Thread Number: 39410
/ Tag: Recent Vacuum Cleaners from past 20 years
Vacuum motors turned CCW by hand... |
[Down to Last] |
Post# 418224 , Reply# 2   1/6/2020 at 17:58 (1,543 days old) by texaskirbyguy (Plano, TX)   |   | |
Checkrate/Likes
 
1    
It is possible your Royal has tighter-fitting or different sized brushes that give more even wear. I have never torn down a Royal so not sure how they are made. |
Post# 418231 , Reply# 3   1/6/2020 at 20:58 (1,543 days old) by broomvac (N/A)   |   | |
Checkrate/Likes
 
     
texaskirbyguy hit the nail on the head. You are hearing the brushes catch just a bit in the spaces between the commutator bars. Some motors will make a louder sound than others. Some won’t do it at all. It’s just design.
I avoid doing this to my vac motors for the same reason texaskirbyguy brought up; I don’t want to potentially chip the trailing edges of my brushes. Have you harmed your motors? The likelihood is slim to none, but best practice is to not do it. Thanks for the interesting topic! |
Post# 418247 , Reply# 4   1/7/2020 at 03:13 (1,542 days old) by huskyvacs (Gnaw Bone, Indiana)   |   | |
Checkrate/Likes
 
     
It won't hurt the motor to turn it backwards by hand - under power (reversing the motor) yes. But what it will do is like the guys above said - chip the brushes or file off the delicate pattern in the age wear that has bedded them to the shape of the armature. You don't want that, as it will cause excessive arcing and greater brush wear and risk of overheating damage to the armature. A few times wouldn't have hurt it, but definitely don't do it often.
|
Post# 418287 , Reply# 7   1/7/2020 at 21:36 (1,542 days old) by Kirbysthebest (Midwest)   |   | |
Checkrate/Likes
 
     
Well said, good explanation. |
Post# 418297 , Reply# 8   1/8/2020 at 02:47 (1,541 days old) by MadMan (Chicago, IL, USA)   |   | |
Checkrate/Likes
 
     
As for why some motors don't do this... Some commutators don't have a trench between each contact, in those, the space between each contact is filled with epoxy. So there won't be a trench to catch the sharp edge of the brush. I'm fairly certain that's why.
Also, go ahead and turn it backwards. What's gonna happen? Chip off 1000th of an inch of carbon? Big deal. |