Why doesn’t my electric motor work?

[grade11studentgoaat]

Homework Statement

i thought i made it perfect

Relevant Equations

none

 

[marcusl]

Based on your photo, a few observations are possible. First, your axle is metallic, likely shorting out the copper wires leading to your rotor as well as the wires from the battery. Second, your rotor seems to have very few turns. I would expect to see hundreds (or more!). Third, you do not appear to have wound your rotor windings around a ferromagnetic core, such as a steel bolt, that would concentrate magnetic flux and improve chances of operation. It would also give you a flywheel action that would tend to keep the motor spinning once it was started. You can provide us with additional information as we proceed.

 

[grade11studentgoaat]

i will try out what you said. thank you for your feedback!!!

 

[jrmichler]

Also, those 6 volt lantern batteries have internal resistance about 1 ohm. The small amount of wire in the winding has very low resistance, so the battery voltage will drop to near zero when running this motor. Try using smaller diameter wire, say about 30 gauge, and at least 100 turns in each pole winding. More turns would be even better. And that 9 volt battery on your table is even worse because the internal resistance is much higher.