Low-noise operation of a machine fed by a pulse inverter

Details Low-noise operation of a machine fed by a pulse inverter Low-noise operation of a machine fed by a pulse inverter

1995-05-24

1997-04-29

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

318811, 388811, 363 98, 363132, H02M 112

Patent

active

056255420

ABSTRACT:
A method and apparatus for the low noise operation of a electrical machine driven by a pulse inverter computes the amplitudes and frequencies of the harmonics of the inverter output voltages. Through targeted setting of the modulation parameters, the frequency spectrum or the noise spectrum can be fanned out and harmonics, which would excite stator resonances, can be eliminated. Due to the independence of the modulation parameters from the modulation index (a.sub.0) and the fundamental oscillation frequency (f.sub.1), the fanning-out and the elimination has no influence on the fundamental oscillation (u.sub.GS) or on the operating point of the machine. The inverter is controlled through sinusoidal pulse width modulation (PWM) and sinusoidal pulse frequency modulation (PFM) of a triangular carrier signal (U.sub.H). By this method, the main groups of the harmonics with two ordinate numbers (n, v) are fanned out into subgroups with three ordinate numbers (n, m, v). In addition to a more uniform distribution, there also is a reduction in the amplitudes of the harmonics (U.sub.nmv) through this fanning-out method. The generated noise is reduced in level and the sound pattern does not contain any conspicuous unpleasant individual frequencies.

REFERENCES:
patent: 4691269 (1987-09-01), Yamane et al.
patent: 5068777 (1991-11-01), Ito
Blaabjerg et al., Improved Modulation Techniques for PWM-VSI Drives, pp. 1187-1192, Nov. 15-1993, Maui, Hawaii, IEEE vol. 2, Power Electronics.

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