DIY Electric Car Forums banner

1 - 5 of 5 Posts

·
Registered
Joined
·
15 Posts
Discussion Starter #1
I have a homemade mini EV, that is currently powered by 2 Boma 48v, 1800w motors. I want to make it accelerate a lot quicker than it does now. I have experimented with gear ratios between: 8.88-12.44, and l still was not happy. I am looking for very quick acceleration, and around a 35mph top speed. I was thinking about upgrading to 2 Boma 72v, 3000w motors, but l don't know if even they will produce the torque (acceleration) that l am looking for. So, l am now looking for a single 72v motor with a lot of torque. I am considering the Motenergy ME 1012, or the D&D ES-15-6. I do not know much about these motors, or what controllers they require either. Does anyone have any suggestions on any 72v motors that are high torque (45+ Ft.Lbs.), preferably brushless, and below $675.00? I only am considering the Motenergy, and D&D motors because they are the only ones that l have heard of....however, l know there must be more choices available. Any input would be greatly appreciated.
 

Attachments

·
Registered
Joined
·
739 Posts
Increasing voltage is for top speed.

For high torque, whether loads, hills or standing starts

the key is a massive weight motor, lots of copper and iron that can handle the heat of high **currents** in order to deliver power at low rpms and thus low voltages.

And high ratio gearing of course, high rpm at the motor can deliver power much more efficiently (cooler) that way.
 

·
Registered
Joined
·
15 Posts
Discussion Starter #3
Thank you for your response. Yes, it is definantly true that voltage, gives you speed, and amperage gives you the torque. That is why I was thinking of upgrading to a 72v system, because my 48v Boma set up is rated at 1800w each motor (x2 for 2 motors/3600w), and the 72v Boma motors are rated at 3000w each. This would raise my total wattage to 6000w, versus 3600w total, that the 48v motors put out. This would increase my torque (and be more efficient in the process). The Boma motors are not available in a higher wattage than that, so if l stuck with them, l would be at the maximum performance level that they could provide, and l would still be wanting more. Thinking along those lines, l figure that one (non Boma) 72v motor rated at at least 10kw, would be more of what l am looking for. That brings be back to the question of: What 72v motor ($675.00 or less) would be a good choice for my application?
 

·
Registered
Joined
·
27 Posts
You may find something here:
https://www.goldenmotor.com/
Consider that with a single motor you will need a differential, or give all the power to one wheel only.
Another issue might be that with that excessive torque, you won't be able to steer your vehicle, as the front wheels won't touch the ground any more.
Regards, Markus
 

·
Registered
Joined
·
15 Posts
Discussion Starter #5 (Edited)
Thank you, Markus, l will check that out. At least that gives me somewhere to start looking. I actually do have a chain drive LSD, so l might use that, or l could just go with a solid axle driving both wheels, (like a go kart) since my ride is so small. I also might end up making a small set of wheelie bars to help kep the front end down. Just a heads up, l am a retired Electro/Structural/Mechanical Engineer, so l have a decent amount of knowledge pertaining to this type of thing. I have built many outrageous custom vehicles over the years, but l am new to the elecrtic scene, and therefore do not possess much knowledge on what motors/controllers are available, for my particular application.
 

Attachments

1 - 5 of 5 Posts
Top