JP2021176246A - Embedded magnet type rotor, motor, and electrical apparatus - Google Patents

Abstract

To provide an embedded magnet type rotor and the like capable of obtaining desired magnetic density without reducing mechanical strength even if a bond magnet with low magnetic characteristics is used.SOLUTION: A motor 1 has: a first rotor core 110 with a first magnet embedding hole 111; and a second rotor core 120 arranged on both ends of the first rotor core 110 in a rotation axis direction and having a plurality of second magnet embedding holes 220. Bond magnets (a first bond magnet 310, a second bond magnet 320) are embedded in each of a first magnet embedding hole 210 and the plurality of second magnet embedding holes 220. An outer peripheral side border line forming an opening of the first magnet embedding hole 210 is configured so as to form a gear-like single opening, in which border lines of a plurality of projection parts of the first rotor core 110 are connected to each other to be arranged radially, and are integrated with an inner peripheral side border line. The plurality of second magnet embedding holes 220 are separated from each other along a rotation direction of the second rotor core 120 to be formed.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to an embedded magnet type rotor in which a permanent magnet is embedded in a rotor core, a motor including the embedded magnet type rotor, and an electric device including the motor.

The permanent magnet type motor is located at, for example, a substantially cylindrical stator that generates a rotating magnetic field, a rotor that is arranged on the inner peripheral side of the stator through a gap between the stator and the rotor, and a magnetic pole formed by a permanent magnet, and a center of the rotor. It is equipped with a provided shaft, and the rotor rotates around the shaft.

Further, as a rotor, in order to secure strength against centrifugal force applied when rotating at high speed, and to give reluctance torque by arranging permanent magnets, a magnet insertion hole provided in the rotor core is provided. Embedded magnet type rotors with a permanent magnet inserted are widely used.

By the way, as the permanent magnet, a solid segment magnet formed by casting or sintering is often used, but in order to improve workability at the time of rotor assembly, the magnet insertion hole provided in the rotor core is a segment magnet. It is formed in a shape slightly larger than the outer shape. Therefore, a gap is generated between the rotor core and the segment magnet, and the magnetic resistance due to the gap reduces the surface magnetic flux density of the rotor. Further, since the segment magnet has a hard and brittle property, if the magnet shape is complicated in order to utilize the reluctance torque, the processing cost increases.

Therefore, an embedded magnet type rotor in which a bond magnet is embedded in a magnet embedding hole of a rotor core has been proposed (Patent Document 1). In Patent Document 1, a bond magnet is embedded in a magnet insertion hole by filling a magnet embedding hole with a bonded magnet fluid, which is a mixture of a binder made of a resin material and magnet powder (permanent magnet), and curing the magnet. An embedded magnet type rotor is disclosed. By using the bond magnet in this way, the bond magnet is filled without gaps according to the shape of the magnet insertion hole, so that it is possible to suppress a decrease in the surface magnetic flux density of the rotor due to the gap between the rotor core and the magnet insertion hole.

However, since the bond magnet has a lower energy density and lower magnetic characteristics than the segment magnet obtained by casting and sintering, the magnetic flux density of the rotor becomes low. Therefore, an embedded magnet type rotor using a bond magnet having high magnetic characteristics has been proposed. Specifically, a bonded magnet fluid in which small pieces of a cast / sintered magnet having a high energy density are mixed with a resin material is filled in a magnet embedding hole of a rotor core and cured. As a result, a bond magnet having high magnetic characteristics can be embedded in the magnet embedding hole, so that the magnetic flux density can be improved while suppressing a decrease in the surface magnetic flux density of the rotor.

Japanese Unexamined Patent Publication No. 10-304610

However, since the cast / sintered magnet having a high energy density is composed of an expensive rare earth metal, the cost of the rotor is high.

Further, even when a bond magnet that does not use a rare earth metal is used, the magnetic density of the rotor can be improved by enlarging the magnet insertion hole and increasing the amount of the bond magnet. If the size is increased, the rotor core is eliminated by that amount, and the mechanical strength of the rotor is reduced.

The present disclosure solves such a problem, and an embedded magnet type rotor capable of obtaining a desired magnetic density without lowering the mechanical strength and even when a bonded magnet having low magnetic characteristics is used. Etc. are intended to be provided.

In order to achieve the above object, one aspect of the embedded magnet type rotor according to the present disclosure includes a rotation shaft, a bond magnet, and a first magnet embedding hole and a central portion having a plurality of protrusions protruding in the outer peripheral direction. A first rotor core having a columnar first shaft hole and a plurality of second magnet embedding holes arranged at both ends in the rotation axis direction of the first rotor core, and a columnar second shaft at the center. It is provided with two second rotor cores having holes, and the bond magnet is embedded in each of the first magnet embedding hole and the plurality of second magnet embedding holes, and the first magnet embedding hole is provided. The outer peripheral side contour line forming the opening is formed by connecting the contour lines of the plurality of protrusions to each other and arranging them radially and integrating with the inner peripheral side contour line to form one gear-shaped opening. The plurality of second magnet embedding holes are formed so as to be separated from each other along the rotation direction of the second rotor core, and the two second rotor cores rotate the first rotor core. The first rotor core and the two second rotor cores are fixed to each other in a state of being sandwiched in the axial direction, and the rotating shaft is inserted into the first shaft hole and the second shaft hole. , The entire side surface of each column formed by the first shaft hole and the two second shaft holes and the side surface of the rotating shaft are fixed to form a rotor.

Further, one aspect of the motor according to the present disclosure includes the above-mentioned embedded magnet type rotor and a stator arranged so as to surround the embedded magnet type rotor.

Further, one aspect of the electric device according to the present disclosure is equipped with the above-mentioned motor.

A desired magnetic density can be obtained without lowering the mechanical strength and even if a bonded magnet having low magnetic characteristics is used.

It is a perspective view of the motor which concerns on embodiment. It is sectional drawing of the motor which concerns on embodiment in line II-II of FIG. It is a perspective view of the rotor which concerns on embodiment. It is sectional drawing of the rotor which concerns on embodiment. It is sectional drawing of the motor which concerns on embodiment in the VV line of FIG. It is a perspective view of the rotor of the comparative example. It is a figure which shows the simulation result of the induced voltage about the rotor which concerns on embodiment and the rotor of a comparative example. It is a perspective view of the motor which concerns on a modification.

Hereinafter, embodiments of the present disclosure will be described. It should be noted that all of the embodiments described below show a preferred specific example of the present disclosure. Therefore, the numerical values, the components, the arrangement positions and connection forms of the components, the steps and the order of the steps, etc., which are shown in the following embodiments, are examples and are not intended to limit the present disclosure. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present disclosure will be described as arbitrary components.

Further, each figure is a schematic view and is not necessarily exactly illustrated. In each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description will be omitted or simplified.

(Embodiment)
First, the configuration of the motor 1 according to the embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of the motor 1 according to the embodiment. FIG. 2 is a cross-sectional view of the motor 1 in line II-II of FIG.

As shown in FIGS. 1 and 2, the motor 1 includes a rotor 10, a stator 20, and a shaft 30. The motor 1 in the present embodiment is an inner rotor type motor in which the rotor 10 is arranged inside the stator 20. That is, the stator 20 is arranged so as to surround the rotor 10.

The rotor (rotor) 10 rotates around the shaft 30 as the center of rotation. The rotor 10 is arranged inside the stator 20 via a small air gap with the stator 20. In the present embodiment, the rotor 10 is an embedded magnet type rotor in which a bond magnet 300 is embedded as a permanent magnet in a magnet embedded hole 200 provided in the rotor core (iron core) 100. The bond magnet 300 is a solidified bond magnet fluid in a state of being poured into the magnet embedding hole 200 and filled. The detailed configuration of the rotor 10 will be described later.

The stator 20 (stator) generates a magnetic force acting on the rotor 10. The stator 20 has, for example, a stator core 21 (iron core) and a winding coil 22 (stator coil). The winding coil 22 is wound around each of the plurality of teeth 21a provided on the stator core 21. The stator 20 is composed of, for example, a plurality of punched electrical steel sheets laminated in the axial direction (rotational axial direction) of the shaft 30.

The shaft 30 is a metal rod and is fixed to the center of the rotor 10. The shaft 30 penetrates the rotor 10 so as to extend to both sides of the rotor 10. For example, the shaft 30 is inserted into the center hole 10a of the rotor 10 by press fitting and fixed to the rotor 10.

In the motor 1 configured in this way, when the winding coil 22 of the stator 20 is energized, a field current flows through the winding coil 22 to generate a magnetic flux in the stator 20 (stator core 21), and the magnetic flux of the stator 20 is combined with the magnetic flux of the stator 20. The magnetic force generated by the interaction with the magnetic flux generated from the bond magnet 300 of the rotor 10 becomes the torque for rotating the rotor 10, and the rotor 10 rotates.

Next, the detailed configuration of the rotor 10 according to the present embodiment will be described with reference to FIGS. 3 to 5 with reference to FIG. FIG. 3 is a perspective view of the rotor 10 according to the embodiment. FIG. 4 is a cross-sectional view of the rotor 10 and shows a cross section when the rotor 10 is cut in a plane having the shaft 30 as a normal at the center in the longitudinal direction of the shaft 30. Specifically, FIG. 4 shows a cross section of the first rotor core 110 of the rotor 10. FIG. 5 is a cross-sectional view of the motor 1 in the VV line of FIG.

As shown in FIGS. 2 to 5, the rotor 10 includes a first rotor core 110 and a second rotor core 120. That is, the rotor core 100 of the rotor 10 is composed of the first rotor core 110 and the second rotor core 120.

Further, the magnet embedding hole 200 of the rotor 10 is composed of the first magnet embedding hole 210 of the first rotor core 110 and the second magnet embedding hole 220 of the second rotor core 120, and the bond magnet 300 of the rotor 10 is composed of the second magnet embedding hole 220. It is composed of a first bond magnet 310 of the first rotor core 110 and a second bond magnet 320 of the second rotor core 120. The rotor 10 has a plurality of magnetic poles at equal intervals along the circumferential direction by the bond magnet 300.

In the present embodiment, the second rotor core 120 is arranged at both ends of the first rotor core 110 in the rotation axis direction. That is, two second rotor cores 120 are arranged, and the first rotor core 110 is arranged so as to be sandwiched between the two second rotor cores 120.

As shown in FIG. 2, each of the first rotor core 110 and the second rotor core 120 is a laminated body of a plurality of electromagnetic steel sheets. Specifically, each of the first rotor core 110 and the second rotor core 120 is composed of a plurality of punched electrical steel sheets laminated in the axial direction (rotational axial direction) of the shaft 30. In each of the first rotor core 110 and the second rotor core 120, the plurality of electrical steel sheets are fixed to each other by, for example, caulking. The plurality of electromagnetic steel sheets constituting the first rotor core 110 have the same shape and the same thickness. Further, the plurality of electromagnetic steel sheets constituting the second rotor core 120 have the same shape and the same thickness as each other.

As will be described later, in the present embodiment, the shape of the first magnet embedding hole 210 of the first rotor core 110 and the shape of the second magnet embedding hole 220 of the second rotor core 120 are different. The shape of the electromagnetic steel sheet forming the 1 rotor core 110 is different from the shape of the electromagnetic steel sheet forming the second rotor core 120.

As shown in FIGS. 2 and 4, the first rotor core 110 forms a first magnet embedding hole 210 having a plurality of protrusions into which a permanent magnet is embedded. Each first magnet embedding hole 210 is formed so as to penetrate the first rotor core 110.

A first bond magnet 310 is embedded as a permanent magnet in each of the first magnet embedding holes 210 having a plurality of protrusions. The first bond magnet 310 is composed of a binder and magnet powder. Specifically, each first magnet is embedded by filling each first magnet embedding hole 210 with a bonded magnet fluid, which is a mixture of a binder made of a resin material and magnet powder such as a ferrite magnet, and curing the mixture. The first bond magnet 310 is embedded in the hole 210 without any gap. In the present embodiment, the first bond magnet 310 does not contain a rare earth metal.

As shown in FIG. 4, the first rotor core 110 has a first magnet embedding hole 210 having a plurality of protrusions protruding in the outer peripheral direction, and a columnar first shaft hole in the center. The outer peripheral side contour line 211 forming the opening of the first magnet embedding hole 210 is arranged radially with the contour lines of the plurality of protruding portions of the first rotor core 110 connected to each other and with the inner peripheral side contour line 212. It is configured to be integrated to form one gear-shaped opening. That is, the first magnet embedding hole 210 having a plurality of protrusions is connected and integrated around the shaft 30 (rotating shaft) on the inner diameter side of the first rotor core 110, and has a plurality of protrusions. 1 Adjacent magnetic poles of the magnet embedding holes 210 are integrated with each other on the inner diameter side (inner circumference side).

As described above, the outer peripheral side contour line 211 has a gear shape, and the inner peripheral side contour line 212 has a ring shape (annular ring shape). Further, the outer peripheral side contour line 211 and the inner peripheral side contour line 212 that are connected are physically separated from each other and are not connected. Therefore, the first rotor core 110 has a ring-shaped electrical steel sheet so as to surround the shaft 30.

Specifically, the first rotor core 110 is composed of a first rotor core outer peripheral portion 110a forming the outer peripheral side contour line 212 and a first rotor core inner peripheral portion 110b forming the inner peripheral side contour line 212. As shown in FIG. 4, the inner peripheral portion 110b of the first rotor core, which is a ring-shaped electromagnetic steel plate, and the outer peripheral portion 110a of the first rotor core, which is a gear shape, are not physically connected.

Therefore, for example, as shown in FIG. 5, the first rotor core outer peripheral portion 110a and the first rotor core inner peripheral portion 110b are formed integrally with the second rotor core 120 by caulking. The rotor core 110 and the second rotor core 120 are integrally fixed. That is, by fixing the inner peripheral portion 110b of the first rotor core and the second rotor core 120 by caulking, and separately fixing the outer peripheral portion 110a of the first rotor core and the second rotor core 120 by caulking, the ring-shaped first rotor core The inner peripheral portion 110b, the gear-shaped first rotor core outer peripheral portion 110a, and the second rotor core 120 are integrally fixed. As a result, the first rotor core 110 and the second rotor core 120 are integrally fixed without physically separating the inner peripheral portion 110a of the first rotor core.

The plurality of protrusions of the first magnet embedding hole 210 are formed along the rotation direction (circumferential direction) of the first rotor core 110. In the present embodiment, the first magnet embedding holes 210 having 10 protrusions are formed at equal intervals along the rotation direction. Therefore, in the first rotor core 110, 10 magnetic poles are formed radially around the shaft 30 (rotating shaft).

Further, the opening shape of each of the plurality of protrusions of each first magnet embedding hole 210 is a rectangular shape extending in the radial direction of rotation from the shaft 30 (rotation shaft). That is, a plurality of rectangular first magnet embedding holes 210 are formed so as to extend radially from the shaft 30, and are connected to each other at the roots of the first magnet embedding holes 210 on the shaft 30 side. There is.

As described above, in the first rotor core 110 in the present embodiment, the first magnet embedding hole 210 is configured as one opening in which a plurality of protrusions are integrated. Therefore, the first magnet embedding hole 210 is continuously filled with the first bond magnet 310, and the first bond magnet 310 is continuously present on the entire circumference of the shaft 30 in the rotation direction without interruption.

As shown in FIGS. 2 and 3, each of the two second rotor cores 120 has a plurality of second magnet embedding holes 220 in which permanent magnets are embedded and a cylindrical second shaft hole in the center. .. Each second magnet embedding hole 220 is formed so as to penetrate the second rotor core 120.

A second bond magnet 320 is embedded as a permanent magnet in each of the plurality of second magnet embedding holes 220. The second bond magnet 320 is composed of a binder and magnet powder. Specifically, each second magnet is embedded by filling each second magnet embedding hole 220 with a bonded magnet fluid, which is a mixture of a binder made of a resin material and magnet powder such as a ferrite magnet, and curing the mixture. The second bond magnet 320 is embedded in the hole 220 without a gap. In the present embodiment, the second bond magnet 320 does not contain a rare earth metal. Further, the second bond magnet 320 of the second rotor core 120 is made of a bond magnet material having the same composition ratio as that of the first bond magnet 310 of the first rotor core 110, but is not limited thereto.

As shown in FIG. 3, the plurality of second magnet embedding holes 220 are formed so as to be separated from each other along the rotation direction (circumferential direction) of the second rotor core 120. That is, each of the plurality of second magnet embedding holes 220 constitutes one pole, and the adjacent magnetic poles of the plurality of second magnet embedding holes 220 are separated from each other. In the present embodiment, 10 second magnet embedding holes 220 are formed at equal intervals along the rotation direction. Therefore, in the second rotor core 120, 10 magnetic poles are formed radially around the shaft 30 (rotating shaft).

Each of the plurality of second magnet embedding holes 220 is formed so as to have both ends on the outer peripheral portion of the second rotor core 120. The contour line forming the second magnet embedding hole 220 includes an outer peripheral side contour line 221 located on the outer peripheral side of the rotor 1 and an inner peripheral side contour line 222 located on the shaft 30 side (rotating shaft side). I'm out. In each of the plurality of second magnet embedding holes 220, the outer peripheral side contour line 221 and the inner peripheral side contour line 222 are physically connected, and each second magnet embedding hole 220 has one opening. It is configured.

In the present embodiment, each of the plurality of second magnet embedding holes 220 has a substantially V shape, and the shape of the outer peripheral side contour line 221 and the shape of the inner peripheral side contour line 222 of each second magnet embedding hole 220. A part of is an arc having a center point in the outer peripheral direction of the second rotor core 120. Further, a part of the outer peripheral side contour line of the second magnet embedding hole 220 is at the same position as a part of the outer peripheral side contour line 211 of the first magnet embedding hole 210 with respect to the axial direction of the shaft 30.

In the rotor 10 configured in this way, the two second rotor cores 120 are fixed to each other with the one first rotor core 110 sandwiched in the direction of the rotation axis, and the first rotor core 110 and the two second rotor cores 120 are fixed to each other. With the shaft 30 (rotating shaft) inserted into the first shaft hole of the first rotor core and the second shaft hole of the second rotor core 120, the first shaft hole and the two second shaft holes The entire side surface of each column formed and the side surface of the shaft 30 are fixed.

Further, as shown in FIG. 3, in the present embodiment, the length H1 of the first rotor core 110 in the rotation axis direction is derived from the length (H2 × 2) of the two second rotor cores 120 combined in the rotation axis direction. Long (H1> H2 × 2). The length H1 of the first rotor core 110 in the rotation axis direction is longer than the length (H2) of one second rotor core 120 in the rotation axis direction. That is, the first rotor core 110 is thicker than the second rotor core 120. Further, the lengths H2 of the two second rotor cores 120 in the rotation axis direction are the same as each other.

The rotor 10 configured in this way can be manufactured by fixing the first rotor core 110 and the second rotor core 120 to the shaft 30.

Specifically, as shown in FIG. 5, the first rotor core 110 composed of the outer peripheral portion 110a of the first rotor core and the inner peripheral portion 110b of the first rotor core, which are a plurality of punched electrical steel sheets having a predetermined shape, is sandwiched. Two second rotor cores 120 are arranged.

Then, the outer peripheral portion 110a of the first rotor core and the second rotor core 120 of the first rotor core 110 are integrally crimped, and the inner peripheral portion 110b of the first rotor core and the second rotor core 120 of the first rotor core 110 are integrally crimped. Then, the first rotor core 110 and the second rotor core 120 are integrally fixed.

Further, the shaft 30 is inserted into the central hole (shaft hole) of the integrated first rotor core 110 and the second rotor core 120, and the shaft 30 is press-fitted into the two second rotor core 120 and the one first rotor core 110. do.

Then, as shown in FIG. 2, the first magnet embedding hole 210 provided in the first rotor core 110 is formed by pouring the bonded magnet fluid into the second magnet embedding hole 220 provided in the second rotor core 120. The bond magnet fluid also flows into the second rotor core 120, and the bond magnet fluid also flows into the second magnet embedding hole 220 provided in the other second rotor core 120, and the bond magnet fluid flows into the first rotor core 120 and both ends thereof. The second rotor core 120 is filled and cured.

Thereby, the rotor 10 in which the second rotor core 120 is provided so as to sandwich the first rotor core 110 arranged in the central portion of the rotor 10 can be manufactured.

Here, with reference to FIGS. 6 and 7, the action and effect of the rotor 10 in the present embodiment will be described in comparison with the rotor 10X of the comparative example. FIG. 6 is a perspective view of the rotor 10X of the comparative example. FIG. 7 is a diagram showing simulation results of induced voltages for the rotor 10 according to the embodiment and the rotor 10 of the comparative example.

As shown in FIG. 6, the rotor 10X of the comparative example is an embedded magnet type rotor in which a bond magnet 300X is embedded in a magnet embedding hole 200X of the rotor core 100X, similarly to the rotor 10 according to the present embodiment. In the rotor 10X of the comparative example, the rotor core 100X is formed by punching and laminating the punched electromagnetic steel sheets in the same shape in the rotation axis direction.

Then, in the rotor 10X of the comparative example, the rotor core 100X, the magnet embedding hole 200X, and the bond magnet 300X are the second rotor core 120, the second magnet embedding hole 220, and the second bond magnet in the rotor 10 according to the present embodiment. It has the same configuration as 320. That is, the rotor 10X of the comparative example does not have a configuration corresponding to the first rotor core 110 of the rotor 10, and is configured only by the second rotor core 120.

The length of the rotor 10X in the comparative example in the rotation axis direction is the same as the length of the rotor 10 in the rotation axis direction (H1 + 2 × H2) in the present embodiment. The induced voltage simulation was performed by magnetic field analysis using the finite element method.

As shown in FIG. 7, it was confirmed that the rotor 10 in the present embodiment can increase the induced voltage as compared with the rotor 10X of the comparative example. This is because the rotor 10 in the present embodiment uses the first rotor core 110 in which the magnetic steel plate (rotor core) between the magnetic poles is eliminated and the bond magnet is integrated. That is, the amount of effective magnetic flux that contributes to torque can be increased by filling a large amount of the first bond magnet 310 that contributes to magnetic flux generation in the first magnet embedding hole 210 of the first rotor core 110. ..

As described above, the rotor 10 in the present embodiment is arranged at each of the first rotor core 110 having the first magnet embedding hole 210 in which the first bond magnet 310 is embedded and both ends of the first rotor core 110 in the rotation axis direction. The second rotor core 120 has a plurality of second magnet embedding holes 220 in which the second bond magnet 320 is embedded. The shape of the cross section of the first rotor core 110 perpendicular to the rotation axis of the first magnet embedding hole 210 is formed by the outer peripheral side contour line 211 and the inner peripheral side contour line 212. Further, the plurality of second magnet embedding holes 220 of the second rotor core 120 are formed so as to be separated from each other along the rotation direction of the second rotor core 120.

With this configuration, the first magnet embedding hole 210 having a plurality of protrusions is integrated in the central portion in the rotation axis direction of the rotor 10 that contributes most to the torque, and the electromagnetic steel plate (rotor core) between the magnetic poles is eliminated and integrated. A first rotor core 110 in which the modified first bond magnet 310 is present all around is arranged. As a result, the magnetic resistance due to the electromagnetic steel plate between the magnetic poles, which causes a decrease in magnetic flux, can be eliminated, and the magnet magnetic flux due to the bond magnet can be effectively utilized. Therefore, the interlinkage magnetic flux with the stator 20 is increased to obtain torque. The amount of effective magnetic flux that contributes to the above can be increased.

In other words, the bond magnet that does not use rare earth metal has a lower magnetic density than the bond magnet that uses rare earth metal such as rare earth sintered magnet, so the amount of magnetic flux generated from the bond magnet decreases and the amount of effective magnetic flux that contributes to torque. However, according to the rotor 10 in the present embodiment, even if a bond magnet having low magnetic characteristics that does not use rare earth metal is used, the amount of effective magnetic flux that contributes to torque is increased to obtain a desired magnetic density. be able to.

Further, at both ends of the rotor 10 in the rotation axis direction, the outer peripheral side contour line 221 and the inner peripheral side contour line 222 of the second magnet embedding hole 220 are mechanically separated by the electromagnetic steel plate (rotor core) arranged between the magnetic poles. The connected second rotor core 120 is arranged. This makes it possible to secure the mechanical strength of the rotor core 100 against the centrifugal force of the rotor 10 as a whole.

As described above, according to the rotor 10 according to the present embodiment, a desired magnetic density can be obtained without lowering the mechanical strength and even if a bond magnet having low magnetic characteristics is used. As a result, a desired magnetic density can be obtained without using an expensive rare earth metal as the magnet of the bond magnet.

Further, in the rotor 10 of the present embodiment, the magnet embedding hole 200 (first magnet embedding hole 210, second magnet embedding hole 220) is filled with the bond magnet 300 (first bond magnet 310, second bond magnet 320). Is directly filled and cured, so even if electromagnetic steel sheets having different shapes are used for the first rotor core 110 and the second rotor core 120, the rotor 10 can be manufactured without increasing the assembly process. ..

Further, in the rotor 10 according to the present embodiment, the length H1 of the first rotor core 110 in the rotation axis direction is longer than the length (H2 × 2) of the second rotor core 120 combined in the rotation axis direction. ..

With this configuration, the ratio of the length of the first rotor core 110 in which the adjacent magnetic poles are integrated to the length of the entire rotor core 100 in the rotation axis direction is made larger than the ratio of the length of the second rotor core 120. Can be done. As a result, the amount of effective magnetic flux that contributes to torque can be further increased to increase torque, so that the rotor 10 suitable for high torque applications and the like can be realized.

(Modification example)
Although the motor 1 and the rotor 10 according to the present disclosure have been described above based on the embodiment, the present disclosure is not limited to the above embodiment.

For example, in the above embodiment, the length (H1) of the first rotor core 110 in the rotation axis direction is made longer than the length (H2 × 2) of the second rotor core 120 combined in the rotation axis direction. Not limited to this, as shown in FIG. 8, even if the length (H2 × 2) of the two second rotor cores 120 combined in the rotation axis direction is made longer than the length (H1) of the first rotor core 110 in the rotation axis direction. Good (H2 × 2> H1). Further, although not shown, the length (H2 × 2) of the two second rotor cores 120 combined in the rotation axis direction and the length (H1) of the first rotor core 110 in the rotation axis direction are made the same. It may be good (H2 × 2 = H1).

With this configuration, the length of the second rotor core 120 in which the outer peripheral side contour line 221 and the inner peripheral side contour line 222 of the second magnet insertion hole 220 are mechanically connected with respect to the length of the entire rotor core 100 in the rotation axis direction. The ratio of the magnets can be made larger than the ratio of the lengths of the first rotor core 110. As a result, the mechanical strength of the entire rotor due to centrifugal force can be further increased without changing the shapes of the electromagnetic steel plates of the first rotor core 110 and the second rotor core 120, so that a rotor suitable for high-speed rotation applications and the like can be realized. can.

Further, in the above embodiment, the shapes of the outer peripheral side contour line 211 and the inner peripheral side contour line 212 of each second magnet embedding hole 220 of the second rotor core 120 form an arc having a center point in the outer peripheral direction of the rotor 1. It has a shape, but it is not limited to this. For example, the outer peripheral side contour line 221 and the inner peripheral side contour line 222 of each second magnet embedding hole 220 have a center point in the outer peripheral direction of the rotor 1 and include an arc having two or more different curvatures. There may be.

Further, the opening shape of each second magnet embedding hole 220 of the second rotor core 120 is substantially C-shaped, but is not limited to this. For example, the opening shape of each second magnet embedding hole 220 may be a substantially V-shape, a substantially U-shape, or a substantially rectangular shape. That is, any shape can be applied as the opening shape of the second magnet embedding hole 220.

Further, in the above embodiment, the first bond magnet 310 and the second bond magnet 320 did not contain the rare earth metal, but at least one of the first bond magnet 310 and the second bond magnet 320 contained the rare earth metal. May be included. By using rare earth metal as the magnets of the first bond magnet 310 and the second bond magnet 320, a bond magnet having a high energy density can be realized, and the magnetic density of the rotor can be further improved. When the first bond magnet 310 and the second bond magnet 320 contain a rare earth metal, the magnet of the bond magnet may be composed of only the rare earth metal, or the magnet of the bond magnet may be both a farite magnet and a rare earth metal. May be configured using.

Further, in the above embodiment, the number of poles of the magnetic poles of the rotor 10 is 10 (that is, the number of the first magnet embedding holes 210 and the second magnet embedding holes 220 is 10), but the present invention is not limited to this. For example, as long as the number of poles of the magnetic poles of the rotor 10 is 2n (n is a natural number), any number can be applied.

Further, the motor 1 in the above embodiment can be mounted on various electric devices. For example, it can be used for household electric devices such as vacuum cleaners, air conditioners, and refrigerators, or for industrial electric devices such as automobile devices and robots.

The technique of the present disclosure can be used, for example, as an embedded magnet type rotor. Further, the technique of the present disclosure can be widely used not only as a rotor but also as a motor including a rotor and an electric device including the motor.

1 Motor 10 Rotor 10a Center hole (shaft hole)
20 Stator 21 Stator core 21a Teeth 22 Winding coil 30 Shaft (rotating shaft)
100 Rotor core 110 1st rotor core 110a 1st rotor core outer circumference (gear-shaped core)
110b 1st rotor core peripheral part (annular core)
120 2nd rotor core 200 Magnet embedding hole 210 1st magnet embedding hole 211, 221 Outer circumference side contour line 212, 222 Inner circumference side contour line 220 2nd magnet embedding hole 300 Bond magnet 310 1st bond magnet 320 2nd bond magnet

Claims (14)

Rotation axis and
With a bond magnet
A first magnet embedding hole having a plurality of protrusions protruding in the outer peripheral direction and a first rotor core having a columnar first shaft hole in the center.
It is provided with a plurality of second magnet embedding holes and two second rotor cores having a cylindrical second shaft hole in the center, which are arranged at both ends in the rotation axis direction of the first rotor core.
The bond magnet is embedded in each of the first magnet embedding hole and the plurality of second magnet embedding holes.
The outer peripheral side contour line forming the opening of the first magnet embedding hole is a gear-like contour line in which the contour lines of the plurality of protrusions are connected to each other and arranged radially and integrated with the inner peripheral side contour line. It is configured to form one opening and
The plurality of second magnet embedding holes are formed so as to be separated from each other along the rotation direction of the second rotor core.
The two second rotor cores are fixed to each other with the first rotor core sandwiched in the direction of the rotation axis, and the first rotor core and the two second rotor cores have the rotation axis of the first shaft hole. And, in the state of being inserted into the second shaft hole, the entire side surface of each cylinder formed by the first shaft hole and the two second shaft holes and the side surface of the rotating shaft are fixed. , Forming a rotor,
Embedded magnet type rotor. The first rotor core is composed of an outer peripheral portion of the first rotor core forming the outer peripheral side contour line and an inner peripheral portion of the first rotor core forming the inner peripheral side contour line.
The outer peripheral portion of the first rotor core and the inner peripheral portion of the first rotor core are integrally formed with respect to the second rotor core by caulking, so that the first rotor core and the second rotor core are integrated. Fixed to,
The embedded magnet type rotor according to claim 1. The contour line forming the second magnet embedding hole includes an outer peripheral side contour line located on the outer peripheral side of the rotor and an inner peripheral side contour line located on the rotation axis side.
A part of the outer peripheral side contour line of the first magnet embedding hole and a part of the outer peripheral side contour line of the second magnet embedding hole are at the same position with respect to the axial direction of the rotation axis.
The embedded magnet type rotor according to claim 1 or 2. The bonded magnet is magnetized either isotropic or anisotropic.
The embedded magnet type rotor according to any one of claims 1 to 3. The length of the first rotor core in the rotation axis direction is longer than the length of the two second rotor cores combined in the rotation axis direction.
The embedded magnet type rotor according to any one of claims 1 to 4. The length of the two second rotor cores combined in the rotation axis direction is longer than the length of the first rotor core in the rotation axis direction.
The embedded magnet type rotor according to any one of claims 1 to 4. The opening shape of each of the plurality of protrusions of the first magnet embedding hole is a rectangular shape extending in the radial direction of rotation from the rotation axis.
The embedded magnet type rotor according to claim 6. Each of the outer peripheral side contour lines and the inner peripheral side contour lines of the plurality of second magnet embedding holes has a shape including an arc having a center point in the outer peripheral direction of the rotor.
The embedded magnet type rotor according to claim 6 or 7. The shape of the outer peripheral side contour line and the inner peripheral side contour line of each of the plurality of second magnet embedding holes is a shape including an arc having a center point in the outer peripheral direction of the rotor and having two different curvatures.
The embedded magnet type rotor according to claim 6 or 7. The opening shape of each of the plurality of second magnet embedding holes is substantially V-shaped.
The embedded magnet type rotor according to claim 6 or 7. The opening shape of each of the plurality of second magnet embedding holes is substantially U-shaped.
The embedded magnet type rotor according to claim 6 or 7. The embedded magnet type rotor according to any one of claims 1 to 11, wherein each of the first rotor core and the second rotor core is a laminated body of a plurality of electrical steel sheets. The embedded magnet type rotor according to any one of claims 1 to 12,
A stator arranged so as to surround the embedded magnet type rotor.
motor. An electric device on which the motor according to claim 13 is mounted.

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