Patent ID: 8656791
Filing Date: 2014-02-25
Classification: B62D,G01L

Abstract:
1. A torque detection apparatus comprising: a resolver unit which includes a first resolver having a first excitation coil supplied with an excitation AC signal and adapted to output detection signals corresponding to a first rotational angle of a shaft at a first axial position thereof, and a second resolver having a second excitation coil supplied with an excitation AC signal and adapted to output detection signals corresponding to a second rotational angle of the shaft at a second axial position thereof; and a torque computation section connected to the resolver unit via a wire harness, the torque computation section supplying the excitation AC signals to the first excitation coil and the second excitation coil, receiving respective detection signals output from the first resolver and the second resolver, calculating the first rotational angle of the shaft at the first axial position and the second rotational angle of the shaft at the second axial position, and calculating a torque acting on the shaft around an axis thereof on the basis of the calculated first and second rotational angles, the torque detection apparatus being characterized in that the torque computation section supplies the corresponding excitation AC signal to the first excitation coil via a first excitation line, and supplies the corresponding excitation AC signal to the second excitation coil via a second excitation line different from the first excitation line; and the resolver unit includes an electric resistance element which electrically connects the first excitation line and the second excitation line together.