TY - GEN

T1 - Investigation of the effect of pole shape on braking torque for a low power eddy current brake by finite elements method

AU - Gulbahce, Mehmet Onur

AU - Kocabas, Derya Ahmet

AU - Nayman, Fatmanur

PY - 2013

Y1 - 2013

N2 - The principle of electromagnetic braking involves the conversion of kinetic energy into thermal energy. When a non-magnetic or magnetic conductive material rotates into static magnetic field, eddy currents are induced in material. Paths of induced eddy currents depend on the geometrical configuration of moving conductive material and also its electromagnetic properties. However, due to electrical resistance of the conductive material, the eddy currents are disrupted into heat and braking torque occurs. In practice, eddy current brakes are frequently used for motor testing because of the easiness of braking torque control. It is also used as supplementary retardation equipment in addition regular friction brakes on heavy vehicles. Mathematical analysis of the effects of eddy currents is almost impossible due to the complexity of electromagnetic problem. There is no obtained certain relationship which can explain output data in terms of input data since relation includes too many variables including conductive disk areas, conductive disk thickness, conductive disk radius, speed etc. In this study, braking effects of two different eddy current brakes having different pole shapes are compared. Round and rectangular pole shape which have the same pole area are analysed where all numerical design constraints were kept unchanged to compare braking torque vs speed characteristics and total power dissipation on rotating disk. All mentioned designs are analysed by commercial software using finite element method (FEM).

AB - The principle of electromagnetic braking involves the conversion of kinetic energy into thermal energy. When a non-magnetic or magnetic conductive material rotates into static magnetic field, eddy currents are induced in material. Paths of induced eddy currents depend on the geometrical configuration of moving conductive material and also its electromagnetic properties. However, due to electrical resistance of the conductive material, the eddy currents are disrupted into heat and braking torque occurs. In practice, eddy current brakes are frequently used for motor testing because of the easiness of braking torque control. It is also used as supplementary retardation equipment in addition regular friction brakes on heavy vehicles. Mathematical analysis of the effects of eddy currents is almost impossible due to the complexity of electromagnetic problem. There is no obtained certain relationship which can explain output data in terms of input data since relation includes too many variables including conductive disk areas, conductive disk thickness, conductive disk radius, speed etc. In this study, braking effects of two different eddy current brakes having different pole shapes are compared. Round and rectangular pole shape which have the same pole area are analysed where all numerical design constraints were kept unchanged to compare braking torque vs speed characteristics and total power dissipation on rotating disk. All mentioned designs are analysed by commercial software using finite element method (FEM).

UR - http://www.scopus.com/inward/record.url?scp=84894181690&partnerID=8YFLogxK

U2 - 10.1109/eleco.2013.6713844

DO - 10.1109/eleco.2013.6713844

M3 - Conference contribution

AN - SCOPUS:84894181690

SN - 9786050105049

T3 - ELECO 2013 - 8th International Conference on Electrical and Electronics Engineering

SP - 263

EP - 267

BT - ELECO 2013 - 8th International Conference on Electrical and Electronics Engineering

PB - IEEE Computer Society

T2 - 8th International Conference on Electrical and Electronics Engineering, ELECO 2013

Y2 - 28 November 2013 through 30 November 2013

ER -