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Sci.Electronics.Basics -> need HD spindle motor driver
There are 2 messages in this thread.
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Author: JimDate: 16:25 16-08-08
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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
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Author: Sjouke BurryDate: 22:00 16-08-08
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Jim wrote:
> 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
>
>
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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