The noise from variable frequency power supplies originates from three sources: the core, the winding, and the cooler. This encompasses the sum of noise caused by no-load, load, and cooling systems. The core generates noise due to the magnetostrictive effect under the alternating magnetic field of the core silicon steel sheets, resulting in minor changes and periodic vibration with the excitation frequency. The magnetostrictive deformation of the core and electromagnetic forces within the winding, oil tank, and magnetic shielding contribute to this. The winding produces vibration because of the electromagnetic force generated in the current-carrying winding, and the leakage magnetic field can also cause vibration in the structural components. Electromagnetic noise is caused by the longitudinal vibration of the core lamination induced by the magnetic field, with the vibration amplitude being related to the magnetic flux density in the core lamination and the magnetic properties of the core material, rather than the load current. The electromagnetic force (and vibration amplitude) is proportional to the square of the current, while the emitted sound power is proportional to the square of the vibration amplitude. Aviation ground power: 2, 36V aviation power supply, 1, 400HZ variable frequency power supply: 7, 115/200V power supply: 2, 27V DC power supply: 5, 400HZ power supply: 12, aviation power supply
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