Recent content by orphefs

I'm sorry for being stubborn..I actually put the functions into MATLAB and superimposed them, giving me a 50 Hz sinusoid! Sometimes you need a kick in the butt to realize something! Thanks though! (I can't remember being taught this, maybe I was too busy missing my lectures in the first year...

actually, the simulation was done at 50 Hz, and the resulting resistance and inductance were complex..however, if you are referring to eddy currents, you are very correct indeed! :smile:

Precisely. The modulus of the output impedance is |R+j{\omega}L{\times}{\mu_r}|, where {\omega}=2{\pi}f, and if we substitute the values, this yields |0.7+j{\times}314.16{\times}0.019{\times}5000|=29.8k{\Omega} roughly... By the way, I think we mean the same thing regarding the waveshape...

yes, but they are not in phase! 120 degree phase difference...this means that their superposition (although all of them are at 50 Hz) will yield a different waveform! http://en.wikipedia.org/wiki/3_phase" depending on the positioning of the scavenging mechanism in the plane of the conductors...

I know the real thing will differ, however at this stage I am not able to build the coil yet. :( (plus I don't have the equipment since I am not anywhere near the university) The lossy component is quantified as a resistance (0.7 ohms) in series with the inductance. These results I got from...

well, as I mentioned earlier, the coil will contain a magnetic core in its interior that will concentrate the flux lines...the problem is that this maximises the inductance and limits the power output of the mechanism when the load is small..

I tried what you said, however I need some more help with the simulation, because it seems like I am not doing something right, having some troubles with measuring the voltage drops you mentioned correctly; I am probably referencing the wrong nodes... In the attached .jpg, the time-domain...

It is a three-phase rigid power line in a substation. Field magnitudes range from 30 uT to 100 uT (at least that's where the position of the scavenging mechanism can be). However, the induced voltage in the coil will not be sinusoidal, since the three phases lag each other by 120 degrees...

@ Bob S, I forgot to mention that the wireless sensor is not of any concern in my study, since it is a separate project carried out by another student in my department. I only need to find a way to power it through a magnetic field at power frequency. By the way, the biggest problem I am...

30,000 is \mu_r, namely the magnetic permeability of a given magnetic material, in this case a core. By definition, B={\mu_0}{\mu_r}H, where B is the magnetic flux density quantified in Teslas, and H is the magnetic field quantified in Amperes/metre. \mu_0 is the magnetic permeability of free...

Hey! Im trying to pick up power frequency, so ideally 50 Hz, assuming no harmonics. Thanks for the idea, I tried putting a capacitor in series before the load, however didn't see much difference, what value should the capacitor have? I am not worrying much about the construction yet, this...

no ideas? :(

Hello all! I am a student of electrical & electronic engineering, in my final year; for my dissertation, I am exploring the possibility of scavenging energy from a magnetic field in order to power a wireless sensor..I am using a coil of rectangular cross section with a magnetic core occupying...