Thank you. I see what you are saying. But I think you may be overlooking the effects of a contained field. For example in the case of a cubical array made of square coils. For sinusoidal bipolar signals, there is a reciprocally moving field gradient between coil faces.
You previously mentioned quad phase Helmholtz coils as the best approach. Were you referring to a set of bipolar sine and cosine waves? These could be easily generated with a dual channel RF generator.
However, the hangup there might be with standard CB radio amps; coupling and perhaps not...
Thanks to all for pointing out my mistake. I see that on a practical level I would need to stay within certain parameters of frequency and coil size.
According to Baluncore's calculation above, if one were to use 27MHz off-the-shelf CB equipment, that would enable a manageable 1.767m array...
I like the term "phase velocity", but I believe there could be more.
In trying to clarify, I may have confused. The example in my OP was a four phase array.
The second was a square wave stepper. This may be easier to visualize. There would be a near field associated with each coil moving...
"Stepper" motors are used in hard drives and positioning systems. I will try to explain more clearly.
Imagine four solenoid coils evenly spaced upon the circumference of a certain diameter. Each is energized in sequence until a full rotation is achieved. The rate in Hz at which the energizing...
I see your point, and realize the wording of my original question was open to misinterpretation. What I should have stated is "stepped" coils, not quadrature. My apologies for the misstep.
Can anyone please answer the question regarding the calculation? I have rephrased it below.
I would like...
That is a "yes" to Keith's question.
To take a specific example, if the signal to the quadrature coils is 150MHz, what diameter, or radius, is required to reach the speed of light?
I would please like to see the actual calculation so I can apply it to any frequency of interest.
I would like to know how to calculate, for any specified frequency in Hz, the required diameter of a 90 degree phased, quadrature coil array such that its generated EM field achieves rotation at the speed of light.
Could someone please provide an example of the calculation using a specific...
Hmm. now the buttons have appeared in the "Have something to add?" field. IOW I needed to reply to myself (apparently).
So here is the diagram I made to clarify my original question.
If I could upload a screenshot, it would show there is nothing to the right of the post reply button. It's on the very edge of the content box. No "preview" button either. At a loss to explain, but then I use Linux.
Can anyone offer a reply to my original question?
If you mean the icons in the gray bar at the top of the text entry window, I find nothing that reads "upload". I can add an image but it then asks for its URL. My apologies for the handholding exercise, but I use a computer regularly and see no direct upload.
From another source, this is the...
Can someone please help with this thought experiment? I have sought advice elsewhere but it remains unclear to me.
I have a straight piece of two conductor "figure eight" wire (like speaker wire or US power cord) laid out left to right.
I connect the output from a push-pull type audio...
I did not mean to disagree with you, but was rather inquiring about any predictable effect upon the ideal linearity of a plate cap that might be caused by insertion within it of an EMF radiating coil.
There appears to be a difference of opinion on this since the charge/discharge curves of a cap are exponential. There is no straight line relationship between V and I unless plotted together.
The dielectric material also needs to be factored in. Does it have ferroelectric properties...