Recent content by Pogo

Hi Xalt. My motors man sent me this: "It is like a car claw-pole alternator except the rotor uses magnets and the claw-pole is used on the stator (instead of the usual copper-wound field coil on the rotor in a car alternator). Alternate fingers of the claw capture flux from all poles of one...

Thanks for the updated drawing, Xalt. The 8 clamps are part of the magnetic circuit, and couple the changing magnetic field (as the rotor rotates) to the winding. I'll check the details with someone I know who is more involved in machines, but I think that the structure changes the rotating flux...

Hi Simpleton. You have to consider the transformer as a coupled system. Changes in the primary circuit affect the secondary as you have said, but the opposite is also true. Changes in the secondary circuit are 'reflected' to the primary. If you poke at the relationships between primary and...

Xalt, I'm sure that you have not got the orientation of the coil and the magnet poles correct. The coil will be wound on an iron former in vertical 'segments', like eight coils in series. These are wound alternately in opposing directions so that the currents caused by motion of north and...

Further to this, I have been able to eliminate the second problem, the ramp, because the individual currents oppose, so one ramp cancels another. Now, if the velocity dependence would reappear...

This is doing my nut in. I'm looking at causes of errors in a rotating gradiometer. It uses a loop of superconductor formed so that the current in the loop is proportional to the gradient of the magnetic field threading the loop. I think that an error current will arise due to the Lorentz...