Whenever mechanical rotary motions have to be monitored, the encoder is the most important interface between the mechanics and the control unit. Encoders transform rotary movement into a sequence of electrical pulses. A number of bright/dark segments on a disc are photoelectrically scanned. The number of segments determine the resolution of the movement and hence the accuracy of the position. Because only increments of rotation are detected with a single channel, an additional signal, phase shifted by 90 degrees, is generated by inserting a grid diaphragm. This 90 degrees out of phase signal enables, together with the initial signal, the direction of rotation to be determined. Once per revolution a reference signal may also be generated.
- Precise angle measurement
- RPM or direction of rotation measurement
- X/Y positioning tables
- Positioning in handlings-systems