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Patent Agency Ranking
公开(公告)号：US12214829B2
公开(公告)日：2025-02-04
申请号：US18721458
申请日：2022-12-08
Applicant: NSK LTD.
Inventor： Takayuki Kobayashi , Kyosho Uryu
Abstract: A current detection device includes a current detection unit configured to detect current flowing through a switching element of a lower-side arm; a correction value calculation unit configured to calculate an offset correction value, based on a detection value of the current detected by the current detection unit in a period during which the switching element off during PWM control, and to hold and update the calculated offset correction value; and a correction unit configured to correct, by the offset correction value held by the correction value calculation unit, the detection value of the current detected by the current detection unit in a period during which the switching element is on. The correction value calculation unit is configured to not update the offset correction value in a case where a duty ratio of the PWM control is equal to or less than a duty ratio lower limit value.
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公开(公告)号：US11597436B2
公开(公告)日：2023-03-07
申请号：US17432321
申请日：2021-04-07
Applicant: NSK LTD.
Inventor： Dai Suzuki , Takayuki Kobayashi , Shin Kumagai , Hidetaka Nakamura
IPC: B62D15/02 , G06F1/3287 , B62D5/04 , B62D6/00 , G01B7/30 , G01D5/16 , G01L3/10 , G01L5/22 , G01D5/244
Abstract: The power management unit supplies first power that is continuous power to the second sensor when the power switch is on, supplies second power that is intermittent power having a voltage lower than the first power to the second sensor when the power switch is off, and outputs rotation number information representing a rotation number of the motor rotation shaft based on the second sensor signal. The power management unit includes a comparator that operates using the second power as the power source when the power switch is off and compare the second sensor signal and the reference voltage, and a counter that detects the rotation number of the motor rotation shaft by counting the output of the comparators.
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公开(公告)号：US12296885B2
公开(公告)日：2025-05-13
申请号：US17634629
申请日：2021-04-07
Applicant: NSK LTD.
Inventor： Takayuki Kobayashi , Dai Suzuki , Shin Kumagai , Hidetaka Nakamura
Abstract: 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; a 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 output 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：US11511803B2
公开(公告)日：2022-11-29
申请号：US17432338
申请日：2021-04-07
Applicant: NSK LTD.
Inventor： Takayuki Kobayashi , Dai Suzuki , Shin Kumagai , Hidetaka Nakamura
IPC: B62D15/02 , G06F1/3287 , B62D5/04 , B62D6/00 , G01D5/244
Abstract: 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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公开(公告)号：US11453439B2
公开(公告)日：2022-09-27
申请号：US17432338
申请日：2021-04-07
Applicant: NSK LTD.
Inventor： Takayuki Kobayashi , Dai Suzuki , Shin Kumagai , Hidetaka Nakamura
IPC: B62D15/02 , G06F1/3287 , B62D5/04 , B62D6/00 , G01D5/244
Abstract: 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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