KR20180044836A - Induction motor rotor and induction motor - Google Patents

Abstract

The rotor 100-1 of the induction motor includes a rotor core 1, a shaft 2 passing through the rotor core 1, an end ring 3 provided at an end of the rotor core 1 1 and 3-2 and the shaft 2 and the inner peripheral portion 3a of the end rings 3-1 and 3-2 and the outer peripheral portion 4a is provided between the end rings 3-1 and 3-2 And the first protruding portion 3b provided on the inner peripheral portion 3a of the end rings 3-1 and 3-2 is provided with the reinforcing members 4-1 and 4-2 4-1, and 4-2 in the outer circumferential portion 4a.

Description

Induction motor rotor and induction motor

The present invention relates to a rotor and an induction motor of an induction motor.

2. Description of the Related Art In recent years, needs for a high-speed circuit for an induction motor for a machine tool have increased. In order to cope with such needs, a rotor of an induction motor needs to secure strength that can withstand centrifugal force generated at high- A conventional rotor disclosed in Patent Document 1 includes a rotor core, a conductor bar provided inside the rotor core, and an end ring provided at an end of the rotor core and connected to the conductor bar ring and a reinforcing member covering the end ring. The reinforcing member is made of a material having a stiffness higher than that of the material constituting the end ring, and has an outer annular portion which is fitted in the outer peripheral portion of the end ring. The inner peripheral portion of the outer annular portion is in contact with the outer peripheral portion of the end ring. In the conventional rotor disclosed in Patent Document 1, since the outer annular portion of the reinforcing member abuts against the outer peripheral portion of the end ring, deformation of the end ring due to the centrifugal force is suppressed.

In the rotor disclosed in Patent Document 2, a reinforcing member is provided on the inner peripheral portion of the end ring.

Patent Document 1: Japanese Patent Application Laid-Open No. 2015-159696 Patent Document 2: JP-A-59-35554

However, in the conventional rotor disclosed in Patent Document 1, when the outer annular portion of the reinforcing member is expanded in the radial direction by the end ring to be plastically deformed at the time of rotating the rotor at a high speed, It is necessary to replace the rotor in a period shorter than the design life time.

In the rotor disclosed in Patent Document 2, there is no problem that the reinforcing member is pushed in the radial direction by the end ring, and the effect of suppressing deformation of the end ring due to the centrifugal force is obtained, but is not sufficient.

An object of the present invention is to provide a rotor of an induction motor capable of suppressing a reduction in the service life of the rotor.

In order to solve the above problems and achieve the object, the rotor of the induction motor of the present invention comprises a rotor iron core, a shaft passing through the rotor iron core, an annular end ring provided at an end of the rotor iron core, And a reinforcing member provided between the shaft and the inner peripheral portion of the end ring, the outer peripheral portion contacting the end ring. And the first projecting portion provided in the inner peripheral portion of the end ring is sandwiched in the first groove portion provided in the outer peripheral portion of the reinforcing member.

INDUSTRIAL APPLICABILITY The rotor of the induction motor according to the present invention has the effect of suppressing the deterioration of the life of the rotor.

1 is a sectional view of an induction motor according to Embodiment 1 of the present invention.
2 is a sectional view of a rotor of an induction motor according to Embodiment 1 of the present invention.
3 is a sectional view taken along line III-III in Fig.
4 is a perspective view of the end ring shown in Fig.
5 is a perspective view of the reinforcing member shown in Fig.
6 is a cross-sectional view of a comparative example of a rotor of an induction motor according to Embodiment 1 of the present invention.
Fig. 7 is a view showing a state in which the end ring is deformed when the rotor of the comparative example shown in Fig. 6 is rotated. Fig.
8 is a view showing a state in which the end ring is deformed when the rotor of the induction motor according to the first embodiment of the present invention is rotated.
9 is a sectional view of a rotor of an induction motor according to Embodiment 2 of the present invention.
10 is a sectional view of a rotor of an induction motor according to Embodiment 3 of the present invention.
11 is a cross-sectional view of a rotor of an induction motor according to Embodiment 4 of the present invention.
12 is a sectional view of a rotor of an induction motor according to Embodiment 5 of the present invention.
Fig. 13 is a view showing a first modification of the rotor shown in Fig. 2. Fig.
Fig. 14 is a view showing a first modification of the rotor shown in Fig. 9. Fig.
15 is a view showing a first modification of the rotor shown in Fig.
16 is a view showing a first modification of the rotor shown in Fig.
17 is a view showing a first modification of the rotor shown in Fig.
Fig. 18 is a view showing a second modification of the rotor shown in Fig. 2;
Fig. 19 is a view showing a second modification of the rotor shown in Fig. 9. Fig.
20 is a view showing a second modification of the rotor shown in Fig.
21 is a view showing a second modification of the rotor shown in Fig.
22 is a view showing a second modification of the rotor shown in Fig.
Fig. 23 is a view showing a third modification of the rotor shown in Fig. 2;
Fig. 24 is a view showing a third modification of the rotor shown in Fig. 9;
Fig. 25 is a view showing a third modification of the rotor shown in Fig. 10;
26 is a view showing a third modification of the rotor shown in Fig.
Fig. 27 is a view showing a third modification of the rotor shown in Fig. 12;
28 is a view showing a fourth modified example of the rotor shown in Fig. 2

Hereinafter, a rotor and an induction motor of an induction motor according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to these embodiments.

Embodiment 1

1 is a sectional view of an induction motor according to Embodiment 1 of the present invention. 2 is a sectional view of a rotor of an induction motor according to Embodiment 1 of the present invention. 3 is a sectional view taken along line III-III in Fig. 4 is a perspective view of the end ring shown in Fig. 5 is a perspective view of the reinforcing member shown in Fig.

The induction motor 300 according to the first embodiment shown in Fig. 1 has a stator 200 and a rotor 100-1 provided inside the stator 200. Fig. The stator 200 includes a tubular housing 210 and a stator core 220 provided inside the housing 210. The stator core 220 has a structure in which a plurality of thin plates punched out in an annular form from an electromagnetic steel plate base material (not shown) are arranged in the axial direction of the central axis AX of the rotor core 1 D1). The plurality of thin plates are fixed to each other by caulking, welding or adhesion. A plurality of coils 230 are disposed in the stator core 220. The coil end on one end side of the coil 230 in the axial direction D1 protrudes from the one end face of the stator core 220 in the axial direction D1. The coil end on the other end side of the coil 230 in the axial direction D1 protrudes in the axial direction D1 from the other end face of the stator core 220. [

As shown in Fig. 2, the rotor 100-1 of the induction motor according to the first embodiment includes a cylindrical rotor iron core 1, a shaft 2, and a central shaft (not shown) of the rotor core 1 And an annular end ring 3-1 provided at one end 1b1 in the axial direction D1 of the base end portion AX. The rotor 100-1 has an annular end ring 3-2 provided at the other end 1b2 in the axial direction D1. The rotor 100-1 is provided between the inner peripheral portion 3a of the end ring 3-1 and the shaft 2 and the outer peripheral portion 4a is provided between the inner peripheral portion 3b of the end ring 3-1 Shaped reinforcing member (4-1) in contact with the reinforcing member (3a). The rotor 100-1 is provided between the inner peripheral portion 3a of the end ring 3-2 and the shaft 2 and the outer peripheral portion 4a is provided between the inner peripheral portion 3b of the end ring 3-2 3a). The reinforcement member (4-2) has an annular shape. Hereinafter, the end ring 3-1 and the end ring 3-2 will be referred to as end rings 3-1 and 3-2, and the reinforcement member 4-1 and the reinforcement member 4-2 May be referred to as reinforcing members 4-1 and 4-2.

The end rings 3-1 and 3-2 each have an annular first protruding portion 3b provided in each inner circumferential portion 3a. Each of the reinforcing members 4-1 and 4-2 has an annular first groove portion 4b in each outer peripheral portion 4a. The first groove portion 4b has a shape in which the first projection portion 3b is fitted. The outer diameter of the first groove portion 4b is the same as the inner diameter of the first projection portion 3b. The width of the first groove portion 4b in the axial direction D1 is the same as the width of the first projection portion 3b in the axial direction D1.

The rotor iron core 1 is constituted by laminating a plurality of thin plates punched out in an annular shape from an electromagnetic steel plate base material not shown in the axial direction D1. The plurality of thin plates are fixed to each other by caulking, welding or adhesion. The rotor core 1 includes a plurality of core slots 5 arranged on the outer circumferential surface of the rotor core 1 and arranged in the axial direction D2 of the central axis AX and a plurality of core slots 5 And a conductor bar (6) provided on each of the first and second electrodes. Each of the plurality of core slots 5 extends in the axial direction D1 and extends from one end 1b1 of the rotor core 1 to the other end 1b2.

The plurality of core slots 5 provided in the rotor core 1 are each skewed in the axial circumferential direction D2. One end 6a in the axial direction D1 of the conductor bar 6 provided in the core slot 5 is connected to the end 3c of the end ring 3-1 on the side of the rotor iron core 1 . The other end 6b in the axial direction D1 of the conductor bar 6 provided in the core slot 5 is connected to the end 3c of the end ring 3-2 on the rotor iron core 1 side .

As the material of the end ring 3-1, the end ring 3-2 and the conductor bar 6, a conductive material such as aluminum, an aluminum alloy, copper, or a copper alloy can be exemplified. And the end rings 3-1 and 3-2 are formed by die casting using the conductor material. Each of the end rings 3-1 and 3-2 has the same outer diameter as the outer diameter of the rotor core 1. [ The inner peripheral portion 3a of the end ring 3-1 is in contact with the outer peripheral portion 4a of the reinforcing member 4-1. The inner peripheral portion 3a of the end ring 3-2 abuts the outer peripheral portion 4a of the reinforcing member 4-2.

The centrifugal force acting on an object depends not only on the radius and angular velocity of the object but also on the mass of the object. It is necessary that the reinforcing members 4-1 and 4-2 are made less deformable with respect to the centrifugal force in order to suppress deformation of the end rings 3-1 and 3-2 due to the centrifugal force and thermal expansion. Therefore, a material having a higher tensile strength per unit mass than the materials of the end rings 3-1 and 3-2 is used for the reinforcing members 4-1 and 4-2. Specifically, as the material of the reinforcing members 4-1 and 4-2, iron, titanium or carbon fiber-reinforced plastic can be exemplified. Each of the reinforcing members 4-1 and 4-2 has through holes 4c. The shaft 2 passes through the respective through holes 4c of the reinforcing members 4-1 and 4-2 and the through hole 1a of the rotor iron core 1. [

The reinforcing member 4-1 is first attached to the one end 1b1 of the rotor iron core 1 and the other end 1b2 of the rotor iron core 1 is fitted The reinforcing member 4-2 is mounted. Next, the end rings 3-1 and 3-2 are formed by die-casting using a conductor material so that the first projecting portion 3b is fitted in the first groove portion 4b and the reinforcing member 4 -1 and 4-2 and the end rings 3-1 and 3-2 are integrally formed. The state in which the reinforcing members 4-1 and 4-2 and the end rings 3-1 and 3-2 are integrally molded is a state in which the first groove portion 4b of the reinforcing members 4-1 and 4-2, The first protruding portions 3b of the end rings 3-1 and 3-2 are fitted in contact with each other. That is, the first protruding portion 3b is inserted into the first groove portion 4b. The through hole 4c of the reinforcing member 4-1 and the through hole 4c of the reinforcing member 4-2 and the through hole 1a of the rotor iron core 1 are finished to the same dimensions, The shaft 2 is tightly fitted to the inside of the through hole 4c and the through hole 1a. In Embodiment 1, the shaft 2 is shrink-fitted to the inside of the through hole 4c and the through hole 1a.

The reinforcing members 4-1 and 4-2 and the end rings 3-1 and 3-2 are integrally molded so that the reinforcing members 4-1 and 4-2 and the end rings 3-1 and 3-2 The time for assembling the reinforcing members 4-1 and 4-2 and the end rings 3-1 and 3-2 to the shaft 2 is shorter than that in assembling the shaft 2 separately to the shaft 2 . In addition, by shrinking the reinforcing members 4-1 and 4-2 and the end rings 3-1 and 3-2 to the shaft 2, the reinforcing members 4-1 And the outer peripheral portion of the shaft 2 is increased. This frictional force suppresses the movement of the reinforcing members 4-1 and 4-2 in the axial direction D1 during high-speed rotation of the rotor 100-1 and during thermal expansion. This enhances the reinforcing effect of the end rings 3-1 and 3-2 by the reinforcing members 4-1 and 4-2, as compared with the case where the shrink fitting is not performed. The reinforcing effect is an effect of suppressing deformation of the end rings 3-1 and 3-2 due to centrifugal force and thermal expansion by the reinforcing members 4-1 and 4-2.

The reinforcing effect of the rotor 100-1 will be described in detail with reference to Figs. 6 to 8. Fig. 6 is a cross-sectional view of a comparative example of a rotor of an induction motor according to Embodiment 1 of the present invention. The difference between the rotor 100A shown in Fig. 6 and the rotor 100-1 shown in Fig. 2 is as follows.

(1) The rotor 100A includes the end rings 3-1A and 3-2A instead of the end rings 3-1 and 3-2 shown in Fig. The inner circumferential portion 3a of the end rings 3-1A and 3-2A is not provided with the first protruding portion 3b shown in Fig.

(2) The rotor 100A includes the reinforcing members 4-1A and 4-2A in place of the reinforcing members 4-1 and 4-2 shown in Fig. The outer peripheral portion 4a of the reinforcing members 4-1A and 4-2A is not provided with the first groove portion 4b shown in Fig.

The outer diameter of each of the outer peripheral portions 4a of the reinforcing member 4-1A and the reinforcing member 4-2A is set to be larger than the outer diameter of each of the inner peripheral portions 3a of the end ring 3-1A and the end ring 3-2A It is the same as the inner diameter. The width of each of the reinforcing member 4-1A and the reinforcing member 4-2A in the axial direction D1 is set such that the axial direction D1 of each of the end ring 3-1A and the end ring 3-2A ). ≪ / RTI >

The reinforcing member 4-1A is first mounted on one end 1b1 of the rotor core 1 and the other end 1b2 of the rotor core 1 is fitted on the other end 1b2 of the rotor core 1, (4-2A) is mounted. Next, the end rings 3-1A and 3-2A are formed by die-casting using a conductor material, whereby the end ring 3-1A and the reinforcing member 4-1A are integrally molded, (3-2A) and the reinforcing member (4-2A) are integrally formed. The through hole 4c of the reinforcing member 4-1A and the through hole 4c of the reinforcing member 4-2A and the through hole 1a of the rotor iron core 1 are finished to the same dimensions, The shafts 2 are shrink-fitted into the through-holes 4c and the through-holes 1a.

Fig. 7 is a view showing a state in which the end ring is deformed when the rotor of the comparative example shown in Fig. 6 is rotated. Fig. 7 shows the outline of the end ring 3-1A when the rotor 100A is stopped and the outline of the deformed end ring 3-1A when the rotor 100A is rotating at a high speed, ) Is represented by a dotted line.

The outer peripheral portion 4a of the reinforcing member 4-1A contacts the inner peripheral portion 3a of the end ring 3-1A by integrally molding the end ring 3-1A and the reinforcing member 4-1A, A frictional force is generated between the outer peripheral portion 4a of the reinforcing member 4-1A and the inner peripheral portion 3a of the end ring 3-1A. This frictional force has a function of suppressing deformation of the end ring 3-1A during rotation of the rotor 100A and thermal expansion. Here, at the time of high-speed rotation and thermal expansion of the rotor 100A, a force that spreads outward in the radial direction D3 acts on the end ring 3-1A. The inner ring of the end ring 3-1A moves in the axial direction D1 against the frictional force because the end ring 3-1A is deformed with a point of connection with the conductor bar 6 as a point, And the outer peripheral portion of the ring 3-1A moves in the radial direction D3.

In particular, since the amount of deformation of the end ring 3-1A increases as the rotational speed of the rotor 100A increases, the amount of deformation of the end ring 3-1A The stress amplitude becomes large. Whenever the rotation and stop of the rotor 100A are repeated or the rotation speed of the rotor 100A changes, the connection point between the end ring 3-1A and the conductor bar 6 is subjected to centrifugal force and thermal expansion The metal fatigue at the connection point proceeds. The inner ring and outer ring of the end ring 3-1A are repeatedly expanded and contracted by repeating the rotation and stopping of the rotor 100A, so that the metal fatigue in the end ring 3-1A also proceeds. Therefore, it may be necessary to exchange the rotor 100A for a period shorter than the design life.

8 is a view showing a state in which the end ring is deformed when the rotor of the induction motor according to the first embodiment of the present invention is rotated. 8 shows the outline of the end ring 3-1 when the rotor 100-1 is stopped and the outline of the end ring 3-1 when the rotor 100-1 is rotating at a high speed, (3-1) is represented by a dotted line. In the rotor 100-1, the first protrusion 3b and the first groove 4b are integrally formed and the first protrusion 3b is engaged with the first groove 4b Fit) structure.

The engaging structure widens the contact area between the inner peripheral portion 3a of the end ring 3-1 and the outer peripheral portion 4a of the reinforcing member 4-1 as compared with the rotor 100A shown in Fig. The frictional force between the inner peripheral portion 3a of the ring 3-1 and the outer peripheral portion 4a of the reinforcing member 4-1 is higher than that of the rotor 100A shown in Fig.

In addition, when the end ring 3-1 moves in the axial direction D1 by the fitting structure, the first protruding portion 3b is caught in the first groove portion 4b. Therefore, the deformation amount of the end ring 3-1 in the axial direction D1 and the radial direction D3 is smaller than that of the rotor 100A shown in Fig. Therefore, in the first embodiment, the reinforcing effect of the end rings 3-1 and 3-2 by the reinforcing members 4-1 and 4-2 is higher than that of the rotor 100A shown in Fig. 7, The stress amplitude occurring in the end rings 3-1 and 3-2 is reduced, and the fatigue life of the end rings 3-1 and 3-2 can be improved.

In the rotor 100-1 according to the first embodiment, when the rotor 100-1 is rotated at a high speed, the outer annular portion of the reinforcing member does not undergo plastic deformation as in the conventional rotor shown in Patent Document 1, Deterioration of the reinforcing effect by the end rings 3-1 and 3-2 is suppressed, and deterioration of the life of the rotor 100-1 is suppressed.

In the rotor 100-1 according to the first embodiment, one of the above-described engaging structures is provided at each of both ends of the shaft 2. However, the engaging structure may be formed by arranging two or more . In the rotor 100-1 according to the first embodiment, the both ends of the shaft 2 are provided with a fitting structure, but when both ends of the shaft 2 are asymmetric, the end of one end of the shaft 2 It may be provided that only the fitting structure is provided. Even in such a configuration, the effect of suppressing deformation of the end ring 3-1 or the end ring 3-2 at least at the position can be obtained.

In the rotor 100-1 according to the first embodiment, the first groove portion 4b and the first protrusion portion 3b are formed in an annular shape. However, the first groove portion 4b is formed by the reinforcing member 4- And the first protruding portion 3b is constituted as a plurality of recesses arranged in the axial circumferential direction D2 in the circumferential direction D2 of the end rings 3-1 and 3-2, It is also possible to constitute a plurality of projections. However, when the first groove portion 4b and the first protrusion portion 3b are provided in an annular shape, the deformation of the end rings 3-1 and 3-2 is uniformly suppressed in the axial direction D2, The effect of improving the life of the rotor 100-1 can be obtained at the best.

Embodiment 2 Fig.

9 is a sectional view of a rotor of an induction motor according to Embodiment 2 of the present invention. The difference between the rotor 100-1 according to the first embodiment and the rotor 100-2 according to the second embodiment is as follows.

(1) In the rotor 100-2, each of the end rings 3-1 and 3-2 has a plurality of first protrusions 3b. The plurality of first protruding portions 3b provided in the end ring 3-1 are separated from each other in the axial direction D1 and provided in the inner peripheral portion 3a of the end ring 3-1. The plurality of first protrusions 3b provided in the end ring 3-2 are mutually separated in the axial direction D1 and provided in the inner circumferential portion 3a of the end ring 3-2.

(2) In the rotor 100-2, each of the reinforcing members 4-1 and 4-2 includes a plurality of first groove portions 4b. The plurality of first groove portions 4b provided in the reinforcing member 4-1 are provided at the outer peripheral portion 4a of the reinforcing member 4-1 so as to be apart from each other in the axial direction D1. The plurality of first groove portions 4b provided in the reinforcing member 4-2 are separated from each other in the axial direction D1 and provided in the outer peripheral portion 4a of the reinforcing member 4-2.

The end rings 3-1 and 3-2 are formed by die casting using a conductor material. As a result, the end rings 3-1 and 3-2 and the reinforcing member 4-1 are integrally formed. The second embodiment has a fitting structure in which a plurality of first protruding portions 3b are fitted into the first groove portions 4b. As a result, the contact area between the inner peripheral portion 3a of the end ring 3-1 and the outer peripheral portion 4a of the reinforcing member 4-1 is wider than that of Embodiment 1, and the end rings 3-1 and 3 -2 between the inner peripheral portion 3a of the reinforcing members 4-1 and 4-2 and the outer peripheral portion 4a of the reinforcing members 4-1 and 4-2 is higher than that of the first embodiment. The amount of deformation of the end rings 3-1 and 3-2 in the axial direction D1 and the radial direction D3 is smaller than that in the first embodiment. Therefore, according to the second embodiment, it is expected to further improve the fatigue life of the end rings 3-1 and 3-2.

Embodiment 3:

10 is a sectional view of a rotor of an induction motor according to Embodiment 3 of the present invention. The difference between the rotor 100-1 according to the first embodiment and the rotor 100-3 according to the third embodiment is as follows.

(1) The first protruding portion 3b of the rotor 100-3 is provided with the annular second protruding portion 3b1 in the inner peripheral portion 3a1 of the first protruding portion 3b.

(2) In the first groove portion 4b of the rotor 100-3, the annular second groove portion 4b1 is provided in the outer peripheral portion 4a1 of the first groove portion 4b.

The width of the second protruding portion 3b1 in the axial direction D1 is narrower than the width of the first protruding portion 3b in the axial direction D1 and the width of the second groove portion 4b1 in the axial direction D1 Is narrower than the width of the first groove portion 4b in the axial direction D1.

The end rings 3-1 and 3-2 are formed by die casting using a conductor material. As a result, the first protrusion 3b and the first groove 4b are integrally formed, and the second protrusion 3b1 and the second groove 4b1 are integrally formed. The third embodiment has a structure in which the first projection 3b is fitted in the first groove 4b and the second projection 3b1 is fitted in the second groove 4b1. This enlarges the contact area between the inner peripheral portion 3a of the end rings 3-1 and 3-2 and the outer peripheral portion 4a of the reinforcing members 4-1 and 4-2 as compared with the first embodiment, The frictional force between the inner peripheral portion 3a of the end rings 3-1 and 3-2 and the outer peripheral portion 4a of the reinforcing members 4-1 and 4-2 is higher than in the first embodiment. The first protruding portion 3b is engaged with the first groove portion 4b and the second protruding portion 3b1 is caught by the second groove portion 4b1. The deformation amounts of the end rings 3-1 and 3-2 in the axial direction D1 and the radial direction D3 are smaller than those in the first embodiment. Therefore, according to the third embodiment, it is possible to further improve the fatigue life of the end rings 3-1 and 3-2.

Embodiment 4.

11 is a cross-sectional view of a rotor of an induction motor according to Embodiment 4 of the present invention. The difference between the rotor 100-1 according to the first embodiment and the rotor 100-4 according to the fourth embodiment is as follows.

(1) The reinforcing members 4-1 and 4-2 of the rotor 100-4 are arranged in the outer peripheral portion 4a and in the outer peripheral portion 4a2 of the rotor iron core 1 side relative to the first groove portion 4b Is larger than the outer diameter OD2 of the outer peripheral portion 4a3 on the side opposite to the rotor iron core 1 as compared with the first groove portion 4b. The width in the axial direction D1 of the outer peripheral portion 4a2 is equal to the width in the axial direction D1 of the outer peripheral portion 4a3.

In the rotor 100-4, the end rings 3-1 and 3-2 are thermally expanded and deformed. Thereafter, the end rings 3-1 and 3-2 are thermally shrunk to an initial position before thermal expansion I'm going to come back. Here, thermal expansion and heat shrinkage of the end ring 3-1 in the axial direction D1 are considered. The end ring 3-1 expands outward in the axial direction D1 when thermally expanded and contracts toward the rotor iron core 1 side in the axial direction D1 when the heat shrinks. The force applied to the reinforcing member 4-1 by the end ring 3-1 will be considered. When the end ring 3-1 undergoes thermal expansion and heat shrinkage, stress is also applied between the shrinkage-fitted reinforcing member 4-1 and the shaft 2.

Of the two sidewalls in the axial direction D1 formed by providing the first groove portion 4b of the reinforcing member 4-1 on the side wall opposite to the rotor iron core 1, -1) is applied. Since the outer diameter OD2 of the rotor 100-4 is smaller than the outer diameter dimension OD1, the end ring 3-1 thermally expands and the reinforcing member 4-1 is moved outward in the axial direction D1 The stress to be extruded can be reduced. On the other hand, at the time of heat shrinkage, a force is applied to the sidewall of the rotor iron core 1 side from the two sidewalls toward the rotor iron core 1 side in the axial direction D1. Since the outer diameter dimension OD1 is larger than the outer diameter dimension OD2, the stress applied to the end ring 3-1 by heat shrinking and returning the reinforcing member 4-1 to the rotor core 1 side can be reduced. That is, the reinforcing member 4-1 at the time of thermal expansion of the end ring 3-1 is provided with the rotor core 1 and the reinforcing member 4-1 from the position where the reinforcing member 4-1 is shrink- A stress which is deviated in the opposite direction acts. On the other hand, the reinforcing member 4-1 at the time of heat shrinking of the end ring 3-1 is moved from the position where the reinforcing member 4-1 is shrink-fitted to the shaft 2 toward the rotor iron core 1 The stress is applied. If the reinforcing member 4-1 is displaced to the opposite side of the rotor iron core 1 from the above position because the force at the time of thermal expansion is large, the reinforcing member 4-1, The end ring 3-1, which is integrally formed, becomes difficult to return to its original shape. As a result, the end ring 3-1 is deformed, leading to deterioration of the life of the rotor.

The stress acting between the reinforcing member 4-1 and the shaft 2 at the time of heat shrinking of the end ring 3-1 in the rotor 100-4 according to the fourth embodiment is smaller than the stress acting between the end ring 3-1 -1 is greater than the stress acting between the reinforcing member 4-1 and the shaft 2 at the time of thermal expansion of the reinforcing member 4-1 and the end ring 3-1, . The same applies to the end ring 3-2 and the reinforcing member 4-2. Therefore, in the rotor 100-4, even if the positions of the reinforcing members 4-1 and 4-2 in the axial direction D1 are deviated during the thermal expansion, the end rings 3-1 and 3-2, By this heat shrinking, the effect of returning the reinforcing members 4-1 and 4-2 to the initial position before thermal expansion can be expected.

The fourth embodiment can be combined with any of the first to third embodiments.

Embodiment 5:

12 is a sectional view of a rotor of an induction motor according to Embodiment 5 of the present invention. The difference between the rotor 100-1 according to the first embodiment and the rotor 100-5 according to the fifth embodiment is as follows.

(1) The reinforcing members 4-1 and 4-2 of the rotor 100-5 are formed in the outer peripheral portion 4a of the outer peripheral portion 4b of the rotor iron core 1 on the opposite side of the first trench portion 4b, The outer diameter OD2 of the outer circumferential portion 4a3 is larger than the outer diameter OD1 of the outer circumferential portion 4a2 of the rotor iron core 1 side than the first groove portion 4b. The width in the axial direction D1 of the outer peripheral portion 4a2 is equal to the width in the axial direction D1 of the outer peripheral portion 4a3.

Since the outer diameter OD2 of the rotor 100-5 is larger than the outer diameter OD1 when centrifugal force acts on the end rings 3-1 and 3-2 or when the centrifugal force acts on the end rings 3-1 and 3-2, It is possible to suppress the deformation amount of the end rings 3-1 and 3-2 in the direction opposite to the direction of the center of the rotor iron core 1 when thermal expansion of the end rings 3-1 and 3-2 occurs. Therefore, the reinforcing effect of the end rings 3-1 and 3-2 can be further enhanced. The fifth embodiment can be combined with any of the first to third embodiments.

Embodiment 6:

In Embodiment 6, a first modification of Embodiments 1 to 5 will be described. Fig. 13 is a view showing a first modification of the rotor shown in Fig. 2. Fig. The difference between the rotor 100-1 shown in Fig. 2 and the rotor 100-6A shown in Fig. 13 is as follows.

(1) The first groove portion 4b of the rotor 100-6A has the first inclined face 4d at the end portion of the first groove portion 4b opposite to the rotor core 1.

(2) The first protruding portion 3b of the rotor 100-6A has the second inclined surface 3d at the end of the first protruding portion 3b opposite to the rotor core 1. The second inclined surface 3d is in contact with the first inclined surface 4d.

The first inclined surface 4d of the reinforcing member 4-1 has a shape widening from the reinforcing member 4-2 toward the reinforcing member 4-1 in the axial direction D1. The first inclined surface 4d of the reinforcing member 4-2 has a shape widening from the reinforcing member 4-1 to the reinforcing member 4-2 in the axial direction D1. The second inclined face 3d of the end ring 3-1 has a shape widening from the end ring 3-2 toward the end ring 3-1 in the axial direction D1. The second inclined face 3d of the end ring 3-2 has a shape widening from the end ring 3-1 toward the end ring 3-2 in the axial direction D1.

Fig. 14 is a view showing a first modification of the rotor shown in Fig. 9. Fig. The difference between the rotor 100-2 shown in Fig. 9 and the rotor 100-6B shown in Fig. 14 is as follows.

(1) In the rotor 100-6B, each of the plurality of first groove portions 4b has a first inclined face 4d at an end portion of the first groove portion 4b opposite to the rotor iron core 1 Respectively.

(2) In the rotor 100-6B, each of the plurality of first protruding portions 3b is provided with a second inclined surface 3d at an end portion of the first protruding portion 3b opposite to the rotor iron core 1 Respectively. The second inclined surface 3d is in contact with the first inclined surface 4d.

15 is a view showing a first modification of the rotor shown in Fig. The difference between the rotor 100-3 shown in Fig. 10 and the rotor 100-6C shown in Fig. 15 is as follows.

(1) In the rotor 100-6C, each of the first trench 4b and the second trench 4b1 is connected to the rotor core 1 of the first trench 4b and the second trench 4b1, Has a first inclined surface (4d) at the opposite end.

(2) In the rotor 100-6C, each of the first protruding portion 3b and the second protruding portion 3b1 is connected to the rotor core 1 of the first protruding portion 3b and the second protruding portion 3b1, And a second inclined surface 3d at the opposite end. The second inclined surface 3d is in contact with the first inclined surface 4d.

16 is a view showing a first modification of the rotor shown in Fig. The difference between the rotor 100-4 shown in Fig. 11 and the rotor 100-6D shown in Fig. 16 is as follows.

(1) The first groove portion 4b of the rotor 100-6D has a first inclined face 4d at an end portion of the first groove portion 4b opposite to the rotor core 1.

(2) The first protruding portion 3b of the rotor 100-6D has the second inclined surface 3d at the end of the first protruding portion 3b opposite to the rotor core 1. The second inclined surface 3d is in contact with the first inclined surface 4d.

17 is a view showing a first modification of the rotor shown in Fig. The difference between the rotor 100-5 shown in Fig. 12 and the rotor 100-6E shown in Fig. 17 is as follows.

(1) The first groove portion 4b of the rotor 100-6E has the first inclined face 4d at the end portion of the first groove portion 4b opposite to the rotor core 1.

(2) The first protruding portion 3b of the rotor 100-6E has the second inclined surface 3d at the end of the first protruding portion 3b opposite to the rotor core 1. The second inclined surface 3d is in contact with the first inclined surface 4d.

The effect of suppressing deformation during rotation due to the friction between the inner peripheral portion 3a of the end rings 3-1 and 3-2 and the outer peripheral portion 4a of the reinforcing members 4-1 and 4-2, (AX) is high. Therefore, in order to enhance the effect of suppressing the deformation during rotation, it is preferable to increase the contact area having an angle with respect to the central axis AX.

According to Embodiment 6, since the first groove portion 4b has the first inclined face 4d and the first projection portion 3b has the second inclined face 3d, the end rings 3-1 and 3 The area of the surface having the angle with the central axis AX at the contact area between the inner peripheral portion 3a of the reinforcing members 4-1 and 4-2 and the outer peripheral portion 4a of the reinforcing members 4-1 and 4-2 The frictional force between the inner peripheral portion 3a of the end rings 3-1 and 3-2 and the outer peripheral portion 4a of the reinforcing members 4-1 and 4-2 is larger than that of Embodiments 1 to 5 . As a result, the reinforcing effect of the end rings 3-1 and 3-2 can be further enhanced.

Embodiment 7:

In Embodiment 7, a second modification of Embodiments 1 to 5 will be described. Fig. 18 is a view showing a second modification of the rotor shown in Fig. 2; The difference between the rotor 100-1 shown in Fig. 2 and the rotor 100-7A shown in Fig. 18 is as follows.

(1) The first groove portion 4b of the rotor 100-7A has a first inclined face 4d1 at an end of the first groove portion 4b on the rotor iron core 1 side.

(2) The first protruding portion 3b of the rotor 100-7A has the second inclined surface 3d1 at the end of the first protruding portion 3b on the rotor iron core 1 side. The second inclined plane 3d1 contacts the first inclined plane 4d1.

The first inclined surface 4d1 of the reinforcing member 4-1 has a shape that widens from the reinforcing member 4-1 toward the reinforcing member 4-2 in the axial direction D1. The first inclined surface 4d1 of the reinforcing member 4-2 has a shape that widens from the reinforcing member 4-2 toward the reinforcing member 4-1 in the axial direction D1. The second inclined face 3d1 of the end ring 3-1 has a shape widening from the end ring 3-1 toward the end ring 3-2 in the axial direction D1. The second inclined face 3d1 of the end ring 3-2 has a shape widening from the end ring 3-2 toward the end ring 3-1 in the axial direction D1.

Fig. 19 is a view showing a second modification of the rotor shown in Fig. 9. Fig. The difference between the rotor 100-2 shown in Fig. 9 and the rotor 100-7B shown in Fig. 19 is as follows.

(1) In the rotor 100-7B, each of the plurality of first groove portions 4b has a first inclined face 4d1 at an end of the first groove portion 4b on the side of the rotor iron core 1 .

(2) In the rotor 100-7B, each of the plurality of first protruding portions 3b has the second inclined surface 3d1 at the end of the first protruding portion 3b on the side of the rotor iron core 1 . The second inclined plane 3d1 contacts the first inclined plane 4d1.

20 is a view showing a second modification of the rotor shown in Fig. The difference between the rotor 100-3 shown in Fig. 10 and the rotor 100-7C shown in Fig. 20 is as follows.

(1) In the rotor 100-7C, each of the first trench 4b and the second trench 4b1 is connected to the rotor iron core 1 (1) of each of the first trench 4b and the second trench 4b1 And the first inclined surface 4d1 is provided at the end of the second inclined surface 4d.

(2) In the rotor 100-7C, each of the first protruding portion 3b and the second protruding portion 3b1 is connected to the rotor iron core 1 (1) of each of the first protruding portion 3b and the second protruding portion 3b1, And a second inclined surface 3d1 at an end of the second inclined surface 3d1. The second inclined plane 3d1 contacts the first inclined plane 4d1.

21 is a view showing a second modification of the rotor shown in Fig. The difference between the rotor 100-4 shown in Fig. 11 and the rotor 100-7D shown in Fig. 21 is as follows.

(1) The first groove portion 4b of the rotor 100-7D has the first inclined face 4d1 at the end of the first groove portion 4b on the rotor iron core 1 side.

(2) The first protruding portion 3b of the rotor 100-7D has the second inclined surface 3d1 at the end of the first protruding portion 3b on the rotor iron core 1 side. The second inclined plane 3d1 contacts the first inclined plane 4d1.

22 is a view showing a second modification of the rotor shown in Fig. The difference between the rotor 100-5 shown in Fig. 12 and the rotor 100-7E shown in Fig. 22 is as follows.

(1) The first groove portion 4b of the rotor 100-7E has the first inclined face 4d1 at the end of the first groove portion 4b on the rotor iron core 1 side.

(2) The first protruding portion 3b of the rotor 100-7E has the second inclined surface 3d1 at the end of the first protruding portion 3b on the rotor iron core 1 side. The second inclined plane 3d1 contacts the first inclined plane 4d1.

According to Embodiment 7, since the first groove portion 4b has the first inclined face 4d1 and the first projection portion 3b has the second inclined face 3d1, the end rings 3-1 and 3 The contact area between the inner peripheral portion 3a of the end rings 3-1 and 2-2 and the outer peripheral portion 4a of the reinforcing members 4-1 and 4-2 is wider than that of Embodiments 1 to 5, The frictional force between the inner peripheral portion 3a of the reinforcing members 4-1 and 4-2 and the outer peripheral portion 4a of the reinforcing members 4-1 and 4-2 is higher than that of the first to fifth embodiments. As a result, the reinforcing effect of the end rings 3-1 and 3-2 can be further enhanced.

Embodiment 8:

In Embodiment 8, a third modification of Embodiments 1 to 5 will be described. Fig. 23 is a view showing a third modification of the rotor shown in Fig. 2; In the rotor 100-8A shown in Fig. 23, the first groove portion 4b has the first inclined face 4d of the sixth embodiment and the first inclined face 4d1 of the seventh embodiment. In the rotor 100-8A, the first protruding portion 3b has the second inclined surface 3d of the sixth embodiment and the second inclined surface 3d1 of the seventh embodiment.

Fig. 24 is a view showing a third modification of the rotor shown in Fig. 9; The rotor 100-8B shown in Fig. 24 has a first inclined face 4d of the sixth embodiment and a first inclined face 4d1 of the seventh embodiment, each of the plurality of first groove portions 4b. Each of the plurality of first protrusions 3b of the rotor 100-8B has the second inclined surface 3d of the sixth embodiment and the second inclined surface 3d1 of the seventh embodiment.

Fig. 25 is a view showing a third modification of the rotor shown in Fig. 10; The rotor 100-8C shown in Fig. 25 is different from the rotor 100-8C shown in Fig. 25 in that each of the first groove portion 4b and the second groove portion 4b1 has the first inclined face 4d of Embodiment 6 and the first inclined face 4d1 ). The rotor 100-8C has the first protruding portion 3b and the second protruding portion 3b1 each provided with the second inclined surface 3d of the sixth embodiment and the second inclined surface 3d1 of the seventh embodiment do.

26 is a view showing a third modification of the rotor shown in Fig. In the rotor 100-8D shown in Fig. 26, the first groove portion 4b includes the first inclined face 4d of the sixth embodiment and the first inclined face 4d1 of the seventh embodiment. In the rotor 100-8D, the first protruding portion 3b has the second inclined surface 3d of the sixth embodiment and the second inclined surface 3d1 of the seventh embodiment.

Fig. 27 is a view showing a third modification of the rotor shown in Fig. 12; In the rotor 100-8E shown in Fig. 27, the first groove portion 4b includes the first inclined face 4d of the sixth embodiment and the first inclined face 4d1 of the seventh embodiment. In the rotor 100-8E, the first protruding portion 3b has the second inclined surface 3d of the sixth embodiment and the second inclined surface 3d1 of the seventh embodiment.

According to Embodiment 8, the first groove portion 4b has the first inclined surface 4d and the first inclined surface 4d1 and the first projection portion 3b has the second inclined surface 3d and the second inclined surface 3d1, The contact area between the inner peripheral portion 3a of the end rings 3-1 and 3-2 and the outer peripheral portion 4a of the reinforcing members 4-1 and 4-2 is set to be larger than that The frictional force between the inner peripheral portion 3a of the end rings 3-1 and 3-2 and the outer peripheral portion 4a of the reinforcing members 4-1 and 4-2 is larger than that of Embodiments 1 to 5 . As a result, the reinforcing effect of the end rings 3-1 and 3-2 can be further enhanced.

In Embodiments 1 to 8, the reinforcing member is provided with a groove portion, but the reinforcing member may be configured as follows. Fig. 28 is a view showing a fourth modified example of the rotor shown in Fig. 2; The rotor 100-9 shown in Fig. 28 is provided with reinforcing members 4-1B and 4-2B instead of the reinforcing members 4-1 and 4-2, and the end rings 3-1 and 3- 2), the end rings 3-1B and 3-2B are provided.

The reinforcing member 4-1B includes a first annular portion 41 provided on the side opposite to the rotor iron core 1 of the reinforcing member 4-1B and a second annular portion 41 provided on the rotor core 4-1B of the reinforcing member 4-1B And a second annular portion 42 provided on the first annular portion 42 side. The outer diameter of the second annular portion (42) is smaller than the outer diameter of the first annular portion (41). Therefore, a stepped portion is formed between the first annular portion 41 and the second annular portion 42. The first reinforcing member 4-2B is configured similarly to the reinforcing member 4-1B.

The inner peripheral portion 3a of the end ring 3-1B formed by die casting is in contact with the outer peripheral portion 4a of each of the first annular portion 41 and the second annular portion 42. [ At this time, the end portion 3e of the first protruding portion 3b on the side opposite to the rotor iron core 1 is connected to the end portion 4e of the first annular portion 41 on the side of the rotor iron core 1, 1 abut the stepped portion between the annular portion 41 and the second annular portion 42. That is, the first protruding portion 3b is sandwiched between the stepped portions. Therefore, in the end ring 3-1B at the time of rotation, since the first protruding portion 3b is caught in the stepped portion, the effect of suppressing the deformation of the end ring 3-1B at the time of rotation is obtained. The same effect is also obtained in the end ring 3-2B at the time of rotation.

When the outer diameter of the second annular portion 42 is smaller than the outer diameter of the first annular portion 41, the effect of increasing the bonding area is obtained as compared with the comparative example shown in Fig. 7. However, Since the first protruding portion 3b of the first protruding portion 3-1B is not caught by the stepped portion, the effect of suppressing deformation during rotation is not sufficiently obtained.

The configuration shown in the above embodiments represents one example of the content of the present invention and can be combined with other known technologies and a part of the configuration can be omitted or changed without departing from the gist of the present invention Do.

1: rotor iron core 1a, 4c: through hole
1b1, 6a: one end portion 1b2, 6b: one end portion
2: Shaft
3-1, 3-1A, 3-1B, 3-2, 3-2A, 3-2B: End ring
3a, 3a1: Inner main portion 3b: First protrusion
3b1: second protrusion 3c: end
3d, 3d1: second inclined surface 3e, 4e: section
4-1, 4-1A, 4-1B, 4-2, 4-2A, 4-2B:
4a, 4a1, 4a2, 4a3:
4b: first groove portion 4b1: second groove portion
4d, 4d1: first inclined plane 5: core slot
6: conductor bar 41: first annular portion
42: second annular portion
100-1, 100-2, 100-3, 100-4, 100-5, 100-6A, 100-6B, 100-6C, 100-6D, 100-6E, 100-7A, 100-7B, 100- 7C, 100-7D, 100-7E, 100-8A, 100-8B, 100-8C, 100-8D, 100-8E, 100-9,
300: induction motor 200: stator
210: housing 220: stator core
230: Coil AX: Center axis
D1: Axial direction D2: Axial circumferential direction
D3: Diameter OD1, OD2: Outer diameter dimension

Claims (10)

A rotor iron core,
A shaft passing through the rotor iron core,
An annular end ring provided at an end of the rotor iron core,
And an annular reinforcing member provided between the shaft and the inner peripheral portion of the end ring and having an outer peripheral portion in contact with the end ring,
Wherein a first projection portion provided on an inner peripheral portion of the end ring is fitted in a first groove portion provided on an outer peripheral portion of the reinforcing member. The method according to claim 1,
Wherein the first protruding portion and the first groove portion are provided in an annular shape, respectively. The method according to claim 1 or 2,
Wherein the end ring includes a second protrusion provided on an inner peripheral portion of the first protrusion,
Wherein the reinforcing member has a second groove portion which is provided on an outer peripheral portion of the first groove portion and into which the second projection portion is fitted,
The width of the second projection part in the axial direction of the central axis of the rotor iron core is narrower than the width of the first projection part in the axial direction,
And the width of the second groove portion in the axial direction is narrower than the width of the first groove portion in the axial direction. The method according to any one of claims 1 to 3,
The reinforcing member is characterized in that an outer diameter dimension of the outer peripheral portion of the reinforcing member and an outer peripheral portion of the rotor iron core side on the side of the first groove portion is larger than an outer diameter dimension of the outer peripheral portion of the first groove portion on the side opposite to the rotor iron core The rotor of the induction motor. The method according to any one of claims 1 to 3,
The reinforcement member is characterized in that an outer diameter dimension of the outer peripheral portion of the reinforcing member on the side opposite to the rotor iron core than that of the first groove portion is larger than an outer diameter dimension of the outer peripheral portion of the rotor iron core on the side of the first groove portion The rotor of the induction motor. The method according to any one of claims 1 to 5,
Wherein the first groove portion has a first inclined surface at an end portion of the first groove portion in the axial direction of the center axis of the rotor iron core,
Wherein the first protruding portion has a second inclined surface which is in contact with the first inclined surface at an end of the first protruding portion in the axial direction. A rotor iron core,
A shaft passing through the rotor iron core,
An annular end ring provided at an end of the rotor iron core,
And an annular reinforcing member provided between the shaft and the inner peripheral portion of the end ring and having an outer peripheral portion in contact with the end ring,
The reinforcing member
A first annular portion provided on the opposite side of the rotor iron core of the reinforcing member,
And a step portion provided on the rotor iron core side of the reinforcing member and having a second annular portion whose outer diameter is smaller than the outer diameter of the first annular portion,
And a first protruding portion provided on an inner peripheral portion of the end ring is sandwiched between the stepped portion. The method of claim 7,
Wherein the first protruding portion, the first annular portion, and the second annular portion are provided in an annular shape, respectively. The method according to any one of claims 1 to 8,
Wherein the end ring and the reinforcing member are provided at both ends of the rotor iron core. An induction motor having the rotor of the induction motor according to any one of claims 1 to 9.

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