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Old 07-20-2019, 12:16 AM   #21 (permalink)
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It all depends on what kind of motor the fan uses.

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Old 07-20-2019, 12:19 AM   #22 (permalink)
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PWM is more efficient than a rheostat, no?

... and that reminds me of this video:

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Old 07-20-2019, 02:32 AM   #23 (permalink)
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PWM is more efficient than a rheostat, no?
What reading I did suggested varying the frequency instead of chopping into pulses. It made me wonder if you could use a diode to make a half-sine wave and then switch it in and out for a two-speed control.
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Old 07-20-2019, 03:27 AM   #24 (permalink)
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You can try half wave.
The only way to reduce speed on an induction motor with out burning it up is change the number of windings or changing the frequency.
Or design the motor to run horribly inefficient and not burn up with partial voltage.

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