This paper presents an improvement in the thermal performance of universal motor, which improves the efficiency and increases the life of the motor. Excessive heating in the winding can lead to an insulation failure of a universal motor and reduce the life of a food mixer. Hence, to avoid hot spots in machine parts and obtain a homogenous temperature distribution, it is necessary to take the thermal limits into consideration. To monitor temperature increase, a lumped parameter thermal model is designed with 12 nodes for a food mixer driven by a universal motor. This paper proposes a reduced-order thermal model for a universal motor used in food mixers to monitor its thermal behavior. In this paper, a 12th-order model is reduced to a 5th-order model using a balanced truncation reduction method. The reduced-order model is validated through simulation and experimental results by comparing its response with a full-order model. A thermal analysis is carried out using AC and DC supplies along with experimentation. It can be seen that when the universal motor is operated with a DC supply, its thermal performance is improved, which increases the life of the machine. This results in energy savings, since the efficiency of the universal motor is increased when it is operated using the DC supply.

本文介绍了通用电机热性能的改进，提高了电机的效率和寿命。绕组中的过热会导致通用电机的绝缘故障并缩短食品搅拌机的使用寿命。因此，为了避免机器零件中的热点并获得均匀的温度分布，有必要考虑热限制。为了监测温度升高，设计了一个具有 12 个节点的集总参数热模型，用于由通用电机驱动的食品搅拌机。本文提出了一种用于食品搅拌机的通用电机的降阶热模型，以监测其热行为。在本文中，使用平衡截断减少方法将12阶模型简化为5阶模型。通过将其响应与全阶模型进行比较，通过仿真和实验结果验证了降阶模型。使用交流和直流电源以及实验进行热分析。可见，万能电机在直流电源下运行时，其热性能得到改善，从而增加了机器的使用寿命。这样可以节省能源，因为通用电机在使用直流电源运行时效率会提高。