Magnetizing device and magnetizing method

Abstract

The present application provides a magnetizing device and a magnetizing method. The magnetizing device (10) has a holding member (12), a coil member (14) and a coil fixing portion (18), wherein the holding member (12) has a rotor fixing portion (16) holding a rotor (100); the coil member (14) has a thin plate-shaped support plate (26) and a coil (28) built in the inside of the support plate (26); and the coil fixing portion (18) is arranged on the holding member (12) and is used for fixing a plurality of coil members (14) radially relative to the center of the rotor fixing portion (16). Accordingly, the waste of the equipment can be inhibited.

Description

Technical Field

[0001] This invention relates to a magnetization device and a magnetization method for magnetizing the rotor of an electric motor. Background Technology

[0002] Electric vehicles, which emit no greenhouse gases (GHG) and boast excellent environmental performance, are attracting attention. These vehicles are powered by high-output electric motors. Furthermore, aircraft and various operational machines are being electrified, and in the field of general equipment, a shift from engines to electric motors is underway.

[0003] Even in motors, PM motors, which typically have permanent magnets on the rotor, are generally considered to have excellent efficiency and high environmental performance. The rotors used in such motors undergo a magnetization process in the final stage of manufacturing to magnetize the magnetic materials. For example, Japanese Patent Publication No. 2005-224055 discloses a magnetization apparatus and method for magnetizing a multi-pole magnetic material arranged on a rotor. Summary of the Invention

[0004] As the applications of electric motors increase, the diameter and number of poles of rotors are becoming more diverse. In existing technologies, magnetization devices are required according to the type of rotor; therefore, the increase in rotor types leads to increased equipment waste.

[0005] The purpose of this invention is to solve the above-mentioned technical problems.

[0006] The following discloses a magnetization device having a holding member, a coil member, and a coil fixing part, wherein the holding member is used to hold a rotor having a magnetic body; the coil member has a thin plate-shaped support plate and a coil wound inside the support plate and along the plane of the support plate; the coil fixing part configures and fixes the coil member to the outer periphery of the rotor in such a way that the direction of the current of the portion of the coil closest to the magnetic body is aligned with the axial direction of the rotor, the coil member generates a concentric magnetic field around the coil according to the right-hand rule, and magnetizes the magnetic body through the concentric magnetic field.

[0007] Another approach is a magnetization method comprising a coil configuration step and a magnetization step. In the coil configuration step, a coil component is configured on the outer periphery of a rotor having a magnetic body. The coil component has a thin plate-shaped support plate and a coil wound inside the support plate and along the plane of the support plate. In the magnetization step, the magnetic body is magnetized by supplying current to the coil component. The coil configuration step is arranged and fixed such that the direction of the current in the portion of the coil closest to the magnetic body is aligned with the axial direction of the rotor. The magnetization step generates a concentric magnetic field around the coil according to the right-hand rule and magnetizes the magnetic body through the concentric magnetic field.

[0008] The magnetization device and magnetization method described above can flexibly handle rotors with various diameters and pole numbers, thus reducing equipment waste.

[0009] The above-described objectives, features, and advantages should be readily understood from the following description of the embodiments with reference to the accompanying drawings. Attached Figure Description

[0010] Figure 1 This is a perspective view of the magnetization device involved in the embodiment.

[0011] Figure 2 yes Figure 1 A three-dimensional view of the coil component.

[0012] Figure 3 yes Figure 1 Top view of the retaining component.

[0013] Figure 4 This is an explanation Figure 1 A diagram illustrating the function of the magnetization device. Detailed Implementation

[0014] The magnetizing device 10 according to this embodiment is used to magnetize the rotor 100. The rotor 100 is used, for example, in a PM motor. The rotor 100 has a rotor body 102 made of a soft magnetic material and a magnetic body 104 that is the object to be magnetized. The magnetic body 104 is a hard magnetic body, which becomes a permanent magnet when magnetized by the magnetization method of this embodiment. The rotor 100 has a cylindrical shape. On the outer periphery of the rotor 100, a plurality of magnetic bodies 104 are arranged at equal intervals along the circumferential direction. The number of magnetic bodies 104 arranged in the circumferential direction is the same as the number of poles of the rotor 100. The magnetic bodies 104 are magnetized radially, for example, with the outer periphery side as the N pole or the outer periphery side as the S pole. The rotor 100 is magnetized such that the magnetic bodies 104 with the outer periphery side magnetized as the N pole and the magnetic bodies 104 with the outer periphery side magnetized as the S pole alternate in the circumferential direction.

[0015] The magnetizing device 10 includes a holding member 12, a coil member 14, a rotor fixing part 16, and a coil fixing part 18. The upper end of the holding member 12 has a flat mounting surface 12a. The holding member 12 has a rotor fixing part 16 that holds the rotor 100 on the mounting surface 12a and a coil fixing part 18 that holds the coil member 14.

[0016] like Figure 3 As shown, the rotor fixing part 16 has a circular recess 20 and a fixing pin 22 protruding from the center of the recess 20. The fixing pin 22 engages with the shaft center of the rotor 100, thereby fixing the rotor 100. Rotors 100 of various diameters can be housed in the recess 20. Alternatively, instead of the fixing pin 22 and the recess 20, the rotor fixing part 16 can be constructed from various components such as a clamping mechanism that can fix the rotor 100.

[0017] The coil fixing portion 18 has a plurality of slots 24 extending radially relative to the center of the rotor fixing portion 16. Each slot 24 has a width approximately the same as the thickness of the coil component 14 (described later), enabling it to hold and fix the coil component 14. The slots 24 extend radially along the rotor fixing portion 16. The slots 24 allow the fixing position of the coil component 14 in the radial direction to be freely changed. The number of slots 24 is not particularly limited, and can be, for example, an even number such as 4, 6, ... . The slots 24 are arranged at equal intervals in the circumferential direction.

[0018] like Figure 1 As shown, the coil component 14 has a generally rectangular plate shape. Figure 2 As shown, the coil component 14 includes a support plate 26 and a coil 28. The support plate 26 is a component formed of a non-magnetic material such as resin. The planar shape of the support plate 26 is approximately rectangular. As one of the sides of the support plate 26, the coil component 14 has an inner side portion 14a arranged facing the outer periphery of the rotor 100. The inner side portion 14a has a dimension that is equal to or larger than that of the rotor 100 in the axial direction.

[0019] The coil 28 is embedded and built into the interior of the support plate 26. The coil 28 is wound around the coil centerline 26a that passes through the center of the support plate 26 and extends in the thickness direction.

[0020] The coil 28 has a rectangular shape. The coil 28 is wound in a rectangular shape around the outer periphery of the support plate 26. The arrangement pattern of the coil 28 is not limited to the example shown; it can also be a spiral shape or the like. The coil 28 has a straight portion 28c, which is embedded near the inner side portion 14a and extends parallel to the inner side portion 14a. The straight portion 28c has one or more wires extending in a straight line. The straight portion 28c is configured to be parallel to the axial direction of the rotor 100. The inner side portion 14a, where the straight portion 28c is embedded, is arranged on the outer periphery of the magnetic body 104 of the rotor 100 in a manner facing the rotor 100. The length of the straight portion 28c can be equal to or longer than the length of the rotor 100 in the axial direction.

[0021] When current flows through this coil 28, a concentric magnetic field is generated on each side of the coil 28 relative to the direction of the current according to the right-hand rule. Therefore, the straight portion 28c of the coil 28 generates a concentric magnetic field on the inner side portion 14a of the coil component 14. In this embodiment, the concentric magnetic field appearing on the inner side portion 14a is used for magnetizing the magnetic body 104. Current is supplied to the coil 28 through terminal portions 28a at one end and the other end. The terminal portions 28a protrude from the side of the outer periphery of the support plate 26. Wiring (not shown) is connected to the terminal portions 28a.

[0022] like Figure 1 As shown, the coil component 14 has a larger dimension in the axial direction than the rotor 100 in the axial direction. Therefore, a uniform magnetic field can be generated covering the axial direction of the rotor 100. Furthermore, the dimension of the coil component 14 in the radial direction is not particularly limited. The planar shape of the coil component 14 in the radial direction is suitably set within a range sufficient to generate a magnetic field for magnetization. The thickness of the coil component 14 is such that it can fit into the slot 24.

[0023] The coil components 14 are configured to have the same number of poles (number of magnetic bodies 104) as the rotor 100, or more. For example... Figure 1 As shown, two coil components 14 can also be used for one magnetic body 104. In this embodiment, since the magnetic field on the side of the coil 28 is used, the magnetic field tends to become weaker than in the prior art. It is preferable to use multiple coil components 14 for one magnetic body 104 to compensate for the weak magnetic field of a single coil 28.

[0024] The magnetizing device 10 can adapt to changes in the number of poles of the rotor 100 by increasing or decreasing the number of coil components 14 installed in the multiple slots 24. The coil components 14 are arranged around the rotor 100 with their central magnetic field aligned with the circumferential direction of the rotor 100. The wiring of adjacent coil components 14 is connected to generate magnetic fields with opposite directions. Figure 1 In the example shown, a pair of coil components 14 are arranged adjacent to each other on the outer periphery of a magnetic body 104. The gap 30 between the adjacent coil components 14 is approximately aligned with the circumferential position of the magnetic body 104.

[0025] The magnetizing device 10 of this embodiment is configured as described above. The magnetization method of this embodiment using the magnetizing device 10 is performed through the following steps.

[0026] The magnetization method of this embodiment includes a coil arrangement step, a rotor fixing step, and a magnetization step. The coil arrangement step involves arranging a plurality of coil components 14 on the holding member 12. Specifically, the coil arrangement step includes a coil number selection step and a coil fixing step. The coil number selection step is used to prepare a number of coil components 14 that is the same as or greater than the number of poles (the number of magnetic bodies 104 in the circumferential direction) of the rotor 100 to be magnetized. For example, in the case of magnetizing an 8-pole rotor 100, such as... Figure 4 As shown, prepare 8 or 16 coil components 14.

[0027] Following this, the coil components 14 are fixed. The coil components 14 are fixed by fitting a predetermined number of coil components 14 into the slots 24. The coil components 14 are mounted in the slots 24, which are arranged at equal intervals along the circumference. Additionally, as... Figure 4 As shown, the coil component 14 is adjusted radially with its inner circumferential end located near the outer circumference of the rotor 100. The slot 24 allows the coil component 14 to slide, thus facilitating radial positioning of the coil component 14. Accordingly, the coil configuration process is completed.

[0028] According to the coil configuration process, the straight portion 28c of the coil 28 is arranged near the magnetic body 104 in a direction aligned with the axis of the rotor 100. In the coil 28, the straight portion 28c is arranged such that it is closest to the magnetic body 104. Therefore, in the coil 28, the direction of the current flowing in the portion adjacent to the magnetic body 104 is parallel to the axis of the rotor 100.

[0029] Next, the rotor fixing process is performed. The rotor fixing process is the process of fixing the rotor 100 to the rotor fixing part 16 at the center of the holding member 12 where the coil members 14 are located. In the rotor fixing process, the rotor 100 is positioned in the circumferential direction. The rotor 100 is positioned such that the circumferential position of its magnetic body 104 coincides with the circumferential position of the gap 30 between the coil members 14. Accordingly, two coil members 14 are arranged adjacent to each magnetic body 104.

[0030] Following this, a magnetization process is performed. In the magnetization process, current is supplied to multiple coil components 14. For example... Figure 4 As shown, in this embodiment, current is supplied to the coil components 14 to generate magnetic fields with opposite directions between adjacent coil components 14. When this current is supplied, a concentric magnetic field is generated around the coil 28 of the coil component 14 according to the right-hand rule. Through the concentric magnetic fields from the two adjacent coil components 14, a magnetic field toward the radially inward or radially outward is applied to the magnetic bodies 104 adjacent to each other inside the gap 30. Through this magnetic field, the magnetic bodies 104 are magnetized radially inward or radially outward. The magnetization process magnetizes the magnetic bodies 104 so that magnetic bodies 104 magnetized as N poles on the radially outward side and magnetic bodies 104 magnetized as S poles on the radially outward side alternate in the circumferential direction.

[0031] After this, the rotor 100 is removed from the holding member 12, and the magnetization method for one rotor 100 is completed. In addition, the rotor fixing process and the magnetization process are repeated until the desired number of rotors 100 are magnetized.

[0032] Furthermore, when magnetizing rotors 100 with different diameters and / or pole numbers using the magnetizing device 10, the number and position of the coil components 14 are adjusted through a coil arrangement process. Therefore, the magnetizing device 10 and magnetizing method of this embodiment can magnetize various rotors 100, thereby reducing equipment waste.

[0033] Furthermore, the magnetization device 10 of this embodiment can also magnetize the magnetic body 104 in the circumferential direction by adjusting the arrangement relationship between the coil component 14 and the magnetic body 104. Therefore, by using the magnetization device 10 and by arranging the coil component 14 in a suitable manner, a permanent magnet group of a Heilbeck array can also be formed in the rotor 100.

[0034] This implementation method is summarized as follows.

[0035] One type of magnetization device 10 includes a holding member 12, a coil member 14, and a coil fixing part 18, wherein the holding member 12 is used to hold a rotor 100 having a magnetic body 104; the coil member 14 has a thin plate-shaped support plate 26 and a coil 28 built into the support plate and wound along the plane of the support plate; the coil fixing part 18 configures and fixes the coil member to the outer periphery of the rotor in such a way that the direction of the current of the portion of the coil closest to the magnetic body is aligned with the axial direction of the rotor, the coil member generates a concentric magnetic field around the coil according to the right-hand rule, and magnetizes the magnetic body through the concentric magnetic field.

[0036] The magnetizing device described above can easily accommodate changes in the number of rotor poles by adding or removing coil components from the coil fixing part. Furthermore, the magnetizing device can more easily adjust the position of the coil components to accommodate changes in the rotor diameter by adjusting the arrangement of the coil components towards the coil fixing part. Therefore, the magnetizing device can flexibly handle rotors with various diameters and numbers of poles, thus reducing equipment waste.

[0037] In the aforementioned magnetizing device, the coil can also be rectangular, having a straight portion 28c extending along the axial direction of the rotor. This magnetizing device can magnetize a magnetic material by using a magnetic field generated around the straight portion. This magnetizing device increases the freedom of arrangement of the coil components, allowing for flexible handling of rotors with various diameters and pole numbers.

[0038] In the magnetization device described above, the support plate may have an inner side portion 14a facing the rotor, and the straight portion of the coil may be arranged parallel to the inner side portion near the inner side portion. This magnetization device allows for flexible handling of various rotors by arranging a desired number of inner sides of the support plates facing the rotor.

[0039] In the magnetizing device described above, the coil fixing part may arrange multiple support plates radially. This magnetizing device can efficiently arrange support plates with their inner edges facing the rotor around the rotor.

[0040] In the magnetizing device described above, the coil fixing part can also hold the coil component in a manner that allows adjustment of the radial position of the coil component relative to the rotor. This magnetizing device can easily accommodate changes in the rotor diameter.

[0041] In the magnetizing device described above, the coil fixing part may have a plurality of slots 24 extending radially relative to the center of the rotor for holding the coil component. This magnetizing device allows the coil component to be easily adjusted radially according to the diameter of the rotor by sliding it along the slots.

[0042] In the magnetization device described above, the coil component can also be fixed to the holding component with the center line of the coil pointing circumferentially toward the rotor. This magnetization device can magnetize the magnetic body radially by generating a magnetic field around the coil component.

[0043] In the magnetizing device described above, the dimension of the straight portion of the coil component in the axial direction may be larger than the dimension of the magnetic body of the rotor in the axial direction. This magnetizing device can generate a uniform magnetic field for magnetization in the axial direction.

[0044] In the magnetization device described above, the number of coil components may be the same as or greater than the number of magnetic materials contained in the rotor. This magnetization device can reliably magnetize magnetic materials by generating magnetic fields through multiple coil components.

[0045] In the aforementioned magnetization device, two coil components can be arranged circumferentially adjacent to one of the magnetic bodies, and the magnetic body is magnetized by the concentric magnetic fields of the two coil components. This magnetization device reliably magnetizes a magnetic body by applying the magnetic fields of the two coil components to it.

[0046] In the aforementioned magnetization device, the coil component may be positioned circumferentially at the boundary of a plurality of magnetic bodies on the rotor that are to be magnetized. This magnetization device enables the magnetic bodies of the rotor to be magnetized radially.

[0047] In the aforementioned magnetization device, the position of the gap 30 between adjacent coil components in the circumferential direction may coincide with the position of the magnetic body in the circumferential direction. This magnetization device is capable of magnetizing the rotor's magnetic body in the radial direction.

[0048] In the magnetization device described above, the same number of coil components as the number of magnetic objects to be magnetized that are fixed to the rotor can be fixed to the coil fixing part. This magnetization device can magnetize all magnetic objects in a single magnetization process, thus offering excellent productivity.

[0049] In the magnetization device described above, the coil fixing part may have more slots than the number of magnetic bodies. This magnetization device, by having empty slots, can accommodate rotors with a larger number of poles by adding coil components.

[0050] Another approach is a magnetization method comprising a coil configuration step and a magnetization step. In the coil configuration step, a coil component is configured on the outer periphery of a rotor having a magnetic body. The coil component has a thin plate-shaped support plate and a coil wound inside the support plate and along the plane of the support plate. In the magnetization step, a current is supplied to the coil component to magnetize the magnetic body. The coil configuration step arranges and fixes the coil component in such a way that the direction of the current in the portion of the coil closest to the magnetic body is aligned with the axial direction of the rotor. The magnetization step generates a concentric magnetic field around the coil according to the right-hand rule, and magnetizes the magnetic body through the concentric magnetic field.

[0051] The magnetization method described above can flexibly handle rotors with various diameters and pole numbers, thus reducing equipment waste.

[0052] In the magnetization method described above, the coil may be wound into a rectangle, with a straight portion extending along the axis of the rotor in the part closest to the magnetic body.

[0053] In the magnetization method described above, the number of coil components can be configured to be greater than the number of magnetic bodies included in the rotor during the coil configuration process. This magnetization method can reliably magnetize the magnetic bodies.

[0054] Furthermore, the present invention is not limited to the embodiments described above, and various structures can be adopted without departing from the spirit of the present invention.

Claims

1. A magnetization device, characterized in that, It has a retaining component, a coil component, and a coil fixing part, wherein, The retaining component is used to retain a rotor having a magnetic body; The coil component has a thin plate-shaped support plate and a coil built into the inside of the support plate and wound along the plane of the support plate; The coil fixing part has multiple slots for holding the coil component, the slots extending radially relative to the center of the rotor. The coil fixing part holds the coil component in a manner that allows adjustment of the radial position of the coil component relative to the rotor, and configures and fixes the coil component to the outer periphery of the rotor in such a way that the direction of the current in the portion of the coil closest to the magnet is aligned with the axial direction of the rotor. The coil component generates a concentric magnetic field around the coil according to the right-hand rule, and magnetizes the magnetic body through the concentric magnetic field.

2. The magnetizing device according to claim 1, characterized in that, The coil is rectangular and has a straight portion extending along the axial direction of the rotor.

3. The magnetizing device according to claim 2, characterized in that, The support plate has an inner side portion that faces the rotor, and the straight portion of the coil is arranged parallel to the inner side portion near the inner side portion.

4. The magnetizing device according to claim 2, characterized in that, The straight portion of the coil component is larger in the axial direction than the magnetic body of the rotor.

5. The magnetizing device according to claim 1, characterized in that, The number of coil components is the same as or greater than the number of magnetic bodies contained in the rotor.

6. The magnetizing device according to claim 5, characterized in that, Two coil components are arranged circumferentially adjacent to one of the magnetic bodies, and the magnetic body is magnetized by the concentric magnetic field of the two coil components.

7. The magnetizing device according to claim 5 or 6, characterized in that, The coil fixing part has more slots than the number of magnetic bodies.

8. A magnetization method, characterized in that, It has a coil configuration process and a magnetization process, among which, In the coil configuration process, a coil component is configured on the outer periphery of a rotor having a magnetic body in a coil fixing part. The coil component has a thin plate-shaped support plate and a coil wound inside the support plate and along the plane of the support plate. The coil fixing part has a plurality of slots for holding the coil component. The slots extend radially relative to the center of the rotor. The coil fixing part holds the coil component in a manner that allows adjustment of the radial position of the coil component relative to the rotor. In the magnetization process, the magnetic material is magnetized by supplying current to the coil component. The coil configuration process involves aligning and fixing the coil components such that the direction of the current in the portion of the coil closest to the magnet is aligned with the axial direction of the rotor. The magnetization process generates a concentric magnetic field around the coil according to the right-hand rule, and the magnetic body is magnetized by the concentric magnetic field.

9. The magnetization method according to claim 8, characterized in that, The coil is wound into a rectangle, and has a straight portion extending along the axis of the rotor in the part closest to the magnet.

10. The magnetization method according to claim 8 or 9, characterized in that, In the coil configuration process, the number of coil components is configured to be greater than the number of magnetic bodies contained in the rotor.

Images