✦ LIBER ✦
Elimination of tonal acoustic noise in chopper-controlled DC drives
✍ Scribed by Paul G. Handley; Mark Johnson; John T. Boys
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 611 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0003-682X
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✦ Synopsis
A variable speed DC motor drive using pulse width mo&dated (PW:~I) waveforms will emit dominant tonal acoustic noise in addition to the normal motor running noise. These tonal components occur at harmonics of the P WM switching frequency and greatly increase the subjective annoyance of the resulting motor noise. A novel technique of eliminating these tonal noise components by randomly dithering the P WM switching frequency is proposed. The effect of this dithering is to replace the tonal components with broadband noise which is subjectively less annoying.