US 12,278,069 B2
Electromagnetic contactor for star-delta driving
Tae Jung Kim, Incheon (KR); and Dong Hee Kim, Incheon (KR)
Assigned to Tae Jung Kim, Incheon (KR)
Appl. No. 17/915,791
Filed by Tae Jung Kim, Incheon (KR)
PCT Filed Mar. 31, 2021, PCT No. PCT/KR2021/003988
§ 371(c)(1), (2) Date Sep. 29, 2022,
PCT Pub. No. WO2021/201590, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 10-2020-0039570 (KR), filed on Apr. 1, 2020.
Prior Publication US 2023/0253171 A1, Aug. 10, 2023
Int. Cl. H01H 50/02 (2006.01); H01H 50/00 (2006.01); H01H 50/44 (2006.01); H01H 50/56 (2006.01); H02P 1/32 (2006.01)
CPC H01H 50/002 (2013.01) [H01H 50/443 (2013.01); H01H 50/56 (2013.01); H02P 1/32 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An electromagnetic contactor for star-delta driving comprising a magnetic contactor main (MCM) for opening/closing a main circuit and a magnetic contactor delta (MCD) for a delta connection driving, which respectively include:
crossbars installed in an inner space formed by an upper frame and a lower frame;
movable cores connected to lower portions of the crossbars;
fixed cores spaced apart at a predetermined distance below the movable cores; and
working coils installed in the fixed cores, and back springs installed inside the movable cores,
wherein movable contacts are installed on upper portions of the crossbars so as to be in electrical contact with fixed contacts,
the MCM is provided with first starting terminals electrically connected to one terminals (U/V/W) of a motor and first connection terminals electrically connected to the MCD,
the MCD is provided with second connection terminal electrically connected to the MCM and second starting terminals electrically connected to the other terminals (X/Y/Z) of the motor and a magnetic contactor Y (MCY) for starting Y connection,
the first connection terminals of the MCM and the second connection terminals of the MCD form a common contact connected to a power supply line of a main power supply.