Search found 67 matches

by lizardmech
Feb 14 2019 1:31am
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 2041

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

There's also PM wire announced a few months ago as well, seems to be some sort of wire that can be pressed into shapes and selectively magnetized or something. https://www.designworldonline.com/pm-wire-magnet-manufacturing-technology-could-change-industries/ They didn't really explain a great deal i...
by lizardmech
Feb 02 2019 7:22pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 388
Views: 61604

Re: VESC-controller: Firmware released!

Take a look here for a basic picture http://mmc-manuals.ru/manuals/outlander_iii/online/Service_Manual_2013/img/54/ACC06200AB00ENG.pdf It is basically the same as the one used in the IMIEV Permanent magnet synchronous motor - see powertrain section https://en.wikipedia.org/wiki/Mitsubishi_i-MiEV#Po...
by lizardmech
Jan 31 2019 12:56pm
Forum: Motor Technology
Topic: Animation for High Torque ETM motor
Replies: 8
Views: 766

Re: Animation for High Torque ETM motor

Adding loads of poles just increases torque density but it restricts the maximum RPM the motor can run at. Losses in the stator become too extreme if you try to run this type of motor at higher speeds. You can squeeze a little more with thin laminations and special materials but there's only maybe 2...
by lizardmech
Jan 31 2019 12:33pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 388
Views: 61604

Re: VESC-controller: Firmware released!

As mentioned these controllers can be picked up really cheaply as they dont fail so no one needs them. They are well designed, have had millions spent on R&D and have components that are specifically chosen to do the job. The IGBTs are water cooled and everything is laid out logically. It could be ...
by lizardmech
Jan 30 2019 3:00am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 388
Views: 61604

Re: VESC-controller: Firmware released!

The NVIC will make sure the interrupts triggered while the ISR is being executed will be queued. That's a hardware feature. I tried the code and configured a "switching frequency" of 150kHz and apparently it works. My hardware won't like switching that fast so I didn't drive a motor, but everything...
by lizardmech
Jan 29 2019 9:18am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 388
Views: 61604

Re: VESC-controller: Firmware released!

Yeah, I looked at doing 100khz GaN VESCs a few times, at those frequencies you can eliminate the electrolytic caps and only have ceramic or ceramic + polymer caps. Those electrolytic caps contribute quite a bit to size and heat, you should also get some minor motor efficiency gains and possibly bett...
by lizardmech
Jan 29 2019 6:20am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 388
Views: 61604

Re: VESC-controller: Firmware released!

Did you decouple the ADC ISR from the PWM freq so PWM can be set to multiples of the ADC ISR?
by lizardmech
Jan 17 2019 11:27am
Forum: Motor Technology
Topic: DA-90 motor
Replies: 18
Views: 1860

Re: DA-90 motor

I couldn't find detailed motenergy efficiency graphs. I was looking at it compared to the 3kw golden motor axial flux motor. The DA-90 had almost 3x the peak torque at 0 RPM if you feed it enough current, at 4000 RPM the golden motor had lost over 50% of it's rated power and ceased producing torque ...
by lizardmech
Jan 17 2019 10:10am
Forum: Motor Technology
Topic: Esc current sensing
Replies: 18
Views: 838

Re: Esc current sensing

Thanks to all for replies and comments. I would like to jump back into the senseing. Instaspin foc requires phase voltage and phase current senseing plus a few others. Ina240 for inline current measurment and should i sense the phase voltage before or after the shunt resistor. Thanks everyone again...
by lizardmech
Jan 17 2019 10:06am
Forum: Motor Technology
Topic: DA-90 motor
Replies: 18
Views: 1860

Re: DA-90 motor

It looks like although peak power and efficiency aren't noteworthy it has quite a large RPM range where it has decent power and efficiency. It has a new winding method made by some russians using parallel star and delta winding. The heavy weight seems to be as it is an existing motor with new windin...
by lizardmech
Jan 17 2019 7:55am
Forum: Resources & EV Related Parts and Services
Topic: Duyunov wheel-hub motor
Replies: 66
Views: 6678

Re: Duyunov wheel-hub motor

Actually these might be quite good, looking at the dyno graphs the peak power and efficiency aren't notable, however they appear to have a broader operating range where they still outputting power with decent efficiency when compared to permanent magnet motors. It also looks like they can tolerate a...
by lizardmech
Jan 15 2019 9:38pm
Forum: Motor Technology
Topic: Esc current sensing
Replies: 18
Views: 838

Re: Esc current sensing

They still haven't released the instaspin software for the 280049. It was supposed to be out q2 or q3 2018 now it's q2 2019. :roll: The 280049 does look pretty good though. ok, but they are a great design for motor control especially in this price point. The F28379S/Ds are to expensive and no one r...
by lizardmech
Jan 15 2019 2:44am
Forum: Motor Technology
Topic: Esc current sensing
Replies: 18
Views: 838

Re: Esc current sensing

They still haven't released the instaspin software for the 280049. It was supposed to be out q2 or q3 2018 now it's q2 2019. :roll: The 280049 does look pretty good though.
by lizardmech
Jan 15 2019 12:31am
Forum: Motor Technology
Topic: Esc current sensing
Replies: 18
Views: 838

Re: Esc current sensing

If you can stay under 80V the Ti ina240 is probably the best option. Anything above that and you will need complex isolated shunt sensors or magnetic based sense such as allegro ACS sensors.
by lizardmech
Jan 14 2019 11:40am
Forum: Motor Technology
Topic: Esc current sensing
Replies: 18
Views: 838

Re: Esc current sensing

Thanks for the reply. I have read countless data sheets, app notes and ref designs on SLBLDC motor controller design and construction 85% i fully get and the rest in over my head. Vishay has a .0003 ohm resistor that will put out about 5 watts of heat in my app, well within the soa of the resistor....
by lizardmech
Jan 13 2019 2:52pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 388
Views: 61604

Re: VESC-controller

I should give instaspin a try. I used C2000's for other power applications, but not motot control. I think I saw Lmax and Lmin in their motor parameters which led me to think they use a saliency-based observer. 0.1uF sounds like a very agressive filter with lots of phase lag at high speed. I wonder...
by lizardmech
Jan 13 2019 1:34am
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 388
Views: 61604

Re: VESC-controller

Looks similar to how Ti instaspin foc motor detection works, you give it a target current and ERPM combined with a ramp up period to slowly build ERPM in open loop sinusoidal mode. The only difference is they have 0.1uf filter caps on voltage phase sense, they seem to be able to track the rotor posi...
by lizardmech
Jan 09 2019 10:06am
Forum: Motor Technology
Topic: Sensorless at standstill, development updates and status
Replies: 78
Views: 6893

Re: Sensorless at standstill, development updates and status

You can still sell IP and open source it, you just release it under a GPL license which requires the source code be distributed for the license to be valid, commercial customers typically won't want to release source codes for their products so you negotiate a non-GPL license with whatever terms you...
by lizardmech
Jan 07 2019 7:42pm
Forum: Motor Technology
Topic: Sensorless at standstill, development updates and status
Replies: 78
Views: 6893

Re: Sensorless at standstill, development updates and status

I actually never used processors from TI because their software is/was not available for Ubuntu Linux. TI C2000 processors come with an Eclipse-based IDE that works on linux. Been using it for quite a while in my ubuntu laptop, works ok provided your machine can haul Eclipse. If your main value is ...
by lizardmech
Jan 07 2019 2:11am
Forum: Motor Technology
Topic: Sensorless at standstill, development updates and status
Replies: 78
Views: 6893

Re: Sensorless at standstill, development updates and status

I assume it is considered valuable IP (giving a real advantage over competitors) so they keep quiet about it. TI for instance can patent their method but everyone can read the patents and copy the system. Including the whole of China. So I can imagine they just keep quiet about it. You may also be ...
by lizardmech
Jan 06 2019 4:21am
Forum: Motor Technology
Topic: Sensorless at standstill, development updates and status
Replies: 78
Views: 6893

Re: Sensorless at standstill, development updates and status

All I think about when I hear open source is lots of companies getting rich of my work without any kickback to me (even though I spent a few 100k$ worth of time and thousands of my own money on computers, lab equipment and parts). Second, as an unemployed at the moment I also think about all the pe...
by lizardmech
Jan 05 2019 1:03am
Forum: Motor Technology
Topic: Sensorless at standstill, development updates and status
Replies: 78
Views: 6893

Re: Sensorless at standstill, development updates and status

Thinking about what to do now with this tech. I do not plan a controller IC with this as for me it is more of the same, basically lots of not interesting work. Also setup might be too difficult and would ideally require a PC with Labview for drawing performance diagrams. I was thinking about buildi...
by lizardmech
Nov 02 2018 6:48am
Forum: Motor Technology
Topic: High side vs Low side PWM
Replies: 74
Views: 7265

Re: High side vs Low side PWM

Usually high PWM freq and high switching speed allows you to have less bulk capacitance however it's more demanding on minimizing layout inductance and capacitor ESR. For 100khz you would typically expect to see SMD mosfets and ceramic capacitors placed 1 or 2 millimeters from the drain. Through hol...
by lizardmech
Oct 29 2018 9:33am
Forum: Battery Technology
Topic: DIY Super Capacitors, and Robert Murray-Smith
Replies: 29
Views: 4375

Re: DIY Super Capacitors, and Robert Murray-Smith

I have been following him for a while as well. He says he is getting close to starting limited production and seems to have a work space set up. Interestingly I was talking to him in youtube comments, assuming he gets working ones he was unsure what sort of markets to sell them to. His current plan ...
by lizardmech
Oct 29 2018 8:41am
Forum: Motor Technology
Topic: Switched Reluctance Motors
Replies: 49
Views: 5741

Re: Switched Reluctance - Ideal for DD Hubs?

The biggest difference between synchronous reluctance and switched is that sync ones typically have the phases all joined together like conventional 3 phase motors. Switched reluctance typically have completely separate phases that each have their own ground connection.