Exiting New Things

This arrived today. It could be the most exiting thing we've seen on the forum, or it could turn out to be a damp squib, or anything in between. I'm busy now, but I'll give more info later, and hopefully a test at the Weekend:

http://i451.photobucket.com/albums/qq236/d8veh/XD%20motor/20140324_1038071_zpsbaa13599.jpg

Any details about this setup? I am sure I have seen this motor around here before

Pat

Edited March 24, 201412 yr by trex

the xiongda XD (strictly legal, not like badged BPMs) has two internal gears, the higher ratio (8) for climbing hills, the lower ratio (4) for flat roads. Maximum power output is about 500W.Very effective at climbing 10% hills and ideal for light assist.

A rocker switch lets you select low or high gear, or automatic, the controller then decides when.

the supplied controller is rather conservative, rated 15A.

I would like to see it tested with a 20A or 25A sensored controller.

I hope the testing goes well d8veh, could be the equivalent mid motor/hub motor answer for the future EU 250W motor solution.

Itching to see the internal workings and if it will reveal the secrets of how they have achieved this:)

could be the equivalent mid motor/hub motor answer for the future EU 250W motor solution.

A mid motor doesn't doesn't need two gears does it ?

A mid motor doesn't doesn't need two gears does it ?

No, but it's got the use of all the bike gears. That's not ideal though, sometimes compromising either the rider or motor efficiency.

A legal motor only needs two gears to adequately cover the range of speeds with enough power for all purposes, but riders need far more gears for efficiency in very variable terrain.

If successful, this two speed hub is an optimal solution, a concept I was promoting for e-bikes years ago.

I hope the testing goes well d8veh, could be the equivalent mid motor/hub motor answer for the future EU 250W motor solution.

 

Itching to see the internal workings and if it will reveal the secrets of how they have achieved this:)

I thought you already have worked this out in one of your previous posts, by switching the rotational direction of the motor.

Still, none of the motor listed on ebike.ca simulator can go up 10% hill at 15mph.

If xiongda is willing to supply 20A controller with their XD motor then it should be the first to do this.

I wish it works well on you Dave.

I am quite surprised they do not have a CST one....

Pat

[quote="trex, post: 212134, member: 5652"

Still, none of the motor listed on ebike.ca simulator can go up 10% hill at 15mph.

If xiongda is willing to supply 20A controller with their XD motor then it should be the first to do this.

Edited March 24, 201412 yr by hoppy

100kgs, 10% hill, 25.5km per hour (15mph) requires 880W at the wheels.

The input power (required of the battery) is = 880W / divided by the yield

If you run the motor at 80% efficiency: 1,100W or 40A @ 37V

That XD motor may do it.

Sorry to raise such a question when you are pushing the boundaries of pedelec tech

.,,,,,,but may I ask how much ?

100kgs, 10% hill, 25.5km per hour (15mph) requires 880W at the wheels.

The input power (required of the battery) is = 880W / divided by the yield

If you run the motor at 80% efficiency: 1,100W or 40A @ 37V

That XD motor may do it.

40A with 20A controller?

yes, that seems quite impossible but I reckon d8veh has ways of pushing motors to their limits

The supplied controller has only 6 FETs, xiongda pushed it up to 500W output power, but I reckon with a KU123, it will go much farther. The question is, the KU123 can only moves the motor forward, the ratio could be 4 or 8. I hope it's going to be 8 then that XD motor will fly up ladders..

40A is the draw from the battery, power output needs to reach 880W to hit the 15mph on 10% gradient.

If I remember correctly, I was told last July(?) that the supplied KT controller will work at 48V.

Edited March 24, 201412 yr by trex

yes, that seems quite impossible but I reckon d8veh has ways of pushing motors to their limits

The supplied controller has only 6 FETs, xiongda pushed it up to 500W output power, but I reckon with a KU123, it will go much farther. The question is, the KU123 can only moves the motor forward, the ratio could be 4 or 8. I hope it's going to be 8 then that XD motor will fly up ladders..

40A is the draw from the battery, power output needs to reach 880W to hit the 15mph on 10% gradient.

If I remember correctly, I was told last July(?) that the supplied KT controller will work at 48V.

Interesting! Do we know the rpm of that motor?15mph up 10% is the holy grail of legal ebikes!

there is a motor test report on this web page:

http://xiongdamotor.en.alibaba.com/custom_page_1/New_Double_speed_Motor.html

test 59 shows the best you can get with the 15A controller.

ebike.ca shows about 17km per hour on 10% and 100kgs.

The Ezee motor gives 15km/h under the same conditions.

Sorry to raise such a question when you are pushing the boundaries of pedelec tech

 

.,,,,,,but may I ask how much ?

from previous thread:

http://pedelecs.co.uk/forum/threads/dual-speed-motor.16634/#post-204749

alibaba link:

http://xiongdamotor.en.alibaba.com/productgrouplist-220560510/NEW_Double_speed_Motor.html

Aaaah... I wanted to buy it but didn't because I'd use too much power...

But just tell me it has more torque than the BPM and I'll buy 2 of them for a nice dual drive at 3KW

the xiongda XD (strictly legal, not like badged BPMs) has two internal gears, the higher ratio (8) for climbing hills, the lower ratio (4) for flat roads. Maximum power output is about 500W.Very effective at climbing 10% hills and ideal for light assist.

A rocker switch lets you select low or high gear, or automatic, the controller then decides when.

the supplied controller is rather conservative, rated 15A.

I would like to see it tested with a 20A or 25A sensored controller.

A curious though wimpy hub motor for those more concerned with their assets than their freedom, what point then in upping the amps and going illegitimate.?

Slightly off topic.

I just found out my SWXB clone is from Xiongda. Of course it is not double speed version but it is still running fine.

Pat

100kgs, 10% hill, 25.5km per hour (15mph) requires 880W at the wheels.

The input power (required of the battery) is = 880W / divided by the yield

If you run the motor at 80% efficiency: 1,100W or 40A @ 37V

That XD motor may do it.

A normal motor that can do 15mph with 500w will just create heat when it meets a 10% hill and it'll stall out. This motor can change down a gear to go up the hill and will run efficiently instead of creating heat but still only use 500w - the speed will drop to 8mph or so though. Then when it gets flat again the gears will change up and that 500w will now be used to propel the bike at 15mph.

Just think of it like a normal bike with a normal rider - you don't put out more power when going up a hill - you just change down a gear and go slower, even though your power remains the same. When you get to the flat, you change up and you go faster - even though your power remains the same.

A curious though wimpy hub motor for those more concerned with their assets than their freedom, what point then in upping the amps and going illegitimate.?

It's not illegitimate to increase the current to a motor. There's no legal limit to the current as long as it's safe and the motor's rated at 250w.