To provide a rotation angle detector, a motor controller, an electric power steering device, and a rotation angle detection method with which it is possible to maintain high detection accuracy.SOLUTION: The gain of a first sine wave signal is corrected to obtain a second sine wave signal on the basis of the maximum or minimum value of the first sine wave signal when the revolution speed of a motor is less than or equal to an upper-limit threshold. The gain of a first cosine wave signal is corrected to obtain a second cosine wave signal on the basis of the maximum or minimum value of the first cosine wave signal when the revolution speed of a motor is less than or equal to an upper-limit threshold. The gain of a third sine wave signal derived by adding the second cosine wave signal and the second sine wave signal is corrected to obtain a fourth sine wave signal on the basis of the maximum or minimum value of the third sine wave signal. The gain of a third cosine wave signal derived by subtracting the second sine wave signal from the second cosine wave signal is corrected to obtain a fourth cosine wave signal on the basis of the maximum or minimum value of the third cosine wave signal. The rotation angle of the motor is calculated on the basis of the fourth sine wave signal and the fourth cosine wave signal.SELECTED DRAWING: Figure 7
【課題】高い検出精度を維持することができる回転角検出装置、モータ制御装置、電動パワーステアリング装置、及び回転角検出方法を提供すること。【解決手段】モータの回転数が上限閾値以下であるときの第1正弦波信号の最大値又は最小値に基づき、第1正弦波信号のゲインを補正して第2正弦波信号とする。モータの回転数が上限閾値以下であるときの第1余弦波信号の最大値又は最小値に基づき、第1余弦波信号のゲインを補正して第2余弦波信号とする。第2余弦波信号と第2正弦波信号とを加算した第3正弦波信号の最大値又は最小値に基づき、第3正弦波信号のゲインを補正して第4正弦波信号とする。第2余弦波信号から第2正弦波信号を減算した第3余弦波信号の最大値又は最小値に基づき、第3余弦波信号のゲインを補正して第4余弦波信号とする。第4正弦波信号及び第4余弦波信号に基づき、モータの回転角を算出する。【選択図】図7
ROTATION ANGLE DETECTOR, MOTOR CONTROLLER, ELECTRIC POWER STEERING DEVICE, AND ROTATION ANGLE DETECTION METHOD
回転角検出装置、モータ制御装置、電動パワーステアリング装置、及び回転角検出方法
2019-08-29
Patent
Elektronische Ressource
Japanisch
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