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need HD spindle motor driver

I have a number of small spindle motors salvaged from old hard drives that have only 3 connections. As far as I can tell using my VOM, the 3 coils do NOT have a common ground connection......or at least I can't find one.

Can someone describe how the 3 coils of this type of (brushless) motor are driven to make the motor run? I am familiar with HD motors having 4 connections, and there are a number of handy DIP IC's to run this type of spindle motor, but is there an equivalent IC for use with these 3 coil HD motors?

Thanks Jim

Reply to
Jim
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It is a 3 phase motor, feed them with some voltage approximating that, and it will turn, even if you use square waves, if each is shifted 1/3 period. The center point to which the 3 windings are connected, can be floating.

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Reply to
Sjouke Burry

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