Search found 2219 matches

by Ianhill
Oct 21 2021 1:41pm
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 84
Views: 3016

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

You will need a antispark switch for ease of use. You can make a 2 stage switch with a resitor to power up the capacitors slowly then switch over. I find the antispark switches good even if i broke one. You can roll the scooter forward the switch detects the motor emf and switches on after a set per...
by Ianhill
Oct 21 2021 9:21am
Forum: Motor Technology
Topic: Axial flux hub motors.
Replies: 0
Views: 80

Axial flux hub motors.

Why dont we see axial hub motors in use more often? Stand up scooter have tapped out the hub motor and gone to a dual setup to get the power needed to pull a human at a decent speed, 5kw or so for around 30 seconds and the motor gets too hot prolonged abuse at this level will see it enter the shadow...
by Ianhill
Oct 20 2021 12:28pm
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 84
Views: 3016

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Thats a pity the 72v vesc varients would have made a lovely smooth ride with variable regen, hoveeboard motors run impressively well shame these don't. I see kaabo uses a one piece rim on the warrior to help balancing at high speed as a pair they run 7.4kw but the rion use a single hub on the rear t...
by Ianhill
Oct 18 2021 6:27am
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 84
Views: 3016

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Ive had issues with a flip vesc 6.6 running a dualtron motor on 12s and 40amp, even when i lowered the battery setup it would stall and make a horrible sound after 2 attempts and a few hours trying to change parameters i got it to turn but was not inspiring. Were you running it sensorless ? I could...
by Ianhill
Oct 17 2021 7:33am
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 84
Views: 3016

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Ive had issues with a flip vesc 6.6 running a dualtron motor on 12s and 40amp, even when i lowered the battery setup it would stall and make a horrible sound after 2 attempts and a few hours trying to change parameters i got it to turn but was not inspiring. A hoverboard motor on the other hand was ...
by Ianhill
Oct 15 2021 1:41pm
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 131
Views: 9230

Re: True FOC: definition and examples

Yes bldc are frequency controlled, the voltage caps the peak of the sinusoidal wave and there has to be enough capacitance in the circuit so the current does not lag the voltage by too much as thats where bad efficency starts to happen such as the fets case will be passing alot of current as heat. I...
by Ianhill
Oct 15 2021 7:05am
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 131
Views: 9230

Re: True FOC: definition and examples

Many moons ago i done a 3 year industrial installation engineer course in uk without that i would be nothing, first year is basic learnt SI units and formula transposition, ohms law, flemmings left hand rule then built upon that, we touched on all aspects of an installation be it what type of light ...
by Ianhill
Oct 14 2021 6:31am
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 84
Views: 3016

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

The anti sparks ive had so far have failed well below rated, i got the new 300amp version and id say ot will do 60amp its got 10awg cables on it. Water cooled version rated 200amp 26s with 8awg cable i run it 16s 60amp got myself 3 miles and noticed i couldn't power off fets had blown. Im dubious of...
by Ianhill
Oct 13 2021 4:42pm
Forum: Alternative Energy
Topic: World's most efficient wind turbine?
Replies: 27
Views: 544

Re: World's most efficient wind turbine?

For a fixed setup thats working along side solar with some storage to fill in the blanks it could work for many year's all landbased for easy maintenance and upgrades if needed. With a well calculated power demand and a mix bag system that covers your needs be excellect to power a small building mid...
by Ianhill
Oct 13 2021 5:51am
Forum: Alternative Energy
Topic: World's most efficient wind turbine?
Replies: 27
Views: 544

Re: World's most efficient wind turbine?

Looks a well balanced machine capable of powering a few bulbs so he harvesting 500w or so from a huge jalopy thats more area than 2 solar panels but with less output than them, let me ask what efficency is solar again ? Its shit its not even using lift its a windmill nothing more. If space is an iss...
by Ianhill
Oct 09 2021 9:24pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1507
Views: 138136

Re: APL's DIY axial-flux motor

I thought it looked odd good to see im not going mad just yet then, id of thought as long as the step from lamination to lamination is less than its thickness the step up the side would look fairly uniformed to the eye but on the micro level would still reveal sharp edges. Is it worth adding another...
by Ianhill
Oct 09 2021 2:45am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1507
Views: 138136

Re: APL's DIY axial-flux motor

magnax.png See how theres a jagged edge down the face without rounded edges, on traditional motors that would be hot spots on the steel. Im aware the segments are built from laminations but they stack in a different oreantion theres a flat face of stator facing the magnets rather than edges face on...
by Ianhill
Oct 08 2021 4:30am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1507
Views: 138136

Re: APL's DIY axial-flux motor

Whats strange from my observations is the stator teeth on the magnex picture i posted, they have a sarreted edge down the face reverse to what i have seen to date specially non axial any breakdown will occur at these points. Got me thinking is this what they are doing to eek a bit more efficency out...
by Ianhill
Oct 06 2021 7:56pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1765
Views: 278850

Re: Thread for new battery breakthrough PR releases

Theres 4500mah lipo from 2014 that have 45c discharge 25kg worth would be 4.2kwh and 180kw peaks available then theres a newer 5000mah cells that kick that figure well into touch then theres the newest lipo ive seen is a 2020 cell thats 5500mah 120c 110g a cell a pack configured with them in theory ...
by Ianhill
Oct 05 2021 3:19pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1507
Views: 138136

Re: APL's DIY axial-flux motor

Personally i think you give it a good go and not to win first time is fine keep at it redesign and rebuild. I think a yokeless design is where you can gain the required strength try and emulate magnax design. magnax.png Looks like ive got 2 more threads to read though keep up the good work well done...
by Ianhill
Oct 05 2021 12:31am
Forum: EBike General Discussion
Topic: How do you think solid state batteries will change how we use hardware?
Replies: 119
Views: 2866

Re: How do you think solid state batteries will change how we use hardware?

When a hub is used as a middrive theres 2 freewheels on 1 chain and the lightest to operate wins but if the rear is locked up the hub can use the rear deralier in a sequential mode fireshifting through gears as the wheel turns and give crazy high efficiencys but theres no peddle ability then the hub...
by Ianhill
Oct 03 2021 3:56pm
Forum: EBike General Discussion
Topic: How do you think solid state batteries will change how we use hardware?
Replies: 119
Views: 2866

Re: How do you think solid state batteries will change how we use hardware?

Question is how to dis/engage electronically without using more energy than existing systems. A puck clutch is direct light and efficent but needs effort to engage and disengage the system needs to sense throttle/regen input and instantly act not an easy task. Mobility scooters use electric brakes m...
by Ianhill
Oct 03 2021 11:52am
Forum: EBike General Discussion
Topic: How do you think solid state batteries will change how we use hardware?
Replies: 119
Views: 2866

Re: How do you think solid state batteries will change how we use hardware?

Axial flux motor improve torque production while keeping no load current small as possible, i see the inertia of these motors is low but torque high so if one could be mounted as a hub motor the improvement in torque to weight would be drastic. Regen ability would be huge the field lines are all inl...
by Ianhill
Oct 02 2021 11:58am
Forum: EBike General Discussion
Topic: How do you think solid state batteries will change how we use hardware?
Replies: 119
Views: 2866

Re: How do you think solid state batteries will change how we use hardware?

Basic maths means your 2.3kw battery can assist your 1200km trip with on average 1.91wh per kilometer or 750mile journey needs 3wh per mile average. Ive got down to 10wh on a cargo bike you need a 3rd of that so your gonna have to join the lycra brigade and use the battery just for climb efforts lik...
by Ianhill
Oct 01 2021 4:38pm
Forum: Battery Technology
Topic: Usb pd 3.1
Replies: 0
Views: 108

Usb pd 3.1

Seems usb c pd has got to the point it could be used as a charging standard for most small use cases. 48v 5a max 53.65v programable in steps of 100mv with 3a and 5a current outputs meaning it could chsrge the average 650wh pack from empty in under 3 hours. While being extremely compact and of the hi...
by Ianhill
Oct 01 2021 10:53am
Forum: EBike General Discussion
Topic: How do you think solid state batteries will change how we use hardware?
Replies: 119
Views: 2866

Re: How do you think solid state batteries will change how we use hardware?

Id love to see someone average 10mph on a peddle bike while climbing the hills of any of my locals. on the decent side of my trip id lose to the lycra brigade on a nice sunny day id be to 20mph they would be over 30mph but in the climb id be there steady 10-14mph while they drop cogs to under 5mph a...
by Ianhill
Sep 30 2021 6:51pm
Forum: EBike General Discussion
Topic: How do you think solid state batteries will change how we use hardware?
Replies: 119
Views: 2866

Re: How do you think solid state batteries will change how we use hardware?

Tom stanton just done a video where he claimed 40% with a supercap setup. The video was long winded to get to 3 mins of decent data at the end the motor he made was poor considering his background and he never broke above 20 mph for a 30 second test so over a hill yeah thats its peak efficency and b...
by Ianhill
Sep 30 2021 5:45pm
Forum: Motor Technology
Topic: Unite 1020 brushes.
Replies: 7
Views: 270

Re: Unite 1020 brushes.

So we got 2 my1020 brushed motors running the blades and the a 3 phase motors for traction, i only see 3 wires on that motor so theres no rotor detection its sensorless i imagine it runs through a high reduction to spin the wheels so been sensorless is not much of an issue and i imagine your happy w...
by Ianhill
Sep 30 2021 10:32am
Forum: Motor Technology
Topic: Unite 1020 brushes.
Replies: 7
Views: 270

Re: Unite 1020 brushes.

Any pictures of your build, intended use case etc. I got a 10s chainsaw im upgrading now i tend to run 30 seconds or so at a time with a long pause so i can dump a bit of heat into the motor and get away with it, my plan is to run a skatboard controller so i can take away the slow ramp up and i can ...
by Ianhill
Sep 29 2021 2:50pm
Forum: Motor Technology
Topic: Unite 1020 brushes.
Replies: 7
Views: 270

Re: Unite 1020 brushes.

To many amps the brushes arc heat gets to intense, 60amp on same motor i just got about 2 hours run time but it went like the clappers arc flash lighting up bright white in the dark, i had all intension of breaking it but i did hope for a bit more than i got. The brushless versions take around 4kw p...