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MSP430 Motor Controller Applications

MSP430 Motor Controller Applications. LT Thomas TJ Volinski Pat O’Hara Kole Reece. Outline. H-Bridge Types of Motors Polarity Stepper Motor Brushed Motor Brushless Motor Permanent Magnet Motor AC Induction Motor. Speed Controller. Definition Closed Loop Vs Open Loop

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MSP430 Motor Controller Applications

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  1. MSP430 Motor Controller Applications LT Thomas TJ Volinski Pat O’Hara Kole Reece

  2. Outline • H-Bridge • Types of Motors Polarity • Stepper Motor • Brushed Motor • Brushless Motor • Permanent MagnetMotor • AC Induction Motor Design Team 6

  3. Speed Controller • Definition Closed Loop Vs Open Loop • How do we Implement motor control • Protection • Switching Mechanism • Bipolar Operation • Unipolar Operation • Pulse Generator Design Team 6

  4. System Diagram Design Team 6

  5. Unipolar Design Team 6

  6. Bipolar Design Team 6

  7. Schematic Implementation Design Team 6

  8. Types Of Polarity • Axial & Radial Flux Design Team 6

  9. Stepper Motors • Introduced in the 1960’s • Replace Servos • Advantages • Long Life • Excellent Low Speed • High Speed Protection • Disadvantages • High Power • Big Size for Lower Power N Robotgear.com Design Team 6

  10. Torque Control Design Team 6

  11. Design Team 6

  12. Motor Controller • DRV88xx • Steps • 8 to 45 Volts, 2.5 A Full 1/2 1/4 1/8 1/16 1/32 Design Team 6

  13. MSP430 Applications Design Team 6

  14. Brushed DC Motor • Stator has permanent magnets • Rotor has coil, creates EMF • Half rotation is sensed with,commutator. • Actually AC motor. Design Team 6

  15. Brushed DC Motor • 2 Brushes stillshort out • Still have 4 loopsof conducting Design Team 6

  16. Brushless DC Motor • Coils on the Stator • Permanent Magnet on Rotor • Motor topology isnondetermistic Design Team 6

  17. Brushless DC Motor • Add more phases to stator • Run current through different phases. Design Team 6

  18. Brushless DC Motor • Hall effect sensors detect transitionsfrom North to Southpoles. • 3 sensors provide binarydata. Never get 000or 111 therefore use aserror codes. Design Team 6

  19. Permanent Magnet Motor • AC Motor • Sinusoidal Windings on Stator • 3-Phase: each winding coexists together Design Team 6

  20. Permanent Magnet Motor • Field Oriented Control • Calculate the rotor flux • Calculate current of A,B,C windings to make current vector 90 degrees of rotor flux. • Magnitude of current vector can be adjusted for different speeds • Used in applications where a small motor is needed • Uses less power than other motors Design Team 6

  21. AC Induction Motor • Rotor and Stator both have windings • Asynchronous Motor • Magnetic field must rotate faster than rotor • Motor can slow down or slip • Field Oriented Control or V/Hz • 16-bit microcontroller used for V/Hz • 32-bit microcontroller used for FOC • Most popular motor in consumer and industrial applications Design Team 6

  22. MSP430 Brush and Brushless • MSP430 connected to a DRV8801 motorcontroller. Design Team 6

  23. Summary • Low Speed with High accuracy • Stepper motor • Long life • AC Induction, Stepper motor, & Brushless • High Torque • AC Induction • No Feedback • Stepper & Brushed • Less Power • Permanent magnet Design Team 6

  24. Questions Design Team 6

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