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On 7/21/2013 6:20 PM, Henner Zeller wrote:
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<div dir="ltr">are the motors identical ? If so, then the motor
probaly generates a voltage in a similar order of magnitude
(minus the losses).</div>
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yes. what are the losses?<br>
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<div bgcolor="#FFFFFF" text="#000000">>>If you voltage
is _way_ to high (which I suspect is happening here), then
you can blow the input stage</div>
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if the input stage op amp blows from over-voltage on the input,
would the power amp chip still be protected?<br>
<br>
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<div class="gmail_quote">If the motor doesn't work anymore,
something blew inside. </div>
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that much i figured out. <br>
<br>
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<div class="gmail_quote">Maybe one winding is gone ? Or there
are overvoltage protection diodes that fried. Or some
mechanical failure in the commutator. 60000 RPM is pretty
high.
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6,000, not 60,000<br>
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<div style=""> If it looks like a sine with one side folded
over to the top (so more like camel humps), then it is the
commutated output (so: a DC motor).</div>
<div style="">If you can operate the motor with DC, it is a
DC motor.</div>
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def a DC motor, but not seeing a rectified sine on the scope. Seeing
two super-imposed sines on the scope, which seems impossible. But if
the motor is outputting ten's of volts, then maybe i'm overdriving
the scope, and it's readings are inaccurate. <br>
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Thx!<br>
<br>
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<div class="moz-signature"><font size="+1"> Johny Radio<br>
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Stick It In Your Ear!<br>
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