choice electric motor

[mauritius]

Hello, we have to choose a motor for handling a brush for cleaning a home photovoltaic panel. the brush is about 1 meter long (circular section d=30mm) and has a weight of about 3 kg with an axial inertia moment of about 300 kg/(mm^2). our doubt concerns the speed of rotation: for our application it is necessary a rotation speed of 180 rpm, therefore a reducer is necessary. from online catalogs the rotation speeds are around 1400rpm, fairly high values. are there criteria of choice in such application? Does anyone have experiences about it? doubts arise from the fact because it is complex to calculate the resistors pairs and therefore also the speed of rotation (reduction reports, torque and necessary power).

 

[meccanicamg]

hi! first you need to consider the strong torque that you need formed substantially from the friction force of your brush and the moment of inertia (valid at the point with acceleration different from zero and non-consistent speed).

if the engines have nm = 1400 rpm, a gearbox that makes 180 rpm gives rise to a reduction rapprote i=7.7 therefore between 7 and 8. search a catalog reducer that has a compatible transmission ratio (bonds have 7 or 9 if I don't remember bad).
choose the electric motor you want, table performance (about 0.85) the reducer you need (return about 0.5 if screwless). calculate the maximum power you can have, the multiply for service coefficients and you will get a value to compare with your application requirement.

if you look at the bonfiglioli catalogue there are pdfs with calculation explanations. I suggest you not to use a rotating brush system but rather a kind of cinematism as effective as that of the wiper