Observation and comparison reveal differences in data or products.
For example, in the case of high-voltage and low-voltage motors, there are differences in power range and size.
Another important aspect is the clear distinction in the wiring systems of high-voltage and low-voltage motors.
This is due to the special characteristics of the electrical clearance and creepage distance in high-voltage motors, which require much larger wiring boxes compared to low-voltage motors.
Coincidentally, careful observation reveals that fans with a higher number of poles and lower speeds are larger and have a relatively higher number of blades compared to fans with fewer poles and higher speeds.
This is directly related to the heat exchange required during the motor's operation and the motor's rotational speed.
In order to ensure a proper temperature rise during the motor's operation, it is necessary to increase the airflow of the fan when the motor's speed is relatively low; otherwise, it may result in an imbalance between heat generation and dissipation.
Considering the correlation between motor mechanical losses and efficiency, an increase in fan mechanical losses will lead to a decrease in the overall efficiency of the motor.
We have come into contact with a large number of 12-pole 500 kW low-voltage motors.
These motors come with built-in fans in their structural design. However, during actual operation, the motors tend to experience high temperature rise, even though the fans matched with the motors have reached their limits.
In order to solve this problem, the manufacturing factory adopted an additional heat dissipation device to cool the motors.
However, due to the interference between the external heat dissipation device and the original motor ventilation structure, the results were not satisfactory.
After reorganizing and discussing the issue (originally thought to be caused by purchased iron core materials not meeting requirements), the original fans of the motors were directly removed, and cooling was achieved solely through a relatively independent ventilation device. The improvement effect was particularly good.
The fact proves that for particularly low-speed motors, the cooling fan coaxial with the motor may not meet its actual cooling requirements, and it needs to be solved through an independent ventilation structure that is not limited by the motor speed.
From a theoretical analysis, a variable frequency motor must be equipped with independent ventilation and cooling components in order to solve the cooling problem during low-speed operation of the motor.
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