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Literature Number: BPRA073
Texas Instruments Europe
February 1998


Contents
1. Introduction.............................................................................................................. 1
2. Classic AC drives..................................................................................................... 1
3. Field Orientated Control........................................................................................... 2
  3.1 Space Vector definition and projection ......................................................... 3
    3.1.1 The (a,b,c)->(a,b) projection (Clarke transformation) .................. 3
    3.1.2 The (a,b)->(d,q) projection (Park transformation)........................ 4
    3.1.3 The (d,q)->(a,b) projection (inverse Park transformation) ........... 5
    3.2 The basic scheme for the FOC..................................................................... 5
  3.3 The input for the FOC ................................................................................... 7
    3.3.1 Current sampling ......................................................................... 7
    3.3.2 Rotor flux position........................................................................ 7
  3.4 Conclusion.................................................................................................... 8
4. The PI regulator....................................................................................................... 8
5. The Space Vector PWM.......................................................................................... 9
  5.1 The 3-phase Inverter .................................................................................... 9
  5.2 The Space Vector Pulse Width Modulation (SVPWM)................................ 10
  5.3 Comparison SV-sinusoidal PWM................................................................ 12
6. Conclusion............................................................................................................. 13
References ................................................................................................................ 14

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