Abstract
This article presents linear oscillating actuator (LOA) which generates bidirectional linear thrust force. Design topology of the proposed LOA contains an outer mover and an inner stator design. Two axially magnetized and tubular-shaped permanent magnets (PMs) are mounted on the mover. Due to the higher magnetic flux density of axially magnetized PMs in a specific direction, it generates higher thrust force than radially magnetized PMs. The proposed LOA operates on single-phase alternating source. All the design specifications of the LOA are optimized through finite element method (FEM) and optimum values of the design parameters are obtained. Output parameters such as the stroke length and thrust force are analyzed for multiple magnitudes of the input parameters such as current using FEM. Additionally, Other parameters like back emf, coil current and winding resistance are analyzed at resonance. Effect of motor constant is investigated toward both directions of the force, which show identical replication. Output parameters of the LOA are compared with already designed topologies of the LOA for refrigeration system. Proposed LOA demonstrates promising improvements in terms of motor constant and thrust force compared to the volume of the LOA. Moreover, proposed LOA is comparatively convenient to fabricate as well.
Highlights
linear oscillating actuator (LOA) provides controlled linear oscillatory motion (LOM) between two extreme positions
This paper proposes a novel topology of an outer mover moving magnet LOA using tubular shaped and axially magnetized permanent magnets (PMs). 2-D axisymmetric structure and CAD model are used for better understanding of the structure and working principle of the LOA
An outer mover moving magnet topology of LOA for compressor in refrigeration system is proposed in this paper
Summary
LOA provides controlled linear oscillatory motion (LOM) between two extreme positions. Static part of the LOA yield controlled electromagnetic field and mover adjust its position to provide least reluctance path to magnetic flux. STRUCTURE AND OPERATING PRINCIPLES A 2-D axisymmetric structure of proposed outer mover inner stator LOA is shown in the (Figure 1) As shown, this topology is composed of two major parts: static and moving. Left stator pole (leg) becomes south pole and attracts north pole of the PM At this position of the mover, mover provides least reluctance route to magnetic flux lines. When the winding is energized by single phase AC for half cycle of an AC, magnetic field is produced in one direction At this instant, mover experiences thrust force in one direction. Date linked to multiple values of the parameter are analyzed by using parametric sweep option which provides output on each value for the parameter like stroke
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