PWM Switching Frequency Effects on Eddy Current Sensors for Magnetically Suspended Flywheel Systems | Zendy

Ralph Jansen | Zendy; Ramon C. Lebron | Zendy; A. G. Birchenough | Zendy; Timothy Dever | Zendy

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PWM Switching Frequency Effects on Eddy Current Sensors for Magnetically Suspended Flywheel Systems

Author(s) -

Ralph Jansen,

Ramon C. Lebron,

A. G. Birchenough,

Timothy Dever

Publication year - 2003

Publication title -

1st international energy conversion engineering conference (iecec)

Language(s) - English

Resource type - Conference proceedings

DOI - 10.2514/6.2003-6107

Subject(s) - flywheel , eddy current , pulse width modulation , current (fluid) , electrical engineering , physics , control theory (sociology) , computer science , engineering , automotive engineering , voltage , control (management) , artificial intelligence

A flywheel magnetic bearing (MB) pulse width modulated power amplifier (PWM) configuration is selected to minimize noise generated by the PWMs in the flywheel position sensor system. Two types of noise are addressed: beat frequency noise caused by variations in PWM switching frequencies, and demodulation noise caused by demodulation of high order harmonics of the switching voltage into the MB control band. Beat frequency noise is eliminated by synchronizing the PWM switch frequencies, and demodulation noise is minimized by selection of a switching frequency which does not have harmonics at the carrier frequency of the sensor. The recommended MB PWM system has five synchronized PWMs switching at a non-integer harmonic of the sensor carrier.

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