Declined angle analysis of shaft using magnetic field measurement

Abstract

This paper presents the method to develop sensor for measuring shaft rotation and angular decline based on trigonometric and Pythagoras method. Magnetic flux density on the direction of constant magnetic field was measured using Helmholtz Coil as a magnetic field generator and using Hall Generator No. A1302 as a sensor. The resolution of shaft rotation was 1 degree per step and the range of shaft decline was varied from 4 to 10 degree away from the origin which was normal to ground level. Angle declining from the origin which is normal to magnetic field can be determined by measuring the relationships between Hall voltage and magnetic filed. If the shaft which was fixed on Hall Generator was rotated and not perpendicular to magnetic field, the Hall voltage was varied and the results was then transferred to computer to evaluate the angular decline of shaft. It can be indicated that the voltage varies sinusoidally while increasing the decline angle. Despite low costs of system, the method presented in this study was developed with consideration of effectiveness and reliability. Moreover, the method can be applied in machine alignment as well as in detection of building structure declination. © 2009 SICE.