Endless Sphere

Loving them lights be perfect for a winter trek through a forest giving her some beans, in the UK the cops will get they knickers in a twist with any of then used on the public highway even the led shown above is a no no, the beam pattern can be all over the shop and only a small handful actually gi...

So you are sayinf Mayweather wasnt even the best boxer to pitch against McGreggor ! I suspect if you put a prime condition Tyson in with any MMA opponent ,..Tyson would have taken it... ....in any shaped ring, or back street, any rules ! Mayweather and McGregor was a good match up but if it was on ...

But didnt Mayweather distroy MMA champ McGreggor, in Vegas. ? Let's see mayweather give it to McGregor in the octagon without queensbury rules the fact he stood toe to toe with the best in weight class is no easy feat. McGregor was picked for his style of fighting, a ground and pound expert would n...

90/65R6.5 tyre on a aluminuim decent rim the 60v1600w hubs like what's on the dualtron is more than good for 70mph and not exploding. The issue with scooters is the faster you go more the giro effect pulls on your body as you turn resisting the turn and stopping the lean in I found after 45mph I wou...

Don't expect to much continuity between them I had 4 motors and only 2 were identical, all the cases had the same pattern size and shape but internally there was different bearings used with differing OD on the stator and the end caps used differing casts. It leads me to believe the manufacturing of...

Problem we have is POLITICS. The tipping point has come and gone the issues are more to do with what nipple we are used to suckling on, if the oil had dried up in the 90's do you think we would be immobile 20 years later ? Nope things would change over time as they always do but the main issue we ha...

Induim gets doped with iron to make it magnetic for industrial uses so my educated guess is that over time the Induim will become magnetic at least on it's surface, I don't know if you have look at the galvanic corrosion properties but it's the enamel on the winding that will have to form a seal for...

Thermal grizzly cryonaut cpu paste is a mixture of tin, gallium and indium and that stuff eats into the surface of anything that's not nickel plated, putting it on the enamel of the copper is a risk in itself and this stuff is liquid and thin so it maybe highly conductive but only a thin coat can be...

It's a brave bold move for sure, they are the only manufacturer to take this path. I can understand it though from tesla point of view if your customer relations are poor just terminate the lot of it and go Amazonian on people, apple followers will hurd to any gate even if it was the north pole peop...

Yes you need to switch the resistor in then out and over to the main breaker after the system has precharged, you may want to monitor voltage with a multimeter to work out how long the capacitive side of the controller takes to charge if you don't have a volt/amp meter installed.

No spinning stator so no added spinning mass. For outrunners and hubs like our own true only total mass is effected but Inrunners like my kuberg motor then it's a consideration. IMG_20190208_223309767.jpg I'm chatting shit again the coils are stationary so pot,solder away not making much sense toda...

Hummina Shadeeba wrote: ↑

Feb 27 2019 12:50pm

No spinning stator so no added spinning mass.

For outrunners and hubs like our own true only total mass is effected but Inrunners like my kuberg motor then it's a consideration.

I Think the encapsulants accelarated mass needs to be considered to as well as that extra mass increasing the no load current what a massive juggling act.

Electrical conductivity. Thermal conductivity. Thermal expansion. Specific heat value. Reaction to a magnetic field at both ends of the motors thermal working limits. Any others anyone can chime in ? I plan on encapsulating the end turns on the motor pictured and use ferrofluid so I need to consider...

Great find and top work on reperposing it, what's your planned use for it.

I came to that conclusion keep the switching frequency low as possible for the mosfets switching efficency but high enough to be well clear of the L/R time constant. The Torque/current in the motor is self regulating in normal running circumstances the faster it's spun the larger the back emf become...

I've had a think about what's going on. There's two frequencys, the pwm frequency that has a duty cycle to control the amount of voltage the coils see. Then there's the erpm, the voltage that the motor sees from the pwm signal will spin the motor at a certain rpm that is then calculated by the amoun...

Your question of duty cycle and pwm has made me learn how to calculate a good switching frequency with a vesc. https://electronics.stackexchange.com/questions/296051/bldc-pwm-frequency Nice little read by there on calculating duty cycle for efficiency, there's two half's of the puzzle the motor with...

Whenever something makes me sick and its not often but it happens in life, I crave bacon with a tin of plum tomatoes but only when my appetite comes back I'll spew again otherwise just with the smell how can bacon smell so good but when your feeling sick the sizzling smell is the perfect projectile ...

Unlucky on the broken rivet, not a perfect test run but productive better to see the faults early on so a fix can be implemented. I still think the hoverboard wheels are the way to go they could be slotted in a sleeve and bolted in place with a m10. How do you plan to get it to turn better more accu...

I think iron will be needed in this motor at least for the great increase in magnetic strength it brings. But the casted zinc? I’ll be seeing what resin I can find that could be vacuumed into the winding first and hopefully not breakdown w the heat of the casting. 650c. Almost heat resilient enough...

Hysteresis The phenomenon in which the value of a physical property lags behind changes in the effect causing it, as for instance when magnetic induction lags behind the magnetizing force. it's the magnetism in the core that lags behind the changing field it's the induction thats causing the heat sa...

If an ac current were being fed through the coils at a fast enough frequency to produce eddy currents the iron teeth would be heating up especially as it’s feromagnetic and would be heating through hysteresis as well as Eddys. But they don’t heat through these and the frequency is not fast enough. ...

I'm not using coal or will I since our valley stopped the majority of use I can go in my attic and not have a layer of soot over the plastic xmas tree. I will say though that a decent coal fireplace is around 80% efficient less for an open fire but nowhere near 5% unless you trying to heat your hous...

Electric motors are at 97% and there is still room to improve. Batteries are just getting started. I agree with your points and i drive a ice car but not a defender of them, but I would say current electric cars are not as good as made out, efficiency on the motor can be upto 93% at its full speed ...