Search found 688 matches

by kdog
Mar 23 2014 5:41am
Forum: EBike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2103
Views: 420050

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Irrespective of the test results, I think your point (cd) is the killer for air vs oil for me. Not too keen on dirt crudding up my stator and shorting it. Two holes one bolt a splash of lube and I'm done. Well you know what I mean!
by kdog
Mar 23 2014 5:19am
Forum: EBike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2103
Views: 420050

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Thanks Madmax- the INOX sounds good (1yr nothing eaten) I def like the simplicity of oil and keepIng the motor sealed. I commute on dirt roads and a fine spray of dirt gets every where so air vents= ingress. Also for me the benefit is in reducing the peaks as Im not doing long extended climbs more s...
by kdog
Mar 22 2014 10:15pm
Forum: EBike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2103
Views: 420050

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Are there oils that should or should not be used for hub cooling? apparently some mineral oils can attack plastics paints etc. that would be bad for insulation seals etc. im leaning towards adding some oil to my 9c- dont know if this is an issue...
by kdog
Mar 16 2014 11:34pm
Forum: Motor Technology
Topic: Malfunctioning 9c controller?
Replies: 3
Views: 425

Re: Malfunctioning 9c controller?

Up until now the ebrake cut power permanently until reintroduced by the throttle.
I guess it's the change in function thats strange...
by kdog
Mar 16 2014 11:00pm
Forum: Motor Technology
Topic: Malfunctioning 9c controller?
Replies: 3
Views: 425

Malfunctioning 9c controller?

Has anyone experienced this before, any ideas on how to correct it? I have a 9c controller/hub motor setup. Works great but just recently the e-brake won't cut out the cruise control. What happens is once cruise control is initiated, using the e-brake cuts power whilst squeezed, but when I let go po...
by kdog
Mar 11 2014 5:55am
Forum: Battery Technology
Topic: Lifepo4 bms robustness?
Replies: 6
Views: 557

Re: Lifepo4 bms robustness?

Cheers for the tips
Haven't thrown it out! Haven't tested it yet but I will do.
by kdog
Mar 11 2014 5:24am
Forum: Battery Technology
Topic: Lifepo4 bms robustness?
Replies: 6
Views: 557

Re: Lifepo4 bms robustness?

Oh I'm pretty sure the current path was between the controller and battery, so back through the controller and also directly to the battery. (just the way it was wired up to provide power to relays independent of controller)
Kdog
by kdog
Mar 11 2014 5:20am
Forum: Battery Technology
Topic: Lifepo4 bms robustness?
Replies: 6
Views: 557

Re: Lifepo4 bms robustness?

As far as I understand, turning off the coil in a relay causes a Bemf spike, which is why it has an internal resistor built in, to provide a current path. Otherwise I would have protected it with a diode. Now in my haste to get it going I neglected that it was a 24v coil and sent 50v through it. I a...
by kdog
Mar 10 2014 9:21pm
Forum: Battery Technology
Topic: Lifepo4 bms robustness?
Replies: 6
Views: 557

Lifepo4 bms robustness?

Hi all Does anyone know how susceptible a Lifepo BMS is to voltage spikes coming back from the controller side. The reason I ask is I have a Mountainboard that has a 24v brushed motor/controller set up with some automotive relays to switch between power and braking circuits. Has worked great for 6 m...
by kdog
Mar 01 2014 6:46am
Forum: Battery Technology
Topic: The most ideal BMS for LiFePO4
Replies: 5
Views: 835

Re: The most ideal BMS for LiFePO4

For a BMS wiring diagram google in images 'bms wiring diagram', flick through till you find some of the pictures of actual BMS's with drawings overlaid. you'll find one very similar to your own i reckon. very handy to keep referring to... they're not to hard once you've got the hang of it. double ch...
by kdog
Mar 01 2014 6:25am
Forum: EBike Reviews & Testing
Topic: Battery-matrix vendor review
Replies: 9
Views: 2967

Re: Battery-matrix vendor review

so my last email efforts fell silent, and now it apears that the website no longer exists.
i guess that's the end of battery-matrix
kdog
by kdog
Feb 17 2014 6:39pm
Forum: EBike Reviews & Testing
Topic: Battery-matrix vendor review
Replies: 9
Views: 2967

Battery-matrix vendor review

Hi all I thought I'd share my 2 experiences with buying through battery-matrix.com, as ive seen a few post asking about this vendor and no answers. i was quite concerned about ordering though this company initially because i couldnt find any positive reviews- only one negative rant (cant remeber whe...
by kdog
Feb 12 2014 6:54am
Forum: Alternative Energy
Topic: using 2812 9c motor as a generator
Replies: 5
Views: 1790

Re: using 2812 9c motor as a generator

a motorbike PM alternator is a cheap alternative to a hub motor (unless you already have one). they also have robust 12v rectifiers that can rectify and regulate the output. you dont have use this though, then Vout is proportional to speed. the only thing is youll have to build a housing/mount. pick...