Torque ripple and noise reduction by avoiding mechanical resonance for a brushless DC machine
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United States of America Patent
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Feb 22, 2005
Grant Date -
Jan 27, 2005
app pub date -
Jul 24, 2003
filing date -
Jul 24, 2003
priority date (Note) -
Expired
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Abstract
A method of reducing torque ripple and noise for an brushless DC machine comprising: determining a control frequency for the electric machine, the control frequency indicative of an existing current command to and a rotational velocity of the electric machine; multiplying the control frequency by a selected multiple and forming a modulating signal responsive thereto; and formulating a modified command profile. The method also includes: correlating and synchronizing the modified command profile with the existing current command and a rotor position for the electric machine; and generating a modulated current command to the electric machine.
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