Concept Kit 3-Phase AC Motor Drive Simulation (PSpice Version)
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Concept Kit 3-Phase AC Motor Drive Simulation (PSpice Version)

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Concept Kit 3-Phase AC Motor Drive Simulation (PSpice Version)

Concept Kit 3-Phase AC Motor Drive Simulation (PSpice Version)

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Concept Kit 3-Phase AC Motor Drive Simulation (PSpice Version) Presentation Transcript

  • 1. Concept KitModeling of 3-Phase AC MotorDrive SimulationFor Electric Drive Systems[PSpice Version] All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 1
  • 2. Contents Slide # 1. Modeling of 3-Phase AC Motor Model 1.1 Manufacturer Specification......................................................................................................... 3 1.2 Torque and Back-EMF............................................................................................................... 4 1.3 Simplified 3-Phase AC Motor Model......................................................................................... 5 1.4 The 3-Phase AC Motor Equivalent Circuit................................................................................. 6 1.5 Parameter Settings..................................................................................................................... 7 2. Simulation Circuit of 3-Phase AC Motor Model................................................................................ 8 2.1 Phase Current Characteristics Under Load Variation................................................................ 9 2.2 Back-EMF Characteristics Under Load Condition..................................................................... 10 2.3 Speed and Torque Characteristics At 140Arms........................................................................ 11 2.4 Power Output and Efficiency Characteristics At 140Arms......................................................... 12 Appendix A: Measured Point of Simulation Circuit (1/2)........................................................... 13 Appendix A: Measured Point of Simulation Circuit (2/2)........................................................... 14 Appendix B: Evaluation Text...................................................................................................... 15 Appendix C: Gate Signal for Six-Step Control........................................................................... 16 Appendix D: 3-Phase AC Motor Model Text (1/2)..................................................................... 17 Appendix D: 3-Phase AC Motor Model Text (2/2)..................................................................... 18 Appendix E: Simulation Settings................................................................................................ 19 All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 2
  • 3. 1.1) Manufacturer Specification Motenergy, Inc (ME0913) Motor Electrical Parameters • Operating Voltage Range..........................0 – 72 VMAX • Rated Continuous Current........................140 Arms • Peak Stalled Current.................................400 Arms • Voltage Constant.......................................50 RPM/V • Phase Resistance (L-L).............................0.0125 Ω • Phase Inductance......................................105uH at 120Hz, 110uH at 1kHz • Maximum Continuous Power Rating……..17KW at 102VDC Battery Voltage 14.3KW at 84VDC Battery Voltage 12KW at 72VDC Battery Voltage Motor Mechanical Parameters • Rated Speed.............................................3000 RPM • Maximum Speed.......................................5000 RPM • Rated Torque............................................288 Lb-in • Torque Constant.......................................1.6 Lb-in/A All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 3
  • 4. 1.2) Torque and Back-EMF• The Torque are defined by : Tu  KT  Iu  phe : u, v, w Vphe : Phase voltage applied from inverter to motor Tv  KT  Iv (1) VAC : Operating voltage range (Maximum voltage) Tw  KT  Iw VBAT : DC Voltage applied from battery Te  Tu  Tv  Tw (2) Iphe : Phase current At 140Arms (Rated Continuous Current) Tphe : Electric torque produced by u, v, w phase KT = 1.6 Lb-in/A Te : Electric torque produced by motor Ephe : Phase Back-EMF Tphe = 1.6  140 = 224Lb-in KE : Back-EMF constant Te = 224*3= 672Lb-in KT : Torque constant ωm : Angular speed of rotor• The Back-EMF are defined by : Eu  KE  m  1 Pound Inch equals 0.11 Nm Ev  KE  m (3) Ew  KE  m At 5000 RPM (Maximum Speed) Ephe ≈ VBAT (In an ideal motor, R and L are zero) Ephe = 102V KE = Ephe /ωm = 102 / 5000 KE ≈ 0.02V/RPM All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 4
  • 5. 1.3) Simplified 3-Phase AC Motor Model Frequency Response 110uH 105uH BEMF1 R1 L1 U 1 2 R2 L2 BEMF2 Phase Resistance (L-L) : 0.0125Ω V 1 2 Phase Inductance : 105uH N0 : 110uH BEMF3 R3 L3 W 1 2 Fig. 1 Scheme of the 3-Phase Model Fig.2 Phase-to-Ground All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 5
  • 6. 1.4) The 3-Phase AC Motor Equivalent Circuit E1 eu + emf_u PARAMETERS: PARAMETERS: + |Z| - Frequency - - Back-EMF Voltage RLL = 0.0125 LOAD = 140 LL = 105U lim_u KT = 1.6 Vu 0 U1 KE = 0.02 n1 emf_uU OUT+ IN+ IN+ OUT+ 1 TQSP 2 sp_u OUT- IN- IN- OUT- tu 0 0 lim_v 0 E2 IN+ OUT+ ev + + emf_v IN- OUT- - - 0 lim_w 0 Vv 0 U2 IN+ OUT+ n2 emf_vV OUT+ IN+ IN- OUT- 1 TQSP 2 sp_v OUT- IN- 0 Mechanical part tv 0 0 torque E3 ew + + emf_w - - IN+ OUT+ IN- OUT- Vw 0 U3 n3 emf_w 0 0 speedW OUT+ IN+ TQSP 2 1 sp_w OUT- IN- tw 0 sp_u mul sp_v IN+ OUT+ sp_w IN- OUT- 0 0N0 Fig. 3 Three-Phase AC Motor Equivalent Circuit • This figure shows the equivalent circuit of AC motor model that includes the |Z|- frequency part ,Back-EMF voltage part ,and Mechanical part. • The Back-EMF voltage is the voltage generated across the motors terminals as the windings move through the motors magnetic field. All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 6
  • 7. 1.5) Parameters Settings Model Parameters: LOAD : Load current each phase of motor [Arms] U1 – e.g. LL = 125Arms, 140Arms, or 400Arms ME0913 1 LL : Phase inductance [H] LL = 105U – e.g. LL = 10mH, 100mH, or 1H 2 3 M 4 RLL = 0.0125 N0 KE = 0.02 KT = 1.6 RLL : Phase resistance (Phase-to-phase) [Ω] LOAD = 140 – e.g. RLL = 10mΩ, 100mΩ, or 1Ω KE : Back-EMF constant [V/RPM] – e.g. KE= 0.01, 0.05, or 0.1Fig. 4 Symbol of 3-Phase Induction Motor KT : Torque constant [Lb-in/A] – e.g. KT= 0.1, 0.5, or 1  1 Pound Inch equals 0.11 Nm• From the 3-Phase Induction Motor specification, the model is characterized by setting parameters LL, RLL, KE, KT and LOAD. All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 7
  • 8. 2) Simulation Circuit of 3-Phase AC Motor Model V1 S1 D1 S3 D3 S5 D5 102V UP + + DMOD_01 VP + + DMOD_01 WP + + DMOD_01 - - - - - - 0 0 0 U1 ME0913 RU U 1 4N0 RV RW V W 2 3 M N0 N0 RU, RV, RW: 173.75m V2 102V LL = 105U S2 D2 S4 D4 S6 D6 RLL = 0.0125 UD + + DMOD_01 VD + + DMOD_01 WD + + DMOD_01 KE = 0.02 KT = 1.6 - - - - - - LOAD = 140 0 0 0 0 • Fig.5 Analysis of motor operation powered by UP UD VP VD WP WD alternating voltage variation involves using the model of three-phase induction motor. U2 UP VP WP UD VD WD GDRV All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 8
  • 9. 2.1) Phase Current Characteristics Under Load Variation- Simulation Results 500A Load 50Arms 0A -500A 0s 500ms 500A I(RU)/SQRT(2) Time Load 140Arms 0A -500A 0s 500ms 500A I(RU)/SQRT(2) Time Load 200Arms 0A -500A 0s 500ms I(RU)/SQRT(2) Time  Reference of Phase U Fig. 6 Current Characteristics under load Condition All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 9
  • 10. 2.2) Back-EMF Characteristics Under Load Condition- Simulation Results 200V Load 50Arms 100V 0V -100V -200V 0s 500ms 200V V(X_U1.EU) Time Load 140Arms 100V 0V -100V -200V 0s 500ms 200V V(X_U1.EU) Time Load 200Arms 100V 0V -100V -200V 0s 500ms V(X_U1.EU) Time  Reference of Phase U Fig. 7 Back-EMF Characteristics under load Condition All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 10
  • 11. 2.3) Speed and Torque Characteristics At 140Arms - Simulation Results 4.0KV The Load 140(Arms) is Rated Continuous Current 3.0KV (464.146m,3.2311K)RPM 2.0KV 1.0KV SEL>> 0V V(X_U1.speed) 1.0KV Tphe: Electric torque produced by each phaseLb-in 0.5KV (446.486m,223.728) 0V 0s 500ms V(X_U1.tu) Time  Reference of Phase U Fig. 8 Speed and Torque Characteristics at Load=140Arms All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 11
  • 12. 2.4) Power Output and Efficiency Characteristics At 140Arms - Simulation Results 20KW At Load=140Arms, Power Output ≈ 13.7 [KW] (960.616m,13.662K)Watt 10KW SEL>> 0W RMS(V(RU:1,N0))*RMS(I(RU)) 100 At Load=140Arms, Efficiency ≈ 82 [%] (962.500m,81.941) [%] 50 0 0.5s 1.0s 100*( (RMS(V(U,N0))*RMS(I(RU))) / (RMS(V(RU:1,N0))*RMS(I(RU))) ) Time  Reference of Phase U Fig. 9 Power Output and Efficiency Characteristics at Load=140Arms All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 12