Rotation angle detection device and rotation angle detection method

US10852163B2 · kind B2 · utility

Assignee

• Mitsubishi Electric Corporation · JP

Inventors

• Hitoshi Isoda · Chiyoda, JP
• Yoshihiro Miyama · Tokyo, JP
• Tatsuo Nishimura · Tokyo, JP
• Hideaki Arita · Chiyoda, JP
• Shinji Nishimura · Tokyo, JP
• Koji Nishizawa · Tokyo, JP

Key dates

• Filing date: Oct 31, 2016
• Grant date: Dec 1, 2020
• Expiry date: Oct 31, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D2205/77
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A rotation angle detection device including: a rotor; a stator including “b” (b≥3) magnetic detection portions (MDPs) each including a bias magnetic field generation portion and a magnetic detection element (MDE); and a rotation angle processor calculating a rotation angle of the rotor based on a detection by the (MDEs). The rotor has convex and concave portions (CCPs), which change in “x” cycles for a mechanical angle 360 (“x”≥1) to make the MDEs possible to obtain a sine wave. There are arranged “b” MDPs along a circumferential direction of the stator for each cycle of the CCPs, which are arranged at intervals of a mechanical angle 360×(n×b+m)/(x×b), where “n” (n≥0) represents, by a number of cycles, a deviation amount of each of the MDPs from a reference position in the circumferential direction, and “m” (1≤m≤“b”) represents a position of a MDP in an arrangement order.