Cam shaft sensor (speed sensor) => broken magnet - Page 2
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  1. #11
    Senior Member Pim205GTI's Avatar
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    If you want John you can send the magnet to me and I will run some tests :




    Quote Originally Posted by murrayf View Post
    the system is a hall effect
    It's not a hall effect sensor. Just a magnet and a coil
    Golden Boomerang Wheels Rock



    CX500TC - summerfun

    VF750F

    CBX1000 - exploded in garage

  2. #12
    Senior Member johnste1960's Avatar
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    Quote Originally Posted by johnste1960 View Post
    Actually, with the break, each becomes two individual magnets. If you try to put them together the same way on say a wood table, they repel each other at the break acting like a S-S pole or N-N pole. If you force the two together, you still get a dipole magnet with one end of the piece being north and the other end being South. I found some info on the internet (if you can beleive that) from someone who seemed to be in the know that explains some sort of pole reversal. Personally, I have yet to understand this.

    I am an electrical engineer at an aerospace company and it brought about quite the discussion at work today. While electricity and magnetism are closely related, The courses I had many many moons ago (basic physics) either did not get into this sort of thing or I simply do not remember, LOL.

    Supposedly, I read on the internet that the magnetic strength of two magnets put together this way is 1/2 of the strength of the original magnet. If you want to take two magnets like this and get more field strength, supposidly you are suppose to put them together top/bottom versus side/side. Please do not have me explain it, this is what I am reading. Being an engineer, I am compelled to try to understand it deeper, LOL

    PIM205GTI states that the north south pole are going plate to plate, To be honest, that is something I did not condsider. I have to think about this. This may help explain and make me better understand the observations I am seeing.

    In any event, it is nice to know the magnets are the same as in the goldwing. This will give me more sources to check.

    I actually dd a short litte test on the table away from the metal plate. If you take one of the halfs and rotate it 360 degrees, both magnets repel each other all the way around the circumference. If you flip one of the magnets, they attract all the way around the circumference. I am pretty confident now that PIM205GTI is correct in that the N/S bole are thru the thickness of the magnet running metal plate to metal plate. My GUT feel is that these would still work if you put them back in.
    Current Bikes: cx500t1, cx500t2, cx500t3=UK version, cx650t 1979 CBX zx750E1 (750 turbo#1), zx750E2(750turbo#2 -parts bike but planning to completely rebuild), zx750E1(750turbo#3 -high performance build, shooting for 150HP), 1973 H1-500, 1974 H1-500, 1974 H2-750, 2014 BMW K1600GTL-Exclusive, 1984 Honda Interceptor 1000:blob10:


    Previous Bikes: CB500T, 1974 Kawasaki 900 z1, 1989 Yamaha Vmax, 2008 HD soft tail custom

  3. #13
    Senior Member johnste1960's Avatar
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    Quote Originally Posted by Pim205GTI View Post
    If you want John you can send the magnet to me and I will run some tests :






    It's not a hall effect sensor. Just a magnet and a coil
    ************************************************** ********************
    That looks totally like the test setup I was envisioning, LOL The only dif was I was thinking about running my drill press to drive the rotor.

    PM me you address information. I found some Gold wing sensors based on the information you gave me. If I do not see myself getting the time to run the tests myself, I will send the broken magnet to you. I am very curious what the outcome would be.
    Current Bikes: cx500t1, cx500t2, cx500t3=UK version, cx650t 1979 CBX zx750E1 (750 turbo#1), zx750E2(750turbo#2 -parts bike but planning to completely rebuild), zx750E1(750turbo#3 -high performance build, shooting for 150HP), 1973 H1-500, 1974 H1-500, 1974 H2-750, 2014 BMW K1600GTL-Exclusive, 1984 Honda Interceptor 1000:blob10:


    Previous Bikes: CB500T, 1974 Kawasaki 900 z1, 1989 Yamaha Vmax, 2008 HD soft tail custom

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  5. #14
    Senior Member edinlr's Avatar
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    I rest my case, of course Pim would offer to test the magnets - he lives for these kinds of problems. Pim, I wish you would consider moving to Arkansas so you could help me diagnose all of the problems with my bikes!
    CX500C
    CX500T
    CX650E
    CX650T
    Hawk
    CB750 w/turbo
    RG500
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    Kawasaki 750 Turbo
    Katana 1000
    Ducati 749R
    Screaming Eagle Road King
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    Ninja H2 1000
    & a dozen battery chargers

  6. #15
    Senior Member Rayman's Avatar
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    ok the magnet is a bias magnet that sets up a magnetit field between the pole piece (around which the coils is wound) and the timing rotor - which is steel and not itslef magnetic.
    when the rotor is further away the field through the pole / coil is lower - when the rotor comes close the field becomes much stronger - its this changing in field strength that induces the voltage in the coil and generates the trigger pulses.

    on the broken magnet - stick them back together - with a touch of good epoxy if you like - it will still be the same.
    the magnet is a collection of small magnetic domains - all the way down to the atomic level - they are just all lined up together to produce a cumulative total.
    when you divide a magnet it does NOT suddenly develop another pole : youve just exposed another pole that was already there -
    MMF ( magneto motive Force) is directly equivalent to EMF( electro motive force ( or Voltage)) - so if you like think of it like batteries in series.

    stick it back together - carry on and worry about more important stuff - like wheres the next beer ?

    HTH

    Regards
    Rayman
    Ignition Modules and other stuff
    www.rae-san.com


    cx500A - grey - commuter (phantom) SOLD
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    vf750s - fiddler - vf1000f forks, ignition trail, 4into1, pods, clip ons, dual headlights etc
    next cx - cx500 in 650 frame with undertail pipes and lots of changes - almost done



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