Origin offset calculation method of rotational position detecting device of electric motor and motor control device using the calculation method
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United States of America Patent
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Apr 4, 2006
Grant Date -
Jan 19, 2006
app pub date -
Jul 11, 2005
filing date -
Jul 15, 2004
priority date (Note) -
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Abstract
An inverter that executes a d q-axis control of a three-phase synchronous motor needs a rotational position sensor that detects rotational positions of an electric motor for mutual conversion between two-phase and three-phase. An angle error of this rotational position sensor affects accuracy in the d q-axis control, so that it is necessary to make a compensation with accuracy. In the conventional method, however, there is a problem of occurrence of an ignorable error due to influence of noise. An origin offset calculation method according to the invention includes a first process of forcibly making d q-axis current command values zero; a second process of multiplying a magnetic flux component voltage command value at this time by a proportional integral gain; and a third process of storing a rotational position sensor phase error when a magnetic flux component voltage command value becomes zero being a result of the second process.
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