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Best way to regulate single phase induction motors (like fans and pumps)
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Siwastaja:

--- Quote from: Simon on November 24, 2018, 01:46:30 pm ---what is the scope of the project in reality and what could you use that has speed controllable brushless motors? Fans with speed control you can certainly get even for 110/220VAC

--- End quote ---

And these fans with speed controls are very widely AC induction motors with a triac (or even autotransformer) speed controller.
Simon:

--- Quote from: Siwastaja on November 24, 2018, 01:54:20 pm ---
--- Quote from: Simon on November 24, 2018, 01:46:30 pm ---what is the scope of the project in reality and what could you use that has speed controllable brushless motors? Fans with speed control you can certainly get even for 110/220VAC

--- End quote ---

And these fans with speed controls are very widely AC induction motors with a triac (or even autotransformer) speed controller.

--- End quote ---

whatever they are they are made to speed control. As the ones I see that run on mains come from supplies of DC 24 and 12 volt fans I would not assume triac control which is a really bad idea for induction motors.
Miyuki:
For fans they say in datasheet:
Speed control
Smooth or stepped speed control can be performed
by external thymistor or transformer.
Several fans can be connected to one speed controller
if the total power and operating current of fans do
not exceed the rated controller values.
230V 80W 0,34A
Simon:
Well if the fans allow it then just use PWM with a thyristor, it's the simplest solution.
Siwastaja:
The datasheet is clear. This is the typical kind of fan ACIM that is designed to be "dimmed" using voltage or phase angle modulation. It's not optimal at any operating point, but it's cheap and traditional. So, a good old thyristor dimmer will do, but I hate the mains frequency buzz with such fans; a transformer makes it quiet.
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