Device for capacitive determination of motor shaft rotation angle and revolution rate has oscillation circuit with capacitor with electrodes rotatable relative to each other and microcontroller

摘要

The device has an electrical oscillation circuit with an Ohmic resistance and a capacitor arrangement whose fundamental frequency is determined by the resistance and capacitance. First and second capacitor arrangement electrodes are rotatable relative to each other when the shaft rotates so their overlap region varies between maximum and minimum values and the oscillation circuit frequency depends on the relative rotation. The device has an electrical oscillation circuit consisting of an Ohmic resistance and a capacitor arrangement. A fundamental frequency of the electrical oscillation circuit is defined by the resistance and the capacitance. First and second electrodes (5,6) of the capacitor arrangement are rotatable relative to each other when the motor shaft (1) rotates so their overlap regions varies between maximum and minimum values and the frequency of the oscillation circuit depends on the relative rotation. A microcontroler detects and evaluates the frequency change depending on the rotation. AN Independent claim is also included for the following: (a) a motor with a device for capacitively determining rotation angle.