一种低频旋转磁场仪的设计

Design of low-frequency spinner magnetometer

目的：为了更方便、可靠地研究旋转磁场的生物效应,设计一种低频旋转磁场仪。方法：利用单片机控制步进电动机,带动永磁铁产生旋转磁场,实现步进电动机驱动模块、键盘控制模块、显示模块和串口通信模块以及测速模块等的软硬件设计。结果：该低频旋转磁场仪达到了转速频率范围为1-10 Hz、转速精度为±5%的设计要求,可精确定位刺激部位,用于小面积照射。结论：该低频旋转磁场仪工作稳定可靠、频率精度高、操作简便,可广泛用于低频旋转磁场生物效应的研究和实验。

Objective To design a low-frequency spinner magnetometer to explore the bio effect of rotating magnetic field.Methods SCM was used to control stepping motor, and then permanent magnet was driven to generate rotating magnetic field. The design was completed for the hardware and software of driver module for stepping motor, keyboard control module, display module, serial communication module and speed measuring module. Results The magnetometer met the desired requirements for rotating frequency from 1 to 10 Hz and precision of ±5%, which could locate the stimulation position accurately for small-area irradiation. Conclusion The magnetometer has high reliability, high frequency accuracy and easy operation, and thus can be used for the study and experiment on the bio effect of low-frequency rotating magnetic field.