Permanent-Magnet Synchronous Motor and Motor-Drive Design

This is an introductory course in PMS motor theory and the design of both PMS motors and motor-drives (controllers and power drivers) from an electronics design viewpoint.  Originally prepared for and presented to NASA, it consists of 21 50-minute instructional units over three days, 7 units per day. Presentation is largely by lecture slides, with some class exercises, and some detailed sections explaining motor theory.

Motor Theory

  1. Introduction, motor (electric machines) book recommendation, quantities of electricity and magnetism, Maxwell's equations, magnetic reference frames, magnetic-electric analogs, inductance derivations.
  2. Electromagnetic force production, PMS motor construction, poles, phase control, and phases.
  3. Torque-current relationship, speed-induced voltage relationship, induced-voltage waveform from motor geometry.
  4. PMS motor model, torque-speed characteristics, maximum mechanical motor power, electrical-mechanical conversion.
  5. Magnetic energy, energy derivation of lme, electromagnetic energy conversion, winding inductance from lme, winding configurations, motor-drive waveform generation.
  6. Three-phase waveforms, rotor position sensing, commutation logic, three-phase, half-wave commutation, sinewave and squarewave drive waveforms, three-phase full-wave six-step commutation, phase advance.
    7.

    Motor Design
  7. Motor design book recommendation, motor design overview, motor T(w) modification with given magnetics, motor figures of merit.
  8. Magnetics design optimization, design sizing, motor magnetics, magnetic materials, permanent magnets.
  9. Magnet sizing, nonlinear magnets, magnet thickness, maximum Bg design, winding leakage inductance, distributed vs concentrated windings.
  10. Wire size, turn lengths, wire packing factor.
  11. Motor efficiency, efficiency with magnetic loss, efficiency with drive loss, efficiency with fan load, motor design system constraints, motor design choice of lme.
    12.

    Motor-Drive Design: Power Circuits
  12. Power, peak, average, rms power, current waveforms, two- and four-quadrant H-bridge drivers, power switching for bipolar current sensing, centered PWM.
  13. Motor-drive power switch dissipation, diode reverse recovery, active-switch devices, MOSFET gate drive current.
  14. High-side driver circuits, transformer-coupled gate drivers, high-side gate-drive supply, power-circuits board layout, thermal design.
    15.

    Motor-Drive Design: Control
  15. Vector control, torque ripple, voltage and current control, speed control, motor-current waveform stability, current control schemes
  16. Models of Y & D configurations with CCM & DCM Commutation, drive schemes comparison, winding series-impedance compensation.
  17. Phase sensing, motor open-terminal voltages, phase from induced-voltage zero-crossings, vector-summed phase control, induced-voltage sensing, starting techniques, current-slope flux sensing.
    18.

    Motion Control
  18. System & control theory review, electrical-mechanical impedance matching, current-driven position system, voltage-driven position system, motor dynamic mechanical response.
  19. Electromechanical resonance, magnetic and electric suspensions books, passive resonant magnetic levitation.
  20. Controlled-field actuator, sensorless solenoid (linear-motor) control. (Presented by Gary Bergstrom.)
  21. Kalman filtering techniques applied to motor-drive and motion system design. (Presented by Dan Simon.)

Available on CD

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