Audible noise in speed-controlled inverter-fed medium-sized induction motors
✍ Scribed by J. Muster; P. K. Budig; R. Belmans; W. Geysen; Ph. K. Sattler
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 797 KB
- Volume
- 5
- Category
- Article
- ISSN
- 1430-144X
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✦ Synopsis
The audible noise produced by three-phase, squirrel-cage induction motors, is caused by the space harmonics of theflux-density distribution in the air gap of the machine. When the motor is supplied by a frequency inverter in order to control the speed, time harmonics in both current and voltage are present, yielding new components in the audible noise spectrum. In the paper, a number of motor-inverter combinations are compared for medium-sized induction motors (90 kW). As a reference case, the motors are supplied with a generator, delivering a variable frequency without harmonics. Theoretical explanations for the increase of the audible noise level and the additional frequency components are given.