| 摘要 |
A capacitive angle encoder (50) for sensing position of a rotating shaft (150) includes a transmitter (52), including multiple segments disposed about the shaft, each segment generating a periodic electrostatic field at a common frequency, but having a different, predetermined phase from the other segments. A receiver (54) generates signals responsive to the fields from the multiple segments such that the strength of reception of each of the fields is modulated by a variation of a capacitance between the transmitter and the receiver as a function of rotation of the shaft. A detector circuit (64) processes the signals so as to generate an output indicative of the rotation angle. |
