ROTATION SENSOR

• Main Authors: MAKITA MASAHIRO, OMI TETSUYA
• Format: Patent
• Language: English; Japanese
• Published: 27.09.2018
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; TARIFF METERING APPARATUS; TESTING

PROBLEM TO BE SOLVED: To provide a rotation sensor with which it is possible to detect the electrical angle of a rotor with high accuracy, and which can be installed even when it is difficult to secure a space in the axial direction of the rotor.SOLUTION: A plurality of magnetic sensors 40 are arranged at equal interval in the circumferential direction of a shaft 100 apart from the outer circumference of the shaft 100 and have their positions fixed, the magnetic sensors 40 detecting a change of a magnetic field due to the change of the rotational position of the shaft 100 by revolution of the shaft 100. Thus, each magnetic sensor 40 outputs a sinusoidal signal and a cosine wave signal that correspond to the electrical angle of revolution of the shaft 100. An arithmetic unit 50 accepts as input the sinusoidal signal and cosine wave signal from each magnetic sensor 40, adds or subtracts each signal in accordance with a predetermined rule, and thereby acquires an electrical angle signal in which high-order components included in each signal are canceled out. Thus, an electrical angle signal with little distortion, i.e., a high-accuracy electrical angle is obtained.SELECTED DRAWING: Figure 1 【課題】回転体の電気角を高精度に検出することができ、さらに、回転体の軸方向にスペースを確保することが困難な場合でも設置可能な回転センサを提供する。【解決手段】複数の磁気センサ４０は、シャフト１００の外周から離れてシャフト１００の周方向に等間隔で配置されていると共に位置が固定され、シャフト１００の回転によってシャフト１００の回転位置が変化することに伴う磁界の変化を検出する。これにより、各磁気センサ４０は、シャフト１００の回転の電気角に応じた正弦波信号及び余弦波信号を出力する。また、演算部５０は、各磁気センサ４０から正弦波信号及び余弦波信号を入力し、予め決められた規則に従って各信号を加減算することにより、各信号に含まれる高次成分を相殺した電気角信号を取得する。これにより、歪みが小さい電気角信号すなわち高精度な電気角が得られる。【選択図】図１