Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...

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Modeling and control modes of PM synchronous motor drives M l U sd + − pbΩmΨsd ∫ Ψ sd Ψ PM − 1 L d I sd Ψ sq I sd p b R s − 3 p 2 b M e − 1 J ∫ Ω m R s U sq − − ∫ Ψ sq 1 L q I sq Ψ sd I sq pbΩmΨsq p b Figure 2.9. Block scheme of PM synchronous machine in rotating dq , frame. Based on equations (2.64-2.67) we can also draw the vector diagram of PM synchronous motor (Fig. 2.10). From this vector representation it can see the positions of the vectors (currents, voltages and fluxes). Especially, power angle φ (angle between voltage and current vectors) and torque angle defined in two manners: as an angle between current and rotor flux vectors -δ I , or as angle between stator flux and rotor flux vectors -δ Ψ . q−axis β U s RI s s I s Ψ sq I sq LI d sd ΩΨ s s φ Ψ s LqI sq I sd δ I δ Ψ θ r Ψ sd θ Ψs Ψ PM d −axis rotor α ( A) stator Figure 2.10. Vector diagram of PM synchronous motor in rotor reference frame dq. , 24
Modeling and control modes of PM synchronous motor drives 2.2 Static characteristic under different control modes In this section, basic steady state properties of the PMSM under different control mode strategies will be study [6,9]. The key control strategies for the PMSM can be listed as follows: • Constant torque angle control (CTAC). • Maximum torque per ampere control (MTPAC) • Unity power factor control (UPFC) • Constant stator flux control (CSFC) Constant torque angle (CTA) control This control strategy for PMSM keeps the torque angle δ I (angle between stator current vector and rotor permanent magnet flux) at constant value 90 . q− axis Isq = I s δ = 90 I d − axis Figure 2.11. Current vector and permanent magnet flux vector for constant torque angle operation (CTAC) Hence, this control can be achieved by controlling the d-axis current components to zero leaving the current vector on the rotor q-axis (see Fig. 2.11). Therefore, this strategy is also referred to as I sd = 0 control. The amplitude of rotor flux vector is constant and also the torque angle is constant. So, the torque depends only on the value of stator current amplitude. Therefore, this control strategy is not recommended for IPMSM with high saliency ratio. However, for SPMSM, this strategy is commonly used. Ψ PM The torque equation in this mode of operation becomes: 3 3 M e = pbΨ PMIsq = pbΨ PM Is (2.68) 2 2 25
Page 1 and 2: POLITECHNIKA WARSZAWSKA WARSAW UNIV
Page 3 and 4: Contents Table of Contents Chapter
Page 5 and 6: Introduction Chapter 1 INTRODUCTION
Page 7 and 8: Introduction to surface-mounted mac
Page 9 and 10: Introduction vector control, which
Page 11 and 12: Introduction presented and studied.
Page 13 and 14: Modeling and control modes of PM sy
Page 27: Modeling and control modes of PM sy
Page 39 and 40: Voltage source PWM inverter for PMS
Page 57 and 58: Control methods of PM Synchronous m
Page 69 and 70: Direct Torque Control with Space Ve
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Direct Torque Control with Space Ve
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Sensorless Speed Direct Torque Cont
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DSP implementation of DTC-SVM contr
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Summary and closing conclusion Chap
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Appendices APPENDICES A1 Rotor and
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Appendices ⎡ ⎤ ⎢ 1 0 ⎥ ⎡K
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Appendices i(t1->t0)+=it1 it1: it1=
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Appendices A7 PWM technique - six s
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List of symbol List of symbols Symb
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References Books and PhD-Thesis 1.
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References 39. J.-I. Itoh, N. Nomur
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References 74. N. Ertugrul, P. Acar
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References 108. D. Świerczyński,
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Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...

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