Temperature field of a double squirrel-cage motor during startup

Mróz, J.

doi:10.1049/ip-epa:20045219

Cited by 21 publications

(14 citation statements)

References 2 publications

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“…1) [7]. Therefore, it is not uncommon for the outer bar temperature to exceed 200 o C, and the thermomechanical stresses combined with rotational forces, vibration, and residual stresses, make the outer cage of double cage rotors vulnerable to fatigue failure [8]. If broken outer bars are left undetected/unrepaired, they can vibrate in the slot, and the inter-bar current from the broken bars to the adjacent bars can damage the laminations due to arcing [5], [9]- [10].…”

Section: Introductionmentioning

confidence: 99%

“…A photograph of a double cage rotor with contiguous broken outer cage bars is shown in Fig. 2 [8]. This motor was used for driving a gangway conveyor for coal-mining, and the problem with the rotor was discovered because the motor failed to start.…”

Section: Introductionmentioning

confidence: 99%

“…Many on-line and off-line techniques for detecting broken bars have been developed and used in the field over a long period of time [5], and recently, there has been lot of research that failed to start due to broken outer cage bars [8] effort in academia on the analysis and development of advanced broken bar detection algorithms [11]- [12]. However, most of the work focus on the analysis and detection of single cage rotor failures, and only a few publications in the literature investigate broken bar detection for double cage rotors [9]- [10], [13].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the detectability of broken rotor bars for double squirrel cage rotor induction motors

Park

Kim

Yang

et al. 2010

2010 IEEE Energy Conversion Congress and Exposition

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Double squirrel cage rotor design is employed in induction motor applications that require high starting torque and high efficiency operation. The outer cage of double cage rotors is vulnerable to fatigue failure since it must withstand the large thermal/mechanical stresses experienced during a loaded startup due to the high starting current and long acceleration time. However, there are only a few publications that investigate broken bar detection for double cage induction motors. In this paper, the detectability of broken outer cage bars in double cage motors for the most commonly used rotor bar test methods is evaluated. A finite element and experimental study show that the sensitivity of on-line MCSA is significantly decreased, whereas that of off-line standstill tests is not influenced for broken outer cage bars. This suggests that one should be aware of the insensitivity of MCSA for double cage rotors, and there is a need for development of new on-line monitoring methods.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the detectability of broken rotor bars for double squirrel cage rotor induction motors

Park

Kim

Yang

et al. 2010

2010 IEEE Energy Conversion Congress and Exposition

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“…As a result, the temperature rise of the contact couple will significant rise in the running process. The accumulated heat affects the normal work of the motor, especially damages the internal structure of the motor [1,2]. In recent years, a large number of scholars have studied and analyzed effect of the temperature field on performances of the motor [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Temperature Field of Motor Coil and Carbon Brush Couple

Ding¹,

Zhou²,

Luo³

2017

dtcse

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Abstract. The RS775 DC motor was chosen to analyze its performance of temperature field by finite element analysis software of ANSYS workbench. The result indicates that the temperature of carbon brush and the coil rises sharply in the process of the motor coil sliding against carbon brush when the machine works in rated voltage. The main cause of the motor damage is the abrasion wear and oxidative wear due to temperature rise of contact couple. Moreover, the temperature rise of carbon brush is higher than that of the coil. The carbon brush of motor is the most vulnerable parts. The replacing carbon brush and regular maintenance should be applied to reduce the wear due to high temperature in order to extend the service life of the motor.

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“…Double cage rotors are characterized by its large outer (starting) bar resistance and large inner (running) bar leakage inductance. Since double cage motors are used for loaded startups, the outer cage must handle the large starting current for the long acceleration time, with limited path for heat dissipation [3].…”

Section: Introductionmentioning

confidence: 99%

Quantitative rotor broken bar evaluation in double squirrel cage induction machines under dynamic operating conditions

Gritli

Tommaso

Miceli

et al. 2013

2013 Eighth International Conference and Exhibition on Ecological Vehicles and Renewable Energies (EVER)

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Advanced monitoring techniques leading to fault diagnosis and prediction of induction machine faults, operating under non-stationary conditions have gained strength because of its considerable influence on the operational continuation of many industrial processes. In case of rotor broken bars, fault detection based on sideband components issued from currents, flux, instantaneous control or power signals under different load conditions, may fail due to the presence of inter-bar currents that reduce the degree of rotor asymmetry, especially for double squirrel cage induction motors. But the produced core vibrations in the axial direction, can be investigated to overcome the limitation of the classical technique using appropriate timefrequency analysis for these purposes. Unlike previous approaches, the presented technique is based on optimized use of the Discrete wavelet transform to overcome the limitation of classical frequency approaches under non-stationary operating conditions. The developed approach is best suited for automotive or high power traction systems, in which safe-operating and availability are mandatory. Experimental results are provided, showing the validity of the investigated technique, leading to an effective diagnosis procedure for incipient rotor broken bars in double or single cage induction machines under dynamic operating conditions.

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Temperature field of a double squirrel-cage motor during startup

Cited by 21 publications

References 2 publications

Evaluation of the detectability of broken rotor bars for double squirrel cage rotor induction motors

Evaluation of the detectability of broken rotor bars for double squirrel cage rotor induction motors

Finite Element Analysis of Temperature Field of Motor Coil and Carbon Brush Couple

Quantitative rotor broken bar evaluation in double squirrel cage induction machines under dynamic operating conditions

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