TY - GEN
T1 - Design of shading coils for minimizing the contact bouncing of AC contactors
AU - Riba, J. R.
AU - Espinosa, A. G.
AU - CusidóJ.,
AU - Ortega, J. A.
AU - Romeral, L.
PY - 2008
Y1 - 2008
N2 - For many decades, electromechanical contactors have been widely used in the industry, and over 80% are equipped with AC powered coils. Electromechanical contactors have the drawback of the mechanical movement of some of their parts and the wear related with it. This movement causes the contacts to impact during closure, producing a bouncing of the contacts and consequently the estimated life of the contacts is dramatically reduced. The coil of the contactor can be powered by an AC or a DC supply. When dealing with DC powered coils, they generate a constant magnetic field that guarantees an appropriate closing of the contacts. However, AC powered coils generate sinusoidal magnetic fields which produce a force that drops to zero twice each cycle (50/60 Hz). This creates an undesired chatter or pulsation of the contacts. This harmful effect can be cancelled by using a shading ring placed in the contactor core. In a welldesigned shaded pole contactor the magnetic force should never drop below the springs force in order to avoid the chattering of the contacts. In this work the influence of shading rings parameters on the behavior of the dynamic response of the contactor is studied and results are presented.
AB - For many decades, electromechanical contactors have been widely used in the industry, and over 80% are equipped with AC powered coils. Electromechanical contactors have the drawback of the mechanical movement of some of their parts and the wear related with it. This movement causes the contacts to impact during closure, producing a bouncing of the contacts and consequently the estimated life of the contacts is dramatically reduced. The coil of the contactor can be powered by an AC or a DC supply. When dealing with DC powered coils, they generate a constant magnetic field that guarantees an appropriate closing of the contacts. However, AC powered coils generate sinusoidal magnetic fields which produce a force that drops to zero twice each cycle (50/60 Hz). This creates an undesired chatter or pulsation of the contacts. This harmful effect can be cancelled by using a shading ring placed in the contactor core. In a welldesigned shaded pole contactor the magnetic force should never drop below the springs force in order to avoid the chattering of the contacts. In this work the influence of shading rings parameters on the behavior of the dynamic response of the contactor is studied and results are presented.
KW - AC contactor,Shading ring,Contact bounce
UR - https://www.scopus.com/pages/publications/67249157811
U2 - 10.1109/HOLM.2008.ECP.34
DO - 10.1109/HOLM.2008.ECP.34
M3 - Conference contribution
AN - SCOPUS:67249157811
SN - 9781424419029
T3 - Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts
SP - 130
EP - 136
BT - 2008 Proceedings of the 54th IEEE Holm Conference on Electrical Contacts, HOLM 2008
T2 - 54th IEEE Holm Conference on Electrical Contacts, HOLM 2008
Y2 - 27 October 2008 through 29 October 2008
ER -