Servomotor with Motor Position Sensor
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2010 BMW X3, 2009 BMW X3, 2008 BMW X3, 2007 BMW X3, and 2006 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
The servomotor with worm gear are powered to rotate the disc cam. The servomotor is a permanent magnet (1) DC motor which contains a Hall sensor (2) to detect the position and the adjusting speed of the motor shaft. This is proportional to the degree of multi-disc clutch engagement. See Fig 1 .