The principle of photoelectric encoder ！

a photoelectric conversion of the mechanical axis output geometric displacement amount is converted into electrical pulses or electronic digital quantity  sensor.It is currently most used sensors, photoelectric encoder is composed of grating disc and a photoelectric detection device.The grating disc is in a certain diameter circular plate uniformly provided fan transmission channel.  Due to the photoelectric encoder is coaxial with the motor, when the motor rotates, the grating disc and the motor synchronous rotation, the light emitting diodes and other  electronic components of the detecting device detects the number of output pulse signal, through the calculation in a certain period of time the number of output pulses can reflect the current motor speed.In addition, in order to determine the direction of rotation, the encoder can also provide electrical phase difference of 90 degrees pulse signal. Incremental encoder  Incremental encoder is the direct use of photoelectric conversion principle three set of output square wave pulsed A, B and Z; A, B group of two pulse phase difference of 90 degrees Z phase for each turn of a pulse, for the datum point positioning.It has the advantages of simple principle, mechanical life expectancy in the tens of thousands of hours, strong anti-interference ability, high reliability, suitable for long distance  transmission.Its disadvantage is the inability to rotation of the output shaft of the absolute position information.  Solid shaft encoder type installation notes
• the encoder shaft and the user end between the output shaft with elastic soft connection, in order to avoid user shaft series, beating caused damage and encoder encoder shaft.
• when install the permitted axle load.
• should ensure that the encoder shaft and the output shaft axis of different users of <0.20mm, and the axis angle <1.5 °.The installation is prohibited to percussion and knocking, so as not to damage the shafting and code

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