输送机用隔爆水冷异步电机的损耗计算

Loss calculation of water-cooled explosive-proof asynchronous motor used in conveyor

输送机用隔爆异步电机在运行的过程中,经常处于空载、轻载和过载运行状态,导致电机的定转子电流和损耗不断发生变化,对电机的温升和可靠运行带来影响。以YBSD-525/263-4/8G电机为例,建立电机的二维有限元模型,对3种不同运行状态下电机损耗进行了分析。通过对电机铜耗分析可知,随着负载的增加,基波电流和谐波电流也逐渐增大,定转子的铜耗也增大。在对电机的铁耗进行分析时,考虑磁密分布不均的影响,将电机的定转子铁芯分成7个部分分别对磁密和铁损进行计算和分析。由分析结果可知:当电机负载增加时,定转子齿顶和齿身的铁损增加最快,齿根和齿轭的铁损变化不大。本研究为今后对隔爆水冷异步电机负载状态改变时内部温度场的分析奠定基础。

The flame-proof asynchronous motor used in conveyor often works in the state of no-load, light load and overload. It causes the changes of current and the loss of stator and rotor, which will influence the temperature rise and the reliable operation of the motor. In this paper, taking YBSD-525/263-4/8G motor as an example, the two-dimensional finite element model was established. The motor loss was analyzed in three running state. Through the analysis of copper loss, it showed that the current of the stator and rotor increased with the load increase. The harmonic current also increased. It leaded the increase of copper loss. When the iron loss was analyzed, the iron core was divided into seven parts in order to reduce the impact of flux density distribution. The analysis result showed that the iron losses in the tooth top and tooth body increased fast and the change of the iron loss in the tooth root and tooth yoke was not big with load increase. This study provided a foundation for analyzing the temperature field of the motor with load states change. © 2016, Editorial Office of Journal of China Coal Society. All right reserved.