I am wondering at what fan size/speed a direct drive motor is no longer sufficient to drive a fan? Phrased alternatively, what size/speed of fan requires motors with a transmission? For an axial fan.
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$\begingroup$ What kind of fan? At what speed? Your question is too vague, I think. There's an edit link ... $\endgroup$– TransistorCommented Mar 2, 2021 at 22:05
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$\begingroup$ Pick a size and speed of fan, and for \$10 I'll give you a good argument about why it should be direct-drive. For another \$10 I'll give you an argument just as good for why it should be geared. $\endgroup$– TimWescottCommented Mar 2, 2021 at 23:55
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$\begingroup$ Smarty pants. How about I pay you $30 and you answer the question as it stands as today? $\endgroup$– Jordan McBainCommented Mar 3, 2021 at 0:00
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$\begingroup$ @JordanMcBain So, have you paid up? $\endgroup$– Solar MikeCommented Mar 3, 2021 at 4:50
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1 Answer
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Often because the “standard” off the shelf motor has a running speed different to the required fan speed or most efficient fan speed.
Then it comes down to a choice of transmission or motor speed control which is influenced by many other factors.
Weight
Cost
Fixed speed or variable speed
Ambient conditions
Can all be relevant.
