builders board > Cyril Smith AKA Smudge builders group
Smudge’s Halbach motor
Smudge:
--- Quote from: Floor on November 10, 2020, 09:19:43 PM ---hope this isn't off topic.
The neo. magnets must be forced into the magnetic field at the start of the
ramp. Input = output
floor
--- End quote ---
Wrong!! Magnetic fields are not conservative, although in most experiments they seem to be. In the modified Halbach array the magnetic pole passes through field regions where it gets a driving force, the magnet gets accelerated. So along the array it sees a series of force impulses. The field at each impulse has the same magnitude, there is not an ever increasing magnitude. The energy to enter that array is determined by the field magnitude at the first impulse point. The total energy obtained is determined by the length of the array and the number of impulses, so a long array yields maximum energy gain far exceeding the energy needed to force the magnet into the array. The pole movement through each impulse is somewhat like electron movement around a single turn in a transformer secondary. Have more turns and you get more induced voltage even though the circular E field remains the same magnitude. The multiple impulses act like multiple turns while the H or B fields have the same magnitude.
Smudge
synchro1:
A toroid with arc magnets that opened a circular slit toward the center to permit an axled traveler to attach to a rotor arm would work. The traveler needs to be a siamese disk. NS/SN.
skywatcher:
The general problem with simulations is that simulations are based on known laws of physics and these laws don't allow things like 'overunity'.
If there is such thing like a magnet motor it must be based on 'exotic' effects which are NOT included in the models of any simulation software.
There is only one way for verification: build and test it.
I strongly doubt that ANY construction consisting only of passive elements (permanent magnets) is able to show 'overunity'.
Jimboot:
I've already started the design on my build. Anyone else?
tak22:
I have enough magnets to start a build but would prefer to hear from Smudge on his further musings and thoughts on my questions before starting and investing in more magnets.
--- Quote ---I did try simulating a single circular array with the working side facing inwards, but that did not show the same effect as a linear array. In that arrangement the change from linear to circular took away the wanted effect. However I am still looking into this simpler arrangement to see whether I can get it to work.
Smudge
--- End quote ---
--- Quote ---In your alternate linear version of the Halbach array your FEMM results were improved by using a permeable material such as Fe inplace of certain magnets. Could you do the same for the circular array using square magnets and wedge shaped transitions between either a few of the PMs or all? There's also the option of 'squaring the circle' by using a polygon of linear segments, but it might add complexity to the radial magnet, or not.
tak
--- End quote ---
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version