Do you know the biggest differences between the AC and DC motors? Well, some of you would say, “The DC motors will require brushes, while AC motors don’t have it!” Beside that, do you know that the speed of the AC motors was controlled by frequency instead of voltage as well? Today, you’ll learn and study the fundamental of AC motors better!

The AC theory

There is a slightly different between the AC Current and DC Current, where the AC current polarity is constantly inverting in any given period.

Below here is the figure of the AC wave:

Ok, let’s take an example. Normally, you’ll connect the positive lead to the positive terminal of the battery holder, and the negative lead to the negative terminal. However, if you want to generate the AC current, you need to connect the leads normally for half a second and then invert them (Note: After half a second, you have to connect the negative led to the positive terminal and the positive lead to the negative terminal). Repeat this process constantly and you will get an AC current operating at one hertz (1 hertz)!

The calculation of hertz is 1/period, while the period is the time the current is positive plus the time it’s negative in one cycle. As a result, it would be 0.5s + 0.5s = 1s per period. [link]

Related Posts