Recently, as ambient temperatures have risen, willow catkins have arrived as expected, flying freely in the air and posing safety hazards to power plant equipment, especially motors. They can also clog air ducts and fan guards. When motors are running normally, their temperature will be higher than the surrounding ambient temperature because motors generate heat during operation.
The temperature of an electric motor has a significant impact on the lifespan and performance of its insulation materials. Different insulation materials have different heat resistance ratings, which determine the maximum temperature at which the motor can operate safely.
The insulation classes of electric motors, from lowest to highest, are Y, A, E, B, F, H, and C, with corresponding allowable operating temperatures of 90℃, 105℃, 120℃, 130℃, 155℃, 180℃, and above 180℃, respectively. For example, a motor with Class B insulation has an allowable operating temperature of 130℃. This means that if the motor's operating temperature exceeds this value, the insulation material may age faster due to high temperatures, or even be damaged, potentially leading to motor burnout.
In addition, the temperature rise of a motor refers to the difference between the temperature of the stator windings and the ambient temperature when the motor is operating at its rated temperature. The ambient temperature is typically set below 35°C or 40°C. If the motor's temperature rise exceeds a certain range, such as exceeding the ambient temperature by more than 25°C, this usually indicates that the motor's temperature rise is outside the normal range and requires inspection and handling.
The causes of motor overheating may include overload, voltage imbalance, contact problems, incorrect winding wiring, and insulation damage. When the motor temperature exceeds the allowable temperature of its insulation material, the performance of the insulation material will decrease, its lifespan will be shortened, and it may even burn out.
Therefore, to ensure the normal operation of the motor and extend its service life, the motor temperature needs to be checked regularly, and measures should be taken to ensure it operates within a safe temperature range. If an abnormally high motor temperature is detected, operation should be stopped immediately and the motor inspected to prevent it from burning out.
