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  1. J

    Crazy "knee" scooter.

    Ok, so modified a mobility scooter a while back: https://www.youtube.com/watch?v=Ib5SEWjYTJ0 I machined out the wheel hubs to fit larger wheels and slight over-volted it with a 8S LIPO setup. It lasted for years, but the controller finally died the other day after hours of kids off-road...
  2. J

    Crazy idea: Wheelchair motor mid drive.

    I had some wheelchair motors. These are insanely heavy duty brushed motors made for pushing fat people around town. The motor is 24v, and can be over-volted. It has a gear down reduction, and the shaft goes perpendicular (off the side) of the gearbox. It also has an indention that easily makes...
  3. J

    Building a sporty EV. Need some help estimating performance.

    I've been piecing together parts for a while now, and I'm in the market for a Datsun 240z as the donor car. It will be manual transmission with a curb weight of 2300 lbs (ICE equipped). It will likely not exceed 2500 lb post conversion. EV Parts going in: HPEVS AC35x2 motor Dual Curtis...
  4. J

    My electric Volkswagen Sandrail (Dune Buggy).

    Equipment: 90AH, 103.6v nominal, 20C LIPO battery pack. I discharge them at ~7C. HPEVS AC-20 Motor Curtis 1238-7601 Controller. Power sent through 4 speed VW, no clutch. W7qHHbTEPa0 4Mf658k3jn8 :mrgreen: The whole car has lots of nice tech in it. Electric parking brake (via linear actuator)...
  5. J

    Belt drive for Motenergy ME1003.

    I've decided I want to avoid the chain drive route for noise reduction. Dimensions of motor shaft: 7/8"x 1-5/8", 3/16" key Random details: Motor will run at 74V nominal load (ball parking 3000 rpm, correct me if I am wrong). Total vehicle weight will be 100-200 lbs max. Not sure of final...
  6. J

    Temperature effects on PM neodymium motors.

    I discovered an excellent article with a detailed analysis of motor design, specifically covering the effects of temperature on motor efficiency. http://revue.elth.pub.ro/upload/427181art9.pdf It's a really good read. If there is such a strong relationship between motor temp and torque, has...
  7. J

    First post. Already well on my way to a mean EV.

    I currently have: 30Ah & 59.2V nominal LIPO battery pack. [edit:] (1.776 kWh) ME1003 brushed PM DC motor, 11.5 KW, 200A continuous (23KW, 400 peak 1 min). 72V max. No motor controller yet. Still deciding. I have a 24v 120A controller for a low speed test on a chassis. For starters, what...
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