control synchronous motor by attine 13/25/45...

hello all


anyone control a synchronous motor AC 12V ? i wnt to use Power DC 12v , then make a circuirt DC -AC 12v 50hz to it work. However, when use a Square 50hz , i hear sound from motor ,it noise .

Any idea to it work smooth ?


https://www.ebay.com/itm/TYC-50-AC-1...-/401443470936

Hi,

If you want to suppress overtones, then you need a low pass filter.

Klaus

The AC source needs to be a sinewave in order for the motor to be quiet.
Buzzing is common from motors driven by square-wave or modified sinewave inverters.

A full H-bridge turns DC supply into AC to the load.
For the bias apply a signal from a sinewave oscillator:
Bias amplitude needs to reach 12V so it can turn on the NPN high-side transistor.

Or as an alternative create an auto-bias network from an LC arrangement made to resonate at 50Hz.

Hi,

or use an integrated circuit, like an audio class D amplifier with 50Hz sinewave input.

Klaus