Abstract
Received:11 november 2020; Accepted: 27 December 2020; Published online: 05 April 2021
 Abstract : For low cost, spoke type ferrite magnet motors with small air gap are using to washing machine. At that time, a noise problem occurs, so a design to reduce the noise is required. In the washing machine, set noise increased due to the reduction of air gap of motor at high speed spin mode. Not only the overall noise, but also the harmonics noises are greatly increased at set. As a result of set noise test and noise analysis through finite elements method, a stator tooth shoe shape in which the magnetic flux changes rapidly is cause of noise. Its shape creates many harmonics of load torque. The harmonics component of the load torque increases the overall noise of the set. The harmonics noise of the set has a large correlation with radial force component as well as the torque ripple. Especially, it is found that the harmonics noise of the set is related to harmonics component of load torque and the harmonics component of the radial force at stator tooth. The noise is reduced by applying the new design of stator tooth shoe that can minimize the change in magnetic flux through the noise cause analysis. Through this research, the harmonics noise as well as overall noise are reduced at small airgap motor. Therefore, it is possible to develop cost reduction motor for washing machine.
Highlights
IntroductionDue to high power density and low cost, many studies have been conducted on the Spork type permanent magnet synchronous motor (SPMSM) [1-5]
Due to high power density and low cost, many studies have been conducted on the Spork type permanent magnet synchronous motor (SPMSM) [1-5].IPM motor type motors such as these SPMSM has disadvantage for noise
Noise reduction is an important issue in design of SPMSM at washing machine
Summary
Due to high power density and low cost, many studies have been conducted on the SPMSM [1-5]. Noise reduction is an important issue in design of SPMSM at washing machine. Cost savings in washing machines using SPMSM require airgap reduction and stack length reduction for same performance. In this case, noise problem is occurred. In the case of washing machine motors, there are two modes of operation: washing mode and spin(dehydration) mode, and the mode in which noise is more important is spin mode. The main noise source for spin mode is motors. We analyze the relationship between set noise and motor shoe shape. A new shape of the shoe is proposed through the analysis of the relationship with the representative noise sources, and the noise of the washing machine during spin mode is reduced through the optimal design
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