Concept Kit 3-Phase AC Motor Drive Simulation (PSpice Version)
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Transcript of Concept Kit 3-Phase AC Motor Drive Simulation (PSpice Version)
For Electric Drive Systems[PSpice Version]
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 1
Concept KitModeling of 3-Phase AC Motor Drive Simulation
Contents
Slide #
1. Modeling of 3-Phase AC Motor Model
1.1 Manufacturer Specification.........................................................................................................
1.2 Torque and Back-EMF...............................................................................................................
1.3 Simplified 3-Phase AC Motor Model.........................................................................................
1.4 The 3-Phase AC Motor Equivalent Circuit.................................................................................
1.5 Parameter Settings.....................................................................................................................
2. Simulation Circuit of 3-Phase AC Motor Model................................................................................
2.1 Phase Current Characteristics Under Load Variation................................................................
2.2 Back-EMF Characteristics Under Load Condition.....................................................................
2.3 Speed and Torque Characteristics At 140Arms........................................................................
2.4 Power Output and Efficiency Characteristics At 140Arms.........................................................
Appendix A: Measured Point of Simulation Circuit (1/2)...........................................................
Appendix A: Measured Point of Simulation Circuit (2/2)...........................................................
Appendix B: Evaluation Text......................................................................................................
Appendix C: Gate Signal for Six-Step Control...........................................................................
Appendix D: 3-Phase AC Motor Model Text (1/2).....................................................................
Appendix D: 3-Phase AC Motor Model Text (2/2).....................................................................
Appendix E: Simulation Settings................................................................................................
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2All Rights Reserved Copyright (C) Bee Technologies Inc. 2012
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
1.1) Manufacturer Specification
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 3
• The Torque are defined by :
At 140Arms (Rated Continuous Current)
KT = 1.6 Lb-in/A
Tphe = 1.6 140 = 224Lb-in
Te = 224*3= 672Lb-in
• The Back-EMF are defined by :
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
1.2) Torque and Back-EMF
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 4
wTw
vTv
uTu
IKT
IKT
IKT
mEw
mEv
mEu
KE
KE
KE
phe : u, v, w
Vphe : Phase voltage applied from inverter to motor
VAC : Operating voltage range (Maximum voltage)
VBAT : DC Voltage applied from battery
Iphe : Phase current
Tphe : Electric torque produced by u, v, w phase
Te : Electric torque produced by motor
Ephe : Phase Back-EMF
KE : Back-EMF constant KT : Torque constant
ωm : Angular speed of rotor
1 Pound Inch equals 0.11 Nm
TwTvTueT
(1)
(2)
(3)
1.3) Simplified 3-Phase AC Motor Model
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 5
L 11 2
B E M F 1R 1
L 21 2
B E M F 2R 2
L 31 2
B E M F 3R 3
N 0
U
V
W
Phase Resistance (L-L) : 0.0125ΩPhase Inductance :
105uH: 110uH
Frequency Response
105uH
110uH
Fig.2 Phase-to-GroundFig. 1 Scheme of the 3-Phase Model
1.4) The 3-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 motor's terminals as the windings move through the motor's magnetic field.
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 6
|Z| - Frequency Back-EMF Voltage
Mechanical part
Fig. 3 Three-Phase AC Motor Equivalent Circuit
PARAMETERS:
KT = 1.6KE = 0.02
LL = 105URLL = 0.0125
PARAMETERS:LOAD = 140
U3
1 2S
PT
Q
emf_u
0
IN+IN-
OUT+OUT-
eu
0
IN+IN-
OUT+OUT-
0
IN+IN-
OUT+OUT-
0
lim_v
IN+IN-
OUT+OUT-
0
0
IN+IN-
OUT+OUT-
lim_w
0
emf_vev
emf_u
-+ +
-
E2
0emf_v
emf_wew-+ +
-
E3
emf_w0
n1
tu
0
tv
0
tw
N0
n2
U
n3W
V
Vu
speed
IN+IN-
OUT+OUT-
0
mul
Vv
torque
Vw
-+ +
-
E1
0
0
IN+IN-
OUT+OUT-
0
IN+IN-
OUT+OUT-
0
lim_u
sp_v
sp_u
sp_usp_w
sp_wsp_v
U11 2
SP
TQ
U2
1 2S
PT
Q
1.5) Parameters Settings
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 7
LOAD : Load current each phase of motor [Arms]– e.g. LL = 125Arms, 140Arms, or 400Arms
LL : Phase inductance [H]– e.g. LL = 10mH, 100mH, or 1H
RLL : Phase resistance (Phase-to-phase) [Ω]– e.g. RLL = 10mΩ, 100mΩ, or 1Ω
KE : Back-EMF constant [V/RPM]– e.g. KE= 0.01, 0.05, or 0.1
KT : Torque constant [Lb-in/A]– e.g. KT= 0.1, 0.5, or 1
1 Pound Inch equals 0.11 Nm
Model Parameters:
Fig. 4 Symbol of 3-Phase Induction Motor
• From the 3-Phase Induction Motor specification, the model is characterized by setting parameters LL, RLL, KE, KT and LOAD.
M N 0
U 1M E 0 9 1 3
L L = 1 0 5 U
L O A D = 1 4 0K T = 1 . 6K E = 0 . 0 2R L L = 0 . 0 1 2 5
1
2
3
4
2) Simulation Circuit of 3-Phase AC Motor Model
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 8
• Fig.5 Analysis of motor operation powered by alternating voltage variation involves using the model of three-phase induction motor.
N 0N 0
R U
R V
R W
U 2G D R VU
D
UP
VDVP
WD
WP
RU, RV, RW: 173.75m
U P U D V DV P W P W D
V 11 0 2 V +
-
+
-
S 1 D 1D M O D _ 0 1
+
-
+
-
S 2 D 2D M O D _ 0 1
U P
U D
0
0
+
-
+
-
S 3
M N 0
U 1M E 0 9 1 3
L L = 1 0 5 U
L O A D = 1 4 0K T = 1 . 6K E = 0 . 0 2R L L = 0 . 0 1 2 5
1
2
3
4
D 3D M O D _ 0 1
+
-
+
-
S 4 D 4D M O D _ 0 1
V P
V D
0
0
+
-
+
-
S 5 D 5D M O D _ 0 1
+
-
+
-
S 6 D 6D M O D _ 0 1
W P
W D
0
0
U
0
V
W
V 21 0 2 V
2.1) Phase Current Characteristics Under Load Variation - Simulation Results
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 9
Fig. 6 Current Characteristics under load Condition
Time
0s 500msI(RU)/SQRT(2)
-500A
0A
500A Time
0s 500msI(RU)/SQRT(2)
-500A
0A
500A
Time
0s 500msI(RU)/SQRT(2)
-500A
0A
500A
Load 50Arms
Load 140Arms
Load 200Arms
Reference of Phase U
Time
0s 500msV(X_U1.EU)
-200V
-100V
0V
100V
200V Time
0s 500msV(X_U1.EU)
-200V
-100V
0V
100V
200V Time
0s 500msV(X_U1.EU)
-200V
-100V
0V
100V
200V
2.2) Back-EMF Characteristics Under Load Condition - Simulation Results
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 10
Fig. 7 Back-EMF Characteristics under load Condition
Load 50Arms
Load 140Arms
Load 200Arms
Reference of Phase U
Time
0s 500msV(X_U1.tu)
0V
0.5KV
1.0KV
(446.486m,223.728)
V(X_U1.speed)0V
1.0KV
2.0KV
3.0KV
4.0KV
SEL>>
(464.146m,3.2311K)
2.3) Speed and Torque Characteristics At 140Arms- Simulation Results
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 11
Fig. 8 Speed and Torque Characteristics at Load=140Arms
The Load 140(Arms) is Rated Continuous Current
Tphe: Electric torque produced by each phase
RPM
Lb-in
Reference of Phase U
Time
0.5s 1.0s100*( (RMS(V(U,N0))*RMS(I(RU))) / (RMS(V(RU:1,N0))*RMS(I(RU))) )
0
50
100
(962.500m,81.941)
RMS(V(RU:1,N0))*RMS(I(RU))0W
10KW
20KW
SEL>>
(960.616m,13.662K)
2.4) Power Output and Efficiency Characteristics At 140Arms- Simulation Results
All Rights Reserved Copyright (C) Bee Technologies Inc. 2012 12
Fig. 9 Power Output and Efficiency Characteristics at Load=140Arms
At Load=140Arms, Power Output ≈ 13.7 [KW]
At Load=140Arms, Efficiency ≈ 82 [%]
Watt
[%]
Reference of Phase U