Calculating Magnetic Frequency ???

Can you post a drawing? With dimensions?

Most of the given information is irrelevant. Relevant, but not given, is the number of poles in the coil arrangement.

Ok sorry . There will be 3 of each pole ( N, S ) one each so 6 of each pole total

All I have is a CAD drawing of the spindle and Magnet layout but it will not let me post this ?

If your CAD program can export or save as .jpg (among various file types), the CR4 composing menu bar camera icon will let you display it in your post. I am still unclear based on the verbal description alone.

The magnet configuration may have one number of poles, and the coil configuration another. From those, you assess how many field reversals per second occur. Magnet strength and dimensions don't matter.

Good luck.

The frequency should be 172.5, if the rows are aligned.. If they are staggered, that would double it.....Resistance heat is 100% efficient, induction is not a good choice ordinarily for space heating, as it can only achieve about 90%....

Ok I thin the concept of what i am doing here has eluded some of you because of my lack of presentation of said device. I am try to create a Induction heater for my shop , I had initially started with the idea of using spare items around the shop and work. well knowing a little about induction heating from 10 yrs in the Copper rod casting business I want to try a scaled down version in my shop. It is simply a rotating spindle of magnets on a shaft attach vertically to a electric motor. Surrounding the magnetic spindle assembly will be a copper tube and soldered to the outside diameter of this said tube will be a coil of copper tubing which is in turn filled with a water and glycol mixture to achieve a consistent heated temperature to maintain a small hydronic heating system for my shop seeing I have so much hydronic base board laying about .

So I will try to export the CAD of my spindle so you can gain better understanding of what I am Attempting to accomplish .

thank you everyone for your replies

JCD

Well no dice being able to convert it or I just dont know how to do it properly. It was designed with ACAD 2012 believe. so if anygot ACAD viewer i can email you a file but that bout it

Sorry guys

JCD

Instead of using a motor and magnets to induce current in the coils, just energize the coils directly with AC. It might be as simple as a single coil adjacent to an iron plate. You might Google "how an induction range works" or some such thing.

If I understand it correctly, and remembering induction coils I saw, the answer is approximately zero. Induction coils are a simple, sturdy coils surrounding whatever they heat. Spinning any magnetic gizmo in it on the same axis does absolutely not a thing. To do something would need poles (individual coils) on the stator.

The induction coil has none of it, hence no desired result at all.

Efficiency? Forget about it!!

I would have to wonder if it might not be an efficient design after all over directly heating something with a coil when you consider heat loss in the latter. I mean spinning a motor inside some coil has got to pull a lot less amps than heating a coil directly.

Assuming that this is what you mean:-

If the rotation is 3450 RPM then the frequency of the magnetic field will be 3 x 3450/60 = 172.5 Hz

Are you trying to convert mechanical energy (from windmill ?) into heat ?

i gess such would make some sense

the permanent mag.-s to coils E-trans-Fn. must be derived experimentally ... i gess ... & that's the tricky part

1 must know how to design such ... cant help in this issue

the [PrintScr] above the [Ins] captures the Screen Shot in Windows/Linux ? why to transfer anything from CAD

I would try to measure it. A HALL effect probe would probably sense the magnetic field and produce a voltage that a scope could display. The frequency could be easily determined.

The OP asked an interesting - if for power generation useless - question, and I paraphrase:

1,. Having a hefty induction coil used in metal melting and such.

2,. Making a spindle with magnets run coaxially at an rpm.

3,. Asking for the induced frequency (and maybe the use of) the induced current.

4,. Guys go haring off in the boring and unrelated field of conventional gensets.

5,. What gives? The OP's question is unconventional enough.

My take on the OP's original question is:

6,. A conductor have to cut magnetic flux, to generate induced voltage, and current if it is terminated in a load.

7,. A ring in the same plane around a spinning magnet gets induced nothing, as it cuts no flux lines.

8,. A coil is not a ring, not quite. Hence something will be induced. But what?

8.1,. The return line from the bottom of the coil to the top for termination is definitely cutting fluxline, and produces a voltage and frequency dependent on the magnetic flux and rpm.

8.2,. The coil's turns are at a slant angle to the fluxlines. The cut them, albeit less and a slower rate.

8.3,. If there is a single (or single row) of magnets, they induce approximately the same voltages in both the coil and return leg, and they cancel out at the coil's terminals, when the magnet faces the return leg. In other angles of the turn the cancellation is incomplete, hence a AC voltage will show up according the spindle's rpm.

8.4,. Since there are multiple rows of magnets on the spindle, multiply that with the frequency of 8.3,. to get the total.

9,. To get massive power, you need to obey good old Maxwell, and cut some massive fluxlines (df/dt). This gizmo does none of it. Using it as an rpm indicator? Yes, but that was invented long ago.

10,. The PO gave the magnet's strength in lbs. I am unable and unwilling to attempt to estimate their magnetic flux based on it.

(i'm not the thread starter) there's possibility to drive MAG.FLUX through "Stator" that is NOT the COIL (in cvnt. means) but rather "MAG. PATHWAY for flux" -- the induced currents would heat up the "Stator" - i can't predict the efficiency nor structural design of such but H would induce some E -- would collide e¯-s to atoms -- would produce some heat ...

Sell all that hydronic base board laying about and buy an electric heater on e-bay.

I'm with tcmtech on this one.

I agree - last time I scrapped some baseboard heater elements (copper with aluminum fins) I got more than $1/lb. Copper by itself is going for over $2/lb!

So, you have built a device and want to calculate the frequency. Engineers design devices to meet requirements laid out before hand. Since it is already built, just hook up a counter and measure it. If you want a particular frequency, someone here can tell you how to re-make it.