| 1. |
- Falk Olson, Gustaf, 1992-, et al.
(author)
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Parameter Estimation of Multiphase Machines Applicable to Variable Phase-Pole Machines
- 2023
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In: IEEE transactions on energy conversion. - : Institute of Electrical and Electronics Engineers (IEEE). - 0885-8969 .- 1558-0059. ; 38:4, s. 2822-2831
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Journal article (peer-reviewed)abstract
- Variable phase-pole machines are envisioned in applications requiring a large torque-speed operating area. The control of these machines relies on accurate models and parameters but research on their parameter identification is scarce. This paper presents an offline parameter-identification method for variable phase-pole machines adopting a harmonic-plane decomposition model. The method employs standard tests with single-frequency three-phase excitation in multiple pole configurations and uses the results to minimize a constrained, regularized weighted least-squares problem. It relies on identifying a set of parameters common to all phase-pole configurations and transforming them into the adopted model. Good agreement is exhibited when comparing experimental results to an analytical harmonic-plane decomposition model using the inferred parameters. Steady-state, as well as pole transitions, are compared. The paper emphasizes the importance of performing measurements in multiple pole configurations and weighing these measurements appropriately to render an accurate set of parameters.
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| 2. |
- Wu, Yixuan, 1993-, et al.
(author)
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Detection of Multiple Open Faults in Variable Phase-Pole Machines based on Harmonic Plane Decomposition
- 2023
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In: 2023 IEEE 14th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED). - : Institute of Electrical and Electronics Engineers (IEEE).
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Conference paper (peer-reviewed)abstract
- Multiphase electrical machine are inherently truefault tolerant, which is a key difference as compared to conventionalthree-phase machines. The subgroup of variable phase-polemachines have the ability to change phase-pole configurationsonly through current control. Due to the higher availabilityand simpler construction, three-phase voltage source invertersmodules are often used for multiphase electrical machines.While many approaches exist for one single open-phase fault,this paper proposes an open-fault detection method capable todetect the failure of an entire three-phase module for variablephase-pole machines. It is an extension to the harmonic-planedecompositionfault detection analyzing the instantaneous spaceharmonic content of the current distribution. Simulation resultsdemonstrate the feasibility of the approach.
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| 3. |
- Wu, Yixuan, 1993-, et al.
(author)
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Pole-Transition Control of Variable-Pole Machines Using Harmonic-Plane Decomposition
- 2023
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In: IEEE Transactions on Industrial Electronics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0278-0046 .- 1557-9948. ; 70:8, s. 7753-7760
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Journal article (peer-reviewed)abstract
- Variable phase-pole machines have the potential to extend the operational range to higher speeds through magnetic pole changes. The state-of-the-art vector space decomposition cannot model the transient behavior of the pole change for any possible phase-pole configuration as it creates a discontinuity. The proposed harmonic plane decomposition theory solves this issue by generalizing the vector-space decomposition to the fullest extend by using its discrete Fourier transformation interpretation. The theory for indirect rotor field-oriented control is developed using the harmonic-plane decomposition. A controlled, loaded pole change on a wound independently-controlled stator-coils machine using two transition strategies shows the harmonic-plane decomposition-based controller’s ability to maintain torque in the transition. Additionally, the proposed controller accomplishes real harmonic injection and balanced steady-state operation.
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| 4. |
- Wu, Yixuan, 1993-, et al.
(author)
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Pole Transition Under Open Phase Fault Conditions in a Variable Pole Machine
- 2023
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In: IECON 2023 - 49th Annual Conference of the IEEE Industrial Electronics Society. - : Institute of Electrical and Electronics Engineers (IEEE).
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Conference paper (peer-reviewed)abstract
- A special subcategory of multiphase electrical ma-chines are the so called variable phase-pole machines. They have the ability to electronically change the number of pole- pairs without any hardware reconfiguration. Moreover, they are inherently fault tolerant due to the higher number of independent windings. These two virtues offer new possibilities for a drivetrain with higher power density and a new level of reliability. This paper presents an adapted post-fault controller performing a pole transition with an open-phase fault. The drive changes the number of pole-pairs without loosing the torque during the transition and minimizes the stator copper losses simultaneously. The validity of the presented control is shown in simulations.
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