GC-1 Motor
Brushless with Gear Change 3 Speed Gearbox

$650aud and $120aud freight ( with tyre/tube additional $50aud )

First Hub Motor ( I'm aware of) that has a gear change mechanism it. Its designed for use in mopeds but would make a very good motor for other
small electric vehicle projects. Below shows the motor being used in a moped style ebike.
 

Below shows a cross section cut away of the motor and gearbox, gear changing is done via a cable exiting one side of the motor.

        The gear change cable goes to a twist type lever which is mounted on the left handlebar. The twist gear change throttle comes with the motor kit.

The gears need lubrication and the hub shell acts as an oil sump, a small window in the side of the motor gives an indication of the oil level.

The motor is built for moped type ebikes for 10 inch rim sizes 3.0-10 or 3.5-10
(they use motorbike rim sizes rather than bicycle tyre sizes, its approximately equivalent once the tyre is on the rim to a 18 inch  tyre ( a little bit smaller than a 20inch bicycle tyre).
The tyres normally used are quite wide 3 or 3.5 inch.

       weight of motor 10kg  ( a little bit lighter than x5 hub motor)

2.       width of frame needed to mount motor- rear: 20cm

4.      48v  or 60volt versions are made, the 48volt version the controller supplied by maker is 27amps max ( not sure on the 60v version)

T    Top speeds given by manufacturer are: 1st gear : 20km/hr, 2nd: 30km/hr 3rd: 40km/hr.

6.       Gear Ratios are: first gear 1:1.73  2nd gear: 1:2.92  3rd  gear:1:4.1

        It would be possible to spoke the motor into a larger bike style rim, but would require using the 10" moped rim, drilling holes for the spokes and using
  appropriate length spokes to suit the bicycle rim, the other issue is that 20cm between the rear dropouts is needed to install the motor.
What results would be achieved by modifying the motor to be used in an ordinary , say 26" rim, I really dont know the answer. Would be an interesting exercise to find out. The motor is probably more suited to purpose built projects that require very good hill climbing but also reasonable top speeds.

       Torque Graphs Below For each gear:

       First Graph is for 1st gear: hill climbing . Interesting the motor reachs about 80% which is quite good considering the gearbox has an oil sump.
Also the torque is very large in first gear reaching near 110Nm  on 48v 23amp max is quite outstanding the hill climbing potential for this motor should
be very high.



Second Graph shows second gear results:

       Third Graph shows third gear results:

        Please note I have only just found this motor (early  March, 2009) and no test results are as yet available. I think it could prove to be a very interesting motor
being the first model that i'm aware of that incorporates an actual gear change mechanism. I will be installing the motor into a 3 wheel project ( the vehicle was built by Mitcham Girls High School quite a few  years back, and very well built indeed, all aluminium frame).
     The vehicle I intend to do the testing in is shown below ( at the moment the vehicle still has the old chain drive set up, the pics dont show the motor above installed, haven't got that far yet!!)

back to home page
Copyright 1998-2009 by Brett White on all images/text/information and graphical materials on this website.

7.     

8.