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SIZING INFORMATION - ROTARY ELECTRIC VIBRATING MOTORS AND DRIVES

In order to select the correct size rotary electric vibrating motor for any hopper or bin application, the ratio of the weight of material in the sloped wall section of the hopper, to the force output of the vibrator, must be determined. Although each application is different, most applications should have a ratio of one pound of vibratory force for every ten pounds of material in the sloped wall section of the hopper.

When dealing with bin, hopper and chute applications, the 1800 RPM higher amplitude vibrating motors usually will provide the required force in order to activate flow of "difficult" material. The 3600 RPM motors are primarily used for materials having characteristics ranging from "free flowing" to "difficult."

The following two formulas will help you select the correct size vibrating motor:

1. Weight of Material in the Sloped Hopper Section=Bulk Density of Product x Volume (cu. ft.) of the hopper section.
   
   
2. To calculate the volume of a conical hopper:
   1.0472 × vertical height × [R² + (R × r) + r²]=volume
   where R is the radius of the cone at the transition point and r is the radius of the cone at the discharge.