The temperature rise of the motor stator winding is positively correlated with the current. When the current increases, the temperature rise will naturally increase, and the increase will be greater. In addition to the influence of current, the temperature rise is also related to other related factors, such as process fluctuations and quality control during production and processing. In order to avoid non-conformities caused by factors such as process fluctuations, a certain margin should be left in product design.

The technical requirements for motor products specify the rated voltage and frequency range of the motor. When the range is exceeded, the motor will not work properly. Therefore, the grid parameters corresponding to the motor should be guaranteed to meet the normal operating conditions of the motor. The most direct effect is the voltage on the motor windings, especially for temporary lines installed outdoors. Due to cost and material safety reasons, aluminum core wires are often used for temporary lines, resulting in a serious lack of voltage actually applied to the motor. At this time, the motor current is particularly large, which will eventually cause the motor to overheat and burn out due to overheating in a relatively short period of time.