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    • 9. 发明公开
    • ANGLE DETECTING DEVICE
    • EP4357736A1
    • 2024-04-24
    • EP22824880.3
    • 2022-06-08
    • NTN Corporation
    • KOIKE, TakashiFUKUSHIMA, Yasuyuki
    • G01D5/245B25J19/02G01D5/244
    • B25J19/02G01D5/245G01D5/244
    • An angle detecting device (4) includes: an encoder unit (6) having a magnetic track on which N poles and S poles are alternately arrayed; and a magnetic sensor (7) facing the magnetic track with a gap interposed therebetween. The magnetic track has, when being expressed with a reference magnetic pole width (P) and a reference magnetic pole pair number (n), a main track (2) having a magnetic pole width of (P) and a sub track (3) having a magnetic pole width of (Pn/(n-1)), the main track (2) and the sub track (3) being provided adjacent and parallel to each other along a longitudinal direction of a sheet-shaped encoder magnetic material (1). The encoder unit (6) is formed of the sheet-shaped encoder magnetic material (1) which has a length not larger than a reference length (L=2Pn) and which is wound around and fixed to an outer circumference portion or an inner circumference portion of a rotary body (5). The angle detecting device (4) further includes a correction calculator (10) configured to multiply an absolute angle calculated by a calculator (9) of the magnetic sensor (7) by a correction coefficient based on a diameter of the encoder unit (6), to correct the absolute angle of the rotary body.
    • 10. 发明公开
    • ANGLE DETECTION METHOD AND ANGLE DETECTION DEVICE
    • EP4350299A1
    • 2024-04-10
    • EP22815620.4
    • 2022-03-10
    • Nidec Corporation
    • ISHIGAMI ShotaKITANOYA Toru
    • G01D5/244
    • One aspect of an angle detection device of the present invention includes: three magnetic sensors that detect a change in magnetic flux due to rotation of a rotation shaft; and a signal processing unit that processes signals output from the three magnetic sensors. The signal processing unit acquires sensor signals output from three sensor signals, extracts an intersection point at which two sensor signals among the three sensor signals intersect with each other and a zero-cross point at which each of the three sensor signals intersect with a reference signal level, generates a linear function θ(Δx) representing a straight line connecting the intersection point adjacent to each other and the zero-cross point, calculates a deviation between a mechanical angle θ calculated based on the linear function θ(Δx) for a plurality of points on the straight line and a mechanical angle θe acquired from an encoder installed on a rotation shaft as a first angle error, and generates a first angle error function for calculating a first angle error corresponding to an arbitrary point on the straight line based on the first angle error calculated for the plurality of points on the straight line.