F E M B M P D A

Kiran George1, Shinoy K S2

1. M A College of Engineering, Electrical and Electronics, Kothamangalam, Ernakulam, Kerala

2. ISRO, Electrical and Electronics, Trivandrum, Kerala

Introduction: COMSOL multiphysics is used inpredicting the output of a five phase Brushless DCmotor. The software is found to be reliable where thesimulation helped in predicting the flux path, magneticflux density, back emf generated and in computing thetorque before fabrication and hence exploring theadvantage of a multiphase topology.

Computational Methods: The FEM of motor is modeledwithin the AC/DC module, rotating machinery. The stator

Results: The simulation is carried out in order tostudy the performance of the proposed five phasemotor . This helps in understanding whether thedesign could meet the requirements. Thesimulated waveforms are shown as below.

within the AC/DC module, rotating machinery. The statorcontains the five phase windings . The rotor consists ofthe permanent magnets . The material properties of bothstator and rotor are given through the subdomainsettings. The flux density in the airgap, back emfgenerated, torque are computed in the analysis. Theemf generated is solved by:

The model of the meshed motor is shown below.

Conclusions: From figure1 and figure 6, the airgapflux density and torque wave is studied. Figure 5,Itcan be seen that the ripple amplitude has reducedand the frequency of pulsation has increased. Figure2, it is seen that the voltage across adjacent and nonadjacent phases are different. These reveals thecharacteristics of a multiphase topology.

References:[1] Marco Villani, Marco Tursini, Giuseppe Fabri, andLuca Castellini, High Reliability Permanent MagnetBrushless Motor Drive for Aircraft application”, IEEEtransactions on industrial electronics, vol. 59, no. 5,May 2012.[2] M. Villani, M. Tursini, G. Fabri, L. Castellini,” Fault-Tolerant PM Brushless DC Drive for AerospaceApplication”, XIX International Conference onElectrical Machines - ICEM 2010, Rome.

= dAEA

LNNV z

windingsi

1. M A College of Engineering, Electrical and Electronics, Kothamangalam, Ernakulam, Kerala

2. ISRO, Electrical and Electronics, Trivandrumm, Keram

F E M B MP D AP D A

Ki G 1 Shi K S2