Alternator

You can run an electric motor from the alternator if they're the same voltage, etc., but if you're thinking that you can use that motor to turn an alternator whose output turns the same motor, you can't.

MMay i know y

Because it would take two alternators instead of one to no other benefit than more components to look at to turn the same diesel over for a start.

Usually the second alternator is replaced by a battery for means of energy storage for the next start.

Since 'the only game in town' still implies a choice (you can play, or you can sit at home), I prefer the following description

1. You can't win.
2. You can't break even.
3. You can't quit.

Succinct and unambiguous.

You try to make a perpetual motion machine, an 'over-unity amplifier,' or free energy:

Not guilty.

Sorry, the second part of that was for the OP.

One word...

Losses.

Alternator has two outputs:

1. Mechanically as motor starter

2. electrically as battery charger/electrical supply.

Which output do you want to connect and why?

What?!!

Never mind! Did I really say that? Its on par with the posed question!

You may. You have my full permission. Come back here when you can't get it to work.

What is your question?

We apparently have several problems here:

1. Translation problems from one language to another: The word order of your sentence does not make sense in English. Why would you connect a diesel engine to a motor? This implies that the diesel engine is applying power to a motor, but a motor is a device that is intended to use electricity to produce rotation. The starter motor does just that, but for only a short time, until the diesel engine is running, and producing far more power than the motor.

I suspect that what you want to do is to use the diesel engine to run the alternator, and use the output of the alternator to run the motor. That is exactly what diesel 'gensets' do. There is no reason why not, as long as the diesel engine produces more power than the alternator requires, and the alternator produces more power than the motor requires to do its assigned task.

Find someone whose NATIVE language is English, but also speaks yours, and have them help you translate your questions into correct English.

2. Possible generation gap problem. Most of the regulars here are either semi-retired or completely retired. Most of us mature folks do not appreciate incomplete words and incomplete sentences. As at least one other person said, f u cnt wrt fll sentences, u r be'n lazy! Ask correct questions using complete words and sentences, and you are much more likely to get an appropriate answer. Don't try to use a phone as a substitute for a computer!

3. As Jraef said, losses. Every device that transforms energy from one form to another wastes some of that energy. That's why I said the engine must produce more power than the alternator needs, and the alternator must produce more power than the motor needs. At least a couple of the replies prior to mine think that you are trying to use the output of the motor to run the alternator, and use the output of the alternator to run the motor. That would be impossible, due to the losses (mostly in the form of heat). Even if you could somehow eliminate all losses, which you can't, you still would not have a useful device. If you tried to get that imaginary 100% efficient motor to do something useful other than spin that imaginary 100% efficient alternator, there would no longer be enough power to keep the alternator spinning, and the system would collapse.

Cn U rite n cmplte wrds plz?

It wll sho U hve a brian.

Whn U rite n leet, it mks us wnt U 2 DIAF.

Jst tryn 2 hlp U owt.

kthnxbai