KR20170087797A - Protection Method for the Magnet of Rotor Assembly - Google Patents

Protection Method for the Magnet of Rotor Assembly Download PDF

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Publication number
KR20170087797A
KR20170087797A KR1020160007827A KR20160007827A KR20170087797A KR 20170087797 A KR20170087797 A KR 20170087797A KR 1020160007827 A KR1020160007827 A KR 1020160007827A KR 20160007827 A KR20160007827 A KR 20160007827A KR 20170087797 A KR20170087797 A KR 20170087797A
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KR
South Korea
Prior art keywords
magnet
segments
pair
epoxy
excitation coil
Prior art date
Application number
KR1020160007827A
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Korean (ko)
Inventor
김병길
이우성
진진
Original Assignee
이래오토모티브시스템 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 이래오토모티브시스템 주식회사 filed Critical 이래오토모티브시스템 주식회사
Priority to KR1020160007827A priority Critical patent/KR20170087797A/en
Publication of KR20170087797A publication Critical patent/KR20170087797A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

The present invention relates to a method for protecting a magnet of a rotor assembly, and more particularly, to a method for protecting a magnet from oxidation and deterioration by providing a magnet including a rare earth component and applying an epoxy to a segment into which the magnet is inserted.
According to an embodiment of the present invention, A ring-shaped excitation coil disposed on the rotor rotation shaft; A pair of segments in which a pole piece of a tooth structure is formed to surround the excitation coil; And a plurality of magnets for preventing saturation of a magnetic flux formed around the excitation coil, the method comprising the steps of: (a) sintering a rare earth magnet raw material to form the magnet; (b) providing the rotor rotation axis, the excitation coil, and the pair of segments; (c) machining the guide groove of the magnet in the pair of segments; (d) applying an epoxy to each of the pair of segments formed with the guide grooves; (e) axially aligning the pair of segments to which the rotor rotation axis, the excitation coil and the epoxy are applied; And (f) press-fitting the magnet into a pair of epoxy-coated segments, thereby providing a magnet protection method for a rotor assembly.

Description

[0001] The present invention relates to a protection method for a rotor assembly,

The present invention relates to a method for protecting a magnet of a rotor assembly, and more particularly, to a method for protecting a magnet from oxidation and deterioration by providing a magnet including a rare earth component and applying an epoxy to a segment into which the magnet is inserted.

2. Description of the Related Art In general, a vehicle is equipped with various electric and electronic devices that are operated by electric power supplied from a generator and a battery, and a charging device is provided with a generator as a center for stable supply of electric power to be supplied to the electric and electronic devices. Although a direct current generator and an alternator are used as generators, an alternator that maintains stability at low speed and high speed is widely used.

As the automotive alternator, a three-phase alternator generally called an alternator is used in order to increase the generated voltage at low speed and to exhibit stable performance at high speed. The three-phase alternator is connected to the crankshaft of an automobile engine, receives power during engine rotation, performs power generation, and charges the battery.

1 is a cross-sectional view schematically showing a general automotive alternator.

As shown in FIG. 1, the automotive alternator includes a rotor assembly 110 rotatably disposed in the center of the housing 100 to generate a magnetomotive force, A stator assembly 120 for generating an induced electromotive force by a generated magnetism and disposed in the form of surrounding the rotor assembly 110 along the inner circumferential surface of the housing 100, A rectifier 140 for rectifying the generated alternating current to a direct current, a pulley 160 connected to the crankshaft of the engine via a belt, for receiving power from the engine, and the like .

More specifically, the stator assembly 120 includes a drive end frame (DE) (not shown) and a slip ring end frame (SRE) (Not shown), and the rotor assembly 110 is positioned inside the stator assembly 120.

The rotor shaft of the rotor assembly 110 is wound around an excitation coil to connect the slider to a slip ring (not shown) A spool bobbin (not shown) is coupled.

A plurality of pole-shaped segments having claw poles are located outside the spool bobbin (not shown), and the battery power is conducted through the slip ring to magnetize the segments.

The segment may have a shape having an upward light-narrowing shape and may serve as a housing for protecting the excitation coil and a magnetic body. A plurality of magnets may be selectively coupled between the segments to prevent saturation of the magnetic flux formed around the exciting coil.

However, since the magnet according to the related art is generally assembled so as to have a brittle property and a minimum tolerance so as not to fall into the operation of the rotor rotating at high speed, the magnet is worn or extreme in the process of fitting the magnet into the segment A cracking phenomenon occurs.

Particularly, in the case of a magnet including a rare-earth component, the above-described phenomenon may lead to more fatal consequences and may seriously affect the magnetic field of the rotor assembly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a specific method for protecting oxidation and deterioration of a magnet by applying epoxy to a segment into which a magnet is inserted.

Another object of the present invention is to provide a method of protecting a magnet of a rotor assembly applicable to various transmission mechanisms including an alternator.

According to an embodiment of the present invention, A ring-shaped excitation coil disposed on the rotor rotation shaft; A pair of segments in which a pole piece of a tooth structure is formed to surround the excitation coil; And a plurality of magnets for preventing saturation of a magnetic flux formed around the excitation coil, the method comprising the steps of: (a) sintering a rare earth magnet raw material to form the magnet; (b) providing the rotor rotation axis, the excitation coil, and the pair of segments; (c) machining the guide groove of the magnet in the pair of segments; (d) applying an epoxy to each of the pair of segments formed with the guide grooves; (e) axially aligning the pair of segments to which the rotor rotation axis, the excitation coil and the epoxy are applied; And (f) press-fitting the magnet into a pair of epoxy-coated segments, thereby providing a magnet protection method for a rotor assembly.

According to an embodiment of the present invention, the magnet of the step (a) may be characterized in that the surface of the magnet is electroless-coated.

According to one embodiment, the epoxy application in the step (d) may be performed by applying a portion of the pole piece including the guide groove region to the prepared epoxy container.

According to one embodiment, the epoxy application in the step (d) may apply a portion of the pole piece including the guide groove region by a spraying method.

According to an embodiment, the step (d) may include heat treating the epoxy-coated segment.

According to an embodiment, the method may further include magnetizing the magnet before the step (e).

According to an embodiment, the guide groove of the step (c) may be formed asymmetrically with reference to the heightwise center line of the pole piece.

According to an embodiment of the present invention, a step of providing a spacer for protecting the magnet before the step (f), and fastening the spacer to the magnet may be included.

In the present invention, the epoxy is applied to the guide groove formed in the segment to reduce the damage of the magnet which may occur at the time of inserting the magnet, thereby improving the wear resistance and durability.

1 is a cross-sectional view schematically showing a general automotive alternator.
2 is a side view of a rotor assembly in which a magnet is coupled to a segment according to an embodiment of the present invention.
3 is a block diagram of a magnet protection method of a rotor assembly according to an embodiment of the present invention.
4 is a view showing a guide groove formed in a segment according to an embodiment of the present invention.
5 is a conceptual diagram showing the application of epoxy to a segment according to an embodiment of the present invention.
Fig. 6 is a conceptual diagram showing a spacer bonded to the magnet of the present invention. Fig.
7 is a block diagram of a magnet protection method of a rotor assembly according to another embodiment of the present invention.

The embodiments described below are provided so that those skilled in the art can easily understand the technical idea of the present invention, and thus the present invention is not limited thereto. In addition, the matters described in the attached drawings may be different from those actually implemented by the schematic drawings to easily describe the embodiments of the present invention.

It is to be understood that when an element is referred to as being connected or connected to another element, it may be directly connected or connected to the other element, but it should be understood that there may be other elements in between.

The term "connection" as used herein means a direct connection or an indirect connection between a member and another member, and may refer to all physical connections and electrical connections such as adhesion, attachment, fastening, bonding, and coupling.

Also, the expressions such as 'first, second', etc. are used only to distinguish a plurality of configurations, and do not limit the order or other features between configurations.

The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The word "comprise" or "having" is used herein to mean that a feature, a number, a step, an operation, an element, a component or a combination thereof is included in the description, A step, an operation, an element, a part, or a combination thereof.

Prior to the description of the drawings, the same constituent elements as in the prior art will be described using the same reference numerals.

It should be noted that the rotor assembly of the present invention is described as an example of an object, but it can be applied to various motors other than the alternator within the scope of the present invention.

First, the rotor assembly of the present invention will be briefly described with reference to FIG. 2 is a side view of a rotor assembly in which a magnet is coupled to a segment according to an embodiment of the present invention.

A rotor assembly according to an embodiment of the present invention includes a rotor rotating shaft; A ring-shaped excitation coil disposed on the rotor rotation shaft; A pair of segments in which a pole piece of a tooth structure is formed to surround the excitation coil; And a plurality of magnets for preventing saturation of the magnetic flux formed around the excitation coil. The construction of such a rotor assembly has been described above in the Background Art, so a detailed description will be omitted.

3 is a block diagram of a method of protecting a magnet of a rotor assembly of the present invention.

Referring to FIG. 3, the present invention provides a method of manufacturing a magnet, comprising the steps of: (a) preparing a magnet by sintering a magnet raw material containing rare earth (S610); (b) providing the rotor rotating shaft, the exciting coil and the pair of segments (S620); (c) machining the guide groove of the magnet in the pair of segments (S630); (d) applying epoxy to each of the pair of segments formed with the guide grooves (S640); (e) axially aligning (S650) a pair of segments to which the rotor rotation axis, the excitation coil and the epoxy are applied; And (f) press-fitting the magnet into a pair of segments coated with epoxy (S660).

First, with reference to step (a), it is assumed that the magnet of the present invention is sintered with a rare earth-containing magnet raw material. Here, the rare earth elements (Rare Earth Elements) are composed of a total of 17 elements such as 15 lanthanide elements (Sc) 57, 71 scandium (Sc), and 21 scintium (Sc) . The reason for using rare earths is that they are very stable in steady state, have good heat conduction characteristics, and have excellent electrical and magnetic properties. In contrast to these advantages, relatively weak strength and abrasion resistance are complementary It should be noted that the epoxy coating method of the present invention has been devised. The specific manufacturing method of the rare-earth magnet is widely disclosed in the prior art, and a description thereof will be omitted.

Here, the magnet may be characterized in that the surface thereof is subjected to an electric coating treatment. Since the above-mentioned rare earth component tends to oxidize when exposed to air, it is coated to prevent this. Specifically, the surface of the magnet is degreased and cleaned by electrolysis to remove impurities, and the coating is immersed in an electrodeposition solution, and electricity is passed therethrough to apply a coating resin film. The corrosion resistance, heat resistance and electric insulation of the magnet can be enhanced.

the rotor rotation axis, the excitation coil and the pair of segments 112a and 112b may be made of steel or a copper alloy, respectively. In particular, the pair of segments 112a and 112b may be made of a relatively Is preferably made of a steel alloy having high magnetic properties.

The pair of segments 112a and 112b can be largely manufactured by selecting hot forging or cold forging. For example, according to the hot forging method, the above-mentioned material is used to form a starfish or claw-like sheet of iron sheet, and the desired tool is plastically deformed by heating the metal tool and bending the sheet. According to the cold forging method, a steel sheet is bent without heating the material, and then a desired segment is formed through a sizing and trimming process. In this method, the flatness of the product and the scale loss due to thermal deformation are measured. There is an advantage in that there is no. In the production of the segment of the present invention, the above-described embodiment can be selectively used as necessary.

Meanwhile, FIG. 4 is a view showing that a guide groove is formed in a segment according to an embodiment of the present invention.

Referring to FIG. 4, when the pair of segments 112a and 112b are provided, the guide groove 113 is formed.

In the step (c), as a main process for implementing the present invention, there is a risk of breakage when the magnet 114 is inserted at a small tolerance. On the contrary, if the tolerance is too large, there is a risk of wear of the magnet 114 due to vibration. Special attention should be paid to setting. As a processing method, for example, a method of milling a magnetic pole piece of a segment using a CNC (Computer Numerical Control) machine tool can be employed.

Although the specific shape of the guide groove 113 is not specified, in general, the edge is sharp by straight processing in order to reduce the process cost. As a result, scratches are generated in the magnet 114, and when the surface of the magnet 114 is coated, the coating material is damaged and rare earths are exposed to the air. In order to solve such a problem, the present invention includes a spacer for protecting the magnet 114, and a detailed description thereof will be described later.

5 is a conceptual diagram showing the application of epoxy to a segment according to an embodiment of the present invention.

(d) represents a step of applying epoxy to each of a pair of segments 112a and 112b having guide grooves 113 as a core process for implementing the present invention. The epoxy, which is mainly used as a protective coating, is evenly formed on the claw pole portion of the segment.

Here, the epoxy application may be performed by applying a portion of a claw pole including the area of the guide groove 113 to the prepared epoxy container, as shown in the drawing, or by spraying. However, it is preferable to immerse the provided pair of segments 112a and 112b in a liquid container of a considerable size rather than a spray-type liquid spraying method in terms of shortening the manufacturing process time and uniformly applying the epoxy.

After step (d), there may be included a step of heat treating the epoxy coated segments 112a and 112b according to an embodiment of the present invention. Epoxy is a kind of synthetic resin, which solidifies fast when applied in a liquid state and has a strong adhesive force, so that the epoxy hardens sufficiently through heat treatment.

After the epoxies are applied to the pair of segments 112a and 112b in steps (e) and (f), a pair of segments 112a and 112b coated with the rotor rotation axis, the excitation coil, . After the axial alignment, the magnet 114 is press-fitted into the pair of segments 112a and 112b coated with epoxy to assemble the rotor assembly as shown in FIG.

On the other hand, the magnet of the present invention may be made of a natural magnet such as magnetite magnet having magnetism from the beginning, but it may be magnetized by artificially magnetizing a weak magnetic metal. Or a case where the magnet having the first strong magnetism naturally weakens magnetism may occur. Therefore, the present invention may further include a step of magnetizing the magnet.

The spacer according to an embodiment of the present invention will now be described. Fig. 6 is a conceptual diagram showing a spacer bonded to the magnet of the present invention. Fig.

The spacer 115 is a member for protecting the magnet 114 as described above and may be formed of a fastening medium formed to enclose the side surface of the magnet 114 when the tolerance between the magnet 114 and the guide groove 113 is difficult to precisely match. Generally formed of aluminum or synthetic resin.

The spacer 115 has a function of securing durability not only against the scratch prevention function but also from considerable rotation moment generated as the rotor assembly rotates at several thousand to tens of thousands of rpm.

The shape of the spacer 115 is not limited, but a predetermined space in which the magnet 114 can be housed therein is formed and one surface is opened. The magnetic field of the magnet 114 is formed in the direction in which the one surface is opened, and the interference of the structure is small, so that the magnetization saturation phenomenon of the rotor can be improved more effectively.

7 is a block diagram of a magnet protection method of a rotor assembly according to another embodiment of the present invention.

According to the present embodiment, a step of preparing a magnet (S710); Providing a rotor rotation axis, an excitation coil and a pair of segments (S720); Machining a guide groove of the magnet in a pair of segments (S730); A step (S740) of applying an epoxy to each of the pair of segments formed with the guide grooves; Heat treating the epoxy coated segment (S750); Axis aligning a pair of segments to which the rotor rotation axis, the excitation coil and the epoxy are applied (S760); Providing a spacer for protecting the magnet, and fastening the magnet to the magnet (S770); And a step (S780) of press-fitting the magnet into a pair of segments to which the epoxy is applied.

As described above, in the present invention, the epoxy is applied to the guide groove formed in the segment to reduce the damage of the magnet which may occur at the time of inserting the magnet, thereby improving the wear resistance and durability.

The present specification is not intended to limit the present invention by the specific terms given. While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Modifications, alterations, and modifications can be made.

And each step described in the embodiment of the present invention is not limited in the order of operations for the implementation of the present method according to the order of the description.

The scope of the present invention is defined by the appended claims rather than the foregoing description, and all changes or modifications derived from the meaning and scope of the claims and equivalents thereof are deemed to be included in the scope of the present invention. .

100: AC generator housing
101: Inner housing
110: Rotor assembly
111:
112a, 112b: segment
113: Magnet guide groove
114: Magnet
115: Spacer
120: Stator assembly
130: Brush assembly
150: rectifier
160: pulley

Claims (8)

Rotor rotation axis; A ring-shaped excitation coil disposed on the rotor rotation shaft; A pair of segments in which a pole piece of a tooth structure is formed to surround the excitation coil; And a plurality of magnets for preventing saturation of a magnetic flux formed around the excitation coil, the method comprising the steps of:
(a) sintering a magnet raw material containing rare earths to prepare the magnet;
(b) providing the rotor rotation axis, the excitation coil, and the pair of segments;
(c) machining the guide groove of the magnet in the pair of segments;
(d) applying an epoxy to each of the pair of segments formed with the guide grooves;
(e) axially aligning the pair of segments to which the rotor rotation axis, the excitation coil and the epoxy are applied; And
(f) press-fitting the magnet into a pair of epoxy-coated segments. The method according to claim 1,
Wherein the magnet of the step (a) is electropolished. The method according to claim 1,
Wherein the applying of the epoxy in the step (d) is performed by applying a portion of the pole piece including the guide groove region to the prepared epoxy container. The method according to claim 1,
Wherein the applying of the epoxy in the step (d) comprises applying a part of the pole piece including the guide groove region by a spraying method. The method according to claim 1,
And (d) heat treating the epoxy-coated segment after the step (d). The method according to claim 1,
Further comprising the step of magnetizing the magnet before the step (e). The method according to claim 1,
Wherein the guide groove of the step (c) is asymmetrically formed with respect to a heightwise center line of the magnetic pole piece. The method according to claim 1,
And providing a spacer for protecting the magnet before the step (f), and fastening the spacer to the magnet.


KR1020160007827A 2016-01-21 2016-01-21 Protection Method for the Magnet of Rotor Assembly KR20170087797A (en)

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Application Number Priority Date Filing Date Title
KR1020160007827A KR20170087797A (en) 2016-01-21 2016-01-21 Protection Method for the Magnet of Rotor Assembly

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220068512A (en) 2020-11-19 2022-05-26 보그워너피디에스창녕 유한회사 Manufacturing method of roter with forged slot

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220068512A (en) 2020-11-19 2022-05-26 보그워너피디에스창녕 유한회사 Manufacturing method of roter with forged slot

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