Magnetic Permeance Phase Bias Technology and Its Application in Compressor Electromagnetic Noise Suppression
A novel method is proposed to reduce the vibration and noise in air compressors by using a magnetic permeance phase bias(MPPB).With additional phase shifts on some certain harmonics of magnetic permeance,the phases of related magnetic harmonics in stator and rotor core are also biased,thereby reducing the amplitude of the on-load magnetic density harmonics and weakening the double frequency radial force.First,the influence of MPPB on the amplitude of magnetic field harmonics is analytically derived.Then,an eccentric arc tooth structure is proposed for a 9-slot 6-pole permanent magnet synchronous motor(PMSM).By using finite element method,the influence between the phases of magnetic permeance harmonics and the magnetic density of harmonics is analyzed.The magnetic density of second harmonics under load and the radial force density of the proposed structure are compared with those of conventional structure,respectively.Finally,the reduction on vibration acceleration and noise of the MPPB structure is verified by comparing the proposed MPPB structure and conventional structure with vibration test of single motor,compressor noise and air condition system noise.
magnetic permeance phase bias(MPPB)electromagnetic noiseradial electromagnetic forcepermanent magnet synchronous motor(PMSM)
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