Impact of the Inverter DC Bus Voltage on the Iron Losses of a Permanent Magnet Synchronous Motor at Constant Speed

Denis, Nicolas; Wu, Yenyi; Fujisaki, Keisuke

doi:10.1541/ieejjia.6.346

Cited by 10 publications

(13 citation statements)

References 12 publications

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“…22). This result has the same trend with the ones in no-load test shown in [22]. Obviously, it is not appropriate to set a large value for V dc (e.g.…”

Section: Appendixsupporting

confidence: 76%

“…According to [22,23], once the IPMSM speed is fixed, the PWM voltage modulation index m can be adjusted by manually tuning the DC-link voltage V dc and estimated as…”

Section: Measurement Methods For Core Loss Of Ipmsmmentioning

confidence: 99%

“…Besides, the DC‐link voltage V dc for the PWM inverter excitation is manually set to be equal to the measured average of V dc under the PAM 120° inverter excitation at the steady state; this corresponds to that the voltage modulation index m of the PWM inverter is about 1.1. In fact, there are no existing studies which considered the PWM inverter with a very large value of m = 1.1 on evaluating the IPMSM core loss in both no‐load and load cases; existing related works in [3, 22–24] only considered the motor core loss with m <1 or/and in no‐load tests. (iii) The experimental IPMSM system in this research is operated in no‐load and various load conditions. Effects of changes in the motor rotational speed and load torque on the motor core loss, copper loss and magnetic flux density are examined in many test cases.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of motor core loss, copper loss and magnetic flux density with PAM inverter under dissimilar excitation angles

Thao

Zhong

Fujisaki

et al. 2020

IET Electric Power Applications

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This study is the first research to present a detailed assessment of core loss, copper loss and magnetic flux density of the interior permanent magnet synchronous motor (IPMSM) with pulse-amplitude modulation (PAM) inverter under different excitation angles in both no-load and load conditions. The PAM method automatically controls the amplitude of changeable DClink voltage, and the excitation angle for switches in the inverter is varied from 120° to 180° according to a 12-step switching pattern designed particularly for the PAM-based inverter of IPMSM. For reference purpose, the pulse-width modulation excitation with a very high voltage modulation index is performed. Various conditions with changes in speed and torque are examined. Experimental results show that harmonic components produced by the PAM inverter in the IPMSM current, voltage and magnetic flux density have large effects on the motor core and copper losses; physics-based explanations and insights are also presented. The PAM under 135° excitation angle has an excellent performance in reducing IPMSM core and copper losses since it can significantly decrease the harmonic components in motor current, voltage and magnetic flux density. Furthermore, simulations using the finite element method are conducted to validate the experimental results of IPMSM core loss with the PAM excitations. Nomenclature PAM 120°PAM inverter under 120° excitation angle PAM 135°PAM inverter under 135° excitation angle PAM 150°PAM inverter under 150° excitation angle PAM 165°PAM inverter under 165° excitation angle PAM 180°PAM inverter under 180° excitation angle PWM 10 kHz PWM inverter with 10 kHz carrier frequency

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“…22). This result has the same trend with the ones in no-load test shown in [22]. Obviously, it is not appropriate to set a large value for V dc (e.g.…”

Section: Appendixsupporting

confidence: 76%

“…According to [22,23], once the IPMSM speed is fixed, the PWM voltage modulation index m can be adjusted by manually tuning the DC-link voltage V dc and estimated as…”

Section: Measurement Methods For Core Loss Of Ipmsmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of motor core loss, copper loss and magnetic flux density with PAM inverter under dissimilar excitation angles

Thao

Zhong

Fujisaki

et al. 2020

IET Electric Power Applications

Self Cite

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“…Accordingly, m is equal to 0.241 in the no-load condition and 0.266 in the load condition. The increase of the voltage modulation index not only efficiently increases the fundamental voltage but also has the adverse effect of increasing the amplitudes of the PWM high order harmonics (9) . In this study, the effect of the higher values for the voltage modulation index on the iron losses of the motor will be presented and examined in Section 6.…”

Section: Analysis Of the Phase Voltagementioning

confidence: 99%

“…Furthermore, an analytical model has been developed to evaluate the impact of the load on the rotor iron losses of a high-speed permanent magnet synchronous motor (PMSM) (8) ; this research showed that the load can sensibly increase the rotor iron losses. Impacts of PWM voltage modulation index on motor iron losses in only the no-load condition were shown in (9) (10) . Nevertheless, the impact of the load on motor iron losses has not been enough considered.…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Load Torque on the Iron Losses of Permanent Magnet Motors by using Finite Element Analysis

Thao

Denis

et al. 2019

IEEJ Journal IA

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The output torque of a three-phase interior permanent magnet synchronous motor (IPMSM) can be controlled within its allowable range using a pulse-width modulation (PWM) DC-AC inverter. In this paper, the effect of load torque on the iron losses of an IPMSM is studied by considering three different driving conditions, namely no-current, noload, and load conditions. In order to perform a careful evaluation in the experiments, the motor is tested at various rotational speeds, namely 750 min −1 , 1500 min −1 , and 2250 min −1 ; the voltage modulation index of the PWM inverter and the load torque are also varied. The experimental results in all the test cases show that the iron losses of the motor vary when the excitation condition is varied among the no-current, no-load, and load cases. Furthermore, a three-dimensional (3D) finite element analysis (FEA) is performed for the main test case when the motor is operated at the rated speed of 750 min −1 for reference purpose. The harmonic components caused by the excitation inverter in the stator voltage, current, and magnetic flux density are found to be the main reasons for the increase in iron losses of the motor in the no-load and load conditions compared to the no-current condition; an increase in torque also causes a relatively significant increase in the iron losses.Keywords: finite element analysis, interior permanent magnet synchronous motor, iron loss, PWM inverter, effect of load torque

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Iron Loss Measurement of Interior Permanent Magnet Synchronous Motor

Denis¹

2019

Magnetic Material for Motor Drive Systems

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Impact of the Inverter DC Bus Voltage on the Iron Losses of a Permanent Magnet Synchronous Motor at Constant Speed

Cited by 10 publications

References 12 publications

Assessment of motor core loss, copper loss and magnetic flux density with PAM inverter under dissimilar excitation angles

Assessment of motor core loss, copper loss and magnetic flux density with PAM inverter under dissimilar excitation angles

Study of the Effect of Load Torque on the Iron Losses of Permanent Magnet Motors by using Finite Element Analysis

Iron Loss Measurement of Interior Permanent Magnet Synchronous Motor

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