JP7173501B2 - Electromagnetic pump for conductive liquid - Google Patents

Description

The present invention relates to electromagnetic pumps for transferring conductive liquids.

2. Description of the Related Art Conventionally, an electromagnetic pump is known that transfers conductive liquid such as liquid metal by electromagnetic force. For example, the electromagnetic pump of Patent Document 1 includes a duct, a core, multiple coils, and multiple yokes. A core is positioned within the duct. The duct forms an annular flow path with the core. Liquid metal flows through this annular channel. A plurality of coils are arranged around the respective ducts. The plurality of yokes are arranged apart from each other in the circumferential direction of the coil. Each of the multiple yokes includes multiple teeth. A plurality of teeth are arranged side by side in the axial direction of the duct and are integrally formed with each other. A coil is arranged between a plurality of teeth.

In the electromagnetic pump described above, a magnetic flux is generated through the yoke and the core when an alternating current flows through the coil. Then, an induced current flows through the liquid metal in the annular flow path as the magnetic flux density changes due to the alternating current. As a result, an electromagnetic force acts on the liquid metal in the annular channel, causing the liquid metal to move within the duct.

JP-A-59-76166

In the above electromagnetic pump, the plurality of yokes are arranged apart from each other in the circumferential direction of the coil. Therefore, no magnetic flux is generated where there is no yoke. Therefore, the electrical loss is large and the energy efficiency of the electromagnetic pump is low. An object of the present invention is to improve energy efficiency in electromagnetic pumps.

An electromagnetic pump according to one aspect of the present invention is an electromagnetic pump for transferring conductive liquid. An electromagnetic pump according to this aspect includes a duct, an inner core, a first phase coil, a second phase coil, and a first disk yoke. The duct extends in a predetermined axial direction. A conductive liquid flows through the duct. The inner core is positioned within the duct. The first phase coil is placed outside the duct and wound circularly around the duct. The second phase coil is placed outside the duct and wound circularly around the duct. The second phase coils are spaced axially from the first phase coils. The first disk yoke is arranged axially between the first phase coil and the second phase coil. The first disk yoke includes a first hole through which the duct passes, and has a circular plate-like shape.

In the electromagnetic pump according to this aspect, the first disk yoke has a circular plate shape. Therefore, there are few portions where the first disc yoke does not exist at the positions facing the first phase coil. Therefore, magnetic flux is generated in a wide range facing the first phase coil. This improves the energy efficiency of the electromagnetic pump.

The electromagnetic pump may further include a second disk yoke. The second disk yoke may be arranged on the side opposite to the first disk yoke with respect to the first phase coil. The second disc yoke may have a circular plate shape including a second hole through which the duct is passed. In this case, since the second disk yoke has a circular plate-like shape, magnetic flux is generated in a wide range facing the first phase coil. This improves the energy efficiency of the electromagnetic pump.

The electromagnetic pump may further include a third disk yoke. The third disc yoke may be arranged axially between the first disc yoke and the second phase coil, and may include a third hole through which the duct passes. The third disk yoke is separate from the first disk yoke, and may have a circular plate shape. In this case, since the third disk yoke has a circular plate-like shape, magnetic flux is generated in a wide range facing the second-phase coil. This improves the energy efficiency of the electromagnetic pump. Further, since the third disk yoke is separate from the first disk yoke, interference between the magnetic flux of the first phase coil and the magnetic flux of the second phase coil is suppressed. This further improves the energy efficiency of the electromagnetic pump.

The third disk yoke may be arranged with a gap from the first disk yoke. In this case, the interference between the magnetic flux from the first-phase coil and the magnetic flux from the second-phase coil is further suppressed. This further improves the energy efficiency of the electromagnetic pump.

The first disc yoke may include a plurality of first slits. The first slit may extend outward in the radial direction of the first disk yoke from the first hole. In this case, the magnetic flux fluctuates at positions corresponding to the plurality of slits. Therefore, many eddy currents are generated by the induced current, and the electromagnetic force acting on the conductive liquid is increased. Thereby, the output of the electromagnetic pump can be increased.

The first disc yoke may include a plurality of first teeth and a plurality of first protrusions. The plurality of first teeth may be arranged between the plurality of first slits. The plurality of first teeth may radially extend toward the first hole. The plurality of first protrusions may protrude in the axial direction from each of the plurality of first teeth. In this case, the first projecting portion increases the area of the portion of the first disk yoke that faces the duct. This increases the electromagnetic force acting on the conductive liquid in the duct. Thereby, the output of the electromagnetic pump can be increased.

Each of the plurality of first teeth may have a shape that tapers inward in the radial direction. In this case, the distance between the tips of the plurality of first teeth is increased. Thereby, short-circuiting of the magnetic flux between the adjacent first teeth is suppressed. Further, each of the plurality of first teeth has a width that increases outward in the radial direction. This increases the area of the portion of the first disk yoke that faces the duct.

The second disc yoke may include a plurality of second slits, a plurality of second teeth, and a plurality of second protrusions. The plurality of second slits may extend radially outward from the second hole. The plurality of second teeth may be arranged between the plurality of second slits. The plurality of second teeth may radially extend toward the second holes. The plurality of second protrusions may protrude in the axial direction from each of the plurality of second teeth. The first projecting portion may be displaced from the second projecting portion in the circumferential direction of the first disk yoke. In this case, short-circuiting of the magnetic flux between the first projecting portion and the second projecting portion is suppressed.

The third disc yoke may include a plurality of third slits, a plurality of third teeth, and a plurality of third protrusions. The plurality of third slits may extend radially outward from the third hole. The plurality of third teeth may be arranged between the plurality of third slits. The plurality of third teeth may radially extend toward the third hole. The plurality of third protrusions may protrude in the axial direction from each of the plurality of third teeth. The first projecting portion may be displaced from the third projecting portion in the circumferential direction of the first disc yoke. In this case, the magnetic flux generated by the first phase coil passing through the first protrusion and the magnetic flux generated by the second phase coil passing through the third protrusion are prevented from interfering with each other.

The magnitude of the deviation between the first protrusion and the third protrusion may be 180 electrical degrees. In this case, it is further suppressed that the magnetic flux of the first phase coil passing through the first protrusion and the magnetic flux of the second phase coil passing through the third protrusion interfere with each other.

The third protrusion may protrude in the direction opposite to the first protrusion. In this case, the magnetic flux generated by the first phase coil passing through the first protrusion and the magnetic flux generated by the second phase coil passing through the third protrusion are prevented from interfering with each other.

The electromagnetic pump may further include a first annular yoke. The first annular yoke is made of a magnetic material and may be arranged on the outer periphery of the first phase coil. In this case, the first annular yoke suppresses leakage of magnetic flux from the first phase coil. This further improves the energy efficiency of the electromagnetic pump.

According to the present invention, energy efficiency is improved in an electromagnetic pump.

1 is a perspective view of an electromagnetic pump according to an embodiment; FIG. It is a sectional view of an electromagnetic pump. It is an exploded perspective view of a 1st coil unit. It is a figure which shows the 1st disk yoke seen from the axial direction. FIG. 4 is a cross-sectional perspective view of the first three-phase unit; FIG. 4 is an enlarged perspective view of a part of the first coil unit and the second coil unit; FIG. 4 is a diagram showing wiring of first to sixth coils; It is a perspective view which shows the cross section of the 1st three-phase unit which concerns on a 1st modification. It is a sectional view of the electromagnetic pump concerning the 2nd modification.

An electromagnetic pump according to an embodiment will be described below with reference to the drawings. FIG. 1 is a perspective view of an electromagnetic pump 1 according to an embodiment. FIG. 2 is a cross-sectional view of the electromagnetic pump 1. FIG. An electromagnetic pump 1 is used to transport a conductive liquid such as molten liquid metal. The electromagnetic pump 1 includes a duct 2 , an inner core 3 , a first three-phase unit 4 and a second three-phase unit 5 .

The duct 2 is pipe-shaped and extends in a predetermined axial direction. A conductive liquid flows in the duct 2 . The duct 2 is made of non-magnetic material such as aluminum. The inner core 3 is arranged inside the duct 2 . The inner core 3 is arranged concentrically with the duct 2 . The inner core 3 is made of a magnetic material such as iron. The inner core 3 is cylindrical. The outer diameter of the inner core 3 is smaller than the inner diameter of the duct 2. Therefore, as shown in FIG. 2 , an annular flow path 6 is provided between the inner peripheral surface of the duct 2 and the outer peripheral surface of the inner core 3 .

The first three-phase unit 4 and the second three-phase unit 5 are arranged radially outward of the duct 2 . The first three-phase unit 4 and the second three-phase unit 5 transfer the conductive liquid by applying an electromagnetic force to the conductive liquid in the annular channel 6 . The first three-phase unit 4 and the second three-phase unit 5 are arranged side by side in the axial direction of the duct 2 . First three-phase unit 4 includes first coil unit 11 , second coil unit 12 , and third coil unit 13 . The second three-phase unit 5 includes a fourth coil unit 14 , a fifth coil unit 15 and a sixth coil unit 16 . The first to sixth coil units 11-16 are arranged side by side in the axial direction.

FIG. 3 is an exploded perspective view of the first coil unit 11. FIG. As shown in FIG. 3 , the first coil unit 11 includes a first coil 21 , a first disk yoke 22 , a second disk yoke 23 and a first annular yoke 24 . The first coil 21 , the first disc yoke 22 , the second disc yoke 23 , and the first annular yoke 24 are arranged concentrically with the duct 2 .

The first coil 21 is composed of a wire and is wound around the duct 2 in a circular manner a plurality of times. The first disc yoke 22 has a circular plate shape. The first disc yoke 22 is made of a magnetic material. The first disk yoke 22 is made of, for example, laminated electromagnetic steel sheets or SMC (soft magnetic composite material). The first disk yoke 22 is arranged between the first coil 21 and the second coil unit 12 in the axial direction. The first disk yoke 22 faces the first coil 21 in the axial direction. The first disc yoke 22 includes a first hole 221 . The first hole 221 is positioned at the center of the first disc yoke 22 . The duct 2 is passed through the first hole 221 .

FIG. 4 is a diagram showing the first disk yoke 22 viewed from the axial direction. As shown in FIG. 4 , the first disk yoke 22 includes multiple first slits 222 , multiple first teeth 223 , a first outer peripheral portion 224 , and multiple first protrusions 225 . In the drawing, only some of the plurality of first slits 222 are denoted by reference numerals 222, and the reference numerals 222 are omitted for other first slits 222. As shown in FIG. The same applies to the plurality of first teeth 223 and the plurality of first protrusions 225 .

The first slit 222 extends outward in the radial direction of the first disk yoke 22 from the first hole 221 . The first slit 222 extends from the first hole 221 to the first outer peripheral portion 224 . The first slits 222 radially extend from the first holes 221 . The first teeth 223 are arranged between the first slits 222 respectively. The first teeth 223 are arranged side by side in the circumferential direction of the first disk yoke 22 . In this embodiment, the number of first slits 222 is twenty-four. However, the number of first slits 222 is not limited to 24. The number of first slits 222 may be less than twenty-four or more than twenty-four.

The first teeth 223 radially extend toward the first holes 221 . The first tooth 223 has a tapered shape toward the first hole 221 . The first tooth 223 includes an outer diameter side end portion 226 and an inner diameter side end portion 227 . The width of the outer diameter side end portion 226 is greater than the width of the first slit 222 in the circumferential direction. The width of the inner diameter side end portion 227 is smaller than the width of the first slit 222 in the circumferential direction.

The first outer peripheral portion 224 is positioned radially outward of the first slit 222 and the first tooth 223 . The first outer peripheral portion 224 is connected to the first teeth 223 . The first outer peripheral portion 224 includes the outer peripheral surface of the first disc yoke 22 . The first protruding portion 225 protrudes from the first tooth 223 in the axial direction. The first protrusion 225 protrudes from the first disc yoke 22 toward the first coil 21 . The first projecting portion 225 is positioned radially inward of the first coil 21 . The first projecting portion 225 is positioned between the duct 2 and the first coil 21 in the radial direction. The first projecting portion 225 faces the duct 2 in the radial direction.

FIG. 5 is a cross-sectional perspective view of the first three-phase unit 4 . Note that coils are omitted in FIG. As shown in FIGS. 2 and 5, the second disc yoke 23 is arranged axially apart from the first disc yoke 22 . The second disk yoke 23 is arranged on the side opposite to the first disk yoke 22 with respect to the first coil 21 . In other words, the first coil 21 is arranged between the first disk yoke 22 and the second disk yoke 23 in the axial direction. The second disk yoke 23 faces the first coil 21 in the axial direction.

As shown in FIG. 3 , the second disk yoke 23 includes second holes 231 . The duct 2 is passed through the second hole 231 . The second disc yoke 23 has the same structure as the first disc yoke 22 . The second disc yoke 23 includes a plurality of second slits 232 , a plurality of second teeth 233 , a second outer peripheral portion 234 and a plurality of second protrusions 235 . The second slit 232, the second tooth 233, the second outer peripheral portion 234, and the second protrusion 235 are the first slit 222, the first tooth 223, the first outer peripheral portion 224, and the first protrusion, respectively. It has the same shape as the portion 225 .

FIG. 6 is an enlarged perspective view of a part of the first coil unit 11 and the second coil unit 12. FIG. Note that coils are omitted in FIG. In FIG. 6, a pair of second protrusions 235 adjacent to each other among the plurality of second protrusions 235 are denoted by reference numerals 235A and 235B. As shown in FIG. 6, the first projecting portion 225 is displaced from the second projecting portions 235A and 235B in the circumferential direction of the first disk yoke 22. As shown in FIG. For example, the first protrusion 225 is positioned in the center between a pair of second protrusions 235A and 235B that are adjacent to each other. The second protrusions 235A and 235B are arranged apart from the first protrusion 225 in the axial direction.

The first annular yoke 24 is arranged on the outer circumference of the first coil 21 . The first annular yoke 24 is made of a magnetic material such as SUS403. The first annular yoke 24 covers the first coil 21 from the radially outer side. The first annular yoke 24 is connected to the first disk yoke 22 and the second disk yoke 23 . First annular yoke 24 includes opening 241 . Although not shown, the winding from the first coil 21 is drawn out from the opening 241 . However, the opening 241 may be omitted.

The second coil unit 12 has a structure similar to that of the first coil unit 11 . As shown in FIG. 2, the second coil unit 12 includes a second coil 31, a third disk yoke 32, a fourth disk yoke 33, and a second annular yoke . The second coil 31 is arranged axially apart from the first coil 21 . The second coil 31 has a structure similar to that of the first coil 21 .

The third disk yoke 32 is arranged between the first disk yoke 22 and the second coil 31 in the axial direction. The third disc yoke 32 includes a third hole 321 . The duct 2 is passed through the third hole 321 . The third disc yoke 32 is separate from the first disc yoke 22 . The third disk yoke 32 faces the first disk yoke 22 in the axial direction. The third disc yoke 32 is arranged with a gap G1 with respect to the first disc yoke 22 .

As shown in FIGS. 5 and 6, the third disk yoke 32 includes a plurality of third slits 322, a plurality of third teeth 323, a third outer peripheral portion 324, and a plurality of third protrusions 325. . The third slit 322, the third tooth 323, the third outer peripheral portion 324, and the third projecting portion 325 correspond to the second slit 232, the second tooth 233, the second outer peripheral portion 234, and the second projecting portion, respectively. It has the same shape as the portion 235 .

The third protrusion 325 protrudes in the direction opposite to the first protrusion 225 . That is, the third protrusion 325 protrudes from the third disc yoke 32 toward the second coil 31 . As shown in FIG. 6 , the first projecting portion 225 is displaced from the third projecting portion 325 in the circumferential direction of the first disc yoke 22 . The magnitude of the deviation between the first projection 225 and the third projection 325 is preferably 180 electrical degrees. In this embodiment, the number of teeth of each of the first disk unit and the third disk unit is 24 pieces. Therefore, it is preferable that the magnitude D1 of the deviation between the first protrusion 225 and the third protrusion 325 is 7.5 mechanical degrees. The third disc yoke 32 has the same structure as the second disc yoke 23 .

The fourth disk yoke 33 is arranged between the second coil 31 and the third coil unit 13 in the axial direction. The fourth disc yoke 33 has the same structure as the first disc yoke 22 . The second annular yoke 34 has a structure similar to that of the first annular yoke 24 .

The third coil unit 13 has a structure similar to that of the first coil unit 11 and the second coil unit 12 . As shown in FIG. 2 , the third coil unit 13 includes a third coil 41 , a fifth disk yoke 42 , a sixth disk yoke 43 and a third annular yoke 44 . The third coil 41 is arranged axially apart from the second coil 31 . The third coil 41 has a structure similar to that of the first coil 21 and the second coil 31 .

The fifth disk yoke 42 is arranged between the fourth disk yoke 33 and the third coil 41 in the axial direction. The fifth disc yoke 42 is separate from the fourth disc yoke 33 . The fifth disk yoke 42 faces the fourth disk yoke 33 in the axial direction. The fifth disc yoke 42 is arranged with a gap G2 from the fourth disc yoke 33 . The fifth disc yoke 42 has the same structure as the third disc yoke 32 .

The sixth disk yoke 43 is arranged on the side opposite to the fifth disk yoke 42 with respect to the third coil 41 . The sixth disk yoke 43 is arranged between the third coil 41 and the fourth coil unit 14 in the axial direction. The sixth disc yoke 43 has the same structure as the first disc yoke 22 . The second annular yoke 34 has a structure similar to that of the first annular yoke 24 . The second annular yoke 34 is arranged with a gap G1 from the first annular yoke 24 in the axial direction.

The fourth to sixth coil units 14-16 have structures similar to those of the first to third coil units 11-13, respectively. The first to sixth coil units 11-16 are arranged with a gap therebetween in the axial direction. As shown in FIG. 2, the fourth coil unit 14 includes a fourth coil 51, a seventh disc yoke 52, an eighth disc yoke 53, and a fourth annular yoke . The fifth coil unit 15 includes a fifth coil 61 , a ninth disc yoke 62 , a tenth disc yoke 63 , and a fifth annular yoke 64 . The sixth coil unit 16 includes a sixth coil 71 , an eleventh disc yoke 72 , a twelfth disc yoke 73 , and a sixth annular yoke 74 . The fourth to sixth coils 51, 61, 71 have the same structure as the first coil 21. As shown in FIG. The seventh to twelfth disk yokes 52, 53, 62, 63, 72, 73 have the same structure as the first and second disk yokes 22, 23. The fourth to sixth annular yokes 54 , 64 , 74 have the same structure as the first annular yoke 24 .

FIG. 7 is a diagram showing wiring of the first to sixth coils. As shown in FIG. 7 , a three-phase AC voltage is applied to the first three-phase unit 4 and the second three-phase unit 5 . A fourth coil 51 is connected to the first coil 21 . The fifth coil 61 is connected to the second coil 31 . The sixth coil 71 is connected to the third coil 41 . A U-phase (first phase) voltage is applied to the first coil 21 and the fourth coil 51 . A V-phase (second phase) voltage is applied to the second coil 31 and the fifth coil 61 . A W-phase (third phase) voltage is applied to the third coil 41 and the sixth coil 71 . Thereby, a magnetic field that moves in the axial direction is generated between the inner core 3 and the first to sixth coil units 11-16. In the conductive liquid in the annular flow path 6, an induced current flows according to changes in the magnetic field. As a result, an axial electromagnetic force acts on the conductive liquid, thereby transferring the conductive liquid through the duct 2 . Note that the number of phases of the AC voltage applied to the electromagnetic pump 1 is not limited to three. For example, the number of phases of the AC voltage may be six or nine.

In the electromagnetic pump 1 according to this aspect, each of the coil units 11 to 16 has a disc yoke having a circular plate shape. Therefore, there are few portions where the disk yoke does not exist at the positions facing the coil. Therefore, magnetic flux is generated in a wide range facing the coil. Thereby, the energy efficiency of the electromagnetic pump 1 is improved.

A pair of disc yokes facing each other between the coil units 11-16 are separate from each other. A pair of yokes facing each other are arranged with a gap therebetween. This suppresses the interference of magnetic fluxes by coils of mutually different phases. Thereby, the energy efficiency of the electromagnetic pump 1 is further improved.

Each disk yoke has a plurality of protrusions. Therefore, the area of the portion of the disk yoke that faces the duct 2 increases. Thereby, the electromagnetic force acting on the conductive liquid in the duct 2 is increased. Thereby, the output of the electromagnetic pump 1 can be increased.

In a coil unit having the same phase, protrusions facing each other in the axial direction are offset in the circumferential direction. Thereby, short-circuiting of the magnetic flux between the projections is suppressed.

In the coil units having mutually different phases, the projecting portions facing each other in the axial direction are arranged with a displacement in the circumferential direction. As a result, magnetic flux interference is suppressed in coil units having phases different from each other. In this case, it is preferable that the displacement of the protruding portion is 180 electrical degrees. This further suppresses the interference of magnetic flux.

Each coil unit has an annular yoke. The annular yoke suppresses magnetic flux leakage from the coil. Thereby, the energy efficiency of the electromagnetic pump 1 is further improved.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the invention.

The structure of the disc yoke is not limited to that of the above embodiment, and may be modified. For example, the number or shape of slits and teeth may be changed. In the above embodiments, the number of slits in the disc yoke for each phase is the same. However, the number of slits in the disk yoke of each phase may be different from each other. For example, the number of slits in the disc yoke of the first coil unit 11 may differ from the number of slits in the second coil unit 12 . The number of slits in the disc yoke of the third coil unit 13 may differ from the number of slits in the first coil unit 11 and the number of slits in the second coil unit 12 . The placement of the protrusions may vary. Alternatively, as shown in FIG. 8, the protrusion may be omitted. The shape of the annular yoke may vary.

In the above embodiment, the pair of disc yokes facing each other between the coil units 11-16 are arranged with a gap therebetween. However, instead of or in addition to the gap, a spacer made of non-magnetic material may be arranged between the pair of disk yokes facing each other. For example, as shown in FIG. 9, between the first disk yoke 22 and the third disk yoke 32, a first spacer S1 made of a non-magnetic material may be arranged. A first spacer S1 made of a non-magnetic material may be arranged between the first disc yoke 22 and the third disc yoke 32 . A second spacer S2 made of a non-magnetic material may be arranged between the fourth disc yoke 33 and the fifth disc yoke 42 .

In the above embodiment, the number of coil units is six. However, the number of coil units is not limited to six, and may be less than six or more than six. For example, if the AC voltage is three-phase, the number of coil units may be a multiple of three, such as three, nine, or twelve. If the AC voltage has six phases, the number of coil units may be a multiple of six.

According to the present invention, energy efficiency is improved in an electromagnetic pump.

2 duct 3 inner core 21 first coil 22 first disc yoke 23 second disc yoke 24 first annular yoke 31 second coil 32 third disc yoke 221 first hole 222 first slit 223 first tooth 225 first protrusion 231 Second hole 232 Second slit 233 Second tooth 235 Second protrusion 321 Third hole 322 Third slit 323 Third tooth 325 Third protrusion

Claims (13)

An electromagnetic pump for transferring a conductive liquid, comprising:
a duct extending in a predetermined axial direction through which the conductive liquid flows;
an inner core disposed within the duct;
a first phase coil disposed outside the duct and wound circularly around the duct;
a second phase coil disposed outside the duct and circularly wound around the duct and spaced apart from the first phase coil in the axial direction;
a first disk yoke having a circular plate-like shape, which is disposed between the first phase coil and the second phase coil in the axial direction, includes a first hole through which the duct passes, and
electromagnetic pump.
Further comprising a second disc yoke having a circular plate-like shape, which is disposed on the opposite side of the first disc yoke with respect to the first phase coil, includes a second hole through which the duct is passed,
The electromagnetic pump according to claim 1.
The first disc yoke is disposed between the first disc yoke and the second phase coil in the axial direction, includes a third hole through which the duct passes, and has a circular plate-like shape. further comprising a third disk yoke that is separate from
The electromagnetic pump according to claim 1 or 2.
The third disk yoke is arranged with a gap from the first disk yoke,
The electromagnetic pump according to claim 3.
further comprising a spacer made of a non-magnetic material arranged between the third disc yoke and the first disc yoke;
The electromagnetic pump according to claim 3 or 4.
The first disk yoke includes a plurality of first slits extending outward in a radial direction of the first disk yoke from the first hole,
The electromagnetic pump according to any one of claims 1 to 5.
The first disk yoke is
a plurality of first teeth arranged between the plurality of first slits and extending in the radial direction toward the first hole;
a plurality of first protrusions protruding in the axial direction from each of the plurality of first teeth;
including,
The electromagnetic pump according to claim 6.
the first disk yoke includes a plurality of first teeth arranged between the plurality of first slits and extending in the radial direction toward the first hole;
each of the plurality of first teeth has a shape that tapers inward in the radial direction;
The electromagnetic pump according to claim 6.
The first disk yoke is
a plurality of first slits extending outward in the radial direction of the first disk yoke from the first hole;
a plurality of first teeth arranged between the plurality of first slits and extending in the radial direction toward the first hole;
a plurality of first protrusions protruding in the axial direction from each of the plurality of first teeth;
including
The second disk yoke is
a plurality of second slits extending outward in the radial direction from the second hole;
a plurality of second teeth arranged between the plurality of second slits and extending in the radial direction toward the second hole;
a plurality of second protrusions protruding in the axial direction from each of the plurality of second teeth;
including
The first projecting portion is displaced from the second projecting portion in the circumferential direction of the first disc yoke,
The electromagnetic pump according to claim 2.
The first disk yoke is
a plurality of first slits extending outward in the radial direction of the first disk yoke from the first hole;
a plurality of first teeth arranged between the plurality of first slits and extending in the radial direction toward the first hole;
a plurality of first protrusions protruding in the axial direction from each of the plurality of first teeth;
including
The third disk yoke is
a plurality of third slits extending outward in the radial direction from the third hole;
a plurality of third teeth arranged between the plurality of third slits and extending in the radial direction toward the third hole;
a plurality of third protrusions protruding in the axial direction from each of the plurality of third teeth;
including
wherein the first protrusion is displaced from the third protrusion in the circumferential direction of the first disc yoke,
The electromagnetic pump according to claim 3.
The magnitude of the deviation between the first protrusion and the third protrusion is 180 degrees in electrical angle.
11. Electromagnetic pump according to claim 10.
The third protrusion protrudes in a direction opposite to the first protrusion,
An electromagnetic pump according to any one of claims 9 to 11.
further comprising a first annular yoke arranged on the outer periphery of the first phase coil;
An electromagnetic pump according to any one of claims 1 to 12.

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