 How to run hard drive motors?
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Marko
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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
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Brushless motors are usually 3-phase triangle circuit, with center pin so each coil can be acessed independently (4 pins total). In nature they could be considered synchronous motors as they have premanent magnet rotor and controller always tries to keep the speed of rotating field similar to the speed of rotor.
For feedback hall effect sensors can be used (additional pins you see) that track the rotation of magnetic field or feedback can be taken inductively directly from coils that are not in use (requires somewhat more sophisticated chip).
IC increases frequency of pulses to match the feedback until motor reaches it's maaximum speed.
Wikipedia says a lot more and I hope I don't need to rewrite it here 
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Part Scavenger
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Registered Member #79
Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
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I tried that speaker thing. It was pretty cool I must say. Sound quality wasn't that bad either, and I had it going in under 5min (no lie!). The coil was even labeled for me -/+  Definitely a must do.
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FastMHz
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Registered Member #179
Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
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So does this mean I could modify a simple LED chaser circuit by replacing LEDs with transistors and driving the motors off that?
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