Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including means for using – or compensating for – the induced...
Patent
1984-05-02
1987-03-31
Hix, L. T.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Including means for using, or compensating for, the induced...
361194, 335131, H01H 4710
Patent
active
046547444
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an electromagnetic contactor for controlling the opening and closing of an electric circuit for an electric motor or the like. More particularly it concerns an electromagnetic contactor comprising a mounting pedestal having a rectifier circuit disposed therein, a stationary iron core disposed on the mounting pedestal and having an operating coil wound around the same, and a movable iron core disposed oppositely to this stationary iron core to be spaced therefrom by a predetermined spacing and always urged away from the stationary iron core side by means of a kickout spring, whereby an AC voltage applied to the operating coil is changed to a direct current.
PRIOR ART
FIGS. 1(a)-1(c) show a conventional electromagnetic contactor. In the Figures reference numeral 1 designates a box shaped mounting pedestal formed of an insulating material, provided with a plurality of mounting holes 1a in order to mount the main body of the electromagnetic contactor on a mounting panel or the like. A base 2 is fixed to the mounting pedestal 1 by fastening screws 3, the base being composed of an insulated material. A stationary iron core 4 in the shape of an E is formed of silicon steel laminations stacked on one another, a buffer spring 5 is disposed between this stationary iron core 4 and the mounting pedestal 1, and an operating coil 6 is disposed around a central leg of the E-shaped stationary iron core 4 and held by having its lower surface abutting against the stationary iron core 4 and its upper surface abutting against the base 2. Leads 7 are provided for connecting this operating coil 6 to coil 6 to coil terminals 8, and a movable iron core 9 is disposed oppositely to the stationary iron core 4 to have a predetermined spacing therebetween and constructed so that, when a driving voltage is applied to the operating coil 6, it is attracted by the stationary iron core 4. A cross bar 10 formed of an insulating material is connected to the movable iron core 9 through a pin 11. A kickout spring 12 disposed between the cross bar 10 and the mounting pedestal 1 acts to urge the cross bar 10 upward as viewed in the figures. A movable contactor 13 provided with a movable contact 14, is inserted into a holding hole 10a provided on the cross bar 10 and pressurized by a contactor spring 16 held by a spring support 15. A stationary contactor 17 provided with a stationary contact 18 opposing the movable contact 14 is fixed to the base 2 by means of its elasticity while having a terminal screws 19 for connection to an electrical wire for the main circuit. An arc runner 20 consisting of a magnetic metal 15 provided for a purpose of extinguishing an electric arc. The runner is fixed to the base 2 by means of its spring action.
Since the conventional electromagnetic contactor has the structure as described above, the application of a driving voltage to the operating coil 6 causes the generation of an electromagnetic attraction between the stationary iron core 4 and the movable iron core 9 due to a magnetic flux generated by this operating coil 6 thereby to attract the movable iron core 9 by the stationary iron core 4 against the kickout spring 12. This is followed by the cross bar 10 connected to the movable iron core 9 being moved to the side of the stationary iron core 4 to cause the movable contact 14 on the movable contactor 13 held by the cross bar 10 to abut against the stationary contact 18 on the stationary contactor 17. At that time, an iron core gap between the movable iron core 9 and the stationary iron core 4 is made up so as to be larger than a contact gap between the movable contact 14 and the stationary contact 18. Therefore, upon the closure of the iron cores, the cross bar 10 is moved more to the side of the stationary iron core 4 than the position where said contacts abut against each other. This causes the contact spring 16 to be compressed and deformed. This spring pressure is transmitted to the movable contactor 13 to close the contacts with a predetermined contact pressur
REFERENCES:
patent: 3717829 (1973-02-01), Flaherty
patent: 3832657 (1974-08-01), Hardman et al.
patent: 4481555 (1984-11-01), Yoshida et al.
Kakizoe Masahiro
Nishizako Shizutaka
Okado Hiroyuki
Sako Yuji
Gray David M.
Hix L. T,.
Mitsubishi Denki & Kabushiki Kaisha
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