Patent ID: 7895010
Filing Date: 2011-02-22
Classification: G01D,G01P

Abstract:
1. An angle detection device of a resolver comprising: an angle detector detecting an angle signal of the resolver from among signals detected from the resolver; a velocity detector detecting a rotational velocity signal of the resolver from the angle signal detected at the angle detector; an angle error estimator calculating a detection error for each frequency component by frequency analysis of the rotational velocity signal with reference to the detected angle signal and combining the calculated detection errors to generate an estimated angle error signal; and an angle signal correction circuit correcting a detected angle signal by using the generated estimated angle error signal; wherein the angle error estimator comprises: a high pass filter portion passing high frequency components of the rotational velocity signal, an m-part angle velocity data preparation portion dividing the high frequency components of the rotational velocity signal passed through the high pass filter portion to a plurality of regions with reference to the detected angle signal, a Fourier transform portion applying a Fourier transform to the m-part angle velocity data generated at the m-part angle velocity data preparation portion, an n-th order coefficient accumulation portion accumulating Fourier transform coefficients of the n-th order components for results of the Fourier transform at the Fourier transform portion to calculate n-th order coefficient accumulation value signals, and an m-part error angle data preparation portion combining the n-th order coefficient accumulation value signals calculated at the n-th order coefficient accumulation portion to prepare the estimated angle error signal.