Chao-chun Hsu, Chih-chieh Chen, Sheng-Hsiu Huang, Chih-wei Lin
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引用次数: 0
Abstract
A motor plays a crucial role in household appliances, such as fans, hair driers, cleaning robots and electric shavers. However, varies studies have showed that the motors inside the household appliances, such as vacuum cleaners and toy cars, generate the ultrafine particle, which have been proven to be harmful to human health. So, we will test the particle number concentration and particle size, and know about the main mechanisms by which motors generate particles. Ultimately, find an effective way to control motor-generated particles We establish an experimental chamber with a volume of 2 liters. Test motor would be placed inside the chamber, and the chamber were supplied with particle free air to bring out the particles. We use a Condensation Particle Counter and a Scanning Mobility Particle Sizer to monitor the particulate concentration and particle size range over time. A brushed DC motor and a brushless DC motor with a rated output power of 64 W commonly used indoors, will be utilized for testing. The results of mechanism experience indicate that both the brushes and the bearings generate particles through mechanical friction, and the particles generated through spark discharge are 100 times more numerous than those generated through mechanical friction. This suggests that spark discharge is the main mechanism for particle generation by the motor. At a rotational speed of approximately 10,000 RPM, the particle emission rate reaches as high as 3.4 x 107 #/sec.However, at 10,000 RPM, the particle emission rate of the brushless DC motor is only 2.2 x104 #/sec, about one-thousandth that of the brushed DC motor.
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About the Journal
Annals of Work Exposures and Health is dedicated to presenting advances in exposure science supporting the recognition, quantification, and control of exposures at work, and epidemiological studies on their effects on human health and well-being. A key question we apply to submission is, "Is this paper going to help readers better understand, quantify, and control conditions at work that adversely or positively affect health and well-being?"
We are interested in high quality scientific research addressing:
the quantification of work exposures, including chemical, biological, physical, biomechanical, and psychosocial, and the elements of work organization giving rise to such exposures;
the relationship between these exposures and the acute and chronic health consequences for those exposed and their families and communities;
populations at special risk of work-related exposures including women, under-represented minorities, immigrants, and other vulnerable groups such as temporary, contingent and informal sector workers;
the effectiveness of interventions addressing exposure and risk including production technologies, work process engineering, and personal protective systems;
policies and management approaches to reduce risk and improve health and well-being among workers, their families or communities;
methodologies and mechanisms that underlie the quantification and/or control of exposure and risk.
There is heavy pressure on space in the journal, and the above interests mean that we do not usually publish papers that simply report local conditions without generalizable results. We are also unlikely to publish reports on human health and well-being without information on the work exposure characteristics giving rise to the effects. We particularly welcome contributions from scientists based in, or addressing conditions in, developing economies that fall within the above scope.
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