JP2005261001A - Rotor of motor, motor, air conditioner, refrigerator and fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the rotor of a motor in which noise is reduced by reducing transmission force while enhancing productivity and reliability. <P>SOLUTION: In the rotor of a motor where a rotor magnet and a shaft are coupled through a rib formed by molding thermoplastic resin, a plurality of ribs of a predetermined width are provided in the circumferential direction to extend from an arbitrary point in the vicinity of one end face to an arbitrary point of the shaft facing the inner circumferential part of the rotor magnet along a plane including an arbitrary point in the vicinity of one end face of the rotor magnet and the center line of the shaft. A plurality of other ribs of a predetermined width are also provided in the circumferential direction to extend from an arbitrary point in the vicinity of the other end face to an arbitrary point of the shaft facing the inner circumferential part of the rotor magnet along a plane including an arbitrary point in the vicinity of the other end face of the rotor magnet and the center line of the shaft. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an anti-vibration structure for a rotor of an electric motor using permanent magnets such as a brushless motor and a stepping motor, an electric motor, an air conditioner, a refrigerator, and a ventilation fan using the same.

A conventional rotor of an electric motor is known in which a plastic magnet and a shaft are integrated with a connecting portion having a radial rib formed by thermoplastic resin (see, for example, Patent Documents 1 and 2).
JP 2001-320844 A (page 3, FIG. 1) Japanese Unexamined Patent Publication No. 2000-152543 (pages 2 and 3, FIG. 1)

  Since the rotor of a conventional electric motor is configured as described above, in order to further improve the vibration isolation effect, the rib thickness is reduced, the width (axial direction) is shortened, and the length (radial direction) is increased. Although it is necessary, if the inner diameter and shaft diameter of the rotor magnet are determined, the rib length cannot be changed greatly, and the thickness and width are adjusted.

  However, if the wall thickness is too thin, there are manufacturing problems such as resin not flowing into the ribs and molding defects. Further, if the width is too small, the balance for holding the rotor magnet is deteriorated, and there is a problem that vibration and vibration occur.

  The present invention has been made to solve the above-described problems, and uses a rotor for an electric motor that achieves noise reduction, productivity improvement, and reliability improvement by reducing a transmission excitation force, and the same. An object is to provide an electric motor, an air conditioner, a refrigerator, and a ventilation fan.

  An electric motor rotor according to the present invention is an electric motor rotor in which a rotor magnet and a shaft are connected by a rib formed by molding a thermoplastic resin. And a plurality of ribs having a predetermined width extending from an arbitrary point near one end surface to an arbitrary point on the shaft facing the inner periphery of the rotor magnet substantially along a plane including the axis and the axis center line. And an arbitrary point on the axis facing the inner periphery of the rotor magnet from an arbitrary point near the other end face substantially along the plane including the axis center line and an arbitrary point near the other end face of the rotor magnet. A plurality of other ribs having a predetermined width extending in the circumferential direction are provided in the circumferential direction.

  With the above configuration, the rotor of the electric motor according to the present invention can hold the rotor magnet so as not to bend in the axial direction even when the rib width is reduced, and can prevent vibration and vibration and reduce noise. It becomes.

Embodiment 1 FIG.
1 to 5 are diagrams showing the first embodiment, FIG. 1 is a diagram showing a rotor of an electric motor, FIG. 2 is a diagram showing a rotor magnet, and FIG. 3 is a diagram showing a mold for molding the rotor. 4 is a diagram showing a vibration transmission characteristic of the rotor, and FIG. 5 is a diagram showing a modification of the rotor of the electric motor.

  As shown in FIG. 1, the shaft 1, the rotor magnet 3, and the position detection magnet 6 are integrally formed of a thermoplastic resin such as polybutylene terephthalate (PBT).

  As shown in FIG. 2, the rotor magnet 3 formed of a polar-oriented plastic magnet has a plurality of rotor magnet inner diameter recesses 4 penetrating in the axial direction on the inner diameter side and a plurality of pedestals 5 on one end face. I have. The number of the pedestals 5 is smaller than the number of the recesses 4 having the inner diameter of the rotor magnet, and the recesses 4 having the inner diameter of the rotor magnet penetrate the pedestal 5.

  As shown in FIG. 1, the position detection magnet 6 includes a plurality of position detection magnet projections 7 on one end face. The rotor magnet 3 and the position detection magnet 6 are configured such that the concave portion 4 of the rotor magnet inner diameter of the rotor magnet 3 and the convex portion 7 of the position detection magnet are fitted to each other and the position detection magnet up to the base 5 of the rotor magnet 3 is fitted. 6 is inserted so that one side end face contacts. And it integrally shape | molds with thermoplastic resins, such as PBT, with the axis | shaft 1. FIG.

  A thermoplastic resin such as PBT forms an outer cylinder 8 integral with the rotor magnet 3, an inner cylinder 9 integral with the shaft 1, ribs 10a and 10b connecting the outer cylinder 8 and the inner cylinder 9, and the rib 10a. A cavity 11 is formed between the rib 10b. The outer cylinder 8 is prevented from rotating by the resin flowing into the concave portion 4 of the inner diameter of the rotor magnet, and the flange 12 is formed so as to sandwich the both end faces of the rotor magnet 3 to prevent the outer cylinder 8 from coming off.

  Since the hole 13 formed by the positioning pin of the mold is positioned with the magnetic pole of the rotor magnet 3, it can also be used for position detection and positioning in a subsequent process such as magnetization.

  The inner cylinder 9 is formed so as to cover the knurl 2 of the shaft 1 and serves as a rotation stopper and a stopper. By alternately arranging the ribs 10a on one end face of the rotor magnet 3 and the ribs 10b on the opposite end face, the rotor magnet 3 is held so as not to be bent in the axial direction even if the rib width and thickness are small. It is possible.

  On the rotor magnet 3 side of the rib 10a, a convex portion 14 connected from the opposite end surface of the rotor magnet 3 to the rib 10a is provided, and a gate 15 for filling a thermoplastic resin is disposed on the convex portion 14. . The rib 10a on the side opposite to the gate 15 makes it difficult for the resin to flow, but the resin flow path is secured by the convex portion 14 and the resin can easily flow through the rib even when the rib is thin, thereby improving the moldability. .

  In FIG. 3, the mold 16 for molding the rotor includes a fixed mold 16a and a movable mold 16b. The shaft 1, the rotor magnet 3, and the position detection magnet 6 are set in the mold 16, and resin is injected from the gate 15. The rotor magnet 3 is positioned by fitting the recess 4 of the rotor magnet inner diameter with the rotor magnet positioning pin 18.

  A space formed by the mold 16, the shaft 1, the rotor magnet 3, and the position detection magnet 6 is filled and molded with resin to form a rotor of the electric motor. The rib 10a on one end face is in the space formed by the convex part 17a of the fixed mold 16a and the movable mold 16b, and the rib 10b on the opposite end face is the convex part 17b of the movable mold 16b and the fixed side mold. It is formed by filling the space formed by the mold 16a with resin.

  Arranging the rib 10a on one end face and the rib 10b on the opposite end face at the same position in the circumferential direction is effective for holding the rotor magnet 3 so as not to bend in the axial direction. Since either the convex part or the rib on the end face side interferes, the rib cannot be arranged at the same position in the circumferential direction. Therefore, they are arranged alternately. However, even if they are not alternate, they may be arranged in a well-balanced manner so that the rotor magnets 3 are not bent in the axial direction by being shifted from each other at positions that do not interfere with each other.

  In this way, the ribs 10a are alternately arranged on one end face of the rotor magnet 3, and the ribs 10b are alternately arranged on the opposite end face, and the gate 15 is provided on the convex portion 14 formed from the opposite end face to the rib 10a on the one end face. Thus, even if the width and thickness of the rib are small, the rotor magnet 3 can be held so as not to bend in the axial direction.

  When the rib width and wall thickness are reduced, the resonance frequency changes from f (Hz) to f ′ (Hz) when the rib width and wall thickness is large, as shown in the vibration transmission characteristics of FIG. In addition, the vibration transmission force in the vicinity of f (Hz) is greatly reduced, and the resonance sound in the vicinity of f (Hz) can be reduced. In addition, the transmission force increases in the vicinity of f '(Hz), but since it is on the low frequency side, an effect that it is difficult to hear the resonance sound by hearing is obtained.

  In FIG. 1, the rotor magnet 3 formed of a polar-oriented plastic magnet is connected to the shaft 1 by resin molding. For example, as illustrated in FIG. 5, the rotor magnet 3 is formed of a radially-oriented plastic magnet. Even in the case of the rotor magnet 3 using the back yoke 19 as the magnet and the magnetic path, the rotor magnet 3 and the shaft 1 are connected to the rib 10a on the one end face of the rotor magnet 3 on the opposite side as in FIG. With the structure in which the ribs 10b are arranged on the end face with the circumferential position being shifted, the rotor magnet 3 can be held so as not to bend in the axial direction, and vibration and vibration can be prevented and noise can be reduced.

  Although the thing using the rotor magnet shape | molded with the plastic magnet was shown, the kind of magnet is not ask | required.

  When using a pole-oriented magnet, the configuration has no back yoke as shown in FIG. 1, and when using a radially oriented magnet, a back yoke 19 serving as a magnetic path is required as shown in FIG. That's what it means.

  In addition, the shaft 1, the rotor magnet 3, and the position detection magnet 6 are integrally formed. However, the shaft 1, the rotor magnet 3, the position detection magnet 6, and the thermoplastic resin such as PBT are molded into the above configuration. Regardless of the bonding method, such as bonding, press-fitting, thermal welding, or a combination of the two, the same effect can be obtained by connecting the shaft 1 and the rotor magnet 3 to the above configuration. Needless to say.

  In addition, it has been shown that the rib 10a on one end face of the rotor magnet 3 and the rib 10b on the opposite end face are arranged at equal intervals in the rotation direction. It goes without saying that the effect of can be obtained.

Embodiment 2. FIG.
6 and 7 are diagrams showing the second embodiment, FIG. 6 is a diagram showing a rotor of an electric motor, and FIG. 7 is a diagram showing a modification of the rotor of the electric motor.
As shown in FIG. 6, a rib 10c extending from one end face of the rotor magnet 3 to the shaft 1 of the other end face and a rib 10d extending from the other end face of the rotor magnet 3 to the shaft 1 of the one end face are circular. You may make it arrange | position by shifting the position of the circumferential direction alternately or in the circumferential direction.

  With such a configuration, it is possible to hold the rotor magnet 3 so as not to bend in the axial direction, prevent vibration and vibration, and reduce noise.

  Further, as shown in FIG. 7, even in the case of a rotor magnet 3 using a back yoke 19 as a magnetic path and a magnet formed of a radially oriented plastic magnet, the connection between the rotor magnet 3 and the shaft 1 is illustrated in FIG. 7, a rib 10 c extending from one end surface of the rotor magnet 3 to the shaft 1 of the other end surface and a rib 10 d extending from the other end surface of the rotor magnet 3 to the shaft 1 of the one end surface are circumferentially arranged. Alternatively, the positions in the circumferential direction may be shifted.

  With such a configuration, it is possible to hold the rotor magnet 3 so as not to bend in the axial direction, prevent vibration and vibration, and reduce noise.

Embodiment 3 FIG.
8 and 9 are diagrams showing Embodiment 3, FIG. 8 is a diagram showing a rotor of an electric motor, and FIG. 9 is a diagram showing a modification of the rotor of the electric motor.
As shown in FIG. 8, a rib 10 g extending from one end face of the rotor magnet 3 to the central shaft 1 of the rotor magnet 3, and a central shaft of the rotor magnet 3 from the other end face of the rotor magnet 3. The ribs 10h extending to 1 may be arranged alternately in the circumferential direction or at different positions in the circumferential direction.

  With such a configuration, it is possible to hold the rotor magnet 3 so as not to bend in the axial direction, prevent vibration and vibration, and reduce noise.

  Further, as shown in FIG. 9, even in the case of a rotor magnet 3 using a back yoke 19 as a magnetic path and a magnet formed of a radially oriented plastic magnet, the connection between the rotor magnet 3 and the shaft 1 is illustrated in FIG. 8, a rib 10 g extending from one end face of the rotor magnet 3 to the central shaft 1 of the rotor magnet 3, and the other end face of the rotor magnet 3 to the central shaft 1 of the rotor magnet 3. The extending ribs 10h may be arranged alternately in the circumferential direction or at different positions in the circumferential direction.

  With such a configuration, it is possible to hold the rotor magnet 3 so as not to bend in the axial direction, prevent vibration and vibration, and reduce noise.

Embodiment 4 FIG.
FIG. 10 shows the fourth embodiment, and is a cross-sectional view of the rotor of the electric motor.
In the rotor of the electric motors of the first to third embodiments, the rib 10a and the rib 10b extend in the radial direction with the same thickness and are connected to the outer cylinder 8 and the inner cylinder 9 with the same thickness. As shown in FIG. 10, the thickness may be thin in the vicinity of the connecting portion between the outer cylinder 8 and the inner cylinder 9, and may be thicker in other cases.

  The ribs 10a and 10b should be as thin as possible in order to reduce the rigidity. However, if the entire rib is made thin, the resin flow at the time of resin molding becomes worse. Therefore, the thickness is reduced only in the vicinity of the connecting portion between the outer cylinder 8 and the inner cylinder 9 that easily affects the rigidity of the rotor. If the thin part is short, there is little effect on the resin flow. By reducing the thickness in the vicinity of the connecting portion between the outer cylinder 8 and the inner cylinder 9, the rigidity is lowered and the resonance frequency can be lowered.

Embodiment 5 FIG.
11 to 13 are diagrams showing the fifth embodiment, FIG. 11 is a diagram showing the rotor of the electric motor, FIG. 12 is a diagram showing the rotor of the electric motor having a hole in the elastic body, and FIG. 13 is an axial direction of the rib It is sectional drawing. Components identical or corresponding to those in FIG. 1 of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 11, the shaft 1, the rotor magnet 3, and the position detecting magnet 6 are molded and integrated with a thermoplastic resin such as PBT. A thermoplastic resin such as PBT forms an outer cylinder 8 that is integral with the rotor magnet 3, an inner cylinder 9 that is integral with the shaft 1, and ribs 10 a and 10 b that connect the outer cylinder 8 and the inner cylinder 9. The axial positions of the ribs 10 a and 10 b are arranged inside the end face of the rotor magnet 3. The ribs 10a are alternately arranged on one end face of the rotor magnet 3, and the ribs 10b are alternately arranged on the opposite end face.

  The cavity 11 other than the rib is filled with an elastic body 20 such as rubber. In the elastic body 20 such as rubber, the rib 10a and the rib 10b are prevented from rotating and are prevented from coming off. Excitation force causing abnormal noise is transmitted by the ribs 10 a and 10 b, but is attenuated by the elastic body 20 filled in the cavity 11.

  As shown in FIG. 12, a hollow portion 21 penetrating in the axial direction may be provided in the elastic body 20 between the rib 10a and the rib 10b. The elastic body 20 is arrange | positioned so that the rib 10a and the rib 10b may be covered. As shown in FIG. 13, in the hollow portion 21, the thickness t1 of the elastic body on the rib side surface is smaller than the thickness t2 of the elastic body on the axial end surface of the rib, and the thickness of the elastic body 20 near the hollow portion 21 is rib. The side surface is smaller than the end surface in the axial direction, and the elastic body 20 comes into close contact with the rib when the elastic body contracts, thereby improving the reliability.

  Here, it is shown that the number of the hollow portions 21 is one between the ribs. However, if the thickness t1 of the elastic body 20 on the rib side surface is thinner than the thickness t2 of the elastic body 20 on the axial end surface of the rib, a plurality of hollow portions 21 are provided. The same effect can be obtained.

  With this configuration, vibration can be damped by the elastic body 20 filled in the cavity 11 other than the ribs. Further, if the elastic body 20 is filled also on the end face side of the rib, that is, the rib is completely covered with the elastic body 20, the damping effect is improved and the elastic body 20 is more reliably prevented from coming off.

Embodiment 6 FIG.
FIG. 14 is a diagram showing the sixth embodiment, and is a diagram showing a rotor of an electric motor using a rotor magnet in which a plastic magnet and a yoke are combined in a rib structure radially arranged around an axis. . The same or corresponding parts as in FIG. 1 or FIG.
In FIG. 14, the ribs 10 are radially arranged around the axis 1. The thickness of the rib 10 is reduced in the vicinity of the connecting portion between the inner tube 9 and the outer tube 8, and the thickness of the other portions is increased from the vicinity of the connecting portion.

  In order to reduce the rigidity of the rib 10, it is preferable that the thickness is as thin as possible. However, if the entire rib is made thin, the resin flow at the time of resin molding becomes worse. Therefore, the thickness is reduced only in the vicinity of the connecting portion between the outer cylinder 8 and the inner cylinder 9 that easily affects the rigidity of the rotor. If the thin part is short, there is little effect on the resin flow. By reducing the thickness in the vicinity of the connecting portion between the outer cylinder 8 and the inner cylinder 9, even when the ribs 10 that are radially arranged around the shaft 1 are used in the radial direction, the rigidity is lowered and the resonance frequency is reduced. Therefore, vibration and vibration can be prevented and noise can be reduced.

  FIG. 14 shows a rotor magnet 3 using a back yoke 19 as a magnetic path and a magnet that is radially oriented and molded with a plastic magnet, instead of the rotor magnet 3 molded with a polar oriented plastic magnet. The rotor magnet 3 formed of a polar-oriented plastic magnet may be used.

Embodiment 7 FIG.
FIG. 15 is a diagram showing the seventh embodiment, and is a diagram showing a rotor of an electric motor. The same or corresponding parts as in FIG.
In FIG. 15, the shaft 1, the rotor magnet 3, and the position detecting magnet 6 are molded and integrated with a thermoplastic resin such as PBT. Thermoplastic resin such as PBT is arranged radially in the radial direction around the axis, connecting the outer cylinder 8 integrated with the rotor magnet 3, the inner cylinder 9 integrated with the shaft 1, the outer cylinder 8 and the inner cylinder 9. The ribs are formed, and a cavity 11 is formed between the ribs.

  The rib is shorter than the axial length of the rotor magnet 3 and is arranged so that the rotor magnet 3 and the axial center of the rib coincide. Ribs 10e that connect the outer cylinder 8 and the inner cylinder 9 and ribs 10f that are separated between the outer cylinder 8 and the inner cylinder 9 and are combined with ribs 10f1 and 10f2 having a T-shaped cross section are alternately arranged in the circumferential direction. Be placed.

  The ribs 10f1 and 10f2 are separated from each other with a gap between them, and the opposed parts are joined by an elastic body 20a such as rubber to form a rib 10f. The elastic body 20 is longer than the axial length of the ribs 10f1 and 10f2, and is large enough to cover the tip T shape of the ribs 10f1 and 10f2.

  By doing so, it is possible to attenuate the excitation force in the rotational direction by the elastic body 20a of the rib 10f disposed between the ribs 10e while being rigidly supported in the radial direction by the ribs 10e.

  Further, the elastic body 20a of the rib 10f is made longer than the length in the axial direction of the rib to prevent the elastic body 20a from coming off, and the opposite ends of the ribs f1 and f2 are formed in a T shape so as to sufficiently cover this. Thus, the elastic body 20a can be prevented from coming off in the radial direction.

Embodiment 8 FIG.
FIG. 16 is a diagram showing the eighth embodiment, and is a diagram showing a manufacturing flow of the rotor of the electric motor.
A method for manufacturing the rotor of the electric motor in Embodiments 1 to 7 will be described with reference to FIG. The rotor magnet 3 will be described using a pole-oriented plastic magnet (or other magnet), but other, for example, a radially-oriented plastic magnet (or other magnet) using a back yoke. However, the manufacturing flow is basically the same.

First, in step S1, a plastic magnet is molded to manufacture the rotor magnet 3.
In step S2, the rotor magnet 3 is demagnetized.
On the other hand, in step S3, a position detection magnet 6 is manufactured by molding a plastic magnet.
In step S4, the position detecting magnet 6 is demagnetized.
In step S5, the rotor magnet 3 and the position detection magnet 6 are fitted together with the concave portion 4 of the rotor magnet inner diameter of the rotor magnet 3 and the convex portion 7 of the position detection magnet of the position detection magnet 6. The position detection magnet 6 is inserted and assembled so that the one end surface of the position detection magnet 6 contacts the pedestal 5 of the magnet 3.
In step S <b> 6, the shaft 1 is processed, and the knurl 2 is formed on the shaft 1.

In step S7, the shaft 1, the rotor magnet 3, and the position detection magnet 6 are set on the mold 16 including the fixed mold 16a and the movable mold 16b.
In step S8, the concave portion 4 having the inner diameter of the rotor magnet is fitted and positioned on the rotor magnet positioning pin 18, and the resin is injected from the gate 15 to be molded.
In step S9, the rotor magnet 3 and the position detection magnet 6 are magnetized.
In step S10, the bearing is assembled to the shaft 1 to complete.

  By manufacturing with the above manufacturing flow, the rotor of the electric motor in Embodiment 1 thru | or 7 can be obtained efficiently.

Embodiment 9 FIG.
FIG. 17 shows the ninth embodiment, and is a cross-sectional view of a molded electric motor. In the figure, a mold motor (an example of an electric motor) inserts the rotor 23 described in the first to eighth embodiments in which the bearing 24 is press-fitted and fixed until it hits the inner cylinder 9 into the hollow inside the mold stator 22. The bracket 25 is press-fitted into the mold stator 22 so that the bearing 24 is held by the stator 22 and the bracket 25, and the mold electric motor is completed.

  Since the rotor of the electric motor according to any of the first to eighth embodiments has a vibration-proof structure, it is possible to reduce noise, vibration and quality of the molded electric motor.

  Although the mold motor has been described as an example of the motor, other types may be used (for example, a steel plate is used instead of a mold).

Embodiment 10 FIG.
18 and 19 are diagrams showing Embodiment 10, FIG. 18 is a diagram showing a wall-mounted air conditioner, and FIG. 19 is a diagram showing a configuration of the indoor unit.
18, the wall-mounted air conditioner includes an indoor unit 26 and an outdoor unit 27. The indoor unit 26 uses an indoor unit blower 28b (see FIG. 19), and the outdoor unit 27 uses an outdoor unit blower 28a. ing.
The outdoor unit blower 28a and the indoor unit blower 28b are driven by the electric motor of the ninth embodiment.

  In recent years, noise reduction has progressed in air conditioners, and it is preferable to use the electric motor of Embodiment 9 as a blower motor that is a main part of the air conditioner.

  With this configuration, the quality of the blower of the wall-mounted air conditioner is improved, and noise reduction can be realized.

Embodiment 11 FIG.
20 and 21 are diagrams showing Embodiment 11, FIG. 20 is a diagram showing an indoor unit of a ceiling-embedded air conditioner, and FIG. 21 is a diagram showing the outdoor unit.
As shown in FIG. 20, the indoor unit of the ceiling-embedded air conditioner uses a blower 29. By mounting the electric motor shown in Embodiment 9 on the blower 29, the quality of the blower 29 and the ceiling-embedded air conditioner can be improved, and noise reduction can be realized.

  As shown in FIG. 21, the outdoor unit of the ceiling embedded air conditioner also uses the blower 30. By mounting the electric motor shown in Embodiment 9 on the blower 30, the quality of the blower 30 and the ceiling-embedded air conditioner can be improved, and noise reduction can be realized.

Embodiment 12 FIG.
FIG. 22 shows the twelfth embodiment and shows a refrigerator.
As shown in the figure, the refrigerator includes a blower 31 in the cooling chamber for sending the cold air generated by the cooler to the cooling chamber to the refrigeration chamber, the freezing chamber, and the like.

  By mounting the electric motor shown in the ninth embodiment on the blower 31, the quality of the blower 31 and the refrigerator is improved, and noise reduction can be realized.

Embodiment 13 FIG.
FIG. 23 shows the thirteenth embodiment and shows a ventilation fan.
As shown in the figure, the ventilation fan includes a blower 32 for performing a ventilation operation.

  By mounting the electric motor shown in Embodiment 9 on the blower 32, the quality of the blower 32 and the ventilation fan can be improved, and low noise can be realized.

It is a figure which shows Embodiment 1, and is a figure which shows the rotor of an electric motor. It is a figure which shows Embodiment 1, and is a figure which shows a rotor magnet. It is a figure which shows Embodiment 1, and is a figure which shows the metal mold | die which shape | molds a rotor. It is a figure which shows Embodiment 1, and is a figure which shows the vibration transmission characteristic of a rotor. It is a figure which shows Embodiment 1, and is a figure which shows the modification of the rotor of an electric motor. It is a figure which shows Embodiment 2, and is a figure which shows the rotor of an electric motor. It is a figure which shows Embodiment 2, and is a figure which shows the modification of the rotor of an electric motor. It is a figure which shows Embodiment 3, and is a figure which shows the rotor of an electric motor. It is a figure which shows Embodiment 3, and is a figure which shows the modification of the rotor of an electric motor. It is a figure which shows Embodiment 4, and is sectional drawing of the rotor of an electric motor. It is a figure which shows Embodiment 5, and is a figure which shows the rotor of an electric motor. It is a figure which shows Embodiment 5, and is a figure which shows the rotor of the electric motor which provided the hole in the elastic body. It is a figure which shows Embodiment 5, and is an axial sectional view of a rib. FIG. 16 is a diagram illustrating the sixth embodiment, and is a diagram illustrating a rotor of an electric motor using a rotor magnet in which a plastic magnet and a yoke are combined in a rib structure radially arranged around an axis. It is a figure which shows Embodiment 7, and is a figure which shows the rotor of an electric motor. It is a figure which shows Embodiment 8, and is a figure which shows the manufacture flow of the rotor of an electric motor. It is a figure which shows Embodiment 9, and is sectional drawing of a mold motor. It is a figure which shows Embodiment 10, and is a figure which shows a wall-hanging type air conditioner. It is a figure which shows Embodiment 10, and is a figure which shows the structure of the same indoor unit. It is a figure which shows Embodiment 11, and is a figure which shows the indoor unit of a ceiling embedded type air conditioner. It is a figure which shows Embodiment 11, and is a figure which shows the same outdoor unit. It is a figure which shows Embodiment 12, and is a figure which shows a refrigerator. It is a figure which shows Embodiment 13, and is a figure which shows a ventilation fan.

Explanation of symbols

  1 axis, 2 knurls, 3 rotor magnet, 4 concave portion of rotor magnet inner diameter, 5 base, 6 position detecting magnet, 7 convex portion of position detecting magnet, 8 outer cylinder, 9 inner cylinder, 10, 10a, 10b , 10 c, 10 d, 10 e, 10 f, 10 f 1, 10 f 2, 10 g, 10 h Rib, 11 cavity, 12 flange, 13 hole formed by mold positioning pin, 14 convex part, 15 gate, 16 mold, 16a fixed side Mold, 16b Movable mold, 17a, 17b Convex part, 18 Rotor magnet positioning pin, 19 Back yoke, 20, 20a Elastic body, 21 Hollow part, 22 Mold stator, 23 Rotor, 24 Bearing, 25 Bracket, 26 indoor unit, 27 outdoor unit, 28a blower for outdoor unit, 28b blower for indoor unit, 29-31 blower .

Claims (13)

In a rotor of an electric motor in which a rotor magnet and a shaft are connected by a rib formed by molding a thermoplastic resin,
Arbitrary point of the shaft facing the inner periphery of the rotor magnet from an arbitrary point near the one end surface substantially along an arbitrary point near the one end surface of the rotor magnet and a plane including the axial center line A plurality of ribs having a predetermined width extending in the circumferential direction are provided in the circumferential direction, and an arbitrary point in the vicinity of the other end surface substantially along the surface including the arbitrary point near the other end surface of the rotor magnet and the axis center line. A rotor for an electric motor comprising a plurality of other ribs having a predetermined width extending in a circumferential direction extending from an arbitrary point to an arbitrary point on the shaft facing the inner periphery of the rotor magnet.   The rib extending from an arbitrary point near one end surface of the rotor magnet and the other rib extending from an arbitrary point near the other end surface are formed in a radial direction. Electric motor rotor.   The rib extending from an arbitrary point near one end surface of the rotor magnet extends to the axis on the other end surface side of the rotor magnet, and the other rib extending from an arbitrary point near the other end surface is the rotation 2. The rotor of an electric motor according to claim 1, wherein the rotor is formed so as to extend on an axis on one end face side of the child magnet.   The rib extending from an arbitrary point near one end surface of the rotor magnet and the other rib extending from an arbitrary point near the other end surface are formed so as to extend to an axis near the central portion of the rotor magnet. The rotor of the electric motor according to claim 1.   The rib is characterized in that the thickness of the other portion of the rib is made thicker than the thickness of the connecting portion between the outer cylinder integrated with the rotor magnet and the inner cylinder integrated with the shaft. The rotor of the electric motor according to any one of claims 1 to 4.   A connecting portion formed by resin molding with the shaft, which is formed inside the rotor magnet, is adjacent to an outer tube integrated with the rotor magnet and an inner tube integrated with the shaft. The rotor for an electric motor according to any one of claims 1 to 5, further comprising a cavity formed by the rib, and the cavity is filled with an elastic body.   The rotor of an electric motor according to claim 6, wherein a hole penetrating in the axial direction is provided in the elastic body, and the thickness of the elastic body is made thicker on the axial end surface side than on the rib side surface side. An electric motor in which a rotor magnet and a shaft are connected by a plurality of radially-arranged ribs formed by molding a thermoplastic resin, and a cavity penetrating in the axial direction is formed between the ribs. In the rotor,
The rotation of the electric motor according to claim 1, wherein the rib is formed such that a thickness of a connection portion between an outer cylinder integrated with the rotor magnet and an inner cylinder integrated with the shaft is thinner than other portions of the rib. Child. An electric motor in which a rotor magnet and a shaft are connected by a plurality of radially-arranged ribs formed by molding a thermoplastic resin, and a cavity penetrating in the axial direction is formed between the ribs. In the rotor,
A rotor of an electric motor, wherein a part of the plurality of ribs is cut off and coupled with an elastic body.   An electric motor using the rotor of the electric motor according to claim 1.   An air conditioner comprising the electric motor according to claim 10 mounted on a blower.   A refrigerator comprising the electric motor according to claim 10 mounted on a blower.   A ventilation fan comprising the electric motor according to claim 10 mounted on a blower.

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