Design and characteristics analysis of linear oscillatory actuator with ferrite permanent magnet for refrigerator compressor

摘要

Actuators using NdFeB permanent magnets (PMs) are widely used, but they are costly and are affected by unstable material supply. In this study, a linear oscillatory actuator (LOA) using a ferrite PM is designed for use in the compressor for refrigerators, instead of the NdFeB PM. In spite of benefits of ferrite PM, it has not been widely used because the residual magnetic flux density of the ferrite PM is normally 35% less than that of a NdFeB PM. To overcome this shortcoming, we analyze the mover features of the LOA using two types of the ferrite PMs: interior PM type and Halbach PM type. The LOA designed has the same outer stator outer radius and number of coil turns as a conventional LOA with the NdFeB PM. The validity of the designed model is verified by comparing the analysis results using the nonlinear finite element method.