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詳情：WOODWARD 9905-463  數字速度控制模塊

9905463制造商已停產速度控制模塊數字的

1.1光電編碼器

編碼器是傳感器的一種，主要用來檢測機械運動的速度、位置、角度、距離和計數等，許多馬達控制均需配備編碼器以供馬達控制器作為換相、速度及位置的檢出等，應用范圍相當廣泛。按照不同的分類方法，編碼器可以分為以下幾種類型:

根據檢測原理，可分為光學式、磁電式、感應式和電容式。

根據輸出信號形式，可以分為模擬量編碼器、數字星編碼器。

根據編碼器方式，分為增量式編碼器、絕對式編碼器和混合式編碼器。

光電編碼器是集光、機、電技術于一體的數字化傳感器，主要利用光柵衍射的原理來實現位移——數字變換，通過光電轉換將輸出軸上的機械幾何位移量轉換成脈中或數字量的傳感器。典型的光電編碼器由碼盤、檢測光柵、光電轉換電路（包括光源、光敏器件、信號轉換電路)、機械部件等組成。光電編碼器具有結構簡單、精度高、壽命長等優(yōu)點，廣泛應用于精密定位、速度、長度、加速度、振動等方面。

這里我們主要介紹SIMATIC S7系列高速計數產品普遍支持的增量式編碼器和絕對式編碼器。

1.2增量式編碼器

增量式編碼器提供了一種對連續(xù)位移量離散化、增量化以及位移變化(速度）的傳感方法。增星式編碼器的特點是每產生一個輸出脈沖信號就對應于一個增量位移，它能夠產生與位移增星等值的脈沖信號。增星式編碼器測量的是相對于某個基準點的相對拉置增星，而不能夠直接檢測出絕對位置信息。

如圖1-1所示，增星式編碼器主要由光源、碼盤、檢測光柵、光電檢測器件和轉換電路組成。在碼盤上刻有節(jié)距相等的輻射狀透光縫隙，相鄰兩個透光縫隙之間代表一個增量周期。檢測光柵上刻有A、B兩組與碼盤相對應的透光縫隙，用以通過或阻擋光源和光電檢測器件之間的光線，它們的節(jié)距和碼盤上的節(jié)距相等，并且兩組透光縫隙措開1/4節(jié)距，使得光電檢測器件輸出的信號在相位上相差90°。當碼盤隨著被測轉軸轉動時，檢測光柵不動，光線透過碼盤和檢測光柵上的透過縫隙照射到光電檢測器件上，光電檢測器件就輸出兩組相位相差90°的近似于正弦波的電信號，電信號經過轉換電路的信號處理，就可以得到被測軸白的轉角或速度信息。

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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