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THE HAND-CRANKED TORCH - charging current 175mA
(after the modification)
Close-up of the 3.6v Li Ion 450mAhr cell.
I want to play with getting electricity out of a dc motor. Power a few LEDs, be handy if I could take it apart and practice motor maintenance and brush replacement. Tips on what to look for?
The OPs opening statement is that he would like to get electricity out of a motor to light some LEDs. and I am saying that a permanent magnet motor would be easiest for that purpose. Many motors, including power tool motors are moving away from brushes over to solid state commutation, so if the OP wants to get experience with motors in addition to the old brushes and commutator type it would be wise to investigate the new wave.Although for practicing brushed motor maintenance as the OP mentions, a PC fan is virtually useless and is usually a throw away item if it fails.
Max.
but often a car (auto) alternator will be scrapped because the brushes are worn or one of the bearings have gone- both simple repairs.
I can get brushes for any alternator from a number of local car spares shops. I don't know about your part of the USA, but you can certainly get alternator brushes by mail order.If you can find the parts. A lot of whats made today, there are no supply side outlets for the DIYer, they are only available to the "big guys".
On the same line a wish to practice motor maintenance was also expressed and changing brushes etc, which virtually limits it to DC brushed and Universal motors.
Max.
I would like to see you light a few LEDs with a universal motor. The OPs post is about learning about motors not specifically about only learning about brushes.I want to play with getting electricity out of a dc motor. Power a few LEDs, be handy if I could take it apart and practice motor maintenance and brush replacement. Tips on what to look for?