uhm.. am i the only one that did d math or what??

lies

wirinet:

I have never attempted power regeneration, but I think it involves trying to recover some energy from system that acquired some potential or even kinetic energy. For example when a car is going down a slope, some of its potential energy is converted to electricity using gears and alternator.


You will require a generator or alternator rather than a motor. Generators perform the reverse of motors. Some motors can act as generators, but they end up being very inefficient, and this probably explains why you are getting very poor output of electricity.

I have thought of attempting such a project and it was a car alternator that came to my mind. The problem with car alternators is that you need high RPM to get sufficient power from them.

If you are really serious about the project, you might need to order low RPM generators from alibaba or aliexpress, the type they use for wind turbines. They are very efficient and can work with as low as 100 RPM (revolution per minute).

I did some research and discovered that these low rpm "generators" are just motors whose output speeds were reduced with gears to get higher torques. They just did some rewiring and repackaged them as generators (generators and motors work on the same induction principle anyway).
They seem to be relatively efficient because the speed on the shaft (which is now input) gets amplified because of the gears. But in truth they are not efficient at all

For instance, in a typical motor spec sheet you will see rated input voltage and current as well as rated output speed and operating torque. This helps you calculate the efficiency of your motor under operating loads (IV=Tw*efficiency).

The generators/alternators/dynamos i see only give you information about the speed required to produce a certain voltage and the rated power of the motor. So in the formula IV*efficiency = Tw, the torque or mechanical power needed to generate the speed in general is ommited.

There're basically saying we dont care how you get that rpm and we dont want you to know how efficient our motors are, just give us the speed and we'll give u this voltage. Even big car manufacturers of alternators hide effieciency info

Ill just have to buy anyone that produces some voltage from my speed and hope for d best

wirinet:

Ok, all power supplies work on fairly standard principles, with minor differences here and there. I asked a friend and showed him the capacitor, he told me the capacitor is just a boost capacitor. I am guessing the capacitor is used to regulate voltage in place of a choke. He said the capacitor should not affect the power supply much and the tv should still power on. I changed the fuse, and it went bang with sparks. I have traced that the power IC is also burnt. That must the issue causing the short circuit. I intend taking the power supply panel to Oshodi tomorrow to get the power IC changed or buy a new power board altogether.

Hope that solves your problem.

Can you help me with this project im working on?
It involves regeneration. My question is which motor is the most efficient for power regeneration? Im working on a project where a gearbox is involved and i want to convert that mechanical power to electrical power. From my analysis, the max power in the output shaft is about 30W at. 2400rpm. I heard dc motors have a very low efficiency in regeneration. As low as 10% at that speed (even the geared ones) This means i can bearly power an led. What are my other alternatives. Do you know their efficiencies in regeneration?

wirinet:

Oya all you electrical engineers, prove yourself. I need you guys help. Just this morning, my generation blew out my TV. My wife heard a loud bang from the TV. When NEPA brought light a few mins ago, I put on tv and it did not come on. On opening the cover of the TV, I found the Fuse and capacitor blown. I could not make out the type and value of the capacitor. So you power engineers on this thread, help me with the type and value of the capacitor below, so I can go looking for it.

Did i forget to mention that i not a pro power electronics guy nor electrical guy for that matter. Was just giving my input. Cant help you much here. No vex.
But im sure whoever can help will need more details about the tv like model name and such..

wirinet:

You are correct. Obviously you are an electrical that understand beyond what you cram in textbooks.

My main premise once again is transformers work on the principle of induction which is a function of voltage fluctuations. I have never argued that current in a closed or loaded circuit do not alternate or fluctuate. What I am trying to explain to electrical engineer Simplyleo is that the current fluctuations is because of voltage fluctuations and not vice versa. Voltage has an inverse relationship with current, so if voltage increases, current reduces to maintain the same constant which is power, which is the main reason electricity is transmitted with high voltage and then stepped down in your homes.

I am not an electrical engineer, so I might not know the complex mathematical equations, but I understand the practical hands on aspects, because I have built and designed small power circuits.

I understand where you were coming from. You actually explained it many times and i agree.

wirinet:


Since you said I should use Google, I will. Maybe you will understand what I am trying to say.

The main crux of my argument is that electromagnetic induction, which is the principle which transformers work is a function of voltage, EMF or Potential Difference, and current is a natural consequence of voltage. Voltage is stored up energy, current is the actual amount of that stored up energy that's being used.

You can have voltage without current, but it's impossible to have current without voltage.

Yes, induction is a function of voltage. But if you read further down in that article you will see that to increase the voltage produced you need to increase the magnetic field strength while keeping the speed constant. This involves more force. And force is related to current in electromagnetism by the relationship F=kti. Here power is increased

This therefore means, at constant power, if the magnetic field strength (force/current) was increased, the relative speed would be reduced and hence the voltage. (P=IpVp)

Summary
You were right theoretically about no power when talking about transformers but only in an open circuit situation where there is no resistance. voltage can still be computed
NsVp=NpVs

Also when current is passing because of either the resistance of the wire or load in general and hence power, these formulas apply
IsVs=IpVp
NsVp=NpVs
You're both right, one is just talking about open circuit and the other is talking about in a closed circuit situation

Correct me if im wrong

mansakhalifa:
And the mauling has started.

This match is exactly what it is- a mismatch. It is like sending out a troop of amateurs to take on a team of 11 pros. It's always gonna result in total annihilation.

A large chunk of this S/Leone team play in the Sierra Leone National Premier League. It's largely amateur at best. They can only do so much.

Besides, I hear the Sierra LeoneanLeague has been on hiatus since 2019- pretty much like our own NPFL. That means the players on the SL side haven't been getting a whole lot of game time lately.

We also have to factor in the quality aspect.

I would be damned if this game doesn't end in a 6-nil bashing. Or 7-nil...

4!

This didnt age well

A

V

Please how is cheki pricing for dealers. Am asking for a startup dealership company. I cant seem to get that info anywhere Anyone pls

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