Research on Position Sensorless Control of RDT Motor Based on Improved SMO with Continuous Hyperbolic Tangent Function and Improved Feedforward PLL
Abstract
:1. Introduction
- (1)
- This study addresses SMO chattering by replacing the sign function with a continuous hyperbolic tangent function and selecting an appropriate boundary layer width. An observer based on the back-EMF model is developed to eliminate the LPF, reduce phase delay, and enhance the back-EMF signal estimation precision;
- (2)
- Through optimization of the traditional PLL structure and the addition of feedforward compensation, this study has successfully realized position extraction during bi-directional rotation of the motor, while significantly improving the accuracy of position extraction during acceleration and deceleration.
2. PMSM Mathematical Model
3. SMO Design for PMSM Rotor Position Estimation
4. Rotor Position and Speed Extraction
4.1. Traditional PLL Analysis
4.2. Improved PLL Analysis
- (1)
- Improve the inability of the conventional PLL to reliably extract position information during motor reversal;
- (2)
- During motor acceleration and deceleration, the conventional PLL’s error problem has been resolved.
5. Simulation Verification
5.1. Steady-State Performance
5.2. Dynamic Performance
5.3. Forward and Reverse
5.4. Performance under Ship Propeller Load
6. Conclusions and Outlook
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Parameter | Value |
---|---|
number of pole pairs p | 4 |
stator resistance | 2.875 |
stator inductor | 8.5 |
rotational inertia J | 0.001 |
permanent magnet flux | 0.175 |
DC voltage | 311 |
Parameter | Value |
---|---|
Propeller diameter /m | 0.1 |
Hull mass /kg | 100 |
Water attachment coefficient k | 1.1 |
Wake coefficient | 0.12285 |
Thrust derating coefficient t | 0.146 |
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Bai, H.; Yu, B.; Gu, W. Research on Position Sensorless Control of RDT Motor Based on Improved SMO with Continuous Hyperbolic Tangent Function and Improved Feedforward PLL. J. Mar. Sci. Eng. 2023, 11, 642. https://doi.org/10.3390/jmse11030642
Bai H, Yu B, Gu W. Research on Position Sensorless Control of RDT Motor Based on Improved SMO with Continuous Hyperbolic Tangent Function and Improved Feedforward PLL. Journal of Marine Science and Engineering. 2023; 11(3):642. https://doi.org/10.3390/jmse11030642
Chicago/Turabian StyleBai, Hongfen, Bo Yu, and Wei Gu. 2023. "Research on Position Sensorless Control of RDT Motor Based on Improved SMO with Continuous Hyperbolic Tangent Function and Improved Feedforward PLL" Journal of Marine Science and Engineering 11, no. 3: 642. https://doi.org/10.3390/jmse11030642