Controller circuit for Hilden Brandt motor needed..

[aladinlamp]

Yes an airgap can be though of as a resistor, so a 0.01 mm airgap is way better then 0.1mm
The valve will switch with less effort.

Hi
how many times bigger machine than your's will be needed to build, so it's airgap 0.1 mm will have same effect as 0.01mm in small machine.

Thanx

[JackH]

Hello All,

The larger the air gap between the rotor and the cores, the less power it uses.

Later,,,,,Jack

[armagdn03]

First, Armgdn03 if you are viewing this your knowledge is needed!

This is to clarify what was said or should have been said to wattsup offline?..keep in mind I am no expert, I just like knowing all facts. 

Inductance

?Inductance is the characteristic of an electrical circuit that makes itself evident by opposing the starting, stopping, or changing of current flow.?

Self-Inductance

?When the current changes, the magnetic field changes, and an emf is induced in the conductor.  This emf is called a SELF-INDUCED EMF because it is induced in the conductor carrying the current.? 

Inductive Kick

?It has been shown that an inductor in which there is a changing current becomes a source of EMF, and that the direction of this EMF is such that it tends to oppose the change in the current producing it.  As a result of this action the current in the inductor does not rise to its full value the instant the switch is closed, but rises at a rate which depends on the L/R ratio. ?

From this we observe that a certain amount of time is required before current flowing through an inductor reaches its finial steady state.  This time period is governed by the ratio L/R (Inductance/Resistance).  It said that after an interval of time (5L/R) current has reached its finial steady state value. 

Ex.   T = L/R
        T= 30/1
        T= 30 seconds

Steady state value equals :

t =  5L/R = 5T

Where t = elapsed time, in seconds
Therefore:  steady state will be reached in

5 * T = t
5 * 30 = 150 sec

Now this example is taken from a book so don?t pick a fight with me if you don?t agree!  The example my book provides is totally over exaggerated, as no one will ever use 30H coils in their motor designs.  The point is that one must be mindful of the steady state time!  If you are using points which connect your coils with the source you must ensure that the coils are allowed to remain in contact with the source till steady state is reached, otherwise you have a coil which is not being used to its maximum potential.

Points systems should be engineered to adapt to varying motor speeds.  Speeds will vary as load conditions vary.  Loading the motor or generator will increase the amount of time that a coil is connected to the source, not good!  This in my opinion is why a properly designed PWM circuit is superior to points, as the amount of time that the coil is connected to the source can be fixed, and or adjusted by the operator.   Some may still argue that points are better as they are not subject to catastrophic failure like integrated circuits are.  In response to this I say comprehend how the circuit will (must) behave, and design accordingly.  Although high voltage transients do kill solid state circuits, bad circuit planning is the true culprit!

Armagdn03 opened my eyes to a world I knew existed but didn't fully comprehend, I invite him to correct my oversights, and add where ever he sees fit.


Regards

This is an interesting thread indeed! I commend all on their work here and wish the best.
Thank you Erfinder for a more than flattering introduction, lol.

What you have posted is completely correct. What should and usually is taken into account when designing such systems is not only functionality, but also maximal efficiency. Take for example duty cycle, which is prevalent in point systems, as Tesla and many other pioneers have shown. Both inductors and capacitors have a time constant associated with them meaning that based on certain variables it takes a certain amount of time for them to "level off" if we cut off power before this point, we are wasting power! Also, if a condition of resonance is to be attained, the off cycle must match accordingly in order to reach resonant rise. If there is too much "dead" time in between pulses, we reach a point where the oscillations stop, there is dead space, and then they start again, when in reality we want one set of oscillations to lead into the other. Perhaps this is going beyond what is trying to be accomplished here, but dont ignore it, always room to take it to the next level.

[wattsup]

@armagdn03

Welcome and h ope you are well.

@Nali2001

Got an idea that may be good for these motors.  Variable commutator.

1) You can use two of your black timing disks stuck to each other and have one with a screw that enable you to make the active band wider or thinner.

2) You can have three or four commutators on the same shaft having each a different timing and just switch the brushes from one to the other.

3) You can have three or more sets of points on the same shaft, all having different camshaft frequencies. This could also have a centrifugal mechanism that automatically pushes on only a single set of points, to move it farther down or back on a varying camshaft.

Instead of using a PWM circuit and struggling with the flyback barbecue, just keep it as straight as possible by moving a variable commutator. This way there is no circuit between the coils and the battery so flyback can land back safely, and the question of less contact at higher frequencies will be resolved.

Just an idea from your friendly neighborhood OUer.

[ceres]

@Jack,

In response to your last post regarding air gap dimensional optimization, correct me if I am wrong; so the air gap dimensions need to be adapted to the whole system and contrary to general intuitive belief you say there is no merit in the idea that the smaller the gap, the better.

On the contrary, you say, the bigger the gap the less energy needs to be put into the coil, so maybe I am wrong, you might say there is a range of optimization for the airgap.

The smaller the airgap the higher the electrical energy input, at a certain airgap range you reach optimum COP, after that range, the bigger the airgap the higher the electrical energy input again?

Does your statement confirm the graphs in the Ogino Sanshiro US patent 6369479, page 6 and 18?

Could this also be an explanation of the phenomena seen in Nali's motor design and videos? No extra torque nor substantial lowering of current drawn when permanent magnets are added.

Keep on repeating, Jack, you have been one of the few, capable of producing a COP > 300%, even the best and brightest did not manage and will never manage because of arrogance. Keep on repeating time and again these kind of phrases, spirits up!!!@#$%! The better World is watching you and is expecting you to come back!

Best wishes, best health improvement,

Ceres