Input Impedance and Losses of Induction Motors Operating from Inverters

Yokozuka, Tsutomu; Baba, Eiji; Takatsuki, Takashi; Miyaki, Atsushi

doi:10.1541/ieejias.117.1254

Cited by 4 publications

(7 citation statements)

References 1 publication

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“…x C : capacitor reactance s k P : slip of k-th harmonic positive sequence s k N : slip of k-th harmonic negative sequence s: slip of fundamental positive sequence K R : resistance increase coefficient due to skin effect [13] K X : inductance decrease coefficient due to skin effect [13]…”

Section: Conclusion and Future Topicsmentioning

confidence: 99%

“…A capacitor is always connected in series to the auxiliary winding (including startup). Even when the equivalent circuit of an induction motor in the harmonic domain is based on the equivalent circuit in the fundamental domain, the circuit constants must be corrected with regard to the rotor's skin effect, stray load, and other factors [13]. Thus, it is difficult to analyze both the fundamental and harmonic domains with a single equivalent circuit.…”

Section: A1 Model Configuration Of Single-phase Induction Motormentioning

confidence: 99%

“…In order to verify the estimation of impedance by the proposed method, we calculate the harmonic impedance of a single-phase induction motor with consideration of the skin effect [13]. For simplicity, we ignore the influence of harmonic currents produced by the capacitor motor.…”

Section: A2 Harmonic Impedance Of Single-phase Induction Motormentioning

confidence: 99%

See 2 more Smart Citations

Basic Study on Islanding Detection Method for PV Systems by Harmonic Impedance Detection in Case of Including Induction Motor in Load System

Yoshida

Suzuki

Fujiwara

et al. 2015

Electrical Engineering Japan

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SUMMARY It is important that photovoltaic (PV) systems detect islanding caused by power system faults to ensure electrical safety. Thus we propose a novel islanding detection method which detects the harmonic impedance by injecting harmonic currents synchronized with the exciting current harmonics of the pole transformer. For the case in which an induction motor load is included in the load system, basic experiments on islanding detection and simulation analysis are conducted to verify the effectiveness of the proposed method.

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Section: Conclusion and Future Topicsmentioning

confidence: 99%

Section: A1 Model Configuration Of Single-phase Induction Motormentioning

confidence: 99%

See 1 more Smart Citation

Basic Study on Islanding Detection Method for PV Systems by Harmonic Impedance Detection in Case of Including Induction Motor in Load System

Yoshida

Suzuki

Fujiwara

et al. 2015

Electrical Engineering Japan

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show abstract

“…The error is in the form of a linear angle error, such as (13) and (16). This error can be driven away using the scheme as shown in Fig.…”

Section: Case 2-high-frequency Current Injectionmentioning

confidence: 99%

“…Due to the skin effect at high frequency, the value of rotor resistor is dozens of times as large as that at fundamental frequency and, by the skin effect, the value of becomes much smaller at high frequency than that at fundamental frequency [16]. Thus, because the contribution of rotor resistance term to the terminal impedance is increased relative to the reactance term, it is apparent that the difference between the -and -axes terminal impedance is detectable (10) Hence, for the fluctuating signals in the synchronously rotating reference frame, the impedance measured on the rotor flux axis differs from that on the quadrature axis to the rotor flux.…”

Section: Introductionmentioning

confidence: 99%

Sensorless field-orientation control of an induction machine by high-frequency signal injection

Park

Sul

1999

IEEE Trans. on Ind. Applicat.

250

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This paper describes a new scheme to find the rotor flux angle from stator voltages and currents by injecting high-frequency signal. The signal is not a rotating one, but a fluctuating one at a synchronous rotating reference frame with the fundamental stator frequency. When the estimated rotor flux angle coincides with the actual angle, the proposed method makes virtually no ripple torque, no vibration, and less audible noise caused by the injected signal. The difference of impedances between the flux axis and the quadrature axis at highfrequency signal injection on the rotor flux angle is explained by the equivalent circuit equation of the induction machine. The difference is verified by experiments on the test motors at various testing conditions. The sensorless field-orientation algorithm is proposed, and the experimental results clarify the satisfactory operation of the algorithm with 150% load torque at zero stator frequency.

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Physical understanding of high frequency injection method to sensorless drives of an induction machine

Park

Sul²

2000

Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on In

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Input Impedance and Losses of Induction Motors Operating from Inverters

Cited by 4 publications

References 1 publication

Basic Study on Islanding Detection Method for PV Systems by Harmonic Impedance Detection in Case of Including Induction Motor in Load System

Basic Study on Islanding Detection Method for PV Systems by Harmonic Impedance Detection in Case of Including Induction Motor in Load System

Sensorless field-orientation control of an induction machine by high-frequency signal injection

Physical understanding of high frequency injection method to sensorless drives of an induction machine

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