Efficiency Contours and Loss Minimization Over a Driving Cycle of a Variable Flux-Intensifying Machine

Fukushige, Takashi; Limsuwan, Natee; Kato, Takashi; Akatsu, Kan; Lorenz, Robert D.

doi:10.1109/tia.2015.2404918

Cited by 90 publications

(22 citation statements)

References 7 publications

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“…Such a mismatch of the single operation design method and multiple driving conditions may result in a narrow constant power speed range and low overall efficiency in the entire operation region [9][10][11][12][13]. Thus, the vector control method is introduced to adjust the d-axis current, hence realizing different magnetization states of a variable-flux flux-intensifying interior PM machine to obtain increased efficiency over a driving cycle [14]. However, requirements of precision control are relatively enhanced and the speed range is limited by the inverter capability.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of Permanent Magnet Brushless Machines for Electric Vehicle Applications

Zhu

et al. 2015

Energies

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In this paper, by considering and establishing the relationship between the maximum operating speed and d-axis inductance, a new design and optimization method is proposed. Thus, a more extended constant power speed range, as well as reduced losses and increased efficiency, especially in the high-speed region, can be obtained, which is essential for electric vehicles (EVs). In the first step, the initial permanent magnet (PM) brushless machine is designed based on the consideration of the maximum speed and performance specifications in the entire operation region. Then, on the basis of increasing d-axis inductance, and meanwhile maintaining constant permanent magnet flux linkage, the PM brushless machine is optimized. The corresponding performance of the initial and optimal PM brushless machines are analyzed and compared by the finite-element method (FEM). Several tests are carried out in an EV simulation model based on the urban dynamometer driving schedule (UDDS) for evaluation. Both theoretical analysis and simulation results verify the validity of the proposed design and optimization method.

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Section: Introductionmentioning

confidence: 99%

Design and Optimization of Permanent Magnet Brushless Machines for Electric Vehicle Applications

Zhu

et al. 2015

Energies

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“…The CV is initially at a valid steady state operating point within the rated current circle and steady state voltage ellipse. During the [8] first half of the trajectory (denoted by circle 1), the current MS is not equal to the desired MS*, and the only constraint is that the transient voltage required by the trajectory cannot exceed the inverter voltage limit. It is important to note, as was seen in [10], the trajectory may move outside of the steady voltage ellipse when transient voltage components partially cancel steady state voltage components.…”

Section: Process Of Increasing Magnetization State (Ms) In Variabmentioning

confidence: 99%

“…These machines can operate with reduced  pm at high speed, which reduces the requirement for flux weakening current [1][2][3][4][5][6][7]. [8] showed a 30% reduction in losses over an urban driving cyele by using different levels of  pm .…”

Section: Introductionmentioning

confidence: 99%

“…This is shown in Fig. 2 for a prototype-scale variable flux, flux intensifying interior permanent magnet synchronous machine (VFI-IPMSM) from [8], where (a) shows the efficiency map using optimal MS, and (b) shows the selected optimal MS value. In effect, changing MS can be thought of as an investment (i.e., some energy is consumed during the current pulse), and flux-weakening current as a charge for operating at high speed (additional negative i d current causes copper losses that must be paid for continuously).…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Magnetizing Trajectories for Variable Flux PM Synchronous Machines Considering Voltage, High-Speed Capability, Torque Ripple, and Time Duration

Gagas

Sasaki

Fukushige

et al. 2016

IEEE Trans. on Ind. Applicat.

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This paper discusses various transient trajectories for increasing the magnetization state (MS) of variable flux permanent magnet synchronous machines (VF-PMSMs), a class of PMSM where the magnets are demagnetized and remagnetized using the drive inverter during drive cycle operation. To manipulate MS, a magnetizing current pulse can be used, which may drive a large amount of flux linkage in the machine. As a result, above low speed operation, a large voltage may be required from the inverter. This paper extends several existing methods for improved voltage properties, and proposes and experimentally evaluates a new method  a straight line stationary frame flux linkage trajectory (SL s T)  for higher speed capability. The presented trajectories, along with existing trajectories, are organized into families and compared regarding their required voltage, high speed capability, torque ripple, and time duration.

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“…In [18], three families of magnetizing trajectories can be identified, which is used to further extend the speed range, and the high efficiency control over an overall operating range can be achieved with a hysteresis controller for the MS operating algorithm. Besides, a flux-linkage observer based current decoupling method [19]- [20] was used to minimize the torque ripple during the magnetization transients. The MS manipulation can be implemented at zero speed, zero load condition by using voltage disturbance state filter to correct the estimates from a flux observer.…”

mentioning

confidence: 99%

Stepwise Magnetization Control Strategy for DC-Magnetized Memory Machine

Yang

Lyu

Lin

et al. 2019

IEEE Trans. Ind. Electron.

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Efficiency Contours and Loss Minimization Over a Driving Cycle of a Variable Flux-Intensifying Machine

Cited by 90 publications

References 7 publications

Design and Optimization of Permanent Magnet Brushless Machines for Electric Vehicle Applications

Design and Optimization of Permanent Magnet Brushless Machines for Electric Vehicle Applications

Analysis of Magnetizing Trajectories for Variable Flux PM Synchronous Machines Considering Voltage, High-Speed Capability, Torque Ripple, and Time Duration

Stepwise Magnetization Control Strategy for DC-Magnetized Memory Machine

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