Search found 1314 matches

by Jozzer
Jun 07, 2016 5:43 am
Forum: Motor Technology
Topic: 75-5 & 75-7 Motors - Looking for Test Engineers
Replies: 55
Views: 4607

Re: 75-5 & 75-7 Motors - Looking for Test Engineers

My Ducati is waiting for a new motor ;) ...
by Jozzer
Dec 18, 2015 6:13 pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: how to program a sevcon gen4
Replies: 175
Views: 40922

Re: how to program a sevcon gen4

Good work Arlo.
Interesting you mention grounding problems resulting in encoder faults, it might explain some of the problems I've been having.
by Jozzer
Nov 10, 2015 9:49 am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1022
Views: 125921

Re: Compact Field Oriented Controller, ASI + Grin, limited r

Yes indeed - well worthwhile considering it turns regen braking from a bit of a gimmick to a useable brake system IMO.
With a feature like this it becomes viable to have a variable regen setup linked to the physical brakes too..
by Jozzer
Nov 07, 2015 11:28 am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1022
Views: 125921

Re: Compact Field Oriented Controller, ASI + Grin, limited r

Robbie here has been (somewhat recklessly I dare say!) running with only regen and no mechanical brakes on his commuter bike How does this work? I thought that the BEMF at low speed was too weak to allow enough braking torque to bring the bike to a stop. Does this controller actively supply current...
by Jozzer
Oct 24, 2015 6:34 am
Forum: E-Bike General Discussion
Topic: Agni 111rdr
Replies: 10
Views: 639

Re: Agni 111rdr

Batteries - depends how well you understand the risks - but assuming you need a small light pack, Lipoly is probably best/easiest/cheapest.
Bike - lightweight and with easy battery storage space, and with an easy clean driveline to fit motor/chain/large sprockets.
by Jozzer
Oct 23, 2015 3:00 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Revolt new motor RV 160 Pro
Replies: 88
Views: 14771

Re: Revolt new motor RV 160 Pro

Hi Miles, all good here thanks, I'm always happy when playing with a dyno, especially when it starts to get cold outside! Hope you're well and happy. We must catch up soon.. Do you want no load current measured motorside or batteryside? My RCL meter said that phase to phase resistance was 8 Ohms - I...
by Jozzer
Oct 23, 2015 5:29 am
Forum: E-Bike Non-hub Motor Drives
Topic: Revolt new motor RV 160 Pro
Replies: 88
Views: 14771

Re: Revolt new motor RV 160 Pro

I was told - "The KT of he 45KV motor is about 30(oz-in/amp)."

I've got one here for testing (53kv), it might take me a couple of weeks to get my dyno set up properly (and dial in the Sevcon controller) but I'll post some results when I can..

-Steve
by Jozzer
Oct 20, 2015 4:46 am
Forum: E-Bike General Discussion
Topic: Agni 111rdr
Replies: 10
Views: 639

Re: Agni 111rdr

Simulator won't work for Agni motors ;)
But yes - 60RPM per volt, 400A max, 220A continuous. Max temp at brushholder sensor 100C.
by Jozzer
Oct 15, 2015 6:54 am
Forum: E-Bike General Discussion
Topic: Agni 111rdr
Replies: 10
Views: 639

Re: Agni 111rdr

According to Justins simulator, 10kW would get you 70MPH - so a 5kW/h pack to do it for half an hour. And, 600A would melt your brushes in 3 seconds, continuous current is more like 220A. My advice, is if you want to use this much power and travel at these speeds - then convert a motorcycle not a pu...
by Jozzer
Oct 13, 2015 7:20 am
Forum: E-Bike General Discussion
Topic: Agni 111rdr
Replies: 10
Views: 639

Re: Agni 111rdr

The 111RDR makes 60RPM/V, and can safely run at 6000RPM max - so something close to a 100V battery pack is required to hit full power. You'd certainly reach 75mph on a mongoose frame - though traction/wheelies would be a problem in something that light!
by Jozzer
Oct 03, 2015 9:05 am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1022
Views: 125921

Re: Compact Field Oriented Controller, ASI + Grin, limited r

I'm not sure if you'll ever get sensorless mode to run on a geared hubmotor, though I confess I haven't tried very hard..
by Jozzer
Oct 03, 2015 4:40 am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1022
Views: 125921

Re: Compact Field Oriented Controller, ASI + Grin, limited r

Are you following procedures from this manual? http://www.ebikes.ca/downloads/BAC500_Controller_Manual_Rev%201.0.pdf Particularly page 42/43? Do you have it set to run on sensors - not the default setting to start with sensors then go to sensorless once the motor spins up? Are you saving the setting...
by Jozzer
Sep 28, 2015 10:19 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Register bicycle as moped?
Replies: 14
Views: 980

Re: Register bicycle as moped?

I've got a couple of customers in UK with road legal bikes - but it most definitely is NOT the same in all EU countries - where exactly are you based?
by Jozzer
Sep 23, 2015 11:32 am
Forum: Battery Technology
Topic: Potting Batteries, Thoughts and Experiments
Replies: 127
Views: 14637

Re: Potting Batteries, Thoughts and Experiments

Interesting experiments Justin. I bet that garage still smells bad now? :D Several years ago I potted a small pack of A123 M1 cells so they could be inserted into the frame of a trike - I've used the pack sporadically ever since with no problems (just cells potted with BMS pigtails and power cables ...
by Jozzer
Sep 14, 2015 4:28 am
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1022
Views: 125921

Re: Compact Field Oriented Controller, ASI + Grin, limited r

I believe the large gauge red and black wires are actually for a charger connection, so that charge current is "counted" by the CA..
by Jozzer
May 05, 2015 3:34 am
Forum: Large EV General Discussion
Topic: Electric Miata/MX5.
Replies: 61
Views: 11912

Re: Electric Miata/MX5.

Yup charged to 4.2V, most often discharged less than 75% though a few full cycles. Probably around 180 cycles in the 9000 miles it did. Daily use at 14C, 1000A of torque was hard to resist :twisted:
by Jozzer
Apr 22, 2015 3:20 am
Forum: Motor Technology
Topic: Agni motor tuning and racing
Replies: 123
Views: 18766

Re: Agni motor tuning and racing

Some people are better at holding Agni's together than others ;)

Agni's are fine and reliable inside their rated power range, the problems start when people push them to double that and still expect them to be reliable - just like most other motors we use and abuse in our EV's..
by Jozzer
Apr 06, 2015 4:55 am
Forum: Large EV General Discussion
Topic: Electric Miata/MX5.
Replies: 61
Views: 11912

Re: Electric Miata/MX5.

The car performed great - just I have limited use for a 300HP+ car that can only fit 2 people. I also moved home and business - so decided to free up the resources and build a bigger car next year! I have as much fun building EV's as I do using them, so it wasn't a huge loss.. Sorry no video, we did...
by Jozzer
Mar 29, 2015 4:26 am
Forum: Motor Technology
Topic: Agni motor tuning and racing
Replies: 123
Views: 18766

Re: Agni motor tuning and racing

I've dyno'd both brushholders (the other one is made by LMC), and I got more or less equal power from both, BUT with significantly more arcing from the LMC holder. THe thick wedge shape means that timing is not as precise, and the trailing edge makes lots of fireworks. I destroyed 2 sets of their br...
by Jozzer
Mar 29, 2015 4:20 am
Forum: Large EV General Discussion
Topic: Electric Miata/MX5.
Replies: 61
Views: 11912

Re: Electric Miata/MX5.

The car was dismantled last summer and parts sold - but all the Lipo live on. Some was refitted to another electric car (the owner had killed half his pack by overcharging it with a homemade charger!), the rest is boxed up here to be refitted to one of my motorcycles later this year.. Motor and cont...
by Jozzer
Oct 26, 2013 6:14 am
Forum: Items for Sale - Used
Topic: methods *trying* to liquidate my holdings
Replies: 137
Views: 12576

Re: methods *trying* to liquidate my holdings

We had a customer asking for magnets recently - not sure if it was you?
We passed them back to Croatia and they were told they could get some in a month - if that helps at all!
by Jozzer
Oct 25, 2013 8:00 am
Forum: Items for Sale - Used
Topic: methods *trying* to liquidate my holdings
Replies: 137
Views: 12576

Re: methods *trying* to liquidate my holdings

"Jozzer - I owe him for the rest of my life" Not true my friend, our collaboration has been a 2 way street, and I thank you for all the amazing things you've done for me over the years. You are one of a kind, and I've enjoyed working with you above all others! Long Live Methods - Prince of the Elect...
by Jozzer
Jul 15, 2013 2:43 pm
Forum: Motor Technology
Topic: Agni motor tuning and racing
Replies: 123
Views: 18766

Re: Agni motor tuning and racing

Hope that brush set arrived OK for you doc! We've just got our first of the new 155r motors in - 230mm diameter, 18kg, 135mm wide - the BIG Agni is here at last! Hello Jozzer, Thanks The brush arrived fine last week. I have confirmed that to Leslie. :wink: Lol - she always say's I don't talk to her...
by Jozzer
Jul 15, 2013 2:36 pm
Forum: Motor Technology
Topic: Agni motor tuning and racing
Replies: 123
Views: 18766

Re: Agni motor tuning and racing

I'll get on it this week Luke/Brock - the motor's just arrived and I'm not at the workshop for a couple of days. I've not been in the loop on testing/development of this motor particularly, but the early prototypes were very promising. One of these fatties on the back end/load of my dyno easily outl...
by Jozzer
Jul 15, 2013 1:43 pm
Forum: Motor Technology
Topic: Agni motor tuning and racing
Replies: 123
Views: 18766

Re: Agni motor tuning and racing

Hope that brush set arrived OK for you doc!

We've just got our first of the new 155r motors in - 230mm diameter, 18kg, 135mm wide - the BIG Agni is here at last!