Kawai motor

[SkyWatcher]

Hi folks, i thought id start this thread on the kawai motor since i have not seen much discussion about it on any forum sites. I have built a crude replication of the Kawai motor however the air gaps were not close enough for good results although it did prove the principle works which is removing the attraction drag back to the ferro core as the rotor departs. I am also in the process of expanding the Garry Stanley air core type motor which will now have 3 rotors and 2 stator plates. As far as i am concerned this air core design performs the same function, that of eliminating back drag to core, understand im not speaking of lentz here just the natural ferro attraction. Also it seems another inventor has a similar design to the Kawai motor and that is the JakelJ motor. Now the information ive obtained on the JakelJ says it uses repulsion as well as attraction so it may be somewhat different but very similar. I am posting 2 pics, 1 of the kawai design and the other of the JakelJ design to show the similarities. At any rate i think the Kawai design deserves more attention.

peace, love, light

[ashtweth]

Thanks for starting this thread and doing this replication, after all isn't this the device which Tom Beardon says has nothing held out of the patent?, some where along the line if have heard that. If this is the case i think your replication should prove interesting.

Ash

[SkyWatcher]

Hi ash, I actually built the replication almost half a year ago and I've already gutted it for materials, wire and such so i was hoping others with better machines and such to build a more accurate motor or ideas to modify something existing would recognize the potential of this relatively simple Kawai motor design. Compared to Peters attraction motor which requires super tight air gaps the Kawai design would not require such perfection. However as i said right now im expanding an axial air core design which is based on Garry Stanleys design with 2 rotors sandwiching a stator plate although it will now have 3 rotors and 2 stator plates, this design since it has air cores has no natural back drag attraction and does not suffer coil deflection so in a way its similar to the Kawai principle. After studying motors in general ive come to some realizations that ive gleaned from this air core pulse motor, most typical pm motors use added energy to remove pole from stator and unloaded voltage built in coil on exit is reinforced particularly in commutated setups due to commutated coil polarity reversal which adds even more counter voltage to overcome when pulse is applied at next pole. So the efficiency boost in the Kawai comes from simply eliminating the wrestling match on exit by zeroing out the natural ferromagnetic back attraction to core. Bill Mullers motor aspect did the same thing and so does an air core if magnetic deflection is eliminated in the air core design.
Anyway thats why I think the Kawai designs simplicity is useful.

peace, love, light

[SkyWatcher]

Air-core motor unstoppable by hand

Hi folks, just thought id report on the air core motor ive enhanced. With the 12 total coils in series/parallel it has 1.5 ohms and 3 rotors with 6 neos per rotor. I am unable to stop the motor by hand with a glove on at 36V and it draws 2.2A with that load and still maintains good rpm. With an automobile steel flex fan with 6 blades it draws 1.27A at 36V and pushes alot of air. Also there is very liitle noticeable heat anywhere in the motor or transistor. I tried 60V with the fan load and drew 2.35A and moved large amounts of air. The gaps in this motor are not even optimized, there probably an 1/8" at all gaps. All i can say is this is the most powerful motor ive ever built. What ya folks think.

[Inquorate]

Thoughts

I've never built a motor, but it sounds good. Have you got video?

[SkyWatcher]

Hi inquorate, no i've never made a video of it before although i can, would a picture be of help otherwise i posted these results so people might decide how useful this design is. Of course its not the Kawai design as the thread title says but it is a very efficient motor and to be honest i could imagine this motor with bigger magnets more rotors and stators and closer tolerances and it could easily power a vehicle and give good torque and range. By the way im still testing different aspects of that other experiment, the generator effect where the coil is set back that allows a current to be drawn with no slowing down of the generator. I'm building a rotor to test an odd even setup like Bill Mullers although mine has a rotor on both sides of a coil-core in sandwhich config., im thinking for now along the lines of turning this generator with human power like a bicycle generator or wind power since when loaded it doesnt become harder to rotate although in future id like to mate this motor to it and see what we get.

peace love light

[gyula]

Hi folks, just thought id report on the air core motor ive enhanced. With the 12 total coils in series/parallel it has 1.5 ohms and 3 rotors with 6 neos per rotor. I am unable to stop the motor by hand with a glove on at 36V and it draws 2.2A with that load and still maintains good rpm. With an automobile steel flex fan with 6 blades it draws 1.27A at 36V and pushes alot of air. Also there is very liitle noticeable heat anywhere in the motor or transistor. I tried 60V with the fan load and drew 2.35A and moved large amounts of air. The gaps in this motor are not even optimized, there probably an 1/8" at all gaps. All i can say is this is the most powerful motor ive ever built. What ya folks think.

@Skywatcher

Hi, I have just noticed your posts on the air core motor and you seem to approach pretty well Garry's results. You are surely aware of his tests with his motor placed on a bike and run with a group of 12V batteries (96V total I think and around 1.1-1.2 Amper at his weight as load on the bike). Unfortunately he could not make a Prony break test separately from the bike, only a firm grip by his hand but he could not stop it either .
May I inquire what is the distance between two facing magnets? (N-S, right?)
And you also use parallel connected coil pairs like he did?

I think that in pulse motors like Garry's or yours the efficiency mainly depends on the number of coils and the number of magnets used: the more magnet pairs you use with a corresponding number of coils, the more powerful the motor becomes. It would be very useful if you could make a Prony test on your motor.

Thanks, Gyula

[SkyWatcher]

Hi gyula, the rotors are 3/4" thick mdf board so with that plus an 1/8" at each gap so thats 1" from north pole magnet rotor to south pole rotor, the magnets are 1" dia. x 1/8" thick neos stacked to make the 3/4" thickness. There are 6 coils per stator plate for a total of 12 and there are 6 paralleled pairs in series. I think i will test with a prony because this thing has good torque, i plan to mount in a cycle kart type setup one of these days.

peace love light