motor rotor

Abstract

A rotor for an electric motor according to the present disclosure is for an electric motor that provides power to rotary equipment, the rotor comprising: a rotor body which is rotatably disposed inside a stator and has a recess on one end surface in the axial direction; an adaptor which is inserted into the recess and thereby attached to the rotor body, and into which the shaft of the rotary equipment is non-rotatably inserted; and a fixing unit that detachably fixes the adaptor to the rotor body.

Description

Technical Field

[0001] The present invention relates to a rotor of an electric motor, and particularly to a rotor into which a shaft portion of a rotating device powered by the electric motor is inserted.

Background Art

[0002] Patent Document 1 below discloses a configuration in which a protrusion formed on a rotating shaft of a motor is engaged with a groove portion formed on a central axis of a cutting blade roller. Therefore, in the invention described in Patent Document 1 below, the rotational force of the rotating shaft of the motor is transmitted to the cutting blade roller, so that the cutting blade roller can be rotated.

[0003] As a configuration in which a rotating device such as a cutting blade roller and a motor are engaged, a conventional engagement configuration as shown in FIG. 7 has been known. In this engagement configuration, a shaft 102 of a rotor 101 rotatably disposed inside a stator 100 is non-rotatably inserted into an insertion hole 105 of a shaft portion 104 of a rotating device 103. In order to non-rotatably insert the shaft 102 of the rotor 101 into the insertion hole 105 of the shaft portion 104 of the rotating device 103, for example, a tapered shaft 102 is inserted into the insertion hole 105 for tapered coupling, or a shaft 102 having spline teeth is inserted into the insertion hole 105 having spline teeth for spline coupling.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the case of tapered or spline couplings, the configuration of the shaft differs depending on the configuration of the insertion holes in the rotating equipment. Therefore, a motor rotor is required for each rotating piece of equipment with a different insertion hole configuration. In this case, multiple motor rotors are needed, increasing the cost of the motor. In the case of spline couplings, the spline teeth wear down due to minute vibrations, requiring the motor to be replaced at regular intervals, which is time-consuming and costly. Therefore, there is a need for an electric motor rotor that can easily and inexpensively accommodate rotating equipment with different configurations. [Means for solving the problem]

[0006] One aspect of the present disclosure is a rotor for an electric motor that powers a rotating machine, comprising: a rotor body rotatably disposed inside a stator and having a recess on one end face in the axial direction; an adapter attached to the rotor body in a state inserted into the recess and into which the shaft of the rotating machine is inserted non-rotatably; and a fixing part for detachably fixing the adapter to the rotor body. [Effects of the Invention]

[0007] According to one embodiment, it is possible to provide a motor rotor that can be easily and inexpensively adapted to rotating equipment with different configurations. [Brief explanation of the drawing]

[0008] [Figure 1] This is a left side view showing the operating state of the rotor of an electric motor according to the first embodiment of the present invention, with a portion shown in cross-section. [Figure 2] This is a left side view showing the operating state of the rotor of an electric motor according to the first embodiment of the present invention, with a portion of the disassembled state shown in cross-section. [Figure 3] This is a front view showing the rotor of an electric motor according to the first embodiment of the present invention. [Figure 4] This is a left side view showing the operating state of the rotor of an electric motor according to a second embodiment of the present invention, with a portion shown in cross-section. [Figure 5]This is a left side view showing the usage state of a first modified example of the rotor of the electric motor according to the first embodiment, with a portion shown in cross-section. [Figure 6] This is a left side view showing the usage state of a second modified example of the rotor of the electric motor according to the first embodiment, with a portion shown in cross-section. [Figure 7] This is a longitudinal cross-sectional view showing the operating condition of a conventional electric motor rotor. [Modes for carrying out the invention]

[0009] Hereinafter, a rotor for an electric motor according to one aspect of this disclosure will be described with reference to the drawings. Referring to Figures 1 to 3, an electric motor 2 equipped with a rotor 1 of the first embodiment will be described. The electric motor 2 provides power to a rotating device 3 and is, for example, a servo motor. The electric motor 2 comprises a stator 4, a rotor 1, and a housing (not shown). Hereinafter, the axial direction J1 is defined as the front-rear direction. In this case, one end of the axial direction J1 is defined as the front side, and the other end of the axial direction J1 is defined as the rear side.

[0010] The stator 4 is held within the housing such that its axial direction J1 is aligned with the front-rear direction. The stator 4 has a contact portion 5 on one end face of the axial direction J1, which is in contact with the rotating equipment 3. The contact portion 5 is an annular shape that protrudes forward from the front surface of the stator 4. A coil (not shown) is wound around the stator 4.

[0011] A rotor 1 is provided inside the stator 4. The rotor 1 comprises a rotor body 6 rotatably positioned inside the stator 4, an adapter 7 detachably attached to the rotor body 6, and a fixing part 8 that detachably secures the adapter 7 to the rotor body 6.

[0012] The rotor body 6 is positioned inside the stator 4 such that its axial direction J1 is aligned with the front-rear direction. The rotor body 6 receives force from the rotating magnetic field generated by the voltage applied to the coils of the stator 4. This allows the rotor body 6 to rotate around its axis A. Thus, the rotor body 6 is positioned inside the stator 4 so as to be rotatable around its axis A. The rotor body 6 has a recess 10 on its front surface 9, which is one end face of the axial direction J1. The recess 10 is circular or polygonal in front view and opens forward. Multiple screw holes 11 are provided on the front surface 9 of the rotor body 6, opening forward. The multiple screw holes 11 are arranged in an annular shape on a virtual circle centered on axis A. Female threads are formed on the inner circumferential surface of each screw hole 11. Multiple insertion holes 12 are provided on the front surface 9 of the rotor body 6, opening forward. The multiple insertion holes 12 are arranged on a virtual circle centered on axis A. In this embodiment, the two insertion holes 12 are positioned on either side of the axis A.

[0013] The adapter 7 is made of iron, for example, and is cylindrical into which the shaft portion 13 of the rotating device 3 is inserted. The adapter 7 is cylindrical and opens in the axial direction J1. As shown in Figure 3, the inner circumferential surface of the adapter 7 is provided with a plurality of spline teeth 14 that protrude radially inward from the adapter 7. The plurality of spline teeth 14 are arranged in an annular shape. The adapter 7 has a plate-shaped flange 15 extending radially outward from the adapter 7 at one end of the axial direction J1. The flange 15 is provided with a plurality of through holes 16 that penetrate in the axial direction J1. The plurality of through holes 16 are arranged in an annular shape on a virtual circle centered on axis A. The flange 15 is provided with a plurality of insertion holes 17 that penetrate in the axial direction J1. The plurality of insertion holes 17 are arranged on a virtual circle centered on axis A. In this embodiment, two insertion holes 17 are positioned on either side of axis A.

[0014] The shaft portion 13 of the rotating device 3 is provided with spline teeth 18 that mesh with the spline teeth 14 of the adapter 7. The shaft portion 13 of the rotating device 3 is a rod-shaped object with a circular cross-section. Multiple spline teeth 18 are provided on the outer circumferential surface of the shaft portion 13, projecting radially outward from the shaft portion 13. The multiple spline teeth 18 are arranged in an annular shape.

[0015] The fixing part 8 has a threaded member 19 that is screwed into the rotor body 6 via the adapter 7, and a pin 20 that is inserted into the rotor body 6 via the adapter 7. In the first embodiment, the threaded member 19 is a bolt. The pin 20 is a rod with a circular cross-section.

[0016] As shown in Figures 1 and 2, to attach the adapter 7 to the rotor body 6, the adapter 7 is inserted into the recess 10 so that the flange 15 abuts against the front surface 9 of the rotor body 6. To fix the adapter 7 to the rotor body 6 in this state, the threaded member 19 is screwed into the threaded hole 11 of the rotor body 6 through the through hole 16 of the flange 15, and the pin 20 is inserted into the insertion hole 12 of the rotor body 6 through the insertion hole 17 of the flange 15. As a result, the adapter 7 is attached to the rotor body 6 in a non-rotatable and detachable manner while inserted into the recess 10 of the rotor body 6. When the adapter 7 is attached to the rotor body 6, the adapter 7 and the rotor body 6 are positioned on the same axis. In the first embodiment, the diameter of the insertion hole 12 into which the pin 20 is inserted is larger than the diameter of the insertion hole 17 through which the pin 20 passes.

[0017] The motor 2 and the rotating device 3 with such a configuration are connected by engaging the rotor 1 of the motor 2 with the shaft portion 13 of the rotating device 3. In the first embodiment, the shaft portion 13 is inserted into the adapter 7 so that the spline teeth 14 of the adapter 7 mesh with the spline teeth 18 of the shaft portion 13, whereby the rotor 1 of the motor 2 and the shaft portion 13 of the rotating device 3 are engaged. That is, the rotor 1 of the motor 2 and the shaft portion 13 of the rotating device 3 are spline-coupled. Therefore, the shaft portion 13 of the rotating device 3 is non-rotatably inserted into the adapter 7 and rotates together with the rotor body 6. Since the motor 2 and the rotating device 3 are connected in this way, power can be supplied to the rotating device 3 by rotating the rotor 1 of the motor 2. In the first embodiment, by the rotating device 3 contacting the contact portion 5 of the stator 4, it is possible to prevent the shaft portion 13 from being inserted into the adapter 7 more than necessary.

[0018] In the case of the first embodiment, the shaft portion 13 of the rotating device 3 is engaged with an adapter 7 that is detachably attached to the rotor body 6. With such a configuration, by preparing adapters 7 corresponding to the shaft portions 13 with different configurations, it is possible to connect a plurality of rotating devices 3 with different shaft portion 13 configurations to the motor 2 simply by replacing the adapter 7. Therefore, according to the rotor 1 of the first embodiment, it is possible to simply and inexpensively cope with rotating devices 3 with different shaft portion 13 configurations.

[0019] In the case of the first embodiment, when power is transmitted from the motor 2 to the rotating device 3, the shaft portion 13 of the rotating device 3 contacts the adapter 7. Therefore, according to the first embodiment, since it is the adapter 7 that wears due to contact with the shaft portion 13, only the adapter 7 needs to be replaced.

[0020] In the case of the first embodiment, the fixing portion 8 is a screw member 19 that is screwed into the rotor body 6 via the adapter 7. Therefore, according to the first embodiment, the adapter 7 can be easily attached to and detached from the rotor body 6. In the case of the first embodiment, the adapter 7 is fixed to the rotor body 6 by a plurality of screw members 19. Therefore, according to the first embodiment, when power is transmitted from the electric motor 2 to the rotating device 3, rotation of the adapter 7 with respect to the rotor body 6 can be prevented.

[0021] In the case of the first embodiment, the fixing portion 8 is a pin 20 that is inserted into the rotor body 6 via the adapter 7. Therefore, according to the first embodiment, by inserting the pin 20 into the rotor body 6, the adapter 7 can be positioned with respect to the rotor body 6. That is, the screw hole 11 of the rotor body 6 and the through hole 16 of the adapter 7 can be easily positioned. In the case of the first embodiment, the adapter 7 is fixed to the rotor body 6 by a plurality of pins 20. Therefore, according to the first embodiment, when power is transmitted from the electric motor 2 to the rotating device 3, rotation of the adapter 7 with respect to the rotor body 6 can be prevented.

[0022] In the case of the first embodiment, the diameter of the insertion hole 12 is larger than the diameter of the insertion through hole 17. With such a configuration, when the adapter 7 is removed from the rotor body 6, the pin 20 does not remain on the rotor body 6 side. Therefore, according to the first embodiment, the maintainability of the rotor 1 can be improved.

[0023] Next, a second embodiment of the rotor of the present invention will be described using FIG. 4. Note that components having the same reference numerals as those in the first embodiment may have the same functions, and thus the description may be omitted below. The rotor 1a of the second embodiment is different from the first embodiment in the configurations of the adapter 7 and the rotor body 6.

[0024] The adapter 7 has an annular spigot portion 21 on its outer circumferential surface. The spigot portion 21 is an annular shape that protrudes radially outward from the outer circumferential surface of the adapter 7 and also protrudes from the flange 15 to the other end of the axial direction J1 of the adapter 7. The recess 10 of the rotor body 6 has an annular fitting portion 22 at one end of the axial direction J1 on its inner circumferential surface into which the spigot portion 21 is inserted. The fitting portion 22 is an annular shape that protrudes radially inward from the inner circumferential surface of the recess 10.

[0025] As shown in Figure 4, the spigot portion 21 of the adapter 7 is inserted into the fitting portion 22 of the recess 10 when the adapter 7 is attached to the rotor body 6. When the spigot portion 21 of the adapter 7 is inserted into the fitting portion 22 of the recess 10, the outer circumferential surface of the spigot portion 21 of the adapter 7 is in contact with the inner circumferential surface of the fitting portion 22 of the recess 10. When the outer circumferential surface of the spigot portion 21 and the inner circumferential surface of the fitting portion 22 are in contact, a cylindrical gap 23 is formed between the outer circumferential surface of the adapter 7 and the inner circumferential surface of the recess 10.

[0026] With this configuration, the adapter 7 can be positioned relative to the rotor body 6 by inserting the spigot portion 21 into the fitted portion 22. Therefore, the rotor 1a of the second embodiment can reduce the machining area of ​​the part used for positioning compared to the case in which the adapter 7 is positioned relative to the rotor body 6 by contact between the outer surface of the adapter 7 and the inner surface of the recess 10. Therefore, the rotor 1a of the second embodiment can reduce the cost of machining. In the case of the second embodiment, the fitted portion 22 is provided in the opening of the recess 10. Therefore, the rotor 1a of the second embodiment can improve the ease of attaching and detaching the adapter 7 to the rotor body 6.

[0027] Next, modified examples of the rotor of the present invention will be described with reference to Figures 5 and 6. Note that components having the same reference numerals as those used in the first embodiment may be omitted from further description as they perform the same function.

[0028] As shown in Figure 5, the rotor 1b of the first modified example differs from the first embodiment in the configuration of the adapter 7. The adapter 7 has a flange 15 on one end of the axial direction J1, rather than in the center of the axial direction J1. Therefore, in the first modified example, one end 7a of the cylindrical portion of the adapter 7 protrudes from the flange 15. It is preferable that the length of the axial direction J1 of the adapter 7 in the first modified example is longer than the length of the axial direction J1 of the adapter 7 in the first embodiment. In this case, the rotor 1b can more reliably prevent misalignment of the axis of the shaft portion 13 of the rotating equipment 3. In addition, a sufficient contact area can be secured between the adapter 7 and the shaft portion 13 of the rotating equipment 3, reducing surface pressure, thus enabling the transmission of greater rotational force.

[0029] As shown in Figure 6, the rotor 1c of the second modified example differs from the first embodiment in the configuration of the adapter 7. In the second modified example, the tip of the shaft portion 13 of the rotating device 3 is tapered, becoming smaller in diameter towards the other end in the axial direction J1. Therefore, the inner hole 24 of the adapter 7 is tapered, becoming smaller in diameter towards the other end in the axial direction J1. With this configuration, the tapered tip of the shaft portion 13 is inserted into the inner hole 24 of the adapter 7, thereby tapering the shaft portion 13 of the rotating device 3 to the adapter 7. In this modified example, a nut member 27 is screwed onto the male threaded portion provided at the tip of the shaft portion 13. The shaft portion 13 of the rotating device 3 and the inner hole 24 of the adapter 7 are fixed together by the frictional force generated by tightening the nut member 27, so the end face 25 of the adapter 7 protrudes from the end face 26 of the shaft portion 13.

[0030] It should be noted that the present invention is not limited to the embodiments and modifications described above, and any modifications and improvements that can achieve the objectives of the present invention are included in the present invention.

[0031] For example, the adapter 7 was engaged with the shaft portion 13 of the rotating machine 3 by a spline coupling in the first embodiment or a tapered coupling in the second modified example, but is not limited to this, and only needs to be non-rotatable relative to the shaft portion of the rotating machine.

[0032] For example, the rotor 1b of the modified example 1 and the rotor 1c of the modified example 2 may be provided with a spigot joint. In this case, the inner circumferential surface of the recess 10 is provided with a fitting portion into which the spigot joint is inserted. [Explanation of symbols]

[0033] 1 Rotor 2 electric motor 3. Rotating machinery 4 Stator 6. Rotor body 7 Adapters 8 Fixed part 9 One end face 10 recesses 12 Insertion hole 13. Shaft 17 Through hole 19 Screw member 20 pins 21 Inner part 22 Fitting part

Claims

1. The rotor of an electric motor that provides power to rotating machinery, A rotor body rotatably positioned inside the stator and having a recess on one end face in the axial direction, The rotor body is attached in the recess, and the shaft portion of the rotating device is inserted so as not to rotate, and adapters corresponding to each of the shaft portions with different configurations are provided. A rotor for an electric motor, comprising a fixing part for detachably fixing the adapter to the rotor body.

2. The rotor of the electric motor according to claim 1, wherein the fixing portion is a screw member that is screwed into the rotor body via the adapter.

3. The rotor of the electric motor according to claim 2, wherein the fixing portion is a pin that is inserted into the insertion hole of the rotor body through the insertion hole of the adapter.

4. The rotor of the electric motor according to claim 3, wherein the diameter of the insertion hole is larger than the diameter of the through hole.

5. The adapter is cylindrical into which the shaft portion is inserted, and has an annular spigot portion on its outer surface that protrudes radially outward from the adapter. The rotor of an electric motor according to any one of claims 1 to 4, wherein the recess has a fitting portion at one end of the inner circumferential surface in the axial direction, which protrudes radially inward from the recess and into which the spigot portion is inserted.

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