5.E MOTOR SIZING AND BATTERY SIZING OF THE SYSTEM - M-Division-2020-2021-Even/Repo_12 GitHub Wiki
5.E MOTOR SIZING
1. Servo Motor
Mass of body it holds (m) = 0.4 Kg
Diameter(D) = 0.03 m
Acceleration due to gravity(g) = 9.8 m/s^2
μ = 0.4
F = m * g
F = 0.4 * 9.8
F = 3.92 N
Friction
F = mg * μ
F = 3.92 * 0.4
F = 1.568 N
Now Torque : T = F * (D/2)
T = 1.568 * (0.03/2)
T = 0.02352 Kg-m
T = 0.02352 * (100/9.8)
T = 0.24 Kg-cm
Considering Factor Of safety i.e., FOS = 1.5
Final Torque = T * FOS
Final Torque = 0.24 * 1.5
Final Torque = 0.360 Kg-cm
We require Servo Motor Of Specification Tower Pro SG-90.
Operating Voltage : (3.0– 7.2 )V.
Stall current : 650 mA.
∴ No. Of SG 90 Servo Motors Required : 2.
2) DC Motor :
Mass of body it holds (m) = 0.3 Kg
Diameter(D) = 0.08 m
Acceleration due to gravity(g) = 9.8 m/s^2
μ = 0.45
F = m * g
F = 0.4 * 9.8
F = 3.92 N
Now considering friction
F = mg * μ
F = 3.92 * 0.45
F = 1.764 N
Now Torque : T = F * (D/2)
T = 1.764 * (0.08/2)
T = 0.07056 Kg-m
T = 0.07056 * (100/9.8)
T = 0.720 Kg-cm
Considering Factor Of safety = 1.5
Final Torque = T * FOS(Factor Of safety)
Final Torque = 0.72 * 1.5
Final Torque = 1.08 Kg-cm
We required DC Motor Of 150 RPM @ 12V for torque about 1.08 kg-cm.
∴ No. Of DC Geared Motors Required : 2.
3) Battery Sizing :
SL No. | Components | Quantity | Voltage Required | Current Drawn |
---|---|---|---|---|
1. | PIR Sensor | 1 | 5 V | 40mA |
2. | SG 90 Servo Motor | 2 | 5 V | 1400 mA |
3. | DC Geared Motor | 2 | 5 V | 40 mA |
4. | Arduino Mega 2560 | 1 | 5 V | 100 mA |
So, for 12 V Current Drawn(C1) = 600 mA So, for 5 V Current Drawn(C2) = 1400+40+100+80 = 1620 mA
Now Considering Factor Of Safety i.e., FOS = 1.2
C1 = 600 * 1.2
C1 = 720 mA = 0.720 A
C2 = 1620 * 1.2
C2 = 1944 mA = 1.944 A
For Time(T) = 3 Hrs For 12 V
Battery Required : 0.720 * 3 = 2.16 Ah. For 5 V
Battery Required : 1.944 * 3 = 5.832 Ah.
∴ No. of Battery Required : 1.