Controller for determining abnormality of a pulse outputter
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United States of America Patent
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Aug 28, 2018
Grant Date -
Sep 14, 2017
app pub date -
Mar 9, 2017
filing date -
Mar 11, 2016
priority date (Note) -
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Abstract
A controller has an encoder that outputs four-phase pulse signals according to a rotation of a rotor of a motor by a rule. During a rotational drive of the motor, when (i) an abnormal pulse state is observed in which the pulse signal is output in a non-compliant manner with the rule and (ii) a lapse time from a last normal output timing, which is a last timing of an output of the pulse signal by the rule, is longer than a threshold determination time, it is conclusively determined that the encoder has abnormality. Thus, the encoder is provided with an improved noise-proof character, and is prevented from being falsely determined as abnormal due to the abnormal pulse state, even when an output of the pulse signal from the encoder is temporarily ridden by a noise.
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