Patent ID: 9562792
Date: 2017-02-07
CPC Classifications: G01D

Claim:
1. An angle detector comprising: an intersection phase detector to compare each pair of either one of multiple sensor signals and multiple sensor processed signals obtained by processing the multiple sensor signals with signal processing and generate and output each intersection phase detection signal indicating a phase at which a signal level difference of the each pair is a first maximum hysteresis error after signal levels of signals of the each pair match as a phase of an intersection of the each pair, each of the multiple sensor signals having a signal level corresponding to a rotational position of a rotor of a motor having multiple coils, an intersection level detector to detect each intersection level being as a signal level of each intersection and generate and output multiple intersection level signals indicating the each intersection level detected, a signal selector to single out a selection signal of the either one of the multiple sensor signals or the multiple sensor processed signals; a phase detector to detect that a signal level of the selection signal selected by the signal selector has reached a threshold level corresponding to a phase of the rotor and output a phase information signal indicating the phase corresponding to the threshold level and a threshold level adjuster to adjust the threshold level based on the intersection level signal and the first maximum hysteresis error.