CDROM spindle motors really are stepper motors too

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.

You could say then that a motor is only a 'stepper motor' if it is used in that configuration.

Like a Delivery Van is on ly a Delivery Van if the van is used in Delivery Van configuration.

geoff

From

Stepper motors operate much differently from normal DC motors, which rotate when voltage is applied to their terminals. Stepper motors, on the other hand, effectively have multiple "toothed" electromagnets arranged around a central gear-shaped piece of iron. The electromagnets are energized by an external control circuit, such as a microcontroller. To make the motor shaft turn, first one electromagnet is given power, which makes the gear's teeth magnetically attracted to the electromagnet's teeth. When the gear's teeth are thus aligned to the first electromagnet, they are slightly offset from the next electromagnet. So when the next electromagnet is turned on and the first is turned off, the gear rotates slightly to align with the next one, and from there the process is repeated. Each of those slight rotations is called a "step." In that way, the motor can be turned a precise angle.

From

An Internet troll, or simply troll in Internet slang, is someone who posts controversial and usually irrelevant or off-topic messages in an online community, such as an online discussion forum or chat room, with the intention of baiting other users into an emotional response or to generally disrupt normal on-topic discussion.

Steppers operate exactly the same as 'brushless DC motors', which also are different from 'normal DC motors' in that neither will rotate (continously) when voltage is applied to their terminals.

If you actually have a close look at the link you quoted above,

you will find a diagram of a stepper motor with 3 coils connected in delta, for smooth rotation, which is the same configuration as most CDROM

9-pole spindle motors.

In message , fritz writes

Best thing to do is just KF him and forget he exists. Oh, don't quote him either, it defeats the object of the killfile some of us have placed him in.

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Clint Sharp

The general class is 'brushless DC motors'. As I have been pointing out, if they are used for positioning they are called stepper motors. If they spin, then they are usually just labelled 'brushless DC motors', but this is misleading because if you just apply DC to them, they will NOT spin. From an engineering point of view, they differ in detail, not in their fundamental operation. A 'stepper' will rotate continously if it's coils are driven in the correct sequence, and they can be very smooth when compared to 'brush commutated DC motors', by the way.

That is a bad analogy.

"Clint Sharp"

** FUCK OFF HOME

- you festering pile of pommy shit.

... Phil

Philthy, Off the meds - I can tell. Some consolation is you're here causing a stink and not on aus.hi-fi for a change.

In message , Alan Rutlidge change. Please don't quote him, if you don't quote him I don't see his ranting. Although I do like the idea that he's expending all that energy getting angry and foaming at the mouth in vain.

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Clint Sharp

No quoting. Normal Usenet reply. Info too brief to snip. Besides, how was I to know you had PA kill-filed? If I knew that I'd be predicting the Lotto numbers - right? :-)

In message , Alan Rutlidge

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Clint Sharp