Torque ripple and noise reduction by avoiding mechanical resonance for a brushless DC machine
AssigneeGeneral Electric Company
InventorsAjit Kane, Amit Sanglikar
Life of this patent
Estimating the term…
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.
Claims19
A method of reducing torque ripple and noise for an brushless DC machine comprising:
- determining a control frequency for said electric machine, said control frequency indicative of an existing current command to and a rotational velocity of said electric machine;
- multiplying said control frequency by a selected multiple and forming a modulating signal responsive thereto;
- formulating a modified command profile;
- correlating and synchronizing said modified command profile with said existing current command and a rotor position for said electric machine;
- and
- generating a modulated current command to said electric machine.
A system for reducing torque ripple and noise for an electric machine comprising:
- an electric machine in operable communication with an inverter;
- a position sensor in operable communication with said electric machine, said position sensor configured to detect a position of said electric machine and transmit a signal indicative thereof;
- a current sensor configured to measure a current supplied to said electric machine and transmit a signal indicative thereof;
- a controller in operable communication with said inverter, said position sensor, and said current sensor, said controller configured to execute a method comprising:
- determining a control frequency for said electric machine, said control frequency indicative of an existing current command to, and a rotational velocity of, said electric machine;
- multiplying said control frequency by a selected multiple and forming a modulating signal responsive thereto;
- formulating a modified command profile;
- correlating and synchronizing said modified command profile with said existing current command and a rotor position for said electric machine;
- and
- generating a modulated current command to said electric machine.
A system for reducing torque ripple and noise for an electric machine comprising:
- a means for determining a control frequency for said electric machine, said control frequency indicative of an existing current command to and a rotational velocity of said electric machine;
- a means for multiplying said control frequency by a selected multiple and forming a modulating signal responsive thereto;
- a means for formulating a modified command profile;
- a means for correlating and synchronizing said modified command profile with said existing current command and a rotor position for said electric machine;
- and
- a means for generating a modulated current command to said electric machine.
Dependencies are inferred from the claim text.