How can I make money from selling electronic motors?

Assuming there is a market for your product(s), sell them for more than you paid to make them. Advertise.

We don't know anything about your electric motors... are they for a small aquarium pump or an electric vehicle or a robotics factory... or something between these?

The same way you make money selling anything. Sell them for more than it cost you to provide them to your buyers.

If you even have to ask that question, you are not the sort of person who is suited to an entrepreneurial life selling small electronic components.

Some first

Same way as people make money selling anything else. You sell your stuff for more than what it cost for you to buy or make it.

I think you are looking for a lot more information
than you are going to get from anyone by this method.

If motors are your "thing", you will find a way.

BUY IT LOW, SELL IT HIGH, JUST PLAYING IT LIKE STOCK TO MAKE FAST MONEY.

1- what are their specs?
2- design a device and use them ...... in this case you will earn more money .....

Do affiliate marketing

Sell them for more than you buy them for.