Search found 3143 matches

by zombiess
Oct 17, 2017 11:00 pm
Forum: Motor Technology
Topic: Micro Lebowski Controller - DIY 3kw
Replies: 496
Views: 30915

Re: Micro Lebowski Controller - DIY 3kw

No leboski your numbers are overly optimistic. Truth is you forgot the sag... Likely a 100v battery will sag to 90v under load. Also you will never get a 100v fet to survive at its limits with a 100v battery. The numbers for this would be 84v absolute max fully charged and that will sag to ~75v und...
by zombiess
Aug 24, 2017 10:15 pm
Forum: Motor Technology
Topic: GaN Mosfet --- Arlo?
Replies: 9
Views: 349

Re: GaN Mosfet --- Arlo?

They turn on and off with RF level speeds. This sounds like a nice idea, but makes them a bit of a challenge to control in practice. I went to an IEEE presentation on High Electron Mobility Transistors (GaN) devices a while back. After the presentation I was speaking with one of the people that doe...
by zombiess
Aug 24, 2017 9:49 pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38570

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp

The inertia run issue was most likely due to the dyno control loop and the your motor drive control loop finding an unfortunate resonance with each other. I wouldn't be surprised if your motor drive can respond much faster to load changes than a dyno typically used for ICE cars (it might not have en...
by zombiess
Jul 11, 2017 3:05 pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38570

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp

Are you on bias play tires "slicks" or radials? Curious as a drag radial would also give you a little more MPH. Traction is all about suspension setup, read up on what the fast FWD guys are doing and adapt it to your setup.
by zombiess
Jul 11, 2017 12:31 am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38570

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp

When you get your 60's down the MPH will come up as well since they are really bad right now. It has really good MPH already which is what really shows the power (i've seen several 13 sec 130MPH passes on Supra's and Civics).

Congrats!
by zombiess
Apr 12, 2017 3:24 pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38570

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

Had to convert the part of the chip dealing with impedances to floating point (hand-made floating point as the chip has no hardware floating point). So far it has added 1200 lines of (assembly) code, I expect to need another few 100. Rom is at 94% full now... Are you going to port the code to a pro...
by zombiess
Mar 20, 2017 3:39 pm
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 246
Views: 27048

Re: Sabvoton SVMC072150 controller review, variable regen *P

I have a modded 72150 sabvoton that has been unlocked to do 200A. I was wondering if there is a way to do slide regen and brake/button regan. that way I would have two levels of regen. One to slowly stop me and another the stop me much faster. P.S. aliexpress has my modded controller for $275. Tota...
by zombiess
Jan 13, 2017 11:16 am
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

How are you making the DC link capacitor connection to the copper bus and the power devices? I've always found this to be somewhat challenging. I have proper soldering tools that allow me to solder to thick copper bus, but this technique does not seem good for production. I'm interested to see what ...
by zombiess
Jan 10, 2017 4:52 pm
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

That is funny right there. I wonder if the marketing department reviewed the datasheet and modified a few things to improve sales. Reminds me of one of my favorite jokes: “Milk production at a dairy farm was low, so a farmer wrote to the local university to ask for help. A multidisciplinary team of ...
by zombiess
Jan 04, 2017 8:53 pm
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

marcos wrote: Vishay sells an equally magic 2512 6W* resistor.
* = 6W rating only valid on 0 ohm values :mrgreen:
by zombiess
Jan 03, 2017 9:55 am
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

Since resistor inductance and wattage are possible issues, why not place 3 in parallel? Populate them all so the inductance drops and wattage dissipation increases. I like the 2512 footprint myself for its large surface area (thermal management). Of course this depends on space available, but the bo...
by zombiess
Dec 26, 2016 10:51 pm
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

Lockout = preventing the adjacent side from tuning on if one side is active, i.e. when the high side is active, the low side is locked out from turning on. Not sure why you need the logic gates myself or how they would interfere with the differential signal, but personally I would leave the driver c...
by zombiess
Dec 26, 2016 1:44 am
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

Marcos, I believe the reason for the external circuitry is to address a fault before it occurs. It seems more relevant to a design that uses separate High/Low gate drives vs one that has them both integrated into a single chip that has a lockout type function. Highhopes also uses that input techniqu...
by zombiess
Dec 14, 2016 2:20 pm
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

not sure what you mean. we program for 21kHz instead of 20 kHz. or 18kHz instead of 20khz. 18, 21 .. both evenly divisible by 3. so your question is will the processor be stressed if it tries to generate a 21kHz frame rate as compared to a 20kHz. or 18khz as compared to 20khz. so here we are talkin...
by zombiess
Dec 13, 2016 12:03 am
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

HighHopes wrote: you mean 21kHz. keep the switching frequency as a value evenly divisible by 3 and this will magic out some harmonics
In order to do this, wouldn't the PWM need to be generated with 1Hz accuracy? That could be asking a lot from the controller.
by zombiess
Dec 10, 2016 12:57 pm
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

Oh, okay okay, I'll keep that in mind. Battery pack is not laid out yet. To avoid what Njay is referencing (great point Njay!) you must keep the batt to controller leads as short as possible (reduces stray L) minimize their loop area. Inductance + loop area = the enemy, at least from battery to con...
by zombiess
Nov 29, 2016 12:54 pm
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

I take back what I said about getting rid of the distributed caps, but I would most likely increase the capacitance by adding a +100uF cap directly to the input pads. I was looking for my notes when I experimented with DC link cap location but I must not have made them. I experimented with up to 3 a...
by zombiess
Nov 29, 2016 1:38 am
Forum: Motor Technology
Topic: OSHW TO247 IGBT watercooled laminated half-bridge
Replies: 124
Views: 7346

Re: OSHW TO247 IGBT watercooled laminated half-bridge

I'd forgo that cap arrangement and use a single large DC link polypropylene cap right on the input for each phase. I used 600uF Cornell Dublier caps in my parallel research setups because the plan is to go > 1kA on low inductance motors. They can handle 100A RMS ripple current each and there are 3 o...
by zombiess
Sep 19, 2016 5:42 pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38570

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

It konks out at 60mph.... so with a good run once lebowski changes the code it should be capable of low 5s and with more battery avalible mid 4s then with better tires into the 3s!!! Anything < 4.5s 0-60MPH is quite difficult in FWD on the street with an unprepared surface. Once you can get it to a...
by zombiess
Sep 19, 2016 5:32 pm
Forum: Items for Sale - New
Topic: DNM USD-180 dual disc brake fork $299
Replies: 4
Views: 1044

Re: DNM USD-180 dual disc brake fork $299

Been sold, only have a slightly used USD-180 left.
by zombiess
Sep 14, 2016 12:44 am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38570

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

Look into Nitto 555R, NT 05, BFG Drag radials, Mickey Thomson Street Radials and Hoosier drag radials just to name a few. I've personally run all of these at some point, on the street and on the track. More sidewall will help it hook better due to absorbing shock so you might want to run the stock r...
by zombiess
Sep 13, 2016 6:25 pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 506
Views: 38570

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

Great job cleaning up the body damage. Car looks so much better now and has a superior motor to the one it came with :)
by zombiess
Sep 13, 2016 6:19 pm
Forum: Motor Technology
Topic: My DIY FOC controller spinning a Zero Motorcycles motor
Replies: 4
Views: 456

Re: My DIY FOC controller spinning a Zero Motorcycles motor

Nice! Is it starting without sensors? Yes, this is sensorless. The startup can be a little jerky at times, but from what I've read on TI's boards this is minimized once the motor is under load and things are properly setup. Instapsin claims full torque startup ability. As you can tell from the vide...
by zombiess
Sep 12, 2016 12:47 am
Forum: Motor Technology
Topic: My DIY FOC controller spinning a Zero Motorcycles motor
Replies: 4
Views: 456

My DIY FOC controller spinning a Zero Motorcycles motor

Decided to get down to business today and figure out the last few bugs stopping my FOC controller from working. This is just a prototype, but I'm trying to develop this into a product. Next up is testing on my motor dyno with some other larger motors I have connected shaft to shaft.