Calculation of Negative Torque Caused by Slot Ripples of Induction Motors

Yamazaki, Katsumi; Haruishi, Y.; Ara, Takahiro

doi:10.1109/tmag.2004.824720

Cited by 18 publications

(9 citation statements)

References 5 publications

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“…Therefore, β must increase with B m in (1) and (2) [15]. However, the loss caused by the minor hysteresis loops is not a major component in the total core loss in most of rotating machines [12], [13], [16], [17]. Therefore, in this paper, β is assumed to be ΔB i /B m .…”

Section: ) Approximation For Minor Hysteresis Lossmentioning

confidence: 99%

Harmonic Loss and Torque Analysis of High-Speed Induction Motors

Yamazaki

Suzuki

Ohto

et al. 2012

IEEE Trans. on Ind. Applicat.

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In this paper, we investigate the harmonic losses and torque of high-speed induction motors from both results of measurements and calculations. The calculation method of harmonic core losses and torque has been developed from the viewpoint of practical and useful application to rotating machines. This method is based on the combination of 2-D and 1-D finite-element methods with approximated core loss modeling, which requires only few material constants obtained by Epstein frame tests. The frequency and the flux density dependence of the core loss are modeled by the 1-D analysis along the thickness direction of electrical steel sheets. Furthermore, the proposed method can decompose the total loss and torque into harmonic components because of its simple modeling. This decomposition reveals the main loss factors and the decrease in the torque of the high-speed induction motors due to the harmonic core losses. The validity of the calculation is confirmed by measurements. In addition, useful information for the design of high-speed induction motors is obtained by using the proposed method.

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Section: ) Approximation For Minor Hysteresis Lossmentioning

confidence: 99%

Harmonic Loss and Torque Analysis of High-Speed Induction Motors

Yamazaki

Suzuki

Ohto

et al. 2012

IEEE Trans. on Ind. Applicat.

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“…(b) Stator and rotor slot harmonics: The stator slot harmonics appear at the rotor. The space-harmonic order k is determined by the number of slots, whereas n is 1 [4]. Similarly, the rotor slot harmonics appear at the stator.…”

Section: A Analyzed Motor and Femmentioning

confidence: 99%

“…The torque produced by the harmonic rotational field, whose space-and time-harmonic orders are k and n, can be calculated as follows [4]:…”

Section: E Torque Calculation Considering Harmonicsmentioning

confidence: 99%

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A novel equivalent circuit involving stray load loss and harmonic torques for high speed induction motors driven by inverters

Yamazaki

Suzuki

Ohto

et al. 2011

2011 IEEE International Electric Machines &Amp; Drives Conference (IEMDC)

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The circuit parameters involving the stray load loss and harmonic torques of high speed induction motors driven by inverters are determined by both finite element analysis and experiments. In the analysis, the parameters are directly determined from the electromagnetic field distribution of the motors under load conditions. On the other hand, in the experiment, the parameters are determined from no-load, locked rotor, and load tests. The characteristics calculated by the proposed circuits are compared with those of the measurement in order to clarify the validity and usefulness of the proposed circuit. It is clarified that the accuracy of the calculated characteristics is significantly improved by the proposed circuit as compared to the conventional circuit, particularly at high speed conditions.

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“…For the distributed winding, 3 rd and 5 th order harmonic can be eliminated by means of short-pitch winding [4] or properly varying skew angle [5].…”

Section: Control the Harmonic Of Induction Motormentioning

confidence: 99%

A Control of the MMF Space Harmonic Parasitic Torques in the concentrated winding AC Machine Using Skew angle Optimization

Rok

Yun

Jung

et al. 2006

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

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In this study, the authors proposed a method of controlling harmonic parasitic torque in concentrated winding induction motor and validated its theory's practicality through the experiment. To control harmonic, the rotor was skewed at an angle and to determine optimum skew angle, three dimensional electromagnetic analysis was performed. The result of analysis demonstrated larger than 20 degree skew angle, which was not conventional in distributed winding, was favorable in the proposed concentrated winding induction motor. In this investigation, 27 degree skew angle was optimal for the proposed designed motor. Additionally, in the case AC motor was designed per the proposed theory in this study, the proposed design can be manufactured more cost effectively than conventional distributed Winding .

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Calculation of Negative Torque Caused by Slot Ripples of Induction Motors

Cited by 18 publications

References 5 publications

Harmonic Loss and Torque Analysis of High-Speed Induction Motors

Harmonic Loss and Torque Analysis of High-Speed Induction Motors

A novel equivalent circuit involving stray load loss and harmonic torques for high speed induction motors driven by inverters

A Control of the MMF Space Harmonic Parasitic Torques in the concentrated winding AC Machine Using Skew angle Optimization

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