Rotation position detector

Abstract

Abstract PURPOSE:To obtain a rectangular wave output free of the influence of an interference wave through small-sized, simple constitution, by detecting pieces of angle information on a rotor which are different in intervals by a specific angle alternately and outputting an alternating current which is inverted alternately, and converting the output into a rectangular wave. CONSTITUTION:Magnets 12-15 are fitted to a rotor 11 and when the rotor rotates as shown by an arrow, a magnetic field is applied to a Hall element 18 in the order of N and S poles while the magnets 12 and 13, and 14 and 15 are coupled respectively. Consequently, the element 18 outputs the AC output which is inverted in variation direction at intervals of 180 deg.. This output is amplified by an amplifier 52 and compared by a comparator 54 with a threshold level 42 generated by resistances 55 and 56 and a hysteresis circuit 53 to obtain the rectangular wave output. Then the signal which is inverted alternately at 0 and 180 deg. against the rotation of the rotor 11 is obtained from the rising and falling of the output.

Inventors

• 👤 Miyao Arakawa
• 👤 荒川　宮男
• 👤 Shinko Sato
• 👤 真弘 佐藤
• 👤 Akihiko Takenaka
• 👤 昭彦 竹中
• 👤 Toshiyuki Yamaguchi
• 👤 敏行 山口

Bibliographic Details