| 1. |
- Huang, Xiaoyan, et al.
(författare)
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A Robust Deadbeat Predictive Current Control Method for IPMSM
- 2024
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Ingår i: IEEE Transactions on Transportation Electrification. - : Institute of Electrical and Electronics Engineers (IEEE). - 2332-7782. ; , s. 1-1
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Tidskriftsartikel (refereegranskat)abstract
- Deadbeat predictive current control (DPCC) demonstrates excellent dynamic performance. However, in practical applications, its effectiveness is degraded by parameter mismatches and inverter nonlinearities. Among the various improvement methods addressed for these issues, incremental model-based DPCC (I-DPCC) achieves zero static current error with a low computational burden but suffers from instability under parameter variation, especially when applied to interior permanent magnet synchronous motors (IPMSMs). In this paper, a robust I-DPCC (RI-DPCC) combining feedforward control is proposed for IPMSM, with an adjustable stable operation range that can be extended to twice the actual inductance or even larger. To further improve the robustness of dynamic performance, an inductance correction method is introduced to track the variation of inductance during dynamic processes. Thus, the current commands can be well tracked even when significant inductance variation occurs. With sufficient voltage margin, the dynamic processes under mismatched inductance can be shortened to four control periods. Finally, experimental results validate the effectiveness of the proposed method.
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| 2. |
- Li, Zhaokai, et al.
(författare)
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Hybrid Analytical Model of Permanent Magnet Linear Motor Considering Iron Saturation and End Effect
- 2024
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Ingår i: IEEE transactions on energy conversion. - 0885-8969 .- 1558-0059. ; , s. 1-10
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Tidskriftsartikel (refereegranskat)abstract
- This paper proposed a hybrid analytical model for predicting the magnetic field distribution of slotted surface-mounted permanent magnet linear motor considering both iron saturation and end effect. In the proposed model, the segmented conformal mapping is developed to reduce the computation time while keeping same accuracy, especially when the end effect significantly affects the motor performance. Then, with the help of the magnetic circuit model in the primary and secondary iron, the magnetic potential drop of iron is obtained from the iterative calculation. The equivalent saturation current is introduced to represent the iron saturation and finally the performance of permanent magnet linear motor can be obtained considering both iron saturation and end effect. The proposed model expands the scope of the analytical models for the analysis of linear motors. The finite element analysis and experimental validation are carried out to show the effectiveness of the proposed model.
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| 3. |
- Chen, Zhuo, et al.
(författare)
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Reliability-Oriented Multi-Objective Optimization of Electrical Machines Considering Insulation Thermal Lifetime Prediction
- 2024
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Ingår i: IEEE Transactions on Transportation Electrification. - : Institute of Electrical and Electronics Engineers (IEEE). - 2332-7782. ; 10:1, s. 2264-2276
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Tidskriftsartikel (refereegranskat)abstract
- With the trend toward transportation electrification, the power density of electrical machines faces ever-increasing requirement owing to the stringent limit of weight, especially for aerospace applications. Conventionally, the reliability of electrical machines in such safety-critical application is guaranteed by considerable safety margins, i.e., the over-engineering approach, which prevents electrical machines from reaching higher power densities and leads to a design conflict. This paper proposes a reliability-oriented design approach for low-voltage electrical machines by integrating model-based lifetime prediction into a multi-objective optimization process. Accelerated thermal degradation tests are carried out on mainwall insulation and turn insulation, then the thermal degradation model is built to predict the lifetimes, accordingly. Thermal lifetime models are developed at several lifetime percentiles for both continuous duty and variable duty applications. Finally, a feasible reliability-oriented multi-objective optimization platform is established, based on which a study-case electrical machine for aerospace application is designed and optimized. The prototype is manufactured to verify the optimized performances.
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| 4. |
- Li, Zhaokai, et al.
(författare)
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Analytical Analysis of Quasi-Halbach Array Permanent-Magnet Motors Based on Field Separation Theory
- 2024
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Ingår i: IEEE Transactions on Transportation Electrification. - : Institute of Electrical and Electronics Engineers (IEEE). - 2332-7782. ; , s. 1-1
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Tidskriftsartikel (refereegranskat)abstract
- This paper proposes the field separation theory for predicting the magnetic field of a quasi-Halbach array permanent-magnet motor considering the magnetization pattern and iron saturation. According to the proposed method, the air-gap field consists of a permanent-magnet field, winding current field, and equivalent saturation field. The equivalent permanent-magnet currents replacing the Halbach array with radial or parallel magnetization are introduced to obtain the linear analytical air-gap field of the permanent magnets. The winding current field relating to the slot shape and air-gap length can be directly determined using the linear analytical model. The equivalent saturation field is derived from the combination of the linear analytical model in the air gap and the magnetic circuit model in the iron region. The finite-element analysis of an 8-pole/9-slot Halbach array permanent-magnet motor and its prototype experiments are carried out to verify the effectiveness of the field separation theory, which is then used to analyze the harmonic magnetic field of Halbach array permanent-magnet motors to further improve the electromagnetic torque estimation.
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| 5. |
- Li, Zhaokai, et al.
(författare)
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Design Comparison of Outer- and Inner-Rotor Permanent Magnet Motors for Hydrofoil Boat
- 2023
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Ingår i: 2023 IEEE International Electric Machines and Drives Conference, IEMDC 2023. - : Institute of Electrical and Electronics Engineers (IEEE).
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Konferensbidrag (refereegranskat)abstract
- This paper presents the design criteria of a permanent magnet motor for hydrofoil boat applications. Based on the dynamic analysis of hydrofoil boat, the constraints of propulsion motor are derived and therefore the surface-mounted permanent magnet motor is chosen as the competitive candidate. In order to have large power density in the permanent magnet motor, the outer- and inner-rotor motors are investigated and compared to demonstrate their advantages at different design constraints, which will provide the theoretical basis to improve the propulsion system in the hydrofoil boat from the perspective of motor design.
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| 6. |
- Li, Zhaokai, et al.
(författare)
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Hybrid Analytical Model for Predicting the Electromagnetic Losses in Surface-Mounted Permanent-Magnet Motors
- 2024
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Ingår i: IEEE Transactions on Transportation Electrification. - : IEEE Press. - 2332-7782. ; 10:1, s. 1388-1397
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Tidskriftsartikel (refereegranskat)abstract
- This article presents a comprehensive method to predict the electromagnetic losses in surface-mounted permanent-magnet (PM) motors based on a hybrid analytical model (HAM). HAM will significantly improve the calculation speed compared with finite-element method (FEM) while keeping great accuracy, making it a competitive alternative for the analysis and optimization of PM motors. As the accurate field distribution is the bias of electromagnetic losses prediction, the magnet loss, sleeve loss, and copper loss can all be accurately obtained from their vector potential distribution using HAM with small computational burden. As for iron loss, the improved Jiles–Atherton (JA) model is proposed to build the relationship between the loss and the magnetic field in the iron region from the perspective of energy conversion. The predictions of magnet loss, sleeve loss, and copper loss using HAM agree well with the FEM. The experiment on surface-mounted PM prototype demonstrates the high accuracy of iron loss calculation using the combination of the improved JA model and HAM.
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| 7. |
- Li, Zhaokai, et al.
(författare)
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The Scalable Analytical Model for Calculating the Magnetic Field of Surface-Mounted Permanent Magnet Motor
- 2024
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Ingår i: IEEE Transactions on Industrial Electronics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0278-0046 .- 1557-9948. ; , s. 1-11
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Tidskriftsartikel (refereegranskat)abstract
- This article develops a scalable analytical model that builds a relationship between any surface-mounted permanent magnet (SPM) motor and a general motor with variable slot-opening and air-gap length, considering both the saturation effect and slotting effect. It can not only give the performance of the single SPM motor but also show internal connection among different SPM motors regardless of the motor power and dimension. To account for the iron saturation, the equivalent saturation current combined with simplified BH curves of iron is introduced to directly present the iron magnetic potential distribution without an iterative process. Thus, the proposed model can be used as the surrogate model in the motor design with little computation and provide great insight into the relationship among motors with different power and dimension. Both finite-element analysis and experiment are carried out to validate the proposed model.
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| 8. |
- Liu, Ang, et al.
(författare)
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Nonlinear Analytical Model-Embedded Optimal Design for ER-PMSM
- 2024
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Ingår i: IEEE Transactions on Magnetics. - : IEEE Press. - 0018-9464 .- 1941-0069. ; 60:3, s. 1-5
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Tidskriftsartikel (refereegranskat)abstract
- This article proposed a nonlinear analytical model (NAM)-embedded optimal design procedure for permanent-magnet synchronous motors with an external rotor. Combined with the winding inductance calculation, a refined magnetic circuit is proposed for the analytical prediction of the electromagnetic performance. The stator nonlinearity, which is significant in torque prediction, is considered by using the conception of saturation current. Then, ant colony algorithm is employed for the multi-objective optimization for the great potential in global exploring. Finally, optimal design parameters are selected from the Pareto front. The effectiveness of the proposed optimization design method is verified by finite-element analysis (FEA) and experimental results of the manufactured prototype.
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| 9. |
- Shen, Yiming, et al.
(författare)
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Design Optimization and Comparative Study of Hybrid-Excited Flux Modulated Linear Machines with Different Slot Permanent Magnets
- 2023
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Ingår i: 2023 26th International Conference on Electrical Machines and Systems, ICEMS 2023. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 2822-2827
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Konferensbidrag (refereegranskat)abstract
- This paper introduces and conducts a comparative analysis of three types of hybrid-excited flux-modulated linear machines (HEFMLMs) equipped with slot permanent magnets. It establishes a comprehensive analytical model to facilitate a deeper understanding of the operational principles of these machines featuring different hybrid excitation patterns. The paper commences by elucidating the machine's topology and operational principles. Subsequently, it presents a unified analytical model based on the magnetomotive force-permeance model for calculation purposes. Furthermore, the paper examines the electromagnetic performance of these three HEFMLMs, encompassing open-circuit characteristics and thrust force characteristics. The investigation highlights the potential of hybrid excitation as an effective means to enhance thrust force density through the optimization of the distribution of optimal direct current and alternating current. In summary, the three proposed HEFMLMs offer unique advantages and demonstrate suitability for cost-effective, long-stroke direct-drive applications.
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| 10. |
- Xu, Xiaofeng, et al.
(författare)
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An Improved Rotor Position Estimation Method for SPMSM with Misaligned Hall-Effect Sensor
- 2024
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Ingår i: IEEE Transactions on Transportation Electrification. - : Institute of Electrical and Electronics Engineers (IEEE). - 2332-7782. ; 10:1, s. 735-743
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents an improved rotor positionestimation method for surface permanent magnet synchronousmotor (SPMSM) using a low-resolution Hall-Effect sensor. Firstly,an observation function is proposed to detect the speed variation,and a novel correction method based on optimization processis proposed to identify and correct the deviation angle causedby sensor misalignment. Then, an improved position observer isintroduced using a gain-scheduling controller to achieve betterperformance in both steady state and transient state. Theproposed method enhances the anti-perturbation and start-upcapability for SPMSM and compensate the misalignment effectof Hall-Effect sensors. Experimental results are demonstrated toverify the effectiveness of the proposed method.
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