Close

Log VII: The Motor Kinda Stays Asleep

A project log for Open Source Spherical Motor

Development of a an open-source, Arduino-based spherical motor to promote omnidirectional drive systems within the open-source community.

alex-dunnettAlex Dunnett 05/19/2020 at 12:050 Comments

Project done. Thesis handed. A literally colossal amount of stress later. In the end I managed to get the motor manufactured by utilizing a couple of third party companies. Though I had to increase my budget in order to do so.

Due to the lockdown I had to make everything at home DIY-style.

I think my favorite, and most successful, DIY endeavor was probably making the stators. Armed with the steel cut outs it was actually quite satisfying to make the laminated stators, using masking tape to both bond the sections together and provide a lamination between the layers. Subsequently setting them on fire was probably superfluous, but did help to spread the adhesive throughout the layers.

Unfortunately the motor didn't turn. I strongly suspect that this was partially because I didn't put enough windings onto the stator (the coil I bought was quite inflexible), but mostly because there wasn't enough power. It seemed that it wasn't possible for me to draw anywhere close to the 4 Amps that I had initially predicted would be possible.

I suspect that this was due to the power supply used. The original plan was try the device with 8 AA batteries but then if that didn't work, as I suspected it might not, I was going to use a purpose built three phase power supply unit at the university. Unfortunately though I did not get this chance.

Regardless though I measured the flux magnetic flux produced by the stator coils. As I suspected I found the flux density to be significantly lower than what would be necessary for motor actuation.

Discussions