How do I pick the right motor?

General Discussion about large electric scooters and motorcycles and other things with no pedals.
Post Reply
the_imperium   1 µW

1 µW
Posts: 3
Joined: Oct 07 2017 10:51am

How do I pick the right motor?

Post by the_imperium » Oct 07 2017 11:13am

Hey there,

I am working on my first all electric build. I need help choosing the right motor. How do I calculate the torque power and all that stuff? Also which motor type should I use? DC or AC or IPM.. As far as I researched on the internet IPM seems to be the right choice. But I am not able to find manufacturers for these motors. What voltage should I run the motor at? A higher voltage means a less amp for the same power,right? Does that mean I get extra miles for the same battery pack?

How do I calculate the torque,power and other stuff of a motor which should satisfy these :

Weight of the motorcycle: 150-165 Kg (or) 330-363 lb
Weight with load : 300-320 Kg (or) 660-705 lb
Top Speed : 170 KMPH (or) 105 MPH


Thanks
Imperium

User avatar
motomech   1 GW

1 GW
Posts: 3168
Joined: Sep 11 2010 12:21am
Location: Tucson Az.

Re: How do I pick the right motor?

Post by motomech » Oct 07 2017 11:26pm

You want to address this in the Electric Scooter Motorcycle section.
Motomech

'03 Rocky Mountain Edge 2WD 260 Q100H frt and Ezee V1 rear 2 Elifebike 20A & 25A 9-FET controllers 12S/20Ah Multistar Lipo rear 5Ah Turnigy frt Luna Cyclops Extra lite Alex 24DM rims, Crazy Bobs run ghetto tubeless. 25 mph. Mean Well HLG-320H-54A
viewtopic.php?f=3&t=83430
'07 GT Idive 4 4.0, Q100C 201 14S LiPoly elifebike 9-FET 20A controller. 23 MPH.
viewtopic.php?f=3&t=49691&p=1378484#p1378484

e-beach   100 MW

100 MW
Posts: 2710
Joined: Jan 10 2012 9:48pm
Location: Any Los Angeles area beach I am at. Or Santa Monica or possibly the south bay beaches.

Re: How do I pick the right motor?

Post by e-beach » Oct 07 2017 11:47pm

Favorite Quote: "This is L.A., sugar. There is no 'over the top." --- Chris Erskine

Current build: Liahona w/ cheap front suspension and suspension seat post. Yescomusa 36v 800w generic front hub motor. 15ah Headway triangle mounted pack. Tronsung 30 amp,

Previous Build:1992 Trek Antelope 800 - Bone Crusher (no suspension) - Yescomusa 800 watt 36 volt front wheel kit. Don't do it! Get suspension!!!

the_imperium   1 µW

1 µW
Posts: 3
Joined: Oct 07 2017 10:51am

How do I proceed with claculations?

Post by the_imperium » Oct 08 2017 2:23am

Hey there,

I am working on my first all electric build. I need help choosing the right motor. How do I calculate the torque power and all that stuff? Also which motor type should I use? DC or AC or IPM.. As far as I researched on the internet IPM seems to be the right choice. But I am not able to find manufacturers for these motors. What voltage should I run the motor at? A higher voltage means a less amp for the same power,right? Does that mean I get extra miles for the same battery pack?

How do I calculate the torque,power and other stuff of a motor which should satisfy these :

Weight of the motorcycle: 150-165 Kg (or) 330-363 lb
Weight with load : 300-320 Kg (or) 660-705 lb
Top Speed : 170 KMPH (or) 105 MPH


Thanks
Imperium

the_imperium   1 µW

1 µW
Posts: 3
Joined: Oct 07 2017 10:51am

Re: How do I pick the right motor?

Post by the_imperium » Oct 08 2017 2:28am

Thanks I ll check it out. Sorry I will address it there.

John in CR   100 GW

100 GW
Posts: 13510
Joined: May 20 2008 12:58am
Location: Paradise

Re: How do I pick the right motor?

Post by John in CR » Oct 09 2017 10:56pm

You essentially want to match or exceed the performance of the top production e-motos pushing a heavier load than they do. I hope you're talking about flat terrain and relatively short range, because otherwise how can you expect to out engineer the top people in the industry with your first build?

Since you're looking at the weight of a gasser moto, start there with the power requirements for the performance you want. Power = torque X rpm, so an electric motor rated for the power you want is all you need, leaving only the correct gearing ratio to get you where you want.

More important than the motor type is what battery pack do you plan to use, because if you seek truly useful range, then the battery will be the heart of the system and is the biggest, heaviest, and most costly component in your system. Plus the frame needs to be built specifically for the battery pack.

User avatar
marcexec   1 kW

1 kW
Posts: 381
Joined: Mar 10 2009 8:20am
Location: Dublin, Ireland

Re: How do I pick the right motor?

Post by marcexec » Oct 20 2017 9:42am

Check my list on the Wiki: https://endless-sphere.com/w/index.php/ ... _Selection
Sort by power/weight ratio :)
A motorcyclist is never late, Frodo Baggins. Nor is he early. He arrives precisely when he means to.
My Suzuki RF400 build: now with Enertrac MHM602 and 6kWh AESC modules protected by a Zephyr BMS
Renault Equation modded to 10S6P recycled laptop 18650s & 1kW controller.
Master of Electric Motor Selection: "Adopt a motor" (PM me if you have trouble editing)
All the gear, all the time!

Post Reply