Host: The Japan Society of Mechanical Engineers
Name : The 15th International Conference on Motion and Vibration(MoViC 2020)
Date : September 09, 2020 - September 11, 2020
The system to assist the driver of a car has been developed by progress of control technology. Since the vehicle weight increases due to the installation of the assist device, it is necessary to improve the power of the engine to exhibit the same acceleration performance as before. Therefore, focused on an electromagnetic drive valve system (EDVS) that drives a valve train using a linear motor as a new VVT. This has been established as a method for fundamentally solving the abnormal motion that occurs in systems when using conventional valve springs. We propose a system that uses this EDVS to improve the output by freely changing the valve lift and opening/closing timing for each engine speed. In this study, EDVS is using a linear motor with PM as a stator and a coil as a mover. We conducted electromagnetic field analysis by the finite element method and investigated changes in thrust characteristics when the magnetizing direction of the permanent magnet (PM) of the actuator was changed. In this analysis, the direction of the current flowing in the coil was fixed in order to study the effect of the magnetization direction of PM on the thrust. As a result of the analysis, it was confirmed that the vertical magnetization model tends to have higher thrust when the upper and lower magnets are magnetized in opposite directions. This is because in the vertical magnetization model, by turning the upper and lower magnets in opposite directions, the lower magnet generated a magnetic force that repelled the coil, and the upper magnet generated a magnetic force that attracted the coil. The thrust of the actuator could be improved by changing the magnetization direction of the permanent magnet.
