Slot-Harmonic Fields in Closed-Slot Machines

Williamson, S.; Feng, Yue

doi:10.1109/tia.2008.926224

Cited by 22 publications

(5 citation statements)

References 2 publications

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“…The magnetic pressure B 2 g /(2µ0) is first decomposed in 2D Fourier series to obtain a set of sinusoidal force waves of complex magnitude P mω , spatial order m and pulsation ω (see Fig. 3).…”

Section: B Vibro-acoustic Modelmentioning

confidence: 99%

“…I shows the vibration level recorded on an accelerometer sensor placed on the frame of a laboratory 700 W squirrelcage motor at two different speeds: the vibration level, which is mainly due to magnetic forces at frequencies greater than 500 Hz, strongly depends on the stator fundamental frequency f s as a 30 dB increase is observed near 2400 Hz from f s = 40 Hz to 75 Hz. Indeed the distribution of magnetic forces along the air-gap can be represented by an infinite set of rotating force waves (harmonics [2] coming from the 2D Fourier transform of Maxwell radial forces) that can excite the stator structure natural frequencies [3]. As the speed of these traveling force waves is proportional to the stator fundamental frequency, some resonances can appear according to the motor speed value and its stator circumferential modes natural frequencies [4].…”

Section: Introductionmentioning

confidence: 99%

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Prediction of audible magnetic noise radiated by adjustable speed drive induction machines

Besnerais

Lanfranchi

Friedrich

et al. 2009

2009 IEEE International Electric Machines and Drives Conference

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This paper presents a fully analytical model of the electromagnetic and vibro-acoustic behavior of variable-speed squirrel-cage induction machines. This model is integrated in a fast simulation tool that can be used to design motors with low magnetic noise level on their whole speed range. Some simulation results at variable speed are favorably compared with experiments at both vibratory (spectrograms) and acoustic levels (sonagrams) on a 700 W laboratory motor and on an industrial 250 kW traction motor. These extensive tests show that the model correctly predicts the main exciting forces, motor natural frequencies and resonances during adjustable-speed drive. The simulation tool, called DIVA, has been successfully applied to design a new low-noise ALSTOM motor.

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Section: B Vibro-acoustic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction of audible magnetic noise radiated by adjustable speed drive induction machines

Besnerais

Lanfranchi

Friedrich

et al. 2009

2009 IEEE International Electric Machines and Drives Conference

View full text Add to dashboard Cite

show abstract

“…Like the model reference adaptive control method, when rotor slots harmonic (RSH) theory is used to identify temperature, which is difficult to measure directly, it is necessary to improve the calculation efficiency and identification accuracy of the RSH [1]- [4]. Research shows that it is of great significance to set a temperature protection limit and to increase the response speed of overheating failure protection for an induction motor [5], [6].…”

Section: Introductionmentioning

confidence: 99%

An Approach for Identifying the Temperature of Inductance Motors by Estimating the Rotor Slot Harmonic Based on Model Predictive Control

Wang¹,

Jiang²,

Zhang³

et al. 2017

Journal of Power Electronics

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In order to satisfy the urgent requirements for the overheating protection of induction motors, an approach that can be used to identify motor temperature has been proposed based on the rotor slots harmonic (RSH) in this paper. One method to accomplish this is to improve the calculation efficiency of the RSH by predicting the stator winding distribution harmonic order by analyzing the harmonics spectrum. Another approach is to increase the identification accuracy of the RSH by suppressing the influence of voltage flashes or current surges during temperature estimation based on model predictive control (MPC). First, an analytical expression of the stator inductance is extracted from a steady-state positive sequence motor equivalent circuit model developed from the rotor flux field orientation. Then a procedure that applies MPC for reducing the identification error of the rotor temperature caused by voltage sag or swell of the power system is given. Due to this work, the efficiency and accuracy of the RSH have been significantly improved and validated our experiments. This work can serves as a reference for the on-line temperature monitoring and overheating protection of an induction motor.

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“…In other work, spectral analysis of machine parameters were considered for fault diagnosis based on FEM analysis by . Moreover, closed-slot effect has been studied on the electrical machines harmonics by Williamson and Feng (2008) and the stator current signatures were studied for cage-rotor induction machines (CRIM) in Joksimovic et al (2013). The stator current signature is a well-known tool which are…”

Section: Introductionmentioning

confidence: 99%

Inter-turn short-circuit fault detection in saturable squirrel-cage induction motor using magnetic equivalent circuit model

Naderi

2016

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose – The purpose of this paper is to obtain an integrated method for inter-turn short circuit fault detection for the cage-rotor induction machine (CRIM) considering saturation effect. Design/methodology/approach – The magnetic equivalent circuit (MEC) is proposed for machine modeling and nonlinear B-H curve is considered for saturation effect. The machine has some differential equations which are converted to algebraic type by trapezoidal method. On the other hand, some nonlinear equations are present due to saturation effect. A set of nonlinear algebraic equation should be solved by numerical method. Therefore, the Newton-Raphson technique is used for equation solving during of the considered time step. Findings – Generally, the operating point of electrical machines is close to the saturation zone due to designing considerations. Moreover, some current and torque harmonics will be produced due to time and space harmonics combination, which cannot be studied when saturation modeling is neglected. Considering both space and time harmonics, a method is proposed for inter-turn short circuit fault detection based on the stator current signatures and the machine performance is analyzed in healthy and faulty cases. In order to obtain the integrated method, two sample machines (two and also four-pole machines) are modeled and finally the accuracy of the proposed method is verified through the experimental results. Research limitations/implications – The calculations have been done in this work is limited to CRIM considering. However, the presented modeling method can be used for another types of electrical machines by some minor modifications. Originality/value – Obtaining of an integrated formula for the inter-turn short circuit fault detection which has been presented for first time is the more advantages of present work. Moreover, in order to saturation effect considering, a new method is presented for solving of nonlinear equations which is another novelty of paper.

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Slot-Harmonic Fields in Closed-Slot Machines

Cited by 22 publications

References 2 publications

Prediction of audible magnetic noise radiated by adjustable speed drive induction machines

Prediction of audible magnetic noise radiated by adjustable speed drive induction machines

An Approach for Identifying the Temperature of Inductance Motors by Estimating the Rotor Slot Harmonic Based on Model Predictive Control

Inter-turn short-circuit fault detection in saturable squirrel-cage induction motor using magnetic equivalent circuit model

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