Motor failure

Hardware failure is a fact of life with an event like PiWars. This time one of the gun flywheel motors suddenly stopped working. Swapping the ESC from the other motor, I found that the fault stayed with the motor. Putting a multimeter on the windings, it seems that one of the phases has gone open-circuit (which suggests that a wire has snapped somewhere inside the motor).

Fortunately, I have a policy of always buying 1 more of each unique part than we actually need for the robot. That came about after we had a gearbox failure just before a previous piwars.

In this case, that policy was especially handy since these motors (EMax MT2206) have been in use since 2018 (we used them on tigerbot and wall-e), and it turns out you can no longer get them in the UK – we’d originally got them from TME in Poland, and since Brexit, TME will not sell to UK customers.

Anyway, after swapping in the spare, the nerf gun is operational again. Phew!

Leave a Reply

Your email address will not be published. Required fields are marked *