Q:if i change voltage will the rpm of motor will be affected

I agree with the previous answer. Also, In an induction motor when you lower the voltage the current will increase to compensate and attempt to keep the motor running. With AC motors, in order to regulate the speed, one has to use a Variable Frequency Drive or VFD. The VFD can change the frequency, and hense, speed, in order to keep up with a certain demand. Often they are used on water pump stations and conveyor belts where the demand for product may change.

Q:Soybean milk machine AC motor or DC motor is good?

Ethanol is a flammable, volatile colorless transparent liquid at low temperature and atmospheric pressure. It can not be used directly because of its low toxicity and pure liquid;

Q:what is the connection of single phase AC motor rew and fwd?

In AC single phase motors to reverse the direction of rotation of motor, you have to reverse the direction of the magnetic field. To reverse the direction of magnetic field interchange the winding wires.

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.

the control panel which sends power to the motor can short out and double send power take plat off of the control panel there is like 10 wires all wire nutted together in a small area and some times come loose or the control panel its self could be bad

Q:Is it possible to add a speed control to this electric fan ? If so I will appreciate any quot; linkquot; with information of the kind of controller I may need. I need it running at variable speeds.

You need to specify the type of motor you are going to use. Every different type needs a different approach to speed control. If you want to use a universal motor then continuous speed control of a universal motor running on AC is very easily accomplished using a thyristor circuit, while stepped speed control can be accomplished using multiple taps on the field coil. In the case of synchronous motors you might not be able to change the motor speed. As for connecting the wheel. You might be able to use chain drive. Sprockets on both wheel and motor shaft and link with chain. Possibly you could use a belt. You would need something like a vee pulley on each.

Q:I know what a DC is. I think i'm sure about what an AC motor is, But what is an AC/DC motor and why is it different from an AC motor?

AC = alternatinc current thats the best i got bro sorry

Q:How can I change the alternating current welding machine into a DC welder?

At the output end of AC welding machine ~ ~ two terminals, one rated welding output voltage is greater than 2 times the no-load voltage, rated output welding current is greater than 2 times the output current of the rectifier.

Q:What are the advantages of AC motors?

Compared to the AC motor and DC motor, because there is no commutator (see DC motor commutation), therefore has the advantages of simple structure, convenient manufacture, relatively strong, easy to make high speed motor, high voltage, high current, large capacity.

Q:what is an ac motor? and what does it do?

Alternating Current - like comes out of the wall plugs. IN USA 60 cycles per second 110 volt (more or less). 220 volts if you use both legs. all household appliancs will have AC motors.

Q:From what I remember about AC motors, one cannot lower the voltage to slow it down- it must be the frequency that is lowered. However, I have an AC wall fan which slows down when the voltage in my house drops. Whenever a microwave or similar high-current load is on the voltage drops slightly and I always notice the fan motor slowing or speeding up when the load turns on and off. Why is it doing this? I am assuming that it is not good for the fan but seeing that it has been running this way for years it must not be that detrimental to it...

AC motors as the name implies is run using AC/alternating current.. this is best represented by a sinusoidal graph with time in the horizontal axis and voltage or current in the vertical axis.. motors uses the current to produce power which drives whatever it is that's attached to the motor.. power is directly proportional to either voltage or current.. because of this, low voltage/current produces low power and vice versa.. this is the reason why your fan slows down when voltage drops..