Search found 43 matches

by ecotech
Nov 06 2019 3:45am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105536

Re: APL's DIY axial-flux motor

I've designed a 3700 Nm , 36cm diameter and 30 kg weight motor in my computer but who knows if a real prototype would work, I always read that FEM simulations reach 95% accuracy but it's all circumstantial. Albeit IMO a diy motor is for fun and you shouldn't bother with high efficiency or power dens...
by ecotech
Nov 04 2019 11:40am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105536

Re: APL's DIY axial-flux motor

No. more power = more amps or more volts :wink: more turns = same ohmic losses given same fill factor (roughly, there are some added losses on low turn motors) You should read this: https://endless-sphere.com/forums/viewtopic.php?f=30&t=102934#p1505648 more turns = more length = more ohmic losses
by ecotech
Nov 03 2019 3:08pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105536

Re: APL's DIY axial-flux motor

more power = more amps more turns = more ohmic losses = less efficient at low rpm
by ecotech
Nov 03 2019 5:40am
Forum: Items Wanted
Topic: 50/100 kW PMSM Survey
Replies: 5
Views: 1274

Re: 50/100 kW PMSM Survey

2000 is too cheap
by ecotech
Nov 02 2019 6:44pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105536

Re: APL's DIY axial-flux motor

But I know for a fact that cooler copper is more efficient, and is visible if you put power to a coil and watch the flux drop Huh? Resistance goes up with temperature but is flux of a coil affected? In what application? This can only happen if the coil has a ferrous core , it can't happen on corele...
by ecotech
Nov 02 2019 2:55am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105536

Re: APL's DIY axial-flux motor

There are big companies that use one sided axial motors like YASA and others but again if you don't care about power density go with sandwich types. These are easier to get them working since there are no hot spots in the B fields.
by ecotech
Nov 01 2019 5:38pm
Forum: Large EV General Discussion
Topic: 300hp single seat off road buggy project
Replies: 49
Views: 9724

Re: 300hp single seat off road buggy project

They use a battery that can deliver 400 kW of power from 100kWh of capacity ..iE its 4+C capable. You can buy 4C batteries can't you? lithium ion is not a secret technology the problem is that chinese factories use low cost materials i.e. thin graphite foil, badly pyrolyzed lifepo4, cheap electroly...
by ecotech
Nov 01 2019 4:45pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1176
Views: 105536

Re: APL's DIY axial-flux motor

IMO axial setups are better off using only one side and not a sandwich type motor, you can find research that suggests this notion, it's because the fringe field where the magnetic flux is concentrated is moved to the outside when using two sets of magnets or coils so you get less torque but the ups...
by ecotech
Nov 01 2019 4:12pm
Forum: Motor Technology
Topic: Looking for someone who can run motor design software
Replies: 4
Views: 879

Re: Looking for someone who can run motor design software

Hummina Shadeeba wrote:
Nov 01 2019 9:30am
Just using emetor’s motoranalysis these days and it’s free.
Will try this, I've used maxwell and comsol before.

Is it my guess or you can't even make an axial flux induction motor in this? It only has presets for cage motors and it feeds the 2D geometry to the matlab solver.
by ecotech
Nov 01 2019 8:15am
Forum: Large EV General Discussion
Topic: 300hp single seat off road buggy project
Replies: 49
Views: 9724

Re: 300hp single seat off road buggy project

How does TESLA make a 500ish hp car with a 100kwh battery pack then? :lol:
by ecotech
Nov 01 2019 7:41am
Forum: Motor Technology
Topic: Looking for someone who can run motor design software
Replies: 4
Views: 879

Re: Looking for someone who can run motor design software

How much did motorsolve cost? I don't get what you're saying about the winding, if the program doesn't have the winding as a prefix you may have to design it from scratch.
by ecotech
Nov 01 2019 7:29am
Forum: General Discussion
Topic: Voltage/Current shaping controllers
Replies: 0
Views: 1759

Voltage/Current shaping controllers

Hey guys I am searching for information about voltage shaping controllers, I've read research regarding signal shaping for torque ripple reduction but what I'm trying to do is keep the current input to the coils a true sine wave while adjusting the voltage input, I've run FEM simulations for a proto...
by ecotech
Jan 10 2017 10:55am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1653
Views: 239844

Re: Thread for new battery breakthrough PR releases

The secret is the graphene. They say it is going to change the future. I am very happy with my new 10AH graphene cells from WESTART factory, I can charge them in mimutes with 30A without any problems. in the future they are going to be much more powerful when the companies will be able to take the ...
by ecotech
Dec 30 2016 10:08am
Forum: Battery Technology
Topic: Lithium Batteries Shipping Rules Discussions
Replies: 291
Views: 80887

Re: Lithium Batteries Shipping Rules Discussions

Well from what I can tell as long as you don't send the batteries as batteries but send them as a package with something else , i.e. a battery charger that has all the batteries attached to it, then you can send it as a battery charger and not as a battery, that's how companies bypass the dangerous ...
by ecotech
Dec 28 2016 4:32am
Forum: Battery Technology
Topic: New non exploding batteries soon
Replies: 18
Views: 1894

Re: New non exploding batteries soon

Solid electrolytes have low ionic conductivity at room temperature.
by ecotech
Dec 24 2016 9:49am
Forum: Battery Technology
Topic: Westart 20AH pouch cell
Replies: 62
Views: 8478

Re: Westart 20AH pouch cell

999zip999 wrote:Isn't this method widely used with no problems. It looks like same method as A123 20ah pouches that are almost 10 year old no problems.
Yes many lithium batteries are build this way but it depends on the active material.
by ecotech
Dec 20 2016 5:15pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1653
Views: 239844

Re: Thread for new battery breakthrough PR releases

Zapgo doesn't say anything about energy density we all know supercapacitors charge in seconds.
by ecotech
Dec 20 2016 5:06pm
Forum: Battery Technology
Topic: Westart 20AH pouch cell
Replies: 62
Views: 8478

Re: Westart 20AH pouch cell

I wouldn't buy lithium batteries with aluminum sheets , lithium complexes with aluminum forming an alloy some batteries use the alloying method as a storage mechanism but these batteries alloy irreversibly I suppose so when the active layer gets swollen with time the lithium will get trapped in the ...
by ecotech
Dec 10 2016 1:31pm
Forum: Motor Technology
Topic: How is this possible - New motor technology
Replies: 5
Views: 1226

Re: How is this possible - New motor technology

How on earth do you get 95-97% efficiency with 7500 amps? Did the guy invented room temperature superconductors?
by ecotech
Dec 10 2016 4:14am
Forum: Motor Technology
Topic: Motor Design Software
Replies: 8
Views: 1493

Re: Motor Design Software

2D FEMM software is not accurate use a 3D solution look here http://www.cvel.clemson.edu/pdf/ACES09-736.pdf ofcourse you could use a wrong solution I've seen some motor designs in thesises that don't work.
by ecotech
Dec 04 2016 5:43am
Forum: Motor Technology
Topic: PM Motor theory - formulae etc.
Replies: 71
Views: 45181

Re: PM Motor theory - formulae etc.

Not all motors use iron and magnets. :mrgreen:
by ecotech
Dec 03 2016 2:53pm
Forum: Motor Technology
Topic: PM Motor theory - formulae etc.
Replies: 71
Views: 45181

Re: PM Motor theory - formulae etc.

It's when a motor doesn't have a linear torque curve, it goes up and down in motors and if a small motor has a lot torque ripple you will feel vibation from the motor.
by ecotech
Dec 03 2016 7:02am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1653
Views: 239844

Re: Thread for new battery breakthrough PR releases

I wrote a detailed post but my laptop chose now to post it and I'm bored or writing it again. Short story supercapacitors need 1000kg to store same same energy as 100kg ion batteries, RMS battery nothing new needs marihuana or sea weed , vacuum furnace, stores electrolyte ions in carbon.