ANGLE SENSOR, ANGLE/TORQUE SENSOR, AND ELECTRIC POWER STEERING UNIT USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a sensor for power steering for detecting precisely a steering angle with a simple constitution having excellent consistency with an inductance type torque sensor. SOLUTION: An angle detecting part 54 having a Hall element, that is one of a magnetic sensitive element, is inserted between an input shaft detecting ring 26 and a compensation ring 34 rotated integrally with an input shaft 12 for the steering. A magnetic flux generated in a compensation coil 36 passes through the input shaft detecting ring 26, the compensation ring 34 and a magnetic path 38. Unevenness of the magnetic flux is generated locally in a space between the compensation ring 34 and the input shaft detecting ring 26, caused by a tip part 7a and a bottom part 34b of the compensation ring 34. The angle detecting part 54 detects a condition change of the magnetic flux by rotation of the compensation ring 34. The angle sensor to detect a rotation angle of the input shaft 12 can be obtained by this manner. COPYRIGHT: (C)2005,JPO&NCIPI