Iron loss and eddy-current loss analysis in a low-power BLDC motor with magnet segmentation

• Autorzy: Młot A. , Korkosz M. , Łukaniszyn M.
• Języki publikacji: EN

Abstrakty

EN

This paper considers a Brushless Direct Current (BLDC) machine prototype with six poles and 36 stator slots including a three phase double-layered distributed winding. Presented modifications of rotor construction are identified in order to achieve the best possible compromise of eddy-current losses and cogging torque characteristics. The permanent magnet (PM) eddy-current loss is relatively low compared with the iron loss; it may cause significant heating of the PMs due to the relatively poor heat dissipation from the rotor and it results in partial irreversible demagnetization. A reduction in both losses is achieved by magnet segmentation mounted on the rotor. Various numbers of magnet segmentation is analysed. The presented work concerns the computation of the no-load iron loss in the stator, rotor yoke and eddy-current loss in the magnets. It is shown that the construction of the rotor with segmented magnets can significantly reduce the PM loss (eddy-current loss). The eddy-current loss in PMs is caused by several machine features; the winding structure and large stator slot openings cause flux den sity variations that induce eddy-currents in the PMs. The effect of these changes on the BLDC motor design is examined in order to improve the machine performance. 3-D finite-element analysis (FEA) is used to investigate the electromagnetic behaviour of the BLDC motor.

Słowa kluczowe

EN

BLDC motor; iron loss; eddy current losses; permanent magnet segmentation; cogging torque reduction; magnet layers

PL

straty żelaza; straty wieloprądowe; warstwa magnetyczna

• Wydawca: Polish Academy of Sciences, Committee on Electrical Engineering
• Czasopismo: Archives of Electrical Engineering
• Rocznik: 2012
• Tom: Vol. 61, nr 1
• Strony: 33--46
• Opis fizyczny: Bibliogr. 15 poz., rys. tab.

Twórcy

autor

Młot A.

autor

Korkosz M.

autor

Łukaniszyn M.

• Faculty of Electrical Engineering, Automatic Control and Informatics Opole University of Technology

Bibliografia

• [1] Chen Y., Zhu Z.Q., Howe D., Gliemann J.H., Rotor eddy current loss in single-phase permanent magnet brushless DC motor. Industry Applications Conference, 42nd IAS Annual Meeting, Conference Record of the 2007 IEEE, pp. 537-543 (2007).
• [2] Ionel D.M., Popescu M., Cossar C. et al. A general model for estimating the laminated steel losses under PWM voltage supply. IEEE Transactions on Industry Applications 46(4): 1389-1396 (2010).
• [3] Boglietti A., Cavagnino A., Ionel D.M. et al. A general model to predict the iron losses in inwerter fed induction motors. Energy Conversion Congress and Exposition, ECCE 2009, IEEE, pp. 1067- 1074 (2009).
• [4] Mlot A., Lukaniszyn M., Optimization of the PM array of brushless DC motor for minimum jogging torque. Przegląd Elektrotechniczny 12: 68-70 (2008).
• [5] Lukaniszyn M., Jagiela M., Wrobel R., Optimization of permanent magnet shape for minimum jogging torque using a genetic algorithm, IEEE Transactions on Magnetics. 40(2): 1228-1231 (2004).
• [6] Korkosz M., Mlot A., Torque ripple reduction by using multi-slice FE modelling of brushless DC motor with skewed magnets, Zeszyty Problemowe – Maszyny Elektryczne 86: 105-108 (2010), (In Polish).
• [7] Lukaniszyn M. Mlot A., Torque characteristics of BLDC motor with multipolar excitation. The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, COMPEL 28(1): 178-187 (2009).
• [8] Cassat A., Espanet C., Wavre N., BLDC motor stator and rotor iron losses and thermal behavior based on lumped schemes and 3D FEM analysis. Industry Applications Conference 4: 2469-2476 (2002).
• [9] Kohan N.A., Abbaszadeh K., Influence of nonsinusoidal flux waveform on transformer design methodology. 1st Power Electronic & Drive System & Technologies Conference, pp. 57-62 (2010).
• [10] Chen Y., Pillay P., An improved formula for lamination core loss calculations in machines operating with high frequency and high flux density excitation. Industry Applications Conference, 2: 759-766 (2002).
• [11] Bertotti G., General properties of power losses in soft ferromagnetic materials. IEEE Transactions on Magnetics 24(1): 621-630 (1988).
• [12] Benarous M., Investigation of rotor loss due to current communication in a permanent magnet brushless DC motor. Power Electronics, Machines and Drives. The 3rd IET International Conference, pp. 546-550 (2006).
• [13] Cedrat, Flux3D, User’s Guide 3 (2008).
• [14] Yamazaki K., Fukushima Yu., Effect of eddy-current loss reduction by magnet segmentation In synchronous motors with concentrated windings. Electrical Machines and System, ICEMS, pp. 1-6 (2009).
• [15] Mlot A., Korkosz M., Lukaniszyn M., Analysis of Iron and Eddy-Current Loss in Low-Power BLDCMotor with Magnet Segmentations, Zeszyty Problemowe – Maszyny Elektryczne 93: 59-64 (2011).