Search found 1865 matches

by hillzofvalp
Jan 02 2017 12:54am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 580
Views: 106360

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: 580
Views: 106360

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: 580
Views: 106360

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: 580
Views: 106360

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: 535

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: 1031

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: 1031

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: 1031

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: 1031

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: 2101
Views: 396345

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: 2101
Views: 396345

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: 2101
Views: 396345

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: 2101
Views: 396345

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...
by hillzofvalp
Aug 02 2016 6:49am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396345

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

Would love to hear what you guys think about my above posts ;) I know they are long? Do none of you know what exact fluids (specifically statorade A) have been tested so I have a reference? I'm talking to ferrotec today to try to get samples of better stuff. Re: thermal expansion of ring causing exp...
by hillzofvalp
Jul 31 2016 7:43pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396345

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

Well he has some business opportunity for that risk... As the die for that tool will cost <$3000 and the per unit cost likely <$2. $50 a set of 4-6 would be quite a nice little low-risk business. Happy to see it.

I'd like to share my findings on ferrofluid and skateboard hub motors soon.
by hillzofvalp
Jul 31 2016 4:37pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396345

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

I'm kind of surprised that over 15 years of ebike hub manufacturing have passed and yet this simple heatsink part hasn't been made until now.... It's kind of sad.
by hillzofvalp
Feb 29 2016 6:23pm
Forum: Battery Technology
Topic: Samsung 30Q INR18650-30Q 3000mah 15a cell
Replies: 244
Views: 49840

Re: Samsung 30Q INR18650-30Q 3000mah 15a cell

Anyone willing to cycle the HG2 at 2A charge, 7A discharge?
by hillzofvalp
Feb 09 2016 10:53am
Forum: Stand-up E-scooters and E-skateboards
Topic: Wireless Wii Nunchuck *TESTERS WANTED
Replies: 440
Views: 51064

Re: Wireless Wii Nunchuck *TESTERS WANTED

I'm going to launch an eboard product later this year. I am considering offering a hand remote as an optional feature to the standard foot control. If we can collaborate and optimize the board to plug into my main board as a daughter card, then I may be able to help bump up your volumes. I'm not sup...
by hillzofvalp
Feb 07 2016 7:16pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396345

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

Sounds like the seal by the bearing doing something weird... Maybe the interference fit gets worse when the metal expands..?