7. Motor And Battery Sizing - R-Division-2022-2023-Odd/Repo-09 GitHub Wiki
7.1 MOTOR SIZING
For our course project only 6 DC geared motors are required.
T= μ x M x g x D/2 η Here,
μ= Coefficient of Friction
T= Load Torque in N-m (convert it into kg-cm)
D= Diameter of the pulley in m
g= acceleration due to gravity
η= Drive efficiency(assuming it as 0.9)
P= 2 x π x N x T/60 Here,
P= Power in watts/min
N= Revolutions per minute(speed)
T= Load Torque in kg-cm
| Rated RPM at 12V | Rated Torque in Kg-cm at 12V |
|---|---|
| 1000 | 0.12 |
| 500 | 0.25 |
| 300 | 0.35 |
| 200 | 0.5 |
| 150 | 0.8 |
| 100 | 1.2 |
| 60 | 2 |
| 30 | 4 |
| 15 | 8 |
| 10 | 12 |
| 3.5 | 30 |
We will use the motor of 60rpm
7.2 BATTERY SIZING
| Sl.no | Components | Quantities | Operating voltage | Operating current of each component | Total current |
|---|---|---|---|---|---|
| 01 | DC geared motors | 4 | 12V | 300mA | 300×4= 1200mA |
| 02 | Arduino mega 2560 | 1 | 5V | 100mA | 100×1=100mA |
| 03 | Motor driver module | 2 | 5V | 4A | 4×2=8000mA |
| 04 | LCD display | 1 | 10V | 1mA | 1×1=1mA |
| 05 | Bluetooth HC Model | 2 | 5v | 40mA | 40x2=80mA |
| 06 | LED lighting | 1 | 3.6v | 30mA | 30x1=30mA |
| 12V | 5V |
|---|---|
| 1201mA = 1.2A | 8490mA = 8.49A |
We know factor of safety = 1.2
| 12V | 5V |
|---|---|
| 1.201×1.2= 1.44A | 8.49×1.2= 10.18A |
So we can use 5 A adapter for 12V power supply and 10A adapter for 5V power supply.
If we use batteries ,We need to run the edu bot for 2 hours .
| 12V | 5V |
|---|---|
| 1.44 × 2= 2.88 Ah | 10.18 × 2 = 20.36 Ah |
So we need 20Ah,12V capacity battery.