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Anik , 12-05-2024, 07:06 PM

I wanted to control this motor whose rating is 24VAC 4W so 160mA current maybe by 24V DC supply. Maybe I could use an H bridge motor configuration to generate a square AC voltage. But to reduce components I was thinking of two things,

Plan - 1
Use H-Bridge motor controller Similar to DRV8871 so I can give 50Hz frequency by a microcontroller.

Plan - 2
Use a H-Bridge Transformer Driver similar to MAX13256, same I can give 50Hz pwm so I can get a 24V AC.

Which on willbe best? Or will it work??

QDrives , 12-05-2024, 07:52 PM

I would go for the DRV8871.
Do note:
1) 24Vac has a peak of 24 * sqrt(2) = ~34Vdc
2) Switch at a higher frequency (>= 10kHz) and have the PWM duty cycle make the 50Hz.

QDrives , 12-05-2024, 09:45 PM

One thing I forgot to ask: does the fan have a capacitor within it?

Anik , 12-06-2024, 01:24 AM

No it doesnot has any capacitor. But has permanent magnet inside the rotor.

QDrives , 12-06-2024, 04:56 PM

https://en.wikipedia.org/wiki/Synchronous_motor