Motor protection forms directly influences the structure and the ventilation and heat dissipation of the motor, when the design must be sufficient attention. General dc motor protection forms are protected and enclosed two kinds. Protection type is mainly refers to the insulation of the conductive part of its necessary or mechanical shell protection, such as power to prevent accidental contact and short circuit accident, but not significantly hinder the ventilation and heat dissipation of the motor. Enclosed motor structure can prevent the free exchange of the casing inside and outside air, but does not require a completely closed, it is mainly used for dust more places. for more details, please log on to http://www. hengdrive。 Com 2012 - motor controller co. , LTD9 -14 the Chinese first-class enterprise brushless dc motor controller, creating common, standard the full range of brushless dc motor controller the motor controller. All rights reserved, reprint without permission.