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

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Modeling and control modes of PM synchronous motor drives Table. 2.2. Summary of voltage, power, power factor requirements under control modes. Requirement Control method Voltage Current Power factor CTA middle low low MTP A low low middle UPF low high 1 CSF high lowes up to 1.1 pu torque Close to 1 up to 1 pu torque From this comparison study it can be concluded that CSF control appears to be superior in terms of steady state performance characteristics compared to other methods under discussion. 32
Modeling and control modes of PM synchronous motor drives 2.3 Summary ‣ There are different forms to express the PMSM equations, but the rotor reference frame equations are the most widely used. The simplification in rotor dq , reference frame equations results from the disappearance of position dependent inductances. ‣ The electromagnetic torque of the IPMSM is not only produced by the permanent magnet flux, but also by the reluctance difference in rotor d- and q- axes. ‣ Electromagnetic torque as cross vector product of the stator flux linkage and current space vectors or rotor and stator flux linkages is independent of coordinate system selected. Therefore, can be expressed in stationary ( α, β ) or rotated ( dq) , coordinates. ‣ For further control strategies consideration it is convenient to express the electromagnetic torque of PMSM machine by: • vector product of stator current and rotor flux vectors. The rotor flux vector in PMSM machine is constant, because of the PM. Therefore, to increase and decrease the torque, the current amplitude and the torque angle δ I should be changed (see Fig. 2.20a), • vector product of stator flux vector and rotor flux vector. Generally, the value of the stator flux amplitude is kept constant at value of rotor flux produced by permanent magnets. So, in this case to change the torque we should adjust the torque angle δ Ψ (see Fig. 2.20b). q β a ) q β b) I s Ψ PM d Ψ s Ψ PM d δ I γ m α δ Ψ γ m α Fig. 2.20 Torque production: a) current control, b) flux control ‣ Taking into account discussion regarding static characteristic under different control strategies it can be said that –depart from special requirements- the most suited for general application PMSM drives is constant stator flux (CSF) operation. 33
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 35: 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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