Questions tagged [ac]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
0answers
32 views

Issues with Building AC Generator

So we are trying to build an AC generator, an alternator, if you will. We are using a 5" PVC pipe for the body with a hole drilled diametrically, through which a bolt passes. Inside of this pipe, on ...
2
votes
1answer
43 views

Calculate amount of evaporative coolers needed to cool down an area

I have a task to create a software that calculates how much evaporative coolers are needed to maintain a certain temperature in a given room. I need to create a simple form, where variables are next : ...
1
vote
0answers
28 views

Breakdown voltage of electronic devices

Diode and transistor have reverse breakdown voltage. Are these devices permanently destroyed under such voltage? Also, do these devices have breakdown voltage when AC voltage is applied? How much AC ...
-2
votes
1answer
51 views

Which Generator is “Better”: DC or AC? [closed]

So, I have a project where I have a bicycle that powers a type of generator. I have everything else done, but I need to pick a generator. My first problem is that I don't really know which type of ...
2
votes
1answer
46 views

Are there any variable frequency drives that work digitally?

By this I mean can any DC to AC variable frequency drives invert digitally (no moving parts) and if so how do these work? Is this possible for both sine and square wave inverters?
2
votes
0answers
71 views

What is the maximum frequency of an AC current?

I saw that the rpm of a synchronous motor is proportional to the frequency of current alteration and I was wondering if there is a theoretical maximum frequency (regardless of magnet strength)? Also ...
0
votes
3answers
54 views

Increasing speed and efficiency of ac induction motor

If you wanted highest efficientcy and speed from an AC motor what would you do? Could the rate of alternation of current be optimizes? More windings? Materials? More lamination? Other factors I haven'...
2
votes
1answer
284 views

Mechanically increasing RPM of ac induction motor

If you spin the stator of an AC induction motor than would the rotation of the rotor increase? Or would it have a different affect such as moving with a higher force?
0
votes
1answer
55 views

AC induction motor

Could the rotor be shaped like a fan inside the stator of an AC induction motor. And could the stator act as a duct. Would this lead to a high airflow:materials used. Thanks
6
votes
1answer
557 views

Is a 3 Hz beat frequency from my neighbor's HVAC a sign of a malfunction?

I'm being annoyed by a pulsating hum which comes from my neighbor's HVAC system. I read up a little on the design of HVAC systems and I came to a tentative conclusion that what I'm hearing is a ...
-3
votes
1answer
755 views

How to convert VDC to VAC at a high frequency? [closed]

How to convert 10 VDC to VAC at a high frequency, say 10 MHz? VACpp can be +-10V or +-5V.
1
vote
1answer
53 views

Will AC Motor Maintain Speed of Descending Object

Suppose we have an AC motor which needs to lower an object at a set speed. We use a PID loop to determine and correct positional errors. Presumably the PID loop will keep the current low as most of ...
2
votes
3answers
3k views

How does single-phase AC synchronous motor work?

In a recent question of mine about microwave plates, jpa correctly identified the type of motor used for microwave plates as a specific variant of AC synchronous motor, equipped with gears that reduce ...
9
votes
4answers
13k views

Does a transformer use power when output isn't under load?

I was reading about how AC to DC converters work with a step-down transformer and then a diode bridge to convert the lower, stepped down AC voltage into DC. What I don't understand is since the input ...