This crystal based
brushless DC motor controller was specifically designed to work with SKC (Shinano Kenshi
Co.) streaming tape drive motor part # DR-4312-001. The principle could be applied to just
about any 3 Phase motor using Hall effect sensors. The heart of the controller is a 2 chip
combination from Unitrode Corporation the UC3633 and the UC3620.
The Speed can be
controlled by selecting different crystal values. The jumpers shown as traces that can be
cut also provide scalar multipliers from X1 to X8. The 4MHz crystal used here with the X1
configuration drives the SKC motor at about 1800 RPM. The P1 connector shown interfaces
directly to the SKC motor pinouts.
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