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<blockquote data-quote="Warbleed" data-source="post: 803129" data-attributes="member: 549898">To further clarify what I said earlier, with an overhung motor, making the top plate taller increases BL and reduces Xmax. With an underhung motor, making the top plate taller increases xmax and BL linearity, but will likely not effect BL, since the same amount of the coil is still going to be in the gap.As far as coil adjustments go, making the coil longer on an overhung driver increases xmax, reduces BL, and increases BL linearity. In an underhung driver, increasing coil length increase xmax and reduces BL linearity, and increases BL.So the greater the VC to gap ratio in an overhung, the better the BL linearity, and the lower the VC to gap ratio in an underhung, the better the BL linearity.Underhung motors have very flat BL curves by nature, essentially not losing any BL at all until turns of wire start leaving the gap. However, the two goals of xmax and BL linearity are at odds with one another in an underhung design. To have great BL linearity and high xmax, you need a very large gap.That&#039;s one advantage of XBL^2, is that you can great BL linearity and xmax without having a gargantuan top plate. An underhung can get the same xmax or linearity as an XBL^2 motor with the same gap, but it can&#039;t have both of them at the same time.</blockquote>

[QUOTE="Warbleed, post: 803129, member: 549898"] To further clarify what I said earlier, with an overhung motor, making the top plate taller increases BL and reduces Xmax. With an underhung motor, making the top plate taller increases xmax and BL linearity, but will likely not effect BL, since the same amount of the coil is still going to be in the gap. As far as coil adjustments go, making the coil longer on an overhung driver increases xmax, reduces BL, and increases BL linearity. In an underhung driver, increasing coil length increase xmax and reduces BL linearity, and increases BL. So the greater the VC to gap ratio in an overhung, the better the BL linearity, and the lower the VC to gap ratio in an underhung, the better the BL linearity. Underhung motors have very flat BL curves by nature, essentially not losing any BL at all until turns of wire start leaving the gap. However, the two goals of xmax and BL linearity are at odds with one another in an underhung design. To have great BL linearity and high xmax, you need a very large gap. That's one advantage of XBL^2, is that you can great BL linearity and xmax without having a gargantuan top plate. An underhung can get the same xmax or linearity as an XBL^2 motor with the same gap, but it can't have both of them at the same time. [/QUOTE]

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