How to ensure proper heat dissipation of variable-frequency motors at low speeds (without a separate fan)
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In variable-frequency motors, the fan speed used for cooling at low speeds (when there is no separate fan) also decreases. How can proper cooling be ensured at low speeds when there is no separate fan?
I have measured it here; under normal circumstances, even at low load levels, the temperature does rise, but it remains within the specified range! If, under long-term low-load conditions, the motor temperature cannot be kept within the specified range, it is necessary to contact the manufacturer for assistance!
Is it possible to have a situation with low rotation speed but high efficiency?
It has been confirmed with the design team: for variable-frequency motors without separate fans, the adjustment range of the frequency converter is limited, and the speed corresponding to 0% on the frequency converter is sufficient to meet the cooling requirements
So, does it have independent fans, which allows for a large range of adjustment?
Yes, the variable frequency adjustment range of the independent fan is quite large
Is it more expensive, or is it harder to maintain?
The principle of frequency conversion is to change the frequency of the current, thereby altering the motor’s speed; hence, speed is directly proportional to the load. By low speed and high load, you mean changing the speed of the pump through a transmission mechanism; in fact, the output power is high at low speeds!
Creative thinking: I’ve seen a case at the (XX Pharmaceutical Maintenance Workshop) where the circulating water cooling system was significantly modified – an additional jacket, along with one oil pump and one water pump, were added.