Abstract
With the developing of information society, in today's industrial sector, rotary speed of measurement and control become increasingly important. Bending machine especially for the motor speed control is strict, too fast or too slow speed will affect the quality of profiles, so that pipe rupture or wrinkling the surface, so only the high-precision detection speed can be high-precision control system.There are many traditional methods of speed measurement, they are the lower measurement accuracy and preva lent, such as the shortcomings of the complexity of the testing process. For this reason, this article describes the classification of rotary encoder,velocimetry principle and rotary encoder to design a single-chip combination of a speed measurement and control systems.The results show that the measurement is stable, reliable operation，it has high measurement precision, fill the requirements of the system fully. Its simple circuit design and typical circuit control method has a certain reference value.
Keywords：Rotary speed; Rotary encoder; Single-chip
