JPS61120649A - Electromagnetic crushing, mixing and stirring apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is a method for pulverizing a workpiece by the movement of a magnetic or non-magnetic working piece driven by an electromagnetic force generated by a pair of moving magnetic fields moving in opposite directions. , a device for mixing and stirring.

(0) Prior Art In recent years, technology has been developed that applies electromagnetic force to devices for crushing, mixing, and stirring. That is, a linear induction motor (hereinafter referred to as LIM) serves as a moving magnetic field generating device that generates moving magnetic fields in opposite directions across a predetermined space.
A working piece made of a ferromagnetic or non-magnetic conductive material through which an induced current can flow and a container containing a workpiece are arranged in the space between them, and the working piece is rotated by the magnetomotive force from each LIM. As it moves, it also moves in the direction of the advancing magnetic field and performs circular motion.

As a result, the object to be processed is crushed.

Mixing or stirring is done. These structures will be explained based on the drawings.

Figure 3 is a schematic block diagram of a crushing, mixing, and stirring device using LIM, Figure 4 is a schematic block diagram of one using an arc-shaped induction motor, and Figures 5 (a), (b), (c), and Figures 6(a) and 6(b) are examples of conventional ones; Figures 5(a) and 6(a) are explanatory diagrams for explaining the phase zone of LIM, and Figure 5(b) is an explanatory diagram for explaining the phase zone of LIM. The magnetomotive force line diagram in Fig. 5(a), Fig. 5(C) and Fig. 6(b) are respectively 5
FIG. 6 is a composite magnetic field distribution diagram of FIG. 6(a) and FIG. 6(a).

In FIG. 3, a moving magnetic field generating device having magnetic poles arranged opposite to each other and generating moving magnetic fields in opposite directions, for example, a LIM (primary side with three-phase winding or multi-phase winding) is shown. ) A container 5 containing a working piece 3 made of a ferromagnetic or non-magnetic conductive material and a workpiece 4 made of a mixture of pigments and the like is disposed in the middle of the parts 1 and 2. The difference in FIG. 4 from that shown in FIG. 3 is that the surfaces of the LIMs 1', 2' and the container 5' have convex and concave arc shapes, respectively. Here, LIMI,
2 and LIM 1', 2' have similar effects on the working piece 3 and the workpiece 4, so LIM 1
The effect will be explained below by taking 2 and 2 as examples.

When LIMI, 2 is energized in the state configured as above, the working piece 3 becomes a different LIMI.

Under the action of the moving magnetic field 2, it performs a complicated movement involving rotation and movement, and repeatedly collides with the object 4 to perform a pulverizing action, thereby turning it into fine powder. The operations for mixing and stirring are the same.

In addition, the one shown in Fig. 4, or the one not shown here, which generates moving magnetic fields in opposite directions in the stator and fixed rotor of a normal wound induction motor, is also similar to the one described above. It works the same way.

(c) Problems to be solved by the invention Conventional devices have LIMI, 2 or arcuate LIM 1'
.

Since the number of poles 2' is the same, the following problems occur.

(1) When the number of poles of LIMI and LIM2 is the same, if the direction of the moving magnetic field is reversed, only the negative phase is different from the other phases, resulting in current imbalance and copper loss.

(2) LIMI, 2 or arcuate LIM 1'
, 2' generate moving magnetic fields in opposite directions, so
The voltage induced by the magnetic flux of the other party is a reverse phase voltage in the symmetrical coordinate method, and causes opposite sequence currents to flow in the wire rings of the other party, resulting in unnecessary copper loss.

(3) Due to the causes mentioned in (1) and (2), the movement of the object 4 in the container 5 or 5' may become stagnant or
gather only in certain places.

The cause of this problem will be explained below.

FIG. 5(a) is for explaining the phase bands of the LIM, where U, V, and W indicate each phase of a three-phase power supply, and U'.

v' and vv' indicate the phases that reverse the current direction of phases U, V, and W, and the magnetomotive force line diagram for each phase band of the 4-pole LI supply LIM 2a is from mode ■ in the figure (b) to mode It is shown by steps up to ■, and the magnetomotive force fluctuation during one cycle is shown by LIMI and LIM in the direction of arrow B and arrow B in each 60° electrical angle.
2a has been moved. It is assumed that the magnetomotive force fs of LIM 1 and the magnetomotive force fs of LIM2a are equal. In general, in LIM, the windings are distributed and wound, so the distribution of magnetomotive force changes in a fine step-like manner, but to simplify the illustration, each phase band is represented by one rectangular wave. do.

Next, the composite magnetic field distribution diagram obtained by combining the phase zone magnetomotive force diagrams of LIM 1 and LIM 2a shown in figure (b) is shown in figure (C).0 In figure (C), mode ■ is mode ■' , mode ■
is mode ■′, mode ■ is mode ■′, mode ■ is mode ■′, mode ■ is mode ■′, mode ■ is mode ■′
correspond to each.

Thus, in modes ■' to ■', phases W and A shown in Fig. (a) always oppose each other, and the magnetomotive force cancels each other in this part, and the other phases Utcf and V are different phases. They are facing each other.

That is, the magnetomotive force becomes zero in the portion P where the phases W and W' face each other, and the magnetomotive force does not become zero in the other phases U, U', V, and V', but a combined magnetomotive force is generated.

This means that opposite LIM 1, 2a with the same number of poles
It can be seen that when the direction of the moving magnetic field is reversed, only one phase is different from the other phases, and the magnetic fields cancel each other out, resulting in an increase in current, resulting in current imbalance, which causes copper loss.

Furthermore, eLIMl and LIM2a have the same number of poles, and LIMl
The phase bands are the same as the arrangement shown in Figure 5(a), and I, IM
A case where the arrangement of the second phase belt is changed will be explained below.

In Figures 6(a) and (b), 2b is the same as in Figure 5(a).
By changing the phase device of the phase band of LIM2a shown in 1, in 4LIM, each phase of the phase band is ty, v, w, a', v', w'<,
Teso U.

W, V, U', W', and V' are facing each other. Note that since the magnetomotive force line diagram is similar to the magnetomotive force line diagram shown in FIG. 5(b), its explanation will be omitted here.

Thus, in modes 2' to 2' shown in FIG. 6(b), the combined magnetic field becomes unbalanced depending on the phase. That is, in (a) the part where phases U and U face each other and the part where phases σ and U' face each other generate a strong magnetic field depending on the mode, so the magnetic flux is strong with each other, and only the U phase has a current of 0. becomes. 2 LIM 1,
2b, the current becomes small and unnecessary copper loss occurs.

The causes of the above-mentioned problems are that the windings of each phase, which are normally manufactured uniformly, are partially abnormally heated, and that the copper wire material is wasted. Furthermore, due to the current imbalance of each phase and the imbalance of negative phase current, the movement of the object to be processed in the container may become stagnant, or
This resulted in the processed materials only gathering in certain areas.

In order to prevent this, conventionally, partition walls were provided inside the container 5 for each pole pitch, or the container 5 was separated from LIM1 and 2.
Proposals have been made to avoid these negative effects by moving the object relative to the object.

However, using such means inevitably leads to mechanical imbalance of multiple currents.

(2) Means for Solving the Problems The present invention solves the problem by solving the above-mentioned unbalance of current between each phase, the flow of negative phase current, and the constant formation of small and large areas in the magnetic field distribution. As a means to solve the problem that the object 4 does not move smoothly, the number of poles on either one of the moving magnetic field generators is made twice as many as the number of poles on the other. In addition, one phase band with a smaller number of poles and the two phase bands with a larger number of poles opposing this phase band make up three phase bands that include all three phases of the power supply. let

(E) Effect The effect is that if the number of poles is chosen as 1:2 on the opposite LIMK and each phase band is connected in series, even if each phase flows, no voltage will be induced in the other winding. .

Therefore, even if the direction of the moving magnetic field is reversed, no negative phase current will flow, and there is no mutual inductance.
-The phase alone is different from other phases and does not become unbalanced. Embodiments of the present invention will be described in detail below with reference to the drawings.

(f) Example Figures 1 (a), (b), and (C) show electromagnetic pulverization according to the present invention.

One embodiment of the mixing and stirring device, (a) is an explanatory diagram for explaining the phase zone of LIM, and (b) is its magnetomotive force line diagram.

(c) Figure is the composite magnetic field distribution diagram of Figure (b), Figure 2 (a)
, (b) is another example, (a) is an explanatory diagram similar to FIG. 1(a), and FIG. 1(b) is a composite magnetic field distribution diagram similar to FIG. 1(c). In addition, in the drawings and in the explanation, the same reference numerals as in FIGS. 3 and 5 have the same functions, so the explanation thereof will be omitted here.

In Fig. 1(a), the number of poles on one side of the moving magnetic field generator is twice as many as on the other, and one phase band with the smaller number of poles and this phase band are opposite to each other. The three phase bands including the two phase bands with the largest number of poles include all three phases of the power supply.

In other words, the phase U of one phase band on the LIMIa side of the two poles is 4.
The phases v' and w of the two phase bands on the LIM2c side of the pole are opposite,
These three phase bands include all three phases of the power supply and LIM
The number of poles on the LIM2c side is four, whereas the number of poles on the Pa is two. Note that the phase band here indicates the band shape of the phase that constitutes the pole.

In addition, in Figure 2 (a), the number of poles on either one of the moving magnetic field generators is twice the number of poles on the other, but one phase belt with the smaller number of poles and this phase belt The three phase bands including the two phase bands with the larger number of opposing poles do not include all three phases of the power supply.

However, these three phase bands do not include phase V, and phase U overlaps. This can be seen by looking at other phase bands as well, where the l phase is missing and one other phase overlaps.

Next, LIMla and LIM2c shown in FIG. 1(a)
The magnetomotive force line diagram of the phase zone is shown in Fig. 1(b). Note that the magnetomotive force line diagram is similar to ■ to ■ in Figure 5(b), so only mode ■, which approximates the temporal change in magnetic field strength when the electrical angle is a certain value, is shown. Other modes have been omitted. Also, the magnetomotive force at the intermediate portion between LIMIB and LIK2c is the fifth
As explained in Figure (b), they are assumed to be equal.

LIM further advanced by 60° in magnetomotive force lines■ and electrical angle
The composite magnetic field distribution of the magnetomotive force lines of one cycle of la and LIM2c is shown in FIG. 1(c), and this distribution will be explained below.

In Figure 1 (C), the composite magnetic field distribution advanced by 60 degrees in electrical angle is represented by modes ■' to ■'. For example, the magnetomotive force line ■ shown in Figure 1 (b) is the composite magnetic field distribution mode ■'
corresponds to

The strength of the magnetic field is neither strengthened nor weakened unilaterally, and there are no consistently strong or weak places.

This means that an unbalance of current will not occur in the three phase bands, and a negative phase current will not flow in the other wire.

Therefore, in the second embodiment of the other embodiment, the movement of the objects 4 in the container 5 shown in FIG. Figure (b) is similar to the composite magnetic field distribution shown in Figure 1 (c), and shows modes ■' to ■' of 1 cycle.

In Fig. 2(b), the average magnetic field distribution in the intermediate portion between LIMla, I, and IM2d is unilaterally strengthened or weakened in some places, resulting in constant magnetic field imbalance, which is an unfavorable arrangement. It is. Therefore, there is a possibility that the processed material 4 shown in FIG. 3 stagnates or becomes inactive. However, if the windings of s LIMla and LIM2d are all connected in series, the respective magnetic fields cancel each other out between the terminals, and no current imbalance occurs.

In addition, the thing according to the present invention has an arc shape as shown in FIG. Needless to say, this also applies to MM.

According to the present invention, as described in the detailed description of the invention, LIMla and LIM
By setting the pole number ratio to 1:2, it is possible to avoid negative phase current from flowing or phase current from becoming unbalanced, thereby reducing copper loss. Furthermore, electrically changing the arrangement of the phase bands makes the distribution of the magnetic field uneven, making it difficult to handle by installing partitions inside the container, or requiring complex mechanisms such as mechanically moving the container. Without this, stagnation of the material and inactivity of the material can be avoided, and efficient grinding, mixing, and agitation can be performed.

Therefore, the electromagnetic pulverization, mixing, and stirring apparatus according to the present invention is highly practical as an apparatus for pulverizing, mixing, or stirring objects to be processed.

[Brief explanation of the drawing]

FIGS. 1(a), (b), and (c) show electromagnetic pulverization according to the present invention. One embodiment of the mixing and stirring device, (a) is an explanatory diagram for explaining the phase zone of LIM, and (b) is its magnetomotive force line diagram. (C) Figure is the composite magnetic field distribution diagram of Figure (b), Figure 2 (a)
, (b) is another example, (a) is an explanatory diagram similar to Fig. 1 (a), (b) is a composite magnetic field distribution diagram similar to Fig. 1 (c), and Fig. 3 is an explanatory diagram similar to Fig. 1 (c). (C) and Figure 6 (a), (
b) is an example of the conventional one, Fig. 5(a) and Fig. 6(a) are respectively explanatory diagrams similar to Fig. 1(a), and Fig. 5(b) is an example of Fig. 5(a). The magnetomotive force diagrams, FIG. 5(c) and FIG. 6(b), are composite magnetic field distribution diagrams similar to FIG. 1(C), respectively. 1, 1', la, 2.2', 2a, 2b, 2c, 2
d Mountain = Linear induction motor (LIM), 3...
Working piece, 4... Workpiece, 5.5'
...container, U, U', V. v', w, w'... Phases of 3-phase power supply.

Claims (2)

[Claims] (1) A container in which a working piece of ferromagnetic or non-magnetic conductive material and an object to be processed are housed in the middle part of a pair of moving magnetic field generators that are arranged opposite to each other and generate moving magnetic fields in opposite directions. In an apparatus in which a working piece is moved by the action of a moving magnetic field from a moving magnetic field generating device, and the working piece pulverizes, mixes, stirs, etc. a workpiece, one of the moving magnetic field generating devices An electromagnetic grinding, mixing, and stirring device characterized in that the number of poles is twice that of the other pole. (2) One phase band with a smaller number of poles and the two phase bands with a larger number of poles facing each other make three phase bands that cover all three phases of the power supply. An electromagnetic crushing, mixing, and stirring device according to claim 1, characterized in that the device comprises: