Hi

I have a DC motor 12vdc 300w, which has 4 brush setup, the motor had a problem where all the magnets became unbonded from the housing, I have tried refixing the magnets but the motor has low power and pulls lots of current.

the magnets are set out in 4 quadrants and the 4 brushes are 90 deg apart with opposing brushes being + and -

I'm trying to understand if I have rebonded the magnets in the housing at the correct polarity, basically I have opposing magnets at the same pole like:-

N
S S
N

is this correct? If so I cannot understand why the motor has low power, and in some cases is the motor stops in a certain position it will not restart just pull lots of current.

Thanks for any assistance

Mak

 

........ If so I cannot understand why the motor has low power, and in some cases is the motor stops in a certain position it will not restart just pull lots of current.

This statement tells that you have re-assembled the magnets incorrectly!
Tray to get info from the manufacturer or tray various logic combination till the motor still run normally.

Cheers

Alberto

 

This statement tells that you have re-assembled the magnets incorrectly!

+1 on the same.
Max.

 

Hi

OK the manufacturer is not very helpful so was kinda looking for someone with some 4 brush DC motor knowledge.

Mak

 

You have your magnets in incorrectly but you have the proper setup. The two norths should oppose each other and the two souths should oppose each other, so it should be N-S-N-S. My question is, how did you determine the polarities before you put them in? Are any of them cracked?

 

You may need to rotate the endbell with the brushes 90 degrees.