TW201332255A - Magnet-embedded type rotor - Google Patents

Abstract

A magnet-embedded type rotor has a rotor core 1 formed by stacking steel plates and formed with a cylindrical shape, and having a plurality of rectangular magnet-embedding holes 1b arranged with a predetermined interval in a ring shape in a peripheral portion, and a magnet holding frame 2 including a traversal frame 2a provided with a caulking portion 2f, two longitudinal frames 2b having one ends connected to the two ends of the traversal frame 2a and arranged in parallel with each other such that an inner width Hc thereof is the same as the traversal width Hd of a rectangular plate-like permanent magnet 3 and an outer width Hg is the same as the circumferential width Ha of the magnet-embedding hole 1b, and a head frame 2c connected to the other ends of the two longitudinal frames 2b, the magnet holding frame 2 being embedded into the magnet-embedding hole 1b with the permanent magnet 3 being held between the two longitudinal frames 2b, and the caulking portion 2f o the traversal frame 2a being caulked so as to fix the magnet holding frame 2 in the rotor core 1 and integrate the magnet holding frame 2 with the rotor core 1.

Description

Magnet embedded rotor

The present invention relates to a magnet-embedded rotor in which a permanent magnet is embedded in a rotor core.

Conventionally, a rotor for an electric compressor has been disclosed in which a rotor plate is disposed on both end faces of a core, and a plurality of rivets are passed through the end plates and the core to fix the rotor of the electric compressor. The head or caulking portion of the at least one rivet is formed to be larger than the other rivets, and the head or the rivet portion formed as a larger rivet is balanced and uniform in weight, and the rotation of the electric compressor is eliminated. The unbalanced balance weight functions (for example, refer to Patent Document 1).

Further, a permanent magnet rotating machine including a stator and a rotor, wherein the rotor is a laminated core composed of a plurality of electromagnetic steel sheets in the axial direction, and a rotor shaft hole is provided in the axial direction of the laminated core, The plurality of magnet receiving holes for accommodating the permanent magnets and the plurality of riveting pin holes for inserting the caulking pins are provided in the radial direction of the rotor shaft holes, and are at both ends of the laminated core The end portion is provided with an end plate for preventing the permanent magnet from flying out of the magnet receiving hole, and the rotor integrally fixed by the riveting pin is configured to make the specific gravity of at least one of the plurality of riveting pins of the rotor and the other The minute balance amount of the rotor is adjusted differently (for example, refer to Patent Document 2).

Furthermore, it is revealed that there is a field magnet core which is inserted into a polygonal rivet. The entrance hole is formed in the laminated stamped steel sheet constituting the field magnet core, and the rivet of the same polygonal shape is inserted into the rivet insertion hole, and the laminated steel plate is fixed by the rivet, so that the distortion does not occur (for example, refer to Patent Document 3) ).

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Patent Laid-Open No. 4-121044

Patent Document 2: Japanese Laid-Open Patent Publication No. 2009-219309

Patent Document 3: Japanese Unexamined Publication No. Hei 61-62538

However, according to the conventional technique disclosed in the above Patent Documents 1 and 2, it is necessary to provide an end plate for preventing scattering of the permanent magnet, and furthermore, since two or more types of rivets are used, the number of parts is increased.

In addition, according to the conventional technique disclosed in the above-mentioned Patent Document 3, since the rivet insertion hole is large compared to the use of a round bar-shaped rivet pin, when applied to a magnet-embedded rotor, The position where the magnet is buried in the hole creates a problem of limitation.

The present invention has been made in view of the above problems, and an object of the invention is to provide a magnet-embedded rotor in which the number of components such as end plates is reduced, and the degree of freedom in designing the position where the magnets are buried in the holes is improved.

In order to achieve the above object, the present invention includes a rotor core formed of a laminated steel sheet and formed into a columnar shape, and having a plurality of rectangular magnet-embedded holes annularly arranged at predetermined intervals on the outer edge portion; and a magnet The holding frame includes: a horizontal frame provided with a caulking portion; and one end portion connected to both end portions of the horizontal frame, the inner width being the same as the lateral width of the rectangular plate-shaped permanent magnet, and the outer width and the magnet embedding hole Two vertical frames are arranged in parallel in the same manner in the circumferential direction; and a head frame connected to the other end of the two vertical frames; wherein the permanent magnet is held between the two vertical frames The magnet embedding hole is embedded, and the caulking portion of the horizontal frame is caulked, and the magnet holding frame is fixed to the rotor core to integrate the rotor core.

The magnet-embedded rotor system of the present invention exhibits the effect of a magnet-embedded rotor in which the number of components such as the end plate is reduced and the design position of the magnet is buried in the hole is improved.

Hereinafter, an embodiment of the magnet-embedded rotor of the present invention will be described in detail based on the drawings. Further, the present invention is not limited to the embodiment.

(embodiment)

Fig. 1 is a longitudinal sectional view showing an embodiment of a magnet-embedded rotor according to the present invention, wherein Fig. 2 is a cross-sectional view taken along line AA of Fig. 1, and Fig. 3 is a view showing the middle of mounting a permanent magnet. Fig. 4 is a perspective view showing a permanent magnet of the embodiment, and Fig. 5 is a perspective view showing a magnet holding frame of an embodiment in which a permanent magnet is attached.

As shown in Fig. 1 and Fig. 2, the rotor core 1 of the magnet-embedded rotor 10 of the embodiment is formed by laminating a plurality of thin bismuth steel sheets (magnetic materials). Cylindrical. A shaft shaft 1a formed in the center of the rotor core 1 is press-fitted and fixed with a shaft (not shown).

In the outer edge portion of the rotor core 1, a plurality of (eight) magnet embedding holes 1b having a rectangular shape in the circumferential direction Ha and a width Hb in the radial direction are annularly arranged at predetermined intervals. A magnetic pole portion 1c is formed on the outer peripheral side of the magnet embedding hole 1b of the rotor core 1.

As shown in FIGS. 1 to 5, the magnet holding frame 2 of the embodiment has a horizontal frame 2a provided with a caulking portion 2f, two parallel vertical frames 2b provided with a holding portion 2g, and a head frame 2c. The ends are connected to each other to form a rectangle.

The inner width Hc of the magnet holding frame 2 is the same as the lateral width Hd of the rectangular plate-shaped permanent magnet 3, and the width Hf between the tips of the holding portions 2g of the two vertical frames 2b (see FIG. 2) is larger than that of the permanent magnet 3. The width Hd is smaller, and the permanent magnet 3 is inserted between the vertical frames 2b of the magnet holding frame 2, and is supported by the vertical frame 2b and the holding portion 2g to be held in the magnet holding frame 2. In the embodiment, the inner height Hk of the magnet holding frame 2 is seven times the height He of the permanent magnet 3, and the seven permanent magnets 3 are fitted into the magnet holding frame 2 without a gap. The permanent magnet 3 and the magnet holding frame 2 are preferably bonded by an adhesive.

The outer width Hg of the magnet holding frame 2 is the same as the circumferential width Ha of the magnet embedding hole 1b of the rotor core 1, and the thickness of the permanent magnet and the thickness Hj of the magnet holding frame 2 are wider than the radial direction of the magnet embedding hole 1b. Hb is the same. The height Hm of the magnet holding frame 2 is larger than the height Hn of the rotor core 1. Furthermore, the lateral width Hp of the head frame 2c is larger than the outer width Hg of the magnet holding frame 2, and The thickness Hq of the head frame 2c is larger than the thickness of the permanent magnet and the thickness Hj of the magnet holding frame 2.

The magnet holding frame 2 in which the seven permanent magnets 3 are held in the frame is inserted from the side of the horizontal frame 2a and buried in the magnet embedding hole 1b of the rotor core 1, and the head frame 2c is brought into contact with one end of the rotor core 1. When the caulking portion 2f of the lateral frame 2a protruding from the other end of the rotor core is swaged, the rotor core 1 formed by laminating a plurality of slab steel sheets is integrally fixed, and the permanent magnet 3 is fixed to the magnet embedding hole 1b. The magnet-embedded rotor 10 of the embodiment shown in Fig. 1 is completed.

As described above, in the magnet-embedded rotor 10 of the embodiment, since the magnet holding frame 2 that functions as a conventional rivet pin is inserted into the magnet embedding hole 1b, the insertion hole for the rivet pin is not required. Further, the embedding step of the permanent magnet 3 and the embedding step of the rivet pin can be performed in one step, and the number of combinations can be reduced. Further, since it is not necessary to arrange the insertion hole for the rivet pin in the rotor core 1, the restriction of the arrangement position of the magnet insertion hole 1b disappears, and the degree of freedom in design rises.

Further, since the horizontal frame 2a and the head frame 2c of the magnet holding frame 2 are restrained from moving in the axial direction of the permanent magnet 3, the conventional end plate for preventing the permanent magnet 3 from falling off is not required. Further, the prior art balance adjustment of the rotor by cutting the end plate with a drill can be performed by cutting the horizontal frame 2a and the head frame 2c with a drill.

Further, since the magnet holding frame 2 is configured to support only the side end portions of the permanent magnets 3 by the vertical frames 2b and the holding portions 2g, and does not have the wall supporting the front and back surfaces of the permanent magnets 3, it can be from the front and back. Insert permanent magnets 3 on both sides The frame 2 is held by the magnet. Further, since the magnet holding frame 2 does not have a wall or the like supporting the front and back surfaces of the permanent magnet 3, it is possible to prevent the occurrence of loss due to the eddy current.

1‧‧‧Rotor core

1a‧‧‧Axis hole

1b‧‧‧Magnetic buried hole

1c‧‧‧Magnetic pole

2‧‧‧ Magnet Holder

2a‧‧‧ transverse frame

2b‧‧‧ vertical frame

2c‧‧‧ head box

2f‧‧‧Riveting

2g‧‧‧keeping department

3‧‧‧ permanent magnet

10‧‧‧Magnetic embedded rotor

Ha‧‧‧ week direction width

Hb‧‧ ‧ wide direction

Hc‧‧‧ inner width

Hd, Hp‧‧‧ width

He, Hn‧‧‧ height

Hf‧‧ wide

Hg‧‧‧outer width

Hj, Hq‧‧ thickness

Fig. 1 is a longitudinal sectional view showing an embodiment of a magnet-embedded rotor of the present invention.

Fig. 2 is a cross-sectional view taken along line A-A of Fig. 1.

Fig. 3 is a perspective view showing the magnet holding frame of the embodiment in the middle of mounting the permanent magnet.

Fig. 4 is a perspective view showing a permanent magnet of the embodiment.

Fig. 5 is a perspective view showing a magnet holding frame of an embodiment in which a permanent magnet is attached.

1‧‧‧Rotor core

1a‧‧‧Axis hole

1b‧‧‧Magnetic buried hole

1c‧‧‧Magnetic pole

2‧‧‧ Magnet Holder

2b‧‧‧ vertical frame

2g‧‧‧keeping department

3‧‧‧ permanent magnet

10‧‧‧Magnetic embedded rotor

Ha‧‧‧ week direction width

Hb‧‧ ‧ wide direction

Hf‧‧ wide

Claims (4)

A magnet-embedded rotor includes a rotor core formed of a laminated steel sheet and formed into a columnar shape, and has a plurality of rectangular magnet-embedded holes annularly arranged at predetermined intervals on the outer edge portion; and a magnet holding frame a horizontal frame provided with a caulking portion; the one end portion is connected to both end portions of the horizontal frame, and the inner width is the same as the lateral width of the rectangular plate-shaped permanent magnet, and the outer width is wider than the circumferential direction of the magnet embedding hole Two vertical frames arranged in parallel in the same manner; and a head frame connected to the other end of the two vertical frames; wherein the permanent magnet is held between the two longitudinal frames The magnet is embedded in the hole, and the caulking portion of the horizontal frame is swaged to fix the magnet holding frame to the rotor core and integrated with the rotor core. The magnet-embedded rotor according to the first aspect of the invention, wherein the vertical frame of the magnet holding frame has a holding portion that is held so that the permanent magnet does not fall off. The magnet-embedded rotor according to claim 1, wherein the magnet holding frame and the permanent magnet are bonded by an adhesive. The magnet-embedded rotor according to claim 1, wherein the balance is adjusted by cutting a head frame and a horizontal frame of the magnet holding frame.