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<blockquote data-quote="ciaonzo" data-source="post: 6444812" data-attributes="member: 607015"><p>Now let me throw a couple of other motors at you. Not really, because that would hurt. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p><p></p><p>This one is also called a 3HP+ but it is clearly different from the one I just showed you. It has the same four .75" slugs and T-yoke, although, it's not cut down so the height is the same as the traditional 3HP. It has a 35mm top plate and the relationship of the T-yoke and top plate are different from both the LMS 4000 3HP+ and the traditional 3HP. Also, notice that instead of a shorting ring under the top plate, there is a copper sleeve on the pole. The gap is much wider than all the other motors, 8mm for the air gap. Factor in the thickness of the copper sleeve which is at least 2mm and you now have a 10mm wide gap that is 35mm tall. The resulting flux pattern would be extremely different from the LMS 4000 version. I've tested a 4000 top assembly on it in free-air, observing the correct centering of the coil (up and down center) in the flux pattern and the excursion behavior was very different. It's as if there was a plateau for bit where excursion didn't increase as frequency decreased, maybe for a bandwidth of 10 to 15 cycles, beginning at about 38Hz and extending down to around 25Hz. This is not how an LMS driver normally behaves. Here's a comparison next to the LMS 4000 3HP+.</p><p></p><p><img src="http://i704.photobucket.com/albums/ww43/ciaonzo/Motors/DSC04049.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i704.photobucket.com/albums/ww43/ciaonzo/Motors/DSC04059.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Here's a comparison next to the traditional 3HP. Same T-yoke and same 35mm top plate thickness. Wider gap on the 3HP+ and an extra slug.</p><p></p><p><img src="http://i704.photobucket.com/albums/ww43/ciaonzo/Motors/DSC04047.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i704.photobucket.com/albums/ww43/ciaonzo/Motors/DSC04040.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="ciaonzo, post: 6444812, member: 607015"] Now let me throw a couple of other motors at you. Not really, because that would hurt. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] This one is also called a 3HP+ but it is clearly different from the one I just showed you. It has the same four .75" slugs and T-yoke, although, it's not cut down so the height is the same as the traditional 3HP. It has a 35mm top plate and the relationship of the T-yoke and top plate are different from both the LMS 4000 3HP+ and the traditional 3HP. Also, notice that instead of a shorting ring under the top plate, there is a copper sleeve on the pole. The gap is much wider than all the other motors, 8mm for the air gap. Factor in the thickness of the copper sleeve which is at least 2mm and you now have a 10mm wide gap that is 35mm tall. The resulting flux pattern would be extremely different from the LMS 4000 version. I've tested a 4000 top assembly on it in free-air, observing the correct centering of the coil (up and down center) in the flux pattern and the excursion behavior was very different. It's as if there was a plateau for bit where excursion didn't increase as frequency decreased, maybe for a bandwidth of 10 to 15 cycles, beginning at about 38Hz and extending down to around 25Hz. This is not how an LMS driver normally behaves. Here's a comparison next to the LMS 4000 3HP+. [IMG]http://i704.photobucket.com/albums/ww43/ciaonzo/Motors/DSC04049.jpg[/IMG] [IMG]http://i704.photobucket.com/albums/ww43/ciaonzo/Motors/DSC04059.jpg[/IMG] Here's a comparison next to the traditional 3HP. Same T-yoke and same 35mm top plate thickness. Wider gap on the 3HP+ and an extra slug. [IMG]http://i704.photobucket.com/albums/ww43/ciaonzo/Motors/DSC04047.jpg[/IMG] [IMG]http://i704.photobucket.com/albums/ww43/ciaonzo/Motors/DSC04040.jpg[/IMG] [/QUOTE]
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