12V DC Motor to AC Brushless Motor from CPU Cooling Fan - BLDC to AC Motor

How to run at 12 volts brushless DC CPU fan without its driver circuit ? You can use your single phase 220v AC Supply and step it down to 12 volts AC using a transformer so as to run it as an AC synchronous motor by slowly increasing the AC Frequency.
Once the poles get synchronized , it works just fine.
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