Are Motor Amps and Volts Adjusable or Fixed?

Hello Guest,

You are intending an highly unusual unit.

There is some confusion with your questions, because of how they are listed.

You refer to output of a motor, but the output of a motor is mechanical, not electrical.

A.) <"If I buy a 5000 watt motor, can I regulate it to one day put out 5000 amps x 1 volt and then another day regulate it to put out 5000 volts x 1 amp?">

In that question the 2 options you give are exactly the same, no change.

B.) <"Can I buy a 5000 amp x 1 volt motor?">

Yes, it will be very expensive, and to special order, if you can locate a maker.

C.) <"I'm needing DC output but I don't care if it's originally AC and then rectified.">

Once again, I believe you are misunderstanding between the:

1. Motor = mechanical output
2. Generator = DC Output
3. Alternator = AC Output

If you could reply, and advise which unit you intend to use = Motor or Generator or Alternator, and the intended use for such a unit, then we are better able to assist.

1. Please advise the speed of the Motor, if it is actually a Motor.
2. If a Motor, advise whether output is to be Rotary or Linear Motion.
   
3. If an Alternator, advise Single or 3 phase please.
4. Climatic conditions for the unit would be helpful.

The assistance would be more helpful, if you advise your location, to minimise Search time.

Thank you for your reply, with....

Kind Regards....

Hello again original Guest.

I misread the first question, and gave you an incorrect part answer.

In which your two options were the reverse of one another NOT the same as I said in my earlier Post:

<"If I buy a 5000 watt motor, can I regulate it to one day put out 5000 amps x 1 volt and then another day regulate it to put out 5000 volts x 1 amp?">

The answer to that part of your question, is really No.

Please don't be discouraged, we all are still learning.

I trust you will learn more about the interesting field of Electrical and other Engineering, plus many more subjects.

Kind Regards....

Thanks Sparkstation and PWSlack. I can see from your answers that you've raised more questions than I can respond to so I'm going to admit I'm out of my league here and drop out because I have no idea what you are talking about. I need a bit more basic education before I can go on but I would like to thank you for taking the time to reply anyway.

Please consider experimenting along the lines of the final bit in reply #2, as it will provide some of the insight needed.

Every motor in your case the 5000 watts motor is sold for a designed operating voltage,and expected normal operating current, ambient temperature, and a permissible maximum operating temperature.And within these limits onlyVoltage and current are interdependant to some extent.

You have the choice of operating your motor in these limitation only.A motor can not be expected to perform at more than the normal supply voltage variations and permissible design standards.

To get a proper answer to your question, you have to share your proble in more details.

The post asks: "...If not, if as I suspect, amperage and voltage are somehow permanently fixed by the infrastructure of the motor, what are the factors that dictate the voltage and the amperage in a motor? Can I buy a 5000 amp x 1 volt motor?"

The factors boil-down to the cross-sectional area of the wire and the number of turns in each pole (coil) in the motor. The magnetic flux produced is a function of the (coil's) AMPERE-TURNS. 1 amp flowing thru 80 turns = 10 amps flowing thru 8 turns, etc.

A 220v motor having 150 turns of 18AWG magnet wire per coil could be re-wound using 75 turns of wire having twice the cross-sectional area (15AWG, I think?) and it would then run essentially the same as before but drawing twice the current (amps) at 110v.

Who on earth would want a 5000 amp 1v motor...!?! Engineers go to school to learn the most LOGICAL ways to approach a given need, don't they?

Please don't start throwing stones for that last remark til I'm outta range...!

The 5000W DC motor it's an approximately 6.5 HP. Assuming that the manufacturer recommends a normal operating voltage of 100VDC at a rated of maximum 50A up to 45-50 degrees C ambient working temperature, you can connect the motor to a power source which delivers 1V/5000A in which case the motor might even not make any one turn; so nothing bad will happen. But, if you connect the motor at 5000VDC, which exceeds 50 times the operational manufacturers recommendations, and you really want to see what's happening, be prepared with the fire extinguisher to protect the environment from burning too.

You have to look on the curve

there is a minimum energy you have to supply to make the motor run, that minimum corresponds to mechanical and magnetic losses.

A motor will never run with 1 volt et consum 5000 amps

you can built a motor for 5000 v , but you probably will not consume 1 amp.

In all the cases the motor must be or DC motor or AC motor monophasique or universal, or be three phases motor.

The maximum voltage is fixed by the insulation, and the maximum current is fixed by the section of the wire.

You fix the limits when you build your motor and the limits fixed will , with some other physical characteristics fix the power you will get and the speed;

For AC motors the speed will depend of the frequency of the current because the important thing when you build a motor is the power or the torque you get

It might help if you tell us what you actually want to achieve. You will probably find that the solution to your problem will not require the strange motor configuration you mention, rather a standard supply with a variable rectifier stack of some kind based on triacs/IGBT's or something similar.

it is imposible. not may be might be or special design. Because there is any wire has "zero resistence" until very low degrees . And assume there is one discovered(or cooled) and therefore the voltage is not reduced by resistance effect(V₂=V_in-deltaV). Now we have 1V within the coil windings which will cause EMF needed. And now we stuck this step no way to overcome the ferromagnetic losses. There will no force remain after losses with 1V.

it is good for brainstorming(but more then this it is nonsense).The users who gave probabilities that it may be done ever seen 5000A before ?? its induction voltage on any surface of motor will count much more than 1V !!!

In any motor DC or Ac the voltage nad amperage are decided at the design stage.You cannot play around keeping the watts (OrKW) constant and vary volts or amps.Now do u know what is it to handle 5000 amps at 1 V?

I suspect the question it more of a learning question than a practical question.

The basic answer is no. You cannot vary the voltage and current over such a large range in any practical motor. There are ways to vary the speed and power output from a motor, but I'm not sure that was the question. It is easier to vary the speed of a DC motor than an AC motor. There are two basic types of DC motor, series wound and shunt wound. They both have different characteristics. A third type combines both and is called a compound motor. AC motors are much so more complex, I see no point even going there now.

In theory, voltage multiplied by current gives power. As a practical reality you cannot simply change voltage and expect the current to automatically adjust itself to give the same power. Conversly, you cannot adjust the current and expect the voltage to automatically adjust itself to give the same power.

Ken