the working principle of rotary encoder！

Rotary encoder in factory automation (FA) on the application has been a fairly long period of time, the most representative of is in the industry robot; robot manipulator with two shaft, also have multiple axis, but driving mechanical arm movements are motor on the robot structure, all of the mechanical arm action kinetic energy is the source of motor.Most of the FA and OA equipment main energy sources is also the motor; and the motor affected by different forms of control instruction.On the operation of the motor control mode are only in a certain period of time at a certain speed, but also have complicated and irregular operation, there are multiple shaft running at the same time, it formed a machinery equipment every kind of operation state.Motor control is usually speed control and displacement (turning volume) control, control way is with the motor types is not the same as.For example, the stepper motor to move the control, in the control condition, the rotation angle (LAPS) is a real time control system pulse synchronized changes, unless the out-of-step and other special circumstances, otherwise should be strictly synchronous mobile.In addition to the stepper motor, the other motor rotation detection, if there is no signal feedback to achieve precise control is very difficult.In conclusion, motor speed control, such as to control quantity, and feedback to the control circuit, the motor is maintained at a certain speed, or stop at a certain position.In general, this rotation by the rotary encoder to detect the amount of feedback

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