Q:the actual speed of a six pole a.c motor operating from a 50hz supply with a 6% slip is what?how do i work this out please

n=120f/p =120(50)/6 =1000 slip speed=0.06(1000) = 60 Actual speed= 1000-60 =940 rpm

Q:i want the difference in working operation at the rotor side as at synchronous motor rotor feeded by D.C current but at induction by A.C

I really like teressa's answer - very long and complete. In short synchronous motor's run in lock step with the rotating magnetic field produced by the AC field winding. There may be a phase difference - lead or lag, however the frequency with which the rotor spins is locked to the frequency of the AC power. Asynchronous motors run at a frequency not locked to the AC power, either faster or slower depending on whether power is being generated or used.

Q:I replaced a capactor on my blower motor with the same value as recommended on the nameplate. 5uF, 370VAC. It opened up after about a day, then I replaced it with another one and it did the same thing. I checked the value of the cap before installing and it was correct. The motor is rated at 9A, and I am getting a current draw of less than that.

Replace the blower fan motor. The windings are shorting. Check the motor case using a voltage meter--could be live.

Q:I noiced about 2 days ago that when I turn on the ac or heater on my car the blower motor in front of the passenger's seat starts to buzz and vibrate for like one minute and then it stops, I took it out yesterday and I didn't find anything stuck or nothing only that it had some dust, I revised the duct where it came from and found nothing unusual, what can be happening to it? Is it time to change it?

The bearings are worn out. Replace it.

Q:the motor was connected to three phase source but now I want to connect it to the single phase source how can I make this

1] If you connect the two lines of a single phase power feed to two of the leads on a 3 phase motor it will not run and will burn out. 2] Your ONLY choice is to make 3 phase. 3] You can do that two ways; one is to get a VFD

Q:Our motor went out a week ago. I bought a new one and my friend replaced it. It worked about 5 minutes and the cool air came on and then the fan just quit again. Is it hooked up wrong? Did we ruin the new motor? Is there another underlying cause????

the difficulty your experiencing is due a mixture of a foul condenser fan motor and grimy coils. call your community provider organization for a restore and that they gets u up and going good away as Your problem is a basic one and the provider guy would have the climate on his truck. the completed restore ought to fee around $250 for all factors and exertions. and could take an hour and 0.5 to end... possibly evaluate a upkeep contract as some companies grant discount rates whilst u sign in for one

Q:I have been tasked with building something called a yarn quot;carderquot;

and you can use the search web line to openscroll === how to make an electric yarn carder

Q:ok, it is a 1977 old motor home, the kind that looks like a van in the front but has a over cab bed area. so it is about 15' long and about 7' wide. It sits in the Arizona sun all day long and right now it is close to 110 degrees. so how much per month does this raise my electric bill?it is not very insulated and is being lived in so it is running alot.

I doubt a AC that size will keep the home cool in that climate, so it will run continuously. Look up the current or wattage of the unit. It will be about 600 watts or 5 amps. The next thing you need is the cost of electricity in your area. Guessing at 10? per kW-hr.. 600 watts x 24 hours/day x 30days/month = 432000 watt hours or 432 kW-hrs/month 432 kW-hrs/month x $0.10 per kw-hr = $43 per month. .

Q:Whats the difference between induction motor and synchronous motor?

The basic difference between an induction motor and a synchronous AC motor with a permanent magnet rotor is that in the latter the rotating magnetic field of the stator will impose an electromagnetic torque on the magnetic field of the rotor causing it to move (about a shaft) and a steady rotation of the rotor is produced. It is called synchronous because at steady state the speed of the rotor is the same as the speed of the rotating magnetic field in the stator.

Q:How is the speed of an AC motor varied? How is the speed of a DC motor varied?

The most effective way to vary the speed of an AC motor is to change the frequency using a variable frequency drive (VFD). Speed is proportional to frequency. If the frequency is reduced below the normal frequency, the voltage must be reduced proportionally. If the optimum voltage is maintained as frequency is reduced, constant torque can be maintained to a very low speed. The frequency can be increased somewhat above the normal frequency at constant voltage with loss of torque to maintain constant power. The speed of a DC motor is varied by changing the armature voltage. Speed is proportional to armature voltage. If the field is maintained by a separate power supply or by using permanent magnets, constant torque can be maintained. Speed can also be controlled by changing the field current. Reducing the field increases the speed.