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