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· In depth idiot
8,696 Posts
QUOTE (Gary @ 23 Oct 2007, 16:37) <{POST_SNAPBACK}>Is there any downside?
From the electrical side, it's all benefit. Higher magnetic flux means more torque from lower current, better protection against burning out motor coils.

Mechanically, if the bearings are in good condition then no problem. If the bearings are worn then the motor may become very noisy as the armature is dragged off centre by the higher field. This effect is worst in three pole motors which do not fill the magnetic gap between the pole pieces very well. If the bearings are worn enough it is sometimes possible to see the armature 'snapping' across the pole pieces, six times a revolution, as the motor is slowly hand turned.

· Premium Member
2,740 Posts
Discussion Starter · #4 ·
QUOTE Do we have any information which enables us to compare these to the 'South Pole' magnets mentioned in Put new magnets in old locomotives which was posted last year?

Pass. From the report it seems the degree of success is down to the type and wear of the motor the magnets are being fitted to.

It should be remembered that magnet strength can drop in an old loco even though the loco may never have been used.

On the subject of bearings and other small motor parts does anybody know a low cost source or do we have to visit the breakers yard?

The usual suspects can be a little pricey but I suppose beggers cannot be choosers.

Happy modelling
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