Structure improvement of attraction plate of electromagnetic doorlock

A structure improvement of attraction plate of electromagnetic doorlock, comprising:

• an electric magnet;
• an attraction plate, having an attraction surface, the attraction surface arranged at a corresponding surface of the electric magnet, and the attraction plate positioned on a mounted body, wherein
• a positioning assembly is positioned on the mounted body at the position close to both ends of the attraction plate, the attraction surface has a recessed portion below the horizontal plane of 0.06 mm to 0.26 mm at a central region thereof, and the recessed portion extends towards both ends to form an arc surface, so that a concave-arc surface is formed with both ends lower than the central region;
• whereby when the attraction plate is attracted by the magnetic force produced by the electric magnet, the concave-arc surface is forced to deform for abutting the electric magnet;
• when the mounted body is pulled in an opposite direction of the electric magnet, both ends of the attraction plate under the tension of a positioning assembly is corresponding to both ends of the electric magnet to enhance the tensile value of the attraction plate.