Reiko Raute

1
Sensorless Control of Induction Machines

• Reiko Raute

Dr. Mark Sumner Dr. Cedric Caruana Prof. Greg
Asher Dr. Cyril Spiteri Staines Dr. Joseph
Cilia
2
Outline of Presentation

• 1. Sensorless control of induction machines
• 2. Machine rig
• 3. FPGA board
• 4. First Results
• 5. Summary

3
1. Sensorless control of induction machines
4
1. Sensorless control of induction machines
5
2. Machine rig setup

• Designed machine rig and drive units

6
2. Machine rig setup
7
3. FPGA board design
8
3. FPGA board design

• Designed FPGA periphery board for DSK 6713C

9
3. FPGA board design

• Designed FPGA periphery board for DSK 6713C

10
3. FPGA board design

• Features of the FPGA program
• Runs synchronized to DSK board at 45 MHz
• PWM timer unit (with test vector generation
  capability)
• ADC trigger unit (selectable sample frequency
  and synchronization to PWM)
• Encoder interface (with filter and timing unit
  for speed measurement)
• Trip handling unit incl. Watch dog
  timer(selectable trip sources)

11
4. First Results

• Used control structure (Id5.8A, Iq6A)

12
4. First Results

• Rotor flux position estimation at rated torque
  (Id5.8A, Iq6A)

13
5. Summary

• Set up of experimental machine rig
• Designed of FPGA periphery board for using the
  DSK 6713C board in motor control applications
• First sensorless algorithm, which shows precise
  rotor flux estimation at low speed incl. zero
  mechanical speed at rated torque (no PWM
  switching patterns modification and only use of
  standard current transducer)