Closed feedback control to DC motor was made by PID based on SPMC75F2413A SMC and coder in order to make the hook-liked scanning probe driven by the DC motor to rest on the specified position.
用凌阳SPMC75F2413A单片机配合编码器对直流电机进行闭环反馈控制，使直流电机带动的钩状扫描针停在规定的位置上。
SMC can reduce more loss in the High-frequency area but it cannot make up the disadvantage of bad permeability.
而且在中高频应用领域只是能够降低更多的损耗，但其导磁性能差的缺点还是没能弥补；
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