Patent ID: 6525502
Filing Date: 2003-02-25
Classification: H03M

Abstract:
A system for determining the angular position of the shaft of a motor, comprising in combination:a resolver coupled to said shaft, said resolver including a sine winding, a cosine winding, and an excitation winding; a processor including an analog-to-digital convertor input stage that demodulates signals from the sine winding and the cosine winding; a driver for supplying an excitation signal to said excitation winding; wherein said sine winding and said cosine winding are each electrically connected to transmit signals to said input stage of said processor, said input stage sampling signals from said sine winding and said cosine winding synchronously with the peaks of said excitation signal so that respective sample values represent sine and cosine envelope values; wherein said processor is operable to convert signals from said sine winding and said cosine winding to digital values and wherein said processor is operable to calculate said angular position from said digital values; and wherein said processor is operable for generating a quadrature encoded pulse stream indicating the magnitude and direction of a change in said angular position.