JP6138083B2 - Electric motor rotor and air conditioner - Google Patents

Description

  The present invention relates to a rotor of an electric motor and an air conditioner, and more particularly to a structure of a rotor of an electric motor that suppresses vibration.

  In the conventional permanent magnet motor, as a measure for suppressing vibration prevention during rotation of the rotor, a buffer member such as an elastomer is inserted from the axial direction between the permanent magnet provided on the rotor and the rotor core. It is configured. In the prior art described in Patent Document 1 below, the rotor magnet has a first receiving portion that protrudes toward the shaft on the inner peripheral side, and the core formed on the shaft is the rotor on the outer peripheral side. A projecting second receiving portion is provided toward the magnet, and an elastic body serving as a buffer member is interposed between these receiving portions. Furthermore, the second receiving part has a plurality of bar-shaped parts that are parallel to the shaft and pass between the first receiving parts, and has a claw part at the tip of these bar-shaped parts. Inside the rotor magnet, an elastic body is interposed between the first receiving portion and the second receiving portion on the rotor magnet side, and a claw portion is attached to an end plate disposed on the end surface of the elastic body. By passing, the elastic body is pressed from the axial direction of the shaft by the end plate, the first receiving portion, and the second receiving portion. With this configuration, the first receiving part on the magnet side and the second receiving part on the core side are connected, the elastic body between these receiving parts is pressed, and the elastic body is connected to the inner circumference of the magnet and the core. Since it touches the outer periphery, the magnet can be securely held by the core, and the magnet is held by an elastic body, so that the rotor is prevented from vibrating, eccentric and tilting. Can do.

JP 2000-295803 A

  However, according to the prior art disclosed in Patent Document 1, the elastic body is attached to the shaft by passing the claw portion through the end plate disposed on the end surface interposed between the first receiving portion and the second receiving portion. Since it is configured to be pressed down from the axial direction, the claw portion must be configured to be securely locked to the end plate, so the axial thickness of the elastic body, the axial length of the rod-like portion, etc. High manufacturing accuracy is required. In addition, since it is necessary to lock the claw portion to the end plate, a large force must be applied when the axial length of the rod-shaped portion is relatively short due to manufacturing errors of the elastic body or rod-shaped portion. In this case, there is a problem that the claw portion cannot be locked to the end plate.

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

In order to solve the above-described problems and achieve the object, the present invention is a rotor of an electric motor in which an elastic body is disposed between a shaft and a rotor magnet, and a thermoplastic resin is integrally formed on the shaft. And a resin portion that covers a part of the shaft in a cylindrical shape and is interposed between the elastic body and the shaft, and is formed on the outer periphery of the resin portion on one end side of the resin portion, and is on one end side of the elastic body a shaft resin molded component comprising a flange, the disposed, the fitted end portion of the other end of the resin portion, and an elastic member pressing part for pressing the other end of the elastic body, the elastic A concave portion is formed in the center of the body pressing component, and the resin portion is fitted into the concave portion, and an outer peripheral surface and a tip surface of the end portion of the resin portion are in contact with each other, and the elastic body is the shaft resin molded component. And the elastic body holding part It is more pinched.

  According to this invention, since the elastic body is sandwiched between the shaft resin molded part and the elastic body pressing part, there is an effect that the quality can be improved and the cost can be reduced.

FIG. 1 is a side sectional view of a rotor of an electric motor according to an embodiment of the present invention. FIG. 2 is a side view of the back yoke. FIG. 3 is a partially enlarged view of the back yoke shown in FIG. FIG. 4 is a perspective view of the rotor magnet before the runner is cut from the runner side. FIG. 5 is a perspective view of a rotor magnet resin molded part. FIG. 6 is a perspective view of a shaft resin molded part. FIG. 7 is a perspective view of an elastic body on the long axis side. FIG. 8 is a perspective view of an elastic body on the short axis side. FIG. 9 is a perspective view of the elastic body pressing component. FIG. 10 is a view for explaining the assembly procedure of the rotor. FIG. 11 is a side view of the electric motor according to the embodiment of the present invention. FIG. 12 is a configuration diagram of the air conditioner according to the embodiment of the present invention.

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

Embodiment.
FIG. 1 is a side sectional view of a rotor 100 of an electric motor according to an embodiment of the present invention. FIG. 2 is a side view of the back yoke 61. FIG. 3 is a partially enlarged view of the back yoke 61 shown in FIG. FIG. 4 is a perspective view of the rotor magnet 60 before the runner is cut from the runner side. FIG. 5 is a perspective view of the rotor magnet resin molded part 3. FIG. 6 is a perspective view of the shaft resin molded part 40. FIG. 7 is a perspective view of the elastic body 20 on the long axis side. FIG. 8 is a perspective view of the elastic body 30 on the short axis side. FIG. 9 is a perspective view of the elastic body pressing component 50. FIG. 10 is a view for explaining an assembly procedure of the rotor 100. FIG. 11 is a side view of the electric motor 110 according to the embodiment of the present invention.

  The rotor magnet resin molded part 3 is obtained by integrally molding the sensor magnet 10 and the rotor magnet 60 obtained by injection molding the resin magnet 69 on the back yoke 61 with a thermoplastic resin (resin 68).

  The back yoke 61 is obtained by injection-molding a soft magnetic material or a thermoplastic resin containing ferrite. When the back yoke 61 is molded, the outer side of the portion that forms the outer periphery of the back yoke 61 of the mold is obtained. By arranging a strong magnet and providing an orientation magnetic field, the soft magnetic material or ferrite contained in the back yoke 61 is oriented anisotropically with respect to the polar direction.

  Although the back yoke 61 is formed in a substantially cylindrical shape, the outer periphery has a wave shape in which the magnetic poles are thin and the distance between the poles is thick, and a soft magnetic material or ferrite is contained between the poles of one end surface 72 of the back yoke 61. A gate port (gate processing trace 71a: see FIG. 3) for injecting the thermoplastic resin to be used is provided. By providing as many gate openings as the number of magnetic poles, the injection state of the soft magnetic material or the thermoplastic resin containing ferrite becomes the same for the magnetic poles, and the orientation can be made uniform. Thus, quality can be improved. Furthermore, the quality can be improved by providing a gate opening at a portion where the thickness is between the poles to obtain an optimum position for the resin flow.

  Moreover, the gate port is rounded from the end surface 72 of the back yoke 61, and the burrs remaining at the gate port are exposed from the end surface 72 by setting the center of the recess 71 by notching a predetermined amount inward in the axial direction. By preventing this, it is possible to suppress the burr from hindering positioning during the manufacturing process, or the generation of dust is suppressed, so that the quality in manufacturing can be improved. As will be described later, the recessed portion 71 of the gate opening is also used when the rotor magnet 60 is formed integrally with the shaft 1 with a thermoplastic resin.

  A tapered portion 73 and a straight portion 74 are formed on the inner peripheral surface of the hollow portion 63 of the back yoke 61, and the tapered portion 73 is narrower than the end surface 72 of the back yoke 61 on the side provided with the gate opening and is axially arranged. The straight portion 74 is formed in a straight shape from the terminal position of the tapered portion 73 to the end surface opposite to the end surface 72 (opposite end surface 75). The straight portion 74 is formed of a movable mold. As a result, resistance to sticking of the product (back yoke 61) to the movable side mold occurs at the time of mold release, and the fixed side mold is smoothly separated from the product, so that quality in manufacturing can be improved. Further, the taper portion 73 is formed of a fixed mold. As a result, the resistance of the product sticking to the fixed mold at the time of mold release is reduced, the product is smoothly separated from the mold, and the manufacturing quality can be improved. As will be described later, the straight portion 74 of the hollow portion 63 is also used when the resin magnet 69 is formed integrally with the back yoke 61.

  The end surface 72 of the back yoke 61 on the side provided with the gate opening is provided with a tapered notch 70 that reaches the hollow portion 63 with a predetermined width at the magnetic pole position between the gates. By making the distance equal to the circumference, coaxiality is secured. A structure in which the notch 70 is held by a mold ensures the coaxiality and phase when the resin magnet 69 is formed integrally with the back yoke 61 or when the rotor magnet 60 is formed integrally with the thermoplastic resin. It is possible to improve manufacturing quality.

  On the end surface 75 opposite to the end surface 72 of the back yoke 61 on the side provided with the gate opening, the sensor magnet 10 as a position detection magnet is disposed at a position separated from the opposite end surface 75 of the back yoke 61 by a predetermined distance. A pedestal 76 is formed. The pedestal 76 is formed at the position of the magnetic pole in the circumferential direction, and includes two projecting portions 76a projecting outward in the axial direction and an opening 76b formed between the two projecting portions 76a.

  The opening 76b formed in the pedestal 76 serves as a path for supplying the resin magnet 69 when the resin magnet 69 is formed integrally with the back yoke 61, and the width of the opening 76b is a runner width for supplying the resin magnet 69 ( This is substantially the same as a rib-shaped runner 77) described later.

  The rotor magnet 60 is obtained by housing the back yoke 61 in a mold and integrating the resin magnet 69 made of, for example, rare earth, or the like, on the outer periphery of the back yoke 61. When molding, by arranging a strong magnetic field outside the portion of the mold that forms the outer periphery of the resin magnet 69 and providing an orientation magnetic field, the magnetic powder contained in the resin magnet 69 is anisotropic in the polar direction. Oriented.

  In the mold for molding the resin magnet 69, the core portion inserted into the hollow portion 63 of the back yoke 61 is formed in the fixed side mold, and the core portion is inserted from the end surface 72 of the back yoke 61 on the side provided with the gate. Built into the mold. In a state where the back yoke 61 is incorporated in the mold, the end face of the core portion of the mold for molding the resin magnet 69 is located on the end face (opposite end face 75) of the back yoke 61 provided with the base 76. . Further, by providing a convex portion (a convex portion provided on the core portion of the lower mold) fitted to the notch 70 of the back yoke 61 on the core portion of the mold for molding the resin magnet 69, an orientation magnetic field is provided. Positioning in the circumferential direction is performed with respect to the position of the magnet forming the core, and when the mold is tightened, the convex portion of the core portion is pressed against the taper cutout 70 so that the coaxiality with respect to the outer periphery of the resin magnet 69 is ensured. Is done.

  In the donut-shaped runner formed on the end face of the core part of the mold for molding the resin magnet 69, the resin injection part when molding the resin magnet 69 has half the number of magnetic poles (in this embodiment, 10 poles). Half of them are provided at an equal pitch in the circumferential direction. The donut-shaped runner 78 protrudes from the end surface (opposite end surface 75) of the resin magnet 69 or the back yoke 61 toward the pedestal 76 side at approximately the axial height of the pedestal 76 of the back yoke 61. The rib-shaped runners 77 extend radially from the outer periphery of the donut-shaped runner 78 toward the resin magnet 69 in the same number as the number of magnetic poles (here, 10). The rib-shaped runner 77 is formed at a height substantially the same as the axial height of the donut-shaped runner 78.

  Here, a resin injection portion (not shown) when the resin magnet 69 is molded is disposed at an intermediate position of the rib-like runner. Since the donut-shaped runner 78 and the rib-shaped runner 77 are formed by a movable mold, the mold can be tapered at the end of the core and gradually tapered in the axial direction. Reduce sticking to the side mold. Further, with respect to the donut-shaped runner, a predetermined amount is dug into a concave shape straight from the end surface of the core (lower mold), so that the resistance of the donut-shaped runner 78 sticking to the movable mold at the time of release As a result, the manufacturing quality can be improved.

  The rib-shaped runner extending radially from the donut-shaped runner crosses the pedestal side end surface (opposite side end surface 75) of the back yoke 61 from the end surface of the core of the mold for molding the resin magnet 69, and the inner peripheral side of the pedestal 76. And extends to the position where a predetermined distance is secured from the outer periphery of the back yoke 61 at the end face of the resin magnet 69 outside the opening 76b on the outer peripheral side of the pedestal 76.

  As described above, the resin magnet 69 is injected into a donut-shaped runner forming portion (not shown), the flow direction is bent by 90 °, and the rib-shaped runner forming portion is divided into two hands for each gate. (Not shown) passes through the opening 76 b of the base 76, is further bent by 90 ° from the end of the rib-shaped runner forming portion, and flows into the outer peripheral portion of the resin magnet 69. At this time, since the portion of the resin magnet 69 that changes the flow direction can be formed by a mold, for example, when the flow direction is changed by the back yoke 61, a hole is opened in the back yoke 61 by the injection pressure. It is possible to avoid such damage as much as possible, and the quality in manufacturing can be improved. In addition, the hollow portion 63 of the back yoke 61 is straightened from the pedestal side end surface (opposite side end surface 75), and is fitted to the straight portion 74 from the pedestal side end surface of the back yoke 61 to mold the resin magnet 69. By reducing the gap of the core as much as possible, the resin 63 can be prevented from leaking into the gap between the straight portion 74 and the core of the mold for molding the resin magnet 69 from the pedestal side end surface of the hollow portion 63 of the back yoke 61. Therefore, the quality in manufacturing can be improved. When the rare earth resin magnet 69 is formed on the outer periphery of the back yoke 61, it is desirable to make the thickness of the resin magnet 69 as thin as possible because the material is expensive. However, in this case, the gate port for directly injecting the resin magnet 69 to the outer periphery also needs to be reduced in accordance with the thickness of the resin magnet 69, and the molding pressure increases as the gate port becomes smaller. On the other hand, the donut-shaped runner can arbitrarily set the gate diameter, and the manufacturing quality can be improved. In addition, by reducing the injection part of the resin magnet 69 to half of the magnetic pole, it is possible to reduce the amount of runners for the molded product, so the cost can be reduced, or when the total amount of runner return is implemented, the return ratio Since the deterioration of physical properties due to the improvement can be suppressed, the quality in production can be improved. Furthermore, by making the rib-like runners 77 the same as the number of magnetic poles, the resin magnet 69 can be injected in the same manner with respect to the magnetic poles, the orientation state can be made uniform, and the manufacturing quality can be improved.

  As will be described later, an end portion outside the back yoke 61 of the rib-like runner 77 formed on the resin magnet 69 is surrounded by a periphery when the rotor magnet 60 is integrally formed with the shaft 1 with a thermoplastic resin (resin 68). A holding projection 77a of the sensor magnet 10 is formed as a positioning projection for positioning in the direction, and a convex portion protruding from the pedestal 76 holding the outer periphery of the sensor magnet 10. For example, when the positioning projection, the holding projection 77a, and the pedestal 76 that are positioned in the circumferential direction when formed integrally with the shaft 1 are formed by only the resin magnet 69, the donut-shaped runner 78 and the rib-shaped runner 77 Since the resin magnet 69 formed on the outer periphery of the back yoke 61 is connected only by the resin injection portion, there is a weak point that the strength is weak. Further, the central part is opened and the resin magnet 69 is integrated with the pedestal 76 to improve the strength, so that the manufacturing quality can be improved.

  As described above, the resin magnet 69 is filled from the donut-shaped runner through the rib-shaped runner to the outer periphery of the back yoke 61, and after the back yoke 61 and the resin magnet 69 are integrated, the inner peripheral side of the base 76. The rotor magnet 60 is obtained by cutting away the rib-like runner 77 and the donut-like runner 78 on the inner side from the side surface.

  As shown in FIGS. 5A to 5C, the sensor magnet 10 is installed on the base 76 of the rotor magnet 60, and is molded integrally with a thermoplastic resin such as PBT. The rotor magnet resin molded part 3 shown in FIG. During resin molding of the rotor magnet 60, a state in which a notch 70 of the rotor magnet 60 is provided with a protrusion that ensures coaxiality with the mold core that forms the inner diameter of the rotor magnet resin molded part 3 Thus, by the resin molding, the coaxiality between the rotor magnet resin molded part 3 and the rotor magnet 60 is ensured. Therefore, when a long-axis-side elastic body 20 and a short-axis-side elastic body 30 described later are assembled to the rotor magnet resin molded part 3, their coaxiality is ensured and quality can be improved.

  Moreover, the inner surface of the rotor magnet resin molded part 3 is provided with a rib 67 that extends radially inward and transmits the rotational torque via an elastic body. In the illustrated example, two ribs 67 are formed. However, one or two or more ribs 67 may be used as long as they function. Further, in the present embodiment, a rotor magnet 60 is shown which is formed by integrally molding a resin magnet 69 made of sama iron on the outer periphery of the back yoke 61. For example, the rotor magnet 60 is made of a ferrite resin magnet 69 alone. Needless to say, the present invention is also applied to the case of forming 60.

  The shaft resin molded part 40 shown in FIG. 6 is obtained by placing the shaft 1 with the knurled iris 2 in a mold and molding a thermoplastic resin such as PBT. The shaft resin molded component 40 includes a cylindrical resin portion 43 that covers a part of the outer peripheral surface of the shaft 1 in a cylindrical shape, an annular flange 41 formed on the outer peripheral portion of the resin portion 43, and an outer peripheral surface of the resin portion 43. And one or more ribs 42 extending in the axial direction from the long-axis side surface 41a (surface on the elastic body pressing component 50 side) of the flange 41 and the outer peripheral surface of the resin portion 43 radially outward. And one or more ribs 47 extending in the axial direction from the short-axis side surface 41b of the flange 41. In the present embodiment, the short side (anti-load side) of the exposed portion of the shaft 1 is referred to as a short axis side, and the long side (load side) of the shaft 1 is referred to as a long axis side.

  The flange 41 is formed in the vicinity of the bearing contact surface 46 on the short axis side of the resin portion 43, and the outer diameter of the flange 41 is such that the short axis elastic body 30 when the short axis elastic body 30 is assembled. The long-axis side surface 41a near the outer periphery of the flange 41 is fitted into the rotor magnet resin molded part 3 via the elastic body 32 in the radial direction, and the elastic body 31 in the axial direction of the elastic body 30 on the short-axis side. It is comprised so that it may install in the rotor magnet resin molded part 3 via.

  The rib 47 is formed between the flange 41 and the bearing abutment surface 46, and the rib 42 extends to a position where a predetermined amount is fitted when the long-axis elastic body 20 is assembled. The outer diameter of the flange 41 and the outer diameter of the resin portion 43 are formed so as to ensure the coaxiality with the shaft 1, whereby the major axis side elastic body 20 and the minor axis side elastic body 30 rotate. When the child magnet resin molded part 3 is assembled, the coaxiality between the rotor magnet 60 and the shaft 1 is ensured, and a high-quality rotor 100 of the electric motor is obtained.

  The end of the resin part 43 on the long axis side functions as a joining part 45 in contact with the joining surface 53 formed on the inner diameter side of the elastic body pressing component 50, and the end of the resin part 43 on the short axis side is a bearing 80. It functions as a bearing contact surface 46 that contacts the inner ring. A cutout functioning as a detent 44 is formed in a part of the joint 45. When the shaft resin molded part 40 is assembled to the elastic body pressing part 50, the rotation prevention 44 is locked to the rotation stopper 58 of the elastic body pressing part 50.

  7A is a perspective view as seen from the short axis side end face 20a of the long axis side elastic body 20, and FIG. 7B is a perspective view as seen from the long axis side end face 20b of the long axis side elastic body 20. FIG. FIG. The elastic body 20 on the long axis side is obtained by molding rubber or the like, and the outer diameter portion 24 is formed so as to fit into the tapered portion 73 of the rotor magnet resin molded part 3.

  On the short-axis side end surface 20a of the long-axis side elastic body 20, a rib notch 26 that extends radially outward from the inner diameter portion 25 and into which the rib 42 of the shaft resin molded part 40 is fitted, and from the outer diameter portion 24 in the radial direction. A rib notch 23 is provided on the inner side, into which the rib 67 of the rotor magnet resin molded part 3 is fitted.

  On the long axis side end face 20b side of the elastic body 20 on the long axis side, the elastic body pressing component 50 is interposed between the elastic body pressing component 50 and the rotor magnet resin molded component 3, and the elastic body pressing component 50 moves in the radial direction. A restricting elastic body 22 in the radial direction is formed. The radial elastic body 22 is interposed between the elastic body pressing part 50 and the rotor magnet resin molded part 3 and has an axial elastic body that restricts the axial movement of the elastic body pressing part 50. 21 is formed.

  The radial elastic body 22 is formed so as to surround the outer peripheral side of the long-axis-side end surface 20 b and to be fitted into the tapered portion 73 of the rotor magnet resin molded part 3.

  The axial elastic body 21 is formed in an annular shape on the outer side in the radial direction of the radial elastic body 22 and is formed so as to contact the end surface 72 of the rotor magnet resin molded part 3.

  On the inner diameter side of the elastic body 22 in the radial direction, a fitting portion 27 for fitting the elastic body pressing component 50 is formed.

  With this configuration, the long-axis-side elastic body 20 is assembled to the rotor magnet resin molded part 3, and the elastic-body holding part 50 is assembled to the long-axis side end surface 20 b of the long-axis side elastic body 20. As a result, the elastic body 20 on the long axis side is sandwiched between the elastic body pressing component 50 and the rotor magnet resin molded component 3. In this embodiment, the elastic body is divided into two long-axis-side elastic bodies 20 and short-axis-side elastic bodies 30 that are divided in the axial direction. The elastic body 30 on the side is integrally formed, a structure corresponding to the elastic body 31 in the axial direction and the elastic body 32 in the radial direction is formed on one end side of the integrally formed elastic body, and the shaft is formed on the other end side. A structure corresponding to the radial elastic body 21 and the radial elastic body 22 is formed, and a structure corresponding to the rib notch 33, the rib notch 36, the rib notch 26, and the rib notch 23 is formed. The same effect can be obtained by forming.

  In addition, the dimensions are such that the coaxiality between the outer diameter of the outer diameter portion 24 of the elastic body 20 on the long axis side and the inner diameter of the fitting portion 27 can be secured, and each component (elastic body pressing component 50, elasticity on the long axis side). When the body 20 and the rotor magnet resin molded part 3) are assembled with dimensions such that the radial direction, the axial direction, and the circumferential direction are compressed, the rotor magnet is assembled when each part is assembled. The coaxiality between the resin molded component 3 and the shaft 1 is ensured, and the gap between the components is eliminated to prevent rattling, whereby a high-quality electric motor rotor 100 can be obtained.

  FIG. 8A is a perspective view as seen from the short axis side end face 30a of the short axis side elastic body 30, and FIG. 8B is a perspective view as seen from the long axis side end face 30b of the short axis side elastic body 30. FIG. The short-axis-side elastic body 30 is obtained by molding rubber or the like, and the outer-diameter portion 34 of the short-axis-side elastic body 30 is formed to fit into the straight portion 74 of the rotor magnet resin molded part 3. ing.

  The short-axis-side elastic body 30 is formed so as to communicate from the short-axis-side end surface 30a to the long-axis-side end surface 30b, and is for ribs into which the ribs 42 of the shaft resin molded part 40 extending radially outward from the inner diameter portion 35 are fitted. A notch 36 is provided.

  The major axis side end face 30b of the minor axis side elastic body 30 is provided with a rib notch 33 extending radially inward from the outer diameter portion 34 and into which the rib 67 of the rotor magnet resin molded part 3 is fitted.

  On the short axis side end face 30a side of the short axis side elastic body 30, it is interposed between the flange 41 of the shaft resin molded part 40 and the rotor magnet resin molded part 3, and the radial direction of the shaft resin molded part 40 The elastic body 32 in the radial direction that restricts the movement is formed. Further, the elastic body 32 in the radial direction is interposed between the flange 41 of the shaft resin molded part 40 and the rotor magnet resin molded part 3, and the axial direction restricts the movement of the shaft resin molded part 40 in the axial direction. The elastic body 31 is formed.

  The radial elastic body 32 is formed so as to surround the outer peripheral side of the short axis side end face 30 a and to be fitted into the straight portion 74 of the rotor magnet resin molded part 3.

  The axial elastic body 31 is formed in an annular shape on the radially outer side of the radial elastic body 32 and is formed so as to contact the axial end surface 79 of the straight portion 74.

  A fitting portion 37 for fitting the elastic body pressing component 50 is formed on the inner diameter side of the elastic body 32 in the radial direction.

  With this configuration, the short-axis-side elastic body 30 is assembled to the rotor magnet resin-molded part 3, and the shaft-resin-molded part 40 is assembled to the short-axis-side end surface 30a of the short-axis side elastic body 30. Thus, the elastic body 30 on the short axis side is sandwiched between the rotor magnet resin molded part 3 and the shaft resin molded part 40.

  In addition, the dimensions are such that the coaxiality between the outer diameter of the outer diameter portion 34 of the elastic body 30 on the short axis side and the inner diameter of the fitting portion 37 can be ensured, and each component (shaft resin molded part 40, elasticity on the short axis side). When the body 30 and the rotor magnet resin molded part 3) are assembled with dimensions such that the radial direction, the axial direction, and the circumferential direction are compressed, the rotor magnet is assembled when each part is assembled. The coaxiality between the resin molded component 3 and the shaft 1 is ensured, and the gap between the components is eliminated to prevent rattling, whereby a high-quality electric motor rotor 100 can be obtained.

  9A is a perspective view of the fitting portion 54 of the elastic body pressing component 50 as viewed from the long-axis side end face 54b, and FIG. 9B is a short axis side of the fitting portion 54 of the elastic body pressing component 50. It is the perspective view seen from the end surface 54a. The elastic body pressing part 50 is obtained by molding a thermoplastic resin such as PBT, and the center of the circular fitting portion 54 of the elastic body pressing part 50 is formed from the long axis side end face 54b of the elastic body pressing part 50. A cylindrical cylindrical portion 56 extending to the long axis side is formed, and a hole 52 into which the shaft 1 is fitted is formed in the cylindrical portion 56. A bearing contact surface 51 is formed at the end of the cylindrical portion 56 on the long axis side.

  The hole 52 of the cylindrical portion 56 communicates from the bearing contact surface 51 to the short shaft side end surface 54a. A recess 57 having a predetermined depth is formed in the axial direction at the center of the short-axis-side end surface 54a of the fitting portion 54 so as to be larger than the hole 52 of the cylindrical portion 56.

  The resin portion 43 of the shaft resin molded part 40 is fitted into the concave portion 57, and a joint surface 53 with which the joint portion 45 of the resin portion 43 abuts is formed at the bottom.

  A rotation stop 58 is formed on the inner peripheral surface 57 a of the recess 57. The anti-rotation 58 is formed such that the inner diameter side surface thereof is engaged with the anti-rotation 44 of the shaft resin molded part 40. By providing the rotation stopper 58, when the elastic body pressing part 50 and the shaft resin molded part 40 are assembled to the elastic body pressing part 50, they are locked to the rotation stopper 44 of the shaft resin molded part 40.

  The fitting portion 54 is formed so as to be fitted into the tapered portion 73 of the rotor magnet resin molded part 3, and the outer diameter thereof is formed so as to ensure the coaxiality with the shaft 1. When the body pressing part 50 and the rotor magnet resin molded part 3 are assembled, the coaxiality between the rotor magnet 60 and the shaft 1 is ensured, and the rotor 100 of a motor with high quality is obtained.

  Further, a flange 55 is formed in the fitting portion 54. The flange 55 is located on the long axis side of the short axis side end face 54 a of the fitting part 54, and is formed so as to surround the outer periphery of the fitting part 54. The flange 55 presses the elastic body 21 in the axial direction of the elastic body 20 on the long axis side when the elastic body pressing component 50 is assembled to the elastic body 20 on the long axis side.

  The assembly procedure of the rotor 100 will be described with reference to FIG. First, the elastic body 20 on the long axis side is inserted from the opening on the long axis side of the rotor magnet resin molded part 3, and the rib 67 of the rotor magnet resin molded part 3 is notched for the rib of the elastic body 20 on the long axis side. 23. Next, the elastic body 30 on the short axis side from the opening on the short axis side of the rotor magnet resin molded part 3 is inserted, and the rib 67 of the rotor magnet resin molded part 3 is inserted into the rib of the elastic body 30 on the short axis side. Fit into the notch 33 for use. Thus, two elastic bodies are assembled to the rotor magnet resin molded part 3.

  The shaft resin molded part 40 is inserted from the opening of the rotor magnet resin molded part 3 assembled with two elastic bodies (opening of the elastic body 30 on the short axis side), and the rib 42 of the shaft resin molded part 40 is The elastic member 30 is fitted into the rib cutout 36 of the short-axis elastic body 30 and is fitted into the rib cutout 26 of the long-axis elastic body 20.

  Furthermore, the shaft 1 on the long axis side is passed through the hole 52 of the elastic body pressing part 50 from the short-axis side end face 54a of the elastic body pressing part 50, and the rotation stopper 44 of the shaft resin molded part 40 and the elastic body pressing part 50 are rotated. Fit into the stop 58.

  Further, in a state where the joint portion 45 of the shaft resin molded part 40 is installed on the joint surface 53 of the elastic body pressing part 50, for example, by applying an adhesive or joining by ultrasonic welding, FIG. The motor rotor 100 shown is obtained.

  When the rotor 100 is assembled, if the long axis side of the shaft resin molded part 40 is positioned above the rotor magnet resin molded part 3, the long axis side elastic body 20 and the short axis side elastic body 30 are formed. Assembly can be performed in a state where the assembled rotor magnet resin molded part 3 is moved in the vertical direction (direction of gravity). The long-axis-side elastic body 20 and the short-axis-side elastic body 30 can also be assembled while being moved in the same direction. The elastic body pressing component 50 can also be assembled in the same direction. Therefore, the assembly of the rotor 100 is facilitated and the cost can be reduced.

  Further, as described above, by ensuring the coaxiality of each part, the coaxiality of the rotor magnet resin molded part 3 with respect to the shaft 1 is ensured and assembled with high accuracy, so that the quality can be improved.

  Furthermore, since the rotor magnet 60 is assembled | attached through the elastic body in the radial direction, the axial direction, and the circumferential direction, the shaft resin molded part 40 becomes possible to suppress transmission of vibration, low vibration, and low A noise motor can be obtained. Further, the rib 42 can be changed in quantity in accordance with the vibration to be suppressed, so that it is possible to respond to each application, and the quality can be improved. Even if each elastic body, shaft resin molded part 40, rotor magnet resin molded part 3 and elastic body pressing part 50 are partially or all fixed with an adhesive or the like, the present invention Applicable.

  After the bearing 80 is assembled to the rotor 100 assembled in this way, the motor 110 shown in FIG. 11 can be obtained by installing the bearing 80 on the mold stator 82 and press-fitting the bracket 81.

  FIG. 12 is a configuration diagram of the air conditioner 200 according to the embodiment of the present invention. The air conditioner 200 includes an indoor unit 210 and an outdoor unit 220 connected to the indoor unit 210. Since the electric motor 110 shown in FIG. 11 is used as the electric motor for the blower in the indoor unit 210 and the outdoor unit 220, the air conditioner 200 is reduced in noise compared to the conventional air conditioner, The quality is high and the cost can be reduced.

  As described above, the rotor 100 according to the present embodiment is formed by integrally molding a thermoplastic resin on the shaft 1 to cover a part of the shaft 1 in a cylindrical shape and elastic body (long-axis-side elastic body). 20 and the short axis side elastic body 30) and the resin part 43 interposed between the shaft 1 and one end side of the resin part 43 on one end side (short axis side) of the resin part 43. And the other end side (joint portion 45) of the other end side (major axis side) of the resin portion 43 are fitted, and the other end side of the elastic body. An elastic body pressing part 50 that holds the elastic body, and the elastic body is configured to be sandwiched between the shaft resin molded part 40 and the elastic body pressing part 50. With this configuration, it is not necessary to pass the claw portion as in the prior art through the plate portion, so high accuracy is not required in the production of the long-axis-side elastic body 20, the short-axis-side elastic body 30, and the like. Further, even if there is a manufacturing error of these elastic bodies, it can be easily assembled.

  The rotor 100 extends radially inward from the inner peripheral surface of the rotor magnet resin molded part 3 formed by integrally molding the rotor magnet 60 and the position detection sensor magnet 10 with a thermoplastic resin, and is an elastic body. And a rib 42 extending radially outward from the outer peripheral surface of the resin portion 43 and fitting into an elastic body. With this configuration, the rotational torque of the rotor magnet resin molded part 3 can be efficiently transmitted to the shaft resin molded part 40 via the elastic body.

  The elastic body is divided into two elastic bodies (long-axis-side elastic body 20 and short-axis-side elastic body 30) divided in the axial direction, and each elastic body is a rib of the rotor magnet resin molded part 3. 67 and the rib 42 of the resin part 43 are formed so as to be fitted. With this configuration, the rotational torque of the rotor magnet resin molded part 3 can be efficiently transmitted to the shaft resin molded part 40 via the elastic body.

  A fitting portion 37 into which the flange 41 of the shaft resin molded part 40 is fitted is formed on one axial end surface (short-axis side end surface 30a) of the elastic body, and the other axial end surface (short-axis) of the elastic body is formed. The side end face 20a) is formed with a fitting portion 27 into which the elastic body pressing component 50 is fitted. With this configuration, the gap between the elastic body pressing component 50 and the long-axis side elastic body 20 is reduced, and the gap between the shaft resin molded part 40 and the short-axis side elastic body 30 is reduced. The rattling between the parts is suppressed, and the motor rotor 100 with good quality can be obtained.

  Further, the fitting part 27 into which the elastic body pressing part 50 fits and the fitting part 37 into which the flange 41 of the shaft resin molding part 40 fits restricts the movement of the elastic body pressing part 50 and the shaft resin molding part 40 in the axial direction and the radial direction. The elastic body (the axial elastic body 31, the radial elastic body 32, the axial elastic body 21, and the radial elastic body 22) is formed. With this configuration, a gap between the elastic body pressing component 50 and the long-axis-side elastic body 20 can be eliminated, and a gap between the shaft resin molded component 40 and the short-axis-side elastic body 30 can be eliminated. Thus, the rotor 100 of the electric motor with higher quality can be obtained.

  Further, the rotor 100 is configured so that the bearings are brought into contact with the respective end surfaces (the bearing contact surface 51 and the bearing contact surface 46) of the elastic body pressing component 50 and the shaft resin molded component 40 (see FIG. 11). ). With this configuration, the movement of the rotor 100 in the axial direction is restricted, and vibration associated with the rotation of the rotor 100 can be further reduced.

  The rotor 100 includes a direction in which the rotor magnet resin molded part 3 assembled with the elastic body is assembled to the shaft resin molded part 40, and a direction in which the elastic body pressing part 50 is assembled to the rotor magnet resin molded part 3. Are configured to be the same. With this configuration, the assembly of the rotor 100 is facilitated, and the cost can be reduced.

  The rotor of the electric motor and the air conditioner shown in the embodiment show an example of the contents of the present invention, and can be combined with another known technique. Of course, it is possible to change and configure such that a part is omitted without departing from the gist.

  As described above, the present invention can be applied to a rotor of an electric motor and an air conditioner, and is particularly useful as an invention capable of improving quality and reducing cost.

  DESCRIPTION OF SYMBOLS 1 Shaft, 2 Knurled iris, 3 Rotor magnet resin molded part, 10 Sensor magnet, 20 Long axis side elastic body, 20a Short axis side end surface, 20b Long axis side end surface, 21 Axial elastic body, 22 Radial direction Elastic body, 23 Rib cutout, 24 Outer diameter part, 25 Inner diameter part, 26 Rib notch, 27 Fitting part, 30 Short axis side elastic body, 30a Short axis side end face, 30b Long axis side end face, 31 Axial elastic body, 32 radial elastic body, 33 rib notch, 34 outer diameter part, 35 inner diameter part, 36 rib notch, 37 fitting part, 40 shaft resin molded part, 41 flange, 41a long Shaft side surface, 41b Short shaft side surface, 42 Rib, 43 Resin part, 44 Non-rotating, 45 Joint part, 46 Bearing contact surface, 47 Rib, 50 Elastic body pressing part, 51 Bearing Contact surface, 52 holes, 53 joint surface, 54 fitting portion, 54a short shaft side end surface, 54b long shaft side end surface, 55 flange, 56 cylindrical portion, 57 recess, 57a inner peripheral surface, 58 non-rotating, 60 rotor Magnet, 61 Back yoke, 63 Hollow part, 67 Rib, 68 Resin, 69 Resin magnet, 70 Notch, 71 Recess, 71a Gate processing mark, 72 End face, 73 Taper part, 74 Straight part, 75 Opposite end face, 76 Pedestal , 76a Projection part, 76b Opening part, 77 Rib-shaped runner, 77a Holding protrusion, 78 Donut-shaped runner, 79 Axial end face, 80 Bearing, 81 Bracket, 82 Mold stator, 100 Rotor, 110 Electric motor, 200 Air conditioner 210 indoor units, 220 outdoor units.

Claims (8)

An electric motor rotor in which an elastic body is disposed between a shaft and a rotor magnet,
A thermoplastic resin is integrally formed on the shaft so as to cover a part of the shaft in a cylindrical shape, and a resin portion interposed between the elastic body and the shaft, and at one end of the resin portion, the resin portion A flange formed on the outer periphery and disposed on one end side of the elastic body, and a shaft resin molded part,
An end portion on the other end side of the resin portion is fitted, and an elastic body pressing part that presses the other end side of the elastic body, and
A recess is formed in the center of the elastic body holding part,
The resin portion is fitted into the recess, and the outer peripheral surface and the tip surface of the end portion of the resin portion are in contact with each other,
The elastic body is a rotor of an electric motor that is sandwiched between the shaft resin molded part and the elastic body pressing part. A rib extending radially inward from an inner peripheral surface of a rotor magnet resin molded part formed by integrally molding the rotor magnet and a position detection sensor magnet with a thermoplastic resin; and a rib fitted into the elastic body;
A rib extending radially outward from the outer peripheral surface of the resin portion and fitted into the elastic body;
The rotor of the electric motor according to claim 1 provided with. The elastic body is divided into two elastic bodies divided in the axial direction;
The rotor of an electric motor according to claim 2, wherein each elastic body is formed such that a rib of the rotor magnet resin molded part and a rib of the resin portion are fitted. On one end face in the axial direction of the elastic body, a fitting portion into which the flange of the shaft resin molded part fits is formed,
The rotor of the electric motor according to any one of claims 1 to 3, wherein a fitting portion into which the elastic body pressing component is fitted is formed on the other axial end face of the elastic body.   The fitting part into which the elastic body pressing part fits and the fitting part into which the flange of the shaft resin molding part fits are elastic bodies that regulate the axial and radial movements of the elastic body pressing part and the shaft resin molding part. The rotor of the electric motor according to claim 4 formed.   The rotor of an electric motor according to claim 5, wherein a bearing is brought into contact with each end face of the elastic body pressing part and the shaft resin molded part.   The direction in which the rotor magnet resin molded part assembled with the elastic body is assembled to the shaft resin molded part and the direction in which the elastic body pressing part is assembled to the rotor magnet resin molded part are the same. The rotor of the electric motor according to 6.   An air conditioner using the electric motor according to any one of claims 1 to 7 as an electric motor for a blower.

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