JP6373505B2 - Electric motor and air conditioner - Google Patents

Description

  The present invention relates to an electric motor and an air conditioner including the electric motor.

  A conventional rotor that uses a rotor core to form a magnetic path is formed by integrally forming a rotor core provided with a permanent magnet and a shaft disposed along the central axis of the rotor core with a thermoplastic resin. There is something that is configured as.

  In the rotor described in Patent Document 1, the first steel plate having the first hole and the second steel plate having the second hole larger than the first hole are alternately stacked and A resin filling hole is formed by communicating the second hole in the axial direction, and the resin filling hole is filled with resin.

Japanese Patent Laying-Open No. 2015-33167

  However, when the permanent magnet, the shaft, and the rotor core are integrally formed of a thermoplastic resin as in the conventional rotor, the thermoplastic resin is different due to the difference in coefficient of linear expansion between the rotor core and the thermoplastic resin. May peel from the rotor core, and the quality of the motor may be reduced. In addition, when a gap is generated between the thermoplastic resin and the rotor core due to the shrinkage of the thermoplastic resin, the gap causes noise during the rotation of the rotor.

  On the other hand, in the rotor described in Patent Document 1, in order to ensure the rigidity of the rotor, resin is filled in a resin filling hole provided in the rotor core. In this configuration, two types of steel plates are used. This increases the number of molds required for the production of steel sheets, necessitates new lamination equipment and setup, and increases costs.

  This invention is made | formed in view of the above, Comprising: It aims at providing the electric motor which can aim at cost reduction, noise reduction, and quality improvement.

  In order to solve the above-described problems and achieve the object, an electric motor according to the present invention includes an annular stator and a rotor disposed inside the stator, and the rotor is the rotor. A shaft having an outer peripheral surface that is coaxial with the rotation axis, an inner peripheral surface that is disposed coaxially with the shaft, has a diameter larger than the diameter of the outer peripheral surface of the shaft, and an outer peripheral surface that faces the stator. An annular rotor core having a groove extending in the direction of the rotation axis on the inner peripheral surface, at least one permanent magnet fixed to the rotor core, and an outer peripheral surface of the shaft that is integrally formed with resin An inner cylinder portion arranged on the outer peripheral portion of the rotor core, a rib portion connecting the inner cylinder portion and the outer cylinder portion in the radial direction of the rotor core, and Connected to the outer cylinder and formed from the resin filled in the groove And a connecting part having a filling unit, a was.

  According to the present invention, it is possible to achieve cost reduction, noise reduction, and quality improvement.

The perspective view which shows the structure of the rotor which concerns on Embodiment 1. FIG. FIG. 3 is a plan view showing the configuration of the rotor according to the first embodiment. Side view showing the configuration of the rotor according to the first embodiment. AA arrow sectional view in FIG. BB arrow sectional view in FIG. CC sectional view in FIG. Partial enlarged view of FIG. The figure for demonstrating the shape of the filling part in Embodiment 1. FIG. The perspective view which shows the structure of the rotor at the time of removing the position detection magnet in Embodiment 1. FIG. The perspective view of the position detection magnet in Embodiment 1 Side view of position detection magnet in embodiment 1 Front view of position detecting magnet according to Embodiment 1 The perspective view which shows the structure of the rotor assembly which concerns on Embodiment 1. FIG. Side view showing the configuration of the stator in the first embodiment. FIG. 3 is a plan view showing the configuration of the stator in the first embodiment. The perspective view which shows the structure of the mold stator in Embodiment 1. FIG. The perspective view which shows the structure of the mold motor which is an electric motor which concerns on Embodiment 1. FIG. The side view which shows the structure of the mold motor which is an electric motor which concerns on Embodiment 1. FIG. The perspective view which shows the structure of the rotor which concerns on Embodiment 2. FIG. FIG. 5 is a plan view showing the configuration of the rotor according to the second embodiment. Side view showing the configuration of the rotor according to the second embodiment. EE arrow sectional view in FIG. FF arrow sectional drawing in FIG. GG arrow sectional view in FIG. The perspective view which shows the structure of the rotor at the time of removing the position detection magnet in Embodiment 2. FIG. Partial enlarged view of FIG. Illustration for explaining FIG. The figure which shows an example of a structure of the air conditioner which concerns on Embodiment 3.

  Hereinafter, an electric motor and an air conditioner according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a configuration of a rotor according to the present embodiment, FIG. 2 is a plan view showing a configuration of the rotor according to the present embodiment, and FIG. 3 is a rotor according to the present embodiment. 4 is a sectional view taken along the line AA in FIG. 2, FIG. 5 is a sectional view taken along the line BB in FIG. 3, and FIG. 6 is a sectional view taken along the line C-C in FIG. 7 is a partially enlarged view of FIG. 5, FIG. 8 is a view for explaining the shape of the filling portion, and FIG. 9 is a perspective view showing the configuration of the rotor when the position detection magnet is removed. 10 is a perspective view of the position detection magnet, FIG. 11 is a side view of the position detection magnet, and FIG. 12 is a front view of the position detection magnet. FIG. 2 is a plan view of the rotor as viewed from the position detection magnet side. FIG. 8 is a diagram corresponding to the portion D of FIG.

  As shown in FIGS. 1 to 4, the rotor 1 includes a shaft 2 having an outer peripheral surface that is coaxial with the rotation axis of the rotor 1, and is disposed coaxially with the shaft 2, and is larger than the diameter of the outer peripheral surface of the shaft 2. An annular rotor core 3 having an inner peripheral surface of a diameter; an annular magnet 4 provided on the outer peripheral surface of the rotor core 3; a connecting part 5 made of resin for connecting the shaft 2 and the rotor core 3; And an annular position detecting magnet 7 which is arranged coaxially with the rotor core 3 and attached to one end of the rotor core 3 in the axial direction.

  The shaft 2 has a central axis that is coaxial with the rotation axis. The rotor core 3 is configured by punching an electromagnetic steel sheet, caulking the punched electromagnetic steel sheet, and laminating it in the axial direction by welding or adhesion. The rotor core 3 is specifically cylindrical. The magnet 4 is a permanent magnet. The magnet 4 is fixed to the rotor core 3. The magnet 4 is a resin magnet containing at least one of rare earth magnet powder and ferrite powder, for example. The magnet 4 may be a sintered magnet. A plurality of magnetic poles are formed on the magnet 4 so that N poles and S poles are alternately arranged in the circumferential direction of the rotor core 3. Further, the axial length of the magnet 4 is, for example, the largest at the magnetic pole center and the smallest between the magnetic poles. A magnetic path of magnetic flux generated from the magnet 4 is formed in the rotor core 3. The magnet 4 is one annular permanent magnet, but may be composed of a plurality of permanent magnets arranged on the outer peripheral surface of the rotor core 3 and divided in the circumferential direction of the rotor core 3.

  The connecting component 5 has a rib portion 6 extending in the radial direction of the rotor core 3, and connects the shaft 2 and the rotor core 3 via the rib portion 6. In the following, “radial direction” means the radial direction of the rotor core 3. The number of the rib portions 6 is generally plural, and is five in the illustrated example. The plurality of rib portions 6 are arranged radially about the rotation axis, and are arranged, for example, at equal intervals in the circumferential direction of the rotor core 3. Further, the diameter of the inner peripheral surface of the rotor core 3 is larger than the diameter of the outer peripheral surface of the shaft 2, and a gap 8 is formed between adjacent rib portions 6. The connecting component 5 is made of, for example, a thermoplastic resin. The thermoplastic resin is, for example, polybutylene terephthalate. Details of the structure of the connecting component 5 will be described later.

  The position detection magnet 7 is a permanent magnet. The position detecting magnet 7 is a resin magnet containing at least one of rare earth magnetic powder and ferrite magnetic powder, for example. The position detection magnet 7 may be a sintered magnet. The position detection magnet 7 is magnetized in the same manner as the magnet 4. The position detection magnet 7 is attached to the rotor core 3 on the side opposite to the load side (not shown) connected to the shaft 2. As shown in FIGS. 10 to 12, the position detection magnet 7 includes a step portion 18 on the inner peripheral side of both axial end surfaces of the position detection magnet 7. Further, the step portion 18 is provided with a rib portion 19. A plurality of rib portions 19 are provided, and eight rib portions 19 are provided in the illustrated example. Thus, the position detecting magnet 7 is symmetrical in the axial direction, for example. The position detecting magnet 7 has stepped portions 18 on both end surfaces in the axial direction. However, the position detecting magnet 7 may be configured to have the stepped portions 18 on one end surface in the axial direction. Becomes asymmetric.

  Next, the details of the structure of the connecting component 5 will be described with reference to FIGS. The connecting component 5 is an inner cylindrical portion 10 that is a first cylindrical portion disposed on the outer peripheral surface 13 of the shaft 2 and a second cylindrical portion that is disposed on the inner peripheral surface 14 of the rotor core 3. The outer cylinder part 11, the rib part 6 that connects the inner cylinder part 10 and the outer cylinder part 11 in the radial direction, and the groove part 15 that is connected to the outer cylinder part 11 and formed on the inner peripheral surface 14 of the rotor core 3. And a filling portion 12 formed from a thermoplastic resin filled therein. Specifically, the inner cylinder part 10 and the outer cylinder part 11 are each cylindrical.

  Here, the groove 15 is formed on the inner peripheral surface 14, extends in the direction of the rotation axis, and penetrates the rotor core 3 in the axial direction. The groove 15 has a T shape when viewed in a cross section perpendicular to the rotation axis. Specifically, the groove portion 15 includes a groove portion 15a which is a first groove portion extending in the radial direction from the inner peripheral surface 14, and a groove portion which is a second groove portion communicating with the outer end in the radial direction of the groove portion 15a. 15b. Further, the groove portion 15a has a width L1 that is a first width in a direction orthogonal to the radial direction, and the groove portion 15b has a width L2 that is a second width larger than the width L1 in the same direction. The groove portion 15b extends on both sides of the groove portion 15a and in a direction perpendicular to the radial direction. The groove part 15b is symmetrical with respect to the groove part 15a.

  The number of the groove portions 15 is generally plural, and is 10 in the illustrated example. The plurality of grooves 15 are arranged, for example, at equal intervals in the circumferential direction of the rotor core 3. Further, the magnet 4 is arranged on the outer side in the radial direction than the arrangement position of the groove 15. The same applies to the position detection magnet 7.

  The filling portion 12 includes a filling portion 12a that is a first filling portion formed from a thermoplastic resin filled in the groove portion 15a, and a thermoplastic resin that is connected to the filling portion 12a and filled in the groove portion 15b. And a filling portion 12b which is a second filling portion formed from the above. That is, the filling portion 12a is made of a thermoplastic resin filled in the entire groove portion 15a, and is embedded in the groove portion 15a with the same shape and the same size as the groove portion 15a. Similarly, the filling portion 12b is made of a thermoplastic resin filled in the entire groove portion 15b, and has the same shape and the same size as the groove portion 15b and is embedded in the groove portion 15b. Therefore, the number of filling portions 12 is the same as the number of groove portions 15. Further, the length of the filling portion 12 in the direction of the rotation axis is equal to the length of the rotor core 3 in the same direction. The filling part 12 is formed of a thermoplastic resin integrally with the outer cylinder part 11, the rib part 6 and the inner cylinder part 10.

  Thus, the filling part 12 is T-shaped like the groove part 15 when viewed in a cross section perpendicular to the rotation axis. Therefore, the filling portion 12a has a width L1 in a direction orthogonal to the radial direction, and the filling portion 12b has a width L2 larger than the width L1 in the same direction.

  FIG. 13 is a perspective view showing the configuration of the rotor assembly according to the present embodiment. The rotor assembly 20 includes the rotor 1 and a pair of bearings 21 attached to the shaft 2. Here, the rotor 1 is integrally formed by setting the shaft 2, the rotor core 3 and the position detecting magnet 7 in a mold (not shown) and injecting a thermoplastic resin into the mold from a gate (not shown). Is. At this time, the connecting component 5 is also formed at the same time. Further, the gate is disposed inside the rotor core 3. As a result, the concentration of pressure at the time of molding is eased, the filling of the thermoplastic resin is facilitated, and the moldability can be improved. Further, by pressing the outer peripheral edge portions of the both end faces of the rotor core 3 with a mold and injecting a thermoplastic resin into the mold, burrs generated at the outer peripheral edge portion are suppressed, and deburring work is omitted. The productivity and quality of the rotor 1 can be improved.

  The thermoplastic resin is filled into the groove 15 through the inner cylinder 10, the rib 6 and the outer cylinder 11 in this order. Further, the thermoplastic resin reaches the groove portion 15b through the groove portion 15a. In FIG. 1, the thermoplastic resin that covers the outer peripheral surface of the rotor 1 is omitted.

  A pair of bearings 21 are abutted against both end surfaces of the inner cylindrical portion 10 of the connecting component 5. That is, the bearing 21 is positioned by the end surface of the inner cylinder part 10.

  The position detection magnet 7 is positioned in the radial direction by being set in a mold, and the coaxiality with the shaft 2, the rotor core 3 and the magnet 4 is ensured. The position detection magnet 7 is axially positioned by the end face of the rotor core 3. At this time, since the position detection magnet 7 is symmetrical in the axial direction, either one of both end surfaces of the position detection magnet 7 in the axial direction may be directed toward the rotor core 3, and the position detection magnet 7 is set. Is easy. Of the two stepped portions 18 provided on the position detecting magnet 7, the stepped portion 18 on the side opposite to the rotor core 3 side is embedded with a thermoplastic resin. Thereby, the axial detection of the position detecting magnet 7 is prevented. The rib portion 19 provided in the step portion 18 is embedded with a thermoplastic resin and serves as a detent for the position detection magnet 7.

  The rotor 1 is integrally formed by setting the shaft 2, the rotor core 3 and the position detecting magnet 7 in a mold and injecting a thermoplastic resin into the mold. However, the present invention is not limited to this. Instead, adhesion, press-fitting, or heat welding may be used for the integration of the rotor 1. That is, it is only necessary to obtain a connection structure between the shaft 2 and the rotor core 3 by the connection component 5. For example, the magnet 4 may be bonded to the outer peripheral surface of the rotor core 3. You may press-fit into the inner cylinder part 10. FIG.

  FIG. 14 is a side view showing the configuration of the stator, and FIG. 15 is a plan view showing the configuration of the stator. As shown in FIGS. 14 and 15, the stator 22 has an annular shape, and the rotor 1 is disposed inside the stator 22. The stator 22 includes an annular stator core 23 and a coil 25 wound around a tooth (not shown) of the stator core 23 via an insulating member 24. The stator core 23 is formed by punching an electromagnetic steel sheet, caulking the punched electromagnetic steel sheet, and laminating it in the axial direction by welding or bonding. The insulating member 24 is formed from a thermoplastic resin. The thermoplastic resin is, for example, polybutylene terephthalate. The insulating member 24 is formed integrally with the stator core 23, for example. The coil 25 is made of a magnet wire wound around a tooth.

  FIG. 16 is a perspective view showing the configuration of the mold stator. The mold stator 27 is obtained by integrally molding a stator assembly 28 with a mold resin. That is, the mold stator 27 is covered with the resin portion 31 made of mold resin. Here, the mold resin is a thermosetting resin which is, for example, a bulk molding compound. In the stator assembly 28, a sensor board (not shown) is assembled to the stator 22 shown in FIGS. 14 and 15, and the power supply lead 33 and the sensor lead 34 connected to the sensor board are connected to the lead part 32 of the resin part 31. It is drawn from. The mold stator 27 has an opening 29 into which the rotor 1 is inserted. The resin portion 31 is provided with a mounting foot 30.

  FIG. 17 is a perspective view showing a configuration of a molded motor 40 that is an electric motor according to the present embodiment, and FIG. 18 is a side view showing a configuration of the molded motor 40 that is an electric motor according to the present embodiment. As shown in FIGS. 17 and 18, the mold motor 40 includes a mold stator 27, a rotor 1 that is rotatably disposed inside the mold stator 27, and one axial end portion of the mold stator 27. A metal bracket 41 to be attached, a waterproof cap 42 that is attached to the bracket 41 to prevent water from entering between the shaft 2 and the bracket 41, and a movement of the waterproof cap 42 that is attached to the shaft 2 is restricted. A possible E-ring 43.

  As described above, in the present embodiment, the connecting component 5 that connects the shaft 2 and the rotor core 3 includes the rotor core 3 in addition to the inner cylinder portion 10, the rib portion 6, and the outer cylinder portion 11. A filling portion 12 embedded therein is provided. Thereby, since the outer cylinder part 11 is prevented from rotating with respect to the rotor core 3 by the filling part 12, it is suppressed that the outer cylinder part 11 peels from the rotor core 3. FIG.

  The filling portion 12 is composed of filling portions 12a and 12b. Since the width L2 of the filling portion 12b is larger than the width L1 of the filling portion 12a, the rotor core 3 and the shaft 2 are integrally formed of a thermoplastic resin. At that time, the connection component 5 is suppressed from being separated from the rotor core 3 due to the difference in the linear expansion coefficient between the rotor core 3 and the shaft 2, and the connection between the rotor core 3 and the shaft 2 is strengthened. The quality of the rotor 1 is improved.

  Although the outer cylinder portion 11 is prevented from rotating by the filling portion 12, the inner cylinder portion 10 can be provided with a knurling (not shown) on the outer peripheral surface 13 of the shaft 2 to prevent the knurling from rotating and coming off.

  Further, since the filling portion 12 enters the rotor core 3, it plays a role of transmitting torque generated by the rotation of the rotor core 3 to the shaft 2.

  Further, by connecting the shaft 2 and the rotor core 3 with a resin-made connecting component 5, the shaft 2 and the rotor core 3 can be insulated from each other, and the erosion resistance of the rotor 1 can be increased. improves.

  The connecting component 5 includes a rib portion 6. Thereby, when the blade | wing for ventilation is attached to the shaft 2, it becomes possible to suppress the resonance of the rotor 1 and a blade | wing by adjusting the width | variety and length of the rib part 6, for example.

  In the present embodiment, the sectional shape of the groove 15 is T-shaped when viewed in a cross section perpendicular to the rotation axis, but the sectional shape of the groove 15 is not limited to this. For example, the groove 15 may have an L-shaped cross section. In other words, the groove portion 15b may not extend on both sides of the groove portion 15a, but may extend on one side of the groove portion 15a. In this case, the filling portion 12 also has an L-shaped cross section. Even in this case, the same effect as described above can be obtained.

  In general, by filling the filling portion 12 in the rotor core 3, the function of the filling portion 12 as a detent of the outer cylinder portion 11 can be obtained regardless of the cross-sectional shape of the groove portion 15. That is, the cross-sectional shape of the groove portion 15 can be set to an arbitrary shape, and the cross-sectional shape of the filling portion 12 can also be set to an arbitrary shape according to the cross-sectional shape of the groove portion 15. Even in this case, the outer cylinder part 11 is prevented from rotating with respect to the rotor core 3 by the filling part 12, so that the outer cylinder part 11 is prevented from being peeled off from the rotor core 3. However, the effect which suppresses peeling from the rotor core 3 of the outer cylinder part 11 is greater by making the cross-sectional shape of the groove part 15 into the above-mentioned T shape. Generally, when the cross-sectional shape of the groove portion 15 is a shape whose width increases toward the radially outer side in at least a part of the radial direction, the movement of the outer cylinder portion 11 in the radial direction is restricted, The effect which suppresses peeling from the rotor core 3 of the outer cylinder part 11 is large.

Embodiment 2. FIG.
19 is a perspective view showing the configuration of the rotor according to the present embodiment, FIG. 20 is a plan view showing the configuration of the rotor according to the present embodiment, and FIG. 21 is a rotor according to the present embodiment. 22 is a cross-sectional view taken along line EE in FIG. 20, FIG. 23 is a cross-sectional view taken along line FF in FIG. 21, and FIG. 24 is a cross-sectional view taken along line GG in FIG. 25 is a perspective view showing the configuration of the rotor when the position detection magnet is removed, FIG. 26 is a partially enlarged view of FIG. 23, and FIG. 27 is a diagram for explaining FIG. 19 to 27, the same components as those shown in FIGS. 1 to 9 are denoted by the same reference numerals.

  In the rotor 1 </ b> A according to the present embodiment, a plurality of magnets 9 are respectively disposed in a plurality of magnet insertion holes 39 provided in the rotor core 3. The plurality of magnet insertion holes 39 are arranged, for example, at equal intervals in the circumferential direction of the rotor core 3. The number of magnet insertion holes 39 is 10 in the illustrated example. The magnet insertion hole 39 has a rectangular shape and penetrates the rotor core 3 in the direction of the rotation axis. A plate-like or bar-like magnet 9 is inserted into the magnet insertion hole 39. In a state where the magnet 9 is inserted into the magnet insertion hole 39, both axial end portions of the magnet 9 are held by a thermoplastic resin during molding. Thereby, the magnet 9 is fixed to the rotor core 3.

  The magnet 9 is a permanent magnet. The magnet 9 is a resin magnet containing at least one of rare earth magnet powder and ferrite powder, for example. The magnet 9 may be a sintered magnet. The plurality of magnets 9 are arranged so that the magnetization directions are alternately arranged in the circumferential direction of the rotor core 3. Further, the magnet 9 is disposed on the outer side in the radial direction from the position where the groove portion 15 is disposed.

  As shown in FIG. 27, when viewed in a cross section perpendicular to the rotation axis, the filling portion is on a straight line H connecting the rotation center O representing the position of the rotation axis and the center of the magnet 9 in the circumferential direction of the rotor core 3. 12b is arranged. Specifically, the center of the filling portion 12 in the direction orthogonal to the radial direction is arranged on the straight line H. On the straight line H, the filling portion 12a is also arranged. The straight line H is a straight line connecting the magnetic pole center of the rotor 1A and the rotation center O.

  As described above, the filling portion 12b closer to the magnet 9 is arranged on the straight line H connecting the rotation center O and the center of the magnet 9, so that the influence of the filling portion 12 on the magnetic path generated from the magnet 9 is suppressed. Therefore, it is possible to suppress a decrease in the performance of the electric motor.

  Even in the case of the magnet 4 of the first embodiment, the filling portion 12b closer to the magnet 4 is arranged on the straight line H connecting the rotation center O and the magnetic pole center of the magnet 4, so that the same as in the present embodiment. An effect is obtained.

  Other configurations of the present embodiment are the same as those described in the first embodiment, and thus description thereof is omitted. Further, since the other effects of the present embodiment are as described in the first embodiment, the description thereof is omitted.

Embodiment 3 FIG.
FIG. 28 is a diagram illustrating an example of the configuration of the air conditioner according to the present embodiment. The air conditioner 300 includes an indoor unit 301 and an outdoor unit 302 connected to the indoor unit 301. The indoor unit 301 has a blower 303. The outdoor unit 302 includes a blower 304 and a compressor 305. Blowers 303 and 304 and compressor 305 have the electric motors of Embodiment 1 or 2, respectively. Thereby, cost reduction, noise reduction, and quality improvement of the air conditioner 300 can be achieved.

  In addition, the electric motor of Embodiment 1 or 2 can also be mounted in electric equipments other than an air conditioner, and also in this case, the same effect as this Embodiment can be acquired.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  1,1A rotor, 2 shaft, 3 rotor core, 4,9 magnet, 5 connecting parts, 6,19 rib part, 7 position detection magnet, 8 air gap, 10 inner cylinder part, 11 outer cylinder part, 12 filling Part, 12a, 12b filling part, 13 outer peripheral surface, 14 inner peripheral surface, 15 groove part, 15a, 15b groove part, 18 step part, 20 rotor assembly, 21 bearing, 22 stator, 23 stator core, 24 insulation member , 25 coil, 27 mold stator, 28 stator assembly, 29 opening, 30 mounting foot, 31 resin part, 32 lead-out part, 33 power supply lead wire, 34 sensor lead wire, 39 magnet insertion hole, 40 mold motor, 41 Bracket, 42 Waterproof cap, 43 E-ring, 300 Air conditioner, 301 Indoor unit, 302 Outdoor unit, 303, 304 Blower, 305 pressure Reduction machine.

Claims (7)

An annular stator, and a rotor disposed inside the stator,
The rotor is
A shaft having an outer peripheral surface coaxial with the rotation axis of the rotor;
A groove portion that is arranged coaxially with the shaft and has an inner peripheral surface that is larger in diameter than the outer peripheral surface of the shaft and an outer peripheral surface that faces the stator, and extends on the inner peripheral surface in the direction of the rotating shaft An annular rotor core having
At least one permanent magnet fixed to the rotor core;
An inner cylinder part formed integrally with resin and disposed on the outer peripheral surface of the shaft, an outer cylinder part disposed on the inner peripheral surface of the rotor core, and the inner cylinder part and the outer cylinder part are rotated. A connecting part having a rib part connected in a radial direction of the core, and a filling part connected to the outer cylinder part and formed from the resin filled in the groove part;
An electric motor. The groove portion has a first groove portion and a second groove portion,
The first groove portion has a first width in a direction perpendicular to the radial direction and extends in a radial direction from the inner peripheral surface when viewed in a cross section perpendicular to the rotation axis.
The second groove portion communicates with the outer end in the radial direction of the first groove portion when viewed in a cross section perpendicular to the rotation axis, and is wider than the first width in a direction perpendicular to the radial direction. The electric motor according to claim 1, wherein the electric motor has a second width that is greater.   The electric motor according to claim 2, wherein the groove portion and the filling portion have a T shape when viewed in a cross section perpendicular to the rotation axis.   4. The electric motor according to claim 2, wherein the at least one permanent magnet is an annular permanent magnet disposed on the outer peripheral surface of the rotor core. 5. The rotor core has a plurality of magnet insertion holes arranged in a circumferential direction of the rotor core;
4. The electric motor according to claim 2, wherein the at least one permanent magnet is a plurality of permanent magnets respectively disposed in the plurality of magnet insertion holes. The filling portion is connected to the first filling portion and the first filling portion formed from the resin filled in the first groove portion, and filled in the second groove portion. A second filling portion formed from the resin,
The electric motor according to claim 5, wherein the second filling portion is disposed on a straight line connecting the center of the permanent magnet and the rotation shaft in the circumferential direction when viewed in a cross section perpendicular to the rotation shaft.   An air conditioner comprising the electric motor according to any one of claims 1 to 6.

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