A Ferrite Tubular Linear Motor (FTLM): Analysis and design

The electromagnetic linear machines have wide applications in the electromagnetic aircraft launch systems [1] and in transportation systems [2]. Additional energy saving and efficiency can be achieved using a linear motor in the refrigeration application [3]. Linear electromagnetic machines are also very suitable for high-speed packaging, manufacturing sectors and precision positioning. There are different linear motor topologies. Tubular permanent-magnets are particularly attractive since they have a high thrust force density and high efficiency, no end windings, and zero net attractive force between stator and armature. There are various tubular motor topologies, in which the armature may be either air-cored or iron-cored. This paper describes the analysis and design of an improved axially magnetized Ferrite Tubular Linear Motor (FTLM) in which several innovative constructive solutions have been carried out to build a, low cost, easy to assemble and robust machine. Moreover, the purpose of this article is to investigate the application of ferrite in a permanent magnetic tubular linear motor. Several results are given illustrating the system response to various inputs.