1. Dynamical Operation, Vector Control, DTC and Encoder-less Operation
Summary
Dynamical Operation, Vector Control, DTC and Encoder-less Operation

2. ©Copyright Ned Mohan 2005, by permission from MNPERE
Seamless discussion of dynamic control and encoder-less operation
©Copyright Ned Mohan 2005, by permission from MNPERE

3. What is an Electric-Motor Drive?
Harnessing of Wind Energy
Hybrid Electric Vehicles
©Copyright Ned Mohan 2005, by permission from MNPERE

4. ©Copyright Ned Mohan 2005, by permission from MNPERE
Power Processing Unit
Reference Book: First Course on Power Electronics by Ned Mohan, published by MNPERE (See for details).
©Copyright Ned Mohan 2005, by permission from MNPERE

5. Equivalent Windings in A Squirrel-Cage Rotor
Figure 2-5 Rotor circuit represented by three-phase windings.
(b)
Stator
Rotor
Mutual

6. Dynamic Analysis of Induction Machines in Terms of dq-Windings

7. Representation of Stator MMF by Equivalent dq Windings

8. Mutual Inductance between dq Windings on the Stator and the Rotor

9. Mathematical Relationship between dq and phase Winding Variables (abc to dq)

10. Mathematical Relationship between phase Winding Variables and dq (dq to abc)

11. Derivation of Voltages in dq Windings

12. Electromagnetic Torque on the Rotor d-Axis

13. Electromagnetic Torque on the Rotor q-Axis
Net Electromagnetic Torque

14. Simlink-based dq-Axis Simulation of Induction Motor

15. Simulation Results

16. Mathematical Description of Vector Control

17. Motor Model with the d-Axis Aligned with the Rotor Flux Linkage Axis

18. Dynamic Circuits with the d-Axis Aligned with the Rotor Flux Linkage Axis
Calculation of
Calculation of Torque

19. D-Axis Rotor Flux Dynamics

20. Motor Model

21. Speed and Position Loops for Vector Control
Figure 5-8 Vector controlled induction motor drive with a current-regulated PPU.

22. Design of Speed Loop

23. Simulation of CR-PWM Vector Controlled Drive using Simulink

24. Simulation Results of a Vector Controlled Induction Motor Drive

25. Space-Vector Pulse-Width-Modulated (SV-PWM) Inverters
Advantages
Full Utilization of the DC Bus Voltage
Same simplicity as the Carrier-Modulated PWM
Applicable in Vector Control, DTC and V/f Control

26. Synthesis of Stator Voltage Space Vector

27. Basic Voltage Vectors

28. Synthesis of Voltage Vector in Sector 1

29. Limit on the Amplitude of the Stator Voltage Space Vector
(sinusoidal PWM)

30. Synthesis using Carrier-Modulated PWM

31. Synthesis of Space Vector using Carrier-Modulated PWM in Simulink

32. Control Waveforms for Carrier Pulse-Width-Modulation

33. Direct Torque Control (DTC) and Encoder-less Operation of Induction Motors

34. DTC System Overview Measured Inputs: Stator Voltages and Currents
Estimated Outputs: 1) Torque, 2) Mechanical Speed, 3) Stator Flux Amplitude and 4) its angle

35. Principle of DTC Operation

36. Calculation of Stator Flux:
Calculation of Rotor Flux:
Estimating Mechanical Speed:
where
Estimating Torque:

37. Inverter Basic Vectors and Sectors

38. Stator Voltage Vector Selection in Sector 1

39. Selection of the Stator Voltage Space Vector
Effect of Voltage Vector on the Stator Flux-Linkage Vector in Sector 1.
increase
decrease

40. Effect of Zero Stator Voltage Space Vector

41. DTC in Simulink

42. Fig. 2 Torque Waveforms.

43. Fig. 3 Speed Waveforms.

44. Fig. 4 Stator Flux.

45. Fig. 5 Stator and Rotor Fluxes.

46. Vector Control of Permanent-Magnet Synchronous-Motor Drives

47. Non-Salient Permanent-Magnet Synchronous Motor

48. Non-Salient Permanent-Magnet Synchronous Motor (Continued)

49. Controller in the dq Reference Frame
Figure 9-3 Controller in the dq reference frame.

50. Vector Control of a Permanent-Magnet Synchronous-Motor Drive

51. Simulation Results