温升是电机产品非常重要的性能指标，而决定电机温升水平的则是电机各部位的温度，以及所处的环境条件。

从测量的角度分析，定子部分的温度测量相对直接，而转子部分则倾向于间接测量。但无论如何检测，两者温度的相对定性关系不会有太大改变。

从电机工作的原理分析，电机的发热点基本为3个，即定子绕组、转子导体和轴承系统，如果是绕线式转子，还有集电环或碳刷部分。

从热量传递的层面分析，各个发热点温度的高低不同，必然会通过热量的传导和辐射，终达成各个部位相对意义上的温度平衡，即每个零部件都表现为温度的相对恒定。

对于电机的定子和转子部分，定子的热量可以通过壳体直接向外散发，如果转子温度相对较低，也能有效吸收定子部分的热量。因而，定子部分与转子部分的温度高低，可能需要从两者自身热量的大小进行综合评价。

当电机定子部分发热严重，而转子本体发热较少时（如，永磁电机），定子热量一方面是向周围环境散发，也有一部分是向内腔内的其他零部件传递，大概率情况下，转子的温度不会高于定子部分；而当电机转子部分发热严重时，从两个零部件的物理分布分析，转子发出的热都必须源源不断地通过定子及其他零部件散发，再加上定子本体也是一个发热体，且作为转子热量的主要散热链件，定子部分接收热量的同时通过机壳也在散热，转子温度高于定子温度的倾向性更大一些。

还有一种极限情况，当定子和转子都发热严重时，定子或转子都可能无法耐受高温的侵蚀，从而出现绕组绝缘老化或转子导体变形或液化的恶劣后果，如果是铸铝转子，特别是铸铝工艺不佳的情况，会出现转子局部发蓝或整体发蓝甚至流铝的不良表象。

Temperature rise is a very important performance indicator for motor products, and the temperature of each part of the motor and the environmental conditions it is located in determine the level of temperature rise.
From a measurement perspective, the temperature measurement of the stator part is relatively direct, while the rotor part tends to be measured indirectly. However, regardless of the detection, the relative qualitative relationship between the two temperatures will not change much.
From the analysis of the working principle of the motor, there are basically three hotspots of the motor, namely the stator winding, rotor conductor, and bearing system. If it is a wound rotor, there is also a collector ring or carbon brush part.
From the perspective of heat transfer, the temperature of each heat source varies, and it is inevitable that through the conduction and radiation of heat, the relative temperature balance of each part will be achieved, that is, each component will exhibit a relatively constant temperature.
For the stator and rotor parts of the motor, the heat from the stator can be directly dissipated outward through the casing. If the rotor temperature is relatively low, it can also effectively absorb the heat from the stator part. Therefore, the temperature of the stator and rotor parts may need to be comprehensively evaluated based on the magnitude of their own heat.
When the stator part of the motor heats severely while the rotor body heats less (such as permanent magnet motors), the stator heat is not only dissipated to the surrounding environment, but also transferred to other components in the inner cavity. It is highly likely that the temperature of the rotor will not be higher than that of the stator part; When the rotor part of the motor generates severe heat, based on the physical distribution analysis of the two components, the heat emitted by the rotor must be continuously dissipated through the stator and other components. In addition, the stator body is also a heating element, and as the main heat dissipation chain component of the rotor, the stator part receives heat while also dissipating it through the casing. The tendency for the rotor temperature to be higher than the stator temperature is greater.
There is also a limit situation where when both the stator and rotor generate severe heat, both may not be able to withstand the erosion of high temperatures, resulting in adverse consequences such as insulation aging of the winding or deformation or liquefaction of the rotor conductor. If the casting aluminum rotor is used, especially in cases of poor casting aluminum technology, there may be localized or overall blueing of the rotor, or even aluminum flow.