磁悬浮热解石墨片的光驱转动提供了一种光能向动能转换的途径,对该现象的研究在能量转换领域中具有重要意义。使用等效磁荷法计算永磁体磁场的空间分布,接着对热解石墨片的受力、扭矩及势能分布进行了理论计算。基于此,对圆形热解石墨片在嵌套的圆柱形永磁体上的光驱转动现象进行计算分析和解释。研究发现,当嵌套的圆柱形永磁体严格同轴时,圆形热解石墨片在激光照射下不会发生光驱转动现象。但嵌套的永磁体在装配时不可避免地会产生一定的偏心量,导致磁场分布不对称,使得圆形热解石墨片的扭矩随着激光照射点呈周期性变化,因此产生了光驱转动现象。

The optical drive rotation of the magnetically levitating pyrolytic graphite sheet provides a way to convert solar energy into kinetic energy, and the study on this phenomenon is of great significance in the field of energy conversion. The equivalent magnetic charge method is used to calculate the spatial distribution of the magnetic field of the permanent magnet. The force, torque, and potential energy of the pyrolytic graphite sheet are calculated. Based on this, the optical drive rotation phenomenon of the circular pyrolytic graphite on the nested cylindrical permanent magnet is calculated, analyzed, and explained. It is found that when the nested cylindrical permanent magnet is strictly coaxial, the circular pyrolytic graphite sheet will not rotate under laser irradiation. However, the nested permanent magnet will inevitably produce a certain amount of eccentricity during assembly, resulting in asymmetric magnetic field distribution, which makes the torque of the circular pyrolytic graphite sheet change periodically with the laser irradiation point, so the optical drive rotation phenomenon occurs.