Dual-loop Control and Error Analysis of Performance Detector of Micro-pressure Springs
Mingming Zhao · Yibiao jishu yu chuanganqi · 2013
The performance of the symmetrical spring in the inductance sensor is the main factor to affect the measurement accuracy.In the detector of micro-pressure spring,dual closed-loop control was used to reduce the error caused by losing synchronization of the stepper motor and the guide screw gap.The detector could accurately measure the stiffness and the elastic value of the spring in any position among the elastic range.The main control unit selected MSP430F149,low-power microcontrollers,to improve response time,and used CS5532,high-precision A/D converter,to raise the resolution of data acquisition circuit.The extreme value filtering algorithm was chosen to improve the accuracy of pressure measurement.The experimental results show the displacement error is 2 μm,and the pressure error is 1 mgf.