Holcomb Energy Systems:Breakthrough technology to the world

[SolarLab]

Don't remember the source off hand - will search - later.

Thanks

[bistander]

Motor rewind shop talk.
"In Hand"


https://electronics.stackexchange.com/questions/51058/what-is-two-in-hand-coil-winding-how-does-it-affect-the-inductor

"Two in hand" means you have 2 wires in parallel when you wind. This doesn't necessarily mean they are wound at the same time in parallel, it could just mean as you say above that they are connected at both ends after they wind. This is very often done to aid in manufacturing so that they can wind with a lower gauge wire. If 18 gauge wire is too big for your manufacturing processes, you can go to 21 gauge wire, two in hand. I've seen low voltage motors that are wound 3 in hand and 4 in hand. The inductance and resistance aren't significantly affected. Yes, you would use the same number of turns."

Quote above was answer to question found on web link, Stackexchange.

Using parallel strands in place of large diameter copper wire improves slot fill factor, facilitates smaller radius bends at coil end-turns, reduces skin effect. The practice is common in OEM as well as rewindings. But the term "in hand" seems to be peculiar to rewind shops, to my knowledge.
bi

[SolarLab]

Motor rewind shop talk.
"In Hand"


https://electronics.stackexchange.com/questions/51058/what-is-two-in-hand-coil-winding-how-does-it-affect-the-inductor

"Two in hand" means you have 2 wires in parallel when you wind. This doesn't necessarily mean they are wound at the same time in parallel, it could just mean as you say above that they are connected at both ends after they wind. This is very often done to aid in manufacturing so that they can wind with a lower gauge wire. If 18 gauge wire is too big for your manufacturing processes, you can go to 21 gauge wire, two in hand. I've seen low voltage motors that are wound 3 in hand and 4 in hand. The inductance and resistance aren't significantly affected. Yes, you would use the same number of turns."

Quote above was answer to question found on web link, Stackexchange.

Using parallel strands in place of large diameter copper wire improves slot fill factor, facilitates smaller radius bends at coil end-turns, reduces skin effect. The practice is common in OEM as well as rewindings. But the term "in hand" seems to be peculiar to rewind shops, to my knowledge.
bi

bistander,
Thanks - very helpful.


Have a good one!

[Feb2006]

It sure would have helped a lot if the "Ansys electronics desktop student"
had been able to make the transient calculations. 



https://courses.ansys.com/wp-content/uploads/2021/07/MAXW_GS_2020R2_EN_WS03.2.pdf

[onepower]

Bistander

"Two in hand" means you have 2 wires in parallel when you wind. This doesn't necessarily mean they are wound at the same time in parallel, it could just mean as you say above that they are connected at both ends after they wind. This is very often done to aid in manufacturing so that they can wind with a lower gauge wire. If 18 gauge wire is too big for your manufacturing processes, you can go to 21 gauge wire, two in hand. I've seen low voltage motors that are wound 3 in hand and 4 in hand. The inductance and resistance aren't significantly affected. Yes, you would use the same number of turns."

It makes sense because the magnetic field produced by a coil is dictated solely by the ampere-turns rule and the core material. Normally no other consideration is given to any other phenomena which is a defect of the standard methodology.

For example, the field curl about every conductor is presumed to couple with the one next to it producing a larger field around the sum of conductors. This is how the ampere-turns rule was created presuming the current through all the conductors is constant as well as the number of turns. It works so long as these conditions are met and when there not obviously it cannot work.

Think of the laws and rules of electrodynamics like a business contract. What is stipulated in the contract is all that matters and anything else outside that context is simply speculation. The contract or rule means what was claimed and nothing more otherwise anyone could interpret it to mean anything.

For example, the ampere-turns in a coil will change if...
1)The conductor length or number or turns changes.
2)The current is not uniform which ultimately relates to the electron density/velocity/emission within any said conductor.
3)An external force acts on the conduction electron in a non-uniform way producing a non-uniform current.

So we could refine the ampere-turn rule to encompass more unknown variables by simply stating that the number of conduction electrons per unit length actually acting through a given length define the field strength within that length. Any other claim is simply speculation because as Faraday implied we cannot know the countless ways in which the conduction electrons could act. For example, if X electrons moved Y length at Z velocity then 20% of the electrons were radiated from said conductor then obviously they cannot be included as conduction electrons from the point of emission forward. Thus we can only apply the rules where they apply within the context they imply otherwise were not actually following the rules...

Regards
AC