F.B.D.I.S.S.M - Flux.Boosted.Dual.Induction.Split.Spiral.Motor.

[Honk]

Sorry, wrong of me. I was to fast and sloppy when calculating.
The motor has 6 poles and I excpect the motor to free spinn at least 2000-3000 RPM
If I hit 3000 RPM then this is 50 revolutions per second. 50 x 6 rotor heads = 300Hz
300Hz is still to high for any mechanical solution to be effective. Don't forget you'll have to move the magnets at least 2cm.
The solenoids would also cause a lot of noise while operating the magnets. A terrible thing to listen to.
Any mass movement unless being circular is a total waste of energy.
The highly advanced Supermalloy electro magnet solution is beyond question the best and most efficient way to go.
You must also consider that I must be able to design and build the motor myself.
The mechanical design you suggest is impossible to build in an simple and reliable, yet robust way.
The timing would be the most tricky part, and sensitive to any external influence, like vibrations and shock.

[Low-Q]

3000rpm should be a quite suitable speed. I suppose the electro magnet must be trigged with a connector that is turned on/off in respect of rpms. Fixed 20ms, or what your goal was to have the electromagnet turned on, is one complete revolution of the rotor at 3000rpm, so you have to make a mechanism that turns the electromagnet on for a much shorter time as the rpm increase. In the other hand, the inductance of the electromagnet will delay the current flow through the coil, when voltage is applied. Depending on the load this magnet is going to have, and the time it is turned on, the phase delay between current and voltage can be determind. If the load is too low, the delay will end up with a electromagnet that does not have time to achieve enough magnetic field to push the rotormagnet out of the sticky spot.

Just a tip on the way

Br.

Vidar

[Honk]

I guess you haven't downloaded and read the drawing and mounting instructions I have posted.
It tells which Reflex Detectors to use when determining the position of the rotor magnets.
They are very fast and can read the position within 25uS.

The delay times is no problem when using the Flip-Field Flux-Booster Controller I have designed.
I have estimated the delay charge of the coils to be less than maximum 300uS, perhaps a lot lower than this.
It all depends on how the controller responds to the rotational induction of the electro magnets.

The timing of the electro magnets vs the rotor magnets is the least of my problems.
It's timed by shifting the position detectors along the track opening in the top lid while running the motor at full load.

Thank you for your concern. / Honk

[ecc]

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[Low-Q]

Hi Honk.

I'm just wondering about how you are going to distribute the magnetic flux along each stator with that kind of shape. I wonder about this as you sure know that a smaller magnet which is approaching a long magnet are forced into the middle of the long magnet, and not necessarily forced to the closest end of it. What I mean is that the rotor magnet in your design in fact will deaccelerate before it reaches the closest end of the stator magnet, because the greatest magnetic attraction is not at the clostest end but some distance before it - however, not in the middle as the stator magnet is not in "parallell" with the rotation.

Hence, I think you have to add more energy to the electromagnet than calculated to force the statormagnet to pass that most attraction point to the stator magnets. Then you probably already have used that excess energy you, or Paul Sprain for that matter, are hoping for. Any thoughts about this problem - if it is a problem?

Br.

Vidar