基于角度传感器光电控制技术的研究

光电信号的波形质量,将直接影响测量仪器的精度和性能。为此,许多从事设计工作的技术人员,都千方百计地采取各种方法和技术措施,提高光电变换波形质量,尽可能达到传递数据稳定可靠。本文将在角度传感器光电变换过程中,重点阐述外界因素对光电信号产生的影响及怎样确保电信号波形质量的研究。

Influence of electric parameters on MAO of AZ91D magnesium alloy using alternative square-wave power source

Micro-arc oxidation （MAO） process was carried out on AZ91D alloy in alkaline borate solution using an alternative square-wave power source with different parameters. The effects of voltage, frequency and duty cycle on the coatings were investigated by orthogonal experiment. It is found that the thickness of coatings increases with the increase of voltage and duty cycle, but decreases with the increase of frequency. The structure and morphology of the coatings also depend on voltage, frequency and duty cycle. The coatings become more porous and crack with increasing voltage and duty cycle. The coating is thin and transparent when the voltage is lower than 120 V. The corrosion resistances of different coatings were evaluated by polarization curves and electrochemical impedance spectroscopy （EIS） in 3.5% NaCl （mass fraction） solution. When the optimized values of voltage, frequency and duty cycle are 140 V, 2 000 Hz and 0.4, respectively, the anodic coating shows the best corrosion resistance.

外转子变频洗衣机驱动系统设计

采用意法半导体公司的STM32F103C8T6为主控制器、仙童公司的FSBB20CH60F为智能功率模块设计出了一套外转子变频洗衣机驱动系统。系统对无刷直流电机进行稳定控制,主要完成电机硬件驱动及变频算法的设计,较同类系统在集成度和可靠性上都大有提高。经过测试,系统在功能上满足变频洗衣机的控制要求,所有模块均工作正常,可作为变频洗衣机的主控系统应用在相关领域中。