Schedule for this course

This course provides an in-depth look into the technology of spindle motors and how they are designed, manufactured, and used. The course concentrates on the topics that are the most important for a rapid and complete understanding of disk drive spindle motors. Each topic begins with engineering fundamentals and proceeds to engineering understanding using common practice equations, plots, displays, and measurement equipment. In this manner, the course treats the following: electromagnetics, electrical driver circuits, running current, start time, torque dynamics, mechanical resonances, run out, vibration and acoustics. Future trends discussed in the course include going to 15000 rpm, small motor sizes and motor topology trends. If you need a better understanding of the technology behind disk drive spindle motors, this course is the choice.
 

Electromechanics External outline of a spindle motor Stator and rotor cross-sections Winding Pattern Magnets, steel, coil and air gap Electromagnetic torque Torque angle curve Torque and back emf factors Starting torque vs. running speed Standard tests Commutation waveforms Motor driver H-bridge Voltage drops Motor spin-up Current spin-up waveforms Running current Run out RRO and NRRO Axial and radial Servo track writer effects on RRO Vibration Review of mechanical resonance Mechanism of common resonance modes Dependence on rpm Waterfall plots and Campbell diagrams Measuring and calculating resonant modes Design Constraints Performance Electromechanical Servo-loop peaking effects

Testing and Manufacturing Issues Motor level vs. drive level Back emf test RRO and NRRO Start time Manufacturing Issues From prototype to high volume Sample sizes What's easy to change and what's not Acoustics Tones and white noise Acoustic sources Measuring acoustics How to separate magnetic and mechanical sources Methods used to reduce acoustics Motor Losses Resistance and magnetic losses Hysteresis loop losses Windage and bearing friction losses Future spindle motors Configurations that won't make it Size and Topology trends Experiments Magnet flux density Coil resistance Torque vs. rotor angle Back emf factor Commutation 3-phase waveforms Power spectrum of run out Resonant modes Spectrum of acoustics

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