Tubular linear motor position detection by hall-effect sensors

The Permanent Magnet Tubular Linear Motor (PMTLM) system using Hall-effect sensors as the position feedback devices is discussed in this paper. In order to have high precision position detection, simulation by the Finite Element Analysis (FEA) software Flux 2D and real experimentation are conducted. By choosing suitable Hall-effect sensor mounting positions, detecting the axial and radial directions of magnetic field and using double Hall sensors, high precision results are obtained. The results show the possibility of using Hall-effect sensors for linear motor position detection especially for low-cost linear servo systems.