E.MOTOR AND BATTERY SIZING - P-division-2020-2021-even/Repo-14 GitHub Wiki
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MOTOR SIZING
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1.SERVO MOTOR>
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Mass of body it holds (m) = 0.4 Kg
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Diameter(D) = 0.03 m
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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) = 4 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.
- BATTERY SIZING. |SL No.| Components |Quantity| Voltage Required| Current Drawn| |1. |IR 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.