Determining total losses and temperature rise in induction motors using equivalent loading methods

Mihalcea, Aurelia; Szabados, B.; Hoolboom, J.

doi:10.1109/60.937199

Cited by 26 publications

(17 citation statements)

References 4 publications

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“…Computer simulation results obtained show that for the same induction motor, the ratings of PWM inverter used in this paper compared to one used in Reference [9], are much lower. …”

Section: Discussionmentioning

confidence: 79%

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Equivalent loading of induction motors using a new composite power supply with a linear (U/Hz) characteristic

Soltani

Szabados

Hajian

2006

Euro. Trans. Electr. Power

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SUMMARYThis paper describes a mixed variable voltage magnitude variable frequency (VVMVF) power supply with linear U/Hz characteristic that can be used for equivalent loading of ac machines. The proposed voltage source ensures the rated air gap flux as well as forces the rated current (I rms ) inside the test machine without the need to connect a mechanical load to the shaft. This means that the motor total losses essentially will be the same as under normal full load operation. A comparison is first made between those of equivalent loading schemes of induction machine that use the frequency and magnitude modulating voltage sources. Then the practical implementation of a 1.5 kW voltage source of the above mentioned type is presented which is achieved by series connection of a regular constant voltage and frequency source (the motor-rated source) and a special PWM inverter (auxiliary source), using an isolating transformer. The mixed single-phase source is used for synthetic loading of a capacitor start single-phase induction motor. Simulation and experimental results obtained are in close agreement.

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“…Computer simulation results obtained show that for the same induction motor, the ratings of PWM inverter used in this paper compared to one used in Reference [9], are much lower. …”

Section: Discussionmentioning

confidence: 79%

“…In References [6] and [9] have been shown that the auxiliary power source voltage should be about 30% of the main power source voltage. As a result the resultant voltage magnitude will vary between 130% and 70% of the rated main power source voltage.…”

Section: Comparison Of Equivalent Loading Schemesmentioning

confidence: 99%

Equivalent loading of induction motors using a new composite power supply with a linear (U/Hz) characteristic

Soltani

Szabados

Hajian

2006

Euro. Trans. Electr. Power

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“…Constant speed method [11] is based only on the variation of the voltage amplitude, the speed is kept constant. In this method the dc-link shall be designed for a voltage higher than the rated one in order to insure a flux magnitude oscillating around the rated flux value.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, the power supply limitations becoming less obvious, several methods have been developed while others updated [10][11]. Despite this fact, other drawbacks arose.…”

Section: Introductionmentioning

confidence: 99%

Static Torque Method to Estimate Temperature Rise in High Power Induction Motors

Lateb¹,

Mercier²,

Mirzaian³

et al. 2009

2009 IEEE Industry Applications Society Annual Meeting

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Because of limitations imposed by manufacturer's power supplies and load equipment, factory acceptance test, that is, conventional temperature rise tests are extremely difficult and expensive to perform for large output machines. In those cases alternative methods to estimate the temperature rise and full load losses are considered. In this paper we propose a simple alternative method called "static torque method" suitable for high power induction motors' application such as ship propulsion and which most manufacturers could employ with a minimum capital expenditure. The principle of the method is discussed and temperature rise results from 3 sizes of induction machines are compared with those obtained through conventional full load test. The difference between the results obtained by static method and full load method doesn't exceed 5%.

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“…Other researchers have since carried out analysis of the Dual-Frequency method [9], [12], [13]. The power electronic methods produce slightly higher temperature rises than does the conventional full-load test.…”

Section: Synthetic Loadingmentioning

confidence: 98%

Improved efficiency test methods for three-phase induction machines

McKinnon

Grantham

Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005.

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The results in this paper demonstrate that the synthetic loading methods described are able to be used to evaluate the efficiency of three-phase induction machines. Synthetic loading causes the machine, as it is rotating, to periodically accelerate and decelerate. This causes the machine to draw, on average, rated current, at rated voltage at or near rated speed, thus producing rated losses. The total losses for efficiency evaluation are identified by taking the average of the measured input power over each synthetic loading cycle. The measured results give excellent agreement with the conventional full-load efficiency test method. The synthetic loading test methods are portable with no loss of accuracy, so they are suitable for either on-site or laboratory use. The test is easy to set up, requiring only that the motor be decoupled from the load and electrically connected to an inverter controlled from a PC that also displays the results in real time. The efficiency evaluation method proposed is accurate, easy to use and considerably reduces the testing time compared with conventional methods, hence reducing testing costs.

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Determining total losses and temperature rise in induction motors using equivalent loading methods

Cited by 26 publications

References 4 publications

Equivalent loading of induction motors using a new composite power supply with a linear (U/Hz) characteristic

Equivalent loading of induction motors using a new composite power supply with a linear (U/Hz) characteristic

Static Torque Method to Estimate Temperature Rise in High Power Induction Motors

Improved efficiency test methods for three-phase induction machines

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