A few of you already know that one of our main goals is to produce a board that is dependable, long lasting with a similar product warranty to what is available in the automotive industry. Finding weaknesses, points of failure and overcoming them has been key to the effort.
Our focus this week is wheel and motor bearings, although a decision was already made earlier this year to install ceramic wheel bearings in every board that leaves our facility and now we are contemplating the merits of going full ceramic throughout our drive train and motors. It is no secret that ceramic skate bearings last much longer than steel bearings, they can last 5 to 20 times longer in most cases. So our main focus now is what benefits will they have in brushless motors?
Will the ceramic bearings also provide a thermal break preventing the heat of the stator from transferring to the outer housing? If this is the case will it extend the life of the rare earth magnets and protect them against permanent losses?
Our first effort into finding the merits of installing ceramic bearings in our brushless motors was to get a baseline temperature measurement. The baseline measurement after a mile long hill climb showed both motors with steel bearings to be 41 degrees Celsius on the outer rotor housing. This shows that the motors are heating up equally and should provide a good comparison. Today we will perform the installation into one of the motors on a dual diagonal drive and see if there is any reduction in rotor temperature