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R911306439 In the servo drive speed closed loop, the real-time speed measurement accuracy of the motor rotor is crucial to improving the dynamic and static characteristics of the speed control of the speed loop.

R911306439 In order to seek a balance between measurement accuracy and system cost, incremental photoelectric encoders are generally used as speed measurement sensors, and the corresponding commonly used speed measurement method is the M/T speed measurement method.

R911306439 Although the M/T speed measurement method has certain measurement accuracy and a wide measurement range, this method has its inherent flaws, which mainly include: 1) At least one complete code disk pulse must be detected within the speed measurement cycle, which limits the minimum Rotation speed can be measured; 2) The two control system timer switches used for speed measurement are difficult to maintain strict synchronization, and speed measurement accuracy cannot be guaranteed in measurement situations with large speed changes.

R911306439 Therefore, the traditional speed loop design scheme using this speed measurement method is difficult to improve the speed following and control performance of the servo drive.

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