Patent
Method and apparatus for determining angular velocity
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TLDR
In this article, an approach for determining angular velocity using a resolver and multiplying its stator (orthogonal vector component) signals by signals representing the functions -sin Qt and +cos Qt, combining the products arithmetically, and demodulating the sum signal.Abstract:
Apparatus is disclosed for determining angular velocity using a resolver and multiplying its stator (orthogonal vector component) signals by signals representing the functions -sin Qt and +cos Qt, combining the products arithmetically, and demodulating the sum signal. The demodulator output is proportional to the magnitude of angular velocity. For a velocity signal with proper sign, the stators are driven by the signals representing the functions -sin Qt and +cos Qt to obtain a signal across a high impedance (constant current) source which, upon compensation for phase shifts introduced by the resolver, is used as a reference in determining the proper sign for a velocity signal. When the stator signals are replaced by orthogonal vector component signals of any vector, rectangular to polar coordinate conversion is achieved. A DC signal proportional to the vector angle is obtained by a circuit which detects the phase difference between the sum signal and the signal representing the function cos Qt.read more
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