Improved efficiency test methods for three-phase induction machines

McKinnon, D.J.; Grantham, C.

doi:10.1109/ias.2005.1518349

Cited by 8 publications

(9 citation statements)

References 19 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The currents, the different losses and so the efficiency are calculated for all the machines as recommended by the standard IEC-60034-2 [17,18]. The parameters of the single-phase equivalent scheme are separately determined by practical classic tests (no-load, blocked rotor.…”

Section: Characteristics With Loadmentioning

confidence: 99%

Non-Segmented Grain Oriented Steel in Induction Machines

Cassoret¹,

Lopez²,

Brudny³

et al. 2014

PIER C

View full text Add to dashboard Cite

Abstract-This paper presents a technique which improves energy efficiency of AC rotating machines by using Grain Oriented (GO) steel at stator core instead of Non Oriented (NO) steel. The losses of GO steel are lower than the NO ones, but only when the magnetic flux circulates along the rolling direction; consequently it is rarely used in AC machines where the magnetic flux rotates. By stacking many shifted GO laminations of AC machine stator, the flux pass from one lamination to another, and the core losses are reduced. A lot of experimentations have been done with unidirectional field, rotating field and with real induction machines. They show important improvements with GO shifted steel. The efficiency difference between a classical 10 kW induction machine and a modified machine with GO stator is more than 2 points. Moreover, the no-load current, and so the reactive power are smaller. This technique creates environmental and financial gains.

show abstract

Section: Characteristics With Loadmentioning

confidence: 99%

Non-Segmented Grain Oriented Steel in Induction Machines

Cassoret¹,

Lopez²,

Brudny³

et al. 2014

PIER C

View full text Add to dashboard Cite

show abstract

“…The current method used to carry out efficiency test is to connect a rated load to the test machine shaft. This is difficult, particularly for linear machines and large vertical machines [9]. Furthermore, this method requires removal of the test machine from the set, if postinstallation tests are required, leading to loss of production.…”

Section: Introductionmentioning

confidence: 97%

“…Synthetic loading can do this without connecting a mechanical load to the machine drive shaft [9]. With synthetic loading, the electrical machine is accelerated and decelerated in a controlled manner to alternate rapidly between motor-generator action, producing rated rms current and on average, rated speed.…”

Section: Introductionmentioning

confidence: 99%

Efficiency evaluation of linear permanent magnet synchronous machines using the synthetic loading method

Abbas

Fletcher

2008

2008 IEEE Power Electronics Specialists Conference

View full text Add to dashboard Cite

In this paper, the concept of efficiency evaluation of linear permanent magnet synchronous motors using the synthetic loading method is described and evaluated. Synthetic loading is a method of efficiency evaluation that eliminates the need for a mechanical load to absorb generated shaft power. A mathematical model for synthetic loading is derived for the linear machine using the d-q machine model that includes core loss. The implication of synthetic loading frequency on the required inverter DC link voltage and inverter volt-ampere rating is discussed. In addition, the effect of additional mover mass on the synthetic loading frequency is described in order to get constant swing velocity. Synthetic loading and standard efficiency tests, as methods of efficiency evaluation, are simulated using MATLAB and SIMULINK. Simulation data is verified through the experiment for synthetic loading and the standard efficiency tests. Simulation and experimental results show that the synthetic loading method is capable of evaluating the efficiency of linear permanent magnet synchronous motor under test.

show abstract

“…In 1921 Ytterberg introduced the two-frequency or mixedfrequency synthetic loading method for insulation temperature rise tests on induction machines. This method develops the equivalent of a full-load test but is achieved without mechanically loading the induction machine [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…The conventional method used to carry out efficiency tests is to connect a rated load to the test machine shaft. This is difficult, particularly for linear machines and large vertical machines [12]. Furthermore, the method requires removal of the test machine from the system, if post-installation tests are required, leading to loss of production.…”

Section: Introductionmentioning

confidence: 99%

Synthetic loading applied to linear permanent magnet synchronous machines

Abbas

Fletcher

2010

IET Renew. Power Gener.

View full text Add to dashboard Cite

Linear permanent magnet (PM) machines are applicable to a number of prototype renewable energy devices and therefore are candidates for deployment. Synthetic loading for efficiency evaluation of linear PM synchronous machines is described and evaluated. Synthetic loading is a technique that eliminates the need for an external mechanical load to absorb generated shaft power during rated load efficiency tests. As such it is a technique ideally suited to the large linear PM generators proposed for renewable applications. Mathematical expressions for synthetic loading are derived for the linear PM synchronous machine using the dq machine model that includes core loss. Synthetic loading and standard efficiency tests, as methods of efficiency evaluation, are simulated using MATLAB and SIMULINK. Simulation data are verified by experiment for both the synthetic loading test and the standard efficiency test. Simulation and experimental results show that the synthetic loading method is capable of evaluating the efficiency of linear PM synchronous machine under test. The results show good agreement with standard efficiency tests. The key contribution of this work includes the mathematical expressions of synthetic loading applied to linear PM synchronous machines, the hardware and software implementation of the technique and the validation of the synthetic loading as a technique for efficiency evaluation of linear PM synchronous machines

show abstract

Improved efficiency test methods for three-phase induction machines

Cited by 8 publications

References 19 publications

Non-Segmented Grain Oriented Steel in Induction Machines

Non-Segmented Grain Oriented Steel in Induction Machines

Efficiency evaluation of linear permanent magnet synchronous machines using the synthetic loading method

Synthetic loading applied to linear permanent magnet synchronous machines

Contact Info

Product

Resources

About