Magnet position determining tool, method for determining position of ring magnet, and ring magnet position determining device

Abstract

To provide a technique of solving issues of an existing technique related to a motor which uses a ring magnet and easily and optimally determining a center alignment position without increasing the number of components.SOLUTION: A magnet position determining tool 5 is a tool used to determine the position of a ring magnet 8 when a motor having a ring magnet 8 is built, and is in the shape of a ring of which inner diameter is at least the outer diameter of the ring magnet 8. The magnet position determining tool has regions of the same number of N-pole parts 2 and S-pole parts 3 as the number of poles in the ring magnet 8 as a positioning target.SELECTED DRAWING: Figure 1-3

Description

[Technical field]

[0001] The present invention relates to a magnet positioning tool, a method for positioning a ring magnet, and an apparatus for positioning a ring magnet, and more particularly to a simple technology for optimal positioning in the radial direction of a motor using a ring magnet. [Background technology]

[0002] When manufacturing a motor that uses a ring magnet in the rotor, it is important that the positioning and centering is done properly, that is, that the ring magnet is optimally positioned in the radial direction. If this is not done, unintended vibrations and noise will occur in the final motor product, which is undesirable.

[0003] FIG. 6 is a cross-sectional view of a rotor in a motor using a ring magnet, showing a state in which centering, i.e., radial positioning, is optimally performed. Fig. 7 is a cross-sectional view of a rotor in a motor using a ring magnet, showing a state where centering has not been performed properly. As shown in Fig. 6, it can be said that it is an ideal state when the centers of the rotating shaft 69 and the ring magnet 68 are aligned, but such ideal positioning is not always achieved, and as shown in Fig. 7, the center position of the ring magnet 68 becomes random and may deviate from the center of the rotating shaft 69. This causes unintended vibration and noise. In light of this situation, the applicant has previously filed a patent application for a positioning method (Patent Document 1 listed below).

[0004] 8 is a cross-sectional view of a rotor in a motor using a ring magnet, showing the state where centering has been optimally performed using the method disclosed in Patent Document 1. This technology makes it unnecessary to correct the balance of the motor shaft after the motor is assembled, by attaching an annular spacer 85 to the attachment part of the ring magnet 88, and then applying adhesive to the attachment part to attach the magnet 88 to form the rotor 86. The spacer 85 is made of an elastic material of uniform thickness made of synthetic rubber or synthetic resin, such as an O-ring, and in short, the centering that aligns the center of the rotating shaft and the ring magnet is performed by adding a part such as an O-ring. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2007-143317 A "Motor shaft balancing method and rotor" Summary of the Invention [Problem to be solved by the invention]

[0006] The method shown in Figure 8 can also achieve the desired objective. However, this method requires adding positioning parts such as O-rings for each product, which increases the number of parts and increases costs, affecting the price of the final motor product. On the other hand, eliminating this part in an attempt to reduce costs can lead to the problems described in Figure 7 above. There is a demand for technology that can easily and satisfactorily perform centering positioning without the need for additional parts.

[0007] The problem that the present invention aims to solve is to provide a technology that can eliminate the problems of the conventional technology in motors that use ring magnets and can easily and optimally perform centering positioning without increasing the number of parts, thereby providing a technology that can manufacture motors that can control vibration and noise without increasing the number of manufacturing parts, and that can reduce the number of parts and manufacturing costs. [Means for solving the problem]

[0008] As a result of studying the above problems, the inventor of the present application came up with the idea of ​​providing a positioning magnet on the outer periphery of the ring magnet that requires positioning, thereby achieving optimal radial arrangement, and has completed the present invention based on this idea. That is, the invention claimed in this application, or at least the invention disclosed therein, as a means for solving the above problems, is as follows.

[0009] [1] A magnet positioning tool used to position a ring magnet when assembling a motor equipped with a ring magnet, the magnet positioning tool being ring-shaped with an inner diameter equal to or greater than the outer diameter of the ring magnet, and having the same number of north pole and south pole regions as the number of poles of the ring magnet to be positioned. [2] The magnet positioning tool according to [1], characterized in that the N-pole and S-pole regions are arranged alternately. [3] A method for positioning a ring magnet in a motor equipped with a ring magnet, which is carried out using a magnet positioning tool described in either [1] or [2], characterized in that the method includes a temporary holding process for temporarily holding the ring magnet around the motor shaft, a tool placement process for subsequently placing the magnet positioning tool on the outside of the ring magnet, and an adhesive hardening process for holding the tool in that state for a predetermined period of time to harden the adhesive between the shaft and the ring magnet.

[0010] [4] A method for positioning a ring magnet in a motor equipped with a ring magnet, which is carried out using the magnet positioning tool described in either [1] or [2], characterized in that the method includes a tool preliminary placement process in which the magnet positioning tool is placed around the motor shaft, and then a ring magnet fitting process in which the ring magnet is fitted around the outside of the shaft. [5] An apparatus for positioning a ring magnet in a motor equipped with a ring magnet using the magnet positioning tool described in either [1] or [2], characterized in that the ring magnet positioning device comprises at least one of a magnet holding means for holding the ring magnet around the axis of the motor, or a tool holding means for positioning and holding the magnet positioning tool outside the ring magnet placement position. Effect of the Invention

[0011] The magnet positioning tool, ring magnet positioning method, and ring magnet positioning device of the present invention are configured as described above, and therefore, in a motor using a ring magnet, they can easily and optimally perform centering positioning without increasing the number of parts. As a result, a motor capable of controlling vibration and noise can be manufactured using the same parts without increasing the number of manufacturing parts compared to the conventional product shown in Figure 6 above, and the number of parts and manufacturing costs can be reduced.

[0012] The magnet positioning tool, ring magnet positioning method, and ring magnet positioning device of the present invention are non-contact positioning methods that utilize magnetic action, and are also advantageous in terms of device maintainability. Furthermore, in addition to controlling and suppressing vibration and noise, which was the original impetus for the invention, in the case of a motor that is advantageous in that it has large vibrations and generated noise, the magnet positioning tool of the present invention can be easily manufactured by intentionally shifting it from the axis. In other words, a vibration motor that was previously constructed by installing an eccentric load on the end of the shaft can be constructed in the present invention with appropriate vibration and noise without the need for an eccentric load. Therefore, this invention is highly versatile. [Brief description of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view showing an example of the configuration of a magnet positioning tool of the present invention, and a ring magnet and a motor shaft for which the tool is used. FIG. [Figure 1-2] 13 is an explanatory cross-sectional view showing a state in which the motor shaft and the magnet positioning tool are aligned with each other. FIG. [Figure 1-3] FIG. 3 is an explanatory cross-sectional view showing the state in which a ring magnet is attached to the state in FIG. 1-2 and positioning is completed. [Diagram 2] 1 is a cross-sectional explanatory view showing the completed state of a rotor when the magnet positioning tool of the present invention is used offset from the motor shaft core. FIG. [Diagram 3] FIG. 2 is a flow chart showing one example of a method for positioning a ring magnet according to the present invention. [Figure 4] FIG. 11 is a flow chart showing another example of the method for positioning a ring magnet according to the present invention. [Diagram 5] 1 is a block diagram conceptually showing an example of the basic configuration of a ring magnet positioning device according to the present invention; [Figure 6] 1 is a cross-sectional view of a rotor in a motor using a ring magnet, showing a state in which centering, i.e., radial positioning, is optimally performed. [Figure 7] 1 is a cross-sectional view of a rotor in a motor using a ring magnet, showing a state in which centering is not performed properly. [Figure 8] FIG. 1 is a cross-sectional view of a rotor in a motor using a ring magnet, showing the state in which centering is optimally performed using the prior art method described above. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present invention will now be described in detail with reference to the drawings. FIG. 1 is a cross-sectional explanatory diagram showing a configuration example of a magnet positioning tool of the present invention ((a) in the figure), and a ring magnet ((b) in the figure) and a motor shaft ((b) in the figure) to which the tool is to be used. Figure 1-2 shows the motor shaft and magnet positioning tool aligned. Figure 1-3 is a cross-sectional explanatory diagram showing the state in which the ring magnet is attached to the state in Figure 1-2 and positioning is completed. As shown in these figures, the magnet positioning tool 5 is a tool used for positioning the ring magnet 8 when assembling a motor equipped with the ring magnet 8, and is mainly configured to be ring-shaped with an inner diameter equal to or larger than the outer diameter of the ring magnet 8, and to have the same number of N-pole portions 2 and S-pole portions 3 as the number of poles of the ring magnet 8 to be positioned. The reference numeral 7 in the figures denotes an adhesive layer.

[0015] An example of how to use the magnet positioning tool 5 having such a configuration will now be described. If you want to align the rotation centers of the motor shaft 9 and the ring magnet 8, align the shaft 9 and the core of the magnet positioning tool 5 beforehand, as shown in Figure 1-2. Then, in that state, fit the magnetized ring magnet 8 onto the shaft 9 as shown in Figure 1-3. Then, the magnetic poles of the magnet positioning tool 5 and the ring magnet 8 attract (repel) each other, the ring magnet 8 is positioned evenly, and the rotation centers of the shaft 9 and the ring magnet 8 are aligned.

[0016] With the centers of rotation of shaft 9 and ring magnet 8 aligned, shaft 9 and ring magnet 8 are glued and fixed together to complete rotor 6. Since there is no eccentricity between shaft 9 and ring magnet 8 in the completed rotor 6, it becomes a motor with reduced vibration and noise.

[0017] It should be noted that ring magnet 8 is already magnetized. This causes attraction (repulsion) between the magnetic poles of magnet positioning tool 5 and ring magnet 8, thereby achieving the effect of the present invention, which is a non-contact positioning method using magnetic action.

[0018] As mentioned above, the number of regions of the north pole portion 2 and the south pole portion 3 is the same as the number of poles of the ring magnet 8 to be positioned. The attraction between the north pole portion 2 of the magnet positioning tool 5 and the south pole of the ring magnet 8, and the attraction between the south pole portion 2 of the magnet positioning tool 5 and the north pole of the ring magnet 8, respectively, are regulated by magnetic action from two directions, providing good positioning.

[0019] The N-pole and S-pole regions of the magnet positioning tool 5 can be arranged alternately, and the shapes and sizes (angles) of the regions can be the same. Note that in Fig. 1 and other figures, the N-pole 2 and S-pole 3 of the magnet positioning tool 5 each have two regions, but this is merely an example and the present invention is not limited to this. The same applies to Fig. 2 described later.

[0020] The magnet positioning tool 5 is ring-shaped, and its inner diameter is equal to or larger than the outer diameter of the target ring magnet 8. In other words, the inner diameter of the magnet positioning tool 5 is at least a size that allows it to come into contact with the ring magnet 8, but considering that the intended purpose of the present invention is positioning, it is expected that there will be some gap between the tool and the ring magnet 8, so it is desirable for the inner diameter to be larger than the inner diameter of the ring magnet 8.

[0021] An appropriate adhesive can be used to bond the shaft 9 and the ring magnet 8 after the shaft 9 and the ring magnet 8 have been positioned by the magnet positioning tool 5, but the adhesive can be applied to the bonding points in advance and the positioning can be completed before the adhesive hardens, or the adhesive can be filled between the shaft 9 and the ring magnet 8 after positioning. In either case, the adhesive can form the adhesive layer 7.

[0022] What has been explained so far using Figures 1-2 and other figures is the case where you want to align the rotation axis of the shaft and the center of rotation of the ring magnet. On the other hand, if you want to position it by shifting the center, such as for the purpose of obtaining a vibration motor, you can do the same by shifting the center of the shaft 9 and the magnet positioning tool 5.

[0023] 2 is a cross-sectional explanatory diagram showing the completed state of a rotor when the magnet positioning tool of the present invention is used with the motor shaft center offset. As shown in the figure, if the ring magnet 28 is installed with the magnet positioning tool 25 and the center of the motor shaft 29 offset, the rotation shaft and the center of the ring magnet shaft are offset, which causes large vibrations and noise. However, a vibration motor can be constructed without installing an eccentric load on the shaft end.

[0024] 3 is a flow diagram showing one example of the configuration of the method for positioning a ring magnet of the present invention. The positioning method of the present invention is performed using a magnet positioning tool having any of the configurations described above, and as shown in the figure, it is composed of a temporary holding process P10 in which the ring magnet is temporarily held around the motor shaft, a tool placement process P20 in which the magnet positioning tool is placed on the outside of the ring magnet, and an adhesive hardening process P30 in which this state is held for a predetermined time to harden the adhesive between the shaft and the ring magnet.

[0025] According to this positioning method configured as above, first, the ring magnet is temporarily held around the motor shaft in the temporary holding process P10, then, in the tool arrangement process P20, a magnet positioning tool is arranged on the outside of the ring magnet, and then, in the adhesive hardening process P30, the ring magnet is held in the temporarily held state with the magnet positioning tool arranged for a predetermined time, the adhesive between the shaft and the ring magnet hardens, and the positioning of the ring magnet is completed. Note that the application of the adhesive that acts in the adhesive hardening process P30 can be considered to have been done at the start of the temporary holding process P10.

[0026] 4 is a flow chart showing another example of the configuration of the method for positioning a ring magnet of the present invention. The positioning method of the present invention is also performed using the magnet positioning tool described above, but as shown in the figure, it mainly consists of a tool preliminary placement process P40 in which the magnet positioning tool is placed around the motor shaft, and then a ring magnet fitting process P50 in which the ring magnet is fitted around the outside of the shaft.

[0027] According to this positioning method having such a configuration, first, in the tool prior arrangement process P40, the magnet positioning tool is arranged around the motor shaft, thereby aligning the shaft and the core of the magnet positioning tool in advance, and then, in this state, in the ring magnet fitting process P50, the magnetized ring magnet is fitted to the outside of the shaft. As a result, the magnetic poles between the ring magnet and the magnet positioning tool are attracted (repelled), and they are arranged in an even position and the rotation center is aligned. In this state, the shaft and the ring magnet are bonded with adhesive, and the positioning of the ring magnet is completed by the solidification of the adhesive. If it is desired to obtain a vibration motor by intentionally shifting the center of the motor shaft and the ring magnet shaft, the core of the magnet positioning tool in the tool prior arrangement process P40 can be appropriately arranged without aligning it with the motor shaft in advance.

[0028] 5 is a block diagram conceptually showing an example of the basic configuration of a ring magnet positioning device of the present invention. As shown in the figure, this ring magnet positioning device 100 is a device for positioning a ring magnet in a motor equipped with a ring magnet using a magnet positioning tool 5 of any of the configurations already described, and is mainly composed of a magnet holding means 40 that holds the ring magnet around the motor shaft, and a tool holding means 70 that positions and holds the magnet positioning tool outside the ring magnet arrangement position.

[0029] By using the ring magnet positioning device 100 configured as above, in order to position the ring magnet in a motor equipped with a ring magnet, the ring magnet can be held around the motor shaft by the magnet holding means 40, and a magnet positioning tool can be positioned and held outside the ring magnet position by the tool holding means 70. Any of the following configurations may be used: the action by the tool holding means 70 is performed after the action by the magnet holding means 40, or conversely, the action by the tool holding means 70 is performed after the action by the magnet holding means 40, or a configuration in which the actions can be performed in either order.

[0030] It should be noted that even devices lacking either the magnet holding means 40 or the tool holding means 70 are within the scope of the ring magnet positioning device of the present invention. [Industrial Applicability]

[0031] According to the magnet positioning tool, ring magnet positioning method, and ring magnet positioning device of the present invention, it is possible to facilitate and optimize centering positioning in a motor using a ring magnet without increasing the number of parts, and thus to manufacture a motor capable of controlling vibration and noise without increasing the number of manufactured parts. Therefore, this invention is highly industrially applicable in the fields of motor manufacturing and use, including servo motors, and all related fields. [Explanation of symbols]

[0032] 2, 22...N pole 3, 23…S pole part 5, 25...Magnet positioning tool 6, 26…Rotor 7, 27…Adhesive layer 8, 28…Ring magnet 9, 29...Motor shaft 40...Magnet holding means 70...tool holding means 100...Ring magnet positioning device P10…Temporary holding process P20…Equipment placement process P30…Adhesive hardening process P40…Equipment advance placement process P50…Ring magnet fitting process 66, 86...Rotor 67, 87...adhesive layer 68, 88…Ring magnet 69, 89...Motor shaft 85...Annular spacer (O-ring)

Claims

1. A magnet positioning tool used to position a ring magnet when assembling a motor having a ring magnet, comprising: The magnet is ring-shaped with an inner diameter equal to or larger than the outer diameter of the ring magnet. A magnet positioning tool having the same number of N-pole and S-pole regions as the number of poles of the ring magnet to be positioned.

2. 2. The magnet positioning tool according to claim 1, wherein the N-pole and S-pole regions are provided alternately.

3. A method for positioning a ring magnet in a motor equipped with a ring magnet, which is carried out using the magnet positioning tool according to claim 1 or 2, comprising the steps of: A temporary holding process in which the ring magnet is temporarily held around the motor shaft; a tool placement step of placing the magnet positioning tool on the outside of the ring magnet; The adhesive hardening process is performed by holding the adhesive between the shaft and the ring magnet for a predetermined time.

1. A method for positioning a ring magnet, comprising:

4. A method for positioning a ring magnet in a motor equipped with a ring magnet, which is carried out using the magnet positioning tool according to claim 1 or 2, comprising the steps of: a tool pre-positioning step of arranging the magnet positioning tool around the shaft of a motor; after that, a ring magnet fitting process for fitting a ring magnet onto the outside of the shaft; 1. A method for positioning a ring magnet, comprising:

5. 3. An apparatus for positioning a ring magnet in a motor equipped with a ring magnet, using the magnet positioning tool according to claim 1, comprising: A magnet holder for holding a ring magnet around the shaft of the motor; or a tool holding means for holding the magnet positioning tool on the outside of the ring magnet positioning position; A ring magnet positioning device comprising at least one of the above.

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