Flux-linkage calculation in permanent-magnet motors using the frozen permeabilities method

Walker, J.A.; Dorrell, David G.; Cossar, C.

doi:10.1109/tmag.2005.854973

Cited by 127 publications

(41 citation statements)

References 2 publications

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“…The induced mutual flux linkages in all phases can be determined by running frozen permeability finite element simulations for each phase in turn. 4,5 The mutual, self-, and total flux linkages for phases 1 and 4 ͑determined from a combination of nonlinear and frozen permeability solutions͒, for windings polarities of N-S-N-S are given in Figs. 4 and 5, respectively.…”

Section: Finite Element Modeling Of Mutual Couplingmentioning

confidence: 99%

Effect of mutual coupling on torque production in switched reluctance motors

Walker

Dorrell

Cossar

2006

Journal of Applied Physics

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In many cases, the normal operation of switched reluctance machines requires excitation of two or more phases simultaneously. When multiple phases are conducting simultaneously, the flux paths from each phase will overlap, which may lead to localized saturation. In such cases, the flux linkage must be considered a function not just of the current in the test winding but of all excited windings. The degree of mutual coupling between phases influences the per-phase magnetization curves and torque characteristics. In machines with even phase numbers, the degree of mutual coupling between phases varies due to discontinuities in the phase polarity arrangement. From nonlinear finite element simulations, it is possible to compare the i -loop diagrams under single-phase and multiphase excitations, and hence the torque produced. The mutual flux linkage from each phase can be calculated separately for each rotor position using the frozen permeability method, to further analyze the mutual coupling effects. For a given excitation current profile, the torque can be maximized by careful arrangement of the phase polarities.

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Section: Finite Element Modeling Of Mutual Couplingmentioning

confidence: 99%

Effect of mutual coupling on torque production in switched reluctance motors

Walker

Dorrell

Cossar

2006

Journal of Applied Physics

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“…Figure 5a shows the total magnetic flux distributions of proposed model under no-load condition. In addition, the frozen permeability method (FPM) [18] is used to obtain the separated magnetic flux produced by the rotor field windings (FWs) or produced by the assisted-PM, as indicated in Figure 5b,c. It is observed that the magnetic flux direction of the PM in the rotor core is opposite to that produced by the FWs.…”

Section: Principlementioning

confidence: 99%

Design and Optimization of a Novel Wound Field Synchronous Machine for Torque Performance Enhancement

2018

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This paper presents the design and optimization of a novel wound field synchronous machine topology, in which permanent magnets (PMs) are introduced into the rotor slot opening with segment configuration for high quality output torque performance. The rotor shape of the proposed PM-assisted wound field synchronous machine with segment configuration is optimized for maximizing the average output torque and decreasing torque ripple under constant PM volume and motor size. The segment configuration can be benefit to improve the reluctance torque. In addition, it is further clarified that the assisted-PM can help to increase the field torque by enlarging the magnetizing synchronous reactance (X f ), as well as increasing airgap flux density. An optimal method combining Kriging method and genetic algorithm is applied for rotor shape optimization of proposed PM-assisted wound field synchronous machine (PMa-WFSM). Then, the 2-D finite-element analysis results, with the aid of JMAG-Designer, are used to confirm the validity. It is determined that the average output torque is improved by 31.66%, and keeps lower torque ripple without decreasing efficiency, increasing PM volume and motor size compared with those of the basic model. Finally, irreversible demagnetization and mises stress analysis verifies the reliability of the novel topology.

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“…This is achieved using the frozen permeability method as described in the following. Such a technique has been used in the past for different purposes: to model the electrical machine under saturated conditions [22], to weigh the flux linkage contributions to the average torque [23], and to segregate the torque components [24]. In all these works, only magnetostatic analysis has been adopted for their purpose, since the high frequency analysis was not considered.…”

Section: Finite Element Simulationsmentioning

confidence: 99%

Finite-Element Analysis of Electrical Machines for Sensorless Drives With High-Frequency Signal Injection

Alberti

Morandin

Gyselinck

2014

IEEE Trans. on Ind. Applicat.

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Abstract-A challenge during the design process of an electrical machine is the characterization of the various parameters in a computational time as short as possible. Frequently it is required the computation of the electrical machine parameters which are necessary for the tuning of the drive control algorithm. This paper deals with a strategy to compute the high frequency signal injection response of a sensorless controlled electrical machine. It allows to determine the self-sensing capability of the machine directly during the design process. Such a capability can be defined in any given operating point, for example along the Maximum Torque Per Amps trajectory. Then, also the high frequency machine parameters can be computed.In addition, the strategy proposed here requires a very short computational time to get such a data. After a magnetostatic field analysis, carried out so as to get the torque for a given current, the flux density distribution is stored and the differential reluctivity tensor is evaluated in each element of the mesh. Then, a time-harmonic analysis is carried out in a linearized structure so as to compute the d-q parameters at the injection frequency.In order to validate the proposed procedure, experimental results on different machine type are included in the paper. This allows to prove the reliability of the procedure as a valued tool for the characterization of the machine.

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Flux-linkage calculation in permanent-magnet motors using the frozen permeabilities method

Cited by 127 publications

References 2 publications

Effect of mutual coupling on torque production in switched reluctance motors

Effect of mutual coupling on torque production in switched reluctance motors

Design and Optimization of a Novel Wound Field Synchronous Machine for Torque Performance Enhancement

Finite-Element Analysis of Electrical Machines for Sensorless Drives With High-Frequency Signal Injection

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