I have drawings of magnets with physical dimensions, materials, tolerances, etc. How do I add a Magnetic Flux requirement (weber, volt second) so I can measure the magnet when is arrives and be sure that it is fully magnetized? I know how to add this to the drawing literally however where do I...
Does anyone know where I can get a magnet characterized for all four quadrants. Electron Energy use to offer this service but it doesn't show up on their website any longer.
Clyde Hancock
Design & analysis of electric motors and generators
www.motorconsultants.com
I’m looking for some help with respect to skin effect. On a PM synchronous motor, the windings are subjected to the rotational frequency from the PM rotor and to PWM frequency that is driving the motor. I feel that the fundamental frequency of the rotor is the main contributing factor to skin...
I'm looking for information about a winding machine for large diameter wire in a DC armature. I have seen this machine (a long time ago) and I think it was called an "Able" winder. It doesn't wind in the traditional sense (fly, needle, shed, etc.), instead you have to cut the magnet wire to...
I am magnetizing as an assembly.
In some materials you may get 95% of B but only 50% of H, so not good.
How can you have this situation?
Clyde Hancock
Design & analysis of electric motors and generators
www.motorconsultants.com
This is from ExcelCalcs . . . However, it does not automatically update as you make changes. You have to do it manually. For me, not such a big issue.
Clyde Hancock
Design & analysis of electric motors and generators
www.motorconsultants.com
If you are talking about the equation format, they could have been using ExcelCalcs (https://www.excelcalcs.com/). I believe there are others as well. I've used ExcelCalcs for many years. It displays EXCEL formulas as equations.
Clyde Hancock
Design & analysis of electric motors and generators...
Thanks, I understand but I am curious as to how the published data is determined. In other words, what does he magnet vendor due to establish the values they publish?
Clyde Hancock
Design & analysis of electric motors and generators
www.motorconsultants.com
If I subject unmagnetized Neo to elevated temperature but stay below the curie temperature will this adversely affect the magnet when later magnetizing? In other words, will I still be able to fully magnetize the magnet after it cools?
Clyde Hancock
Design & analysis of electric motors and...
I should explain that this discussion stems from a paper by James Gollhardt when he was with Allen-Bradley (see attached). If you reference Fig. 13 you'll see what I mean. You can see that the peak armature field is the difference between the load line and the parallel load line. Now if you...
EdStainless,
I understand what you are saying. What I'm struggling with is explaining to a colleague why it is easier to demag with a larger air gap. They argue that if the reverse field is further away from the magnet that it should have to be stronger to affect the magnet.
Clyde Hancock...
MagBen,
Sorry for being so "thick". What do you mean when you say "you do not physically demag your magnet"? I have researched "recoil curve" and the answer is not obvious to me. I feel a little embarrassed because I can't explain why a larger air gap makes it easier to demag. It is obvious...
That is exactly what I thought however as I was explaining this to a friend and they asked "so if I increase the air gap to 100 times the existing air gap then how would it be easier to demag the magnet". Then he said how would it be easier to demag with an air gap that effectively removes...
Using the magnet thickness and airgap thickness to construct a load line (Bd/Hd) to determine the operating point on the normal curve, and then adding 1 (Bd/Hd +1) I should be able to have a line parallel to this to intersect where the intrinsic curve drops 10% and read the reverse field...
