Abstract: Since the energy loss of a motor not only reduces its efficiency, but also leads to temperature rise in the motor, as represented by the difference between the motor temperature and the ambient temperature. The temperature rise will accelerate the aging and damage of the motor insulation component and reduce the life of the motor. Therefore, the prediction of the motor temperature rise is very important. In this paper, a temperature rise model for DC permanent magnet motors is proposed, where an exponential relation is assumed between the temperature rise and the time. The motor temperature rise curve is obtained by fitting the relation with the measured data, and compared with the measured temperature rise curve in the carbon brush of the motor, which verifies the accuracy of the fitting temperature rise curve. This model can be applied to monitor the motor real-time temperature rise. As the window lift motor works as a repeated short-term motor, this paper studies the short-term working system with the motor heating and cooling model.
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Received: 23 September 2009
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