Motor overheating is one of the common faults in chain hoists, usually caused by overload operation, poor heat dissipation, or mechanical resistance.

1. Prolonged high-load operation (exceeding the duty cycle)
Explanation: Motors are designed with a specific duty cycle, such as 40% or 15% for some models. This means that under rated load, the motor can only operate continuously for 40 minutes before needing to stop and cool down. If the operator uses it continuously beyond this time limit, the temperature of the motor windings will continuously rise, eventually leading to overheating alarms or burnout.
Solution: Strictly follow the duty cycle requirements in the instruction manual and avoid continuously lifting heavy objects for extended periods; perform intermittent operation when necessary.
2. Overload or frequent lifting (excessive mechanical resistance)
Explanation: The motor itself is the driving device. Overload operation leads to a sharp increase in current and increased motor heating. If the weight being lifted is close to or exceeds the rated load, the motor must output greater torque to overcome the load, which increases internal friction and raises the temperature.
Solution: Before use, ensure that the lifting load is well below the rated load. Even short-term overloads can cause irreversible damage to the motor's lifespan.
3. Poor heat dissipation conditions (environmental factors)
Explanation: The motor relies on the heat sink fins on its casing for heat dissipation. If the motor is exposed to high temperatures, humidity, or dusty environments for a long time, the heat sink fins will be covered, leading to reduced heat dissipation efficiency. In addition, if the motor is placed in a poorly ventilated space, the heat cannot dissipate quickly, which is also a common cause of overheating.
Solution: Ensure that the motor operates in a well-ventilated environment and regularly clean the dust from the heat sink fins.