The document summarizes an SPICE model of a 3-phase AC motor that can accurately reproduce: (1) frequency characteristics (impedance characteristics), (2) reverse electromotive force characteristics, and (3) physical characteristics. It provides details on parameter settings for the model, the simulation circuit diagram, and simulation results showing characteristics like phase current, back-EMF, speed, torque, power output, and efficiency under varying load conditions.

1. SPICE Model of
3-Phase AC Motor
等価回路モデルでのご提供で下記の3項目に対して、再現性があります。
(1)周波数特性(インピーダンス特性)
(2)逆起電力特性
(3)物理的特性
2012年8月7日
株式会社ビー・テクノロジー
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2. 1) 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 0.1
Fig.1 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.
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3. 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
4
N0
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.2 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
Q1-Q6: IGBT,MOSFET and so on
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4. 2.1) Phase Current Characteristics Under Load Variation
- Simulation Results
Load 50Arms
Load 140Arms
Load 200Arms
 Reference of Phase U
Fig. 3 Current Characteristics under load Condition
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5. 2.2) Back-EMF Characteristics Under Load Condition
- Simulation Results
Load 50Arms
Load 140Arms
Load 200Arms
 Reference of Phase U
Fig. 4 Back-EMF Characteristics under load Condition
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6. 2.3) Speed and Torque Characteristics At 140Arms
- Simulation Results
The Load 140(Arms) is Rated Continuous Current
RPM
Tphe: Electric torque produced by each phase
Lb-in
 Reference of Phase U
Fig. 5 Speed and Torque Characteristics at Load=140Arms
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7. 2.4) Power Output and Efficiency Characteristics At 140Arms
- Simulation Results
At Load=140Arms, Power Output ≈ 13.7 [KW]
Watt
At Load=140Arms, Efficiency ≈ 82 [%]
[%]
 Reference of Phase U
Fig. 6 Power Output and Efficiency Characteristics at Load=140Arms
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8. Appendix A: Measured Point of Simulation Circuit
Simple Circuit of 3-Phase Induction Motor
Control System
V1 S1 D1 S3 D3 S5 D5 For easy calculation
102V + DMOD_01 + DMOD_01 + DMOD_01
RV, RW = Vac/Ipk(rms) - (0.5⋅RLL)
UP + VP + WP +
- - - - - - RU,
0 0 0 U1
ME0913
RU U 1
4
N0 Inverter
RV
RW
V
W
2
3
M N0
N0
RU, RV, RW: 173.75m
V2
102V Phase Current I(Rphe) 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
Load Variation
0 Parameter
Gate Drive Signal
UP UD VP VD WP WD
U2
UP
VP
WP
UD
VD
WD
GDRV
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