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Digital Spindle Motor Speed Control Disclosure Number: IPCOM000040565D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02

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Ahmann, RD Purkett, JC [+details]


This invention provides a means to control the speed of a hard file spindle motor within .1%. This is accomplished using a microprocessor in conjunction with selected hardware elements. (Image Omitted) As shown in Fig. 1, the spindle motor control consists of five major hardware elements. These are the microprocessor 7, a 4-bit digital-to-analog converter 8, a transconductance amplifier 9 which transforms a voltage input to a proportional current output, a six pole - three phase delta connected DC motor 10, and commutation logic 11 for the motor which permits the current input to the spindle motor to be directed in such a way to promote correct motion.