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fahadn
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Join Date: Nov 2014
Posts: 4

Thread: Calculate DC Motor Specifications (Torque Power, etc.) for Electric Vehicl

11/25/2014 4:06 AM

Dear Sir/Madam,
I want to make an electric car like as shown in figure below., with a DC motor. assume no inclination, road is plain surface. please explain all calculation with formulas.THANK YOUfollowing is the basic known parameters:
Total mass of car(including rider and everything) = 250kginitial velocity of car = 0 (still car stop)max velocity = 60 km per hourtime to reach max velocity = 1 minute = 60 secondsradius of tyre = 8 inch
please tell me how could i find the following parameters to find accurate DC motor for my car:
how to calculate force needed by my car?how to calculate torque needed by my car?how to calculate speed RPM of a motor needed by my car?how to calculate power (watt) of motor needed by my car?how to calculate battery needed by my car to travel 10 km in one charge?
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Pathfinder Tags: ebike ev torque
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Anonymous Poster #1
#1

Re: Thread: Calculate DC motor specifications (torque power etc) for electric vehicl

11/25/2014 5:20 AM

Looks like 6th semester assignment question.I will explain an easy solution to deal this kind of problem.Try to make friendship with brainiest guys/girls in your class.In any class, you can find 8-10 extremely brilliant students and those fellows know almost anything available in the universe.Give couple of treat in a cool,decent hotel/restaurant to make them happy.Politely tell them to prepare assignment and hand it over to you one day before the actual submission date.Try to get it one day before from one of your friends and simply copy paste it.It will be a time consuming process,If your prof. need a hand written document.Meantime you can try to find an answer in yourown way to cross check your problem solving ability or you can simply spend highly valuable time to watch latest action movie.
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fahadn
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Join Date: Nov 2014
Posts: 4
#2
In reply to #1

Re: Thread: Calculate DC motor specifications (torque power etc) for electric vehicl

11/25/2014 7:11 AM

hahaha... for GOD sake... dont think like it..

im asking it for info,...really...

u can help me , by telling me exact book, article or website...
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Codemaster
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Location: Stoke-on-Trent, UK
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#3
In reply to #2

Re: Thread: Calculate DC motor specifications (torque power etc) for electric vehicl

11/25/2014 7:30 AM

If you're thinking of taking on a project like this, I'd have thought you could familiarise yourself with basic mechanics so you can work most of it out for yourself.

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Crabtree
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Join Date: Jul 2007
Location: Commissariat de Police, Nouvions, occupied France, 1942.
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#4
In reply to #2

Re: Thread: Calculate DC motor specifications (torque power etc) for electric vehicl

11/25/2014 12:27 PM

If you take the kinetic energy of the object at full speed, and subtract the kinetic energy of the object at rest, and divide by the time needed to change from the one to the other, then that is the minimum average power needed to carry out the change. Now, you need to divide by an efficiency of the arrangement and multiply by a factor to achieve a reserve then the answer is the motor power. The last two are the subject of good engineering judgement based upon experience, both your own and what you have learned from others along your journey.

Do publish your outcome and what you have learned as, after all, anything you have achieved will be as a result of standing on the shoulders of giants, to paraphrase one Isaac Nomiddleinitial Newton. Someone else may want to stand on yours.

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nick name
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Join Date: Mar 2007
Location: City of Light
Posts: 3943
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#11
In reply to #4

Re: Thread: Calculate DC motor specifications (torque power etc) for electric vehicl

11/27/2014 12:25 PM

Rest does not mean v=0 ? If it is true how do you calculate the kinetic energy of an object at rest ?
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Anonymous Poster #1
#6
In reply to #2

Re: Thread: Calculate DC motor specifications (torque power etc) for electric vehicl

11/25/2014 8:53 PM

Just check following link and give the feed back.I know one excellent website which deals with electric cars.I will share the link, if I could find the link in my bookmark bar.

Engine Power Calculator
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Anonymous Poster #1
#7
In reply to #2

Re: Thread: Calculate DC motor specifications (torque power etc) for electric vehicl

11/25/2014 9:58 PM

I hope, following links are useful for your requirement.

http://www.diyelectriccar.com/forums/

https://speakev.com/threads/calculate-dc-motor-specifications-torque-power-etc-for-electric-vehicle.5101/

http://www.diyelectriccar.com/forums/showthread.php/ev-conversion-torque-calculation-and-motor-89694.html

http://www.diyelectriccar.com/forums/showthread.php?t=11709

http://www.diyelectriccar.com/forums/showthread.php?t=15508

http://www.researchgate.net/post/How_can_we_calculate_the_required_torque_to_move_a_massive_object_by_means_of_gear_assembly2

http://www.academia.edu/4775858/Electric_Vehicle_Simulator_to_Determine_Motor_and_Battery_Specifications

http://nptel.ac.in/courses/108103009/download/M8.pdf

http://www.emic-bg.org/files/Brigham_Joffs_Electric_Vehicle_Conversion_Design.pdf

http://www.evconvert.com/tools/evcalc/

http://www.nrel.gov/vehiclesandfuels/energystorage/pdfs/42469.pdf
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SolarEagle
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Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#5

Re: Thread: Calculate DC Motor Specifications (Torque Power, etc.) for Electric Vehicl

11/25/2014 1:09 PM

Found these...

http://buggies.builtforfun.co.uk/Calculator/index.html

http://www.ev-propulsion.com/EV-calculations.html

" It will take between 6 and 8 Hp for every 1000 pounds"...

http://www.electriccarinternational.com/media/Motor-Primer1.pdf - sorry, link no longer available

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fahadn
Participant

Join Date: Nov 2014
Posts: 4
#8

Re: Thread: Calculate DC Motor Specifications (Torque Power, etc.) for Electric Vehicl

11/26/2014 2:32 AM

as far as i study.. that..F=mamass = weight of my car including rider and everything = 250 kgaccel = change in velocity per change in time...i want max speed =60 km/htime to reach max speed=60 sec.so according to formula..a=deltav / delta twe can culaculate a with the above data and formulathen it is the torque...torque = Force x radius of wheel
am i going right ???
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Crabtree
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Location: Commissariat de Police, Nouvions, occupied France, 1942.
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#9
In reply to #8

Re: Thread: Calculate DC Motor Specifications (Torque Power, etc.) for Electric Vehicl

11/26/2014 2:45 AM

Isn't that what it says in your textbook, Mildred?

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fahadn
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Join Date: Nov 2014
Posts: 4
#10
In reply to #9

Re: Thread: Calculate DC Motor Specifications (Torque Power, etc.) for Electric Vehicl

11/26/2014 2:50 AM

yes i read it from a book on google...

but im not sure,.. if its correct...

?
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Anonymous Poster (3); Codemaster (1); Crabtree (2); fahadn (3); nick name (1); SolarEagle (1)

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