Magnetizing device

Abstract

The present invention provides a magnetization device that suppresses the occurrence of cracks in the resin sealing the coil and improves the effect and efficiency of magnetization. [Solution] A magnetization device for magnetizing magnets arranged on the rotor of a motor, comprising: a core surrounding the rotor; a coil for supplying a magnetic field to magnetize the rotor's magnets; a slot portion formed on the inner circumference side of the core, having an opening for housing the coil; a resin for sealing the coil housed in the slot portion; and a sealing member provided to close the opening so that the resin is not exposed on the inner circumference side.

Description

Technical Field

[0001] The present invention relates to a magnetization device for magnetizing magnets arranged on a rotor of a motor.

Background Art

[0002] When manufacturing a brushless motor in which magnets are arranged on a rotor of a motor, a magnetization device for magnetizing the magnets arranged on the rotor has been proposed (see, for example, Patent Document 1 and Patent Document 2).

[0003] The magnetization device described in Patent Document 1 winds a magnetization coil around a tooth portion protruding from a yoke body to magnetize the magnets of the rotor.

[0004] The magnetization device described in Patent Document 2 inserts a magnetization coil into a slot portion which is a hole provided in a core member.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the magnetization device described in Patent Document 1 and the magnetization device described in Patent Document 2, since the magnetization coil is separated from the outer periphery of the rotor by a certain distance, the magnetization effect and efficiency are reduced by that distance.

[0007] Therefore, in order to arrange the magnetization coil at a position as close as possible to the inner periphery of the core member, it is conceivable to configure the slot portion to have an opening on the inner peripheral side of the core member. When this configuration is adopted, the magnetizing coil housed in the slot is sealed by solidifying it with resin, similar to the magnetizing device described in Patent Document 2.

[0008] However, if this slot portion is configured to have an opening on the inner circumference side of the core member, the thickness of the resin between the magnetizing coil and the inner circumference of the magnetizing device becomes thinner. Therefore, when a large current is passed through the magnetization coil using a high voltage for magnetization, the resin may crack due to vibration of the magnetization coil or heat generated by the current.

[0009] To solve the above-mentioned problems, the present invention provides a magnetization device that can suppress the occurrence of cracks in the resin sealing the coil and improve the effect and efficiency of magnetization. [Means for solving the problem]

[0010] The magnetization device of the present invention is a magnetization device that magnetizes magnets placed on the rotor of a motor. Furthermore, the magnetization device of the present invention comprises a core surrounding the rotor, a coil for supplying a magnetic field to magnetize the rotor's magnet, a slot portion formed on the inner circumference side of the core having an opening for housing the coil, a resin for sealing the coil housed in the slot portion, and a sealing member provided to close the opening so that the resin is not exposed on the inner circumference side. [Effects of the Invention]

[0011] According to the magnetization device of the present invention described above, the coil housed in the slot is sealed with resin, and a sealing member is provided to close the opening on the inner circumference side of the slot so that the resin is not exposed to the inner circumference side. This suppresses the occurrence of cracks in the resin sealing the coil and improves the effect and efficiency of magnetization. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic diagram of a magnetization device according to one embodiment of the present invention. [Figure 2]It is a plan view of the core member of the magnetization device in FIG. 1. [Figure 3] It is a diagram showing the laminated structure of the magnetization device in FIG. 1. [Figure 4] It is a diagram showing the laminated structure of the magnetization device in FIG. 1. [Figure 5] It is an enlarged plan view of a part of the core member in FIG. 2. [Figure 6] It is a schematic configuration diagram of the coil of the magnetization device in FIG. 1. [Figure 7] It is an enlarged view of a part of the coil in FIG. 6. [Figure 8] A, B It is a schematic configuration diagram of the sealing plate of the magnetization device in FIG. 8. [Figure 9] It is an enlarged view of a part of the magnetization device in FIG. 1.

Mode for Carrying Out the Invention

[0013] First, prior to the description of the specific embodiments of the present invention, the outline of the present invention will be described.

[0014] The magnetization device of the present invention is a magnetization device for magnetizing a magnet disposed on a rotor of a motor. And, the magnetization device of the present invention includes a core surrounding the rotor, a coil for supplying a magnetic field for magnetizing the magnet of the rotor, a slot portion formed on the inner peripheral side of the core and having an opening for accommodating the coil, a resin for sealing the coil accommodated in the slot portion, and a sealing member provided so as to close the opening so that the resin does not expose on the inner peripheral side.

[0015] In the magnetization device of the present invention, the core is disposed outside the rotor and magnetizes the magnet of the rotor from the outside. For this purpose, the core is configured to surround the rotor, such as in a cylindrical shape. As the material of the core, a soft magnetic material can be used. Further, the core can be configured by a cylindrical块状 core or a laminated core in which a large number (a plurality) of plate-like core members are laminated. And, a slot portion having an open inner peripheral side is formed in the core.

[0016] In the magnetization device of the present invention, the coil supplies a magnetic field for magnetizing the magnet of the rotor and is configured by winding an electric wire. As the electric wire constituting the coil, a wire material with high conductivity such as a copper wire is used. The coil is housed in a slot portion formed in the core. Then, the coil housed in the slot portion is sealed with resin.

[0017] Further, when the cross-sectional shape of the electric wire constituting the coil is made substantially square, the electric wire can be wound in a closely contacting state as compared with an electric wire having a substantially circular cross-sectional shape. Thereby, the entire electric wire of the coil can be brought closer to the rotor side, and the magnetic field supplied to the rotor can be strengthened.

[0018] In the magnetization device of the present invention, the sealing member closes the opening on the inner peripheral side of the slot portion so that the resin for sealing the coil does not expose on the inner peripheral side.

[0019] When the sealing member is formed of a non-magnetic metal such as stainless steel, the heat resistance of the sealing member is good. Note that the sealing member is fixed to the core. In order to give the sealing member resistance to vibration and heat generation when an electric current flows through the coil, instead of adhesion with an adhesive, it is desirable to fix the sealing member to the core by fitting it into a recess provided in the core.

[0020] According to the magnetization device of the present invention, a sealing member is provided that closes the opening on the inner peripheral side of the slot portion so that the resin sealing the coil housed in the slot portion does not expose on the inner peripheral side. Thereby, the occurrence of cracks in the resin for sealing the coil can be suppressed, and the magnetization effect and efficiency can be improved.

[0021] Next, a specific embodiment of the present invention will be described.

[0022] FIG. 1 shows a schematic configuration diagram of a magnetization device according to an embodiment of the present invention. Figure 1 shows a plan view of the core member 10 that constitutes the magnetization device 1, with the coil 5 and sealing plate 16 attached. Furthermore, Figure 2 shows a plan view of the core member 10 of the magnetization device 1 shown in Figure 1, Figures 3 and 4 show the laminated structure of the magnetization device 1, Figure 5 shows an enlarged view of a part of the core member 10, and Figure 6 shows a schematic configuration diagram of the coil 5 of the magnetization device 1.

[0023] As shown in Figures 1 and 2, the core member 10 constituting the magnetization device 1 has a substantially concentric planar shape. The rotor to be magnetized by the magnetization device 1 is inserted into the space inside the inner circumference of the core member 10. Bolt holes 11 are formed at a position midway between the inner and outer circumferences of the core member 10. The core member 10 is formed from a soft magnetic material, such as a plate-shaped electromagnetic steel sheet (silicon steel, etc.).

[0024] Then, as shown in Figures 3 and 4, a large number of flat core members 10 are stacked, and the stacked core is sandwiched between the upper member 20 and the lower member 30 and fixed with bolts 2 and 3 to form a cylindrical core. Figure 3 shows a cross-sectional view of the stacked core in the portion that does not include the bolt holes 11. Figure 4 shows a cross-sectional view of the stacked core in the portion that includes the bolt holes 11. As shown in Figure 4, bolts 2 and 3 are inserted into the spaces 4 formed by the bolt holes 11 of each core member 10. Note that the bolt holes 11 of each core member 10 have threads (not shown) formed in them for fastening bolts 2 and 3.

[0025] The rotor to be magnetized by the magnetization device 1 is positioned inside the inner circumference of the core of the cylindrical magnetization device 1.

[0026] Furthermore, as shown in the enlarged view of Figure 5, recesses 12 and 13 are formed on the inner circumference of the core member 10. Recess 12 has a shape like a rectangle with curved sides. Recess 13 has a shape like two sides of a triangle. The recess 12 forms a slot portion 14 for housing a coil in the space inside the recess 12. In contrast to the configuration of the slot portion in Patent Document 2, which had a closed inner circumference, the magnetization device 1 of this embodiment has an open inner circumference on the slot portion 14. The tip portion 16B of the sealing plate 16, which will be described in detail later, is inserted into the recess 13.

[0027] Although not shown in the illustration, coil 5 is wound in a roughly rectangular planar shape. The schematic diagram in Figure 6 is a schematic view of coil 5, which is wound in a roughly rectangular planar shape, as seen from the shorter side of the rectangle. A magnified view of a part of Figure 6 is shown in Figure 7.

[0028] As shown in the schematic configuration diagram of Figure 6, coil 5 has a rectangular long side portion 5A that extends perpendicular to the plane of the paper in Figure 6, and a rectangular short side portion 5B that extends parallel to the plane of the paper in Figure 6. As shown in Figures 6 and 7, the coil 5 is made up of wires with a roughly square cross-section, and the wires are wound in two layers. Furthermore, as shown in Figure 6, the short side portion 5B of the coil 5 has a shape that is bent symmetrically around the center. Although not shown in Figures 6 and 7, wires extend from both ends of the wound coil 5 to supply current to the coil 5, and these wires are electrically connected to a power source that supplies the current.

[0029] As can be seen from Figures 1, 5, and 6, the long side portion 5A of the coil 5 is housed in the slot portion 14, and the short side portion 5B of the coil 5 is attached to the portion of the core member 10 between the slot portions 14 (the so-called teeth portion). In this way, the coil 5 is attached so as to wind around the teeth portion of the core member 10.

[0030] Furthermore, as can be seen from Figures 1 and 6, the short side portion 5B of the coil 5, which has a curved shape, is attached to the core member 10 such that the outer circumference of the core member 10 is convex. The coil attached to the core member 10 is then sealed by a resin (not shown) supplied into the space of the slot portion 14.

[0031] In the magnetization device 1 of this embodiment, the inner circumference is open, and a sealing plate 16 is provided on the inner circumference of the slot portion 14, which is sealed with resin, as a sealing member to close the opening of the slot portion 14. The sealing plate 16 is more preferably made of a non-magnetic material (for example, a non-magnetic metal such as stainless steel). By using a non-magnetic material for the sealing plate 16, the sealing plate 16 does not affect the magnetic field from the coil 5. In particular, by using a non-magnetic metal for the sealing plate 16, the sealing plate 16 is less likely to deteriorate due to the heat generated when the magnetization device 1 is in use.

[0032] Figures 8A and 8B show schematic diagrams of the sealing plate 16 of the magnetization device 1, and Figure 9 shows an enlarged view of a part of the magnetization device (the part near the sealing plate 16) in Figure 1. Figure 8A shows a side view of the sealing plate 16. Figure 8B shows a top view of the sealing plate 16. As shown in Figures 8A and 8B, the sealing plate 16 has a projection 16A near the center line of its planar shape, protruding to the right in Figure 8A, and sharply pointed tips 16B at its upper and lower ends in the figures. Furthermore, the main surface of the sealing plate 16 on the side where the projection 16A is formed is flat, while the main surface on the opposite side of the projection 16A is curved. As shown in Figures 1 and 9, the projection 16A of the sealing plate 16 is positioned on the outer circumference of the core member 10 and presses down on and secures the long side portion 5A of the coil 5 in the slot portion 14. The main surface of the sealing plate 16 opposite to the projection 16A is positioned on the inner circumference side of the core member 10 and faces the rotor. As shown in Figures 1 and 9, the tip portion 16B of the sealing plate 16 is fitted into the recess 13 of the core member 10. This fixes the sealing plate 16 to the inner circumference of the slot portion 14.

[0033] The thickness of the sealing plate 16 is selected to have sufficient strength to prevent damage from temperature changes during use of the magnetization device 1, and to be within a range where the rotor does not become too far from the coil 5, thereby reducing the magnetization effect and efficiency.

[0034] According to the configuration of the magnetization device 1 of this embodiment, the long side portion 5A of the coil 5 is housed in the space of the slot portion 14, which is formed by the recess 12 of the core member 10 and has an open inner circumference side of the core member 10. As a result, compared to the configurations of the magnetization devices described in Patent Documents 1 and 2, the coil 5 can be brought closer to the rotor, which is the object to be magnetized and is positioned inside the inner circumference of the magnetization device 1, thereby improving the effectiveness and efficiency of magnetizing the rotor.

[0035] Furthermore, according to the configuration of the magnetization device 1 of this embodiment, since a sealing plate 16 is provided on the inner circumference side of the slot portion 14, the sealing plate 16 can prevent cracking of the resin sealing the long side portion 5A of the coil 5 when current is passed through the magnetization device 1.

[0036] (modified version) In the magnetization device 1 of the above embodiment, a plate-shaped sealing plate 16 was used as a sealing member to close the opening of the slot portion 14. In the magnetization device of the present invention, the sealing member to close the opening of the slot portion is not limited to a plate-shaped sealing plate, and other shapes of sealing members can also be used. Furthermore, the material of the sealing component is not limited to non-magnetic metals; other non-magnetic materials or magnetic materials can also be used. However, when using magnetic materials, the material, dimensions, and shape must be selected to avoid problems with the strength and shape of the magnetic field supplied from the coil to the rotor magnet.

[0037] The cross-sectional shape of the wires constituting the coil is not limited to the substantially rectangular cross-sectional shape of the coil 5 of the magnetization device 1 in the above-described embodiment, but can also be other shapes (for example, substantially circular or substantially elliptical). Furthermore, using a wire with a roughly square cross-sectional shape, such as the coil 5 of the magnetization device 1 in the above embodiment, allows the wires to be wound more tightly together compared to a wire with a roughly circular cross-sectional shape. This has advantages such as bringing the entire coil wire closer to the rotor and strengthening the magnetic field supplied to the rotor.

[0038] Furthermore, in the magnetization device 1 of the above-described embodiment, a laminated core was formed by stacking many (multiple) flat core members 10. However, the magnetization device of the present invention can also employ other configurations (for example, a single cylindrical core). As with the magnetization device 1 of the above embodiment, when a configuration is used in which a large number of flat core members are stacked, the advantage is that recesses for forming slots and recesses for inserting the tip of a sealing plate can be easily formed because each core member is thin.

[0039] It should be noted that the present invention is not limited to the embodiments and modifications described above, but includes various modifications. For example, the embodiments and modifications described above are explained in detail for the purpose of clearly illustrating the present invention, and are not necessarily limited to those having all the configurations described. [Explanation of Symbols]

[0040] 1 Magnetizing device, 2,3 Bolts, 5 Coil, 10 Core member, 11 Bolt hole, 12,13 Recess, 14 Slot section, 16 Sealing plate, 20 Upper member, 30 Lower member

Claims

1. A magnetizing device for magnetizing magnets placed on the rotor of a motor, A core surrounding the rotor, A coil for supplying a magnetic field to magnetize the magnet of the rotor, A slot portion formed on the inner circumference of the core, having an opening for housing the coil, A resin that seals the coil housed in the slot portion, A sealing member is provided to close the opening so that the resin is not exposed on the inner circumference, Equipped with Magnetizing device.

2. The magnetization device according to claim 1, wherein the sealing member is formed of a non-magnetic material.

3. The magnetization device according to claim 1, wherein the sealing member is formed of a non-magnetic metal.

4. The magnetization device according to claim 1, wherein the sealing member is plate-shaped and has a curved surface formed on the side facing the rotor.

5. The magnetization device according to claim 1, wherein the sealing member has a projection formed on the side facing the coil.

6. The magnetization device according to claim 1, wherein the core has a recess for fitting the sealing member.

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