What is a VFT (Variable Frequency Transformer) and how does it work?

What is a VFT ?

The variable-frequency transformer behaves as a continuously adjustable phase-shifting transformer. It allows control of the power flow between two networks. Unlike power electronics solutions such as back-to-back HVDC, the variable frequency transformer does not demand harmonic filters and reactive power compensation. Limitations of the concept are the current-carrying capacity of the slip rings for the rotor winding.

All you have to do is look it up and have some know how of how a generator works of an understanding of asynchronous and synchronous which is applied in computer networks the basic theory never changes only the concept of the theory and how you apply this

Is a bit of joke really isnt it !! Its too easy

Same as your other question with reference balanced and unbalanced asymmetrical and symmetrical, synchronized and unsynchronized

All part and parcel of audio and computerized networks which can also be applied to power systems , rf systems Basic theory never changes

The present embodiments relate to a balanced-to-unbalanced transformer for converting a symmetrical high-frequency signal into an asymmetrical high-frequency signal. The balanced-to-unbalanced transformer includes two coil windings made of wire. The two coil windings are electrically insulated from each other and are wound on a winding form. Each of the two coil windings has an input at one end of the winding form for the symmetrical high-frequency signal and an output at another end of the winding form for the asymmetrical high-frequency signal. The two coil windings lie on top of one another in a radial direction of the winding form.
Claims:
1. A balanced-to-unbalanced transformer for converting a symmetrical high-frequency signal into an asymmetrical high-frequency signal, the balanced-to-unbalanced transformer comprising: two coil windings made of wire, the two coil windings being electrically insulated from each other and being wound on a winding form, each of the two coil windings having an input at one end of the winding form for the symmetrical high-frequency signal and an output at another end of the winding form for the asymmetrical high-frequency signal, wherein the two coil windings lie on top of one another in a radial direction of the winding form.

2. The balanced-to-unbalanced transformer as claimed in claim 1, wherein each of the two coil windings is wound substantially without spacing between adjacent turns.

3. The balanced-to-unbalanced transformer as claimed in claim 1, wherein the wire of one coil winding of the two coil windings is wound in parallel on the wire of the other coil winding of the two coil windings.

4. The balanced-to-unbalanced transformer as claimed in claim 1, wherein an inductor of each coil winding of the two coil windings has an inductance in the range between 1 μH and 10 μH.

5. The balanced-to-unbalanced transformer as claimed in claim 4, wherein the resonant frequency of resonant circuits that are formed by the inductors of the coil windings and parasitic capacitance between turns of the coil windings lie in a range between 10 MHz and 500 MHz.

6. The balanced-to-unbalanced transformer as claimed in claim 1, wherein the winding form has a length between 3 mm and 10 mm.

7. The balanced-to-unbalanced transformer as claimed in claim 1, wherein each of the two coil windings comprises 20 to 60 turns.

8. The balanced-to-unbalanced transformer as claimed in claim 1, wherein the wire of the two coil windings is an insulated copper wire having a diameter between 50 and 100 μm.

9. The balanced-to-unbalanced transformer as claimed in claim 6, wherein the length of the winding form is 5 mm.

10. The balanced-to-unbalanced transformer as claimed in claim 1, wherein the winding form is cylindrical and has a diameter between 2 mm and 10 mm.

11. The balanced-to-unbalanced transformer as claimed in claim 1, wherein the diameter of the winding is 4 mm.

12. The balanced-to-unbalanced transformer as claimed in claim 6, wherein the winding form is cylindrical and has a diameter between 2 mm and 10 mm.

13. The balanced-to-unbalanced transformer as claimed in claim 1, wherein each of the two coil windings comprises 40 turns.

14. The balanced-to-unbalanced transformer as claimed in claim 8, wherein the diameter of the wire is 80 μm.

15. A receiving device for a high-frequency signal for a magnetic resonance tomography system, the receiving device comprising: a balanced-to-unbalanced transformer for converting a symmetrical high-frequency signal into an asymmetrical high-frequency signal, the balanced-to-unbalanced transformer comprising: two coil windings made of wire, the two coil windings being electrically insulated from each other and being wound on a winding form, each of the two coil windings having an input at one end of the winding form for the symmetrical high-frequency signal and an output at another end of the winding form for the asymmetrical high-frequency signal, wherein the two coil windings lie on top of one another in a radial direction of the winding form; an antenna for wireless reception of the symmetrical high-frequency signal; and a coaxial cable for forwarding the asymmetrical high-frequency signal, the antenna being connected to inputs of the two coil windings, an output of one coil winding of the two coil windings being connected to an inner conductor of the coaxial cable, and an output of the other coil winding of the two coil windings being connected to an outer conductor of the coaxial cable.

16. The receiving device as claimed in claim 15, wherein the antenna comprises a loop antenna.

17. The receiving device as claimed in claim 15, wherein a preamplifier is connected between the antenna and the balanced-to-unbalanced transformer.

18. The receiving device as claimed in claim 16, wherein a preamplifier is connected between the antenna and the balanced-to-unbalanced transformer.

19. A magnetic resonance tomography system comprising: one or more receiving devices for a high-frequency signal for a magnetic resonance tomography system, each of the one or more receiving devices comprising: a balanced-to-unbalanced transformer for converting a symmetrical high-frequency signal into an asymmetrical high-frequency signal, the balanced-to-unbalanced transformer comprising: two coil windings made of wire, the two coil windings being electrically insulated from each other and being wound on a winding form, each of the two coil windings having an input at one end of the winding form for the symmetrical high-frequency signal and an output at another end of the winding form for the asymmetrical high-frequency signal, wherein the two coil windings lie on top of one another in a radial direction of the winding form; an antenna for wireless reception of the symmetrical high-frequency signal; and a coaxial cable for forwarding the asymmetrical high-frequency signal, the antenna being connected to inputs of the two coil windings, an output of one coil winding of the two coil windings being connected to an inner conductor of the coaxial cable, and an output of the other coil winding of the two coil windings being connected to an outer conductor of the coaxial cable.

20. The receiving device as claimed in claim 19, wherein the antenna comprises a loop antenna.

Read more: http://www.faqs.org/patents/app/20120262177#ixzz2hMlJbgTq

I should also add to this you need the maths or understanding of the maths as well otherwise the matrix maths wont make sence Thats simultanious equations etc solved with maths So you still have to know how to apply this with maths and still have to have maths to be able to do what? Correct Write software !! even the small stuff I put together and write sofware for I still have to use maths cant get away from it All en gineers , technicians , fitters , managers , directors have to have maths

No matter what you do question is why are britains univeristies doing away with Maths teachers then hmmm Good question huh Lets see what the government say to this one !!

Put another way who will you give preference too when choosing a new employee The ones that have failed RE and passed Maths or the ones that have failed maths and passed RE

Yes this is how stupid this gets !! apart form dropping its stench all over the place withs its idiotic idealogy before it wrecks annother few 1000000 lives and jobs and expects the country to support them

Lets ask the so called boffins in charge of the country who seem to think RE or religeous educations is far more important than Maths and english the internationally accepted langauge The langauge understood by all countries foriegn or otherwise Good to have other langauges but you do need english and maths unfortunatley

And it s does pay to have IT knowledge and also pays to be able to put together a database and it doesn’t really pay to simply rely on bespoke software because invariably your going to come against problems there as well you see and its also does pay to educate and invest in your own countries futures and it doesn’t pay to shut companies down who invest huge amounts of capital an it also doesn’t pay to take your hatred out on your workers who haven’t actually done anything other than what you’ve asked them to do also It doesn’t pay not to listen to those why can when you cant yourselves and it certainly doesn’t pay not to pay those people on time that’s of course if you want anyone left working for you at all


Its also pays to have numerous skills behind you such as technical drawing primitive or otherwise to e able to work with metal so mechanics comes into play also Art , web design , servicing both mechanical and electronic and electrical , also office environments and stacking shelves and cleaning and making sure you’re work areas are tidy Clean as you go And it pays to be able to weld , use a lathe , woodworking skills , fitting skills , building skills even make a cup of coffee , tea , work in a club , restaurant , painting and decorating , sweeping a floor In fact you name it even road works , mining , climbing , scaffolding , ladder work , first aid , knowing when where and how too , even down to using a firearm , explosives No matter what you think you can never be clever enough don’t let anyone tell you otherwise and don’t let anyone tell you cant You most certainly can right from the ground floor all the way no matter how hard they make it there is always a way Always !!!

Its also pays to have numerous skills behind you such as technical drawing primitive or otherwise to e able to work with metal so mechanics comes into play also Art , web design , servicing both mechanical and electronic and electrical , also office environments and stacking shelves and cleaning and making sure you’re work areas are tidy Clean as you go And it pays to be able to weld , use a lathe , woodworking skills , fitting skills , building skills even make a cup of coffee , tea , work in a club , restaurant , painting and decorating , sweeping a floor In fact you name it even road works , mining , climbing , scaffolding , ladder work , first aid , knowing when where and how too , even down to using a firearm , explosives No matter what you think you can never be clever enough don’t let anyone tell you otherwise and don’t let anyone tell you cant You most certainly can right from the ground floor all the way no matter how hard they make it there is always a way Always !!!

Вы говорите на русском языке, то


Not at the moment but I’ve met the women of my dreams Lovely women She is Russian very commanding just what I need and also will be very successful watched her watched how good she is Watched everything she does because she wants to be the best She will succeed and that’s what I admire that type of person will always inspire people always!! She tries , works hard , plays hard doesn’t have to be the best looking person in the world but then looks never are !!

It’s a women behind the man that makes a man


Just some general advice take that as you will !! All done in the best possible taste of course

xxxx

Have nice day !! Big smilies !! twinkle twinkle , Scintillate scintillate my charming diminutive asteroids

thanks a lot

A variable-frequency transformer (VFT) is used to transmit electricity between two (asynchronous or synchronous) alternating current frequency domains. The VFT is a relatively recent development, first deployed in 2004. Most asynchronous grid inter-ties use high-voltage direct current converters, while synchronous grid inter-ties are connected by lines and "ordinary" transformers, but without the ability to control power flow between the systems.
Variable-frequency transformer is a doubly fed electric machine resembling a vertical shaft hydroelectric generator with a three-phase wound rotor, connected by slip rings to one external power circuit. A direct-current torque motor is mounted on the same shaft. Changing the direction of torque applied to the shaft changes the direction of power flow; with no applied torque, the shaft rotates due to the difference in frequency between the networks connected to the rotor and stator.

Thanks!!!!