Method of control of magnetic sound of alternating current...

Details Method of control of magnetic sound of alternating current... Method of control of magnetic sound of alternating current...

2007-01-30

2007-01-30

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

Anti-hunting

C318S629000

Reexamination Certificate

active

11100557

ABSTRACT:
A method for greatly reducing magnetic sound of an alternating current rotating machine compared with the past comprising superimposing an n−1-th order frequency in inverse turn on a multi-phase alternating current with reference to a basic frequency component of the multi-phase alternating current supplied to an armature of the alternating current rotating machine of multiple phases so as to reduce the n-th order harmonic components of the basic frequency component among radial direction magnetic vibrating forces generated in the radial direction in a core of the alternating current rotating machine.

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B.P. Lathi, “Signal Processing & Linear Systems”, Berleley Cambridge Press, 1998. Chapters 3 and 4 describe Fourier Series and Fourier Transform for converting a time domain spectrum into a frequency domain spectrum.

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