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Re-Inventing The Wheel-Part1-Clemente_Figuera-THE INFINITE ENERGY MACHINE

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Lakes:
SMD Soldering tutorial.

http://www.youtube.com/watch?v=b9FC9fAlfQE

conradelektro:

--- Quote from: Lakes on November 07, 2012, 10:21:41 AM ---SMD Soldering tutorial.

http://www.youtube.com/watch?v=b9FC9fAlfQE

--- End quote ---

Thank you Lakes, you made my day, very good tutorial!

I looked a bit deeper into the stepper motor drivers:

In order to drive the two primary coils of the Fiquera Transformer one needs a very flexible stepper motor driver because the phases have to be driven differently to a stepper motor.

See the attached drawing which explains the difference between driving a Fiquera Transformer and a stepper motor.

What it comes down to: one has to be able to drive the two Phases at 180° (stepper motor needs 90°).

So far the only one which seems to be suitable is the DRV8834.

DRV8834PWP - DRIVER, MOTOR, DUAL H BRIDGE, 24HTSSOP
DRV8834PWP - TEXAS INSTRUMENTS - DRIVER, MOTOR, DUAL H BRIDGE, | Farnell United Kingdom

ADAPTOR, SMD, SSOP-24, 0.65MM
RE931-04 - ROTH ELEKTRONIK - ADAPTOR, SMD, SSOP-24, 0.65MM | Farnell United Kingdom

There might be many more stepper motor drivers which can be used, but look carefully. The two phases have to be driven at 180° for the Fiquera Transformer (and at 90° for a stepper motor). Many stepper motor drivers are fixedly set to a phase difference of 90°.

Driving capability of the DRV 8834: from  +10.8 Volt  to  -10.8 Volt , at 1.5 Ampere. This may be not high enough.

But one could use several pairs of primary coils and for each pair a DRV 8834 (all DRV 8834 ICs driven in parallel with the same pins of the microprocessor).

It may be, that I misunderstand the phase difference (in the two primary coils) necessary for the Fiquera Transformer. Whatever it is, 90° or 180°, one will want to try both (and therefore needs a driver that can do both).

Greetings, Conrad

conradelektro:

--- Quote from: rensseak on November 07, 2012, 09:20:53 AM ---Wie wäre es mit Ultraschalllöten? http://www.sonicsolder.com/
Wenn Du das mit der Hand löten willst, viel Spaß dabei. Primär gehts wohl darum, dass der Chip nicht durch Hitzeeinwirkung vom Löten beschädigt wird.
Ansonsten würde ich erstmal alle Füßchen von unten mit einer möglichst dünnen Schicht Lötzinn versehen. Anschließend auf die Platine legen ausrichten fixieren und nur noch mal von oben ohne Lötzinn festlöten. Bei allen Lötprozessen für ausreichend Kühlung des Chips sorgen. Hope you are german.

--- End quote ---

Danke für die Hinweise. Das Wchtigste ist wohl der SMD SSOP24 Adapter.
 http://at.farnell.com/roth-elektronik/re931-04/adapter-smd-ssop-24-0-65mm/dp/1426165

Conrad

kEhYo77:
I have found this dual H-Bridge driver:

L298N
- OPERATING SUPPLY VOLTAGE UP TO 46 V
- TOTAL DC CURRENT UP TO 4 A (2A per channel but you can parallel them for higher current output)
- LOWSATURATION VOLTAGE
- OVERTEMPERATURE PROTECTION
- LOGICAL ”0” INPUT VOLTAGE UP TO 1.5 V (HIGHNOISE IMMUNITY)

It will be easy to interface it with Arduino using a protoboard. There are Arduino shields available based in that IC as well, just Google it.

90 degrees phase (or any other angle) can be realized via software, just look for DSS (digital signal synthesis) Arduino code examples.
When I get mine working I will publish the code so stay tuned ;)

BTW. The core I'm using can be found in some PC power supply.

conradelektro:

--- Quote from: kEhYo77 on November 07, 2012, 07:52:50 PM ---I have found this dual H-Bridge driver:

L298N

It will be easy to interface it with Arduino using a protoboard. There are Arduino shields available based in that IC as well, just Google it.

90 degrees phase (or any other angle) can be realized via software, just look for DSS (digital signal synthesis) Arduino code examples.
When I get mine working I will publish the code so stay tuned


--- End quote ---

I hate to play the clever one. But I have to tell you, that the L298N is not useful. You can only supply one voltage to the coils (full step). It may be possible to implement a different phase shift than 90° (but I doubt even that).

The point is, that one can deliver at least 4 (better 8 or 16 or 32) different current strengths (voltage levels) to the two primary coils (that is the reason for the seven resistors when using a commutator). And in addition one wants to be able to vary the phase shift.

It is not so easy to do nicely what the commutator and the resistor bank is doing crudely in the original design. I spent many hours to look for the DRV8834. There are no easy short cuts if one wants to beat "commutator with resistor bank". With the L298N you will do much worse than with the commutator. You can only switch the coil on and of f. But you have to vary the current going through the coil from 0 to maximum current in several steps. I think that 4 current levels are the minimum. I would not do no less than 8 different current levels (to be better off than with the "commutator with resistor bank").

Greetings, Conrad

P.S.: I do like your three part transformer. I wonder if one could just take a Ferrite rod (or even a mild steel bolt) and wind the three coils next to each other? One will use low frequency (e.g. 50 Hz to 100 Hz) any way, so no fancy material for the core is needed.

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