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CDROM spindle motors really are stepper motors too

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fritz

Jan 1, 1970
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There is no fundamental difference between what is called
a 'stepper motor' and a 'brushless DC motor'. Either can
'step' or 'run' according to the drive electronics. Both require
electronic drive circuits to rotate to a step or to spin.

A CDROM motor with 9 stator windings and a 12 pole rotor
(6N + 6S), although designed to spin a CD continously,
will behave like a 10 degree stepper motor - energising
the coil terminals with DC in the right sequence will result
in 36 different rotor positions.
Energising the coil terminals with DC quickly in the correct
sequence (ie. AC) will result in smooth rotation, just as
energising the coils in ANY stepper motor with the correct
phase and amplitude will result in smooth rotation.
 
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fritz

Jan 1, 1970
0
geoff said:
OK CDs and DVDs all use stepper motors.

geoff

Spindle motors won't be called stepper motors in your
spare parts index....they will be labelled brushless DC motors..
I am just pointing out that from an engineering point of view,
they differ in detail, not in their fundamental operation.
 
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