7.MOTOR SIZING AND BATTERY SIZING: - P-Odd-2022/Repo-12 GitHub Wiki

MOTOR SIZING:

The motors used in our model are:

  • 1 DC MOTOR
  • 1 SERVO MOTOR
  • 2 STEPPER MOTOR

FORMULAE:

  • T=Mg/d
  • Battery sizing= torque(T) * Factor of safety(FOS)

For dispensing dettol:

  • m=30 grams
  • T=m*r
  • 0.03*4=0.12kg-cm
  • FOS=1.5
  • Total torque=1.5*0.12=0.18 kg-cm
  • DC motor size should be around 10 rpm.
  • For our convenience we use DC motor of 10 rpm as r is neglected.

For dispensing cotton and band-aids:

  • m=20 grams
  • T=m*r
  • T=0.02*4=0.08kg-cm
  • FOS=1.5
  • Total torque=1.5*0.08=0.12kg-cm
  • Motor size should be around 60 rpm and here stepper motor is used.

For dispensing tablets:

  • MOTOR: Here SERVO MOTOR with higher torque is used.

BATTERY SIZING:

  • For battery sizing, FOS=1.2

  • We are using one 12V 2A adaptors and one 5v adapter for our model and one 3.7V battery and 1 DC motor,1 servo motor,2 stepper motor.