| 摘要 |
PROBLEM TO BE SOLVED: To output sinewave signals of different phase by 90 deg. in electrical angle by providing a plurality of magnetic field detecting means having phase difference of 90 deg. in electrical angle along the rotary focus of a rotary magnet having both magnetic poles on the positions of 180 deg. in electrical angle. SOLUTION: Hole elements 10a, 10b, 11a, 11b are arranged along the outer circumference of a rotary magnet 12 having both magnetic poles on the positions of 180 deg. in electrical angle. The hole elements 10a, 10b are arranged so as to have phase difference of 90 deg. in output voltage, and the hole elements 10a and 11a, 10b and 11b are arranged so that the output voltage of them respectively have phase difference of 180 deg.. The hole elements 10a, 11a are on the position where output voltage is zero cross at the pole changeover part of the rotary magnet 12, and the hole elements 10b, 11b are on the position where the output is sinewave reduced pressure having phase difference of 90 deg. in electrical angle against the output of the hole elements 10a, 11a. Hereby, from the output of the hole elements 10a, 11a and the output of the hole elements 10b, 11b, output A, B of the same sinewave characteristic are obtained. |
