Adesso NUSCAN 3200 series User Manual download pdf (Page 21)

Shake and Bake:

Preliminary Design Report

October 12, 2011

Motors and Gearing

Because significant friction occurs between the screw and material, the screw and

housing, and the material itself, an exact value for the torque required from the motor is difficult

to calculate. A model needs to be constructed and tested to incorporate friction values into

torque requirements. To acquire the torque requirement for the motors, various auger companies

and motor companies were consulted based on the project scope. These companies concluded

that several motors are capable of driving this dispensing system. They also concluded that there

are several motors that meet the specifications and fit the budget. One engineer from Molon that

was consulted estimated that the necessary torque would be between 2 and 5 inch pounds of

torques. From a table found on the internet, 557.6 in*lbs of torque is roughly one N*m.

Therefore, the metric torque requirement should not exceed 0.009 N*m of motor torque. The

current dispensing motors selected provide .3 N*m at 60 rpm. Because the torque supplied by

the motors is significantly higher than the torque requirements, the motor may be geared to

decrease torque and increase rpm to ensure that one cup of ingredient is dispensed in 75 seconds.

The flow rate required to achieve this dispensing time is 3.15 cm

/second. Using Screw Design

1, which outputs 8.576 cm

/rev, the minimum required rotational speed is 22.0 rpm for 75

seconds.

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Adesso NUSCAN 3200 series User Manual Page 21