JP2001218401A - Permanent magnet synchronous motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce assembly time and improve productivity by enabling easy insertion easy because insertion requires much time since a gap is small when a permanent magnet is inserted in a permanent magnet burying hole, in a permanent magnet buried rotor of a permanent magnet synchronous motor. SOLUTION: A rotor core is formed by laminating rotor iron plates A having a plurality of permanent magnet holes, and laminating one or a plurality of rotor iron plates B having permanent magnet insertion guide holes wider than the permanent magnet holes, on the single side end surface of the laminated rotor iron plates A. As a result, the permanent magnet can be easily inserted so that the assembly time is reduced and the productivity can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric compressor for refrigeration and air conditioning equipment and a permanent magnet synchronous motor used for other general industries.

[0002]

2. Description of the Related Art In recent years, permanent-magnet type synchronous motors used for electric compressors for refrigeration and air-conditioning equipment and for other general industries employ a permanent-magnet embedded rotor in which permanent magnets are embedded in a rotor core. Electric motors have come to be used heavily.

An example of a conventional permanent magnet type synchronous motor rotor is disclosed in Japanese Patent Application Laid-Open No. H11-89140.

Hereinafter, the rotor of the above-described conventional permanent magnet type synchronous motor will be described with reference to FIGS.

FIG. 7 is a partial sectional view in the axial direction of the rotor. FIG. 8 is a side view of the rotor, and FIG. 9 is an enlarged view of the permanent magnet insertion opening 3 on the side of the rotor. 1 in the figure
Is a rotor, 2 is four salient poles, 3 is a permanent magnet insertion opening of a flat permanent magnet burying hole formed with respect to the thickness of the laminated core of the rotor, and 4 is a lower portion of the permanent magnet burying hole. , 5 is a rivet hole, and 6 is a shaft hole.

Here, the gap 3a of the permanent magnet insertion opening 3 has a constant width until the depth reaches the permanent magnet locking portion 4, and is set to a width that allows a flat permanent magnet to be inserted smoothly. I have.

[0007]

However, in the above-mentioned conventional construction, the gap between the permanent magnet and the permanent magnet insertion opening is narrow enough to allow the permanent magnet to be smoothly inserted. There has been a problem that the positioning operation becomes complicated when inserting from the part, and it takes time to assemble the rotor.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems, and has an object to reduce the assembly time of a rotor and improve productivity by adopting a structure in which a permanent magnet can be easily inserted.

[0009]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides a rotor iron core having a plurality of rotor cores A having a plurality of permanent magnet buried holes, and a rotor iron core A having a plurality of stacked rotor cores.
Is formed by laminating one or more rotor iron plates B having a permanent magnet insertion guide hole wider than the magnet embedding hole on one end face of the rotor iron plate B. As a result, when inserting the permanent magnet into the permanent magnet burying hole, the permanent magnet is aligned with the wide permanent magnet insertion guide hole,
The positioning can be easily performed, the permanent magnet can be easily inserted into the rotor core, and the assembling time of the rotor can be shortened to improve the productivity.

Further, according to the present invention, a rotor of a self-starting type permanent magnet type synchronous motor is formed by disposing a starting cage conductor on a rotor core, and a width of the rotor is increased at an end of the rotor core. One or a plurality of rotor iron plates having a wide permanent magnet insertion guide hole are laminated, whereby a permanent magnet can be easily inserted as described above,
A highly productive self-starting permanent magnet synchronous motor can be provided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that a plurality of permanent magnets are embedded in a stator in which windings are wound around a stator core and a rotor core in which iron plates are laminated. A rotor iron plate A in which the rotor core has a permanent magnet burying hole slightly larger than the permanent magnet cross section, and the permanent magnet is provided on one end face of the rotor iron plate A. It is formed by laminating a rotor iron plate B having a permanent magnet guide hole wider than the buried hole, and for inserting the permanent magnet from the wide permanent magnet insertion guide hole when the permanent magnet is buried. In addition, the positioning can be easily performed, the permanent magnet can be easily embedded, and the assembling time of the rotor can be shortened, thereby improving the productivity.

The invention described in claim 2 is the first invention.
In the invention described in (1), a starting cage-shaped conductor is further provided on the rotor core, which has an effect that a self-starting permanent magnet synchronous motor with high productivity can be provided.

[0013] The invention described in claim 3 is the first invention.
Alternatively, according to the second aspect of the present invention, since the permanent magnet is made of a rare earth magnet, a strong magnetic force can be obtained, so that the rotor and the electric motor as a whole can be reduced in size and weight.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a permanent magnet type synchronous motor according to the present invention will be described below with reference to the drawings. Since the stator has the same configuration as a general permanent magnet type synchronous motor, description of the stator will be omitted.

(Embodiment 1) A description will be given with reference to FIGS. FIG. 1 is an axial sectional view of a rotor of a permanent magnet type synchronous motor according to Embodiment 1 of the present invention.

In FIG. 1, 1 is a rotor, 2 is a flat permanent magnet, and 3 is a rotor core. Here rotor core 3
A rotor iron plate A4 having a permanent magnet burying hole 5 laminated thereon, and a rotor iron plate A having a permanent magnet insertion guide hole 7 wider than the permanent magnet burying hole 5 on one end face of the laminated rotor iron plate A. B6 is formed by laminating one or more sheets. Reference numeral 8 denotes a shaft hole of the rotor core 3. Reference numeral 9 denotes a non-magnetic end plate for preventing the permanent magnets 2 attached to both end faces of the rotor core 3 from falling off.

FIG. 2 is a plan view of the rotor iron plate A, and FIG. 3 is a plan view of the rotor iron plate B. 2 and 3, the width P2 of the short side and the width Q2 of the long side of the permanent magnet insertion guide hole 7 are set wider than the respective widths P1 and Q2 of the permanent magnet burying hole 5. The width P1 of the short side of the permanent magnet burying hole 5 is set so that the gap between the permanent magnet 2 and the permanent magnet 2 is made as small as possible without interfering with the assembly, and the permeance coefficient becomes as large as possible.

As can be seen from the figure, the rotor 1 has four magnetic poles.

In the process of assembling the rotor 1 of the permanent magnet type synchronous motor configured as described above, when the permanent magnet 2 is buried in the permanent magnet burying hole 5 of the rotor core 3, the insertion opening of the permanent magnet 2 is inserted. Since the wide permanent magnet insertion guide holes 7 are provided, the work of aligning and inserting the permanent magnets 2 becomes extremely easy, and the assembling time is shortened and the productivity can be improved. .

In the step of punching the rotor iron plate, in order to make holes of different sizes of the permanent magnet burying hole 5 and the permanent magnet insertion guide hole 7, punching is performed sequentially with a tooth mold of each size. The rotor core 3 can be easily formed without impairing productivity.

Although the gap between the permanent magnet insertion guide hole 7 and the permanent magnet 2 is large, the rotor iron plate B having the permanent magnet insertion guide hole 7 has one or more rotor iron plates B at the axial end of the rotor core 3. Since only a plurality of the rotor cores 3 are laminated and the number of the rotor cores 3 is extremely small relative to the total number of the laminated layers, the decrease in the permeance coefficient is negligibly small.

Further, the width of the permanent magnet insertion guide hole 7 can be increased only by making the width P2 of the short side wider than P1.
Is very easy to insert, but the width of expansion of the short side width P2 and the long side width Q2 with respect to the permanent magnet burying hole 5 may be determined while actually checking the insertion state.

(Embodiment 2) A description will be given with reference to FIGS. FIG. 4 is an axial sectional view of a rotor of a permanent magnet type synchronous motor in which a starting cage conductor is provided on a rotor core.

In FIG. 4, 11 is a rotor, 12 is a permanent magnet, and 13 is a rotor core. Here, rotor core 1
3, a rotor iron plate C14 having a permanent magnet burying hole 15 is laminated, and a rotor iron plate D16 having one or a plurality of permanent magnet insertion guide holes 17 is further laminated as in the case of the first embodiment. It is formed by lamination. Reference numeral 18 denotes a shaft hole of the rotor core 13, and reference numeral 19 denotes a non-magnetic end plate.
Reference numeral 20 denotes a conductor bar, which is integrally formed with a short-circuiting ring 21 located at both end surfaces of the rotor core 13 by aluminum die casting to form a starting cage conductor.

FIG. 5 is a plan view of the rotor iron plate C14.
FIG. 6 is a plan view of the rotor iron plate D16. 5 and 6, reference numerals 22 and 23 denote slots for conductor bars, which have the same shape and are arranged at the same position. Here, the width R2 of the short side of the permanent magnet insertion guide hole 17
And the width S2 of the long side is set wider than the respective widths R1 and S1 of the permanent magnet burying hole 15.

In this embodiment, the rotor 11 has four magnetic poles.

In the process of assembling the rotor 11 of the permanent magnet type synchronous motor configured as described above, the permanent magnet 12 is inserted into the permanent magnet burying hole 15 provided in the rotor core 13 as in the first embodiment. In this case, since the insertion opening of the permanent magnet 12 is provided with the wide permanent magnet insertion guide hole 17, the work of aligning and inserting the permanent magnet 12 becomes extremely easy, and the assembling time is shortened. Thus, a highly productive rotor can be obtained.

(Embodiment 3) Although not shown, if the permanent magnet is formed of a rare earth magnet such as a neodymium / iron / boron system, a strong magnetic force can be obtained, so that the rotor and the motor as a whole are reduced in size and weight. be able to.

In all of the above embodiments, the example in which the rotor has four magnetic poles is used. However, the present invention is not limited to this example. Has the same effect.

In all of the above embodiments, the permanent magnets have a flat plate shape. However, the same applies when a permanent magnet having another shape such as an arc shape is used.

[0031]

As described above, according to the first aspect of the present invention, the rotor iron core is formed by laminating the rotor iron plate A having a plurality of permanent magnet buried holes. Is formed by laminating one or more rotor iron plates B having a permanent magnet insertion guide hole wider than the permanent magnet embedding hole, so that the operation of inserting the permanent magnets is facilitated and the rotor Can be shortened, and productivity can be improved.

According to the second aspect of the present invention, in addition to the first aspect of the present invention, by providing a starting cage type conductor on the rotor core, a self-start type permanent magnet having high productivity can be obtained. A magnet type synchronous motor can be provided.

Further, the invention according to claim 3 provides the invention according to claim 1.
Alternatively, the permanent magnet in claim 2 is formed of a rare-earth magnet, and a strong magnetic force is obtained, so that the entire rotor and electric motor can be reduced in size and weight.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a rotor according to a first embodiment of the present invention.

FIG. 2 is a plan view of a rotor iron plate A of the embodiment.

FIG. 3 is a plan view of a rotor iron plate B of the embodiment.

FIG. 4 is an axial sectional view of a rotor according to a second embodiment of the present invention.

FIG. 5 is a plan view of a rotor iron plate C of the embodiment.

FIG. 6 is a plan view of a rotor iron plate D of the embodiment.

FIG. 7 is a partial axial sectional view of a rotor of a conventional permanent magnet type synchronous motor.

FIG. 8 is a side view of a conventional rotor.

FIG. 9 is an enlarged view of a magnet insertion opening on a side surface of a conventional rotor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 2 Permanent magnet 3 Rotor iron core 4 Rotor iron plate A 5 Permanent magnet burying hole 6 Rotor iron plate B 7 Permanent magnet insertion guide hole

Continuation of the front page (72) Inventor Teruo Tamura 4-2-5 Takaida Hondori, Higashiosaka-shi, Osaka Inside Matsushita Refrigerating Machinery Co., Ltd. F term in Sangyo Co., Ltd. (reference) 5H002 AA07 AB07 AC06 AE08 5H619 AA05 BB01 BB24 PP02 PP06 PP08 5H621 AA01 HH01 HH10 JK05 5H622 AA01 CA02 CA07 CA13 CB05 CB06 DD02 PP11 PP12 PP16

Claims (3)

[Claims] A stator having a winding wound around a stator core;
An electric motor comprising a rotor in which a plurality of permanent magnets are embedded in a rotor core in which iron plates are stacked, wherein the rotor core has a permanent magnet embedded hole slightly larger than the permanent magnet cross section. A permanent magnet formed by laminating a rotor iron plate A and a rotor iron plate B having a permanent magnet guide hole wider than the permanent magnet burying hole on one end surface of the rotor iron plate A Type synchronous motor. 2. A permanent magnet type synchronous motor according to claim 1, wherein a starting cage conductor is disposed on the rotor core. 3. The permanent magnet type synchronous motor according to claim 1, wherein the permanent magnet is formed of a rare earth magnet.