How is the incremental encoder built into the servo motor for low speed measurement?！

Servo motor through the built-in encoder and servo controller constitutes a closed-loop control system. Servo controller is incremental encoder feedback by the number of pulses to obtain the motor rotation speed. According to the pulse count to measure the speed of the following three methods:
     1, within a specified time to measure the number of pulses generated to obtain the measured speed, known as the M method of speed.
     2, measuring the time between two adjacent pulses to obtain the measured speed, known as the T method velocity.
     3, at the same time measuring the detection time and pulse generator in this time the number of pulses to measure the speed, known as the M / T method of speed.
     In the above three methods, M method is suitable for measuring high speed, can obtain higher resolution; T method is suitable for measuring lower speed, can obtain higher resolution; and M / T law regardless of high speed, low speed Are suitable for measurement.

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