Connecting a car alternator ...

Renewable energies except solar electric or thermal (seeforums dedicated below): wind turbines, energy from the sea, hydraulic and hydroelectricity, biomass, biogas, deep geothermal energy ...
titiyador
I understand econologic
I understand econologic
posts: 119
Registration: 26/01/09, 21:03
x 2

Links




by titiyador » 28/04/09, 13:01

Hi everybody,

I enclose the links of my first tests which certainly go back to a little while, this machine is on stand bye, because I am blocking on the realization of a voltage regulator, which I do not wish to buy, because the cost is too high in all done.

I priced myself, you'll see a remark and I'm sorry I didn't link you, although I think I gave one or two in another forum of the site. The machine has changed quite a bit, in fact, the rudder is not the same and the blades have exploded, so I had to redo others.

Sorry for forgetting the links!

Chao.

The links:

http://www.youtube.com/watch?v=eH9psCBqmd4
http://www.youtube.com/watch?v=oY6JfbBABgs
0 x
He who sows the wind harvest ... happiness !!
DIY
I discovered econologic
I discovered econologic
posts: 3
Registration: 18/08/09, 21:14

The VRDM 5913/50 LNB is a 5 phase motor




by DIY » 19/08/09, 00:17

Hello

. . The VRDM 5913/50 LNB is a 5-phase motor, there are 10 wires so each phase has 2 wires, which allows it to be connected in 5-branch star or 5-sided delta!

. . I don't see what you want to do with a three-phase transformer or 3 single-phase transformers, you have to forget sorting and switch to penta, it's the new fashion; I just happen to have a penta motor on my desk, from VEXTA, it is 0,72 ° per step, because it is a stepper motor, and it gives practically nothing as current when turning it, unlike 2-phase motors which give very well, on the other hand in motor it goes. Not having tried the BERGER-LAHR 5913, I don't know what it looks like, but have you noticed that no manufacturer gives the power of a stepper motor, it is a bad sign to use it in energy conversion, a direct current motor of known power, e.g. 1,5kW is more certain to give us the same power in electric current, for example running a wiper motor of a large vehicle will give in the 100 watts.

. . On the other hand, stepper motors can be used as speed and direction sensors (after decoding), and 2-phase ones are sufficient.
. . To run a five-phase motor, it is not easy, you have to program a PIC in assembler, or take a three-phase transformer and calculate windings which are out of phase, there is a risk of making a mistake in the phase angle angles and it is necessary that the 5 voltages are identical but it is difficult because all the windings do not have the same number of turns so you have to correct the wire diameters to compensate a little. Let's say that winding is simpler than programming a PIC, but we will have a sort of synchronous motor, of fixed speed, for 50Hz, it will rotate at 5 revolutions per second instead of 50, as there are 500 steps per revolution, which makes 300 revolutions per minute.
Good night!
0 x
Alain G
Econologue expert
Econologue expert
posts: 3044
Registration: 03/10/08, 04:24
x 3




by Alain G » 19/08/09, 00:34

brico wrote:
but have you noticed that no manufacturer gives the power of a stepper motor, it is bad sign to use it in energy conversion, a dc motor, of known power


The voltage and the wattage capacity depend on the speed of use. if you run faster at higher voltage you can use it with more watts, conversely if you run faster as a generator for a higher voltage you will draw more watts.
:D
0 x
DIY
I discovered econologic
I discovered econologic
posts: 3
Registration: 18/08/09, 21:14




by DIY » 19/08/09, 12:02

Alain G wrote:brico wrote:
but have you noticed that no manufacturer gives the power of a stepper motor, it is bad sign to use it in energy conversion, a dc motor, of known power


The voltage and the wattage capacity depend on the speed of use. if you run faster at higher voltage you can use it with more watts, conversely if you run faster as a generator for higher voltage you will draw more watts.
:D


This is only true at low speeds, see page B2-A of the Leroy Somer industry catalog, out of 5 motors there are only 3 which have a linear behavior, and which is limited to 3000 rpm therefore the using above is dangerous. And I see that this manufacturer specifies exactly the power according to the conditions of use of its direct current motors with or without magnets.

. . .. And apart from having fun looking for the difficulty, I see no point in using a stepper motor to make electrical energy, because it is not optimized for that. You have to do efficiency measurements to see if it can give something like an 80% efficiency that would be comparable to the usual solutions, it's like rewinding a car alternator, without doing any performance measurement before and after modification. may have no interest. Who proves that it is not worse than before?

. . The technique is not bullshit, it is MEASUREMENT, the first thing is to establish measurement procedures and equipment to measure the powers, to quantify the results, otherwise it is to ACKNOWLEDGE that it there is NO RESULT.

. . Some salespeople are often criticized for not being able to announce the results of what they are selling, so the handyman should not fall into the same trap.

. See you and good luck in your constructions.
0 x
DIY
I discovered econologic
I discovered econologic
posts: 3
Registration: 18/08/09, 21:14

Principles of manufacturing a wind turbine




by DIY » 19/08/09, 13:07

Hello,

. . To make a wind turbine, you have to be logical, the wind has an energy that varies roughly as the cube of its speed, and the area used by the propeller varies as the square of its radius. But all this assumes that the propeller is 100% optimized each time for all wind speeds, and in addition that the electricity generator is also optimized. All these very important variations mean that if we make a wind turbine with fixed characteristics, it will be bad. It will therefore be necessary, willy-nilly, to automate variations in parameters (orientation of the blades, excitation of the dynamo), which can only be done by a microcontroller.

. 1. The choice of the dynamo is important: no magnets, which allows to vary the excitation, therefore the load, as on cars.
For example, I could take the MF100 motor which has a maximum power of 2,1kW at 3.000t / minute, and which has a very linear characteristic, so no saturation, its maximum excitation current is 315mA. its power is 1kW at 1500t / minute.
. 2. The propeller, 2 blades 1,35m long should give 1kW
At 60km / h of wind, it would turn around 160rpm.
. 3. The gear multiplier should have a ratio of 1500/160 = 9,4, which can be achieved with a planetary gear for example.
. 4. The regulation system would use a Peak, to act on the orientation of the blades, and the excitation, so as to extract the maximum power in the small wind speeds, and to protect the machine in the event of high wind, while it retaining its maximum production power, here of 2kW
DIY
0 x

 


  • Similar topics
    Replies
    views
    Last message

Back to "hydraulic, wind, geothermal, marine energy, biogas ..."

Who is online ?

Users browsing this forum : No registered users and 268 guests