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

2. Outline H-Bridge Types of Motors Polarity Stepper Motor Brushed Motor
Brushless Motor
Permanent Magnet Motor
AC Induction Motor
4/1/2011
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
2/16/2011
Design Team 6

4. System Diagram
2/16/2011
Design Team 6

5. Unipolar
2/16/2011
Design Team 6

6. Bipolar
2/16/2011
Design Team 6

7. Schematic Implementation
2/16/2011
Design Team 6

8. Types Of Polarity
Axial & Radial Flux
4/1/2011
Design Team 6

9. N Stepper Motors Introduced in the 1960’s Advantages Disadvantages
Replace Servos
Advantages
Long Life
Excellent Low Speed
High Speed Protection
Disadvantages
High Power
Big Size for Lower Power N
Robotgear.com
4/1/2011
Design Team 6

10. Torque Control
4/1/2011
Design Team 6

11. 4/1/2011
Design Team 6

12. Motor Controller DRV88xx Steps 8 to 45 Volts, 2.5 A Full 1/4 1/16 1/2
1/8
1/32
4/1/2011
Design Team 6

13. MSP430 Applications
4/1/2011
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.
4/1/2011
Design Team 6

15. Brushed DC Motor 2 Brushes still short out
Still have 4 loops of conducting
4/1/2011
Design Team 6

16. Brushless DC Motor Coils on the Stator Permanent Magnet on Rotor
Motor topology is nondetermistic
4/1/2011
Design Team 6

17. Brushless DC Motor Add more phases to stator
Run current through different phases.
4/1/2011
Design Team 6

18. Brushless DC Motor
Hall effect sensors detect transitions from North to South poles.
3 sensors provide binary data. Never get 000 or 111 therefore use as error codes.
4/1/2011
Design Team 6

19. Permanent Magnet Motor
AC Motor
Sinusoidal Windings on Stator
3-Phase: each winding coexists together
4/1/2011
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
4/1/2011
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
4/1/2011
Design Team 6

22. MSP430 Brush and Brushless
MSP430 connected to a DRV8801 motor controller.
4/1/2011
Design Team 6

23. Summary Low Speed with High accuracy Long life High Torque No Feedback
Stepper motor
Long life
AC Induction, Stepper motor, & Brushless
High Torque
AC Induction
No Feedback
Stepper & Brushed
Less Power
Permanent magnet
4/1/2011
Design Team 6

24. Questions
4/1/2011
Design Team 6