Cheap Brompton Conversion Kit?

[patpatbut]

They're slightly different, but they both work the same. I've never noticed any difference in any of them performance-wise apart from the SWXU, which is much smaller. The SWXB has the advantage that it's easy to open. You need a special tool for the SWXK.

Thanks again. How about SWXU and Q100 front 36v 328rpm? They have a similar weight so would the power and internal gearing the same?

Pat

 

[Deleted member 4366]

The Q100 is an entirely different motor. The rotor spins much faster. It's gears are completely different. It uses two-stage reduction gears. The SWXU is rated at up to 220W, the Q100 at up to 350W, which is 60% more powerful.

 

[patpatbut]

The Q100 is an entirely different motor. The rotor spins much faster. It's gears are completely different. It uses two-stage reduction gears. The SWXU is rated at up to 220W, the Q100 at up to 350W, which is 60% more powerful.

So it does give more torque than SWXU in this case? when both spin at 340rpm with 36v?

Pat

 

[shemozzle999]

Anyone does know the answer?

Pat

Hi Pat,

The SWXB and SWXK both have 1:4.3 internal reduction gearing whereas the SWXU has a ratio of 1:5.4 therefore the rotor in the SWXU will be turning faster to give you the same wheel rpm as the other 2.

The noise levels of all 3 motors are about the same but the SWXU will be at a higher pitch.

You have the choice of running them over voltage to increase speed or over current to increase power, both of these choices take the motors outside there original mechanical and electrical design parameters resulting in loss of efficiency and thus would require a larger battery to allow for these extra losses.

I don't condone it, but it would be better to to fit a higher power rated motor to achieve the extra performance you a looking for without incurring those extra losses.

 

[patpatbut]

Thanks. Have you tried q100 36v 328rpm compared with other swx motors?

Pat

 

[shemozzle999]

Thanks. Have you tried q100 36v 328rpm compared with other swx motors?

Pat

Sorry, no Pat, I have not worked with the q100 motor.

 

[patpatbut]

That's ok. Actually, I am quite surprised no one has tried q100 on brompton. I thought it is another choice instead of Tongxi motor.

Pat

 

[superDove]

Rather than having a custom front fork, you better extend the rear dropout to put a strong motor in it.

Saw this rear motor conversion on youtube today. The only one I've seen around apart from yours Cwah.
You lose the gearing though right? Unless you use schlumpf or something like that?

Falco at Orbital Cycling Festival 2013 - YouTube

 

[patpatbut]

Sorry, no Pat, I have not worked with the q100 motor.

slightly off topic, I remember you ordered two SWXU either with 24v or 36v. Do you know the difference between them?

Pat

 

[cwah]

Saw this rear motor conversion on youtube today. The only one I've seen around apart from yours Cwah.
You lose the gearing though right? Unless you use schlumpf or something like that?

Falco at Orbital Cycling Festival 2013 - YouTube

Yeah you loose the gearing. Although it doesn't matter much for me as I use motor assist 99% of the time

 

[aetos2000]

Like this

Everything controller and battery is in my bag connected via an umbilical chord to the motor and throttle which are just on the bike

Umbilical parks on a dummy connector on the bike when not in use.

This DIY thread details the whole build from a bare motor wheel build to building a small battery from single power drill cells.

PS doing it yourself as you say does have the advantage of being able to fix it your self and you can buy two of everything as spares and still have a lot of money left over compared to buying a kit.

Regards

Jerry

Like this

Everything controller and battery is in my bag connected via an umbilical chord to the motor and throttle which are just on the bike

Umbilical parks on a dummy connector on the bike when not in use.

This DIY thread details the whole build from a bare motor wheel build to building a small battery from single power drill cells.

PS doing it yourself as you say does have the advantage of being able to fix it your self and you can buy two of everything as spares and still have a lot of money left over compared to buying a kit.

Regards

Jerry

Smart fast connector Jerry ,any info about that ? Is DIY?

 

[Cyclezee]

Saw this rear motor conversion on youtube today. The only one I've seen around apart from yours Cwah.
You lose the gearing though right? Unless you use schlumpf or something like that?

Falco at Orbital Cycling Festival 2013 - YouTube

Falco also now have a front motor conversion for the Brompton, but modified forks with stronger forks are required. eZee will also have Brompton conversion coming later this year.

 

[Tim]

John, I'm very close to buying a customer's Brompton (he bought a Sahel Compact to replace one of his pair of Bromptons so we've ended up with a barely-used white 3-speed which we'll either sell for him or make use of...), I'd like to hear about the eZee conversion, that sounds very interesting to me right now!

 

[Cyclezee]

John, I'm very close to buying a customer's Brompton (he bought a Sahel Compact to replace one of his pair of Bromptons so we've ended up with a barely-used white 3-speed which we'll either sell for him or make use of...), I'd like to hear about the eZee conversion, that sounds very interesting to me right now!

Hi Tim,
eZee have been planning the Brompton conversion for a long time, but I think it will be several months before the conversion is available.
I'm sure that you would be able to sell the Brompton as it stands without to much difficulty.
They will have it at interbike this year, with some new models.

 

[Tim]

I heard about another one today, a dealer from the States visited (bearing some bad news about a big electric bike figure out in NYC) and he mentioned a Brompton conversion they were working on too, something they were developing in-house in Colorado, but he didn't give up any specifics.

What's the latest with Brompton's own efforts, I wonder?

 

[jerrysimon]

All quiet still from Brompton. Don't hold your breadth.

Jerry

 

[pdarnett]

That's a Bulgin connector, used to be for Disco lighting, multi pin high amps.

http://www.bulgin.co.uk/Products/GenPurpose_Connectors/GenPurpose_Connectors.html

 

[jerrysimon]

Sure is

Only rated at 6A/pin so ensure your motor phase wires don't exceed that. Of course with the Tongxin and Keyde motors its not a problem.

Jerry

 

[aetos2000]

Sure is

Only rated at 6A/pin so ensure your motor phase wires don't exceed that. Of course with the Tongxin and Keyde motors its not a problem.

Jerry

I want more pins and I'm thinking about http://www.ebay.ca/itm/AC-400V-12A-12-Pins-Electric-Deck-Circular-Aviation-Connector-Plug-/181303676177?pt=AU_B_I_Electrical_Test_Equipment&hash=item2a368a8d11&_uhb=1

 

[shemozzle999]

Alternative means of mounting battery using plastic coated jubilee clips held in place with tyraps to lower section