Comparison Study of Induction Motor Models Considering Iron Loss for Electric Drives
Abstract
:1. Introduction
2. State Equations and Transfer Relations of the Models
3. Experimental Setup
4. Results and Discussion
4.1. Impedance Characteristics and Excitation Characteristics
4.2. ILS Characteristics
4.3. Dynamic Characteristics
5. Conclusions
- Under ideal no-load and heavy-load, the impedance and excitation characteristics of the series model were closer to the parallel model. Compared with the parallel model, the deviation of the excitation characteristics of the traditional model was small, that is, the observation error of the traditional flux observer was not large, and the torque control accuracy was greatly affected by the current control deviation.
- Compared with the parallel model, there was an error in estimating ILS using the series model, but the error was, approximately 20% constant, insensitive to load and frequency. As the error is easy to compensate, series model can be used directly as a loss model.
- The discretization of the parallel model required a smaller sampling time or a more accurate numerical algorithm. In the speed open-loop and constant V/F speed regulation process, the dynamic response smoothness of the series model was not as good as that of the traditional model due to the influence of the equivalent ILS parameter. However, the speed compensation of the state Equation and the ILS effect compensation of the torque Equation were significant. Therefore, the series model can effectively replace the complex parallel model to improve the control accuracy of the traditional model under the condition that the ILS resistance is described accurately.
Author Contributions
Funding
Conflicts of Interest
References
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Matrix | Levi Parallel Model | Hasegawa Series Model | Traditional Model |
---|---|---|---|
State matrix A | |||
Input matrix B |
Parameter | Rated Value | Parameter | Rated Value |
---|---|---|---|
Rs | 5.9 Ω | Rr | 5.6 Ω |
RFe0 | 1546 Ω | Rm0 ≈ ωs02Lm2/RFe0 | 19.31 Ω |
RM0 = Rm0/ωs0 | 0.061 Ω·rad/s | Lm | 0.55 H |
Ls | 0.574 H | Lr | 0.58 H |
n0 | 1500 r/min (1400 r/min) | tL0 | 7.5 N·m |
P0 | 1.1 kW | p0 | 2.0 kW |
Test Purposes | Methods and Conditions |
---|---|
Impedance characteristics | Plot and compare the Bode plots of the driving point admittances for the three models under ideal no-load, heavy-load, and locked-rotor conditions. |
Excitation characteristics | Plot and compare the Bode plots of the stator voltage excitation function for the three models under ideal no-load, heavy-load, and locked-rotor conditions. |
ILS characteristics | Plot and observe the characteristic curve of the ILS ratios of the series model and parallel model in the logarithmic coordinate system with the motor operating frequency changing under ideal no-load and heavy-load conditions. |
Dynamic characteristics | Plot and compare the dynamic response of the three models under speed regulation conditions with speed open-loop and constant V/F. From 0 to 0.5 s is the ramp response test, and the frequency rise from 0 to nominal value. After the speed stabilized, the rated load is applied at 1.5 s |
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Wang, K.; Huai, R.; Yu, Z.; Zhang, X.; Li, F.; Zhang, L. Comparison Study of Induction Motor Models Considering Iron Loss for Electric Drives. Energies 2019, 12, 503. https://doi.org/10.3390/en12030503
Wang K, Huai R, Yu Z, Zhang X, Li F, Zhang L. Comparison Study of Induction Motor Models Considering Iron Loss for Electric Drives. Energies. 2019; 12(3):503. https://doi.org/10.3390/en12030503
Chicago/Turabian StyleWang, Kang, Ruituo Huai, Zhihao Yu, Xiaoyang Zhang, Fengjuan Li, and Luwei Zhang. 2019. "Comparison Study of Induction Motor Models Considering Iron Loss for Electric Drives" Energies 12, no. 3: 503. https://doi.org/10.3390/en12030503