Shredder Drive: Difference between revisions

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=Motor Torque=
=Motor Torque=
*[[Motor Torque Calculator]] says about 1 kg m for 3000 rpm with 3kW drive as in [[Treadmill Motor]]. Compare to 173 kg m for strongest torque relevant to tractor drive as in [[15000 In Lb Motors]].
*[[Motor Torque Calculator]] says about 1 kg m for 3000 rpm with 3kW drive as in [[Treadmill Motor]]. Compare to 173 kg m for strongest torque relevant to tractor drive as in [[15000 In Lb Motors]].
*Our goal is in between for now, 30 kg m.
*Our goal is in between for now, 30 kg m. Reduction of only 30x to 100 RPM.


=Geardown=
=Geardown=

Revision as of 18:59, 31 May 2020

Calculations

  • Largest force comparison- 15,000 in lb or 173 kg m. (1730 Nm)

Shredding Rate

  • Precious plastic shredder - what is shredding rate of precious plastic shredder? 3kw, 50kg/hr. [1]
  • By comparison, we have 5W steppers. Minebea_Stepper_Motor_Specs
  • This allows us for 3000/5=600x less throughput. This means that for 12 hour run time, we get 1 kg of shred.
  • This is minimal, but doable for production or 2 filament spools/day. This means. $1200 revenue/month if selling spools at $20/spool.
  • This is a mere 5W. Use 100W - and get 10x-20x the production rate - of 20-40 spools/day. That is a potential business.

First Order Shaft Torque Calculations

Motor Torque

Geardown

Belt Geardown

Gears

Planetary Gears

Motor Choices

  • Brushed motor is 75-80% efficient. [2]
  • We can try a small DC motor, 30W. This yields a theoretical 12 kg per 12 hour day grind rate, which is just about correct. [3]
  • Ex. JYCRS390H - [4]. Not 30W. Appears to be 5W - [5]

See Motor Selection Criteria

Internal Links