Selection of dc motor type and rating for a 300 kg weight electric car with 4400wh limit?

I am doing a project on electric car which weighs about 300 kg and my battery supply limit should be 4400 wh. i wanna know which type of motor and ratings has to be selected.
Car has to reach a distance of 75mts in less than 10 seconds
Max voltage rating of battery and motor : 300v
Max speed of motor with given load:50-60 kmph
Please suggest some cheap and best motor controllers used for these ratings.


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dileep kumarP (author) 2 years ago

Thank you all for your Valuable comments

Thanks - I hope your not offended, think of this we see 1000's of requests for support and input a month, our time and knowledge is given for free a little gratitude goes a long way.

Good luck with your project.

rickharris2 years ago

Mmmm no answer obviously our response wasn't detailed enough to even say thanks. Students!

Any less details possible?
How about battery voltages, controller and motor type or simple things like max current rating for the batteries?
But then again, with all that info you would not have a problem finding the motor yourself with my friend Google....

Is this a new game ?

Car-quick-how ?

rickharris2 years ago

You may not like what I put now i have read some of the contest rules and aims BUT:

As a retired teacher I feel there is only so much help you can or should give advanced students. The learning process is largely a self teaching process contrary to what we normally think of a school or University as being. A teachers job is to provide the environment in which a student can learn what they need to know and understand, NOT to tell them the answers.

I draw you attention to these paragraphs from the rules -

"The Formula Hybrid™ competition challenges teams of university undergraduate and graduate students to conceive, design, fabricate, develop and compete with small, formula style, hybrid powered and electric cars"


The Formula Hybrid competition is intended as an educational program requiring students to work across disciplinary boundaries, such as those of electrical and mechanical engineering."

"Teams typically spend eight to twelve months designing, building, testing and preparing their vehicles before a competition. The competitions themselves give teams the chance to demonstrate and prove both their creativity and their engineering skills in comparison to teams from other universities around the world."

Your question as originally posed is too vague and general. Start your design work, get someway down the road, make your own decisions based on your research. If you have specific technical questions by all means ask them here and you should/may get an answer.

We don't do design or basic research for university graduates, we are all well past that stage in our lives and had to go through that process ourselves.

You need to look at the efforts of others, Instructables and the web is awash with electric vehicle projects and plans at the moment all you need to do is search for them.

You need to have a team, (I assume you have). You need to search for and look at other similar projects world wide (greenpower racing cars is one such project here in the UK with many examples of car design). This includes looking at previous designs in your project.

You need to contact manufacturers with specific questions. You need to draw/design and repeat this process many many times to finish up with some kind of plan you can follow. What ever you build will be a prototype and need revision or improving once you have something to test and evaluate.

Good luck let us know how you get on.

I might add that this is from personal experience a HUGE undertaking and a year even for a relatively large and well disciplined team is no where long enough to have a serious expectation of success unless they are all 100 % committed in time and effort to the project - forget a social life!)

Our very simple racing car by comparison was about 6 months of work using about 2/3 hours a day to work on it. See my instructable.

PS our drivers were all 11 or 12 years old! Some of the cars were capable of 40 MPH

rickharris2 years ago

Ok the OP has PM'd me a link to the rules of the contest for anyone who wants to read up on them and try to answer the original question (not going to be easy!)

rickharris2 years ago

How fast

how far




Method of control

how much do you already know.

Need to know this and more.

dileep kumarP (author)  rickharris2 years ago

First i need to know the type of motor , then we can select the method of control.

No, first you need to answer Rick's questions THEN you select the motor, THEN you select the control.

Let me give you some examples:

here in the UK I built an electric racing car to enter a schools comp.

It was designed to go about 50 KPH and take part in an endurance trial over 4 hours using 4 12 volt car batteries. About 70 Ah each.

The motor was rated at 250 watts at 24 volts (10 amps) continuous operation but we ran it with a heat sink on it at 20 amps so 500 watts.

Now our car was about half the figure your suggesting (weight is your enemy so lighter is better).

So you can expect to start at these figures 24 volts, 500 watts = 50 KPH the acceleration wasn't brilliant.

There was also a sister comp that built a drag racer using a car starter motor and a single 12 volt battery over 100 mtrs. Some of these cars were doing 80 - 90 KPH at the end of 100 mtrs BUT they ruined the battery after a couple of runs so the contest was abandoned as too expensive.

Forget control you just need ON and OFF.

You need to direct us to your contest rules or type them out for us to view.

Design is a process of satisfying the needs of the customer, without knowing those needs your doing little more than guessing.

Not sufficient data to design. What other parameters does your competition entry have.

dileep kumarP (author)  steveastrouk2 years ago

Current ratings didn"t specified but a 400 ampere Controller is used by previous teams of the competition..