JP2008236960A - Motor rotor, motor, air conditioner and manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide low noise of a motor rotor, high productivity and low cost. <P>SOLUTION: This motor rotor 100 includes: a shaft 1; a rotor magnet 5 integrally formed from a main magnet 6 and a position detection magnet 7 disposed in the vicinity to one axial end face of the main magnet 6 with thermoplastic resin 8; an elastic body 17 such as rubber charged in between the shaft 1 and the rotor magnet 5; and a ring-shaped partition member 14 for partitioning the elastic body 17 such as rubber into multi-layer in a radial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotor of an electric motor used for a brushless motor, a stepping motor or the like.

  In order to prevent the vibration in the rotational direction from being transmitted to a load such as a fan and to provide a permanent magnet rotor that is less deformed with respect to the radial force, such as iron that is fixed to the inner peripheral side of the permanent magnet. Filled between outer and inner cores, outer peripheral part (outer core) made of rigid material, inner peripheral part (inner core) made of rigid material such as iron that adheres to the outer peripheral side of the shaft It is made of an elastic body such as rubber, and the elastic body is provided with a plurality of radially extending through holes in the circumferential direction. Furthermore, in order to increase the rigidity in the radial direction, a plurality of convex protrusions are provided on both or either of the inner peripheral side of the outer core and the outer peripheral side of the inner core. A permanent magnet rotor has been proposed in which rubbers are filled in adjacent portions of the outer core and the inner core so that they are close to each other and face each other (see, for example, Patent Document 1).

  In order to realize a means for preventing axial, radial and rotational slipping without sacrificing productivity in an electric motor rotor in which a fastening material is filled between an outer core and an inner core. The rotor of the internal-rotation type motor has two or more protrusions facing each other on the inner peripheral side of the outer core and the inner peripheral side of the inner core, and the outer core protrusion, the inner core protrusion, or these There has been proposed a rotor of an electric motor in which both axial end portions of both protrusions are covered with a fastening material (see, for example, Patent Document 2).

Furthermore, in order to provide a rotor for an electric motor that has a simple vibration isolation structure and is easy to assemble, four second ribs are formed in parallel with the rotation axis from the outer peripheral surface of the core toward the first rib. . The first rib and the second rib are opposed to each other with a gap therebetween, and a columnar anti-vibration rubber is disposed in parallel to the rotation axis. A first groove having an arcuate cross section is provided at the tip of the first rib so as to correspond to the circumference of the anti-vibration rubber in parallel with the rotation axis. Similarly, a second groove is provided at the tip of the second rib. Anti-vibration rubber is disposed in contact with the first groove and the second groove. Insert a cylindrical fixing pin with an outer diameter that is slightly larger than the inner diameter of the anti-vibration rubber and slightly smaller than the outer diameter of the anti-vibration rubber into the anti-vibration rubber. There has been proposed a rotor of an electric motor that presses the outer periphery of the motor and connects the permanent magnet and the core to each other (see, for example, Patent Document 3).
JP 2001-268831 A (page 3, FIG. 1) JP 2003-61279 (page 3, FIG. 1) JP 2002-354725 A (page 4, FIG. 1)

  However, the permanent magnet rotor proposed in Patent Document 1 is composed of a shaft and a ring-shaped rotor magnet, and a connecting portion filled with an elastic body such as rubber between the shaft and the rotor magnet. In order to improve the vibration-proof performance against rotational excitation force such as torque ripple and cogging torque, the hardness of an elastic body such as rubber has been reduced, that is, softened. Therefore, since the permanent magnet rotor is also softened in the radial direction at the same time, noise may be generated due to the magnetic attracting force in the radial direction and the external force applied to the shaft, and the efficiency may be reduced due to the eccentricity of the gap. Therefore, a plurality of protrusions are provided on the outer periphery of the shaft and the inner periphery of the rotor magnet so that the protrusions are close to and face each other, and rubber is filled between the adjacent protrusions so that the structure is hardened in the radial direction. However, when the hardness of an elastic body such as rubber is made small and soft in order to enhance the vibration isolation effect in the rotational direction, it is necessary to make the gap between the projections very small. Productivity such as difficulty in filling the gaps between elastic bodies such as rubber becomes an issue. Further, since the adjustment elements for the vibration isolation performance in the rotational direction and the radial direction are only the hardness of the elastic body such as rubber and the interval between the protrusions, there is a problem that the adjustment range is narrow.

  The present invention has been made to solve the above-described problems, and aims to reduce noise, improve productivity, and reduce costs of the rotor and the motor and the air conditioner of the motor. Moreover, it aims at the productivity improvement and cost reduction of the manufacturing method of the rotor of an electric motor.

  The rotor of the electric motor according to the present invention is a rotation formed by integrally molding a shaft, a main magnet, and a position detection magnet disposed in the vicinity of one axial end surface of the main magnet with a thermoplastic resin. A connecting portion composed of an elastic body filled between the child magnet, the shaft, and the rotor magnet, and a ring-shaped partition material that divides the connecting portion in multiple layers in the radial direction. To do.

  The rotor of the electric motor according to the present invention is provided with a ring-shaped partition material that divides the connecting portion into multiple layers in the radial direction, so that it becomes soft in the rotational direction and hard in the radial direction while maintaining vibration-proof performance, and magnetic attraction The influence of force can be suppressed and noise can be reduced.

Embodiment 1 FIG.
1 to 6 are diagrams showing the first embodiment, and FIG. 1 is a diagram showing a configuration of a rotor 100 of an electric motor ((a) is a cross-sectional view taken along line AA of (b), and (b) is a side view). 2 is a diagram showing the configuration of the rotor magnet 5 ((a) is a sectional view taken along line BB of (b), (b) is a side view), and FIG. 3 is a diagram showing the configuration of the main magnet 6 ((a ) Is a side view, FIG. 4B is a cross-sectional view taken along the line CC in FIG. 4A, FIG. 4 is a diagram showing the configuration of the position detecting magnet 7, FIG. (C) is a right side view), FIG. 5 is a perspective view of the partition member 14, and FIG. 6 is a diagram showing a configuration of a rotor 100 of a motor according to a modification ((a) is a diagram of (b)). It is EE sectional drawing, (b) is a side view.

  As shown in FIG. 1, a rotor 100 of an electric motor includes a shaft 1, a rotor magnet 5, and a ring-shaped partition member 14 that are integrally formed with an elastic body 17 (an example of a connecting portion) such as rubber. Yes.

  The shaft 1 has an outer diameter, the partition member 14 has protrusions 16 on both end faces (four on one side, a total of eight in the example of FIG. 1), and the rotor magnet 5 is set in a mold with the outer diameter positioned, and is elastic such as rubber. The body 17 is injected and molded integrally. The protrusion 16 may be provided only on one end surface of the partition member 14.

  The elastic body 17 such as rubber is injected from both the outer diameter side and the outer side of the partition member 14, and the elastic body 17 such as rubber is partitioned by the partition member 14 and has two layers in the radial direction.

  The outer periphery of the shaft 1 is molded with a thermoplastic resin 3 so as to cover the knurl 2 and is prevented from rotating by the knurl 2. The convex part 4 is provided in the outer periphery of the thermoplastic resin 3, and becomes a rotation stop with elastic bodies 17, such as rubber | gum. The convex portion 4 is formed in the vicinity of the substantially central portion in the axial direction of the rotor 100 of the electric motor on the outer periphery of the thermoplastic resin 3.

  Knurl means a jagged shape in French and is called knurling in English. It is generally called knurling at the manufacturing site in Japan, and it plays a role as an anti-slip mainly on the outer periphery of the round object. It is mainly used as a detent to prevent slipping by increasing the coefficient of friction at the connection part of the press-fitted parts (insert) or by causing the inner diameter of the joint to bite.

  Further, since the elastic body 17 such as rubber is formed so as to cover both end faces of the convex portion 4 of the thermoplastic resin 3, the convex portion 4 also serves to prevent the axial portion from coming off.

  The ring-shaped partition member 14 is also formed with convex portions 15 that partially extend in the axial direction on the inner peripheral surface and the outer peripheral surface. The convex portion 15 is prevented from rotating and prevented from coming off (see FIG. 5).

  In the rotor magnet 5, a convex portion 9 extending in the axial direction on the inner peripheral surface of the thermoplastic resin 8 is partially formed in a substantially axial central portion. The convex portion 9 is prevented from rotating and retained (see FIG. 2).

  Further, since the rotor magnet 5 is integrally formed with an elastic body 17 such as rubber so as to sandwich the both end faces, axial vibration is suppressed.

  As shown in FIG. 2, the rotor magnet 5 is disposed in the vicinity of one end in the axial direction of the main magnet 6, which is pole-oriented and formed of a plastic magnet and emits a main magnetic flux. The position detecting magnet 7 is integrally formed with a thermoplastic resin 8. As already described, the convex portion 9 extending in the axial direction on the inner peripheral surface of the thermoplastic resin 8 is partially formed in the substantially central portion in the axial direction (the example of FIG. 2 has four convex portions 9. ).

  As shown in FIG. 3, the main magnet 6 that is polar-oriented and formed of a plastic magnet has a plurality of (eight in FIG. 3) recesses 10 that penetrate in the axial direction on the inner diameter side, and an axial end surface on one side. A plurality of pedestals 11 are provided. The number of pedestals 11 is less than that of the recesses 10 (four in FIG. 3), and the recesses 10 penetrate the pedestals 11 as well. The pedestal 11 becomes an installation surface of the position detection magnet 7. Further, the convex portion 12 (see FIG. 4) of the position detecting magnet 7 is fitted into the concave portion 10 provided in the base 11, and the position detecting magnet 7 is positioned. The recess 10 is filled with the thermoplastic resin 8 to prevent rotation.

  As shown in FIG. 4, the position detecting magnet 7 has a plurality of (four in the example of FIG. 4) convex portions 12 formed on one axial end face. Further, a step 13 is provided on the inner diameter side of the other axial end face. The convex portion 12 is fitted into the concave portion 10 (see FIG. 3) of the pedestal 11 of the main magnet 6 so as to prevent rotation. The step 13 is filled with the thermoplastic resin 8 and is prevented from coming off in the axial direction.

  The main magnet 6 and the position detection magnet 7 are configured such that the concave portion 10 of the main magnet 6 and the convex portion 12 of the position detection magnet 7 are fitted together, and one end face of the position detection magnet 7 extends to the base 11 of the main magnet 6. Inserted to touch. Then, the rotor magnet 5 is formed integrally with the thermoplastic resin 8 so as to cover the inner diameter end face of the position detecting magnet 7 and a part of the other end face of the main magnet 6. At this time, a convex portion 9 is formed on the thermoplastic resin 8 on the inner diameter of the rotor magnet 5. By integrally forming the thermoplastic resin 8 so as to cover the step 13 on the inner diameter side of the position detection magnet 7 and the end surface of the main magnet 6, the position detection magnet 7 and the main magnet 6 can be prevented from coming off in the axial direction. Become.

  The partition material 14 shown in FIG. 5 is formed using a thermoplastic resin. The partition member 14 includes a plurality of convex portions 15 (four in each of the inner and outer peripheral surfaces in the example of FIG. 5) partially extending in the axial direction on the inner and outer peripheral surfaces. In addition, a plurality of projections 16 (four on one side in the example of FIG. 5) are provided on both end surfaces in the axial direction. Of the partition member 14, the convex portion 15 on the outer peripheral surface is prevented from rotating or coming off with respect to an elastic body 17 such as rubber. Further, the protrusions 16 formed on both end surfaces in the axial direction serve as positioning when the partition member 14 is inserted into a molding die of an elastic body 17 such as rubber.

  An elastic body 17 such as rubber filled between the shaft 1 and the rotor magnet 5 is partitioned by a partition member 14 and has two layers in the radial direction. By forming the elastic body 17 such as rubber in two layers in the radial direction by the partition member 14, the spring constant in the radial direction is suppressed while suppressing a change in the spring constant in the rotational direction as compared with the case where the elastic body 17 such as rubber is one layer. Can be increased. In other words, it is soft in the rotational direction and hardened in the radial direction while maintaining the vibration-proof performance, so that the influence of the magnetic attractive force can be suppressed and noise can be reduced.

  In this embodiment, as an example, the partition material 14 formed of a thermoplastic resin is used, but a metal partition material 14 may be used. Regardless of the manufacturing method, the same effect can be obtained by using the partition material 14 having a higher rigidity than the elastic body 17 such as rubber.

  The main magnet 6 is polar-oriented and molded with a plastic magnet. However, a sintered magnet, a back yoke in which electromagnetic steel plates are laminated on a magnetic path, or a back yoke in which a thermoplastic resin mixed with a soft magnetic material is molded. You may use what has arrange | positioned the plastic magnet or the sintered magnet in the outer periphery.

  Regardless of the material and fixing method of the rotor magnet 5, the same effect can be obtained by dividing the elastic body 17 such as rubber filled between the shaft 1 and the rotor magnet 5 in the radial direction by the partition member 14. Needless to say.

  Moreover, although the example which uses the rotor magnet 5 which integrally molded the main magnet 6 and the position detection magnet 7 with the thermoplastic resin 8 as shown in FIG. 2 was shown, as shown in FIG. The rotor magnet 5 in which the ring-shaped partition member 14 is integrally formed may be used at the same time that the position detecting magnet 7 and the shaft 1 are integrally formed with the thermoplastic resin 8. The main magnet 6, the position detecting magnet 7, the ring-shaped partition member 14, and the shaft 1 are integrally formed by the connecting portion 18 provided on the end surface.

  This rotor magnet 5 is inserted into a mold for molding an elastic body 17 such as rubber. An elastic body 17 such as rubber is molded, and then the connecting portion 18 is cut or excised to obtain the rotor 100 of the electric motor shown in FIG. By doing in this way, the elastic material 17 such as rubber becomes two layers by the partition material 14, and not only the same effect can be obtained, but also the molding process can be omitted, and the productivity can be improved and the cost can be reduced. .

Embodiment 2. FIG.
7 to 10 are diagrams showing the second embodiment, and FIG. 7 is a diagram showing the configuration of the rotor 100 of the motor ((a) is a sectional view taken along line FF in (b), and (b) is a side view). 8 is a perspective view of the partition member 19, FIG. 9 is a diagram showing the configuration of the rotor 100 of the electric motor ((a) is a sectional view taken along line GG of (b), (b) is a side view), and FIG. 3 is a perspective view of a partition member 21. FIG.

  The rotor 100 of the electric motor shown in FIG. 7 is the same as the rotor 100 of the electric motor of FIG.

  As shown in FIG. 8, the ring-shaped partition member 19 is provided with a plurality of (three in the example of FIG. 8) holes 20 (an example of an opening) that are continuous in the axial direction at four locations in the circumferential direction. (12 total). A plurality of projections 16 (four on one side in the example of FIG. 8) are provided on both end faces.

  The plurality of holes 20 are for flowing an elastic body 17 such as rubber to the outer peripheral side of the partition member 19. Filling the plurality of holes 20 of the partition member 19 with an elastic body 17 such as rubber also prevents the partition member 19 from rotating and coming off.

  Further, the protrusions 16 on both end faces are positioned when the partition member 19 is inserted into a molding die of an elastic body 17 such as rubber.

  As shown in FIG. 7, the shaft 1 whose outer periphery is molded with the thermoplastic resin 3 and the convex portion 4 is provided on the thermoplastic resin 3, the rotor magnet 5, and the ring-shaped partition member 19 are made of rubber or the like. The elastic body 17 is integrally formed.

  The shaft 1 has an outer diameter, the partition member 19 has protrusions 16 on both end faces, and the rotor magnet 5 is positioned on the outer diameter and is set in a mold, and an elastic body 17 such as rubber is injected, so that the rotor 100 of the electric motor is integrated. Molded. The elastic body 17 such as rubber is injected from either the outer peripheral side of the ring-shaped partition member 19, and the elastic body 17 such as rubber is partitioned by the ring-shaped partition member 19, and is divided into two layers in the radial direction. Become.

  The protrusion 4 on the outer periphery of the shaft 1 and the protrusion 9 provided on the inner diameter of the rotor magnet 5 prevent the elastic body 17 such as rubber from rotating and coming off.

  Further, since the rotor magnet 5 is formed of an elastic body 17 such as rubber so as to sandwich both end faces, axial shake is suppressed. Since the ring-shaped partition member 19 is provided with a plurality of holes 20 penetrating in the side surface, the elastic body 17 such as rubber is injected by injecting the elastic body 17 such as rubber from either the inner side or the outer peripheral side. Can be filled. Further, by filling the elastic body 17 such as rubber, the plurality of holes 20 of the partition member 19 are prevented from rotating and retained.

  The ring-shaped partition member 19 of the present embodiment is obtained by providing a plurality of holes in the ring-shaped partition member 14 of the first embodiment. By providing a plurality of holes, it becomes possible to fill the elastic body 17 such as rubber by injecting the elastic body 17 such as rubber from either the outer peripheral side or the inside of the partition material 19. The number of gates to be reduced can be reduced, and the mold is simplified. Further, productivity can be improved and the cost is reduced.

  Although the ring-shaped partition member 19 provided with a plurality of holes has been described as an example of the present embodiment, a plurality of notches 22 (an example of an opening) are provided as shown in FIGS. The same effect can be obtained even when the ring-shaped partition member 21 is used. In the example of FIG. 10, the notches 22 are given a predetermined length in the axial direction and are provided at four locations in the circumferential direction.

  When the partition member 21 provided with a plurality of notches 22 shown in FIG. 10 is used, the shaft 1 and the rotor magnet 5 are integrally formed with an elastic body 17 such as rubber, and then a thermoplastic resin is formed. It is also possible to mold the ring-shaped partition member 21 by pouring. At the time of molding with an elastic body 17 such as rubber, a portion having the same shape as the partition material 21 is provided in the molding die. After molding with an elastic body 17 such as rubber, a cavity having the same shape as the partition material 21 is formed. A thermoplastic resin is injected into the cavity to form a ring-shaped partition member 21. The advantage of this method is to eliminate a gap generated between the rotor magnet 5 and the elastic body 17 such as rubber due to the pressure of the thermoplastic resin when the partition member 21 is molded. By eliminating the gap between the rotor magnet 5 and the elastic body 17 such as rubber, there is an effect in terms of vibration and noise.

  Further, as in the first embodiment, the partition member 19 and the partition member 21 may be made of metal. Regardless of the manufacturing method, the same effect can be obtained by making the partition member 19 and the partition member 21 a material having higher rigidity than the elastic body 17 such as rubber.

Embodiment 3 FIG.
11 and 12 are diagrams showing the third embodiment, and FIG. 11 is a diagram showing a configuration of the rotor 100 of the electric motor ((a) is a cross-sectional view taken along line HH in (b), and (b) is a side view). FIG. 12 is a perspective view of the partition member 23.

  The ring-shaped partition member 23 shown in FIG. 12 has a plurality of cutouts 22 (the same as the cutouts 22 in FIG. 10) with a predetermined length in the axial direction and provided at four locations in the circumferential direction. Further, flanges 24 are formed on both end surfaces in the axial direction.

  The plurality of cutouts 22 are for flowing an elastic body 17 such as rubber to the outer peripheral side of the partition member 23, and are also prevented from rotating and coming off when filled with the elastic body 17 such as rubber.

  Further, since the flanges 24 on both end surfaces are formed so as to suppress both end surfaces of the elastic body 17 such as rubber, it is possible to further suppress axial deflection.

  As shown in FIG. 11, the outer periphery is molded with a thermoplastic resin 3, and the shaft 1 on which the convex portion 4 is provided on the thermoplastic resin 3 and the rotor magnet 5 are integrally molded with an elastic body 17 such as rubber. ing.

  The shaft 1 is positioned on the outer diameter, and the rotor magnet 5 is positioned on the outer diameter. The elastic body 17 such as rubber is injected and molded integrally. The elastic body 17 such as rubber is injected by a mold configured so that the shape of the partition member 23 provided with a plurality of notches 22 and flanges 24 on the end faces is hollow. A ring-shaped member in which an elastic body 17 such as rubber is integrated into a partition molding die, thermoplastic resin is injected into the cavity, a plurality of notches 22 are provided on the side surface, and a flange 24 is provided on the end surface. The partitioning material 23 is formed, and the elastic body 17 such as rubber is partitioned by the partitioning material 23, so that two layers are formed in the radial direction.

  The convex part 4 on the outer periphery of the shaft 1 and the convex part 9 provided on the inner diameter of the rotor magnet 5 prevent or come off from an elastic body 17 such as rubber.

  The rotor magnet 5 is formed of an elastic body 17 such as rubber so that both end faces are sandwiched, and the flange 24 of the partition member 23 is formed so as to sandwich both end faces of the elastic body 17 such as rubber. Can be further suppressed. The plurality of notches 22 provided in the partition member 23 prevent rotation and come off.

  The partition member 23 according to the present embodiment is a ring-shaped member having a plurality of notches 22 and flanges 24 provided at both end faces instead of the partition member 21 having the plurality of notches 22 of the second embodiment. The partition material 23 is used. Since the rotor magnet 5 is configured to be sandwiched between the flanges 24 between both ends of an elastic body 17 such as rubber and a partition material 23 formed of a thermoplastic resin, axial vibration is further suppressed and noise is reduced. Can be achieved.

Embodiment 4 FIG.
FIGS. 13 to 16 are diagrams showing the fourth embodiment, and FIG. 13 is a diagram showing a configuration of the rotor 100 of the electric motor ((a) is a sectional view taken along the line KK in (b), and (b) is a side view). 14 is a perspective view of the partition member 27, FIG. 15 is a diagram showing the configuration of the rotor 100 of the electric motor ((a) is an LL sectional view of (b), (b) is a side view), and FIG. 3 is a perspective view of a partition member 27. FIG.

  A partition member 27 shown in FIG. 14 includes a ring-shaped first partition member 25 provided with a plurality of notches 22 (the same as FIG. 10) and a ring-shaped second partition member provided with a plurality of notches 22. And material 26. The 1st partition material 25 and the 2nd partition material 26 are isolate | separated, and the some notch 22 is provided, respectively.

  The notch 22 is for flowing an elastic body 17 such as rubber on the outer peripheral side of the first partition member 25 and the second partition member 26, and prevents rotation when the elastic body 17 such as rubber is filled. It will also prevent you from coming off.

  Further, the protrusions 16 on both end faces are positioned when the partition member 27 is inserted into a molding die of an elastic body 17 such as rubber. When positioned, the first partition member 25 and the second partition member 26 are arranged concentrically.

  As shown in FIG. 13, the shaft 1 whose outer periphery is molded with the thermoplastic resin 3 and the convex portion 4 is provided on the thermoplastic resin 3, the rotor magnet 5, the two first partition members 25, the second The partition member 26 is integrally formed of an elastic body 17 such as rubber.

  The shaft 1 is positioned with an outer diameter, and the rotor magnet 5 is positioned with an outer diameter. The two first partition members 25 and the second partition member 26 are positioned by the projections 16 on both end faces and set concentrically in a mold, and are molded integrally by injecting an elastic body 17 such as rubber. The

  The elastic body 17 such as rubber is injected from one of the first partition member 25 and the second partition member 26 on the outer peripheral side. The convex portion 4 on the outer periphery of the shaft 1 and the convex portion 9 provided on the inner diameter of the rotor magnet 5 prevent rotation with respect to an elastic body 17 such as rubber, and prevent it from coming off. Further, since the rotor magnet 5 is formed of an elastic body 17 such as rubber so as to sandwich both end faces, axial shake is suppressed.

  The first partition member 25 and the second partition member 26 are provided with a plurality of notches 22, and an elastic body 17 such as rubber is injected by injecting an elastic body 17 such as rubber from either the inner side or the outer peripheral side. 17, and the elastic body 17 such as rubber is partitioned in the radial direction by the first partition member 25 and the second partition member 26 to form three layers.

  In addition, by filling the elastic body 17 such as rubber, the plurality of notches 22 of the first partition member 25 and the second partition member 26 are prevented from rotating and coming off.

  The partition material 27 of this embodiment arranges two first partition materials 25 and second partition materials 26 provided with the same notches 22 as the partition material 14 of the second embodiment, in a concentric manner, An elastic body 17 such as rubber filled between the shaft 1 and the rotor magnet 5 is formed in three layers in the radial direction.

  In this way, the first partition member 25 and the second partition member 26 have three layers of elastic bodies 17 such as rubber in the radial direction, so that the springs in the rotational direction are compared with the two layers in the second embodiment. The spring constant in the radial direction can be further increased while suppressing changes in the constant. That is, it is soft in the rotational direction and harder in the radial direction while maintaining the vibration isolating performance, and the influence of the magnetic attractive force can be suppressed, and noise can be further reduced.

  As an example of the present embodiment, an electric motor in which two first partition members 25 and a second partition member 26 provided with a plurality of notches 22 are arranged concentrically and an elastic body 17 such as rubber is formed in three layers. Although the rotor 100 is shown, three or more ring-shaped partition members are arranged concentrically, and the elastic body 17 such as rubber is formed in a multi-layer, thereby suppressing a change in the spring constant in the rotation direction. Needless to say, the radial spring constant can be further increased.

  Further, as shown in FIGS. 15 and 16, the first partition member 25 and the second partition member 26 arranged concentrically may be connected by a connecting portion 28 to form one partition member 27. Similar effects can be obtained.

  A partition member 27 shown in FIG. 16 is arranged concentrically, and includes a plurality of first partition members 25 and second partition members 26 each having a plurality of notches 22 provided on one or both axial end faces. The connecting portion 28 is integrated. The connecting portion 28 formed on the end surface also serves as a positioning to the mold.

  After the elastic body 17 such as rubber is molded and integrated, the first partition member 25 and the second partition member 26 arranged concentrically by cutting the connecting portion 28 may be separated.

  13 to 16, since the partition member 27 has a plurality of notches 22, the shaft 1 and the rotor magnet 5 are integrally formed of an elastic body such as rubber, and then a thermoplastic resin is injected. A ring-shaped partition member 27 can be formed. This has been described in the second embodiment.

Embodiment 5. FIG.
FIG. 17 is a diagram illustrating the fifth embodiment, and is a diagram illustrating a manufacturing process of the rotor 100 of the electric motor.

An example of the manufacturing process of the rotor 100 of the electric motor will be described with reference to FIG.
(1) Step 1: The main magnet 6 is polar-oriented and molded with a plastic magnet. In parallel, the position detecting magnet 7 is formed.
(2) Step 2: The main magnet 6 is demagnetized. In parallel, the position detection magnet 7 is demagnetized.
(3) Step 3: The main magnet 6 and the position detection magnet 7 are integrally molded with the thermoplastic resin 8 to form the rotor magnet 5. In parallel, the ring-shaped partition member 14 is molded using a thermoplastic resin. In parallel, the processed shaft 1 is molded with the thermoplastic resin 3 so as to cover the knurl 2 on the outer periphery of the shaft 1.
(4) Step 4: The shaft 1, the rotor magnet 5, and the ring-shaped partitioning material 14 are set in a mold.
(5) Step 5: The shaft 1, the rotor magnet 5, and the ring-shaped partitioning material 14 set in the mold are integrally formed with an elastic body 17 such as rubber.
(6) Step 6: The rotor magnet 5 is magnetized.
(7) Step 7: Assemble the bearing 31 (see FIG. 18) on the shaft 1.

  By manufacturing the rotor 100 of the electric motor by the manufacturing process as described above, the rotor 100 of the electric motor can be efficiently manufactured.

Embodiment 6 FIG.
FIG. 18 is a cross-sectional view of the electric motor 200 according to the sixth embodiment.

  As shown in FIG. 18, the electric motor 200 includes a stator 29, the rotor 100 of the electric motor according to any one of the first to fifth embodiments, a bearing 31, and a bracket 32.

  As shown in FIG. 18, two bearings 31 are press-fitted and fixed to the shaft 1 of the rotor 100 of the electric motor according to any one of the first to fifth embodiments. At this time, the bearing 31 is press-fitted and fixed until it hits both end faces of the thermoplastic resin 3 formed integrally with the shaft 1. The rotor 100 of the electric motor to which the bearing 31 is attached is inserted into the space inside the stator 29. The bracket 32 is press-fitted into the stator 29 so that the two bearings 31 are held by the stator 29 and the bracket 32, and the electric motor 200 is completed.

  By using the rotor 100 of the electric motor according to any one of the first to fifth embodiments, the quality of the electric motor 200 is improved (particularly in terms of noise). Further, productivity can be improved and manufacturing cost can be reduced.

Embodiment 7 FIG.
FIG. 19 is a diagram illustrating the seventh embodiment, and is a configuration diagram of the air conditioner 300.

  As shown in FIG. 19, the air conditioner 300 includes an indoor unit 33 and an outdoor unit 34. The indoor unit 33 is connected to the outdoor unit 34. The indoor unit 33 and the outdoor unit 34 include a blower 35. And the electric motor 200 of Embodiment 6 is mounted in the air blower 35 as an electric motor for air blowers.

  The air conditioner 300 in recent years has been reduced in noise, and it is preferable to use the electric motor 200 of Embodiment 6 as a blower motor that is a main part of the air conditioner 300.

  By using the electric motor 200 of Embodiment 6 as the electric motor for a blower that is a main part of the air conditioner 300, the quality of the blower 35 of the air conditioner 300 is improved (mainly noise reduction). Further, productivity can be improved and manufacturing cost can be reduced.

FIG. 3 shows the first embodiment and is a diagram showing a configuration of a rotor 100 of an electric motor ((a) is a cross-sectional view taken along line AA of (b), and (b) is a side view). FIG. 3 is a diagram illustrating the first embodiment and is a diagram illustrating a configuration of a rotor magnet 5 ((a) is a cross-sectional view taken along line BB of (b), and (b) is a side view). FIG. 3 is a diagram showing the first embodiment, and is a diagram showing a configuration of a main magnet 6 ((a) is a side view, and (b) is a cross-sectional view taken along the line CC in (a)). FIG. 3 is a diagram illustrating the first embodiment, and is a diagram illustrating a configuration of a position detection magnet 7 ((a) is a left side view, (b) is a DD sectional view of (a), and (c) is a right side view). . FIG. 5 shows the first embodiment, and is a perspective view of a partition member 14. FIG. 5 shows the first embodiment, and is a diagram showing a configuration of a rotor 100 of a motor according to a modification ((a) is a cross-sectional view taken along line EE of (b), and (b) is a side view). It is a figure which shows Embodiment 2, and is a figure which shows the structure of the rotor 100 of an electric motor ((a) is FF sectional drawing of (b), (b) is a side view). FIG. 6 is a diagram showing the second embodiment, and is a perspective view of a partition member 19. It is a figure which shows Embodiment 2, and the figure which shows the structure of the rotor 100 of an electric motor ((a) is GG sectional drawing of (b), (b) is a side view). FIG. 5 shows the second embodiment and is a perspective view of a partition member 21. FIG. It is a figure which shows Embodiment 3, The figure which shows the structure of the rotor 100 of an electric motor ((a) is HH sectional drawing of (b), (b) is a side view). FIG. 10 shows the third embodiment, and is a perspective view of a partition member 23. It is a figure which shows Embodiment 4, and the figure which shows the structure of the rotor 100 of an electric motor ((a) is KK sectional drawing of (b), (b) is a side view). FIG. 10 is a diagram illustrating the fourth embodiment, and is a perspective view of a partition member 27. It is a figure which shows Embodiment 4, and the figure which shows the structure of the rotor 100 of an electric motor ((a) is LL sectional drawing of (b), (b) is a side view). FIG. 10 is a diagram illustrating the fourth embodiment, and is a perspective view of a partition member 27. FIG. 9 shows the fifth embodiment and shows the manufacturing process of the rotor 100 of the electric motor. FIG. 10 shows the sixth embodiment and is a cross-sectional view of the electric motor 200. FIG. 12 shows the seventh embodiment and is a configuration diagram of an air conditioner 300.

Explanation of symbols

  1 axis, 2 knurls, 3 thermoplastic resin, 4 convex part, 5 rotor magnet, 6 main magnet, 7 position detecting magnet, 8 thermoplastic resin, 9 convex part, 10 concave part, 11 pedestal, 12 convex part, 13 Step, 14 Partition material, 15 Convex portion, 16 Protrusion, 17 Elastic body such as rubber, 18 Connecting portion, 19 Partition material, 20 Hole, 21 Partition material, 22 Notch, 23 Partition material, 24 Flange, 25 First Partition material, 26 Second partition material, 27 Partition material, 28 Connecting portion, 29 Stator, 31 Bearing, 32 Bracket, 33 Indoor unit, 34 Outdoor unit, 35 Blower, 100 Motor rotor, 200 Motor, 300 Air Harmony machine.

Claims (12)

The axis,
A rotor magnet configured by integrally molding a main magnet and a position detection magnet disposed in the vicinity of one axial end surface of the main magnet with a thermoplastic resin;
A connecting portion composed of an elastic body filled between the shaft and the rotor magnet;
An electric motor rotor comprising: a ring-shaped partition member that divides the connecting portion in multiple layers in the radial direction.   The electric motor rotor according to claim 1, wherein the partition member is made of metal.   The electric motor rotor according to claim 1, wherein the partition member is made of a thermoplastic resin.   4. The electric motor rotor according to claim 1, wherein the partition member has an opening that allows the outer peripheral surface and the inner peripheral surface to communicate with each other. 5.   The rotor of an electric motor according to claim 4, wherein the opening is configured by a hole or a notch.   The rotor of an electric motor according to any one of claims 1 to 5, wherein the partition member is provided with a projection on the end face in at least one axial direction for positioning the connecting portion to a molding die.   The rotor of an electric motor according to any one of claims 1 to 6, wherein the connecting portion is formed so as to sandwich both axial end surfaces of the rotor magnet.   The rotor of an electric motor according to any one of claims 1 to 7, wherein the rotor magnet is formed with a convex portion extending in an axial direction on an inner peripheral surface of the thermoplastic resin.   The shaft is formed of a thermoplastic resin so as to cover an outer periphery of the shaft, and a convex portion is provided on the outer periphery of the thermoplastic resin to prevent rotation with the connecting portion. The rotor of the electric motor in any one of 8.   An electric motor using the rotor of the electric motor according to claim 1.   An air conditioner using the electric motor according to claim 10 as an electric motor for a blower. The manufacturing method of the rotor of the electric motor characterized by including the following processes.
(1) A first step in which a main magnet is pole-oriented and molded with a plastic magnet, and a position detecting magnet is molded in parallel;
(2) a second step of demagnetizing the main magnet and the position detecting magnet;
(3) The main magnet and the position detection magnet are integrally molded with a thermoplastic resin to form a rotor magnet, and a ring-shaped partition member is molded with the thermoplastic resin in parallel. A third step of molding the processed shaft with a thermoplastic resin so as to cover the outer periphery of the shaft;
(4) a fourth step of setting the shaft, the rotor magnet, and the partition member in a mold;
(5) A fifth step of integrally forming the shaft set in the mold, the rotor magnet, and the partition member at a connecting portion;
(6) A sixth step of magnetizing the rotor magnet;
(7) A seventh step of assembling a bearing to the shaft.