Particularly note the two crescent slivers because of the magnet face radius being bigger than the blank radius non-coherent centres. .
(It might realign but it will never regain its strength.) Such a art 4 slot scooter motor would be rejuvenated by loto du 04 o8 2018 zapping its magnets.
Typically this saturates the blank to its maximum magnetized state.
Quad Pole (Multipole) Magnets, multiple poles are used to further increase the focussing and alignment of the magnetic field to where it will do the most good.Call and book your party today.Next machine the V either side the gap in the middle should be as small as possible obviously it cant be zero but 1-2mm would be nice however your zapper may not be powerful enough to wrangle the zapping flux through this reluctance, so start.The iron slug may be a simple best fit round bar or a dual radius profiled slug (the inner radii do not share a common centre).It will also interfere with the zap.This can generally be done in a number of ways: 1) For the coil type (shown above the can and magnets (without endbell nd armature) with a core plug between the magnets is placed into a non-magnetic (plastic) holder to secure the assembly in the middle.The focussed field motor ran to 67,500 RPM.5v so it was marginally faster unloaded.Since your zapper will have limited power we want to get as much out of this as possible so use high permeability iron, make the non-concentric outer radii to suit (the best fit diameter is less than optimum here but you can do that for.You can approximate a radial magnet by using a butterfly shaped conformal core slug which is also suitable for multiple poles, as hsown below.In the RH drawing the material to be removed is shaded in green.Clearly there is yet another trade off at work here as to how much focussing is beneficial to the trade off loss of overall magnetic field strength.It also tends to drag the field out of line, displacing and unfocussing it you may notice the effects of this in a motor that has gone off the boil for no obvious reason.Usually the pole pieces focus down to the blank and the tips conform to the shape of the blank (re: earlier comments about air gaps being bad news to magnetic circuit strength) typically clamping the blank in place with no clearance whatsoever.However using the simple flat faced poles (normally as supplied with the zapper) and a simple iron core tends to focus the magnetic field at the expense of the outer edges being less than fully saturated this will also happen in a coil type zapper.What has happened is that the magnetic field has realigned itself while sitting idle.Worse, a pair produced in two goes may have field misalignment and focus problems so its safer to do magnets as matched pairs.Feel free to do it again but I dont approve.At this point the blank has no magnetic field.If you are new to the sport, see our Starter Sets in each section.
Magnets Magnet Zapping, magnets are made by sintering various materials into shape (materials such as ferrite, nickel, iron, neodymium, boron, samarium, cobalt, etc.) Sintering lady gaga poker face zippy consists of first mixing these materials as a very fine powder (consistency of talcum powder) followed by compaction into a die.
Above photo plain and focussed zapping core plugs standing on a graph of back to back motor trials which show no significant difference in output power.
Below a typical slot car zapper note plastic holder for the motor can (axle side North up).
More on this later.