Title :
Novel methods of temperature compensation for permanent magnet sensors and actuators
Author :
Rajagopal, K.R. ; Singh, Bhim ; Singh, B.P. ; Vedachalam, N.
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Technol., New Delhi, India
fDate :
7/1/2001 12:00:00 AM
Abstract :
In this paper, the adverse effects of variation in operating temperature on the performance of PM sensors and actuators used in aerospace and military applications, and methods to provide inherent temperature compensation by design, are presented. Unlike the conventional shunt compensation, the proposed method uses the direct leakage path between two neighboring permanent magnets. This novel method arrived at after conducting finite element (FE) analysis, is capable of giving complete temperature compensation over the entire operating temperature range. In a gyroscope designed and developed under this scheme, the temperature sensitivity of the torquer scale factor of the gyroscope in an operating temperature range of -60 to +80°C is measured to be less than -10 ppm/°C against the normal value of -450 ppm/°C, observed in a gyroscope having no inherent temperature compensation
Keywords :
compensation; electromagnetic actuators; finite element analysis; gyroscopes; magnetic sensors; permanent magnets; -60 to 80 degC; aerospace applications; direct leakage path; finite element analysis; gyroscope; military applications; neighboring permanent magnets; operating temperature; permanent magnet actuators; permanent magnet sensors; temperature compensation; temperature sensitivity; torquer scale factor; Actuators; Aerospace industry; Aerospace materials; Gyroscopes; Magnetic sensors; Permanent magnets; Space technology; Temperature distribution; Temperature sensors; Torque measurement;
Journal_Title :
Magnetics, IEEE Transactions on
