Motor operating region based random pulse width modulation
AssigneeFord Global Technologies, LLC
InventorsXuemei Sun, Jami J. Miller, Christopher Wolf, Liqun Na
Life of this patent
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Abstract
A vehicle includes a traction motor having resonance frequency zones, an inverter including switches arranged to drive the traction motor, and a controller. The controller operates the switches only within specified sets of carrier frequencies such that noise side bands corresponding to the carrier frequencies fall outside the resonance frequency zones.
Claims18
A vehicle comprising:
- a traction motor having resonance frequency zones;
- an inverter including switches arranged to drive the traction motor;
- and
- a controller configured to operate the switches only within specified sets of carrier frequencies such that noise side bands corresponding to the carrier frequencies fall outside the resonance frequency zones and at least one of the carrier frequencies falls within one of the resonance frequency zones.
A vehicle control system comprising:
- a controller configured to operate switches of an inverter arranged to drive a traction motor only within specified sets of carrier frequencies that depend on a speed of the traction motor such that noise side bands corresponding to the carrier frequencies fall outside resonance frequency zones of the traction motor and at least one of the carrier frequencies falls within one of the resonance frequency zones.
The vehicle control system of 8, wherein frequencies of the noise side bands are defined by a modulated signal fundamental frequency.
A method for operating a traction motor, having resonance frequency zones, comprising:
- by a controller, operating switches of an inverter arranged to drive the traction motor only within specified sets of carrier frequencies that depend on speed of the traction motor such that noise side bands corresponding to the carrier frequencies fall outside the resonance frequency zones and at least one of the carrier frequencies falls within one of the resonance frequency zones.
Dependencies are inferred from the claim text.