Generalized MMF space harmonics and performance analysis of combined multiple-step, star-delta, three-phase windings applied on induction motors

Cistelecan, Mihai V.; Ferreira, Fernando J. T. E.; Cosan, H. Baris

doi:10.1109/icelmach.2008.4799917

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…In this respect, using some control strategies [8], the iron losses could get lower and the motor efficiency can be significantly increased in the low-load operation periods. The motor efficiency, power factor, line current, and stator winding average temperature as a function of the load, as well as the torque-slip curve are shown in Figs.…”

Section: Experimental Validationmentioning

confidence: 99%

“…Moreover, when properly managed as a function of the motor load (as explained in [7]), the average windings temperature rise for the lower flux connections is lower than that for the full-load operation with full-delta connection. In order to define the most appropriate rated loads for each step of winding connections, some strategies have been described in [8]. However, taking into account the constant slip strategy and the torque-slip steady-state dependence in Fig.…”

Section: Experimental Validationmentioning

confidence: 99%

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Adjustable Flux Three-Phase AC Machines With Combined Multiple-Step Star-Delta Winding Connections

Cistelecan

Ferreira

Popescu

2010

IEEE Trans. Energy Convers.

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In this paper, a complete theory and analysis method for combined star-delta three-phase windings from the point of view of magnetomotive force spatial harmonics content and equivalent winding factors calculation is developed. The method allows for any spatial angle and any coils percentage distribution between star and delta balanced winding systems. It is proven that connecting the inner delta in the clockwise or counterclockwise direction leads to two different space angles between the star and delta systems and two different steps in the flux level control. It means that, compared to what is known and applied up to now, using n winding sections in each phase, it is possible to obtain 2n steps (instead of n + 1) in the flux level. To check the analysis validity, two experimental tests are reported on both squirrel-cage, integer-winding, induction motor, and permanent magnet, low-speed, fractionalwinding, synchronous generator with a specially designed stator winding, allowing multiple-step air-gap flux regulation.

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Section: Experimental Validationmentioning

confidence: 99%

Section: Experimental Validationmentioning

confidence: 99%

Adjustable Flux Three-Phase AC Machines With Combined Multiple-Step Star-Delta Winding Connections

Cistelecan

Ferreira

Popescu

2010

IEEE Trans. Energy Convers.

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“…breakdown torques for the connections 3 and 6 are 2.04 (54 Nm) and 1.06 (28 Nm), in close agreement with the values of (k δ ) 2 For the induction motors running in partial cyclic loads [2] it is possible to adjust the air gap flux density according to the load, using a special designed connection equipment for stardelta winding. In this respect, using some control strategy [8] the iron losses could get lower and the efficiency of the drive should be increased.…”

Section: Magnetomotive Force Analysis For Combined Star-delta Winmentioning

confidence: 98%

Adjustable flux three phase a.c. machines with combined multiple-step star-delta winding connections

Cistelecan¹,

Ferreira

Popescu³

2009

2009 IEEE International Electric Machines and Drives Conference

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In the paper it is developed a complete theory and analysis method of combined star-delta three-phase windings from the point of view of MMF spatial harmonics content and equivalent winding factors calculation. The method allows for any space angle and coils percentage distribution between the star and delta balanced winding systems. It is proven that connecting the inner delta in the CW or CCW direction leads to two different space angle between the star and delta systems and two different steps in the flux level control. It means that, compared to what is known and applied up to now, using n winding sections in each phase, it is possible to obtain 2n steps (instead of n+1) in the flux level. To check the analysis validity, two experimental tests are reported on both squirrel cage integer winding induction motor and PM low speed fractional synchronous generator with a specially designed stator winding, allowing multiple-step air-gap flux regulation.

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“…The concept of the star-delta winding is similar to the use of multiphase windings, whichcould reduce phase-band harmonics by increasing the phase number [22] . However, the air-gap MMF of the two parts might be unbalanced [23][24] . Another side effect is the additional harmonic content of the air-gap magnetic field, which might be generated due to the influence of the rotor magnetic flux on the stator magnetic field [25] .…”

Section: Introduction1mentioning

confidence: 99%

Analysis of vibration and noise of induction motor equipped with concentric single-double-layer star-delta winding

Bao

2019

Chin. J. Electr. Eng.

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Compared with changing the structure of a motor that has been manufactured, changing the type of stator winding is an economical and time-saving method to reduce the vibration and noise. Thus, a concentric single-double-layer star-delta (CSDLSD) winding for an induction motor is described in this paper with the aim of reducing the noise of the motor. By planning the turns relationship between the two parts of the winding, the harmonic component of the air-gap magnetic field can be decreased. Besides this, through adjusting the turns ratio in each slot of concentric winding per phase respectively, the waveform of the air-gap magnetic field becomes closer to a sinusoidal type. Three motors equipped with the CSDLSD winding and another two types of stator winding were analyzed. The theoretical analysis and the two-dimensional finite element method (2D-FEM) were combined to study the relationship between the harmonics of the air-gap magnetic field and the stator winding. Finally, a 2D fast Fourier transformation (2D-FFT) method was used to obtain the time-frequency spectrum of the air-gap flux density and electromagnetic excitation force, and compared with a natural vibration wave. The noise distribution was obtained using the harmonic response. The results of the theoretical analysis, 2D-FEM, 2D-FFT, and harmonic response corroborate each other such that the motor applying CSDLSD winding could reduce both the vibration and noise.

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Generalized MMF space harmonics and performance analysis of combined multiple-step, star-delta, three-phase windings applied on induction motors

Cited by 11 publications

References 5 publications

Adjustable Flux Three-Phase AC Machines With Combined Multiple-Step Star-Delta Winding Connections

Adjustable Flux Three-Phase AC Machines With Combined Multiple-Step Star-Delta Winding Connections

Adjustable flux three phase a.c. machines with combined multiple-step star-delta winding connections

Analysis of vibration and noise of induction motor equipped with concentric single-double-layer star-delta winding

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