ROTOR AND MOTOR

Abstract

Rotor (10) comprising: a tubular rotor core (12) manufactured by layering disc-shaped electromagnetic steel plates (121) on top of each other, attached to a rotating axis (11) and comprising several through-holes (122) spaced apart from each other in a circumferential direction (D2) of the rotor core (12) and extending along an axial direction (D1) of the rotating axis (11); and Connecting rods (14, 15), each of which is press-fitted into the through holes (122), wherein the connecting rods (14, 15) are formed by several rod-shaped elements (141, 142, 151, 152, 153) which are arranged in a row along the axial direction (D1), and The possibility exists that the positions of the separating joints (140, 150) between the rod-shaped elements (141, 142, 151, 152, 153) lying next to each other in the axial direction (D1) coincide in the axial direction (D1) for all connecting rods (14, 15) in order to reduce the risk of the rotor core (12) breaking at the position of the separating joints (140, 150) due to the reaction to the torque resulting from the rotation of the rotor (10).

Description

BACKGROUND OF THE INVENTION Area of ​​the invention

[0001] The present invention relates to rotors and motors. Related technology

[0002] Traditionally, a motor rotor is known to consist of a rotor core in which annular (disc-shaped, circular, plate-like) electromagnetic steel plates are stacked in layers along an axial direction, and end plates are arranged at its two ends and are attached to a rotating axis. The electromagnetic steel plates and the end plates of the rotor core include through-holes at several circumferentially spaced locations, extending along the axial direction; and pins are press-fitted into the through-holes so that they are connected to them (see, for example, patent literature 1).

[0003] The end plates are used to increase the rotor's strength and to connect it to the axis of rotation, among other things. Pins longer than the rotor core are used, which prevents the rotor from breaking when torque is applied by the motor.

[0004] Patent literature 2, as the closest prior art, describes a large lamination structure of a rotor fan strip for an asynchronous motor, comprising a rotor fan strip, a drawbolt, a stop pin, a rotor clamping ring, a rotor ventilation tray plate, a rotor end plate, and an inclined key. Patent literature 3 describes a rotor and the simplification of the fastening operations between the rotor core and a shaft by providing longitudinal holes along the rotor near the central hole for connecting the rotor core to the shaft and by pressing pin elements into the holes. Patent literature 4 describes a structure of a laminated stator core or rotor core of a motor formed by pressing a spring pin with tapered longitudinal ends.

[0005] Patent literature 5 describes the assembly of a stator core of a motor by galloping an insertion rod with an eyelet.

[0006] Patent literature 6 describes a stator core with pronounced poles, which is installed outside a rotor with permanent magnets. Patent literature 1: JP 2016 - 163 468 A Patent Literature 2: CN 1 02 005 842 A Patent literature 3: JP H04 - 178 131 A Patent literature 4: WO 89 / 04 078 A1 Patent literature 5: JP S62 - 268 330 A Patent literature 6: JP H11 - 234 928 A SUMMARY OF THE INVENTION

[0007] Although a long rotor core requires pins that are longer than the rotor core, standard products cannot be used, making a rotor expensive.

[0008] It is an object of the present invention to provide a rotor and a motor to which standard products can be easily applied pins.

[0009] The problem described above is solved by the features of the independent claims. Preferred embodiments are defined by the dependent claims. (1) The present invention relates to a rotor (for example, a rotor 10 described later) comprising: a tubular rotor core (for example, a rotor core 12 described later) which is produced by stacking disc-shaped electromagnetic steel plates (for example, electromagnetic steel plates 121 described later) in layers, is attached to an axis of rotation (for example, an axis of rotation 11 described later) and comprises several through holes (for example, through holes 122 described later) which are spaced apart from one another in a circumferential direction (for example, a circumferential direction D2 described later) of the rotor core and extend along an axial direction (for example, an axial direction D1 described later) of the axis of rotation;and connecting rods (for example, connecting rods 14 and 15 described later), each of which is press-fitted into the through holes, wherein the connecting rods are formed by several rod-shaped elements (for example, rod-shaped elements 141, 142, 151, 152 and 153 described later) arranged in a row along the axial direction, and there is no possibility that the positions of separating joints (for example, separating joints 140 and 150 described later) between the rod-shaped elements lying next to each other in the axial direction coincide in the axial direction for all connecting rods. (2) In the rotor according to (1) it is preferably not possible that the positions of the separation joints in the axial direction coincide in the circumferential direction of the connecting bars lying next to each other. (3) In the rotor according to (2) the lengths of the rod-shaped elements of each of the connecting rods preferably differ from one another. (4) A motor (for example, a motor 1 described later) comprises the rotor according to any one of points (1) to (3) and a cylindrical stator (for example, a stator 20 described later) in which the rotor is arranged.

[0010] According to the present invention, it is possible to provide a rotor and a motor to which standard products can be easily applied pins. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a front view showing a schematic configuration of an engine according to an embodiment of the present invention; Fig. 2 is a sectional view along line AA according to Fig. 1; Fig. Figure 3 is a schematic view of several connecting rods contained within a rotor; and Fig. Figure 4 is a schematic view of several connecting rods contained in a rotor according to a further embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following is with reference to the Fig. 1 to 3 describe an embodiment of a rotor and a motor according to the present invention.

[0012] Fig. Figure 1 is a front view showing a schematic configuration of a motor 1 according to an embodiment of the present invention. Fig. 2 is a sectional view along line AA according to Fig. 1. Fig. Figure 3 is a schematic view of several connecting rods 14A to 14L contained in a rotor 10.

[0013] The one in the Fig. 1 and Fig. The motor 1 shown in the present embodiment comprises the rotor 10 and a stator 20. The rotor 10 comprises a rotating axis 11, a rotor core 12, two end plates 13 and the connecting rods 14A to 14L.

[0014] The pivot axis 11 is a rod-shaped body. The pivot axis 11 is held on both sides in one axial direction by (not shown) bearings on the (not shown) housing of the motor 1 in such a way that the pivot axis 11 can be rotated. In other words, the pivot axis 11 can be rotated about an axial center. Fig. Figure 2 shows the center point CL of the axis of rotation 11, represented by a line of alternating long and short dashes. In the following description, the axis direction of the axis of rotation 11 is also simply referred to as "axis direction D1".

[0015] The rotor core 12 is formed by stacking disc-shaped (ring-shaped, circular, plate-like) electromagnetic steel plates 121 in layers along the axial direction D1 in the form of a cylinder (a tube). In the drawing, the thickness of the electromagnetic steel plates 121 is exaggerated and shown as being greater than the actual thickness. The rotor core 12 is attached to the outer circumferential surface of the axis of rotation 11, which is arranged in a central section along a radial direction D3. The rotor core 12 includes several through-holes 122.

[0016] The through-holes 122 are designed as openings extending along the axial direction D1 from one end face of the rotor core 12 to the other end face, and the through-holes 122 have substantially the same cross-sectional area. The through-holes 122 are spaced apart from one another along the circumferential direction D2 of the rotor core 12. In other words, the through-holes 122 are arranged at substantially uniform intervals on an imaginary circle R1 around the center of rotation CL of the axis of rotation 11 (the center of rotation of the rotor core 12). The "substantially uniform intervals" include not only exactly uniform intervals, but also intervals that can be considered functionally uniform (the same applies to the following description).

[0017] The end plates 13 are arranged at both ends of the rotor core 12 in the axial direction D1 such that they, together with the rotor core 12, form the shape of a cylinder (a tube). The end plates 13 are attached to the outer circumferential surface of the axis of rotation 11, which is arranged in the radial direction D3 in the central section. The end plates 13 include several through holes 131.

[0018] The through-holes 131 are designed as openings extending along the axial direction D1 and have essentially the same cross-sectional area. The through-holes 131 are spaced apart along the circumferential direction D2 of the rotor core 12 and run continuously along the axial direction D1 with the through-holes 122 of the rotor core 12. In other words, the through-holes 131 are arranged at essentially uniform intervals on the imaginary circle R1 around the center of rotation CL of the axis of rotation 11 (the center of rotation of the rotor core 12).

[0019] With regard to the individual through-holes (131 and 122), the individual connecting rods 14A to 14L are press-fitted in the specified sequence into the through-holes 131 of one end plate 13, the through-holes 122 of the rotor core 12, and the through-holes 131 of the other end plate 13. As shown in Fig. As shown in Figure 3, each of the connecting bars 14A to 14L is formed by a rod-shaped element 141 with a length L1 and a rod-shaped element 142 with a length L2, arranged in a row. Unless a special distinction between the connecting bars 14A to 14L is required, they are also simply referred to as "connecting bars 14". The connecting bars 14 include separation joints 140 between the rod-shaped elements 141 and 142, which are adjacent to each other in the axial direction D1.

[0020] The lengths L1 of the rod-shaped elements 141 and the lengths L2 of the rod-shaped elements 142 differ from each other (the individual lengths differ from each other) such that the connecting rods 14A to 14L with the separation joints 140 have the relationship L1 ≠ L2. It is not possible for the positions of the separation joints 140 of the connecting rods 14A to 14L to coincide in the axial direction D1 for all twelve connecting rods 14A to 14L. It is also not possible for the positions of the separation joints 140 of the connecting rods 14A to 14L to coincide in the axial direction D1 for the connecting rods 14 that are adjacent in the circumferential direction D2 (for example, connecting rods 14A and 14B).

[0021] The stator 20 is attached to the (not shown) housing of the motor 1. The stator 20 comprises a stator core 21 and coils 22.

[0022] The stator core 21 is essentially cylindrical in shape. The stator core 21 is manufactured by stacking several electromagnetic steel plates in layers along the axial direction D1.

[0023] The coils 22 are wound around the stator core 21. The coils 22 are formed, for example, by U-phase, V-phase, and W-phase coils 22. The parts of the coils 22 that project in the axial direction D1 on both sides of the stator core 21 are assumed to be coil ends 23. Fig. Figure 1 shows several coils 22 in the form of a cylinder, schematically and in one piece.

[0024] The rotor 10 and the motor 1 according to the present embodiment achieve, for example, the following results. The rotor 10 according to the present embodiment comprises: the tubular rotor core 12, which is manufactured by stacking the disk-shaped electromagnetic steel plates 121 in layers, is attached to the axis of rotation 11, and comprises several through-holes 122 spaced apart from one another in the circumferential direction D2 of the rotor core 12 and extending along the axial direction D1 of the axis of rotation 11; and the connecting rods 14, each of which is press-fitted into the through-holes 122.The connecting rods 14 are formed by several rod-shaped elements 141 and 142, which are arranged in a row along the axis direction D1, and it is not possible for the positions of the separating joints 140 between the rod-shaped elements lying next to each other in the axis direction D1 to coincide in the axis direction D1 for all connecting rods 14.

[0025] Therefore, at every position of the rotor core 12 in the axial direction D1, there is a section where there are no separation joints 140 of the connecting rods 14A to 14L. In this way, it is possible to reduce the risk of breakage of the rotor core 12 at the position of the separation joints 140 due to the reaction to the torque resulting from the rotation of the rotor 10. Although long pins are required for a long rotor core 12, short pins, which are standard and inexpensive products, are arranged in a row in such a way that they can be used. In other words, with the present embodiment, it is possible to provide the rotor 10 and the motor 1 in which standard pins can be easily used.

[0026] It is also not possible for the positions of the separation joints 140 in the axial direction D1 to coincide on the connecting bars 14 lying side by side in the circumferential direction D2. Therefore, the reaction to the torque resulting from the rotation of the rotor 10 can be distributed. In this way, it is possible to further reduce the risk of the rotor core 12 breaking at the position of the separation joints 140.

[0027] In each of the through-holes 122, the lengths of the rod-shaped elements 141 and 142 differ from one another. Therefore, when press-fitting the connecting rods 14A to 14L, the order of the rod-shaped elements 141 and 142 with their different lengths L1 and L2 is reversed, thus easily preventing the positions of the separation joints 140 contained in the connecting rods 14A to 14L from coinciding in the axial direction D1.

[0028] Then, with reference to Fig. 4. An engine 1 according to a further embodiment serving as a modification is described. In the description of the modification, configurations that correspond, for example, to those according to the embodiment described above are designated by the same reference numerals, and therefore their description is omitted. The description of the modification does not include a description of results that correspond to the results obtained by the embodiment described above.

[0029] Fig. Figure 4 is a schematic view of several connecting bars 15A to 15L contained in a rotor 10 according to a further embodiment. The rotor 10 according to the present embodiment differs from the embodiment described above in that, instead of connecting bars 14A to 14L, it contains connecting bars 15A to 15L. Unless a specific distinction between the connecting bars 15A to 15L is required, they are also simply referred to as "connecting bars 15".

[0030] The individual connecting rods 15A to 15L are press-fitted in the specified sequence into the through holes 131 of one end plate 13, the through holes 122 of one rotor core 12, and the through holes 131 of the other end plate 13. As shown in Fig. As shown in Figure 4, each of the connecting bars 15A to 15L is formed by a rod-shaped element 151 with length La, a rod-shaped element 152 with length Lb, and a rod-shaped element 153 with length Lc, arranged in a row. The connecting bars 15 include separation joints 150 and 150 between the rod-shaped elements 151, 152, and 153, which lie side by side in the axial direction D1.

[0031] For the connecting rods 15A to 15L with the separation joints 150, the length La of the rod-shaped elements 151, the length Lb of the rod-shaped elements 152, and the length Lc of the rod-shaped elements 153 differ from one another. The individual lengths exhibit the relationship La ≠ Lb ≠ Lc, and they also exhibit the relationships La + Lb ≠ Lc, Lb + Lc ≠ La, and Lc + La ≠ Lb. It is not possible for the positions of the separation joints 150 of the connecting rods 15A to 15L to coincide in the axial direction D1 for all twelve connecting rods 15A to 15L. Even with the connecting bars 15 lying next to each other in the circumferential direction D2 (for example, the connecting bars 15A, 15B and 15C), it is not possible for the positions of the separation joints 150 of the connecting bars 15A to 15L to coincide in the axial direction D1.For the twelve connecting rods 15A to 15L, the parts where the positions of the separation joints 150 of the connecting rods 15A to 15L differ in the axial direction D1 are numbered N of the types (in this case according to . Fig. 4 applies N = 3) of the rod-shaped elements in relation to each other, and thus the number of positions is 12 · (N-1 / N). When the motor 1 generates a torque, the reaction to the torque applied to the interfaces 150 of the connecting rods 15A to 15L is distributed over the parts where the positions of the interfaces 150 of the connecting rods 15A to 15L differ in the axial direction D1, making it possible to increase the lower limit of the strength of the rotor core 12 by increasing the number N of the types of rod-shaped elements.

[0032] The present invention is not limited to the embodiments described above, and various modifications and alterations are possible. Although, for example, in the embodiment described above, all connecting rods 14A to 14L have the separating joints 140, there is no limitation to this configuration. In other words, at least one of the connecting rods 14A to 14L can have the separating joints 140. The connecting rod can be formed from four or more (four or more types of) rod-shaped elements. For each of the connecting rods, the arrangement pattern of the lengths of the rod-shaped elements can be changed as required. Although the position of end sections of the rod-shaped elements in a longitudinal direction and a position in the direction of the thickness of the electromagnetic steel plates according to Fig.If 2 are covered, there is no restriction on this configuration, and they do not have to overlap. EXPLANATION OF THE REFERENCE SYMBOLS 1 engine 10 Rotor 11 axis of rotation 12 rotor core 14, 15 Connecting rod 20 Stator 121 electromagnetic steel plate 122 Through hole 140, 150 Separation joint 141, 142, 151, 152, 153 rod-shaped element D1 Axis direction D2 circumferential direction

Claims

[1] Rotor (10) comprising: a tubular rotor core (12) manufactured by stacking disc-shaped electromagnetic steel plates (121) in layers, attached to a rotating axis (11) and comprising several through-holes (122) spaced apart in a circumferential direction (D2) of the rotor core (12) and extending along an axial direction (D1) of the rotating axis (11); and Connecting rods (14, 15), each of which is press-fitted into the through holes (122), wherein the connecting rods (14, 15) are formed by several rod-shaped elements (141, 142, 151, 152, 153) which are arranged in a row along the axial direction (D1), and The possibility exists that the positions of the separating joints (140, 150) between the rod-shaped elements (141, 142, 151, 152, 153) lying next to each other in the axial direction (D1) coincide in the axial direction (D1) for all connecting rods (14, 15) in order to reduce the risk of the rotor core (12) breaking at the position of the separating joints (140, 150) due to the reaction to the torque resulting from the rotation of the rotor (10). [2] Rotor (10) according to claim 1, wherein there is no possibility that the positions of the separation joints (140, 150) in the axial direction (D1) coincide in the connecting bars (14, 15) lying next to each other in the circumferential direction (D2). [3] Rotor (10) according to claim 1 or 2, wherein the lengths of the rod-shaped elements (141, 142, 151, 152, 153) differ from each other in each of the connecting rods (14, 15). [4] Motor (1) comprising: the rotor (10) according to any one of claims 1 to 3 and a cylindrical stator (20) in which the rotor (10) is arranged.

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