Re: Do DC permanent magnet motors get old and weak?
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DC motors wear out. Think of car starters and even back further to car generators. They had to be periodically taken apart and the armature turned down and new brushes installed. Most of the new motors are throw aways, can not be rebuilt or if you can get them apart, no parts available.
?Jeff
On Monday, April 29, 2024 at 07:59:20 PM EDT, John Dammeyer <johnd@...> wrote:
Hi Tim, I¡¯m not sure it applies to older DC motors but I do know that you can¡¯t take a stepper motor apart without damaging the magnetic field.? The structure around the armature serves as a ¡®keeper¡¯ for the magnet.? Remember the old horsehoe magnets also required a small bar across the end when the magnet was stored. So it¡¯s quite possible on a newer lawnmower DC motor that the motor is designed to not be taken apart. John ?
From: [email protected] [mailto:[email protected]] On Behalf Of vt_biketim
Sent: April 29, 2024 4:43 PM
To: [email protected]
Subject: [Unimat] Do DC permanent magnet motors get old and weak? ? Not specifically a Unimat question, but some people here seem to know a heck of a lot about brushed, DC motors. Do these permanent magnets get tired after a while? I scavenged one from a lawnmower labeled 24VDC/500 W/4300 rpm. When I hook it up directly to the 24V battery pack it only gets up to maybe 300 rpm. I replaced the brushes and made sure the bearings spun nicely and the battery is fully charged. Am I missing something, or is it junk?
Tim in Vermont
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