Endless Sphere

no..

Lebowski, can you also explain a little more about 141 percent T? Basically you have the flux from the permanent magenets (100% T) and the flux from the coils. Lets say the flux from the coils at max phase current is also 100% T. These two fluxes are at a 90 degree angle of each other (for max torq...

I still think where the coils are wound the area should be minimal (based on flux and what material can hande, dont forget 141%), and round ! could you please explain a little why it is so important for coils to be round? in most radial flux motors i've seen the coils have almost rectangular shape ...

I still think where the coils are wound the area should be minimal (based on flux and what material can hande, dont forget 141%), and round !

Why build this boost converter and not just use field weakening ?

Arber, you want to measure after the boost converter, so at the power stages.

Arlo1 wrote: ↑

Oct 01 2019 11:12am

Amber this needs to be isolated!

That's why I posted the circuit!

Depends on how far reaching you want your power stage blowup to be

Arber, i dont really understand the distinction beween the 400 and 650, but the controller ic needs to see the power stage supply voltage.

Still... your magnets make a certain flux. With the coil current flux rises to 1.41 times this. For this flux, keeping saturation in mind, you need a certain metal area. The smallest circumvence (wire length) your get for a circular area..

Arber, I think you misunderstand. When you want to deal with a 400 V battery you need to divide this voltage down by a factor 80. The controller IC will then work correctly for battery voltages between 200 and 400V, as these map in the 2.5 - 5 V range. You should not map 0 - 400V on 2.5 - 5V ! You'r...

I use just a resistor, but Arlo1 haf a good isolating opamp in his high power design.

Yes it is programmed only for a range of 2, as that should cover a battery between empty and full ...? It needs to do a 1/x internally, the factor 2 is chosen to limit the output range of the 1/x calculation...

Yeah, rings embedded in an insulating rotor repelled from high frequency coils. Higher frequency than rotation for efficient repulsion, but with modulated intensity that rotates in much the normal slow way. Except pushing rather than pulling. Starting to sound like a squirel cage induction machine...

Just my take on motors... i look at them as voltage generators. Motor power comes from volt and current, so the motor should make as much volts as possible and conduct current as efficiently as possible. For me thinking in terms of electromagnets is not where its at...

My point is not about this specific car. My point is that everyone is building supercars with awesome power and accelleration, but what is needed is a reasonable car for the masses at low cost. I for one am tired of seeing all these fat cat playboy cars with accelleration this and a 40" screen that ...

Pffff rediculous. Why not make a cheap eurobox with 70kW (peak power) and 500km range ? Much more usefull and effective for getting people in electric cars. All this high tech gadgetry and high performance just makes the cars too expensive and out of reach for most people. because nobody is going t...

.......i just hope that the new generation S has the model 3 cells when they start selling the plaid 3 motor kit. putting down nearly 10.000nm of torques into some poor tires is going to be awesome....... 10,000Nm ! :shock: ....that would truely be more than Awesome ! :lol: Pffff rediculous. Why no...

The last picture you show : Hm. I would want the moving rotor to generate air flow over the coils...

Yeah but the point of the steel is to 'focus and compress' the magnetic field so that the wiring length (resistance) is reduced. How is that achieved here ?

In a coreless motor the torque comes from the Lorentz force: https://en.wikipedia.org/wiki/Lorentz_force F = B * I * l with B the magnetic field ( https://www.kjmagnetics.com/gap.calculator.asp ). For two round 25mm magnets, 7mm thick, grade N42, spaced 7 mm, no yoke, roughly 4000 gauss average. (or...

Was it your intension that the 25mm PM's fit within the center, or 'eye' of the 40mm coils? I assume thats to take advantage of the radial winds on a circular coil? I'm just curious as to why not a more compact, (hole-less?), coil. I'm trying to understand the action of a coreless coil on the PM. M...

How about something different than a normal bike ? Maybe a tadpole trike ? Low to the ground, so maybe less battery capacity necessary to do the distance ? Probably also more stable at high speed and capable of carrying the battery weight ?

My motors were (mechanical output) 750W at 900 rpm for v1 and 3000W at 1500rpm for v2. You can calculate the torque (its saturday morning now, reading the news with coffee and croissant, sitting in the sun, not in the mood for calculations) For my motors the limiting factor is the balancing of the r...

I would calculate if the pointy of your stator makes sense. It increases backemf as there is more circumvented flux, but does it outweigh the extra wiring length (resistance)? This can be calculated and optimised ! Also, the prupose of the stator metal is to reduce wiring length. The metal takes the...

One more remark about SR motors, For PMSM (what we have with the magnets), Torque proportional with I, losses with I^2, So at half of max torque, I=0.5*Imax, losses proportinal to 0.25*Imax^2 For SR, Torque and losses both proportional to I^2 So at half of max torque, I=0.71*Imax, losses prop to 0.5...

SR is the top pick from an economic/business standpoint not an engineering one. but people not in the know that look to others for guidance will think "well, if Tesla is doing it, it must be good." just like they do with Tesla's sub-optimal engineering choice of 18650 which had more to do with not ...

Man, 250c, they'll be empty in 14 seconds !

Next step is a proper controller