Rare earth reduction using a novel variable magnetomotive force, flux intensified IPM machine

Kato, Takashi; Limsuwan, Natee; Yu, Chen-Yen; Akatsu, Kan; Lorenz, Robert D.

doi:10.1109/ecce.2012.6342231

Cited by 25 publications

(20 citation statements)

References 7 publications

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“…The transient voltage that can be applied with a 3 phase, 2 level voltage source inverter with third harmonic injection space vector PWM is shown as the inverter voltage hexagon, which is fixed in the stationary frame and rotates in the synchronous frame. The voltage equations of the machine in the stationary frame come from Faraday's law as in (1) and (2). The reference frame speed dependent cross-coupling terms appearing in the synchronous frame voltage equations, (3) and (4), are due to the reference frame transform.…”

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: 96%

“…Changes in  pm have been achieved by active control using pulses of d-axis stator current, i d , to manipulate the magnetization state (MS) of low coercive force magnets [2][3][4][5].…”

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

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

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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“…An observer-based current decoupling method without a lookup table is developed in this paper for pulsation torque mitigation during magnetization state manipulation. Simulation and experimental results with the VFI-IPMSM designed in [5] and [6] will be used to evaluate the effectiveness of the proposed method. The machine geometry is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, maximum torque capability cannot be fully utilized. A combined concept of flux-intensified machine and variable-flux (VF) properties has been proposed recently [5], [6] to cope with this issue. In the VF-intensified interior PM synchronous machine (VFI-IPMSM), positive reluctance torque can be produced with positive i d current.…”

Section: Introductionmentioning

confidence: 99%

Variable-Flux Machine Torque Estimation and Pulsating Torque Mitigation During Magnetization State Manipulation

Fukushige

Limsuwan

et al. 2014

IEEE Trans. on Ind. Applicat.

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This paper focuses on dynamic control, under loaded conditions, of the magnetization state of suitably designed variableflux (VF) permanent-magnet (PM) machines. Such VF-PM machines have been shown to achieve low loss operation over a wide range of load and speed. For this type of machine, the PM flux linkage varies during the magnetization manipulation process. Published magnetization techniques have occurred at zero load conditions and thus did not generate torque pulsations. However, under loaded conditions, the existing methods would produce unwanted torque pulsation. This paper proposes a parameter insensitive method to solve this issue. This method generates a decoupling current command that is calculated from accurately estimated stator flux linkage. Accurate flux estimation, i.e., insensitive to inductance saturation and PM flux linkage variation (e.g., temperature or magnetization level) is achieved by using the voltage disturbance estimated by a closed-loop stator current vector observer. In both simulations and experiments, it is shown that even during magnetization processes under loaded conditions, the flux can be estimated correctly, and smooth torque output can be achieved.Index Terms-Magnetization state control, observed-based decoupling method, torque control, variable-flux machine, voltage disturbance state filter.

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Study and experimental performance evaluation of flux intensifying PM motor with variable leakage magnetic flux

Aoyama

Noguchi

2019

Electrical Engineering Japan

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This paper describes a flux intensifying permanent-magnet (PM) motor with variable leakage magnetic flux. The unique feature of this proposed motor is the ability to passively adjust the magnetic flux linkage into the armature windings in proportion to the armature magnetomotive force and/or armature current phase. The magnetic circuit topology of the flux intensifying PM motor and the passive variable leakage magnetic flux are determined through FE analysis. Then, the driving performance is experimentally elucidated through comparison with that of a reverse salient pole type (flux weakening) PM motor without variable leakage magnetic flux. K E Y W O R D S armature current phase, flux intensifying, IPMSM, salient pole, variable leakage magnetic flux, variable magnetic flux 36

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Rare earth reduction using a novel variable magnetomotive force, flux intensified IPM machine

Cited by 25 publications

References 7 publications

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

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

Variable-Flux Machine Torque Estimation and Pulsating Torque Mitigation During Magnetization State Manipulation

Study and experimental performance evaluation of flux intensifying PM motor with variable leakage magnetic flux

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