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RChadwick
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Joined: 08 Nov 2006
Posts: 3
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 Posted: Wed Nov 08, 2006 5:26 am Post subject: Hard Drive motor questions |
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I've got 2 questions I haven't been able to find the answers anywhere..
1) How does a Hard Drive spindle motor work? I'm guessing there's 3 or more poles, and the controller powers them in sequence, but is there a ground, and then the coils, or are they arranged some other way? Does anyone have a schematic of a HD motor?
2) Somewhat related to the first... How does the HD know the speed of the platter motor? How does it know when the platter is at the right speed? How does it know when to drive the coils in the motor? |
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hdd
Deadharddrive regular +1
Joined: 26 Jul 2006
Posts: 45
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| Posted: Wed Nov 08, 2006 11:37 pm Post subject: Re: Hard Drive motor questions |
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| RChadwick wrote: | I've got 2 questions I haven't been able to find the answers anywhere..
1) How does a Hard Drive spindle motor work? I'm guessing there's 3 or more poles, and the controller powers them in sequence, but is there a ground, and then the coils, or are they arranged some other way? Does anyone have a schematic of a HD motor?
Three phase plus a GND
2) Somewhat related to the first... How does the HD know the speed of the platter motor? How does it know when the platter is at the right speed? How does it know when to drive the coils in the motor? |
Servo feedback loop from the motor
When the motor is at speed +- a % then the heads unload and fine tuning is maybe done from the heads.... "Servo Lock" |
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RChadwick
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Joined: 08 Nov 2006
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| Posted: Thu Nov 09, 2006 5:34 am Post subject: |
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| Thanks for the reply. Basically, I'm trying to use a Hard Drive motor in another application. Do you have a simple circuit, or any advice on how to power the motor without the rest of the HD? I'd like to be able to change the spped. |
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