Design and Analysis of a Novel Dual Stator Tubular Moving Magnet Linear Actuator for Compressor Application

This article presents a novel design topology of a dual stator linear oscillating actuator (DSLOA) which provides bi directional electromagnetic (EM) force. The investigated topology of LOA is composed of dual stator and single moving magnet tubular shaped mover. All the design parameters of the proposed DSLOA are optimized by using parametric sweep and selected optimum value of the parameters. Radius of both stators are optimized in regard of mover mass which play significant role in term of operating resonance frequency, during design of LOA. Oscillating behavior of the proposed DSLOA is analyzed and verified through DC and AC loading. Output response like EM force and amplitude of oscillation (stroke) are investigated using multiple values of input current and at different positions of the mover. Proposed design is compared with already designed topologies of the LOA in regards of motor constant, volume, EM force per permanent magnet (PM) mass and amplitude of the oscillation (stroke). PM is the most expensive part of the moving magnet LOA and proposed LOA provides 332.17 N EM force per kg of PM mass which is significantly higher compared to the state of the art designs of LOA. Motor constant of investigated topology of LOA is 120 N/A which shows significant advancement in term of motor constant while having design simplicity. Moreover, proposed DSLOA operates with 12 mm range of stroke which is feasible for compressor in refrigeration system. Furthermore, mechanical topology of the investigated DSLOA is simple, easy to manufacture and low cost.