Drive device of electric motor
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United States of America Patent
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Oct 25, 2011
Grant Date -
Mar 25, 2010
app pub date -
Mar 14, 2008
filing date -
Mar 15, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric motor has a field pole formed by a field current passing through a field winding. A voltage booting converter converts output voltage of a battery and outputs the voltage between a power source line and a grounding line. Field winding is electrically connected onto an electric current channel between battery and power source line and formed so that voltage switched by a switching element is applied to both ends. A controller controls the field current so as to adjust density of magnetic flux between a rotor and a stator by performing switching control on switching element and a switching element connected in parallel to field winding and converts the output voltage of battery into voltage in accordance with a voltage command value.
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