Wang Tianyi, Yan Liang, Jiao Zongxia
School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China.
Rev Sci Instrum. 2015 Jul;86(7):075001. doi: 10.1063/1.4923330.
Linear oscillating actuator provides linear reciprocate motion directly without other auxiliary components, which is suitable for high integration applications in aerospace industry. Accurate position control is essential for linear oscillating motor and relies on concise measurement of mover position. However, most position measurements are dependent on external complicated sensors, which hinders further integration of linear oscillating actuation system. In this paper, a novel position sensing system for linear oscillating actuator based on Hall effects is proposed to achieve accurate and high integration measurement simultaneously. Axial sensing magnetic field with approximately linear relationship with position is created for direct and convenient measurement. Analytical model of sensing magnetic field is set up for optimization and validated by finite element method and experimental results. Finally, sensing magnets are integrated into motor prototype for experiments. Dynamic position results are tested in experiments and prove to be effective and accurate for position sensing with short-stroke.
直线振荡执行器无需其他辅助部件即可直接提供直线往复运动，适用于航空航天工业中的高集成应用。精确的位置控制对于直线振荡电机至关重要，并且依赖于动子位置的精确测量。然而，大多数位置测量都依赖于外部复杂的传感器，这阻碍了直线振荡驱动系统的进一步集成。本文提出了一种基于霍尔效应的新型直线振荡执行器位置传感系统，以同时实现精确和高集成度测量。创建了与位置具有近似线性关系的轴向传感磁场，以便进行直接和便捷的测量。建立了传感磁场的解析模型进行优化，并通过有限元方法和实验结果进行了验证。最后，将传感磁体集成到电机原型中进行实验。实验测试了动态位置结果，证明其对于短行程位置传感是有效且准确的。
