitch and the pitch on the code disc are equal, and the two groups of light transmission gaps are opened by 1/4 pitch, so that the photoelectric detection device output signal in phase difference of 90°. When the code disc rotates with the measured axis, the detection grating does not move, and the light shines through the gap between the code disc and the detection grating to the photoelectric detection device, the photoelectric detection device outputs two sets of electrical signals that are approximately sine wave with a phase difference of 90°, and the electrical signals are processed by the conversion circuit to obtain the Angle or speed information of the measured axis white.

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