Pulse encoder structure
Pulse encoder shown in Figure 1. On the circumference of a disc engraved with equally spaced lined, divided into transparent and opaque sections, called circular grating. Rotates together with the operating shaft angle encoder. Circle gratings, placed parallel to a stationary fan-shaped sheet, called index grating, the above system has shifted by 1/4 pitch two slits (slits resolution). In addition, there is a zero slot (one pulse per revolution). Pulse generator connector or bond servo motor connected via cross.
Pulse encoder structure of FIG. 1
Pulse encoder principle
When rotated together with the operating shaft angle encoder, the light through the lined portion of the two gratings to form light and dark stripes. Optoelectronics accept these light and dark optical signal, and converted to electrical signals of alternating. The electrical signal is approximately sinusoidal current signal groups A and B, as shown in Fig. A and B signals out of phase 90 °, amplified and shaped into a square wave. By signals from the two gratings, there is a "pulses per revolution", known as Z-phase pulse, which is processed by the above come. Z pulse is used to generate the machine reference point. Later pulse is supplied to the counter, according to the number and frequency of the pulses can be measured angle and speed work shaft. Its resolution depends on the number of turns of multiple segments and measuring lines round grating.
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