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May 11, 2024, 04:26:15 am
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Author Topic: Difference between permanent field magnets with electromagnet field coils?  (Read 512 times)  Share 

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HarveyD

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Difference between permanent field magnets with electromagnet field coils?
« on: August 06, 2011, 11:12:05 pm »
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Is there any difference between a motor with permanent field magnets and one with electromagnet field coils?
There shouldnt be right?
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Lasercookie

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Re: Difference between permanent field magnets with electromagnet field coils?
« Reply #1 on: August 06, 2011, 11:25:05 pm »
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Wikipedia sums it up pretty well.

http://en.wikipedia.org/wiki/Electric_motor#Permanent-magnet_motors
http://en.wikipedia.org/wiki/Permanent-magnet_electric_motor#Permanent-magnet_motors

(Brushed DC Electric motors would be what we study right?)
http://en.wikipedia.org/wiki/Electric_motor#Brushed_DC_motors
http://en.wikipedia.org/wiki/Brushed_DC_electric_motor

The differences are really what I'd call practical differences.

There's the obvious difference in that they have to be built differently. They mention stuff like permanent magnet motors can't be adjusted, therefore no speed control. Brushed DC electric motors can suffer from friction, as the brushes need to press against the commutator. etc.
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HarveyD

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Re: Difference between permanent field magnets with electromagnet field coils?
« Reply #2 on: August 07, 2011, 12:09:13 am »
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ah k, thanks for that

btw would you happen to know why moving the coils of a transformer further away reduces the EMF?
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