EVT hub motors - any experience with them?
I'm thinking about getting an EVT hub motor for a project - just wondering if anybody has any experience with them.
Thanks!
Here is a link to Electric Motor Sport in Oakland.
http://www.electricmotorsport.com/PARTS/parts.htm
Mark Higley
They are here and they don't even know it.
I'm planning on building up a new bike from scratch with a hub motor at each end. I'm guessing that an Alltrax controller will work? It's a brushed motor, so I'm thinking that it won't need a type specific controller.
I saw it on the Electric Motorsport site - I'll give them a call and let you know how it goes.
Thanks for the comments!
I can give you some info on the EVT motor.
Yes, it's brushed. It's also sealed, so heat build up can be a problem. It runs very nicely with an Alltrax. Electric Motorsport (I work there) has run it up to 72 volts - in fact we just finished a very nice 72V conversion - 55 mph indicated.
You need to be careful with the current, or you'll burn it up. The stock EVT controller is a max of 120 amps; but if you run that continously you'd better have a light touch on the throttle. We deliver them with 95-115 amp limits, and always leave a programming cable in for easy adjustment. If you are running all on the flats, you can deliver a little more. The more hills, the lower the current should be, as the bike sees steep hills just like hard acceleration. It's the temperature that will really kill this motor. I would suggest you ride carefully over a variety of conditions (including length of trip) and keep feeling that motor - wamr is ok, hot is not. Wish I had quantitative data to give you.
There is dust build up from the brushes, and the motor should be cleaned every 2000 miles. Use a gear puller for both removal and replacement of the hub. Compressed air is easy and will do a pretty good job. You can use cleaners (solvents) if you're careful.
It's a nice motor. Maintenance will help. Longest I've seen a customer get out of this is 7500 miles. EVT doesn't sell brushes, but I've heard there is somebody in France who does.
Good luck!
The bike is for kart tracks and hammering around the neighborhood - no extended runs or serious hills but lots of short bursts of reasonable acceleration.
Thanks for the answers - that's a BIG help!
Craig,
A lot of us here have been sharing, ad nauseum, our trials and tribulations getting small gains in performance and relaibility out of our shoddily-built e-scooters.
Meanwhile, you repeatedly come on here bragging about your 58 mph hub motor. If you are going to contribute meaningfully to this forum, you need to explain, in at least in general terms (rewinding, commutation timing, new magnets, wahtever), what you did to your EVT motors to obtain such an rpm and torque increase.
Otherwise, why bother coming to this forum?
PJD
Electricmotorsport is the same source I thought of.
I notice that the prices for electric motors or at least the EVT motor and the PMG132 increased since the last few month.
I remember the old price of 500USD for the EVT one at electricmotorsport.com
The price for the Perm motors increased as well... hmmm
I have ridden one of Craig's vehicles and seen them run many other times. He does know how to make high speed machines.
- David Herron, http://www.7gen.com
I did get a quote from them for the motor - and got all my questions answered. The project I'm working on now is costing a lot more than I expected - so the EV is on hold 'til I'm done with the present one. Two projects at the same time tend to result in nothing getting finished here......
Anyway, that hub solves a ton of design & fabrication problems - I'm looking forward to using them.
What I find frustrating is that the 48-volt RPM limits on the stock EVT or e-max hub motors are not some kind of technological barrier, they are simply the deliberate design of the motor - dictated by speed limitations many countries (but not many US states) impose on scooters. This, in turn, is perversely preventing wider acceptance of these vehicles.
I'll move this discussion to "motors and drives" since Craig is obviously not going to contribute.
PJD
So what do you think we can do dupicate Craig's design ?? I am guessing if the motor is rewound, the less the number of turns will make it faster but will it not lose a lot of torque that it would be useless in accelleration from a stop ??
I don't have any experience with them but have heared some references from evt-scooter users...favourable is the great efficiency of the motor (up to 95%). Quality of their scooters is good as well, never heared about complaints. You know where to get the motor? As far as I remember it should be priced arround 500USD. Which controller do you want to use, the evt one?
BTW, what are you planning to build up with the motor? converting a gas scooter?
Cheers Max