The bistander thread

[Turion]

My LCR meter appeared this evening, but have been too busy to do the tests. Have to put a new battery in the meter first. Had some setbacks on my house. Inspections required septic system be replaced and all supports for the second floor deck. Septic I won’t mess with, but taking all decking material off the deck so I can replace the supporting structure is my next and final project. Unless, of course, they have to have a section of the fence taken down to get the truck in and out with the new septic tank. Just when I think I am almost done, something new pops up in this money out of a house.

[Quantum_well]

Take it or leave it, don't grumble!

https://youtu.be/esUb7Zy5Oio

[Quantum_well]

Turion,sorry to hear you're not sure about your skeptic tank! Part of our company installs sewage systems. For my own use I bought a secondhand bio disc from a local pub. It must be rated at about 100 arsepower, the disc is about 4ft diameter by 8ft long. Its driven via a huge reduction gearbox and a little motor. When I was motor testing I discovered to my horror how inefficient an induction motor is on a light load.

[lotec]

Turion,sorry to hear you're not sure about your skeptic tank! Part of our company installs sewage systems. For my own use I bought a secondhand bio disc from a local pub. It must be rated at about 100 arsepower, the disc is about 4ft diameter by 8ft long. Its driven via a huge reduction gearbox and a little motor. When I was motor testing I discovered to my horror how inefficient an induction motor is on a light load.

Hi Quantum,
I would have thought the type of power you describe here would work best under a low load situation. At the end of the day it is only a car. With all the speed limits around, does it really have to break the sound barrier? Perhaps for the sake of economy it could benefit from some kind of tesla turbine variable tourqe converter so it only burns the juice when absolutely necessary.

[lotec]

Make back EMF your friend .

[Quantum_well]

Screenshot_20210324-115609_Chrome~2.jpg Hi Lotec, the one post was describing my sewage treatment plant. It was an attempt on my part to add a bit of humour.
The thing I wanted to point out was the importance of matching load and motor. See the chart.
I think it's well worth watching video I put on post 1532, by cleverly considering back emf they managed to up the performance by two percent. I think a 96% efficiency for a relatively small motor is astonishing.

[lotec]

Hi Quantum,
Yes that is an awsome motor. And yes that was the funniest post ive seen here for quire a while. I was trying to be funny too, so i guess i wont be quitting my day job. In my defence i was trying pretty hard to cover it up, so as to avoid any blow back.

[Quantum_well]

My intuition that GOES would be ideal for an axial flux generator is reinforced by this quote from Magnax.

The Magnax Axial Flux machines use ThyssenKrupp’s high-performance grain-oriented electrical steel (GOES) for its cores. Grain-oriented steel can’t be used with RF machines because the flux paths in these machines follow a nonlinear 2D path. In the Magnax AF topology, the grains of the steel are oriented in the same direction as the flux paths. Low losses and excellent permeability of the grain-oriented material in the rolling (axial) direction results in a machine with 85% reduced stator core losses and a slight increase of the electromagnetic torque.

[BroMikey]

My intuition

Grain-oriented steel can’t be used with RF machines

and a slight increase of the electromagnetic torque.

30mhz and up is not a motor sorry. You are speaking off the cuff.

https://en.wikipedia.org/wiki/Radio_spectrum

Specify radial flux

[bistander]

Some might know that RF means Radial Flux as used in this context.
bi

[BroMikey]

Some might know that RF means Radial Flux as used in this context.
bi

VLE very low efficiency

https://ncesr.unl.edu/wordpress/wp-c...Axial-Flux.pdf

Buy here. Talk radial Flux? For what?

http://www.permanentmagnetgenerator....ges/radial.htm

Electrified ancillary systems
http://pierrepinson.com/31761/Litera...ryservices.pdf

20 plus years ago released for
https://avidtp.com/product/pm-radial-flux-motors/

[Quantum_well]

Some of this refers to dual rotor.

https://www.magnax.com/magnax-blog/a...-power-density

[BroMikey]

Some of this refers to dual rotor.

https://www.magnax.com/magnax-blog/a...-power-density

less than 100% outdated, this shows the Magnax dual rotor system 3D printed at University. 96% max other times 75% like other motors with terrible heat issues. Good for small actuator motors.

https://www.emworks.com/ckfinder/use...ux%20Motor.pdf

[Quantum_well]

https://www.emworks.com/ckfinder/use...ux%20Motor.pdf

Interesting piece.
I came across this too. Obviously a case of horses for courses.

https://www.powerelectronics.com/mar...nk-size-weight

[Quantum_well]

I realise that this is probably manufacturers blurb, but if it's true it's quite impressive.

Screenshot_20210328-205106_Chrome.jpg