JP2011041399A - Rotation motor, pump using the rotation motor as drive source, and dish washer, water heater and washing machine, which have pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve low vibration and low noise while preventing scale-up of a rotation motor in the shaft direction. <P>SOLUTION: A circular permanent magnet 3 forming a rotor 5 is radially magnetized so as to generate magnetic flux on both the inner and outer circumferential sides. An inner circumferential stator 7 and an outer circumferential stator 9 for generating rotational force for the permanent magnet 3 are disposed on the inner circumferential side and the outer circumferential side of the permanent magnet 3, respectively. The inner circumferential stator 7 and the outer circumferential stator 9 are equipped with stator cores 8, 10 having claw magnetic poles 8c, 10b oppositely disposed on the inner and outer circumferences of the permanent magnet 3 respectively, and an inside coil 15 and an outside coil 17 which are wound onto the stator cores 8, 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotary motor applicable to various devices, a pump using the rotary motor as a drive source, a dishwasher equipped with the pump, a water heater, and a washing machine.

  There is known a rotary motor having a two-phase structure in which two stators provided with a plurality of pole teeth facing each other are back-to-back so that each pole tooth of each stator has a 90 ° difference in electrical angle. (See Patent Document 1).

JP 2002-359958 A

  By the way, the rotary motor described in Patent Document 1 described above is arranged at an angle that cancels the pulsation of the rotational force by a two-phase structure to reduce vibration and noise. Since the two-layered structure is used, the axial direction becomes large.

  In view of the above, an object of the present invention is to reduce vibration and noise while suppressing an increase in size in the axial direction.

  The invention of claim 1 has an annular permanent magnet constituting the rotor, and the permanent magnet is magnetized so as to generate a magnetic flux on both the inner peripheral side and the outer peripheral side, and the inner peripheral side of the permanent magnet. And an outer peripheral side stator and an outer peripheral side stator for generating a rotational force with respect to the permanent magnet, respectively.

  A second aspect of the present invention is the rotary motor according to the first aspect, wherein the annular permanent magnet is magnetized in a radial direction between an inner peripheral side and an outer peripheral side. .

  A third aspect of the present invention is the rotary motor according to the first aspect, wherein the annular permanent magnet is magnetized in the circumferential direction on both the inner peripheral side and the outer peripheral side. Features.

  A fourth aspect of the present invention is the rotary motor according to any one of the first to third aspects, wherein at least one of the inner peripheral side stator and the outer peripheral side stator is extended in the axial direction. The claw pole type iron core is provided with a plurality of claw magnetic poles that exist and are opposed to the permanent magnet along the circumferential direction.

  A fifth aspect of the present invention is the rotary motor according to any one of the first to third aspects, wherein at least one of the stator cores of the inner peripheral side stator and the outer peripheral side stator is arranged along the circumferential direction. And a slot-wound iron core having a magnetic pole around which a coil is wound.

  A sixth aspect of the present invention is the rotary motor according to any one of the first to fifth aspects, wherein at least one of the inner peripheral side stator and the outer peripheral side stator is laminated with a plurality of steel plates. It is characterized by comprising a laminated iron core.

A seventh aspect of the present invention is the rotary motor according to any one of the first to fifth aspects, wherein at least one of the inner peripheral side stator and the outer peripheral side stator is compressed with magnetic powder. It is characterized by comprising a green compact molded in this way.
The invention according to claim 8 is the rotary motor according to any one of claims 1 to 5, wherein at least one of the stator core of the inner peripheral side stator and the outer peripheral side stator is made of metal glass. It is characterized by that.

  A ninth aspect of the present invention is characterized in that a pump using the rotary motor according to any one of the first to eighth aspects as a drive source is provided.

  A tenth aspect of the present invention is a dishwasher equipped with the pump according to the ninth aspect.

  An eleventh aspect of the invention is a water heater equipped with the pump according to the ninth aspect.

  A twelfth aspect of the present invention is a washing machine equipped with the pump according to the ninth aspect.

  According to the first and third aspects of the present invention, since the inner peripheral side stator and the outer peripheral side stator are arranged on the inner peripheral side and the outer peripheral side of the permanent magnet, respectively, a two-phase structure is provided. Therefore, it is possible to reduce the vibration and noise while achieving a thin profile.

  According to invention of Claim 2, since it is a simple magnetization method, the manufacturing cost of a permanent magnet can be restrained low.

  According to the invention of claim 4, since the coil winding is wound around the annular iron core along the circumferential direction, the manufacturing cost can be kept low.

  According to the invention of claim 5, since the size is generally increased as compared with the claw pole type iron core, the mechanical strength can be maintained high.

  According to the invention of claim 6, eddy current loss can be suppressed to a low level to achieve high efficiency as a motor, and the motor can be miniaturized.

  According to the seventh or eighth aspect of the present invention, it is possible to achieve high efficiency as a motor while suppressing eddy current loss to a low level, and to reduce the size of the motor. In addition, the degree of freedom of shape increases, and manufacture is easy even with a claw pole type iron core.

  According to the ninth aspect of the invention, it is possible to obtain a pump that is reduced in thickness, reduced in vibration, and reduced in noise in the axial direction.

  According to the invention of claim 10, it is possible to obtain a dishwasher with low vibration and low noise while effectively utilizing the shape of the thin pump.

  According to the eleventh aspect of the present invention, it is possible to obtain a water heater with low vibration and low noise while effectively utilizing the shape of the thinned pump.

  According to the twelfth aspect of the present invention, it is possible to obtain a washing machine with low vibration and low noise while effectively utilizing the shape of the thin pump.

It is the front view seen from the axial direction of the rotary motor which shows the 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is sectional drawing of the pump which used the rotary motor of FIG. 1 as a drive source. It is a front view corresponding to FIG. 1 of the rotary motor which shows the 2nd Embodiment of this invention. It is a front view corresponding to FIG. 1 of the rotary motor which shows the 3rd Embodiment of this invention. It is a schematic diagram which shows the internal structure of the dishwasher which mounts the pump of FIG. It is a circuit diagram of the hot water supply unit carrying the pump of FIG. It is a schematic diagram which shows the internal structure of the washing machine carrying the pump of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
A rotary motor 1 shown in FIGS. 1 and 2 is a claw pole type motor, and includes a rotor 5 having a permanent magnet 3 formed in an annular shape (cylindrical shape), and an inner peripheral side stator 7 positioned on the inner peripheral side of the rotor 5. And an outer peripheral side stator 9 located on the outer peripheral side of the rotor 5.

  The rotor 5 has a support plate 11 at one end (right direction in FIG. 2) in the axial direction (left and right direction in FIG. 2) of the permanent magnet 3 and has a generally cup shape. The rotating shaft 13 is connected to the central part of the shaft.

  The inner peripheral side stator 7 has a stator core 8 composed of a dust core as a green compact, and the stator core 8 is arranged at the center of an end plate 8a disposed close to the support plate 11 with the rotary shaft 13 described above. A plurality of claw magnetic poles 8c extending in the same direction and parallel to the shaft portion 8b are provided on the outer peripheral edge of the end plate 8a along the circumferential direction. To be equidistant. An inner coil 15 that is a winding is wound around the space between the shaft portion 8b and the claw magnetic pole 8c.

  On the other hand, the outer peripheral side stator 9 has a stator core 10 composed of a dust core as a green compact, and a plurality of claw magnetic poles 10b are arranged along the circumferential direction inside the outer cylindrical portion 10a located on the outer peripheral side ( The outer cylindrical portion 10a and the claw magnetic pole 10b are connected and integrated with each other by an annular end plate 10c located substantially on the same plane as the above-described end plate 8a. Yes. An outer coil 17 that is a winding is wound around the space between the outer cylindrical portion 10a and the claw magnetic pole 10b.

  The claw magnetic poles 8c of the stator core 8 in the inner peripheral side stator 7 and the claw magnetic poles 10b of the stator core 10 in the outer peripheral side stator 9 are set at positions shifted by 90 degrees in electrical angle.

  The above-described powder iron core is formed by filling a magnetic cavity made of, for example, an amorphous material into a cavity of a mold (not shown) and compressing it. Such a compacted iron core has a structure in which the surface of each iron powder is coated with an inorganic insulating film and the particles are bound with a resin. Iron loss at high frequencies is low (eddy current loss is low), and saturation magnetic flux It has the advantage of high density and excellent heat resistance.

  Here, as shown in FIG. 1, the permanent magnet 3 described above is magnetized in the radial direction between the inner peripheral side and the outer peripheral side at four circumferentially equal intervals, that is, at intervals of 90 degrees. In addition, the magnetization direction (positional relationship between the S pole and the N pole) is different between those adjacent in the circumferential direction. That is, the permanent magnet 3 is magnetized so as to generate a magnetic flux on both the inner peripheral side and the outer peripheral side, and on the inner peripheral side and the outer peripheral side, an inner peripheral that generates a rotational force with respect to the permanent magnet 3. It has a two-phase structure in which the side stator 7 and the outer peripheral side stator 9 are respectively arranged.

  As shown in FIG. 3, in the pump P incorporating the rotary motor 1 as a drive source, an impeller 21 for sucking and discharging liquid is fixedly supported on the support plate 11 shown in FIG. A rotating shaft 13 is attached at the center. The rotary shaft 13 is rotatably supported by a shaft support portion 25 formed inside the pump case 23, and protrudes through the support plate 11 to the side opposite to the impeller 21.

  The impeller 21 described above is rotatably accommodated in a pump chamber 27 formed in the pump case 23. The pump case 23 includes a suction port 29 for sucking liquid into the pump chamber 27 and a discharge port 31 for discharging the liquid in the pump chamber 27, and the pump chamber 27 is formed between the pump case 23 and the separation plate 33. Formed in between.

  The separation plate 33 extends from the outer peripheral side end of the disc portion 33a on the opposite side of the support plate 11 and along the inside of the permanent magnet 3 with the rotary shaft 13 as the center. The inner cylindrical portion 33b, the outer cylindrical portion 33c located outside the permanent magnet 3, and the connecting portion 33d for connecting the ends of the inner cylindrical portion 33b and the outer cylindrical portion 33c opposite to the impeller 21 to each other. And an outer disk part 33e extending radially outward from the end opposite to the connecting part 33d of the outer cylindrical part 33c.

  Here, when the permanent magnet 3 which comprises the rotor 5 rotates between the inner cylindrical part 33b of the above-mentioned separation plate 33 and the permanent magnet 3, and between the outer cylindrical part 33c and the permanent magnet 3, it contacts. The gaps 35 and 37 that are not so large are formed, and a similar gap 39 is also formed between the connecting portion 33 d and the permanent magnet 3. Further, a gap 40 is also formed between the disc portion 33 a and the support plate 11. These gaps 35, 37, 39 and 40 communicate with the pump chamber 27 described above.

  Control boards 41 for controlling the magnetic fields generated by the inner and outer stators 7 and 9 are connected to the inner coil 15 and the outer coil 17 via lead wires 43 and 45, respectively. The entire portion excluding 23 is covered with a mold resin 47. That is, the separation plate 33, the inner peripheral side stator 7 and the outer peripheral side stator 9, and the control substrate 41 are covered with the mold resin 47, thereby ensuring strength.

  In the pump P configured as described above, the magnetic flux generated by energizing the inner coil 15 and the outer coil 17 is transmitted from the claw magnetic poles 8c and 10b to the permanent magnet 3, whereby the permanent magnet 3 is attracted. By repelling, the impeller 21 provided integrally with the rotor 5 rotates together with the rotating shaft 13. As the impeller 21 rotates, a pump action is generated, and the liquid is sucked into the pump chamber 27 from the suction port 29. The liquid pressurized in the pump chamber 27 and pumped in the peripheral direction is discharged from the discharge port. 31 is discharged out of the pump.

  At this time, in the present embodiment, since it is a two-phase drive rotary motor having the inner peripheral side stator 7 and the outer peripheral side stator 9, low vibration and low noise can be achieved. Since the inner peripheral side stator 7 and the outer peripheral side stator 9 provided for the two-phase drive are arranged on the inner peripheral side and the outer peripheral side of the annular permanent magnet 3, respectively, the rotary motor 1 is arranged in the axial direction. Thinning can be achieved while suppressing an increase in size. In addition, the pump P can be thinned by using the thinned rotary motor 1.

  Further, since the permanent magnet 3 of the present embodiment is a simple radial magnetization that is magnetized in the radial direction as a magnetization method, the manufacturing cost can be kept low.

  In the present embodiment, the inner coil 15 and the outer coil 17 are wound around the annular stator cores 8 and 10 along the circumferential direction, that is, claw pole type motors. Can do.

  At this time, in the present embodiment, the stator cores 8 and 10 are made of green compacts formed by compressing magnetic powder, so that high efficiency can be achieved as the rotary motor 1 with low eddy current loss. The size of the rotary motor 1 can be reduced. In addition, since the degree of freedom in shape increases, even a complicated shape that is difficult with a laminated core such as a claw pole type core can be manufactured easily.

[Second Embodiment]
As shown in FIG. 4, the rotary motor 1A of the second embodiment differs from the first embodiment in the method of magnetizing the permanent magnet 3A, and follows the circumferential direction of the annular permanent magnet 3A. It uses polar anisotropic magnetization. That is, in the present embodiment, magnetic poles are generated on both the inner peripheral side and the outer peripheral side by performing anisotropic polar magnetization on both the inner peripheral side and the outer peripheral side of the permanent magnet 3A.

  At this time, the respective magnetized portions on the inner peripheral side and the outer peripheral side are poled anisotropically at four locations at equal intervals in the circumferential direction, that is, at 90 ° intervals, and they are 90 degrees in electrical angle with each other. Degrees are off. For this reason, the claw magnetic poles 8c of the stator core 8 in the inner peripheral side stator 7 of the present embodiment and the claw magnetic poles 10b of the stator core 10 in the outer peripheral side stator 9 are different from those in the first embodiment described above in the circumferential direction. They are in the same position.

  When the magnetized portions on the inner peripheral side and the outer peripheral side of the permanent magnet 3A are set at the same position in the circumferential direction, the claw magnetic pole 8c of the stator core 8 in the inner peripheral side stator 7 and the outer peripheral side stator 9 The claw magnetic pole 10b of the stator core 10 is shifted by 90 degrees in electrical angle as in the first embodiment. Other configurations are the same as those of the first embodiment.

  Also in the second embodiment, as in the first embodiment, the inner peripheral side stator 7 and the outer peripheral side stator 9 are arranged on the inner peripheral side and the outer peripheral side of the permanent magnet 3A, respectively, so that a two-phase structure is provided. In addition, it is possible to achieve low vibration and low noise while achieving reduction in thickness by suppressing enlargement in the axial direction.

  At this time, in the present embodiment, the permanent magnet 3A is poled anisotropically, so that the magnetic force becomes stronger than that of the radially magnetized permanent magnet 3 in the first embodiment, and the rotation motor 1A correspondingly. As a result, further downsizing and higher efficiency can be achieved.

[Third Embodiment]
As shown in FIG. 5, the rotary motor 1B of the third embodiment includes the stator cores 8B and 10B of the inner peripheral side stator 7B and the outer peripheral side stator 9B that are claw pole type in the first and second embodiments. Unlike the iron core, it is a slot wound iron core.

  That is, the stator core 8B of the inner peripheral side stator 7B in the present embodiment has magnetic poles 49 at four equally spaced intervals in the circumferential direction on the outer peripheral side of the cylindrical core portion 47 at the center. A coil 51 is wound around. On the other hand, the stator core 10 </ b> B of the outer stator 9 </ b> B has magnetic poles 55 at four circumferentially equal intervals on the inner side of the outer cylindrical part 53, and a coil 57 is wound around each of the magnetic poles 55.

  Also in the third embodiment, as in the first and second embodiments, the inner peripheral side stator 7B and the outer peripheral side stator 9B are arranged on the inner peripheral side and the outer peripheral side of the permanent magnet 3A, respectively, so that two phases are provided. Due to the structure, it is possible to achieve low vibration and low noise while achieving reduction in thickness by suppressing enlargement in the axial direction.

  At this time, in the third embodiment, the slot cores are used for the stator cores 8B and 10B, and the rotary motor 1B using the slot cores is generally larger than a claw pole type core. Therefore, the mechanical strength can be inevitably maintained high, and the heat dissipation is advantageous.

  In FIG. 5 showing the third embodiment, as in the second embodiment shown in FIG. 4, a permanent magnet 3 </ b> A magnetized anisotropically is used. The same radial magnetized permanent magnet 3 as in the first embodiment shown in FIG. In that case, the magnetic pole 49 of the inner peripheral side stator 7A and the magnetic pole 55 of the outer peripheral side stator 9B are shifted by 90 degrees in electrical angle.

[Fourth Embodiment]
As a fourth embodiment of the present invention, the stator cores 8B and 10B in the third embodiment shown in FIG. 5 are constituted by a laminated core formed by laminating a plurality of steel plates in a direction perpendicular to the paper surface in FIG. Other structures are the same as those described in the third embodiment.

  By configuring the stator cores 8B and 10B with laminated cores, eddy current loss can be suppressed low, and the size and efficiency of the rotary motor can be reduced.

  In the case of a laminated iron core formed by laminating a plurality of steel plates, the slot wound iron core shown in FIG. 5 is suitable, but may be applied to the claw pole type iron core shown in FIG.

[Fifth Embodiment]
As a fifth embodiment of the present invention, the stator cores 8 and 10 in the first and second embodiments and the stator cores 8A and 10A in the third embodiment are made of metal glass. Other structures are the same as those described in the first and second embodiments and the third embodiment.

  Metallic glass has the advantages of low iron loss at high frequencies (low eddy current loss), high saturation magnetic flux density, and excellent heat resistance, similar to the above-described dust core. For this reason, in the fifth embodiment, eddy current loss can be suppressed and it can be used in a high frequency range. Further, similarly to the dust core, it is possible to easily cope with a complicated shape that is difficult with a laminated core such as a claw pole type core.

  Such a metallic glass can also be constituted by a green compact formed by compressing magnetic powder.

[Sixth Embodiment]
In the present embodiment, a pump drive device equipped with a pump P configured using the rotary motor 1 of the present invention as a drive source will be described.

  FIG. 6 shows an example of a dishwasher 100 as a pump drive device according to the present embodiment. In this dishwasher 100, water or hot water is supplied from a water supply port 101 to a water storage tank 102, and the water storage tank 102 is shown. The water or hot water supplied to the water is sent from the water storage tank 102 to the nozzle 103 by the washing pump P1, and the water or the hot water is ejected from the nozzle 103 to wash the tableware 104 arranged in the dishwasher 100.

  In the present embodiment, the washed water or hot water falls downward and is stored in the water storage tank 102, and is sent again to the nozzle 103 by the water purification pump P1. Then, after circulating cleaning for a predetermined time, the water in the water storage tank 102 is drained by stopping the cleaning pump P1 and operating the drain pump P2.

  Next, after supplying water or warm water to the water storage tank 102 again from the water supply port 101, the washing pump P1 is operated for a predetermined time to perform rinsing. Thereafter, the cleaning pump P1 is stopped and the drainage pump P2 is operated to drain the water or hot water in the water storage tank 102. The tableware 104 arranged in the dishwasher 100 is washed by rinsing by repeating the above operation several times.

  Here, in this embodiment, the pump P (refer FIG. 3) which used the rotary motor 1 illustrated in the said 1st Embodiment as a drive source is used for the washing | cleaning pump P1 and the drainage pump P2 which were mentioned above.

  As described above, the cleaning output P1 and the drainage pump P2 are configured by using the pump P using the rotary motor 1 of the present invention as a drive source in the dishwasher 100 according to the present embodiment, thereby improving the drive output of the pump. Thus, it is possible to obtain a dishwasher 100 capable of reducing the thickness of the pump and reducing vibration and noise, and by effectively utilizing the reduced shape of the pump, the storage space for the tableware can be expanded. be able to.

  In this example, the rotary motor used for the pump P is not limited to the rotary motor 1 according to the first embodiment shown in FIG. 1, but the rotary motors according to the second to fifth embodiments may be used. .

  Next, a modification of the pump drive device of this embodiment will be described.

FIG. 7 shows a first modification of the sixth embodiment, and illustrates a case where the pump drive device is a hot water supply unit 200 as a hot water heater. This hot water supply unit 200 is Ecocute (registered trademark) which is a hot water supply system using a heat pump using CO ₂ as a refrigerant, which can reduce power consumption and is friendly to the environment. FIG. 7 shows a schematic diagram of the system. .

  As shown in FIG. 7, the hot water supply unit 200 includes a heat pump unit 201, a hot water storage unit 202, a bath 203, a floor heating 204, a reheating heat exchanger 205, a heating heat exchanger 206, and the like.

  In addition, the hot water supply unit 200 is provided with a hot water faucet 207 for storing a kitchen and a bathroom and an auxiliary tank 208 for accumulating hot water, and a pressure reducing valve 210 is provided downstream of the water supply port 209 and a floor heating 204 is provided. Is provided with a thermally operated valve 211. Further, a plurality of mixing valves 212 and safety valves 213 are provided in each pipe.

  And while driving several pumps P4, P5, P6, P7, P8, and controlling each said valve, water and hot water are sent to hot water faucet 207, etc. for bath 203, a kitchen, or a washroom at desired temperature, It can be supplied at a flow rate.

  Here, in this modification, the pumps P (see FIG. 3) using the rotary motor 1 exemplified in the first embodiment as a drive source are used for the above-described pumps P4 to P8, respectively.

  As described above, the pumps P4 to P8 are configured by using the pump P using the rotary motor 1 of the present invention as a drive source in the hot water supply unit 200 according to this modification, so that the drive output of the pump can be improved. Thus, it is possible to obtain a hot water supply unit 200 that can be reduced in thickness, reduced in vibration, and reduced in noise.

  In this example, the above-described pump P can be applied not only to the hot water supply unit 200 that is an electric water heater using the above-described heat pump but also to a gas water heater or a cogeneration system. Also in this example, the rotary motor used for the pump P is not limited to the rotary motor 1 according to the first embodiment shown in FIG. 1, but the rotary motors according to the second to fifth embodiments may be used. Good.

  FIG. 8 shows a second modification of the sixth embodiment, and illustrates a case where the pump drive device is the washing machine 300.

  In the washing machine 300, the washing tub 301 is rotationally controlled by a motor (not shown), and the washing tub 301 is rotated and water in the washing machine 300 is circulated by the circulation pump P3 to wash clothes and the like. Like to do.

  Here, in this modification, the pump P (see FIG. 3) using the rotary motor 1 exemplified in the first embodiment as a drive source is used as the circulation pump P3 described above. As described above, the circulation pump P3 is configured by using the pump P using the rotary motor 1 of the present invention as a drive source in the washing machine 300 according to the present modification, thereby improving the drive output of the pump and reducing the thickness of the pump. It is possible to obtain a washing machine 300 that can reduce the vibration and noise. Further, the laundry tub 301 can be enlarged by effectively utilizing the shape of the thin pump.

  In this example as well, the rotary motor used in the pump P is not limited to the rotary motor 1 according to the first embodiment shown in FIG. 1, but the rotary motors according to the second to fifth embodiments may be used. Good.

1, 1A, 1B Rotating motor 3, 3A Permanent magnet 5 Rotor 7, 7A, 7B Inner peripheral side stator 8, 8A, 8B Stator core of inner peripheral side stator 8c, 10b Claw magnetic pole 9, 9A, 9B Outer peripheral side stator 10, 10A , 10B Stator core of the outer stator 100 Dishwasher 200 Hot water supply unit (hot water heater)
300 Washing machine P pump

Claims (12)

  An annular permanent magnet constituting the rotor is included, and the permanent magnet is magnetized so as to generate a magnetic flux on both the inner and outer peripheral sides, and the permanent magnet is provided on the inner and outer peripheral sides of the permanent magnet. A rotary motor characterized in that an inner peripheral stator and an outer peripheral stator that generate rotational force with respect to a magnet are arranged.   The rotary motor according to claim 1, wherein the annular permanent magnet is magnetized in a radial direction between an inner peripheral side and an outer peripheral side.   The rotary motor according to claim 1, wherein the annular permanent magnet is magnetized in a circumferential direction on both an inner peripheral side and an outer peripheral side.   The stator core of at least one of the inner circumferential side stator and the outer circumferential side stator is configured by a claw pole type iron core that includes a plurality of claw magnetic poles extending in the axial direction and facing the permanent magnet along the circumferential direction. The rotary motor according to any one of claims 1 to 3, wherein   2. The stator core according to claim 1, wherein at least one of the inner peripheral side stator and the outer peripheral side stator core is formed of a slot wound iron core having a plurality of magnetic poles around which a coil is wound along the circumferential direction. 4. The rotary motor according to any one of items 3 to 3.   The stator core according to any one of claims 1 to 5, wherein at least one stator core of the inner peripheral side stator and the outer peripheral side stator is configured by a laminated core formed by laminating a plurality of steel plates. Rotating motor.   The stator core according to any one of claims 1 to 5, wherein at least one stator core of the inner peripheral side stator and the outer peripheral side stator is configured by a green compact formed by compressing magnetic powder. The described rotary motor.   6. The rotary motor according to claim 1, wherein at least one of the inner peripheral side stator and the outer peripheral side stator is made of metal glass.   A pump comprising the rotary motor according to claim 1 as a drive source.   A dishwasher equipped with the pump according to claim 9.   A water heater equipped with the pump according to claim 9.   A washing machine comprising the pump according to claim 9.

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