JPS6223059Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a multipolar magnetized iron core that generates a rotating magnetic field.

Conventional technology When performing magnetic flaw detection or demagnetization of ferromagnetic materials 2
There is a method using a multi-pole magnetization yoke such as a pole or a three-pole or four-pole magnetization yoke. In this method, currents with different phase shifts are applied to the coils of the multi-pole magnetizing yoke, and the resulting rotating magnetic field simultaneously demagnetizes residual magnetism in multiple directions. . By the way, when a rotating magnetic field is generated as described above, a rotating magnetic field is also generated inside the iron core, and with the normal construction of the iron core, the magnetic flux passing through the inside of the iron core is perpendicular to the plane of the electromagnetic steel sheet or at a certain angle, so magnetic resistance occurs. However, this method has disadvantages such as a decrease in efficiency and the fact that it cannot be used for a long period of time due to the occurrence of generation.

That is, what is shown in FIG. 1 is an iron core 1 of a four-pole magnetized yoke that is normally assembled in the past.As is clear from the figure, the iron core 1 uses electromagnetic steel sheets 1' having a shape and an I shape. The electromagnetic steel sheets 1' have a structure in which their planar directions are stacked one on top of the other.

And coils 2a, 2b, 2c, 2d on iron core 1
, and connect them as shown in the wiring diagram shown in Fig. 5 (this diagram is drawn as a wiring diagram of the present invention, but the wiring is the same as the conventional one), and connect each coil 2.
A, 2b, 2c, and 2d are supplied with alternating current or half-wave rectified direct current with a phase shift of 120°. This generates a rotating magnetic field. In this way, the coils 2a, 2
When a current is passed through b, 2c, and 2d, a magnetic flux Φa is generated in the iron core 1 as well, as shown in FIG. In this case, since the magnetic flux Φa' portion is perpendicular to the plane of the electromagnetic steel plates 1', 1', heat is likely to be generated, resulting in a decrease in efficiency. To prevent this, Figure 3A,
There is a method of using an iron core 1a that separates the magnetic paths as shown in B, or using a wound iron core 1b to pass the rotating magnetic flux generated inside in the plane direction of the electromagnetic steel sheet. However, the former iron core 1a requires an additional iron core for the intersecting portions, and the latter iron core 1b has drawbacks such as being relatively expensive due to manufacturing considerations.

Problems to be Solved by the Invention An object of the invention is to provide a multipolar magnetized core that eliminates the above-mentioned drawbacks by only changing a part of the combination of electromagnetic steel plates.

Means for solving the problems The means of the present invention is (a) I-shaped electromagnetic steel plates 10'a are arranged horizontally and overlapped to form the iron core 10a,
(b) Iron core 10b on both sides or both ends of the iron core 10a,
(c) The iron cores 10b, 10b on both sides or both ends of the iron core 10a are constructed so that the magnetic flux passing through the inside of the iron core is in the plane direction of the electromagnetic steel sheet.

Embodiment As shown in FIG. 4, the iron core 10 of the present invention is constructed by combining two long and short I-shaped electromagnetic steel plates 10'a and 10'b as shown. That is, an iron core is formed by arranging relatively long electromagnetic steel plates 10'a horizontally and overlapping each other, and an iron core 10a formed by arranging electromagnetic steel plates 10'b and 10'b vertically and overlapping each other on both sides of the iron core 10a. 10b, 10b are integrally combined via an eddy current prevention insulating plate 11 to form an iron core 10, and a coil 12 is attached to each iron core 10b, 10b.
Wrap wires a, 12b, 12c, and 12d and connect them as shown in FIG. Note that the method of wiring and the method of flowing current are no different from conventional methods.

Furthermore, what is shown in FIG. 7 shows an iron core 10' according to another embodiment of the present invention, in which the iron core 1 is formed by stacking I-shaped electromagnetic steel sheets horizontally arranged.
It is formed by integrally combining an arc-shaped iron core 10a at both ends of 0a and arc-shaped iron cores 10b, 10b at both ends with an eddy current prevention insulating plate 11 interposed therebetween. A coil is wound around both ends of each of the iron cores 10b, 10b in the same manner as the above coil (the coil is not shown).

Coils 12a, 12b configured as above,
When a current is passed through the iron cores 12c and 12d, magnetic flux Φb flows through the iron cores 10a and 10b as shown in FIG. 6, similar to the conventional example shown in FIG. In this case, all the magnetic flux Φb flows in the plane direction of the electromagnetic steel plates 10'a and 10'b, so there is almost no loss and no heat is generated. Note that magnetic flux Φc similarly flows in the plane direction of the electromagnetic steel sheet with respect to the iron core 10' shown in FIG.

Effects of the invention The present invention is as described above, and since the iron cores do not cross and do not use a wound core, it reliably prevents the occurrence of heat generation, loss, etc. Its practical value as a multipolar magnetized iron core is extremely great, and it will be widely used in the future.

[Brief explanation of drawings]

Figure 1 is a perspective view showing an example of a conventional multi-pole magnetized core, Figure 2 is a plan view showing a state in which magnetic flux flows through the core in Figure 1, and Figure 3 is an example of another conventional core. 4 is a perspective view showing an embodiment of the multi-polar magnetized core of the present invention, FIG. 5 is a wiring diagram showing the wiring state of the coil, and FIG. 6 is a state in which magnetic flux flows through the core shown in FIG. 4. FIG. 7 is a perspective view showing another embodiment of the iron core of the present invention. 10a, 10b...iron core, 10'...magnetic steel plate.

Claims (1)

[Utility Model Claims] A multi-pole magnetized core structure consisting of the combination of the following three elements: (a) I-shaped electromagnetic steel sheets 10'a are arranged horizontally and stacked to form the core 10a; (b) The core 10 is provided on both sides or both ends of the core 10a.
(c) The iron cores 10b on both sides or both ends of the iron core 10a,
10b is configured so that the magnetic flux passing through the inside of the iron core is in the plane direction of the electromagnetic steel sheet.