STARTED FOR ME.... when told that it was even more stupid not to ask, dumb or not !
That said, i can understand getting annoyed and or frustrated by them.
SO~ to restart; Thank you Chuck for your forbearance so far, so perhaps better to explain a few of my *question experiences*......... and please don't take this the wrong way.... any of you.
FOR EXAMPLE ONLY;
i ask once if Chuck was aware of the Halbach array, a simple question~ yes/no.
RESPONSE;
I did look up the The Halbach Array as I wasn't familiar with it by that
name but am familiar with the effect. We do use multiple methods to modify
the magnetic fields within generators. The problem with permanent magnets is
that their strength is permanently set. Most of the time having the ability
to adjust the field strength is a great thing. If we have a source of torque
that is variable we can adjust field strength down so we are not robbing too
much torque. Of course our output varies with the torque and field strength
as well. In some higher output starter/generators they use interpoles to
control the warp of the magnetic field. Fig 79 on this web page shows the
interpoles. Normally the field runs straight from one main pole to the other
main pole, under high load the field rotates with the armature which causes
arcing at the brushes. the interpoles are reverse polarity so the tend to
push the magnetic field back to straight from main pole to main pole.
http://www.fastonline.org/CD3WD_40/CD3WD/ELECTRIC/GTZ021E/EN/B309_8.HTM
Another manipulation of the magnetic field noticeable in Fig. 79 is the main
field. The main N/S poles are right close to the armature but the case/frame
of the generator forms a guide for the flux to circle around back to the
opposite pole. Most cases are made of soft iron because of it's magnetic.
IT"S NOT~ that i don't want or need that degree of answer but that it confuses both me and the way i was looking at the possibilities i think i see in that Halbach Array.
FOR EXAMPLE:
The circular form of that array focuses the majority of the magnetic power within the circle, and i was wondering if , with that 4/6 pole arrangement one could not visualise it as a 4/6 pole magnet..... ONLY with the poles turned inwards rather than as with a permanent magnet facing outwards.
REASON:
A bottle generator(as on bike) spins a permeant magnet within series of soft iron shimes that have then a coil arranged around them, but below the shims.... resulting in a lot of friction and therefore both high resistance and low voltage /wattage.(rated normally at about 6v/3watts)
BUT~ with the Halbach array.... is it not possible if not preferable to have just one soft iron core with a coil wrapped around that.... and then spun... resulting if both higher volt/wattage.
AND yes... I know the array mentioned is on a 2d plane BUT~ it can be arranged into a spiral as well.... just in case... I'm being stupid about the way the wires must cut the magnetic fields.
REGARDS
LLOYD
That said, i can understand getting annoyed and or frustrated by them.
SO~ to restart; Thank you Chuck for your forbearance so far, so perhaps better to explain a few of my *question experiences*......... and please don't take this the wrong way.... any of you.
FOR EXAMPLE ONLY;
i ask once if Chuck was aware of the Halbach array, a simple question~ yes/no.
RESPONSE;
I did look up the The Halbach Array as I wasn't familiar with it by that
name but am familiar with the effect. We do use multiple methods to modify
the magnetic fields within generators. The problem with permanent magnets is
that their strength is permanently set. Most of the time having the ability
to adjust the field strength is a great thing. If we have a source of torque
that is variable we can adjust field strength down so we are not robbing too
much torque. Of course our output varies with the torque and field strength
as well. In some higher output starter/generators they use interpoles to
control the warp of the magnetic field. Fig 79 on this web page shows the
interpoles. Normally the field runs straight from one main pole to the other
main pole, under high load the field rotates with the armature which causes
arcing at the brushes. the interpoles are reverse polarity so the tend to
push the magnetic field back to straight from main pole to main pole.
http://www.fastonline.org/CD3WD_40/CD3WD/ELECTRIC/GTZ021E/EN/B309_8.HTM
Another manipulation of the magnetic field noticeable in Fig. 79 is the main
field. The main N/S poles are right close to the armature but the case/frame
of the generator forms a guide for the flux to circle around back to the
opposite pole. Most cases are made of soft iron because of it's magnetic.
IT"S NOT~ that i don't want or need that degree of answer but that it confuses both me and the way i was looking at the possibilities i think i see in that Halbach Array.
FOR EXAMPLE:
The circular form of that array focuses the majority of the magnetic power within the circle, and i was wondering if , with that 4/6 pole arrangement one could not visualise it as a 4/6 pole magnet..... ONLY with the poles turned inwards rather than as with a permanent magnet facing outwards.
REASON:
A bottle generator(as on bike) spins a permeant magnet within series of soft iron shimes that have then a coil arranged around them, but below the shims.... resulting in a lot of friction and therefore both high resistance and low voltage /wattage.(rated normally at about 6v/3watts)
BUT~ with the Halbach array.... is it not possible if not preferable to have just one soft iron core with a coil wrapped around that.... and then spun... resulting if both higher volt/wattage.
AND yes... I know the array mentioned is on a 2d plane BUT~ it can be arranged into a spiral as well.... just in case... I'm being stupid about the way the wires must cut the magnetic fields.
REGARDS
LLOYD
