# How to find required size of AC gear motor for planetary mixing application? [closed]

I want to find a suitable AC or DC gear motor for concrete paste mixing. The application details are given below

Material type - concrete paste RPM - 30-200rpm Qty of material - 30Liters Mixing style - Planetary To understand the type of mixer, you may consider bakery mixer.

Can somebody help me how to calculate the capacity of gear motor that I have to select for this application?

## closed as too broad by Fred, Wasabi♦, Solar Mike, hazzey♦, AndrewMar 18 '18 at 12:20

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Assuming the blades lifting up carry half of the weight of the mix, $$w=30/2 (2.5)\space with 2.5 = density\space of\space mix.$$ w = 37.5 kg. And the work mixer has to do at 100rpm is
$$W = (37.5)9.8.100( 0.5)/60seconds/mins= 306.25 watts$$ This is a very rough approximation. One would need to consider the clumping of the concrete, potentially clutching of the mixer, etc. So for a 200rpm mixer, you'd need a 612-watt motor, say one horsepower.