Speed measurement system capable of improving speed control precision of incremental photoelectric encoder

Abstract

The invention discloses a speed measurement system capable of improving the speed control precision of an incremental photoelectric encoder. The speed measurement system comprises the incremental photoelectric encoder, a differential speed measurement module, a speed instruction input end, a speed P control module, a current loop, a motor, an integration module and a speed I control module, wherein one path of the incremental photoelectric encoder is connected with an input end of the motor through the differential speed measurement module, the speed P control module and the current loop in sequence, and one path of the speed instruction input end is connected with the input end of the motor through the speed P control module and the current loop in sequence; and the other path of the speed instruction input end is connected with the input end of the motor through the integration module, the speed I control module and the current loop in sequence, and the other path of the incremental photoelectric encoder is connected with the input end of the motor through the speed I control module and the current loop in sequence. The speed measurement system can effectively reduce the speed feedback calculation error caused by position differentiation, so that the speed control absolute precision is improved, and the machining precision and other control performance of mechanical equipment are improved.

Description

technical field [0001] The invention relates to a technology for improving the speed control precision of an incremental photoelectric encoder, in particular to a speed measuring system capable of improving the speed control precision of an incremental photoelectric encoder. Background technique [0002] Such as figure 1 As shown, it is the existing frequency converter or servo drive with encoder (PG) speed control method, using position differentiation to obtain the feedback speed, and then calculating the torque command through the speed PID closed loop. The torque command is converted by the coefficient to obtain the torque current command and the excitation current command. Two current commands are sent to the current loop to complete the current loop control. The current loop is used as the inner loop of the speed loop. [0003] Among them, the incremental photoelectric encoder adopts the method of M method, T method or MT method to obtain the result of differential ...

AI Technical Summary

Problems solved by technology

Due to the inherent speed measurement error in the speed measurement accuracy of the above speed measurement method, the speed control accuracy after the speed PID closed loop is not high

Images