Re: Do DC permanent magnet motors get old and weak?
|
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 ?
toggle quoted message
Show quoted text
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
|
