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Article #20382

Variable speed motor control

#20382
From: *Hobbit*
Date: Wed, 11 Jan 1989 19:08
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... not to mention what the inductive backlash can do to your *transistor*!

The appropriate fix is a clamp diode around the motor, I suppose, but that
raises another question: Does the motor behave differently when it's allowed
to backlash, instead of being clamped?

And another question I just thought of: What exactly does placing a clamp
diode around the *transistor* do?  It seems to me that the motor would try
to backlash through the power supply.  I often see these extra diodes as part
of Darlington packages, etc.

_H*
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Message-ID: <Jan.11.14.08.08.1989.12795@topaz.rutgers.edu>
Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!clyde!att!rutgers!topaz.rutgers.edu!hobbit
References: <288@heurikon.UUCP> <3660001@hpirs.HP.COM>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!clyde!att!rutgers!topaz.rutgers.edu!hobbit
From: hobbit@topaz.rutgers.edu (*Hobbit*)
Newsgroups: sci.electronics
Subject: Variable speed motor control
Message-ID: <Jan.11.14.08.08.1989.12795@topaz.rutgers.edu>
Date: 11 Jan 89 19:08:09 GMT
References: <288@heurikon.UUCP> <3660001@hpirs.HP.COM>
Organization: LCS Expert gang, Rutgers
Lines: 12