electromagnet sweeper

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I plan to make an electromagnet sweeper but my understanding of
electromagnet field very basic. The sweeper condition should be
operate by cut off DC supply to release the nails and etc and the
piece load of metal about max 200 - 300 gram with range of magnetic
field about 500 mm

My question :
1. Any impact of diameter of wire to field of magnetic ? If yes how is
corelation
2. Same question with no.1 but for diameter of pole
3. If I use AC generator and recifier, is there any circuit needed to
protect the wire and bar get burn ?
4. What's should be the best of metal use as pole for application of
heavy duty.
5. To bring more magnet effect, can I apply more layer of wire on each
pole ?
6. To cover the magnetic surface wider, can I put paralell bar ?

Thanks and appreciate your coment.

Regards,
Zul

 

[D from BC]

I plan to make an electromagnet sweeper but my understanding of
electromagnet field very basic. The sweeper condition should be
operate by cut off DC supply to release the nails and etc and the
piece load of metal about max 200 - 300 gram with range of magnetic
field about 500 mm

My question :
1. Any impact of diameter of wire to field of magnetic ? If yes how is
corelation
2. Same question with no.1 but for diameter of pole
3. If I use AC generator and recifier, is there any circuit needed to
protect the wire and bar get burn ?
4. What's should be the best of metal use as pole for application of
heavy duty.
5. To bring more magnet effect, can I apply more layer of wire on each
pole ?
6. To cover the magnetic surface wider, can I put paralell bar ?

Thanks and appreciate your coment.

Regards,
Zul

I have time to answer 1 question..

Magnetic intensity depends on magnetizing force H. H depends on turns
and current. As wire diameter goes down, wire resistance goes up and
can reduce current for a given voltage.


D from BC
British Columbia
Canada.

 

[Robbo]

I plan to make an electromagnet sweeper but my understanding of
electromagnet field very basic. The sweeper condition should be
operate by cut off DC supply to release the nails and etc and the
piece load of metal about max 200 - 300 gram with range of magnetic
field about 500 mm

My question :
1. Any impact of diameter of wire to field of magnetic ? If yes how is
corelation
2. Same question with no.1 but for diameter of pole
3. If I use AC generator and recifier, is there any circuit needed to
protect the wire and bar get burn ?
4. What's should be the best of metal use as pole for application of
heavy duty.
5. To bring more magnet effect, can I apply more layer of wire on each
pole ?
6. To cover the magnetic surface wider, can I put paralell bar ?

Thanks and appreciate your coment.

Regards,
Zul

Use this circuit with no batteries
http://en.wikipedia.org/wiki/Magnetic_base