H - Electricity – 02 – K
Patent
H - Electricity
02
K
H02K 5/24 (2006.01) H02M 7/5395 (2006.01)
Patent
CA 2149112
With this method for the low-noise operation of a machine driven by a pulse inverter, the amplitudes and frequencies of the harmonics of the inverter output voltages let themselves be computed. 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 of the modulation index (a0) and the fundamental oscillation frequency (f1), the fanning-out and the elimination has no influence on the fundamental oscillation (uGS) or the operating point of the machine. The control of the inverter takes place through sinusoidal pulse width modulation (PWM) and sinusoidal modulation (PFM) of the triangular carrier signal (uH). 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). Apart from a more uniform distribution, also a reduction in the amplitudes of the harmonics (Unmv) arises through this fanning-out. The noise arising in that case on the one hand displays a reduced level and, on the other hand, the sound pattern no longer has any conspicuous individual frequencies and is perceived as noise.
Eilinger Thomas
Stemmler Herbert
Ag Inventio
Riches Mckenzie & Herbert Llp
LandOfFree
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