I repaired the rusted shell of a small 12V DC PM motor, but forgot to note the position of the brushes relative to the magnets. After putting it together, it seems to run at the same no-load speed with a wide variation in brush angle and I can not apply a load and adjust the brush angle at the same time. This is a low cost Japanese motor (20mm 6-pole rotor, copper-graphite brushes on 6-sector communtator, and two thin ceramic magnets inside the shell). Where should the brushes be for maximum power or how can that be determined? (Note: subtract 69 from listed email for actual email.)
- posted
17 years ago