COMMENT ⊗   VALID 00003 PAGES
C REC  PAGE   DESCRIPTION
C00001 00001
C00002 00002	MOTORS
C00004 00003	ARM PROGRAMS
C00005 ENDMK
C⊗;
MOTORS

Globe motor details.  
Typical demagnetization results

As delivered - back emf equals 9.2
Take out magnets and replace- back emf goes to 8.2
Take out magnets and press like poles together until they touch-
back emf drops to 6.2 or so.
So we see the potential torque loss due to dissassembly.
Careful disassembly gives only a 157 torque loss, but fooling 
around results in up to 50% torque loss.

A good test for fully charged globe motor magnets is to see if it cogs.  If it
does, then the magnets are at least 75% charged.  If it doesnt, then you
have weak magnets.

Placing the poles of a globe motor between the poles of a large alnico magnet
seems to properly recharge the magnets.  As an example- recharging the motor above 
in this manner yeilded a back emf of 9.6.  Higher than the original number- but no
doubt, when put to use, the magnets can be expected to discharge a bit in the
presence of demagentizing armature current induced fields.

As a furthur note- testing the motor with the large charging magnet between the
poles gives an emf of over 15.  
ARM PROGRAMS
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