Hilden-Brand Magnet Motor

[MeggerMan]

Hi Mark,
I think Jack said he was using a De Prony brake, one example here:
http://www.geocities.com/koneheadx/measuringshaftpower.html
http://en.wikipedia.org/wiki/De_Prony_brake

Just a simple horsepower = Pi x 2 x lever len.(ft) x RPM / 33000

Input = 0.150 kW
Output 0.53 HP = 0.4 kW
Efficiency = 0.4 / 0.150 = 260 % at the drive shaft, so quite an achievment.

In comparison my Bosch electric drill is rated 0.55kW and produces 0.25HP (0.19 kW)
So that is 34 % efficient (may actually be a little better than this, but I've not tested it)

The 2" magnet is the diameter of the magnet disk, they are cheaper to buy as disks so I suspect Jack has to stack these to get a cylinder shape for the core of his valve.
The valve is probably about 3.4 to 4" diameter.

Regards

Rob

[Liberty]

Congratulations to you Jack.  I know that everyone is looking forward to your next post on the alternator/motor combination test results.  You have my best wishes for success with your motor alternator, and I find your test results very exciting and encouraging news.   

[MT]

-> Jack
Congratulations. 100% is already quite an achievement meaning losses are overcomed. Is there a plan to do also some press release? Maybe media will be listening with motor independently verified. I wish you success with the next important test.

-> Rob
Was playing with your implementation of Hilden-Brand transformer (I had to give it a name and tried different materials. For example using M47 steel gives excess flux of 237mT with current 0.014. It is interesting because M-47 has higher losses (if I'm correct) than M-19.
Attached is adapted scheme and text output from lua script.

I thinking to implement this on a real transformer body with cutted middle leg. Problem is still that jacket around the magnets. From possible jackets are only washers readily available. Do you or somebody else know what sort of steel are they made of? It would be nice to simulate it in FEMM to check behaviour.

regards,
Marcel

[MeggerMan]

Hi Marcel,
I went through all of the steel types last night and found one slightly higher than yours, I think it was 248mT excess, I will post the csv files when I get home.
I modified the lua script to create a csv file that can be loaded direct into excel with some titles, so it is easier to see the results.

The right materials are very important, some old washers made from iron will not work. Femm will show you that.
The laminations need to follow the flux flow, stacked washers are a hard path to follow.

I know making a core to fit around the magnets is going to be a nightmare.
The centre limb will need to "V" notch into the top yoke for a start as the flux lines need to follow the grain of the steel.
Also the outer legs need a 45 Deg mitre into the top yoke too, again so the flux lines can follow the steel grain.
On top of all this, the joints need to overlap, so you also need a steplap.

You have basically got to make a one phase transformer with a cylinder hole in the centre limb to take the magnet.


JackH,
Can I ask how you cut the hole in the laminations to fit the magnet into?
Or did you cut each lamination by hand?

Regards

Rob

[wizkycho]

-> Jack
Congratulations. 100% is already quite an achievement meaning losses are overcomed. Is there a plan to do also some press release? Maybe media will be listening with motor independently verified. I wish you success with the next important test.

-> Rob
Was playing with your implementation of Hilden-Brand transformer (I had to give it a name and tried different materials. For example using M47 steel gives excess flux of 237mT with current 0.014. It is interesting because M-47 has higher losses (if I'm correct) than M-19.
Attached is adapted scheme and text output from lua script.

I thinking to implement this on a real transformer body with cutted middle leg. Problem is still that jacket around the magnets. From possible jackets are only washers readily available. Do you or somebody else know what sort of steel are they made of? It would be nice to simulate it in FEMM to check behaviour.

regards,
Marcel

hi Marcel !

Laminations or granulated material are must in every part of these magnetic switching devices.

In solid setups when field is changing current is induced in every conductible part of device that is perpendicular to changable (strenght or direction) magnetic field. Just like it would in common coil. Unlike common coil which is not shorted, solid metal respresents short circuit so very high currents are induced that are creating strong opposing field that results in losses and requirements for more input... Can we use these eddy currents somehow ?

granulated material (bonded (with glue...) powdered metal) has lower saturation 0.6 - 0.7 T and to low permeability. Trafo Iron laminats 96%Fe 4%Si that you are going to use are good choice but my gosh "machining"... this material is just keep on running away. Maybe the best material for now is Vanadium Permedur 49%Fe 49%Co 2%V which is little
more expensive has much better magnetic characteristics and is easily machined...it can be bought as laminats.
going to buy some.

regards
Igor