JP2001037125A - Magnet motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of a reactive magnetic flux content that does not contribute to the generation of a motor torque and to improve motor efficiency by separating a core into a magnet protection part and a central part and forming the cylindrical outer-periphery surface of a rotor while a central part, a permanent magnet, and the magnet protection part are tightly fixed. SOLUTION: In a magnet motor 10 consisting of a stator 1 and a rotor 2, a core 6 is composed of a central part 6b of the core 6 that is formed by laminating a number of thin magnetic steel plates, and a magnet protection part 6a that is formed by laminating a number of thin magnetic steel plates for protecting a plurality of permanent magnets 7 being mounted to the outer- periphery side of the central part 6b. The outer-periphery surface of the central part 6b is in a shape for adhering to the permanent magnet 7, and the magnet protection part 6a is in a shape for separately adhering to the outer-periphery surface of the permanent magnets 7. Then, while the central part 6b, the permanent magnet 7, and the magnet protection part 6b are fixed, the outer peripheries are integrated to form the cylindrical outer periphery of the rotor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet motor used for a hermetic compressor or the like, and more particularly, to a structure of a rotor of the magnet motor.

[0002]

2. Description of the Related Art A magnet motor of a conventional hermetic compressor will be described with reference to FIGS. FIG. 3A is a longitudinal sectional view of the magnet motor, and FIG. 3B is a transverse sectional view taken along line BB in FIG. In addition, (a) is a vertical cross-sectional view taken along the line AA in (b). FIG. 4 is a partially enlarged cross-sectional view of the rotor shown in FIG.

As shown in FIG. 3, a magnet motor 010 comprises a stator 01 and a rotor 02. The stator 01 is provided on a cylindrical core 03 formed by laminating a large number of thin magnetic steel plates at predetermined intervals in the circumferential direction. A large number of electric wires 05 are wound through a plurality of slots 04 provided at intervals. Here, "magnet motor" means
An electric motor having a permanent magnet on the rotor 02.

The rotor 02 has an iron core 06 formed by laminating a large number of thin magnetic steel plates, and a plurality (four in the present figure) of permanent magnets 07 at predetermined intervals in the circumferential direction of the iron core 06. Is embedded in the iron core so as to face in the circumferential direction.

A rotating shaft 08 is fixed through the center of the iron core 06. At the upper end of the rotor 02, the upper end plate 01
1, a lower end plate 012 is provided at a lower end, and an iron core 06, an upper end plate 011 and a lower end plate 012 are fixed by rivets 013, and a permanent magnet 07 is vertically inserted into the iron core 06.
1 and the lower end plate 012 are applied and fixed.

In the above configuration, as shown in FIG. 4, the surface of the permanent magnet 07 embedded in the rotor 02 corresponding to the outer periphery of the rotor 02 is provided with a magnetic material constituting the iron core 06 in order to protect the permanent magnet 07. The magnet protection part 06a is formed integrally as a part of the steel plate.
In order to form and maintain a, a narrow joint portion 06c integrally connected to the magnet protection portion 06a of the adjacent permanent magnet 07 and the central portion 06b of the iron core 06 was required.

However, the narrow joint portion 06c becomes a short-circuit path for magnetic flux, and has a disadvantage that an ineffective magnetic flux component that does not contribute to the torque generation of the motor is generated.

[0008]

SUMMARY OF THE INVENTION The present invention solves such drawbacks of the conventional magnet motor, reduces the generation of reactive magnetic flux that does not contribute to motor torque generation, and improves the motor efficiency. It is an object to provide

[0009]

Means for Solving the Problems (1) The present invention has been made to solve the above-mentioned problems, and the
The rotor comprises a rotor and a stator. The rotor has a central portion of an iron core in which magnetic plates are stacked in the rotation axis direction of the rotor, and an outer peripheral surface of the central portion has a predetermined shape in a circumferential direction of the rotor. A plurality of permanent magnets closely adhered so that their polarities are directed in the circumferential direction of the rotor at intervals of iron, and an iron fixed separately and closely adhered to the central portion on the outer peripheral surface of each permanent magnet. A magnet protection portion having a core, wherein the central portion, the permanent magnet, and the magnet protection portion are tightly fixed to form a cylindrical outer peripheral surface of the rotor, and a magnet motor is provided. is there.

According to the first means, the iron core is separated into a magnet protection portion and a central portion, and the rotor is structured so as to be tightly fixed to a permanent magnet. A narrow joint for integrally connecting the portion and the central portion is not required, and a short-circuit path of a magnetic flux that generates an ineffective magnetic flux can be eliminated, so that a magnetic flux that does not contribute to torque generation is cut.

(2) As a second means, in the magnet motor described in the first means, the permanent magnet is fixedly adhered to the center portion with an adhesive, and the magnet protection portion is provided on an outer peripheral surface of the permanent magnet. And a magnet motor that is fixedly adhered to the magnet motor with an adhesive.

According to the second means, in addition to the features of the first means, the rotor has a structure in which the iron core is separated into a magnet protection portion and a central portion, and these are fixedly adhered to a permanent magnet with an adhesive. This makes the manufacture of the magnet motor easier.

(3) As a third means, in the magnet motor described in the first means, the permanent magnet is fitted and fixed to each other by fitting a concave and convex portion to the central portion, and the magnet protecting portion is It is another object of the present invention to provide a magnet motor characterized in that the concave and convex portions of the permanent magnet are fitted to and fixed to the outer peripheral surface of the permanent magnet.

According to the third means, in addition to the features of the first means, the rotor has a structure in which the iron core is separated into a magnet protection portion and a central portion, and these are closely fitted and fixed to the permanent magnet by fitting. This makes the manufacture of the magnet motor easier and increases the reliability in strength.

(4) As a fourth means, in the magnet motor described in the second or the third means, between the permanent magnet and the central portion, and between the permanent magnet and the permanent magnet. It is another object of the present invention to provide a magnet motor characterized in that at least one of them is closely fixed by both the close fixing by the adhesive and the close fixing by the fitting. .

According to the fourth means, in addition to the features of the second or third means, the reliability in terms of the strength of the magnet motor can be further improved by performing the close fixing by the adhesive and the close fixing by the fitting together. Get higher.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG.
The magnet motor according to the embodiment will be described. FIG. 3A is a cross-sectional view of the vicinity of the center height of the magnet motor, and FIG. 3B is a partially enlarged cross-sectional view of the rotor section in FIG.

In the magnet motor 10 composed of the stator 1 and the rotor 2 shown in FIG.
b, a large number of thin magnetic steel plates for protecting the central portion 6b of the iron core 6 formed by laminating a large number of thin magnetic steel plates and a plurality of permanent magnets 7 attached to the outer peripheral side of the central portion 6b. The magnet protection section 6a is formed by lamination.

The central portion 6b and the magnet protection portion 6a are not integrally formed as in the conventional example, but are formed separately and independently and separately from each other.
The outer peripheral surface of b has a shape that is in close contact with the permanent magnet 7,
Further, each magnet protection portion 6 a is formed in a shape to be separately and closely attached to the outer peripheral surface of the permanent magnet 7.

A plurality (four in this figure) of permanent magnets 7 are arranged at predetermined intervals in the circumferential direction on the outer peripheral surface of the central portion 6b of the iron core 6 so that the magnetic poles are directed in the circumferential direction. The surfaces of the permanent magnets 7 and the central portion 6b facing each other are adhered and fixed with an adhesive 9b and adhered to each other, and a magnet protective portion 6a formed by laminating a large number of thin magnetic steel plates is formed on the outer peripheral surface of each permanent magnet 7. It is adhered and fixed with an adhesive 9a to be closely attached.

In a state where the central portion 6b, the permanent magnet 7 and the magnet protection portion 6a are fixed, the outer periphery thereof integrally forms the cylindrical outer periphery of the rotor 2, and the iron core 6 to which the permanent magnet 7 is fixed is formed. An upper end plate (not shown) is installed on the upper end surface, and a lower end plate (not shown) is installed on the lower end surface. The upper end plate, the iron core 6, and the lower end plate are fixed and integrated with rivets 13,
A rotating shaft 8 is fixed through the center of the iron core 6 to form the rotor 2.

In the above-described embodiment, the iron core 6 of the magnet motor 10 is separated into a magnet protection portion 6a and a center portion 6b, and these are adhered and fixed to a permanent magnet 7 by a rotor 2. As a result, in addition to cost reduction due to simplification of the structure, a narrow joint portion 06c for integrally connecting the adjacent magnet protection portion 06a and the central portion 06b as in the above-described conventional example becomes unnecessary, and an ineffective magnetic flux is generated. Since the short-circuit path of the magnetic flux that occurs can be eliminated, the magnetic flux that does not contribute to the generation of the torque is cut, and the efficiency of the motor can be improved.

A magnet motor according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a partially enlarged cross-sectional view of the rotor portion, similar to FIG. 1B, showing the first embodiment described above.

As shown in FIG. 2, the iron core 6 of the rotor 2 of the magnet motor 10 has the shape of the central portion 6b and the central portion 6b of the iron core 6 formed by laminating a number of thin magnetic steel plates. The magnet protection portion 6a is formed by laminating a large number of thin magnetic steel plates for protecting the plurality of permanent magnets 7 attached to the outer peripheral side of the portion 6b.

The central portion 6b and the magnet protection portion 6a are not integrally formed as in the conventional example, but are formed separately and independently from each other.
The outer peripheral surface of b has a shape that is in close contact with the permanent magnet 7,
Further, the magnet protection portions 6a are in a shape to be individually closely attached to the outer peripheral surfaces of the respective permanent magnets 7.

A plurality (four in this figure) of permanent magnets 7 are arranged at predetermined intervals in the circumferential direction on the outer peripheral surface of the central portion 6b of the iron core 6 so that the magnetic poles are directed in the circumferential direction. However, on the surface where each of the permanent magnets 7 and the central portion 6b face each other, the convex portion 17 formed on the permanent magnet 7 side is fitted and fixed to the concave portion 19 formed on the central portion 6b side and is brought into close contact therewith.

The magnet protection portion 6a is disposed on the outer peripheral surface of the permanent magnet 7. On the surface where each permanent magnet 7 and the magnet protection portion 6a face each other, the convex portion 16 formed on the magnet protection portion 6a side has a permanent shape. It is fitted and fixed to a concave portion 18 formed on the magnet 7 side and is brought into close contact therewith.

With the central portion 6b, the permanent magnet 7, and the magnet protection portion 6a fixed, the outer periphery thereof integrally forms the cylindrical outer periphery of the rotor 2, and the iron core 6 to which the permanent magnet 7 is fixed. An upper end plate (not shown) is installed on the upper end surface, and a lower end plate (not shown) is installed on the lower end surface. The upper end plate, the iron core 6, and the lower end plate are fixed and integrated with rivets 13,
A rotating shaft 8 is fixed through the center of the iron core 6 to form the rotor 2.

As described above, the magnet motor 10 according to the present embodiment separates the iron core 6 into the magnet protection part 6a and the center part 6b, and separates the center part 6b and the permanent magnet 7 from the center part 6b. The concave portion 19 formed on the side and the convex portion 17 formed on the permanent magnet 7 side
The permanent magnet 7 and the magnet protection section 6
“a” means that the rotor 2 has a structure in which the concave portion 18 formed on the permanent magnet 7 side and the convex portion 16 formed on the magnet protection portion 6a side are fitted and fixed tightly. In addition to improving the reliability of the strength of the rotor 2 by the fitting structure, the narrow joint portion 06c for integrally connecting the adjacent magnet protection portion 06a and the central portion 06b as in the above-described conventional example becomes unnecessary, and is ineffective. Since the short-circuit path of the magnetic flux that generates the magnetic flux can be eliminated, the magnetic flux that does not contribute to the torque generation is cut, and the motor efficiency can be improved.

Further, as a third embodiment of the present invention,
At least one of the portion between the central portion 6b and the permanent magnet 7 and the portion between the permanent magnet 7 and the magnet protection portion 6a may be both fixedly adhered by an adhesive and closely adhered by fitting.
In this case, both characteristics can be exhibited together, and these can be more securely adhered and fixed, and the reliability in strength is further improved.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various changes may be made to the specific structure within the scope of the present invention. Needless to say. Further, the magnet motor of the present invention is not limited to the one used in the hermetic compressor.

[0032]

(1) As described above, according to the first aspect of the present invention, the magnet motor is constituted by the rotor and the stator, and the rotor is formed by stacking magnetic plates in the rotation axis direction of the rotor. A central portion of the iron core, a plurality of permanent magnets closely fixed to the outer peripheral surface of the central portion at predetermined intervals in the circumferential direction of the rotor so that the polarity is directed toward the circumferential direction of the rotor,
The outer peripheral surface of each of the permanent magnets is provided with an iron core magnet protection portion separately and closely fixed to the center portion separately, and the center portion, the permanent magnet and the magnet protection portion are closely fixed. Since the rotor is formed so as to form the cylindrical outer peripheral surface in a state, in addition to the cost reduction due to the simplification of the structure, a narrow joint for integrally connecting the adjacent magnet protective portion and the central portion is unnecessary, and the ineffective magnetic flux Since the short-circuit path of the magnetic flux that generates the component can be eliminated, the magnetic flux that does not contribute to the generation of the torque is cut, and the motor efficiency can be improved.

(2) According to the invention of claim 2, claim 1
2. The magnet motor according to claim 1, wherein the permanent magnet is tightly fixed to the central portion by an adhesive, and the magnet protection portion is tightly fixed to the outer peripheral surface of the permanent magnet by an adhesive. In addition to the effects of the present invention, the rotor having a structure in which the magnet protection portion and the central portion are closely fixed to the permanent magnet with an adhesive makes it easier to manufacture the magnet motor and reduces the manufacturing cost.

(3) According to the invention of claim 3, claim 1
In the magnet motor, the permanent magnet is fitted and fixed in close contact with each other in the central portion, and the magnet protection portion is fitted and fixed in close contact with the uneven portion on the outer peripheral surface of the permanent magnet. In addition to the effect of the first aspect of the present invention, the rotor of the structure in which the iron magnet protection portion and the central portion are closely fixed to the permanent magnet by fitting is provided, so that the magnet motor can be manufactured more easily. It is easier and more reliable in terms of strength, and the manufacturing cost is reduced.

(4) Further, according to the invention of claim 4, in the magnet motor of claim 2 or claim 3, between the permanent magnet and the central portion, and between the permanent magnet and the permanent magnet. Since at least one of them is configured to be closely fixed by both the close fixing by the adhesive and the close fixing by the fitting, in addition to the effect of the invention of claim 2 or 3, the close by the adhesive By performing the fixing and the close contact fixing by fitting together, the reliability of the strength of the magnet motor in terms of strength is further improved.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory views of a magnet motor according to a first embodiment of the present invention, wherein FIG. 1A is a cross-sectional view near the center height of the magnet motor, and FIG. FIG. 4 is a partially enlarged cross-sectional view.

FIG. 2 is an explanatory view of a magnet motor according to a second embodiment of the present invention, and is a partially enlarged transverse sectional view of a rotor unit similar to FIG. 1B.

3A and 3B are explanatory views of a conventional magnet motor, in which FIG. 3A is a longitudinal sectional view of the magnet motor, and FIG. 3B is a transverse sectional view taken along line BB in FIG.

FIG. 4 is a partially enlarged cross-sectional view of the rotor shown in FIG. 3 (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 Rotor 6 Iron core 6a Magnet protection part 6b Central part 7 Permanent magnet 8 Rotating shaft 9a Adhesive 9b Adhesive 10 Magnet motor 13 Rivets 16 Convex part 17 Convex part 18 Concave part 19 Concave part

Claims (4)

[Claims] 1. A rotor comprising: a rotor and a stator, wherein the rotor is provided on a central portion of an iron core in which magnetic plates are stacked in a rotation axis direction of the rotor, and on an outer peripheral surface of the central portion in a circumferential direction of the rotor. A plurality of permanent magnets that are closely fixed so that their polarities are directed in the circumferential direction of the rotor at predetermined intervals, and the central portion is separately fixed to the outer peripheral surface of the permanent magnets separately and in close contact with each other. A magnet motor comprising an iron core magnet protection portion, wherein the central portion, the permanent magnet and the magnet protection portion are tightly fixed to form a cylindrical outer peripheral surface of the rotor. 2. The magnet motor according to claim 1, wherein
A magnet motor, wherein the permanent magnet is fixedly attached to the central portion with an adhesive, and the magnet protection portion is fixedly attached to an outer peripheral surface of the permanent magnet with an adhesive. 3. The magnet motor according to claim 1, wherein
The permanent magnet is tightly fixed by fitting mutual uneven portions to the central portion, and the magnet protection portion is tightly fixed by fitting mutual uneven portions to the outer peripheral surface of the permanent magnet. And a magnet motor. 4. The magnet motor according to claim 2, wherein at least one of the space between the permanent magnet and the central portion and the space between the magnet protection portion and the permanent magnet are adhered by the adhesive. A magnet motor, which is fixedly fixed by both fixing and close fixing by the fitting.