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Hirotsuka I.,Chubu University | Tsuboi K.,Chubu University | Kawakami M.,TOSHIBA Industrial Products Manufacturing Co.
40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011 | Year: 2011

Recently, the reduction of electromagnetic vibration and noise from three-phase squirrel-cage induction motors (IMs) has become a very important subject from the standpoint of environmental improvement. Although electromagnetic vibration of IMs has been studied for several years, the relationship between radial distribution of the electromagnetic vibration and noise, and the force wave, the cause of the vibration and noise, has yet to be analyzed in sufficient detail. In the present paper, this relationship is investigated experimentally for a small IM at the no-load condition. It is clearly shown the relationship the radial distribution of dominant electromagnetic vibration, noise components, and electromagnetic force wave occasioned the vibration and noise. Copyright © (2011) by the Institute of Noise Control Engineering. Source


Umemura T.,Mie University | Nakamura S.,Mie University | Hikita M.,Kyushu Institute of Technology | Maeda T.,Toshiba Corporation | Higashiyama M.,TOSHIBA Industrial Products Manufacturing Co.
IEEE Transactions on Dielectrics and Electrical Insulation | Year: 2013

Partial discharges of small-air-gap for the molded insulation system has been investigated in view of the Paschen curve. It was found that Vs (partial discharge inception voltage: PDIV) in a smaller Pd (pressure times gap distance) region than so-called Paschen¿s minimum was determined in terms of glow-like discharge with micro-second order of discharge-current probably due to the ionic current for both MGM (Metal-Gap-Metal) and MGI (Metal-Gap-Insulation) electrode systems. In the Paschen¿s minimum and the larger Pd regions for MGM, the partial discharge behavior showed a streamer-like discharge current waveform with relatively short rise-time of an order of 10 ns or less and short discharge-duration. For the MGI electrode system, on the other hand, the discharge type was found to show glow-like discharge with small discharge current of less than few A. The glow-like discharge, Townsend and/or streamer discharges were also recognized by the high speed CCD camera photographs. © 1994-2012 IEEE. Source


Arata M.,Toshiba Corporation | Takahashi N.,TOSHIBA Industrial Products Manufacturing Co. | Mochizuki M.,TOSHIBA Industrial Products Manufacturing Co. | Araki T.,TOSHIBA Industrial Products Manufacturing Co. | Hanai T.,TOSHIBA Industrial Products Manufacturing Co.
World Electric Vehicle Journal | Year: 2012

A Hybrid Vehicle (HEV) and an Electric Vehicle (EV) are some of solutions to improve efficiency of a cruse and to reduce CO2 gas by regenerative breaking and operating the engine in optimum condition. It is requested to decrease the motor size and to increase the maximum torque for minimizing the driving units. For these purposes permanent magnet applied motors have been commonly used recently. The motor driving systems of HEV or EV must operate at variable speed ranges of up to 1:5. For this large range, Silent and smooth operations are desirable and important. Skew method is often adopted to ensure smooth start and stop and silent operation by reducing the torque ripple. But it possibly causes noise and vibration of the motor. This paper describes the mechanism of torsional resonance noise and vibrations arising from the skew method and the countermeasure to decrease them. © 2012 WEVA. Source


Arata M.,Toshiba Corporation | Mochizuki M.,TOSHIBA Industrial Products Manufacturing Co. | Araki T.,TOSHIBA Industrial Products Manufacturing Co. | Hanai T.,TOSHIBA Industrial Products Manufacturing Co. | Matsubara M.,TOSHIBA Industrial Products Manufacturing Co.
IEEJ Transactions on Industry Applications | Year: 2013

A hybrid electric vehicle (HEV) is one of the solutions to improve the efficiency of a drive and to reduce CO2 emissions. It is desirable to decrease the motor size and to increase the maximum torque to minimize the size of the driving units. For these purposes, motors employing permanent magnet have been commonly used recently. Depending on the electrical output up-rating of an HEV motor, parallel circuit will be employed in the armature circuit. However, this could possibly cause noise and vibration in the motor because the motor driving systems of HEVs or electric vehicles (EVs) must operate over large variable speed ranges of up to 1 : 5. The authors analyzed the features of the noise patterns and identified the main cause. Mock-up tests were conducted to confirm the main cause, and the countermeasures including a winding scheme change, were determined. This paper describes the mechanism of sub-harmonics frequency noise and vibrations arising from rotor eccentric motion and currents in parallel circuits and a method to decrease them. © 2013 The Institute of Electrical Engineers of Japan. Source


Arata M.,Toshiba Corporation | Takahashi N.,Toshiba Corporation | Mochizuki M.,Toshiba Corporation | Araki T.,TOSHIBA Industrial Products Manufacturing Co. | Hanai T.,TOSHIBA Industrial Products Manufacturing Co.
26th Electric Vehicle Symposium 2012, EVS 2012 | Year: 2012

A Hybrid Vehicle (HEV) and an Electric Vehicle (EV) are some of solutions to improve efficiency of a cruse and to reduce CO2 gas by regenerative breaking and operating the engine in optimum condition. It is requested to decrease the motor size and to increase the maximum torque for minimizing the driving units. For these purposes permanent magnet applied motors have been commonly used recently. The motor driving systems of HEV or EV must operate at variable speed ranges of up to 1:5. For this large range, Silent and smooth operations are desirable and important. Skew method is often adopted to ensure smooth start and stop and silent operation by reducing the torque ripple. But it possibly causes noise and vibration of the motor. This paper describes the mechanism of torsional resonance noise and vibrations arising from the skew method and the countermeasure to decrease them. Source

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