Questions tagged [electric-machine]

Electrical Machines are Electro-Mechanical energy converters. They maybe classified into motors (electrical -> mechanical) and generators (mechanical -> electrical).

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1answer
348 views

Programmable power supply

I have been assigned to design a kind of programmable power supply. Can't decide on a way to make it. Need help with this. This is a high level block diagram of the required system: ...
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2answers
5k views

How to detect surges in the main AC

Electronics have a habit of breaking in my house. In the last 2 years or so, I had 3 desktops, 1 monitor, 4 cellphones going dead. They are not completely dead like they won't turn on. But in the case ...
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2answers
325 views

How does a large electric switch different from small?

Why do some electric appliances require to have a large electric switch to turn them on or off? If I use a small switch where a large switch is required, would there be potential possibility of ...
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2answers
890 views

Rotating Platform That Starts and Stops Incrementally

I'm not sure this is the right place to pose this question, as it probably encompasses more than one field - EE, ME, programming, etc. But I'll ask the question anyway and hope that someone might ...
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2answers
3k views

How do I modify a DC electric generator to get the same power at a lower speed?

This will be a theoretical question. Suppose that I have a DC generator, and I'm getting 300VA power from it when it rotates at 2000rpm. I want to make it run at a lower speed of about 700rpm, and I ...
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2answers
3k views

Which parts of this rotor can be made out of plastic?

I'm asked to redesign a rotor, by making as much parts of it as possible out of plastic. The issue is its weight, we want to make it as light as possible. Especially the shaft & axis of it is the ...
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1answer
707 views

What are power cube transformers?

If I'm not wrong, is the term "Power cube transformers" is less commonly used to refer "A.C/D.C Adapter"? I couldn't find the use to this term.
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3answers
8k views

How does electrical devices consume power?

I'm curious to know how does an electrical device can consume any amount of power it is required? Suppose the voltage here is 220V. How can you get any amount of electrical power say. 1000 watts out ...
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2answers
5k views

Dry, wet and free voltage contact?

I would like to ask about three kinds of electrical contacts: dry, wet and free voltage. ...
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3answers
549 views

Will a 3 phase induction generator fight its own rotation?

So in a 3 phase induction generator with coils for the stator and magnets for on the rotor, I am wondering if the the current induced in the coils would create a magnetic field that would oppose the ...

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