Patent ID: 8170811
Filing Date: 2012-05-01
Classification: B60L,B62M,G01L,Y10T

Abstract:
1. A drive device, comprising: a drive shaft mounted so as to rotate about an axis; two driving cranks connected to the drive shaft in a circumferential direction with respect to the axis in an angularly rigid manner; and an output element, which is connected to the drive shaft, transmitting torque between the drive shaft and a load element, wherein at least one magnetostrictive sensor is permanently connected to the drive shaft and is arranged axially between a driving crank and the output element, wherein at least one axial section of the drive shaft is formed as part of the magnetostrictive sensor by magnetization, wherein the at least one axial section of the drive shaft comprises a first region, near to a surface, with a first magnetization and a second region, remote from the surface, with a second magnetization, and wherein the first magnetization and the second magnetization are added in a mechanically unloaded torque-free state of the drive shaft to form an essentially vanishing magnetic field outside the drive shaft.