JAJSHC9B May 2019 – October 2021 ALM2402F-Q1
As mentioned in Section 126.96.36.199.2, the excitation signal is similar to a sampling pulse in ADCs, with the real information being in the envelope created by the rotor. Equation 3, Equation 4, and Equation 5 show the behavior of the sin and cos outputs. The excitation signal is attenuated and enveloped by the voltage created from the electromagnetic response of the rotating rotor. The resolver analog-output-to-digital converter filters out the excitation signal, and processes the sine and cosine angles produced by the rotor. Hence, signal integrity or the sine and cosine envelope is most important in resolver design; although, some trade-offs in signal integrity of the excitation signal can be made for cost or convenience. Often, a square wave or sawtooth signal is used to accomplish excitation, as opposed to a sine wave.