Title :
A dynamic method for magnetic torque measurement using pendulum motion system
Author :
Lin, Chin E. ; Jou, H.L. ; Yan, J.H.
Author_Institution :
Inst. of Aeronaut. & Astronaut., Nat. Cheng Kung Univ., Tainan, Taiwan
Abstract :
The purpose of this paper is to verify the electromagnetic formula of the magnetic torque acting on permanent magnet. The proposed method uses a pendulum motion system to obtain the real measurement and compared to the theoretical calculations. From the angular position measurements of pendulum motion, the magnetic torque in the locus is obtained. The problem of difference amplification of noise in high sampling rate is overcome by B-spline curve fitting method. The errors of the measuring results and theoretical calculation are significant mainly due to the magnetic field being induced by the permanent magnet near the iron core of electromagnet. In the paper, the problem to cause errors is analyzed and discussed, and modification to the existing formula, is made. The improvement of calculation result is discussed
Keywords :
angular measurement; curve fitting; magnetic levitation; magnetic variables measurement; measurement errors; pendulums; permanent magnets; position measurement; torque measurement; B-spline curve fitting; angular position measurement; difference amplification of noise; dynamic method; electromagnetic formula; errors; magnetic torque; magnetic torque measurement; pendulum motion system; permanent magnet; real measurement; sampling rate; Curve fitting; Electromagnetic measurements; Magnetic field measurement; Magnetic noise; Motion measurement; Permanent magnets; Position measurement; Sampling methods; Spline; Torque measurement;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1994. IMTC/94. Conference Proceedings. 10th Anniversary. Advanced Technologies in I & M., 1994 IEEE
Conference_Location :
Hamamatsu
Print_ISBN :
0-7803-1880-3
DOI :
10.1109/IMTC.1994.352045
