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Slightly off topic - source for electromagnets — Parallax Forums

Slightly off topic - source for electromagnets

ArchiverArchiver Posts: 46,084
edited 2000-08-13 01:16 in General Discussion
My son is working on a micro-controller project at work and has a
need for about 25 small electromagnets that can be driven from the
micro (not directly, but through a power chip like a 754410).

He has been attempting to wind his own magnets without much success.
They must be about 1/2 inch in diameter or less. Can someone suggest
a source that might carry such an animal???

Thanks! You can reply off-list to cdavis@o....

Chuck

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2000-08-07 15:36
    At 12:13 PM 8/7/00 +0000, Chuck wrote:

    >My son is working on a micro-controller project at work and has a
    >need for about 25 small electromagnets that can be driven from the
    >micro (not directly, but through a power chip like a 754410).

    I had this same requirement last year. Couldn't find anything - ended up
    using the guts from a 12V solenoid and securing the 'plunger' core. This
    worked reasonably well, but it always seemed like a less than ideal
    solution. There are some very tiny solenoids around, should fit your 1/2"
    requirement.

    Best, Duncan
  • ArchiverArchiver Posts: 46,084
    edited 2000-08-07 16:24
    are you looking for a small size or small power? if it is small size withlarge "sticking" power then try amazing1.com: here······it also has books on how to make them if all else fails

    will

    orthner@sympatico.ca wrote:
    At 12:13 PM 8/7/00 +0000, Chuck wrote:

    My son is working on a micro-controller project at work and has a
    need for about 25 small electromagnets that can be driven from the
    micro (not directly, but through a power chip like a 754410).
    ·
  • ArchiverArchiver Posts: 46,084
    edited 2000-08-07 18:30
    Chuck, one suggestion:

    I have seen miniature relays with small coils, some with dual coils; it
    might be practical to dissect them.

    For what it's worth,
    Ray McArthur

    > He has been attempting to wind his own magnets without much success.
    > They must be about 1/2 inch in diameter or less. Can someone suggest
    > a source that might carry such an animal???
  • ArchiverArchiver Posts: 46,084
    edited 2000-08-08 04:26
    Good Source for 1/4" to 1/2" diameter with length from 1/4" to 5/8" is the
    driver heads in old Dot-Matrix Printers! 9pin(9Coils) 24pin(24Coils).
    Suggest source is local auctions and Garage Sales.
    Happy Hunting.
    Original Message
    From: Chuck Davis <cdavis@o...>
    To: basicstamps@egroups.com <basicstamps@egroups.com>
    Date: Monday, August 07, 2000 6:11 AM
    Subject: [noparse][[/noparse]basicstamps] Slightly off topic - source for electromagnets


    >My son is working on a micro-controller project at work and has a
    >need for about 25 small electromagnets that can be driven from the
    >micro (not directly, but through a power chip like a 754410).
    >
    >He has been attempting to wind his own magnets without much success.
    >They must be about 1/2 inch in diameter or less. Can someone suggest
    >a source that might carry such an animal???
    >
    >Thanks! You can reply off-list to cdavis@o....
    >
    >Chuck
    >
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2000-08-13 01:16
    Hello Chuck,

    My approach would be to purchase small, inexpensive electronic relays and
    remove the electromagnets from them. A good surplus electronics house would
    be my choice for this type of purchase. Common voltages include 6VDC,
    12VDC, and 24VDC. An easy way to energize electromagnets from a
    microcontroller is to use N-channel MOSFET's, just don't buy them surplus.
    Let me know if you need additional information, I will help if I can!

    Sincerely,

    Charles Page, President, Technology Electronics, Ltd.
    www.technologykit.com

    Original Message
    From: Chuck Davis <cdavis@o...>
    To: basicstamps@egroups.com <basicstamps@egroups.com>
    Date: Monday, August 07, 2000 8:14 AM
    Subject: [noparse][[/noparse]basicstamps] Slightly off topic - source for electromagnets


    >My son is working on a micro-controller project at work and has a
    >need for about 25 small electromagnets that can be driven from the
    >micro (not directly, but through a power chip like a 754410).
    >
    >He has been attempting to wind his own magnets without much success.
    >They must be about 1/2 inch in diameter or less. Can someone suggest
    >a source that might carry such an animal???
    >
    >Thanks! You can reply off-list to cdavis@o....
    >
    >Chuck
    >
    >
    >
    >
    >
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