Considerations on Design for a Cylindrical Moving Magnet Type Linear Oscillatory Actuator having Spring Characteristics

Abstract

In recent years, linear oscillatory actuators (LOAs) employing mechanical resonance have been researched aiming at highly efficient actuators. This paper considers a cylindrical moving magnet type LOA having spring characteristics for resonant oscillation in the actuator itself An equation to express the thrust of the proposed LOA is derived using a permeance model, and calculation results by the permeance analysis and magnetic field analysis are compared with actual measured results. The thrust constants by the permeance analysis and magnetic field analysis agree with the measurement, and the permeance analysis with a short calculation time is effective in calculation of the thrust constant. The magnetic field analysis is effective in the calculation of the spring characteristics of static thrusts. In addition, the optimization of the size of the proposed LOA based on the motor constant is investigated A relational equation of the size of the LOA and the motor constant is derived. From calculation results on the motor constant using the permeance analysis and magnetic field analysis, the effectiveness of the permeance analysis with a short calculation time is confirmed. Moreover, by focusing on the motor constant below the same thrust constant, it is found that the coil resistance is effective as optimization indices identical to the motor constant.