Why not an electromagnet motor?

[Wingman0121 10+ year member]

That way you can vary motor strength from funky pup to DDZ x10, it'll use electricity just to work but who cares.

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[helotaxi 5,000+ posts]

The main reason would be that you have a finite amount of electricity available in a car. Another reason is that there is no reason to vary motor strength. The final reason that is if you change the motor strength, you change the parameters of the sub which means that the enclosure that was good for one motor strength is totally wrong for every other. Bottom line: pointless.

 

[snoopdan 5,000+ posts]

In the 1920's and 1930's electromagnetic speakers came in home radio sets.

http://designium.co.za/images/Electromagnetic-speaker.jpg

 

[JimJ 5,000+ posts]

Field coil //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Wait a minute, I was beaten to something old...

 

[ahole-ic]

The main reason would be that you have a finite amount of electricity available in a car. Another reason is that there is no reason to vary motor strength. The final reason that is if you change the motor strength, you change the parameters of the sub which means that the enclosure that was good for one motor strength is totally wrong for every other. Bottom line: pointless.

In addition to those reasons: Another reason is probably cooling. Right now the voice coil wastes 90+% of all energy put into it and it is converted to heat. We get away with this because #1 it is AC, relatively low current, and #2 the coil is moving and getting cooled off.

With a traditional motor design you have a fixed magnet and a coil moving in and out of its magnetic field. To replace the permanent magnet with an electromagnet, you would have to rectify the current so that it were dc. This would cause the coil to get VERY hot and it would not move. This isn't a terrible thing though because not moving opens it up to being able to be cooled by more efficient means such as liquid cooling or even active air cooling etc.

It has been done, is VERY doable and can be pretty efficient. It's just usually space and cost prohibitive I believe.

 

[slim2fattycake 10+ year member]

Ecrack, really diggin that sig. Do one with a BTL and with her in her layla costume. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[ahole-ic]

Ecrack, really diggin that sig. Do one with a BTL and with her in her layla costume. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

There's an easy way to make that happen, but I can't say it here because it's "spam" wink wink.