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Zanieczyszczenie środowiska - drgania i hałas silników indukcyjnych

Ogonowska-Schweitzer E.

Nowa Elektrotechnika

2007

nr 11 (39)

4--6

Hałas magnetyczny - przyczyny występowania, możliwości zmniejszania

Płoszyńska J.

Maszyny Elektryczne : zeszyty problemowe

2004

Nr 69

123-126

The total noise emitted from squirrel-cage motors has three basic types of origin sources: electromagnetical, mechanical and aerodymical. The issues connected with electromagnetic noise were submitted to the detailed analyze. Electromagnetic noise in induction motors is caused by their construction and principle of operation. This fact causes that accurate recognition of reason and placement of source of the noise, makes possible the limitation of intensity of occurrence. The main reasons of occurrence of noise of electromagnetic origin are the radial forces acting on the surface of cores of stator and rotor in the vicinity of the air gap. They are the result of the electromagnetic field occurring in the air gap. This electromagnetic field changes along the magnetic circuit as a function of time. The analyze of distribution of magnetic induction in the air gap along the inhomogeneous magnetic circuit in case of slots of stator closed with magnetic and non-magnetic material, has shown the results of usage of magnetic materials and level of the generated noise.