Advances in Construction Techniques of AC Induction Motors: Preparation for Super-Premium Efficiency Levels

Malinowski, John; McCormick, J.; Dunn, Kameron

doi:10.1109/tia.2004.836300

Cited by 55 publications

(16 citation statements)

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“…Finally, the slot geometry used is shown in Figure A. This is of semiclosed trapezoidal shape and is most commonly used in contrast with the open type, as its use limits the magnetization current and reduces vibrations at teeth, and thus, a quieter operation can be achieved . On the basis of typical commercial values for some parameters as shown in Table in the Appendix, the geometry of the stator can be completed using the rest of classical design theory, eg, Upadhyay…”

Section: Primary Design Phase Of Spimmentioning

confidence: 99%

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Design and manufacturing of a single-phase induction motor: A decision aid tool approach

Karnavas

Chasiotis

2017

Int Trans Electr Energ Syst

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Summary This paper presents a simple, practical, and effective design, analysis, and selection approach of a capacitor‐run single phase induction motor as a manufacturing aid tool at the early stage of the design. The standard industrial motor frame sizes as well as the current design trends of larger lengths and smaller diameters—which are not likely presented in literature—are taken into account. At first, to verify the proposed approach, a sample single phase induction motor design is obtained regarding certain requirements, based mainly on the classic output coefficient concept. Then, numerous simulations over a large number of candidate motor topologies are conducted. This series of investigations is performed initially with respect to (1) certain operational industrial criteria, (2) the number of stator and rotor slots, and (3) the rotor cage material. After the relevant results are presented and commented, a selection strategy of an appropriate design is also proposed. Also, the effect of the running capacitor value is examined. It is seen that the total design and selection procedure are verified very satisfactorily. Finally, useful conclusions from a manufacturer's point of view are also extracted, dealing with important operational characteristics of the motor, such as power factor, winding currents phase shift, total losses, starting/rated torque ratio, efficiency, and other.

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Section: Primary Design Phase Of Spimmentioning

confidence: 99%

“…IEEE 841 and even NEMA premium efficiency levels are now a challenge to meet and exceed. For example, new research and production techniques allow construction of SPIMs with die‐cast copper rotors, allowing for even higher efficiency levels and greater longevity …”

Section: Introductionmentioning

confidence: 99%

Design and manufacturing of a single-phase induction motor: A decision aid tool approach

Karnavas

Chasiotis

2017

Int Trans Electr Energ Syst

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“…Mainly the Fe-based glasses are the candidates for this purpose, due to their favorable soft magnetic properties, as well as the advanced production technology of rapid quenching. (Malinowski et al, 2004;Singh et al, 1992). Despite all these benefits, several additional issues, such as the shaping (cutting) of the tapes to the desired form, have to be solved.…”

Section: Introductionmentioning

confidence: 99%

The impact of composition dependent and process-related properties in the laser cutting of metallic glassy tapes

Szabó

Lovas

2019

Production Engineering Archives

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A short survey is reported on the advantageous and disadvantageous properties of soft magnetic glassy tapes to build stator and rotor elements for the increase of motor efficiency. The relative high saturation magnetization and the relative permeability of these alloy groups seem to be promising in this application field. On the other hand, the sample thickness (30 µm) displays limitations in terms of a filling factor. High hardness of tapes hinders the effectivity of mechanical shaping. Laser cutting can be successful as shaping method, presuming that the extension (thickness) of heat affected zone (HAZ) can be successfully reduced below 50µm, avoiding the brittleness evolution.

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“…The higher efficiency can usually be achieved by increasing the active materials, such as increasing the stack length [5,6], in induction motors. Another measure of upgrading materials such as premium electrical grade lamination steel is used for decreasing core losses and Ohmic losses [6][7][8].The efficiency can also be improved by enhancing the performance of cooling and bearing systems to reduce the mechanical losses [7] and improving cooling performance to make Ohmic losses less significant [9]. These methods either rise the raw material cost or increase manufacturing complexity.…”

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confidence: 99%

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confidence: 99%

A Hybrid Methodology for Analyzing the Performance of Induction Motors with Efficiency Improvement by Specific Commercial Measures

Lee

Kirtley

et al. 2019

Energies

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This paper presents a hybrid methodology to analyze the commercial measures of changing stator windings and adjusting air gap length to upgrade efficiency of typical three-phase direct-on-line induction motors with die-cast copper rotor (DCR). The calculation is carried out through combining the time-stepping and time-harmonic finite element analysis (FEA) and the circuit equivalent circuit model. Typical full-load performance of stator windings with different air gap lengths are computed by MATLAB invoking the 2D transient and eddy current field analysis in ANSYS/MAXWELL. Then, MATLAB scripts about post-processing of the FEA results are used to obtain the full-load running performance including the loss distribution and circulating current. The MATLAB scripts of circuit model built based on the FEA results is used to compare the overload and starting performance. After that, four stators with the four windings and three DCRs with different air gap of an 11 kW motor are fabricated and tested to validate the calculations. By comparing results from both calculations and measurements, it is shown that the factors of stator windings and air gap length can effectively improve the efficiency of the 11 kW DCR induction motor without the addition of extra materials. The motor with the 11/12 pitch Y-∆ series winding and 0.6 mm air gap has the best performance, in terms of efficiency, overloading capability and starting performance. Its efficiency can increase from 90% to the highest 92.35% by sole adjustment of stator winding and air gap length.Many technical measures have been investigated for improving the efficiency of induction motors. The higher efficiency can usually be achieved by increasing the active materials, such as increasing the stack length [5,6], in induction motors. Another measure of upgrading materials such as premium electrical grade lamination steel is used for decreasing core losses and Ohmic losses [6][7][8].The efficiency can also be improved by enhancing the performance of cooling and bearing systems to reduce the mechanical losses [7] and improving cooling performance to make Ohmic losses less significant [9]. These methods either rise the raw material cost or increase manufacturing complexity. Although geometry optimization techniques [10][11][12][13][14][15][16] can be used to increase the efficiency of induction motors without increasing the active materials, this technique ends up producing a different design from the original one. Consequently, a new stator and rotor punching mold is required and additional cost results. It can be seen that in practice these measures can only be used to design a new motor, therefore many manufacturers have paid more attention to ways of increasing the efficiency of their induction motors with the least cost. That means the techniques should change construction or parameters of the existing motors as little as possible. Die-cast copper rotor (DCR) technology that involves the development of heated nickel-base alloy dies presents a potential route to design hi...

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Advances in Construction Techniques of AC Induction Motors: Preparation for Super-Premium Efficiency Levels

Cited by 55 publications

References 0 publications

Design and manufacturing of a single-phase induction motor: A decision aid tool approach

Design and manufacturing of a single-phase induction motor: A decision aid tool approach

The impact of composition dependent and process-related properties in the laser cutting of metallic glassy tapes

A Hybrid Methodology for Analyzing the Performance of Induction Motors with Efficiency Improvement by Specific Commercial Measures

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