# Battery sizing and motor sizing - C-Division-2022-2023-Odd/Repo-07 GitHub Wiki

MOTOR SIZING

Mass of body to hold (m) = 0.05 Kg

Acceleration due to gravity(g) = 9.8 m/s^2

μ = 0.25

F = m * g

F = 0.05 * 9.8

F = 0.49 N

Now Torque : T = f * r

T = 0.49 * 0.4

T = 0.196 Kg-cm

Considering Factor Of safety i.e. FOS = 1.5

Final Torque = T * FOS

Final Torque = 0.196 * 1.5

∴ Final Torque = 0.294 Kg-cm @ 12V

∴ By comparing with table of specification for 0.29 Kg-cm Rated Torque , We need servo motor of specification Tower pro MG90s Operating voltage-4.8-6.6 stall current-700 mA Number of MG90s servo required =2 servo

DC motor Mass of the body=550=0.55 kg radious =15 cm = 0.15m Acceleration due to gravity=9.8 μ=0.85 F=mg μ =0.559.80.85 F=4.5 Torque=T= FD/2n 4.50.3/20.9 =0.75 kg-cm considering Factor saftey=1.5 Final torque=Tfos Final Torque =0.751.5 = 1.125

BATTERY SIZING

SL.NO COMPONENTS QUANTITY VOLTAGE REQURIED 1 DC MOTOR 1 12V 500mA 2 SERVO MOTOR 2 5V 500mA 3 AURDINO MEGA 1 5V 40mA