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Old Oct 27, 2012, 02:42 PM
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Joined Mar 2011
97 Posts
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Why brushes run out in dc 24 Volt permanent magnet blower motor in short time?

brushes and commutator dont have any problem. But brushes are runned out in short time in 24V permanent magnet dc motor.
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Old Oct 27, 2012, 10:51 PM
Registered User
Joined Nov 2007
895 Posts
What do you mean by 'short time'.

I found that a standard automotive windshied washer pump will run a long time at 12 volts but at 24 volts the brushes get hot and break apart in a few seconds. At 18 volts they run OK and make a good fuel pump for a small flame thrower.

Otherwise there is no reason brushes cannot last thousands of hours at any voltage.
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Old Oct 28, 2012, 02:39 PM
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Joined Mar 2011
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short time means between 2-6 months.
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Old Oct 29, 2012, 10:26 PM
Scratch builder
USA, PA, Telford
Joined Apr 2004
1,347 Posts
Wrong spring pressure
excessive amps/sq. inch
comm out of round
wrong brush material

PWM controller pulsing at low frequency
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Last edited by KenSt; Nov 02, 2012 at 08:33 AM. Reason: added PWM...
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Old Nov 05, 2012, 03:32 PM
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Tennessee
Joined Mar 2005
111 Posts
Quote:
Originally Posted by mjsas View Post
make a good fuel pump for a small flame thrower
Please elaborate
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