| 摘要 |
The invention relates to a method and device for determining the torque applied upon the rotary body that can be driven about an axis of rotation, comprising a first and a second sensor, which are respectively arranged with a fastening element at the rotary body at an axial distance from each other, and which comprise rings surrounding the rotary body comprising fields showing alternating different signal behaviors, with one transmitter being allocated jointly to the first sensor and the second sensor, which jointly accept from the two sensors an output signal, from which a square-wave signal is formed, from which in a first step from the flank distances of certain inclining and/or declining flanks of the square-wave signal constant values T are formed, which are dependent on the geometry of the rings of the two sensors, and variable values a which are dependent on the torque applied. |
| 主权项 |
1. A method for determining the torque applied upon a rotary body that can be driven about an axis of rotation, comprising a first and a second sensor, each of which respectively arranged with a fastening element at the rotary body at an axial distance from each other and comprising rings surrounding the rotary body showing alternating different signal behaviors, wherein one transmitter is allocated jointly to the first sensor and the second sensor, which accepts jointly an output signal from both sensors, from which a square-wave signal is formed, from which in a first step from the flank distances of certain inclining and/or declining flanks of the square-wave signal constant values Ti are determined, which are dependent on the geometry of the rings of the two sensors, and variable values αi, which are dependent on the torque applied, wherein, in an open arrangement of the two rings of the two sensors in reference to each other the constant values Ti, Ti′ are defined as the distance of one flank from the second-to-next flank aligned in the same direction or as the distance of two neighboring opposite flanks, particularly the distance between an inclining flank and a subsequent declining flank and the variable values αi, αi′ as the distance of two neighboring opposite flanks, which are embodied opposite in reference to the flanks used to determine the constant values, particularly the distance between a declining flank and a subsequent inclining flank, or as the distance of two neighboring flanks aligned in the same direction, and that in an open arrangement of the two rings of the two sensors in reference to each other over one or more complete rotation(s) of the unstressed, torqueless rotary body the constant values Tmli, i=1 . . . n and the variable values αmli, i=1 . . . n, allocated to the first sensor are each added and the constant values Tmli′, i=1 . . . n, and the variable values αmli′, i=1 . . . n, allocated to the second sensor, are each added and momentless ratios
γml=(αml1+αml2+ . . . +αmln)/(Tml1+Tml2+ . . . +Tmln)=Σi=1nαmli/Σi=1nTmli and
γ′ml=(α′ml1+α′ml2+ . . . +α′mln)/(T′ml1+T′ml2+ . . . +T′mln)=Σi=1nα′mli/Σi=1nT′mli are formed, with the γml-values and γ′ml-values meeting the following condition:
γml<γml, with over one or more complete rotations of the rotary body stressed with the torque to be determined the constant values Tmi, i=1 . . . n, allocated to the first sensor, and the variable values ami, i=1 . . . n, are each added and the constant values Tmi′, i=1 . . . n, allocated to the second sensor, and the variable values αmi′, i=1 . . . n are each added and the moment-impinged ratios
γm=(αm1+αm2+ . . . +αmn)/(Tm1+Tm2+ . . . +Tmn)=Σi=1nαmi/Σi=1nTmi and
γ′m=(α′m1+α′m2+ . . . +α′mn)/(T′m1+T′m2+ . . . +T′mn)=Σi=1nα′mi/Σi=1nT′mi are formed, with the γm-values and γ′m-values values meeting the following condition:
γm<γ′m with the work at the rotary body impinged with a moment being determined from the equations
w=∫02πMdφ= M2π≈(γm−γml)k, and
w′=∫02πM′□□□dφ= M′2π≈|(γ′m−γ′ml)|k, with k representing a calibration constant and φ the angle of rotation of the rotary body and with the entire torque being determined by M+ M′, with
M=w/2π≈|(γm−γml)|k/2πand
M′=w′/2π≈|(γ′m−γ′ml)|k/2π. |
