KR101729410B1 - Interior permanent magnet synchronous motor and apparatus for supporting rotor thereof - Google Patents

Interior permanent magnet synchronous motor and apparatus for supporting rotor thereof Download PDF

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Publication number
KR101729410B1
KR101729410B1 KR1020150125541A KR20150125541A KR101729410B1 KR 101729410 B1 KR101729410 B1 KR 101729410B1 KR 1020150125541 A KR1020150125541 A KR 1020150125541A KR 20150125541 A KR20150125541 A KR 20150125541A KR 101729410 B1 KR101729410 B1 KR 101729410B1
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KR
South Korea
Prior art keywords
bars
permanent magnet
rotor
coupled
pole piece
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Application number
KR1020150125541A
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Korean (ko)
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KR20170028656A (en
Inventor
이형우
이주
전현우
안한웅
이기덕
Original Assignee
한양대학교 산학협력단
한국교통대학교산학협력단
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Priority to KR1020150125541A priority Critical patent/KR101729410B1/en
Publication of KR20170028656A publication Critical patent/KR20170028656A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures

Abstract

A permanent magnet embedded type synchronous motor and a rotor supporting device are disclosed. The permanent magnet embedded type synchronous motor includes a rotor rotatably received in a hollow of a stator and a stator, the rotor including a plurality of bars, a plurality of bars, a plurality of bars, A rotor support module including a circular first annular portion coupled to one end of the rotor support module and a circular second annular portion coupled to the other end of the plurality of bars; A plurality of bars which are coupled between the plurality of bars so as to be in close contact with the permanent magnets, and a pair of permanent magnets which are coupled between the plurality of bars so as to be in close contact with one surface of the plurality of bars, And a pole piece.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a permanent magnet embedded type synchronous motor,

The present invention relates to a permanent magnet embedded type synchronous motor and a rotor supporting device therefor.

Permanent magnet synchronous motors generally include a permanent magnet embedded type synchronous motor, a permanent magnet surface mounted synchronous motor, an INSET type permanent magnet synchronous motor, and a SPOKE type permanent magnet synchronous motor. Here, the permanent magnet embedded type synchronous motor and the permanent magnet surface mounted type synchronous motor are most widely used. Particularly, the permanent magnet embedded type synchronous motor is formed by inserting a permanent magnet such as a bar shape, a V shape, or a C shape into a rotor. In addition to the magnetic torque by the permanent magnet, a reluctance torque ) Can be obtained, and it is possible to secure a high output density and to operate in a high-speed region, and it is considered to be most widely used recently.

1 is a schematic illustration of a cross section of a conventional interior permanent magnet synchronous motor (IPMSM).

1, a conventional permanent magnet embedded type synchronous motor includes a hollow stator 10 and a rotor 20 rotatably received in the hollow of the stator 10 in a non-contact manner . Here, the rotor 20 may include at least one magnet embedding hole 21 and a permanent magnet 25 formed in the axial direction of the rotor 20 so that the permanent magnet 25 is embedded. On both sides of the magnet embedding hole 21, a barrier 22 serving as a passage through which magnetic flux flows can be formed as an air layer.

However, the conventional permanent magnet embedded type synchronous motor has a structure for blocking the flow of the magnetic flux around the permanent magnet, and a barrier is formed. Here, there is always a supporting structure called a rib and a web . The ribs and web structure support permanent magnets and pole pieces and are an important part in maintaining the rotor geometry and should be of sufficient width to maintain sufficient mechanical strength when designing with high- do. However, in this case, leakage of the magnetic flux from the permanent magnet occurs through the ribs and the web structure, and there is a problem that effective magnetic flux associated with torque generation is reduced. Therefore, in particular, in the case of a permanent magnet embedding type synchronous motor for high-speed operation, it is difficult to balance between securing sufficient output and efficiency and ensuring mechanical strength.

On the other hand, permanent magnet surface-mounted synchronous motors are also widely used because they are easy to manufacture. However, in the permanent magnet surface-mounted synchronous motor, a scattering prevention tube or the like is inserted on the surface for the purpose of preventing scattering of the permanent magnet during high-speed operation. This increases the width of the magnetic effective gap, There is a problem on the side.

The present invention proposes a permanent magnet embedded type synchronous motor having a rotor for generating a leakage magnetic flux in a rotor and a rotor structure in which a web structure is not formed, and a rotor supporting device therefor.

According to an aspect of the present invention, a permanent magnet embedded type synchronous motor having a stator and a rotor rotatably received in the hollow of the stator is disclosed.

A permanent magnet embedded type synchronous motor according to an embodiment of the present invention includes a stator and a rotor rotatably received in the hollow of the stator, wherein the rotor has a plurality of bars, A rotor supporting module including a bar of a plurality of bars, a circular first annular portion coupled to one end of the plurality of bars, and a circular second annular portion coupled to the other end of the plurality of bars, A permanent magnet coupled between the one side of the plurality of bars and the one side of the rotor core to be in close contact with the one side of the rotor core and the permanent magnet, And a pole piece coupled between the plurality of bars to be in close contact with the permanent magnet.

In order for the pole piece to be slidably engaged with the plurality of bars, a sliding guide protrusion is formed at both ends along the longitudinal direction, and the plurality of bars include a sliding guide groove for guiding the sliding guide projection and receiving the sliding guide projection .

Wherein the rotor supporting module is fabricated in a state where the first and ring portions and the plurality of bars are coupled to each other, and after the rotor core, the permanent magnet, and the pole piece are coupled, And is coupled to the other end of the bar.

The rotor core has a cylindrical shape and is formed in a cylindrical shape having a polygonal cross section so as to be in close contact with an inner surface of the plurality of bars in contact with the rotor core and one surface of the permanent magnet.

After the pole piece is engaged, the outer periphery of the rotor becomes smooth and becomes a perfect cylindrical shape.

The rotor support module prevents leakage of the magnetic flux generated from the permanent magnet.

The rotor support module is formed of a non-magnetic material.

The permanent magnets are formed of neodymium-based magnets containing neodymium (Nd), iron oxide (Fe), and boron (B) as the main components.

According to another aspect of the present invention, a rotor supporting device for a permanent magnet embedded type synchronous motor is disclosed.

A rotor supporting device for a permanent magnet embedded type synchronous motor according to an embodiment of the present invention includes a plurality of bars, a circular first end ring portion coupled to one end of the plurality of bars, Wherein a plurality of bars are formed on the outer circumferential surface of the rotor core so as to be in close contact with one surface of the plurality of bars and one surface of the rotor core, And a pole piece is coupled between the plurality of bars so as to be in close contact with the permanent magnet while covering the permanent magnet.

The permanent magnet embedded type synchronous motor according to the present invention can fundamentally block leakage magnetic flux generation due to the ribs and the web structure of the rotor and thus can reduce the magnetic torque compared to the conventional shape And the reluctance torque due to the pole-piece structure attached to the outer surface of the permanent magnet can be secured in the same manner as the conventional shape, so that the output can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic illustration of a cross-section of a conventional interior permanent magnet synchronous motor (IPMSM). FIG.
FIG. 2 is a perspective view showing a combined state of a rotor having a rotor supporting structure in a permanent magnet embedded type synchronous motor. FIG.
3 is a perspective view of the rotor support module;
4 is a sectional view of a permanent magnet embedded type synchronous motor having a rotor supporting structure.
Fig. 5 is a view showing the flux around the rotor of the conventional permanent magnet embedding type synchronous motor of Fig. 1 and the permanent magnet embedding type synchronous motor having the rotor supporting structure of Fig. 4;

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured. In addition, numerals (e.g., first, second, etc.) used in the description of the present invention are merely an identifier for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate a thorough understanding of the present invention, the same reference numerals are used for the same means regardless of the number of the drawings.

FIG. 2 is a perspective view showing a combined state of a rotor having a rotor supporting structure in a permanent magnet embedded type synchronous motor, and FIG. 3 is a perspective view of a rotor supporting module. Hereinafter, the structure of the rotor of the permanent magnet embedded type synchronous motor having the rotor support structure will be described with reference to FIGS. 2 and 3. FIG.

2, a rotor 100 having a rotor support structure includes a rotor core 110, a rotor support module 120, a permanent magnet 130, and a pole piece 140, .

The rotor support module 120 may be formed in a cylindrical shape such as a general rotor shape as shown in FIG. 3, and may be made of stainless steel, for example, to prevent leakage of magnetic flux generated from the permanent magnet 130. [ And the like.

3, the rotor supporting module 120 includes a plurality of bars 123, a circular first and second ring portion 121 coupled to one end of the plurality of bars 123, and a plurality of bars 123 And a circular second end ring portion 125 coupled to the other end of the second end ring portion 125. For example, the number of bars 123 may be determined by considering the number and size of the permanent magnets 130 applied to the rotor 100, and the interval between the bars 123 may be determined as shown in FIG. 2 And may be formed at an interval corresponding to the width of the permanent magnet 130. [

Of course, the second end ring 125 of the rotor support module 120 is not shown in FIG. 2, but as shown in FIG. 2, the rotor support module 120 first includes a first end ring 121 The permanent magnet 130 and the pole piece 140 are assembled together and then the second ande ring part 125 is assembled with the plurality of bars 123. After assembling the rotor core 110, (Not shown).

Meanwhile, as shown in FIG. 2, the rotor core 110 is mounted in close contact with the inside of the rotor supporting module 120. That is, the rotor core 110 has a tubular shape, such as the shape of the rotor support module 120, and the rotor core 110 of the rotor support module 120, which is in contact with the rotor core 110, And may be formed in a cylindrical shape having a polygonal cross section so as to be in close contact with the inner surface and one surface of the permanent magnet 130.

The permanent magnet 130 is mounted between the plurality of bars 130 so as to be in close contact with one surface of the bar 130 of the rotor supporting module 120 and one surface of the rotor core 110. For example, as shown in FIG. 2, the permanent magnet 130 may have a bar shape having a rectangular cross section and may have a shape of a bar 130 of the rotor support module 120 contacting the permanent magnet 130 The one surface may be formed in the same shape and size as the contact surface of the permanent magnet 130.

For example, the permanent magnet 130 may be formed of a neodymium magnet based on rare earth elements such as neodymium (Nd), iron oxide (Fe), and boron (B). The Neodymium-based magnets have the highest magnetic energy among the permanent magnets 130 existing on the earth, thereby enhancing the driving force of the permanent magnet embedded type synchronous motor.

The pole piece 140 is mounted between the plurality of bars 130 so as to be in close contact with the permanent magnet 130 while covering the permanent magnet 130 after the permanent magnet 130 is mounted.

2, the pole piece 140 is provided with sliding guide projections 141 at both ends thereof along the longitudinal direction so that the pole piece 140 is slidably coupled between the plurality of bars 130 And a sliding guide groove 124 in which the sliding guide protrusion 141 of the pole piece 140 is guided and the sliding guide protrusion 141 is received may be formed in the bar 130 along the longitudinal direction . Accordingly, the pole piece 140 is firmly assembled to prevent breakage of the rotor 100 due to disengagement of the permanent magnet 130 and the pole piece 140 during high-speed operation of the permanent magnet embedded type synchronous motor have.

 The thickness of the pole piece 140 is adjusted such that the pole piece 140 is in contact with the pole piece 140 so that the outer periphery of the rotor 100 becomes smooth after the pole piece 140 is coupled, Can be determined corresponding to the size of the contact surface of the bar 124.

FIG. 4 is a cross-sectional view of a permanent magnet embedded type synchronous motor having a rotor support structure, FIG. 5 is a cross-sectional view of a permanent magnet embedded type synchronous motor having the conventional permanent magnet embedment type synchronous motor of FIG. 1, Fig.

4, a permanent magnet embedded type synchronous motor having a rotor support structure includes a hollow stator 10 and a rotor 100 having a rotor support structure that is rotatably received in the hollow of the stator 10 in a non- ). The rotor 100 having the rotor support structure includes the rotor support module 120, the rotor core 110 assembled by the rotor support module 120, the permanent magnet 130, And a pole piece (140).

Comparing the cross section of the permanent magnet embedded type synchronous motor having the rotor support structure shown in FIG. 4 and the cross section of the conventional permanent magnet embedded type synchronous motor shown in FIG. 1, the permanent magnet embedded type synchronous motor having the rotor support structure Since the rotor core 110, the permanent magnet 130 and the pole piece 140 are in close contact with each other by the rotor supporting module 120 without the space of the rotor 100, A rib and a web structure 27 of the electric motor are not formed.

5 (a) shows a magnetic flux generated around a rib and a web structure 27 of a rotor 20 of a conventional permanent magnet embedded type synchronous motor, and FIG. 5 (b) The magnetic flux generated around the rotor supporting module 120 of the rotor 100 of the permanent magnet embedded type synchronous motor having the rotor supporting structure. The flow of the leakage flux passing through the ribs and the web structure 27 shown in FIG. 5 (a) is greatly reduced in the portion where the rotor supporting module 120 of FIG. 5 (b) .

However, in the structure of the rotor 100 having the rotor support structure according to the embodiment of the present invention, when the cross-sectional area of the motor is too small, the leakage magnetic flux component passes through both ends of the pole piece 140, A clear effect can occur if the cross-sectional area is maintained above the appropriate level.

Table 1 below shows the results of comparison tests between a permanent magnet embedded type synchronous motor having a rotor supporting structure and a conventional permanent magnet embedded type synchronous motor according to an embodiment of the present invention. That is, Table 1 shows the characteristics when the same current (20A_peak) is applied at the rated speed to the conventional permanent magnet embedded type synchronous motor and the permanent magnet embedded type synchronous motor having the rotor supporting structure. The voltage limit value of the example model in Table 1 is 50V_peak, and the current value is 20A_peak.

As shown in Table 1, when comparing the two models, the conventional IPMSM has a reluctance torque of about 9.8%, a magnetic torque of 90.2% The torque was 2.34 Nm. On the other hand, the proposed model has a reluctance torque of 4.7% and magnetic torque of 95.3%, and the total torque is 2.77Nm, which is about 18.4% higher torque than the conventional IPMSM. This is also seen when the difference in d-axis and q-axis inductance changes. In the case of the existing IPMSM, the difference between Lq and Ld was 0.39, but in the case of the proposed model, the difference was reduced to 0.23. The reason for this is that the web and rib structure are replaced with non-magnetic bodies, and Ld and Lq are all decreased when the magnetic field is blocked. In particular, Lq decreased significantly. However, although the specific gravity of the total reluctance torque is slightly reduced, it can be confirmed from the table that the leakage magnetic flux decreases and the magnetic torque increases.

Rated speed (4,000 rpm) Characteristics maximum
torque generated current phase angle
(degE) net.
torque
(Nm) Reluctance torque
(Nm)
(Ratio of total torque) 자기 토크
(Nm)
(Ratio of total torque) L d
(mH) L q
(mH) Existing IPMSM 15 2.34 0.23 (9.8%) 2.10 (90.2%) 1.71 2.10 Suggested model 15 2.77 0.13 (4.7%) 2.65 (95.3%) 0.82 1.05

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

100: rotor
110: rotor core
120: rotor support module
121: first and ring portion
123: multiple bars
125: 2nd and ring part
130: permanent magnet
140: pole piece

Claims (9)

In a permanent magnet embedded type synchronous motor,
Stator; And
And a rotor rotatably received in the hollow of the stator,
The rotor
A rotor supporting module including a plurality of bars, a circular first annular portion coupled to one end of the plurality of bars, and a circular second annular portion coupled to the other end of the plurality of bars;
A rotor core coupled to the inside of the rotor support module so as to be in close contact with an inner surface of the plurality of bars;
A permanent magnet coupled between one surface of the plurality of bars and the plurality of bars so as to be in close contact with one surface of the rotor core; And
And a pole piece covering the permanent magnet and being coupled between the plurality of bars so as to be in close contact with the permanent magnet,
The pole piece is formed with sliding guide projections at both ends along the longitudinal direction so as to be slidingly coupled between the plurality of bars,
Wherein the plurality of bars include a sliding guide groove for guiding the sliding guide projection and receiving the sliding guide projection,
The rotor core has a tubular shape,
A cylindrical shape having a polygonal cross section so as to be in close contact with an inner surface of the plurality of bars in contact with the rotor core and one surface of the permanent magnet,
Wherein the rotor has a smooth cylindrical outer surface after the pole piece is engaged to form a perfect cylindrical shape.
delete The method according to claim 1,
Wherein the rotor supporting module is fabricated in a state where the first and ring portions and the plurality of bars are coupled to each other, and after the rotor core, the permanent magnet, and the pole piece are coupled, And the other end of the bar is coupled to the other end of the bar.
delete delete The method according to claim 1,
Wherein the rotor supporting module prevents leakage of magnetic flux generated from the permanent magnet.
The method according to claim 1,
Wherein the rotor supporting module is formed of a non-magnetic material.
The method according to claim 1,
Wherein the permanent magnet is formed of a neodymium-based magnet including neodymium (Nd), iron oxide (Fe), and boron (B) as rare earth elements.
A rotor supporting device for a permanent magnet embedded type synchronous motor,
A plurality of bars;
A circular first end ring coupled to one end of the plurality of bars; And
And a circular second end ring portion coupled to the other end of the plurality of bars,
A permanent magnet is coupled between the plurality of bars so as to be in close contact with one surface of the plurality of bars and one surface of the rotor core so as to be in close contact with the inner surface of the plurality of bars, And a pole piece is coupled between the plurality of bars so as to be in close contact with the permanent magnet,
The pole piece is formed with sliding guide projections at both ends along the longitudinal direction so as to be slidingly coupled between the plurality of bars,
Wherein the plurality of bars include a sliding guide groove for guiding the sliding guide projection and receiving the sliding guide projection,
The rotor core has a tubular shape,
A cylindrical shape having a polygonal cross section so as to be in close contact with an inner surface of the plurality of bars in contact with the rotor core and one surface of the permanent magnet,
Wherein the rotor has a perfect cylindrical shape after the pole piece is engaged and smooth on the outer circumferential surface thereof.


KR1020150125541A 2015-09-04 2015-09-04 Interior permanent magnet synchronous motor and apparatus for supporting rotor thereof KR101729410B1 (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7056307B2 (en) * 2018-03-28 2022-04-19 日本電産株式会社 motor
KR102180705B1 (en) 2018-12-19 2020-11-20 주식회사 포스코 Variable speed magnetic coupling
KR20220099398A (en) * 2021-01-06 2022-07-13 한국전기연구원 Rotor of synchronous reluctance motor, motor having the same and their manufacturing method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011166952A (en) * 2010-02-10 2011-08-25 Fuji Electric Co Ltd Permanent magnet rotary machine
JP2012115089A (en) * 2010-11-26 2012-06-14 Toyota Motor Corp Rotor for ipm motor and ipm motor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011166952A (en) * 2010-02-10 2011-08-25 Fuji Electric Co Ltd Permanent magnet rotary machine
JP2012115089A (en) * 2010-11-26 2012-06-14 Toyota Motor Corp Rotor for ipm motor and ipm motor

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