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  1. woodygb

    Wheelchair inefficiency

    The "terrible response" that you refer to is a consequence of the wheelchair manufacturers programming of the controller and once programmed "correctly" it becomes very responsive.... some disabilities will of course require different settings...
  2. woodygb

    Wheelchair inefficiency

    The Invacare gearless brushless ..refered to earlier in this thread ...is ..as suggested in it's title blurb... direct drive. Not really a quantum leap in efficiency as reported by Sam.
  3. woodygb

    Wheelchair inefficiency

    NO...As I don't use one or currently own a wheelchair. Seems that you have decided to build a mobility scooter...Fine. I might however suggest that you investigate what a disabled person might require/need in the way of a wheelchair . I therefore suggest a read of these 2 threads. The real...
  4. woodygb

    Wheelchair inefficiency

    Indeed. Motor specs Level ground Climbing max gradient.
  5. woodygb

    Wheelchair inefficiency

    Hasn't the Amps and volts required to move the reduced mass @ the same speed changed? watts = torque x (2 PI/60 ) x ( rpm/gear_ratio )
  6. woodygb

    Wheelchair inefficiency

    I'll have to do a little more research on the watts required to move a mass....as I find your 50 watts per 225 kg's a little low... but I'm no expert. edit :- research ( Google ) done ...Rolling resistance equation modified to output approx 10 watts per 100lbs. Revised as per your...
  7. woodygb

    Wheelchair inefficiency

    For what it's worth ...which may be nothing as I keep finding spreadsheet errors... It's murder checking your own work! :x
  8. woodygb

    Wheelchair inefficiency

    MOTORS = 249.6 watts MOTOR ...singular.... 5.2 x 24v = 124.8 watts :) 172 watts into motor ... 65 watts into gearbox ...51 watts out of gearbox to move the mass ... 121 watts loss 344 watts into motorS ... 130 watts into gearbox'S ...102 watts out of gearbox'S to move the mass ... 242...
  9. woodygb

    Wheelchair inefficiency

    The Golden motor has been discussed over on the wheelchairdriver forum ... the specs don't really seem cut it for a wheelchair @ 24v. IF my spreadsheets are correct PMDC motor/gearbox combos in wheelchairs are horribly inefficient .... around 30% efficient on the flat when driven @ approaching...
  10. woodygb

    Wheelchair inefficiency

    Sam, Have a look at this typical wheelchair motor and gearbox combo. http://www.asidrives.com/pdf/adl100.pdf You'll see that the no load amps is 5.2 amps = 124.8 watts loss in the motor and gearbox. I've calculated this motors no load amps to be around 1.6 ... hopefully the maths and...
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