Title:
RELATIVE ANGLE DETECTION DEVICE, TORQUE SENSOR, ELECTRICALLY-DRIVEN POWER STEERING DEVICE AND VEHICLE
Document Type and Number:
Japanese Patent JP2017015696
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a relative angle detection device that is suitable for enlarging a torque detection range, and to provide a torque sensor, electrically-driven power steering device and vehicle that include the relative angle detection device.SOLUTION: On the basis of a first sign expressing sin(θ+Δθ) corresponding to a rotation angle θof a first multi-polar magnet 10 rotating in synchronization with an input axis 22a of the input axis 22a and an output axis 22b coaxially arranged, and a first cosine signal expressing cos(θ+Δθ), and a second sign expressing sinθcorresponding to a rotation angle θof a second multi-polar magnet 11 rotating in synchronization with the output axis 22b, and a second cosine signal expressing cosθ, sinΔθ and cosΔθ are computed that correspond to a relative angle Δθ between the input axis 22a and output axis 22b, and the relative angle Δθ is computed from Δθ=arctan(sinΔθ/cosΔθ).SELECTED DRAWING: Figure 6
Inventors:
OHIRA KAZUHIRO
KUWABARA MASAKI
SUGITA SUMIO
KUWABARA MASAKI
SUGITA SUMIO
Application Number:
JP2016113839A
Publication Date:
January 19, 2017
Filing Date:
June 07, 2016
Export Citation:
Assignee:
NSK LTD
International Classes:
G01L3/10; B62D5/04; G01B7/30; G01D5/20; G01D5/245; G01L3/12
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Attorney, Agent or Firm:
Yoshiaki Naito
Toru Miyasaka
Akira Obayashi
Toru Miyasaka
Akira Obayashi