Q:What's the difference between a three-phase AC motor and a two-phase one?

The three-phase power is generally 380 pay, have four lines, of which three is the root of a FireWire, zero line; 380 volts of electricity is used as power industry; two-phase power is generally 220 volts, two lines, one of which is a FireWire, zero line is.220 volts of electricity is as electricity, or small machinery and electricity.

Q:When we replace dc drive with ac drive(ac motor having same capacity as dc motor) than there is alot of saving of power why? In dc drive only rectification take place where as in ac drive rectification and then inversion take place.

It depends on the size of the motor. If its a large motor, and 3-phase is available, AC wins. Small motors, where speed control is needed, DC wins (Induction motor speed control is possible too, but easier with a DC motor, just turn down the field current for more speed.). it depends on the motor/application.

Q:How much does 15kw power AC power consume per hour?

KW 1 hours of electricity is common sense, but there is a problem of motor efficiency and power, that is to say the motor to reach the rated value at full load working condition, if it is light load or no load may not every KW of electricity, if overloading or frequent start maybe more electricity. For reference only!

Q:I have a drill motor i was fooling around with and was wondering if i can use it as a generator? I thought maybe a wind generator. Its an AC motor and is magnetic. Were it has a lot of red wires and smooth steel were another piece can spin. Please let me know if i can and the best way to do it........Remember..................drill motor...AC motor...magnetic. Thanks in advance for your answers.

According okorder this forum has some good guys ready for help..

Q:Soooo... my outside condensor fan has started making this LOUD squealing noise... its like the noise you hear sometimes when it starts up... but it doesn't stop, and gets louder and Louder..like grinding metal.. and it only happens in the winter time when it gets below 45 degrees (F) or so... it works perfectly fine in the summer... The fan spins good and come on fine.. its just the noise..... So what i'm trying to figure out is ... is it the Motor.... or the Fan blades... because the motor is spinning the blades just fine...and with my research i found that when bad fan blades get wet they make a squealing noise..so i thought maybe the same applys with the cold...... or is it the motor with some bad barrings or something... any help??...thanks

First of all, your AC condensor outside should only have the fan come on when the AC is on, not when the heat is on, so why would it be coming on when it is below 45F? Usually the fan is mounted on and directly driven by the motor. Fan blades do not usually make a squealing noise when wet. Most likely the bearings have ran dry and at the very least need lubed. That it's been allowed to run like this for a while (presumably), the bearing may have worn enough that the whole motor needs replaced. Many fans today are considered permanently lubed but that is nonsense, they just don't put a lube hole in to save money and make people buy a new motor sooner. They just need pulled out, the through-bolts removed, and disassembled like this until you have access to the bearings or the felt oil reservoir rings to add a few (several, depending on the motor size) drops of oil. Standard 20wt motor oil, or even 5W20, 5W30, 10W30, etc will do in a pinch. If you have a legitimate need to run the A/C in the winter at 45F which I questioned above, then go with one of the thinner oils like 5W20. The only time the blades should/would squeal is if the nut that secures it to the motor shaft is loose and so the blade assembly is wobbling around.

Q:There were no dealer of solar panel here, so I decided to buy the solar board which will arrive by next week. How can I make the AC motor work if I can't connect the solar board to the AC motor directly?

Surprisingly, most AC motors will run off DC. If you have a solar array putting out a solid 100 volts DC with 10 amps behind it, you can run an electric drill. But no one, myself included will guarantee the results if you try. You take your own chances. I suspect that the solar board you ordered is not very powerful, so would probably not be able to power your motor. It takes several thousand dollars' worth of panels to power a 1 hp motor. If you post a link to the board you ordered, people may be able to help you more.

Q:Which is better, alternating current tubular motor and direct current tubular motor?

The advantages of DC motors (compared with AC motors) are: to achieve economic, smooth speed characteristics. And AC motor need to use inverter, electromagnetic regulator and other components to achieve this function.With the same power, the same speed (must be the same speed) compared with DC motor and AC motor, DC motor of the expensive price point, mainly because of its complicated structure must have "commutator" to achieve AC-DC conversion. This also increases the manufacturing cost of DC motors to a certain extent.

Q:The engine would be for a boat so another question i have is does anyone have any idea how to calculate or figure how many kw it would take to run a dc motor like that obviously it would not be running at 715 hp the whole time because that is only needed for acceleration. Thank you!!!!!!!

this must be a big boat. 715 HP converts to 533 kW by my calculator. Usually an electric motor can be smaller than an equivalent gasoline engine as it has a wider torque range. and now you see why electric cars are so difficult to make. If you used a 100 kW motor, 150HP, you would need hundreds of pounds of batteries to run it for an hour. 1 large battery has 1kw-hr of power. 100 of these would give you 100kW-hrs, enough to supply a 100kW motor for 1 hours. At a weight of maybe 2000 pounds.

Q:Whether there is any change if we give ac supply to a dc motor?

Nah, it'll be fine. Go for it.

Q:I want to put a quot;dimmer switchquot; (like the kind you put instead of a light switch to control how much electricity the circuit gets) before an AC motor running on 120 volts. Basically, we needed a motor for a project and it has a switch already on it for 2 different speeds of 600rpm or 1200 rpm (It was from a rather large industrial fan). I need it to spin slower and i was wondering if it will damage the motor to give it less voltage with the variable switch, or if the motor will run at all.Thanks in advance

I don't know about this specific motor, but in general AC motor speed is a function of the number of poles and the frequency. Thus lowering the voltage, by itself will not reduce the speed although you may see it moving slower because of the load. In these circumstances you are effectively slowing it down by overloading it and it will heat up accordingly. DC motors are a different beast and you can control their speed by voltage. Further, a dimmer switch does not reduce the peak voltage. What it does is chops off part of the AC waveform. Fundamentally, although this approach may do what you want, it is not a proper solution and I would not let it run unattended for any length of time. Also, keep a fire extinguisher handy.