Q:my AC unit at home is not working. I called two companies and they are giving me different quotes and fixing different things? Apparently the motor is not working, but one wants to replace quot;fan motorquot; and quot;blower wheelquot; and he quoted me $1450; another company said he needs to replace the quot;blower motorquot; and the bill for that would be $800. Both of them said the fan/motor aren't working and the unit does sound wrong when it's running.... but why are they recommending changing different things? The first company already charged me $200 for changing the capacitor, and that worked for a few days, but now i'm being told that it's the fan that's not working.... help please.....

Blower Motor Fan

Q:I've heard that hair dryers with AC motors are better then dryers with DC motors. Why? Is it just because they last longer?

OD gave you a very good advantage disadvantage list as for hair dryer! HMMM! AC motors are 3600 RPM maximum, for sure it will last much longer than DC motor that can go 10 000 RPM or more but would not be able to deliver the air flow Anita

Q:a motor that runs on ac and dc?

Mostly, if they have a lot of power in a small package (especially for rotary speed), but are used only sporadically. They often are a bit noisy. If they have a speed control, then they could be universal.

Q:I have a smaller box fan with a quot;stuckquot; motor. When the motor is off I can freely spin the blades but as soon as I power it up it becomes MUCH more difficult to turn, as if the motor started acting like a giant electromagnet.Any idea what is wrong?

Call a repair man, sounds like the motor is shot. Keep messing with it and you could burn your castle down.

Q:How can I control the RPM of an industrial motor of 7 horse power? I need it to have high torque and low RPM, like 100 per minute.

*For stepless control of AC motor, you need to have a VFD [variable frequency drive]. Basic equation is: RPM=120*frequency/no. of poles here,no of poles are fixed for your motor and 120 is constant. So, to control the RPM you have to change the frequency. 100/120=frequency/no of poles 0.83 =frequency/no of poles check the no of poles of your motor and put in the above formula,you will get the frequency. #Example A 4-pole motor that is connected directly to 60 Hz utility (mains) power would have a synchronous speed of 1800 RPM: 60*120/4=1800 If the motor is an induction motor, the operating speed at full load will be about 1750 RPM. If the motor is connected to a speed controller that provides power at 40 Hz, the synchronous speed would be 1200 RPM: 120*40/4=1200 #A variable-frequency drive (VFD) is a system for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor. A variable frequency drive is a specific type of adjustable-speed drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-speed drives (VSD), AC drives, microdrives or inverter drives. Since the voltage is varied along with frequency, these are sometimes also called VVVF (variable voltage variable frequency) drives. #Adjustable speed drive (ASD) or variable-speed drive (VSD) describes equipment used to control the speed of machinery. Many industrial processess such as assembly lines must operate at different speeds for different products. Where process conditions demand adjustment of flow from a pump or fan, varying the speed of the drive may save energy compared with other techiques for flow control. Where speeds may be selected from several different pre-set ranges, usually the drive is said to be adjustable speed. If the output speed can be changed without steps over a range, the drive is usually referred to as variable speed.

Q:i want motor specification which will meet this requirement ..plz help me

I think you would be better off using a dc motor. but not knowing what your trying to do (how much torque/ Hp or application ) , it is near impossible to suggest anything..

Q:Can a DC series motor operated on an AC supply?

An universal AC/DC motor is series wound, so a series DC motor will probably run on AC, but if it was designed specifically as a DC motor rather than a universal, performance might suffer.

Q:Can someone please explain to me the difference between an AC motor and a DC motor, but in a way that a non-technical person can understand? Not saying it has to be completely dumbed down - just want to have the light bulb go off. Thanks.

Dc Vs Ac Motor

Q:Hi, I was wondering how to connect my FASCO model K628 motor to a AC power plug. It says: brn- commonblk-208v Red, Orn,Orn 230v Its my first time doing this, and I'm really confused Thanks!

This is a single-phase motor for use on either 208 volts or 230 volts. You need either a 208 volt or a 230 volt source. For 208 volts, connect one hot wire to the brown motor lead and the other to the black motor lead. Tape the Red, Orn, Orn lead so that the bare end can's touch anything. For 230 volts, connect one hot wire to the brown motor lead and the other to the Red, Orn, Orn motor lead. Tape the black lead so that the bare end can's touch anything.