通过对便携式磁粉机磁化电流的研究，发现在方波磁化电流模型下，磁轭线圈容易在电流换向时出现尖峰电流。提出了一种基于梯形波的优化磁化电流模型，使磁轭线圈电流平缓换向，解决了尖峰电流带来的高能耗和潜在的对电路损害的问题。试验结果表明，优化的磁化电流模型能减少电池输出电流的31.96%，使磁粉机的续航时间提升46.98%，具有一定的参考价值。

By the research of square wave magnetizing current model of portable magnetic powder machine, it is found that the yoke coil will cause the peak current when the current of coil is reversing. In this paper, a magnetization current model based on trapezoidal wave is proposed. It makes the coil current of the magnetic yoke reverse smoothly and reduces the peak current to avoid the peak current damage to the drive circuit. The experimental results show that the optimization model can reduce the average current of the battery by 31.96% and improve the life time of the magnetic powder machine by 46.98%. It has certain reference significance.