How to make a 5 kg war bot for Robo sumo( part 1) .....

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 If you are want to make a 5 kg sumo robot for Robo war then you must have to follow some theory. I am telling you the right theory behind those bot's, and with out this theory you are not able to understand that how much power and torque will required to operate your bot. 1. Circumferential Velocity Calculation: If you are think that at first you chose the motor and then you will find wheels for your Bot, then my friend your idea is totally wrong. At first chose your  Bot's wheel then calculate the circumferential velocity. Now, usually in most of cases we are using 2 or 3 inch wheel for our 5 kg war bot. Consider 3 inch wheel and we will get the Circumference is 0.235 metre. Remember this one you have to convert those units in SI. And suppose consider your motor's RPM is 300. Now, Circumferential Velocity of your bot is Vs= (π * D *N)/60 ;        (π * D) is  Circumference of wheel                                                                               =(0.235*300)/
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REALITY OF ELECTRIC VEHICLES

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Today's most trending topic ,Is Electric Vehicles are more Eco-friendly choice in India?
India emits around 3 Giga tonnes of CO2 and other greenhouse gases per year globally.
And the maximum energy of grid is produced from burning the coal and few from natural gas is around 57% in India. Now if the power station with an efficiency of 34% burns coal, it emits 1.0 kg CO2 for generating of one kwh of electricity.( That means  1kwh electricity = 1 kg of CO2).

 Nearly 25% of this emission occurs due to each and every types of road transport vehicles. Now in order to reduce emitted greenhouse gases slowly we should move on to the Electric vehicles (EV). That’s why many privet vehicle manufacturers are manufacturing different types of EV’s.  Many of peoples are appreciated that  all EV’s are environment friendly then the conventional IC engine vehicles (ICV) .

But is it true?

No, EV's are not recently purchasable Eco-friendly, It's takes some time to make it Eco-friendly.  

  To understand this at First compare two similar SUV’s in there same segment one is TATA NEXON EV another is TATA NEXON DIESEL. Both the cars have very similar power output, torque and design in there segment. 

 TATA NEXON DIESEL: TATA NEXON DIESEL is a 1.5 L Turbo charged diesel engine car. Which has the mileage of around 17 to 22 kmpl, company claims that. That car has a power of 108bhp and maximum 260 Nm torque. This is a SUV segmented car. 

 

The overall efficiency of this ICV car is around 25%.

CO2 emission of TATA NEXON DIESEL: For an Indian car annually runs average around 12000km, mostly runs around 15000 km. Let’s consider the 15000 km and this value is really helpful for us during compare the both cars. 

for running 15000km that car needs to burn 833.34lit of diesel (mileage consider as 18kmpl).

Fuel Production phase: for 833.34lit diesel purification we need 883.34kw power that generates 503.5 kg CO2 (833.34*0.57*1.06).[1.06kwh power is required to purification or refining of 1 litre of gasoline.] 

During running: for burning 833.34lit diesel CO2 emits around 2233.35 kg CO2 per year (833.34*2.68).

TOTAL CO2 EMISSION: [total CO2 emission per year is =fuel production +during running the car]

=503.5*y+2233.35*Y   [y is the time constant of year]

=2736.85*Y kg of CO2 emits per year running the car .


 TATA NEXON EV: TATA NEXON EV is a fully electric suv car and it’s reach upto 312 km maximum range during a single charge. The battery pack used in this is a 30.2kwh li-ion battery. The car has a power of 127bhp and maximum torque is around 245 Nm.

The overall efficiency of a EV is around 70% .

CO2 emission of TATA NEXON EV: for running 15000 km that car needs to charge 48 times (consider 312 km range of this car for a single charge) [15000/312=48]. 

Charging the battery: 30.2 kwh battery for 48 times recharging needs total power of around 1452 kwh. During charge the total amount of CO2 emission is around 1076 kg (1452*0.57*1.3).

During Battery production: The average value of CO2 emission is 177 kg CO2/kwh power. So for the 30.2 kwh battery pack total emission is around 5.3 metric tonne of CO2 For production 30.2kwh battery emits 5345.4 kg CO2 (30.2*177).

Total CO2 emission: [during charge per year +battery production]

=1076*Y+5345.4 kg CO2.

In order to compare the CO2 emission for a single year simply put Y =1 and you get that the CO2 emission for BV is much higher than ICV because the high CO2 emission of production of battery.

But when you put Y=more than 3 you get the BE emits less CO2 then ICV that is remarkable point.

 Above equations simply said that after 3 years of using, your EV emits less CO2 then ICV, because the CO2 emission during battery production is very high. 

 

For  this chart you can simply understand that the total 4 years of using both the cars the EV is starts to move on to the GV, for more larger battery it takes more than 6 to 7 years to make it Eco-friendly. But ultimately the life cars are not more than 8 years.

 In this study we understand the actual CO2 emission of a conventional ICV and an EV through this production to life time using. CO2 for an EV is depends upon not only the power sources but also the battery production. Obviously the source of power generation played a big role. If we move on to the renewable energy sources the CO2 emission is reduces and it will take lesser time to make it eco-friendly.  

Location: Midnapore, West Bengal, India

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