JP3301962B2 - Motor rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rotor of an electric motor used for a compressor or the like.

[0002]

2. Description of the Related Art Conventionally, a rotor of a compressor motor of this kind, particularly a rotor of a motor called a brushless DC motor,
For example, it is configured as shown in FIG. 4 (C) of Japanese Patent Application No. 5-138893 filed earlier by the applicant. That is,
In the conventional rotor, a plurality of iron plates for a rotor are laminated and fixed by caulking to form a rotor core, and four (in the case of four poles) magnetic poles are formed along the outer peripheral side of the rotor core. A magnetic material (permanent magnet) is inserted, and the outer peripheral surface of the rotor core is formed with a notch between the magnetic materials to form a salient pole portion, thereby preventing a short circuit of magnetic flux.

Further, a through-hole for caulking and fixing upper and lower non-magnetic end face members and the like is formed in the rotor iron plate of the rotor core, and the end face member and the oil separating oil are separated by using rivets in the through holes. Was fixed to the rotor core by caulking.

On the other hand, as shown in FIG. 15 disclosed in Japanese Patent Application Laid-Open No. 47-27302, a plurality of flat permanent magnets 100 are placed at the center of a rotor 101 such that their magnetic paths are directed tangentially. Are inserted and arranged radially from.

[0005]

However, in the former rotor, since the through hole is formed inside the notch, that is, between the magnetic bodies, when the number of magnetic poles is four or more,
A through hole exists in a magnetic path formed between adjacent magnetic bodies (magnetic poles). For this reason, there has been a problem that the magnetic resistance increases in the through hole and the output of the motor decreases.

In the latter configuration, four insertion holes 1 are provided.
02, four magnets 100 are inserted into the outer periphery of the magnet 100.
It is necessary to provide a protrusion preventing member 103 for preventing 00 from popping out due to centrifugal force, which increases the number of parts and complicates the operation. In addition, since there are four magnets, there is a problem that the magnetic force is limited and desired characteristics cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and not only reduces the adverse effect due to the through-hole for caulking but also reduces the number of parts and facilitates the assembly work. It is an object of the present invention to provide a rotor of an electric motor having characteristics.

[0008]

According to the present invention, there is provided a rotor core in which a plurality of rotor iron plates are laminated, and the rotor core is provided along the axial direction of the rotating shaft. At least two insertion holes, and
In the rotor of the electric motor consisting of a flat permanent magnet and the permanent magnet, a pair of magnets facing between adjacent magnetic poles are disposed substantially in parallel with a predetermined interval across the rotor normal , a pair of the outer circumference side tip and times of magnets forming the pole
The angle (magnetic pole angle) between the trochanter and the center is 55 to 70 degrees.
Eight sheets are inserted into the insertion holes to be in the range of
The iron plates for the child are stacked one on top of the other,
A plurality of through holes penetrating along the rotation axis direction of the core, and a pair of magnetic
Formed between the stone and the air hole formed on the outer peripheral surface corresponding to
Was.

According to a second aspect of the present invention, there is provided a rotor core in which a plurality of rotor iron plates are stacked, and at least two insertion holes provided in the rotor core along the axial direction of the rotation shaft. , In the rotor of the electric motor comprising a flat permanent magnet inserted into these insertion holes, the permanent magnet,
A pair of magnets facing each other between adjacent magnetic poles are arranged substantially in parallel with a predetermined interval across the normal line of the rotor to form a magnetic pole.
Angle between each outer peripheral tip of a pair of magnets and the center of the rotor
Degree (magnetic pole angle) is in the range of 55 to 70 degrees
Eight sheets are inserted into the inlet holes, and correspond to a space between the pair of magnets.
A concave air hole is formed on the outer peripheral surface, and the iron plate for the rotor is
The swaged part should be placed on the rotor core
Between the plurality of through holes penetrating along the direction and the concave air hole
Formed.

According to a third aspect of the present invention, there is provided a rotor core in which a plurality of rotor iron plates are stacked, and at least two insertion holes provided in the rotor core along an axial direction of a rotation shaft. In a rotor of an electric motor comprising a plate-shaped permanent magnet inserted into these insertion holes, the permanent magnet has a predetermined interval between a pair of magnets facing between adjacent magnetic poles with a normal line of the rotor interposed therebetween. Arranged substantially parallel to the rotor iron
End members for closing the insertion holes provided on both end surfaces of the core, and both end members
A plurality of face members and the rotor core penetrate along the rotation axis direction.
A through-hole, and the end face member and the circuit using the through-hole.
A rivet integrally formed with the trochanter core;
Is provided between a pair of magnets facing between adjacent magnetic poles,
An air hole smaller in diameter than the through hole is provided at the center of each magnetic pole.
The ironing plates for the rotor
Formed on the outer peripheral surface corresponding to between the through hole and the pair of magnets
Formed between the air holes.

According to a fourth aspect of the present invention, there are provided a rotor core in which a plurality of rotor iron plates are stacked, and at least two insertion holes provided in the rotor core along an axial direction of a rotation shaft. In a rotor of an electric motor comprising a plate-shaped permanent magnet inserted into these insertion holes, the permanent magnet has a predetermined interval between a pair of magnets opposed between adjacent magnetic poles with a normal line of the rotor interposed therebetween. Arranged substantially in parallel, a concave air hole is formed on the outer peripheral surface corresponding to between the pair of magnets ,
An end face member for closing insertion holes provided on both end faces of the rotor core,
The end face members and the rotor core penetrate along the rotation axis direction.
A plurality of through-holes, and the end face members using the through-holes.
And a rivet integrally forming the rotor core and
The through hole is provided between a pair of magnets facing between adjacent magnetic poles.
In the center of each pole, an air hole smaller in diameter than the through hole
Are provided, and the iron plates for the rotor are
A caulking portion is formed between the through hole and the concave air hole.
Done.

According to a fifth aspect of the present invention, there is provided a rotor core in which a plurality of rotor iron plates are stacked, and at least two insertion holes provided in the rotor core along an axial direction of a rotation shaft. In a rotor of an electric motor comprising a plate-shaped permanent magnet inserted into these insertion holes, the permanent magnet has a predetermined interval between a pair of magnets facing between adjacent magnetic poles with a normal line of the rotor interposed therebetween. Are arranged substantially parallel to each other and
The hole is L-shaped so that the right angle part faces the center of the rotor
And one linear permanent magnet is inserted into each linear part.
And the right angle portion is larger than the width of each straight line portion.
Gaps are formed.

According to a sixth aspect of the present invention, there is provided a rotor core in which a plurality of rotor iron plates are laminated, and at least two insertion holes provided in the rotor core along an axial direction of a rotation shaft. In a rotor of an electric motor comprising a plate-shaped permanent magnet inserted into these insertion holes, the permanent magnet has a predetermined interval between a pair of magnets facing between adjacent magnetic poles with a normal line of the rotor interposed therebetween. Arranged substantially in parallel, a concave air hole is formed on the outer peripheral surface corresponding to between the pair of magnets ,
The insertion hole has an L such that a right angle portion faces the center of the rotor.
It is formed in the shape of a letter, and one straight plate-shaped permanent
While the magnet is inserted, the width of each straight part is
Larger voids are formed.

According to a seventh aspect of the present invention, there is provided a rotor core in which a plurality of rotor iron plates are laminated, and at least two insertion holes provided in the rotor core along an axial direction of a rotating shaft. In a rotor of an electric motor comprising a plate-shaped permanent magnet inserted into these insertion holes, the permanent magnet has a predetermined interval between a pair of magnets facing between adjacent magnetic poles with a normal line of the rotor interposed therebetween. Arranged substantially parallel to the rotor iron
End members for closing the insertion holes provided on both end surfaces of the core, and both end members
A plurality of face members and the rotor core penetrate along the rotation axis direction.
A through hole and a pair of the through holes opposing between adjacent magnetic poles
Are provided between the magnets of
Air holes with a smaller diameter are provided.
The caulking part is a circle passing through a small-diameter air hole and the outer periphery of the rotor.
It was placed on a circle in the middle of the circle.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical sectional side view of a compressor C to which a rotor of an electric motor according to the present invention is applied. In this figure, reference numeral 1 denotes a closed container, and an electric motor (brushless DC)
A motor (2) and a compression element (3) rotatably driven by the electric motor (2) are housed below. The airtight container 1 is obtained by storing the electric motor 2 and the compression element 3 in a preliminarily divided into two parts and then sealing them by high frequency welding or the like.

The electric motor 2 comprises a stator 4 fixed to the inner wall of the closed casing 1 and a rotor 5 rotatably supported inside the stator 4 about a rotation shaft 6. . The stator 4 includes a stator winding 7 that applies a rotating magnetic field to the rotor 5.

The compression element 3 has a first rotary cylinder 9 and a second rotary cylinder 10 partitioned by an intermediate partition plate 8. Eccentric portions 11 and 12 that are driven to rotate by the rotating shaft 6 are attached to the cylinders 9 and 10, respectively. The eccentric portions 11 and 12 are 180 degrees out of phase with each other.

Reference numerals 13 and 14 denote a first roller and a second roller which rotate in the cylinders 9 and 10, respectively, and rotate in the cylinders by rotation of the eccentric portions 11 and 12, respectively. 15,
Reference numeral 16 denotes a first frame and a second frame, respectively. The first frame 15 forms a closed compression space of the cylinder 9 between the first frame 15 and the partition plate 8. A closed compression space of the cylinder 10 is formed between the partition 10 and the partition plate 8. The first frame 15 and the second frame 16 are provided with bearings 17 and 18 that rotatably support the lower part of the rotating shaft 6.

Reference numerals 19 and 20 denote ejection mufflers, which are attached so as to cover the first frame 15 and the second frame 16, respectively. The cylinder 9 and the discharge muffler 19 communicate with each other through a discharge hole (not shown) provided in the first frame 15, and the cylinder 10 and the discharge muffler 20 also communicate with the second frame 1.
6 through a discharge hole (not shown).
Reference numeral 21 denotes a bypass pipe provided outside the sealed container 1 and communicates with the inside of the discharge muffler 20.

Reference numeral 22 denotes a discharge pipe provided on the closed container 1, and reference numerals 23 and 24 denote suction pipes connected to the cylinders 9 and 10, respectively. Reference numeral 25 denotes a sealed terminal for supplying electric power to the stator winding 7 of the stator 4 from outside the sealed container 1 (lead wires connecting the sealed terminal 25 and the stator winding 7 are shown in the drawing). Zu).

FIG. 2 is a plan view of a main part showing a positional relationship between the stator 4 and the rotor 5, FIG. 3 is a plan view of the rotor 5 having a permanent magnet mounted thereon, and FIG. 4 is a plan view of a rotor core. (Before press-fitting permanent magnet).

In each of the figures, reference numeral 26 denotes a rotor core.
A plurality of rotor iron plates 27 punched out from an electromagnetic steel plate having a thickness of 0.3 mm to 0.7 mm into a shape as shown in FIG. 4 are stacked, and are integrally stacked by caulking each other.

The iron plate 27 for the rotor is stamped from an electromagnetic steel plate so as to form magnetic pole portions 28 to 31 constituting four magnetic poles as shown in FIG. At this time, the outer diameter D between the vertices of the magnetic pole portions 28 to 31 is in a range of 30 mm to 70 mm, and is, for example, 50 mm in the embodiment.

Reference numerals 36 to 39 denote four L-shaped insertion holes provided in the rotor core 26 along the axial direction of the rotating shaft 6. Reference numerals 40 to 47 denote eight flat permanent magnets inserted into the insertion holes 36 to 39.

The permanent magnets 40 to 47 are adjacent magnetic poles 2
A pair of magnets 40 to 4 opposed between 8, 29, 30, 31
Reference numerals 7 are arranged substantially parallel to each other with a predetermined interval between the normals of the rotor 5. In addition, concave air holes 32 to 35 are formed on the outer peripheral surface corresponding to the space between the pair of magnets 40 to 47.

Further, the permanent magnets 40 to 47 are
The angle α formed between each of the outer ends A, B of the pair of magnets (for example, 40 and 41) constituting the base 31 and the center O of the rotor 5 is 5
Insert 8 into insertion holes 36-39 so that it is in the range of 5 to 70 degrees.
Have been inserted.

End face members 48, 49 for closing the insertion holes are provided on both end faces of the rotor core 5, and a plurality of through holes 5 penetrating the end face members 48, 49 and the rotor core 26 along the rotation axis direction.
0, and a rivet 51 which integrally forms the end face members 48 and 49 and the rotor core 26 using the through holes. The through holes 50 are provided between a pair of adjacent magnetic poles 28 to 31. It is provided between the magnets 40 to 47.

The insertion holes 36 to 39 are formed in an L-shape such that a right angle portion 52 is opposed to the center O of the rotor 5 when the insertion holes 36 are described. The flat permanent magnets 40 and 41 are inserted, and a gap 55 that is larger than the width of each linear part 53 and 54 is formed in the right angle part 52.

The bridge portion 56 formed at the outer peripheral end of each of the insertion holes 36 to 39 is formed to have a width of 0.3 mm or more and 0.5 mm or less.

The inner diameter of the rotor iron plate 27 at both ends of the rotor core 5 is formed to be slightly larger than the inner diameter of the rotor iron plate 27 at the center.

The rotor 5 has the following formulas (1) and (2) when the outer diameter of the rotor core 26 is D, the lamination thickness is L, the thickness of the magnet is t, and the length of the magnet is l. It is configured to satisfy the following. 0.30 <L / D <1.20 (1) 0.02 <t / l <0.20 (2)

Further, a balance weight 57 having an oil separating function is attached to the upper surface of the end member 48.

In the rotor of the electric motor configured as described above, the permanent magnets 40 to 47 are connected to the adjacent magnetic poles 28, 29,
Since a pair of magnets 40 to 47 facing each other between 30, 31 are arranged substantially in parallel with a predetermined interval across the normal line of the rotor 5, the number of magnets can be effectively arranged in a limited space. The characteristics can be improved, a magnetic path can be secured at the interval, and the reluctance torque can be used effectively. Further, since the magnets 40 to 47 have a flat plate shape, they can be easily formed and have the same shape, so that productivity can be improved and cost reduction can be promoted.

Further, since concave air holes 32 to 35 are formed on the outer peripheral surface corresponding to the space between the pair of magnets 40 to 47, each of the magnets has a magnetic flux leakage generated at the teeth of the stator 4 at the outer peripheral portion. Can be suppressed. That is, if there are no concave air holes 32 to 35, the lines of magnetic force flow too much, iron loss increases, and characteristics deteriorate.

Further, the permanent magnets 40 to 47 are
The angle α formed between each of the outer ends A, B of the pair of magnets (for example, 40 and 41) constituting the base 31 and the center O of the rotor 5 is 5
Insert 8 into insertion holes 36-39 so that it is in the range of 5 to 70 degrees.
Since the sheets are inserted, the angle of the magnetic pole can be optimized, and the magnetic flux can be effectively used.

The through hole 50 into which the rivet 51 is inserted is formed by a pair of magnets 40 to 4 opposed between the adjacent magnetic poles 28 to 31.
7 and is made of a ferromagnetic material,
There is no deterioration in characteristics.

The insertion holes 36 to 39 (for example, 39) are formed in an L-shape such that the right angle portion 52 is opposed to the center O of the rotor 5, and one straight plate is formed in each of the straight portions 53 and 54. The permanent magnets 40 and 41 are inserted, and a gap 55 larger than the width of each linear part 53 and 54 is formed in the right-angled part 52, so that the magnetic flux leaks from the inner ends of the magnets 40 to 47. Can be suppressed. That is, if there is no gap 55, the lines of magnetic force leak when the magnets 40 to 47 are magnetized.

The bridge portion 56 formed at the outer peripheral end of each of the insertion holes 36 to 39 has a length of 0.3 mm or more and 0.5 m or more.
m, the magnetic leakage at the bridge portion 56 can be suppressed.

The inner diameter of the rotor iron plate 27 at both ends of the rotor core 5 is formed slightly larger than the inner diameter of the rotor iron plate 27 at the center. It is possible to suppress a reduction in the inner diameter of the end of the rotor 5 due to a hit.

The rotor 5 has the following formulas (1) and (2) when the outer diameter of the rotor core 26 is D, the lamination thickness is L, the thickness of the magnet is t, and the length of the magnet is l. , The magnets 40 to 47 that are made into common parts are connected to the rotor 5.
Can be incorporated effectively. 0.30 <L / D <1.20 (1) 0.02 <t / l <0.20 (2)

Further, since the balance weight 57 having an oil separating function is attached to the upper surface of the end face member 48, an air gap between the rotor 5 and the stator 4 can be provided without providing a separate separating plate. Oil in the refrigerant that rises can be efficiently separated.

FIGS. 5 to 9 show a rotor according to a second embodiment, which differs from the embodiments shown in FIGS. 2 to 4 in the following point, and the other portions have the same configuration. . That is, as described in claim 6, end face members 48 and 49 for closing the insertion holes 36 to 39 provided on both end faces of the rotor core 26,
A plurality of through holes 50 penetrating the end face members 48, 49 and the rotor core 26 along the rotation axis direction, and the end face members 48, 49 and the rotor core 26 are integrated using the through holes. In the rotor provided with the rivets 51 and the balance weights 57, the through holes 50 are provided between a pair of magnets 40 to 47 facing between adjacent magnetic poles 28 to 31 (for example, between 40 and 47). On the other hand, each magnetic pole 28-
An air hole 60 having a diameter smaller than that of the through hole 50 is provided at the center of the base 31. Therefore, the effect of returning the oil separated by the balance weight 57 downward can be improved.

Numeral 61 denotes a caulking portion for laminating and caulking the iron plates for the rotor, which are formed on the magnetic pole portions 28 to 31. For this reason, it is possible to effectively tighten a portion where the iron plate for the rotor is easily turned up, thereby preventing the iron plate from being turned up.

Moreover, the caulking portion 61 is disposed behind the air hole 60 avoiding the front side of the magnetic pole where the magnetic flux is concentrated, and on the intermediate circle between the circle passing through the four air holes 60 and the outer circumferential circle of the rotor. Therefore, deformation of the outer peripheral portion of the rotor 5 and deformation of the insertion holes 36 to 39 due to the caulking can be prevented.

Of the bridge portions 62 and 63 formed at the outer peripheral end of each of the insertion holes 36 to 39 and facing between the adjacent magnetic poles 28 to 31, the bridge portion 6 in the front in the rotation direction is formed.
3, a notch 64 is formed on the outer peripheral surface.
For this reason, magnetic short circuits at the ends of the magnets 40 to 47 can be prevented.

Further, the rotor 5 has a cutout portion 65 formed on the outer peripheral surface of the magnetic poles 28 to 31 at the front in the rotation direction. For example, in the magnetic pole 28, the outer diameter F in the rotation direction
Is formed shorter than the rear outer diameter E by the cutout 65. For this reason, the air gap between the stator 4 and the rotor 4 is increased, and it is possible to suppress the distortion of the magnetic flux waveform on the front side in the rotation direction due to the armature reaction when the rotor 5 rotates.

FIGS. 10 to 12 show further modifications of the embodiment of FIG. 6, and FIG.
FIG. 11 shows an outer periphery formed so that the bridge portions 62 and 63 project outward in the same shape, and FIG. 12 shows magnetic pole portions 28 to 3.
1 has an outer periphery formed so as to protrude outward in the same shape.

FIG. 13 shows another embodiment in which the cutout portion 65 is formed forward in the rotation direction. In this embodiment, since the cutout 65 is provided near the bridge 63 in the magnetic pole 28, the bridge 63 is formed so as to protrude outward. Therefore, distortion of the magnetic flux waveform on the front side in the rotation direction due to the armature reaction during rotation of the rotor 5 can be suppressed.

A caulking portion 61 is provided at the center of the magnetic poles 28 to 31, and a caulking portion 66 is provided also in a region surrounded by the insertion holes 36 to 39, the concave air holes 32 to 35 and the through hole 50. More firmly fixed. When the caulking portion 66 is also formed on the magnetic pole portion, as shown in FIG. 13, it is preferable to provide the caulking portion at substantially the center of the magnetic pole portion and on the outer peripheral side of the air hole 60 so that all the caulking portions are at substantially equal intervals.

Further, the insertion holes 36 to 39 are provided with locking portions 67 protruding toward the insertion holes at the ends near the center of the rotor so as to stably lock the magnets. . FIG. 1 is an enlarged view of this portion (AA ′ and BB ′ in FIG. 13).
It is shown in FIG.

The rotor 5 configured as described above has a configuration in which a hole 5a formed at the center of the iron plate 27 for the rotor is shrunk on the rotation shaft 6.

The permanent magnet of the above embodiment is made of, for example, a ferrite magnet material or a rare earth magnet material such as a praseodymium magnet or a neodymium magnet.
Its outer shape is rectangular as described above. Further, those obtained by plating the surfaces of these magnet materials with nickel or the like can also be used.

The flat end members 48 and 49 attached to the upper and lower ends of the rotor core 26 are formed of a non-magnetic material such as aluminum or resin material into substantially the same shape as the iron plate 27 for the rotor. I have.

When a direct current is applied to the stator winding 7 of the stator 2, the rotor 5 repels and attracts the magnetic field generated by the permanent magnets 40 to 47.
(E.g., 500 rpm to 1000 rpm by changing the applied voltage)
(Variable in a range of 0 rpm) in the direction of the arrow in FIG. The rotation of the rotor 5 causes the rotation shaft 6 to rotate, which causes the eccentric portions 11 and 12 to rotate.
And the second rollers 13 and 14 rotate, and the compressor exerts a compressing action.

At this time, the state of the magnetic field formed in the rotor core 26 by each of the magnets 40 to 47 is shown in FIG.
FIG. 9 is a plan view of the rotor core 26. At this time, a concentric magnetic field is formed between the adjacent magnets 40 to 47 and the magnetic poles 28 to 31 which are press-fitted into the insertion holes 36 to 39, for example, as shown by a spiral curve in FIG.

In each of the embodiments, the present invention is applied to a rotor having four magnetic poles. However, the present invention is not limited to this, and the present invention is also effective to a rotor of a motor having four or more poles such as eight poles. Further, in the embodiment, the caulking portion 61 uses the iron plate 2 for the rotor.
7 are fixed to each other, but the invention is not limited thereto.
And upper and lower end face members 4 by the rivets 51.
The present invention is also effective for a configuration in which 8, 49 are caulked and fixed to the rotor core 26.

[0057]

As described above in detail, according to the present invention, the permanent magnets are arranged substantially parallel to each other at a predetermined interval with a pair of magnets facing each other between the adjacent magnetic poles with the rotor normal interposed therebetween.
The number of magnets can be effectively arranged in a limited space, the characteristics can be improved, and a magnetic path can be secured at the above-mentioned interval, so that the reluctance torque can be used effectively. Also,
Since the magnet has a flat plate shape, it can be easily formed and all of the same shape can be used, thereby improving productivity and promoting cost reduction.

Further, since a concave air hole is formed on the outer peripheral surface corresponding to the pair of magnets, it is possible to suppress magnetic flux leakage generated at the teeth of the stator at the outer peripheral portion of each magnet.

Further, the permanent magnet is inserted into the insertion hole so that the angle (magnetic local angle) between the outer peripheral end of each of the pair of magnets constituting the magnetic pole and the center of the rotor is in the range of 55 to 70 degrees.
Since the sheets are inserted, the angle of the magnetic pole can be optimized, and the magnetic flux can be effectively used.

The through hole into which the rivet is inserted is provided between a pair of magnets facing between adjacent magnetic poles and is made of a ferromagnetic material, so that the characteristics are not deteriorated.

The insertion hole is formed in an L-shape such that the right-angled portion faces the center of the rotor, and one linear permanent magnet is inserted into each linear portion. Has a gap larger than the width of each straight line,
Leakage of magnetic flux at the inner end of the magnet can be suppressed.

Further, since the caulking portion for laminating and caulking the iron plate for the rotor is formed in the magnetic pole portion, the portion where the iron plate for the rotor is easily turned can be effectively tightened to prevent the iron plate from being turned. Further, by providing the caulked portion between the concave air hole and the through hole, the tightening can be performed more firmly. At this time, the caulked portion formed on the magnetic pole portion is preferably provided at the center of the magnetic pole portion such that all the caulked portions are substantially at equal intervals.

The caulking portion is disposed behind the air hole, avoiding the front side of the magnetic pole where the magnetic flux is concentrated, and on the middle circle between the circle passing through the four air holes and the outer circumference of the rotor. The deformation of the rotor outer peripheral portion and the deformation of the insertion hole due to the processing can be prevented.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a compressor to which the present invention is applied.

FIG. 2 is a plan view showing a rotor and a stator of the present invention.

FIG. 3 is a plan view of the rotor of the present invention.

FIG. 4 is a plan view of a rotor core constituting the rotor of the present invention.

FIG. 5 is a side sectional view of a rotor showing another embodiment of the present invention, and shows a cross section taken along line AA of FIG. 6;

FIG. 6 is a plan view of a rotor showing another embodiment of the present invention.

FIG. 7 is a plan view showing an end member according to another embodiment of the present invention.

FIG. 8 is a plan view showing a balance weight according to another embodiment of the present invention.

FIG. 9 is a plan view showing lines of magnetic force passing through a stator and a rotor according to another embodiment of the present invention.

FIG. 10 is a plan view of a rotor core showing still another embodiment of the present invention.

FIG. 11 is a plan view of a rotor core showing still another embodiment of the present invention.

FIG. 12 is a plan view of a rotor core showing still another embodiment of the present invention.

FIG. 13 is a plan view of a rotor core showing still another embodiment of the present invention.

FIG. 14 is a partially enlarged view of AA ′ and BB ′ of FIG. 13;

FIG. 15 is a plan view of a rotor showing a conventional example.

[Explanation of symbols]

 Reference Signs List 2 motor 4 stator 5 rotor 6 rotating shaft 26 rotor core 27 rotor iron plate 28-31 magnetic pole 32-35 air hole 36-39 insertion hole 40-47 permanent magnet 50 through hole 61 caulking portion

Continuation of the front page (72) Inventor Kazuhiko Arai 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-9-9537 (JP, A) JP-A-9-95 74729 (JP, A) JP-A-8-336250 (JP, A) JP-A-9-23598 (JP, A) JP-A-7-12079 (JP, A) JP-A-6-153427 (JP, A) JP-A-1-144337 (JP, A) JP-A-8-33246 (JP, A) JP-A-11-136912 (JP, A) International publication 92/7409 (WO, A1) (58) Int.Cl. ⁷ , DB name) H02K 1/27 501 H02K 1/27 502 H02K 21/00 H02K 29/00

Claims (7)

(57) [Claims] 1. A rotor core in which a plurality of rotor iron plates are stacked, at least two insertion holes provided in the rotor core along an axial direction of a rotating shaft, and inserted into these insertion holes. in the rotor of the motor consists of a flat plate-like permanent magnet, the permanent magnet, a pair of magnets facing between adjacent magnetic poles are arranged substantially in parallel at predetermined intervals sandwiched normal rotor pole The outer peripheral end of a pair of magnets constituting
From the rotor to the center of the rotor (magnetic pole angle) from 55 degrees
Eight pieces are inserted into the insertion hole so that it is in the range of 70 degrees,
The iron plates for the rotor are stacked on each other
A plurality of through holes penetrating along the rotation axis direction of the
Between the magnets and the air hole formed on the outer peripheral surface corresponding to
A rotor for an electric motor, characterized in that: 2. A rotor core in which a plurality of rotor iron plates are stacked, at least two insertion holes provided in the rotor core along an axial direction of a rotation shaft, and inserted into these insertion holes. in the rotor of the motor consists of a flat plate-like permanent magnet, the permanent magnet, a pair of magnets facing between adjacent magnetic poles are arranged substantially in parallel at predetermined intervals sandwiched normal rotor pole The outer peripheral end of a pair of magnets constituting
From the rotor to the center of the rotor (magnetic pole angle) from 55 degrees
Eight pieces are inserted into the insertion hole so that it is in the range of 70 degrees,
A concave air hole is formed on the outer peripheral surface corresponding to between the pair of magnets.
Caulking section where the iron plates for the rotor
Through the holes along the direction of the rotation axis of the rotor core
And formed between the concave air hole.
Electric motor rotor. 3. A rotor core in which a plurality of rotor iron plates are stacked, at least two insertion holes provided in the rotor core along an axial direction of a rotating shaft, and inserted into these insertion holes. In the rotor of the electric motor consisting of a plate-shaped permanent magnet, the permanent magnet is a pair of magnets facing between adjacent magnetic poles are arranged substantially in parallel with a predetermined interval across the rotor normal , Insert the holes provided on both end faces of the rotor core
Rotate the end member to be closed, and both end members and the rotor core
Using multiple through-holes penetrating along the axial direction and using these through-holes
A rib that integrally forms the end face members and the rotor core.
And the through hole faces between adjacent magnetic poles.
It is provided between a pair of magnets, and the central part of each magnetic pole is penetrated
An air hole with a smaller diameter than the hole is provided, and the iron plates for the rotor
The caulking part is formed by the through hole and the pair of magnets.
Formed between the air holes formed on the outer peripheral surface corresponding to
A rotor for an electric motor, characterized in that: 4. A rotor core in which a plurality of rotor iron plates are stacked, at least two insertion holes provided in the rotor core along an axial direction of a rotating shaft, and inserted into these insertion holes. In a rotor of an electric motor comprising a plate-shaped permanent magnet, a pair of magnets facing each other between adjacent magnetic poles are disposed substantially in parallel with a predetermined interval across a normal line of the rotor. A concave air hole is formed on the outer peripheral surface corresponding to between the magnets, and provided on both end surfaces of the rotor core.
End face member to close the insertion hole, both end face members and rotor core
And a plurality of through holes penetrating along the rotation axis direction,
Using a hole, the end face members and the rotor core are integrated
And a rivet formed between the adjacent magnetic poles.
It is provided between a pair of magnets facing each other, and at the center of each magnetic pole
An air hole smaller in diameter than the through hole is provided,
The caulked portion where the iron plates are stacked one on top of the other
An electric motor formed between the concave air hole
Machine rotor. 5. A rotor core in which a plurality of rotor iron plates are stacked, at least two insertion holes provided in the rotor core along an axial direction of a rotation shaft, and inserted into these insertion holes. In the rotor of the electric motor consisting of a plate-shaped permanent magnet, the permanent magnet is a pair of magnets facing between adjacent magnetic poles are arranged substantially in parallel with a predetermined interval across the rotor normal , The insertion hole has a right angle part at the center of the rotor.
It is formed in an L-shape so as to face each other,
The two flat permanent magnets are inserted, and
Has a gap larger than the width of each straight part
A rotor for a motor. 6. A rotor core in which a plurality of rotor iron plates are stacked, at least two insertion holes provided in the rotor core along an axial direction of a rotation shaft, and inserted into these insertion holes. In a rotor of an electric motor comprising a plate-shaped permanent magnet, a pair of magnets facing each other between adjacent magnetic poles are disposed substantially in parallel with a predetermined interval across a normal line of the rotor. A concave air hole is formed on the outer peripheral surface corresponding to between the magnets, and the insertion hole has a right-angled portion formed by a rotor.
Are formed in an L shape so as to face the center of each straight line.
Each of the flat permanent magnets is inserted into the
At the right angle part, a gap larger than the width of each straight part is formed
A rotor for an electric motor. 7. A rotor core in which a plurality of rotor iron plates are stacked, at least two insertion holes provided in the rotor core along an axial direction of a rotation shaft, and inserted into these insertion holes. In the rotor of the electric motor consisting of a plate-shaped permanent magnet, the permanent magnet is a pair of magnets facing between adjacent magnetic poles are arranged substantially in parallel with a predetermined interval across the rotor normal , Insert the holes provided on both end faces of the rotor core
Rotate the end member to be closed, and both end members and the rotor core
A plurality of through holes penetrating along the axial direction, and this through hole is adjacent
Each magnetic pole is provided between a pair of magnets facing each other between the matching magnetic poles.
An air hole smaller in diameter than the through hole is provided at the center of
The trochanter steel plates are stacked one on top of the other,
Arranged on a circle between the circle passing through the wind hole and the outer circumference of the rotor
A rotor for an electric motor, characterized in that: