JPH01113303U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a polarized electromagnet according to an embodiment of this invention, Fig. 2 is a diagram schematically showing the magnetic circuit of the one shown in Fig. 1, and Fig. 3 is a perspective view of a polarized electromagnet according to another embodiment of this invention. FIG. 4 is a perspective view of a conventional polarized electromagnet, and FIGS. 5 and 6 are schematic magnetic circuit diagrams for explaining the operation of the polarized electromagnet shown in FIG. 4. In the figure, 1 is the first yoke, 101, 10
2 is both legs, 2 is an excitation coil, 3A is a permanent magnet device, 301, 301A is a second yoke, 30
2,303 is a bipolar permanent magnet, 304 is a sliding part,
305 is the part between permanent magnets 302 and 303, 4A
is amateur, 401 and 402 are its suction parts, 4
03A is a crosslinked portion. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] a substantially U-shaped first yoke; an excitation coil wound around the yoke; a permanent magnet device disposed between both legs of the first yoke with magnetic poles of the same polarity facing each other; and an armature consisting of both adsorption parts facing the outer surfaces of both legs of the first yoke and a bridge part that interconnects these adsorption parts, and a part of the bridge part of the armature is connected to the permanent magnet device. The armature is brought into contact with each other by making the distance between the inner surfaces of both attraction parts of the armature larger than the distance between the outer surfaces of both legs of the first yoke, and switching the direction of the current flowing through the excitation coil. In the polarized electromagnet configured to slide reciprocally along the permanent magnet device, the permanent magnet device is connected to a second yoke disposed at a center between both legs of the first yoke, and a pair of bipolar permanent magnets arranged between the yoke and each leg of the first yoke with magnetic poles of the same polarity facing each leg of the first yoke; The yoke is made to protrude toward the bridge portion of the armature, and the bridge portion is made into a flat plate so that it comes into sliding contact with the second yoke, and the dimension of the second yoke in the reciprocating sliding direction of the armature is adjusted. A polarized electromagnet characterized in that a portion in sliding contact with the bridge portion is larger than a portion between the bipolar permanent magnets.