ROTARY ELECTRIC MACHINE

PROBLEM TO BE SOLVED: To improve detection accuracy in a configuration for detecting a rotating position of a rotor by detecting a leakage magnetic flux from a rotor magnet.SOLUTION: In a brushless motor 1, a Hall device 21 detects a leakage magnetic flux from a rotor magnet 4 and outputs a signal c...

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Bibliographic Details
Main Authors NAKAMACHI KOJI, DOSHITA YOSHIAKI
Format Patent
LanguageEnglish
Japanese
Published 08.12.2014
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Summary:PROBLEM TO BE SOLVED: To improve detection accuracy in a configuration for detecting a rotating position of a rotor by detecting a leakage magnetic flux from a rotor magnet.SOLUTION: In a brushless motor 1, a Hall device 21 detects a leakage magnetic flux from a rotor magnet 4 and outputs a signal corresponding to a strength of the leakage magnetic flux and on the basis of the output signal, a rotating position of the rotor 2 is detected by a rotating position detection circuit. In a rotational axis direction of the rotor 2, a sensor pin 24 extending toward the Hall device 21 is disposed between the rotor magnet 4 and the Hall device 21, and a metal body which is disposed at a position different from the sensor pin 24 in the rotational axis direction, is disposed at a position adjacent with the Hall device 21. 【課題】ロータマグネットからの漏れ磁束を検出してロータの回転位置を検出する構成において、その検出精度を向上させる。【解決手段】ホール素子21がロータマグネット4からの漏れ磁束を検出して漏れ磁束の強さに応じた信号を出力し、その出力信号に基づいてロータ2の回転位置を回転位置検出回路にて検出するブラシレスモータ1において、ロータ2の回転軸方向においてロータマグネット4とホール素子21との間に、ホール素子21に向けて延出したセンサピン24が配置され、回転軸方向においてセンサピン24とは異なる位置に配置された金属体がホール素子21と隣り合う位置に配置されている。【選択図】図5
Bibliography:Application Number: JP20130107940