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公开(公告)号：US20220297757A1
公开(公告)日：2022-09-22
申请号：US17634629
申请日：2021-04-07
申请人： NSK LTD.
摘要： A rotation angle detection device including: an angular position calculation unit configured to calculate angular position information representing an angular position of the motor rotation shaft based on a first sensor signal of the first sensor; an rotation number detection unit configured to detect a rotation number of the motor rotation shaft based on a second sensor signal of a second sensor and outputs rotation number information representing the rotation number; a rotation angle calculation unit configured to calculate rotation angle information indicating a rotation angle of the motor rotation shaft based on the angular position information and the rotation number information; and a power supply unit configured to stop supplying power to the first sensor, the angular position calculation unit and the rotation angle calculation unit and to supply power to the second sensor and the rotation number detection unit when the power switch is off.
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公开(公告)号：US20220089216A1
公开(公告)日：2022-03-24
申请号：US17432338
申请日：2021-04-07
申请人： NSK LTD.
摘要： The power control unit sets a drive interval for driving the sensor by providing power intermittently to the sensor to a first time interval when no change is detected in the sine-wave signal and the cosine-wave signal, sets to the second time interval that is shorter than the first time interval when a change in only one of the sine-wave signal and the cosine-wave signal is detected, and sets to the third time interval that is shorter than the second time interval when a change in one of the sine-wave signal and the cosine-wave signal is detected and then a change in the other is detected.
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