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MōTIV TutorialMōTIV TutorialComplete development of a transducer motor in under 30 minutes
Dan Wiggins and Mark Beach, DYNE AnalyticsCopyright © 2013 Dan Wiggins. All Rights Reserved. For ALMA and instructional use only!
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• Typical starting point• MAYBE box use? 15L/47 Hz• Sketchy, at best!• Use the TS Parameter Wizard
Nominal Size 6.5 InchesCone Material AluminumCone Shape Curvilinear/constant radiusCone Finish & Color Black anodized matteDustcap Concave, end of former mountDustcap Material Black anodized aluminumSurround Material Natural Butyl RubberSurround Shape S Roll Basket Material Aluminum, 35mm ID, 4mm thickVoice Coil Diameter 25.4mm (1 inch)Voice Coil Wire CopperSpider Material CONEX40Magnetic Shielding NoTerminal Sizes Positive: 0.25” Negative: 0.187”
Re 6.5 OhmsLe at 1 kHz 0.26 mHFs 45Qts .36Qms 3.6Vas 22 litersSd 126 cm²SPL/w/m 89 dB @ 1W, 1mXmax (BL) 4mm one way minimumXmax (Mechanical) 10mm one way minimumPower Handling 50W RMS
What do we want?What do we want?
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Set up the voice coilSet up the voice coil• VCID as needed• Copper wire as needed• Low Le = few layers• Set Winding length assuming 6mm top
plate• Set former – power dissipation• Proper DCR, Le looks promising!
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Set up the motorSet up the motor• Typical clearances for voice coil• Use existing magnets• Is Xmech OK?• Typical materials• Turn off Le for now – speed!• Turn off Load Lines – speed!• Simulate the results – OK?
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Application DefinitionApplication Definition• Ignore environment for now• Define driver• No need for filters now• We know the Mms of the
VC; add extra mass to get us where we need to be
Copyright © 2013 Dan Wiggins. All Rights Reserved. For ALMA and instructional use only!
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Run and ResultsRun and Results• VC offset issue?• Low BL – bigger
magnet?• Pole saturated a lot –
make the ID smaller?• Consider inductance
rings• Xmax low – longer VC!
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VC and BL tweaksVC and BL tweaks• Duplicate to concept 2• Pole ID – smaller for
more flux flow • Magnet – DMEGC 3614
of Y30BH• Adjust steel for different
size of magnet• Pole extension – get VC
offset to zero• VC longer – add 2mm,
adjust wire diameter to keep DCR
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Run and ResultsRun and Results• Compare against concept
1• Good Xmax• Good T/S parameters• THD is down – good!• Still some saturation –
good!• Box alignment looks
flatter• We’ve nailed out the
basics
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Inductance Inductance optimizationoptimization
• Make it flat!• Consider effect of aluminum
basket• Lower ring – closer to VC is good!
o Start with aluminumo 1mm thick ringo Close to VC
• Activate Load Lines – check!• Activate Le calculations
o Use relevant frequencies
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Run and ResultsRun and Results• Le looks good – can
we go thinner?• Fairly symmetric• Is the 250 Hz line
OK?• Check load line –
bump up power to peak 100W
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Save and documentSave and document• Add appropriate notes to file
for your own records• Dump out into a nice HTML
file – anyone can read• Maybe see if you can refine
other topologies?o Underhungo XBL™
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Compare different Compare different topologiestopologies
• Took about 5 minutes per motor
• Quick comparison of different models
• Overhung – big power handling, simple, normal
• Underhung – lower THD, thicker top plate, same magnet mass, Le issues
• XBL – lower THD, top plate between OH/UH, more stroke, same magnet mass, better Le
Copyright © 2013 Dan Wiggins. All Rights Reserved. For ALMA and instructional use only!
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Questions and wrapupQuestions and wrapup
THANK YOU!THANK YOU!
Copyright © 2013 Dan Wiggins. All Rights Reserved. For ALMA and instructional use only!