Search found 1850 matches

by hillzofvalp
Dec 06 2018 1:21am
Forum: Motor Technology
Topic: 4x less coasting resistance
Replies: 21
Views: 727

Re: 4x less coasting resistance

My skateboard motor has a halbach. It's not practical to assemble, and I don't know how it will hold up on the road. Still working on the 1S motor but it takes $$ to develop crazy things
by hillzofvalp
Apr 04 2018 11:08pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2070
Views: 320957

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

Very good work guys. I have an esk8 motor I call Trillium.. it has sort of dragged on. Perfectionism kills. I'll be sending it to Justin for review... has 6063 rotor and has been extruded.
by hillzofvalp
Aug 12 2017 1:34am
Forum: Items for Sale - Used
Topic: Kelly KBL96251 (2 available) $299 each SOLD
Replies: 7
Views: 624

Re: Kelly KBL96251 (2 available) $299 each

grrga wrote:
hillzofvalp wrote: are you still interested?
Yes.
Will it get lost in the mail if I ship it to croatia
by hillzofvalp
Aug 10 2017 2:20am
Forum: Items for Sale - Used
Topic: Kelly KBL96251 (2 available) $299 each SOLD
Replies: 7
Views: 624

Re: Kelly KBL96251 (2 available) $299 each

grrga wrote:Im interested in the controller, can you please check what the shipping price is for Croatia.
are you still interested?
by hillzofvalp
Aug 10 2017 2:18am
Forum: Items for Sale - Used
Topic: Kelly KBL96251 (2 available) $299 each SOLD
Replies: 7
Views: 624

Re: Kelly KBL96251 (2 available) $299 each

johnnyz wrote:
hillzofvalp wrote:Pulled from working bike.. <500 miles. All you might need is new J1/J2 male connector from kelly (cheap/free)
Can this take a 24s Li-Ion pack (charged to total voltage of about 98 volts settling on about 97 or so


John
YES. I ran 100V off the charger.
by hillzofvalp
Jul 14 2017 2:49am
Forum: Items for Sale - Used
Topic: Kelly KBL96251 (2 available) $299 each SOLD
Replies: 7
Views: 624

Kelly KBL96251 (2 available) $299 each SOLD

Pulled from working bike.. <500 miles. All you might need is new J1/J2 male connector from kelly (cheap/free)
by hillzofvalp
Mar 17 2017 7:45pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 528
Views: 64687

Re: Hi power high voltage inverter build for nissan leaf mot

Luke, you would ditch all Leaf systems in doing that right...? Including the bms which I think limits to around 275A? I want to do the same it just sounds like a huge PITA. Please try! :wink:
by hillzofvalp
Feb 05 2017 10:37pm
Forum: E-Bike Technical
Topic: Make a watercooled high kw motor and I'll buy it !
Replies: 89
Views: 7767

Re: Make a watercooled high kw motor and I'll buy it !

Jestronix, you're asking for the wrong thing. The best way to deal with heat is to not make it to begin with. That means a more efficient motor. People jump thru ridiculous hoops to make crap motors disperse heat better, when for the same price they could have had hubmotors to run at up to 10-15kw ...
by hillzofvalp
Jan 15 2017 4:36am
Forum: Items for Sale - New
Topic: Hubmonster 94% efficient 7kw rated $587
Replies: 421
Views: 60257

Re: Hubmonster 94% efficient 7kw rated $587

In that size i highly doubt anyone else is winding them six phase like that.
by hillzofvalp
Jan 15 2017 2:34am
Forum: Items for Sale - New
Topic: Hubmonster 94% efficient 7kw rated $587
Replies: 421
Views: 60257

Re: Hubmonster 94% efficient 7kw rated $587

I have two.. waiting for the right moment to combine them and rewind...
by hillzofvalp
Jan 02 2017 12:54am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 528
Views: 64687

Re: Hi power high voltage inverter build for nissan leaf mot

Adding a separate contactor controlled externally for the purposes of driving a second controller to the motor still not worth it? It might disable the motor controller if the bms detects loss of energy, but I can't imagine it would brick anything. It would only suck if it locked the steering or tur...
by hillzofvalp
Dec 31 2016 11:27pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 528
Views: 64687

Re: Hi power high voltage inverter build for nissan leaf mot

I bumped into a guy a while back who claimed to have smuggled in a Nissan programmer (the laptop) and the nismo ecu etc.. said he sold it for a pretty penny stateside. Said the buyer asked complete anonymity. Wonder what the hell that guy is up to.
by hillzofvalp
Dec 31 2016 4:06pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 528
Views: 64687

Re: Hi power high voltage inverter build for nissan leaf mot

What does it take to modify the oem controller? Are you talking about a firmware rewrite?

Maybe it would be easier to remove most of the car and canbus
by hillzofvalp
Dec 31 2016 4:46am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 528
Views: 64687

Re: Hi power high voltage inverter build for nissan leaf mot

Speaking of production...

when will you offer kits so I can put on of these in my leaf with fresh 2016 pack? I'm sure it will still be fun with a stock leaf pack... not quite as fun as 470V with 150C pack, but probably still 300% improvement.
by hillzofvalp
Dec 14 2016 4:02am
Forum: Motor Technology
Topic: Outrunner Stators with no tooth tips.. cons?
Replies: 1
Views: 408

Outrunner Stators with no tooth tips.. cons?

I'm quickly learning how hard it is to wind high slot count, small diameter count outrunner motors. The easiest way to wind I think would be to hand or machine wind a single tooth on a separate mold, and then slide the winding onto the stator. The problem with this is that for it to be a tight windi...
by hillzofvalp
Dec 08 2016 6:51pm
Forum: Motor Technology
Topic: FEMM Help needed
Replies: 7
Views: 639

Re: FEMM Help needed

I can't get my torque ripple below 12.5%. I'm also unsure if I should bother trying to skew the stator half a tooth. If you post your simulation here, we can make suggestions. I got torque ripple at nominal torque down to 0.3% when simulating my design. There are a lot of factors.... Anyway, low to...
by hillzofvalp
Dec 07 2016 4:32am
Forum: Motor Technology
Topic: FEMM Help needed
Replies: 7
Views: 639

Re: FEMM Help needed

Well, it depends what you are trying to do but generally you will group the entire rotor into one group. Then you can select the group and then go up to "Rotate" under the Edit menu. The angle you need to rotate it for each step is going to depend on a number of things (number of poles, number of s...
by hillzofvalp
Dec 07 2016 4:30am
Forum: Motor Technology
Topic: FEMM Help needed
Replies: 7
Views: 639

Re: FEMM Help needed

I've only used FEMM for magnetic circuits. Now I do all of my motor design in Emetor. Unless your design requires an IPM rotor, I'd recommend you try it. https://www.emetor.com/ That's what I've been using.. over 200 simulations.. I can't get my torque ripple below 12.5%. I'm also unsure if I shoul...
by hillzofvalp
Dec 01 2016 6:18pm
Forum: Motor Technology
Topic: FEMM Help needed
Replies: 7
Views: 639

FEMM Help needed

I can do basics of motor model in FEMM with no scripts or add ons. I'd like to simplify the workflow and get a motor spinning in FEMM. If anyone can show me or teach me how it'd be nice... OR perhaps do final analysis on my motor for me.. even better. Farfle is busy. I heard miles may be able to hel...
by hillzofvalp
Aug 04 2016 3:46pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2070
Views: 320957

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

Yeah. Well I'm not sure if it makes sense even though the guys research said it was.. because yes covering it up decreases loss, but covering it up also reduces thermal bridge to copper, so now all of a sudden you could be decreasing overall system efficiency.. Regardless, this topic probably accoun...
by hillzofvalp
Aug 02 2016 8:01pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2070
Views: 320957

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

Small 40mm ID... 3000 rpm. 3000 rpm with a larger hub is going to be way worse. You'll have to do the math but I'm guessing something closer to 1000rpm in a large 200-300mm hub are the same forces that I'm seeing
by hillzofvalp
Aug 02 2016 5:13pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2070
Views: 320957

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

I think the drag is offset by reduced losses elsewhere.. You could do it but you'd need to do a custom ebike motor or heavily modified. I think partial fill sealed is better bang for buck.. And refill every so often and deal with the mess every so often. But I also think there is an ideal ferrofluid...
by hillzofvalp
Aug 02 2016 1:15pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2070
Views: 320957

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

I'm not sure that's 100% accurate. You would need a pretty heavy drip and large pool to get it down the cover, and act of God to get it back over the magnet spacer. Problem with my motor is that even if that were true, in order for it to "run down" by gravity, it has to run down a spinning rubber se...