# Electromagnetic Machines

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#1
For my course (OCR B) I need to learn about the following:

- The action of a dynamo: change of flux linked produced by relative motion of flux and conductor

- The action of a motor, including a simple induction motor

Now, im quite confused after reading my book about the above two. Theres a lot of names floating around: generator, motor, d.c. motor, alternating generator, dynamo isnt even mentioned in the textbook once.

So can anyone briefly explain what machines these terms are describing and im guessing some of the above are the same things (just with different names) because those two bullet points are the only things mentioned on my spec about it (attached page 44 if you want a broader look to understand)

- electromagnetic forces; qualitatively as arising from tendency of flux lines to contract or interaction of induced poles

Whats that last bit all about, im not sure there either - it doesnt seem to be explicitly mentioned in the book so im not sure if ive covered what they mean there?

Thank you for taking the time to reply; greatly appreciated!

Spec: http://www.ocr.org.uk/Images/74952-specification.pdf
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#2
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7 years ago
#3
(Original post by newblood)
For my course (OCR B) I need to learn about the following:

- The action of a dynamo: change of flux linked produced by relative motion of flux and conductor

- The action of a motor, including a simple induction motor

Now, im quite confused after reading my book about the above two. Theres a lot of names floating around: generator, motor, d.c. motor, alternating generator, dynamo isnt even mentioned in the textbook once.

So can anyone briefly explain what machines these terms are describing and im guessing some of the above are the same things (just with different names) because those two bullet points are the only things mentioned on my spec about it (attached page 44 if you want a broader look to understand)

- electromagnetic forces; qualitatively as arising from tendency of flux lines to contract or interaction of induced poles

Whats that last bit all about, im not sure there either - it doesnt seem to be explicitly mentioned in the book so im not sure if ive covered what they mean there?

Thank you for taking the time to reply; greatly appreciated!

Spec: http://www.ocr.org.uk/Images/74952-specification.pdf
Oldies but very well presented (even if a tad un-PC !)

http://youtu.be/obP1TQh1e2w

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#4

Cheers,i seem to be largely fine with all the magnetic flux theory though.

Its how it is used in dynamos and motors that i need help on. Do you have any resources (like those links perhaps) that clearly explain how they work in terms of magnetic flux etc. My own searching has proved fruitless

I just need to get my head around that and i should be fine. Nonetheless thanks for taking the time to show me these. I really appreciate it.
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7 years ago
#5
(Original post by newblood)
Cheers,i seem to be largely fine with all the magnetic flux theory though.

Its how it is used in dynamos and motors that i need help on. Do you have any resources (like those links perhaps) that clearly explain how they work in terms of magnetic flux etc. My own searching has proved fruitless

I just need to get my head around that and i should be fine. Nonetheless thanks for taking the time to show me these. I really appreciate it.
The very first link I provided is explicitly clear. You need to watch it for the first 10 minutes.
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#6
(Original post by uberteknik)
The very first link I provided is explicitly clear. You need to watch it for the first 10 minutes.
Ok cheers!
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