Title :
Noncontact magnetic torque sensor
Author :
Miyashita, Kunio ; Takahashi, Tadashi ; Kawamata, Shoichi ; Morinaga, Satoshi ; Hoshi, Yoshikzu
Author_Institution :
Hitachi Ltd., Ibaraki, Japan
fDate :
9/1/1990 12:00:00 AM
Abstract :
A novel noncontact magnetic torque sensor was developed which is expected to be widely used in factory automation equipment and automobiles. The sensor has two components: two magnetic drums with a torsion bar which makes the connection between the drive shaft and the load shaft, and a magnetic sensor. In order to obtain sinusoidal outputs, the magnetic sensor has multiple magnetoresistive elements with different phase angles to one other. The angles of the magnetic drums can be calculated by using sinusoidal outputs on a microcomputer. Torque can be calculated from the torsion bar angle difference. A trial torque sensor with a maximum detection torque of 200 kg-cm was manufactured. Its resolution was ±0.7% and it could be used at 120°C
Keywords :
electric sensing devices; magnetostrictive devices; torquemeters; 120 degC; angle difference; drive shaft; load shaft; magnetic drums; magnetic sensor; maximum detection torque; multiple magnetoresistive elements; novel noncontact magnetic torque sensor; phase angles; sinusoidal outputs; torsion bar; Automobiles; Gears; Magnetic sensors; Magnetoresistance; Manufacturing automation; Microcomputers; Motor drives; Sensor phenomena and characterization; Shafts; Torque;
Journal_Title :
Magnetics, IEEE Transactions on
