KR20210052775A - MAGNETIC DRIVE and PUMP COMPRISING THE SAME - Google Patents

Abstract

The present invention relates to a magnetic drive and a magnetic drive pump. An objective of the present invention to simplify a structure because an internal rotor of the magnetic drive have no magnetic iron cores and to reduce rotational inertia by reducing an outside diameter and a weight. The magnetic drive comprises: an external rotor having an internal space, and including an external magnetic field arranged therein with a plurality of permanent magnets along a circumference of an inner side toward the internal space, and an internal rotor received in the external rotor, having magnetism corresponding to the external magnetic field without a magnetic core functioning as a magnetic path, and to be synchronously rotated with magnetism by rotation of the external rotor. The magnetic drive pump comprises: a magnetic drive including an external rotor having an internal space, and including an external magnetic field arranged therein with a plurality of permanent magnets along a circumference of an inner side toward the internal space, an internal rotor received in the external rotor, having magnetism corresponding to the external magnetic field without a magnetic core functioning as a magnetic path, and to be synchronously rotated with magnetism by rotation of the external rotor, and a power plant coupled with a center of the external rotor to rotate the external rotor, including sharing a rotation axis with the external rotor; and a pump part axially coupled with the internal rotor and including an impeller synchronously rotated by rotation of the internal rotor.

Description

Magnetic drive and pump comprising the same {MAGNETIC DRIVE and PUMP COMPRISING THE SAME}

The present invention relates to a magnetic drive and a pump including the same, and more particularly, to a magnetic drive capable of improving output characteristics by reducing the rotational inertia of the internal rotor of the magnetic drive, and a pump including the same.

In general, a magnetic drive includes an external rotor and an internal rotor housed inside the external rotor. The outer rotor and the inner rotor each have permanent magnets corresponding to each other. In a magnetic drive, the external rotor rotates by receiving rotational force from a power device such as a motor while the inside is sealed, and the internal rotors are synchronized by the magnetic force of the permanent magnets corresponding to each other by the rotating external rotors. Rotate.

The magnetic drive is coupled in a gas tight (gas tight, 氣密) manner, so there is no risk of leakage, and it can be used semi-permanently because there is no friction. Magnetic drives can be used to agitate reactants under high pressure and reduced pressure, and can also be used in contamination-sensitive electronic component materials, bio industry, semiconductor industry, food industry, fine chemical field, and pharmaceutical industry.

A magnetic drive pump is a pump that includes a magnetic drive, and an impeller is coupled to one end of the shaft of an internal rotor equipped with a magnetic drive that rotates according to the magnetic force of a permanent magnet, and it is a pump that sucks and discharges fluid by rotating the impeller. . Magnetic drive pumps are mainly used for applications in which contamination of fluids by general pumps is a problem, and are also used for circulation of high temperature or high pressure fluids.

The internal rotor of a conventional magnetic drive consists of a shaft, a magnetic core surrounding the shaft, and a plurality of divided permanent magnets coupled to the magnetic iron core in which the N poles and the S poles are alternately arranged. The magnetic iron core serves as a magnetic path for the permanent magnet, and the magnetic iron core must exist for the synchronous rotation of the external and internal rotors. Therefore, a thick permanent magnet is required because a large void is generated inside the magnetic drive due to the magnetic iron core. Further, due to the magnetic iron core, an increase in the size and weight of the outer diameter of the inner rotating part including the inner rotor is inevitable, and there is a problem that the starting characteristic is disadvantageous by increasing the rotational inertia of the magnetic drive.

In addition, in the conventional internal rotor, since individual permanent magnets divided into a plurality of pieces are coupled along the circumference of the magnetic iron core, the structure and manufacture of the internal rotor are complicated.

Registered Patent Publication No. 10-1445163 (announced on Oct. 01, 2014)

Accordingly, an object of the present invention is to provide a magnetic drive and a magnetic drive pump in which the structure is simple because there is no magnetic iron core of the magnetic drive internal rotor, and the rotational inertia is reduced by reducing the outer diameter and weight.

In order to achieve the above object, the magnetic drive according to the present invention,

A magnetic core that has an inner space and is accommodated in the outer rotor and an outer rotor provided along the circumference of the inner surface facing the inner space, and an outer magnetic portion in which a plurality of permanent magnets are arranged, and serves as a magnetic path. ), and having an internal magnetic portion having a magnetic force corresponding to the external magnetic portion and having a magnetic path formed therein, and including an internal rotor that rotates synchronously with magnetic force by the rotation of the external rotor.

The internal magnetic part is characterized in that either a permanent magnet arranged in pole anisotropy or a permanent magnet arranged in a Halbach arrangement.

It further includes a power device coupled to the center of the external rotor to rotate the external rotor and having a power shaft that shares a rotation shaft with the external rotor.

The magnetic drive according to the present invention further includes an outer casing portion having both ends open, having an inner space to accommodate the outer rotor, and one end of which is tightly coupled to the power device in tight contact with the power unit.

The magnetic drive according to the present invention further includes an inner casing part that is accommodated in the outer rotor and tightly coupled to the other end surface of the outer casing part.

The inner rotor further includes a drive shaft to which the inner magnetic part is coupled along the periphery, the drive shaft is rotatably coupled to the center of the inner casing, and the rotation shaft of the drive shaft is the power shaft and the outer rotation. It is characterized by being on the same axis as the former.

In order to achieve the above object, the magnetic drive pump according to the present invention has an internal space, and an external magnetic force portion in which a plurality of permanent magnets are arranged is provided along the circumference of the inner surface facing the internal space, and the external An internal rotor that is accommodated in the rotor and has a magnetic force corresponding to the external magnetic portion without a magnetic iron core serving as a magnetic path, and has an internal magnetic portion with a magnetic path formed therein, and rotates synchronously with magnetic force by the rotation of the external rotor. And a magnetic drive including a power device coupled to the center of the external rotor to rotate the external rotor and having a power shaft that shares a rotation shaft with the external rotor, and the internal rotor is axially coupled to the internal rotor. It includes a pump unit having an impeller that rotates synchronously by the rotation of the rotating unit.

The internal magnetic part is characterized in that either a permanent magnet arranged in an anisotropic arrangement or a permanent magnet arranged in a Halbach arrangement.

The magnetic drive further includes an outer casing portion having both ends open, an inner space to accommodate the outer rotor, and one end of which is tightly coupled to the power device in close contact with each other.

The magnetic drive further includes an inner casing part accommodated in the outer rotor and tightly coupled to the other end surface of the outer casing part.

The inner rotor further includes a drive shaft coupled to the inner magnetic portion along the circumference and to which the impeller is axially coupled at one end, and the drive shaft is rotatably coupled to the center of the inner casing, and the drive shaft The rotation shaft is characterized in that the power shaft and the external rotor are on the same axis.

The pump unit accommodates the impeller, has a suction port through which fluid is sucked by rotation of the impeller and an outlet through which the sucked fluid is discharged, and is coupled to be in close contact with at least one of the inner casing part or the outer casing part. It further includes a pump casing for blocking fluid from being introduced into the magnetic drive.

According to the magnetic drive of the present invention, the permanent magnet of the internal magnetic part provided by the internal rotor of the magnetic drive is composed of a polar anisotropic arrangement and a Halbach arrangement in which a magnetic path is formed in the magnet, and a magnetic drive structure without a magnetic iron core is possible. Since the internal rotor according to the present invention does not include a magnetic iron core, the outer diameter, weight and rotational inertia of the magnetic drive are reduced to improve the starting characteristics, and the thickness of the permanent magnet can be increased due to the reduced outer diameter, weight and rotational inertia. The starting characteristics of the drive are further improved. The polar anisotropic and Halbach-arranged permanent magnets provided by the internal magnetic unit provided by the internal rotor according to the present invention can be manufactured with a single magnet in the form of a cylinder or a cylindrical ring instead of a split magnet. The magnetic part is made of a single magnet, so that the reliability of rotation is high, the structure of the internal rotor is simple, and it is easy to manufacture, thus reducing the assembly cost.

According to the magnetic drive pump of the present invention, a pump using a magnetic drive without a magnetic iron core is used by using a permanent magnet provided by an internal rotor of a magnetic drive to form a magnetic path therein. Accordingly, it is possible to provide a pump having improved starting characteristics.

1 is a cross-sectional view of a magnetic drive pump according to the present invention.
2 is a view showing the shape of a magnetic path of a permanent magnet arranged in a linear polar anisotropy.
3 is a cross-sectional view showing a first embodiment of an internal rotor according to the present invention taken along line AA of FIG. 1.
4 is a view showing the shape of a magnetic path of a linear Halbach-arranged permanent magnet.
5 is a cross-sectional view showing a second embodiment of an internal rotor according to the present invention taken along line AA of FIG. 1.

In the following description, it should be noted that only parts necessary for understanding the embodiments of the present invention will be described, and descriptions of other parts will be omitted without distracting the gist of the present invention.

Terms or words used in the present specification and claims described below should not be construed as being limited to a conventional or dictionary meaning, and the inventor is appropriate as a concept of terms in order to describe his own invention in the best way It should be interpreted as a meaning and concept consistent with the technical idea of the present invention on the basis of the principle that it can be defined as such. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention, and various equivalents that can replace them at the time of application It should be understood that there may be variations and variations.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a cross-sectional view of a magnetic drive pump according to the present invention.

Referring to FIG. 1, the magnetic drive pump 100 according to the present invention has an internal space, and an external magnetic part 11 in which a plurality of permanent magnets are arranged is provided along the circumference of the inner surface toward the internal space. It is accommodated in the rotor 10 and the external rotor 10, and has a magnetic force corresponding to the external magnetic portion 11 without a magnetic core serving as a magnetic path. It is provided with an internal magnetic part 21 with a magnetic path formed therein, and is coupled to the center of the internal rotor 20 and the external rotor 10 that rotates synchronously with magnetic force by the rotation of the external rotor 10, and the external rotor The magnetic drive 50 and the internal rotor 20 including a power device 30 having a power shaft 31 that rotates 10 and shares the external rotor 10 and the rotation shaft B. It includes a pump unit 40 having an impeller 41 that is axially coupled and rotates synchronously by the rotation of the internal rotation unit.

That is, the magnetic drive pump 100 according to the present invention includes an external rotor 10 that is rotated by the power device 30 and the power device 30, and an internal rotor 20 that is rotated by the external rotor 10. ) And a pump unit 40 that is coupled to the magnetic drive 50 and sucks and discharges the fluid.

The power device 30 may be a motor operated by an external power source, and includes a power shaft 31 that rotates by an external power source at one end.

The magnetic drive pump 100 according to the present invention may further include an outer casing part 13.

The outer casing part 13 is opened at both ends and accommodates the external rotor 10, and one end of the outer casing part 13 is coupled to the power device 30 in a gas tight manner.

The outer casing part 13 may have a hollow cylindrical shape with open both ends. The outer casing part 13 is coupled to be in close contact with one surface of the power device 30 on which the power shaft 31 is provided, and may be screwed with the power device 30. At one end of the outer casing part 13 and the power unit 30 in contact with each other, a plurality of screw holes into which screws are inserted may be provided along the circumference.

One end of the outer casing part 13 in contact with one side of the power unit 30 may be preferably provided in a shape corresponding to one side of the motor, for example, one side of the power unit 30 in contact with each other and an outer casing part One end of (13) may be circular.

The power shaft 31 passes through one end of the outer casing 13 and is coupled to the center of the external rotor 10. The external rotor 10 may be in the form of a'cup' with an empty space inside and an open end. The external rotor 10 shares the power shaft 31 and the rotation shaft B. Accordingly, the power shaft 31 rotates by an external power source, and the external rotor 10 coupled to the rotating power shaft 31 rotates with the same rotation shaft B.

The external rotor 10 includes an external magnetic portion 11 in which a plurality of permanent magnets are arranged and coupled along the circumference of the inner surface. The plurality of permanent magnets provided by the external magnetic unit 11 may be alternately arranged in N and S poles. The permanent magnets provided in the external magnetic unit 11 may be ferrite, nadyium, samarium, and alnico magnets.

The magnetic drive 50 according to the present invention further includes an inner casing portion 29. The inner casing portion 29 is accommodated in the outer rotor 10. The inner casing portion 29 may be coupled to be in contact with the other end of the outer casing portion 13. Preferably, the inner casing portion 29 is closely coupled to the other end of the outer casing portion 13 and seals the space between the inner casing portion 29 and the power unit 30 in an airtight manner. That is, the inner casing portion 29, the outer casing portion 13, and the power unit 30 are coupled so as to be in close contact with each other so that the inner space and the outer space of the outer casing portion 13 can be kept in an airtight state. .

The magnetic drive 50 according to the present invention includes an inner rotor 20 accommodated in the inner space of the inner casing unit 29.

The internal rotor 20 is manufactured to have a magnetic force corresponding to the external magnetic portion 11 without a magnetic iron core serving as a magnetic path, and a magnetic path is formed therein, and an internal magnetic force part ( 21).

Since the internal magnetic part 21 is manufactured so that a magnetic path is formed therein, the internal rotor 20 having the internal magnetic part 21 is rotated by the external rotor 10 even without a magnetic iron core serving as a conventional magnetic path. It rotates synchronously by magnetic force.

As described above in the background technology of the invention, a magnetic iron core serving as a magnetic path of a permanent magnet is an essential component of a conventional internal rotor. In a conventional internal rotor, a plurality of divided permanent magnets are coupled so that the N pole and the S pole are alternately arranged along the inner circumference of the magnetic iron core so as to be regularly arranged. A magnetic iron core is one of ferromagnetic materials made of ferromagnetic materials or ferromagnetic compounds such as iron or ferrite, and is used to limit the range of a magnetic field in electrical, electric, electronic, or magnetic devices such as transformers, motors, inductors, and self-assembly. Therefore, in the conventional magnetic drive, the weight and volume are increased by the magnetic iron core, and the driving characteristics of the magnetic drive are poor.

However, the internal rotor 20 provided with the internal magnetic force part 21 according to the present invention has a first embodiment and a second embodiment different from the conventional one, and the first and second embodiments are shown in FIGS. 2 to 5 It will be described later with reference to.

The permanent magnet provided in the internal magnetic unit 21 may be composed of ferrite, nadyium, samarium, and alnico magnets.

The internal rotor 20 further includes a drive shaft 27 to which the internal magnetic part 21 is coupled.

One end of the drive shaft (27) is coupled to have a rotation shaft (B) at the center of the inner casing (29), and the internal magnetic force (21) is coupled along the periphery, and the other end rotates together with the drive shaft (27). Thus, the impeller 41 for sucking and discharging the fluid is axially coupled.

The drive shaft 27 is rotated by the internal magnetic portion 21. The rotation shaft B of the drive shaft 27 is coupled to be coaxial with the power shaft 31 and the external rotor 10 described above.

The magnetic drive 50 according to the present invention is an external rotor 10 that rotates by axial coupling with the power shaft 31 of the power device 30 and an internal rotor that rotates by rotation of the external rotor 10 ( 20). The external magnetic part 11 provided by the external rotor 10 and the internal magnetic part 21 provided in the internal rotor 20 are the external magnetic parts 11 which rotate by alternately arranging N and S poles, respectively. The internal magnetic portion 21 having a corresponding magnetic force by) rotates the internal rotor 20.

The magnetic drive pump 100 according to the present invention includes a power device 30, a magnetic drive 50 including an external rotor 10 and an internal rotor 20, and a pump unit 40 as described above. do. The pump unit 40 includes an impeller 41 that is axially coupled to the drive shaft 27 of the inner rotor 20 and rotates synchronously by the rotation of the inner rotor 20.

The pump part 40 has an internal space and includes a pump casing part 43 for accommodating the impeller 41 in the internal space. The pump casing part 43 is connected to at least one of the inner casing part 29 or the outer casing part 13 to prevent contamination of the internal fluid by the outside or, conversely, leakage of the internal fluid and contamination of the outside. It is tightly bonded. Preferably, the pump casing portion 43 is coupled in an airtight manner so as to contact both the inner casing portion 29 and the outer casing portion 13. Therefore, the pump casing part 43, the inner casing part 29, the outer casing part 13, and the power device 30 are airtightly coupled so that the fluid inside the pump casing part 43 is energized with the inner casing part 29. The space between the devices 30, that is, the inner space of the outer casing part 13, is sealed and coupled to prevent inflow.

The pump casing unit 43 includes a suction port 45 through which a fluid is sucked and an outlet 47 through which the fluid is discharged. The impeller 41 rotates together with the internal rotor 20 and sucks the fluid through the inlet 45 by pressure, and then discharges the internal fluid through the outlet 47.

The magnetic drive 50 and the pump 100 including the same according to the present invention are a modification of the conventional internal rotor structure, and the structure of the internal rotor 20 of the magnetic drive 50 according to the present invention is shown in FIG. 2 below. It will be described in more detail with reference to FIG. 5.

[First embodiment]

FIG. 2 is a view showing a shape of a magnetic path of a linear polar anisotropically arranged permanent magnet, and FIG. 3 is a cross-sectional view showing a first embodiment of an internal rotor according to the present invention taken along line A-A of FIG. 1. In FIG. 3, illustration of the inner casing portion 29 and the outer casing portion 13 is omitted to show the structures of the inner rotor 20 and the outer rotor 10 according to the present invention.

Referring to FIG. 2, it can be seen that a magnetic path C through which a magnetic force line passes is formed in the permanent magnet 23 arranged in polar anisotropy. In the pole anisotropically arranged permanent magnet (23), the magnetic field line exits from the N pole and the entry point is from the S pole. The permanent magnet 23 arranged in polar anisotropy is a permanent magnet characterized by magnetizing only in a specific direction. The pole anisotropic arrangement of the permanent magnet 23 is characterized by being pole-separated already at the time of molding. The pole-anisotropically arranged permanent magnet 23 is formed through a process of making a plurality of anisotropic poles by magnetic field molding during the manufacturing process of a sintered magnet or a bonded magnet in advance.

Referring to Figure 3, the first embodiment of the internal rotor 20 according to the present invention is a magnetic path (C) is formed therein as an internal magnetic portion 21, so that an additional magnetic iron core is not required, a permanently arranged polar anisotropy. It includes a magnet (23). In the first embodiment of the inner rotor 20 according to the present invention, the drive shaft 27 is located at the center, and the permanent magnets 23 arranged in polar anisotropy along the circumference of the drive shaft 27 are coupled.

[Second Example]

4 is a view showing a shape of a magnetic path of a linear Halbach-arranged permanent magnet, and FIG. 5 is a cross-sectional view showing a second embodiment of an internal rotor according to the present invention taken along line A-A of FIG. 1. In FIG. 5, illustration of the inner casing portion 29 and the outer casing portion 13 is omitted to show the structures of the inner rotor 20 and the outer rotor 10 according to the present invention.

Referring to Figure 4, the Halbach arrangement of the permanent magnets 25 is a unique arrangement of a series of permanent magnets. The Halbach-arranged permanent magnet 25 has a unique magnetic path C formed therein. The Halbach-arranged permanent magnets 25 have a magnetic path C that rotates spatially, so there is little magnetic field on one side, but improves the magnetic field on the other side. An important advantage of the Halbach-arranged permanent magnet 25 is that it can generate a strong magnetic field on the other surface. In the Halbach-arranged permanent magnets (25), the magnetic field line exits at the N pole and the entrance at the S pole.

Referring to Figure 5, the second embodiment of the internal rotor 20 according to the present invention is the internal magnetic portion 21, a magnetic path (C) is formed inside the Halbach-arranged permanent, which does not require an additional magnetic core. Includes a magnet (25). In the second embodiment of the inner rotor 20 according to the present invention, the drive shaft 27 is located at the center, and the permanent magnets 25 arranged in Halbach along the circumference of the drive shaft 27 are coupled.

[First and second embodiments]

When the first and second embodiments of the inner rotor 20 according to the present invention are summarized, the permanent magnets 23 and 25 arranged in a polar anisotropic arrangement and a Halbach arrangement can be manufactured as a single cylindrical magnet. The polar anisotropic and Halbach arrangement permanent magnets 23 and 25 are manufactured as a single cylindrical permanent magnet rather than a plurality of divided permanent magnets, respectively, and are directly coupled to the drive shaft 27. It is easier to couple the permanent magnets 23 and 25 arranged in polar anisotropic arrangements and Halbach arrangements to the drive shaft 27 compared to the individual permanent magnets coupled to the magnetic iron core. Therefore, it is possible to reduce the assembly cost, and the internal magnetic unit 21 provided in the internal rotor 20 is composed of a single magnet 23 and 25 as a permanent magnet, so that the reliability of rotation can be high.

The permanent magnets 23 and 25 arranged in the polar anisotropic arrangement and the Halbach arrangement do not need to have an additional magnetic iron core because a unique magnetic path C is formed therein. Therefore, since there is no magnetic core, the outer diameter, weight, and rotational inertia of the magnetic drive 50 are reduced to improve the starting characteristics, and the thickness of the magnet can be increased due to the reduced outer diameter, weight, and rotational inertia. The starting characteristics are further improved.

In addition, since there is no need to provide an additional magnetic iron core, it is possible to occupy the volume occupied by the conventional magnetic iron core by the permanent magnets 23 and 25 arranged in an extremely anisotropic arrangement or a Halbach arrangement, thereby increasing the thickness of the permanent magnet. It is possible, and accordingly, the output of the magnetic drive 50 can be improved.

On the other hand, the embodiments disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is obvious to those of ordinary skill in the art that other modifications based on the technical idea of the present invention may be implemented in addition to the embodiments disclosed herein.

10: external rotor
11: External magnetic field
13: outer casing part
20: internal rotor
21: internal magnetic field
23: permanent magnet with polar anisotropic arrangement
25: Halbach-arranged permanent magnet
27: drive shaft
29: inner casing part
30: power unit
31: power shaft
40: pump part
41: impeller
43: pump casing part
45: inlet
47: outlet
50: magnetic drive
100: magnetic drive pump
B: rotating shaft
C: with a ruler

Claims (12)

An external rotor having an internal space, wherein an external magnetic force portion in which a plurality of permanent magnets are arranged is provided along a circumference of an inner surface facing the internal space;
It is accommodated in the external rotor and has an internal magnetic portion having a magnetic force corresponding to the external magnetic portion without a magnetic core serving as a magnetic path, and an internal magnetic portion having a magnetic path formed therein. An internal rotor that rotates synchronously by magnetic force by the rotation of the rotor;
Magnetic drive comprising a. The method of claim 1,
The internal magnetic unit is a magnetic drive, characterized in that any one of pole anisotropic (極異方性) arrangement of permanent magnets or Halbach (halbach) arrangement of permanent magnets. The method of claim 1,
A magnetic drive comprising: a power device coupled to the center of the external rotor to rotate the external rotor and having a power shaft that shares a rotation shaft with the external rotor. The method of claim 3,
The magnetic drive further comprising: an outer casing portion having both ends open and having an inner space to accommodate the outer rotor, and one end of which is tightly coupled to the power device in close contact with each other. The method of claim 4,
The magnetic drive further comprises an inner casing portion accommodated in the outer rotor and tightly coupled to the other end surface of the outer casing portion. The method of claim 5, wherein the inner rotor,
It further includes; a drive shaft to which the internal magnetic portion is coupled along the circumference,
The drive shaft is rotatably coupled to the center of the inner casing, and the rotation shaft of the drive shaft is on the same axis as the power shaft and the external rotor. An external rotor having an internal space and provided with an external magnetic force portion arranged along a circumference of the inner surface facing the internal space,
An internal magnetic portion accommodated in the external rotor and having a magnetic force corresponding to the external magnetic portion without a magnetic core serving as a magnetic path, and an internal magnetic portion having a magnetic path formed therein, and synchronously rotates with magnetic force by the rotation of the external rotor. Rotor, and
A magnetic drive including a power device coupled to the center of the external rotor to rotate the external rotor and having a power shaft sharing a rotation shaft with the external rotor; And
A pump unit axially coupled to the inner rotor and having an impeller synchronously rotated by the rotation of the inner rotor;
Magnetic drive pump comprising a. The method of claim 7,
The internal magnetic unit is a magnetic drive pump, characterized in that any one of pole anisotropic arrangement of permanent magnets or Halbach arrangement of permanent magnets. The method of claim 7, wherein the magnetic drive,
The magnetic drive pump further comprising: an outer casing portion having both ends open, having an inner space to accommodate the outer rotor, and having one end tightly coupled to the power device. The method of claim 9, wherein the magnetic drive,
The magnetic drive pump further comprising: an inner casing portion accommodated in the outer rotor and tightly coupled to the other end surface of the outer casing portion. The method of claim 10, wherein the inner rotor,
It further includes; a drive shaft coupled to the inner magnetic portion along the circumference and the impeller is axially coupled to one end,
The drive shaft is rotatably coupled to the center of the inner casing, and the rotation shaft of the drive shaft is coaxial with the power shaft and the external rotor. The method of claim 10, wherein the pump unit,
It accommodates the impeller, and has an inlet port through which fluid is sucked by rotation of the impeller and an outlet port through which the sucked fluid is discharged, and is coupled so as to be in close contact with at least one of the inner casing part or the outer casing part to the inside of the magnetic drive. A magnetic drive pump, characterized in that it further comprises a; pump casing to block the fluid from being introduced.

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