9. Motor Sizing And Battery Sizing - L-division-2020-2021-odd/Repo-11 GitHub Wiki
Motor Sizing
The weight of the rotating disk is m=density * volume.
volume=pi * r * r * d=3.14 * 5 * 5 * 2=157.09 cm^3.
Density of the acrylic sheet is 1.185 g/cm^3.
mass =1.185 * 153.09=181.14 g.
Force = mass * acceleration due to gravity.
Force= 0.18114 * 9.8 = 1.775 N.
Torque = Force * radius = 1.775 * 0.05 = 0.08875 Nm = 0.90477 kg cm.
Total torque = Torque * factor of safety. = 0.90477 * 1.5= 1.3571 kg cm.
The motor with rated rpm of 60 is required.
POWER CALCULATION
| SI NO | COMPONENTS | CAPACITY | QUANTITY | TOTAL CAPACITY |
|---|---|---|---|---|
| 1. | DC geared motor | 12v,300 mA | 2 | 600 mA |
| 2. | PIR sensor | 5v, 10 mA | 2 | 20 mA |
| 3. | Arduino | 5v, 100mA | 1 | 100 mA |
| 4. | LCD display | 5v, 200mA | 1 | 200mA |
| 5. | Buttons | 5v, 5 mA | 5 | 25 mA |
| 6. | real time clock | 5v,5 mA | 1 | 5mA |
| 7. | Buzzer | 5v,50 mA | 1 | 50 mA |
Total Rating .
| Voltage rating | Current rating | Current rating with FOS |
|---|---|---|
| 5v | 400mA | 480mA |
| 12v | 600mA | 720mA |