How is transformer noise caused?
Release time：2021-03-26 16:20:44 Popularity： Source：未知
Specifically, there are three sources of transformer noise, one is the core, two is winding, three is the cooler, that is, no-load, load and cooling system resulting in the sum of the noise. The noise of the iron core is caused by the small change of magnetoelasticity, which makes the iron core oscillate periodically with the change of excitation frequency, magnetoelastic deformation of iron core and electromagnetic force in winding, oil tank and magnetic shield. The reason for the Oscillation of the winding is the electromagnetic force in the current winding, and the leakage magnetic field can also make the structure Oscillate. The electromagnetic noise is caused by the Longitudinal Oscillation of the core laminates induced by the magnetic field. The amplitude of the Oscillation is related to the magnetic flux density in the core laminates and the magnetic properties of the core materials, but not to the load current. The electromagnetic force (and the amplitude of the Oscillation) is proportional to the square of the current, while the acoustic power of the emission is proportional to the square of the amplitude of the oscillation.
Service