KR102490607B1 - magnet insert type motor rotor - Google Patents

Abstract

The present invention is a magnet press-fitting motor rotor, which includes a rotor core made by laminating a plurality of magnetic steel plates and inserted into a rotating shaft of the motor, coupled to the inside of the rotor core, and corresponding to the number of poles in the circumferential direction of the rotor core. including magnets arranged at equal intervals along, wherein the magnetic steel plate penetrates from the center of the magnetic steel plate in a thickness direction of the magnetic steel plate, and includes a center hole to which the rotating shaft is coupled; a plurality of original core holes disposed spaced apart from the periphery of the center hole in a circumferential direction; a recess core hole spaced apart from the one core hole in a circumferential direction and having a first recess; and a protrusion core hole spaced apart from the recess core hole in the circumferential direction and having a protrusion in the second recess, wherein the magnetic steel sheet is rotated at intervals of 360 degrees/number of poles in sequence. When stacked, the one-core hole, the recess core hole, and the protrusion core hole coincide with each other, and the first recess is disposed under the protrusion, so that the magnet operates through the one-core hole, the recess core hole, and the protrusion core hole. When inserted through the protrusion core hole, the protrusion moves toward the first recess without interference and is deformed while fixing the magnet.

Description

Magnet insert type motor rotor}

The present invention relates to a magnet press-fit motor rotor, and more particularly, simplifies the assembly process between the motor rotor and the magnet and reduces manufacturing costs, while damaging the magnetic steel plate of the motor rotor or the magnet itself during magnet press-fit assembly. It relates to a magnet press-fitting motor rotor capable of preventing damage.

The background technology of the present invention is disclosed in Republic of Korea Publication No. 10-2005-0118518 (2005. 12. 19.).
In general, a motor transmits rotational force of a rotor, which is a rotor, to a rotational shaft, so that the rotational shaft drives a load. The rotor is a component that rotates by electromagnetic interaction with a stator, which is a stator.

The concentricity of the rotor is very important in the operation of the motor. This is because poor concentricity may increase noise and vibration during rotation of the rotor and decrease the efficiency of the motor. In addition, since the vibration of the rotor is transmitted to the rotating shaft as it is, noise and vibration may be further generated when the load is driven.

Such a rotor consists of a rotor core laminated with a plurality of magnetic steel plates, a magnet (eg, permanent magnet) installed in a core hole of the rotor core, and a rotation shaft coupled to the rotor core.

In particular, magnetic steel plates are laminated to minimize leakage of magnetic flux in the axial direction of the rotor core. Each magnetic steel plate is manufactured in plurality by cutting and forming an iron plate or steel plate through pressing, and becomes a rotor core through a lamination process.

In particular, in order for the rotor core to be manufactured for brushless DC (BLDC) motors, a plurality of magnets inside the circular rotor core are required in combination with a plurality of poles (e.g., 6 poles, 8 poles, 10 poles). prepared to respond.

In order to install the magnet according to the prior art to the inside of the rotor core, the cross-sectional area of the magnet is relatively smaller than that of the core hole.

Accordingly, the magnet may be inserted into the core hole by using the clearance or gap between the magnet and the core hole, but the magnet cannot be fixed to the core hole after being inserted.

At this time, in the prior art, a thermosetting adhesive or molding agent is applied or injected between the core hole and the magnet, and the bonding of the magnet is strengthened in a heating furnace.

However, the conventional magnet assembly method using an adhesive or molding agent is manual, and the distance between the magnets, which should be spaced equally, is not the same, and the thickness of the adhesive applied to the inner surface of the rotor is not constant. It is easy to cause deformation in the adhesive position of the magnet due to deformation.

In addition, the conventional magnet assembly method using an adhesive or molding agent increases the material cost by using an adhesive or molding agent, which is a chemical material, requires an additional process and requires a curing time, and the initial injection sample that is discarded when the adhesive or molding agent is injected , there is a problem that leads to an increase in cost in the event of a defect.

In addition, in other conventional techniques, attempts have been made to fix the core hole and the magnet to each other using a protrusion or a caulking method.

However, other conventional technologies have a problem in that the gap between the magnet and the core hole increases. For example, a gap between the magnet and the core hole must be at least 2 mm so that the protrusion directly contacting the magnet by the core or the caulking itself is bent to allow the magnet to be press-fitted. At this time, the thickness of the magnetic steel sheet may be 0.3t. That is, in other conventional technologies, since the gap between the core hole and the magnet is 2 mm or more, magnetic flux saturation in the rotor core is excessive, making it impossible to secure magnet performance.

In addition, other conventional technologies have a structure that cannot be mass-produced and mass-produced. That is, since a core having protrusions must be separately manufactured and protrusions must be formed at equal intervals during lamination, manufacturing is very difficult or it is very difficult to match the protrusion spacing, and a magnetic steel sheet with protrusions and a magnetic steel sheet without protrusions, that is, two types It has a disadvantage that automated mass production is impossible because it is necessary to assemble while matching the magnetic steel sheets of each type according to the upper and lower gaps of the protrusions.

The present invention has been proposed in view of the above situation, and the gap between the magnet and the core hole can be maintained smaller than the thickness of the magnetic steel sheet, while the magnet and the core hole can be fixed to each other without using a separate adhesive, To provide a magnet press-fitting motor rotor capable of preventing damage to the magnetic steel plate of the motor rotor or damage to the magnet itself during magnet press-fit assembly, while simplifying the assembly process of the motor rotor and magnet and reducing manufacturing costs .

A magnet press-fitting motor rotor according to an embodiment of the present invention is coupled to a rotor core made by laminating a plurality of magnetic steel plates and inserted into a rotating shaft of the motor, and coupled to the inside of the rotor core, corresponding to the number of poles. In the magnetic press-fit motor rotor including magnets disposed at equal intervals along the circumferential direction of the core, the magnetic steel plate penetrates from the center of the magnetic steel plate in the thickness direction of the magnetic steel plate, and the rotation shaft is coupled. a center hole to be; a plurality of original core holes disposed spaced apart from the periphery of the center hole in a circumferential direction; a recess core hole spaced apart from the one core hole in a circumferential direction and having a first recess; and a protrusion core hole spaced apart from the recess core hole in the circumferential direction and having a protrusion in the second recess, wherein the magnetic steel sheet is rotated at intervals of 360 degrees/number of poles in sequence. When stacked, the one-core hole, the recess core hole, and the protrusion core hole coincide with each other, and the first recess is disposed under the protrusion, so that the magnet operates through the one-core hole, the recess core hole, and the protrusion core hole. When inserted through the protrusion core hole, the protrusion moves toward the first recess without interference and is deformed while fixing the magnet.

Any one of the one core hole, the recess core hole, and the protruding core hole penetrates in the thickness direction of the magnetic steel sheet, and has a gap smaller than the thickness of the magnetic steel sheet after the magnet is inserted.

The recess core hole is spaced apart from the one core hole in the circumferential direction, penetrates in the thickness direction of the magnetic steel sheet, and is formed to enter the center hole direction from a hole side adjacent to the center hole. includes seth

The protruding core hole is spaced apart from the recess core hole along the circumferential direction, penetrates in the thickness direction of the magnetic steel sheet, and is formed to enter the center hole direction from a hole side adjacent to the center hole, and the second recess having the same width as the first recess, wherein the protrusion extends from a recess side of the second recess adjacent to the center hole in a direction opposite to the center hole to form the protrusion core. The hole protrudes further than the hole-side side.

The protrusion is smaller than the width of the second recess and is formed 1 to 3 times the thickness of the magnetic steel sheet.

The magnet press-fitting motor rotor according to the present invention can reduce the manufacturing cost of the magnetic steel plate by using one type of magnetic steel plate.

In the present invention, when one type of magnetic steel plate is sequentially laminated, the magnetic steel plate is rotated at intervals of 360 degrees/pole number to provide a stacked rotor core, so that a plurality of rotor cores are formed inside the core hole of the rotor core in the axial direction of the rotor core. Protrusions and recesses may be spaced apart from each other, and thus, the magnet may be coupled and fixed to the core hole by press fitting without using a separate adhesive or molding agent, and the magnet may be damaged or the protrusion of the magnetic core may be damaged. There is an advantage in that it is possible to manufacture a high-quality motor rotor by preventing

Since the gap between the magnet and the core hole is formed smaller than the thickness of the magnetic steel plate, the excessive magnetic flux saturation in the rotor core can be prevented in advance, and the magnet performance can be secured while corresponding to the number of poles. Since the magnets can maintain a uniform distance, the precision of the concentricity of the rotor is high, and as a result, not only can noise and vibration be relatively reduced during rotation of the motor rotor, but also the efficiency of the motor can be relatively increased. There are advantages to

In addition, since the present invention does not use any adhesive or molding agent for fixing the magnet, it can be an eco-friendly product while preventing cost increase in advance.

In addition, the present invention can stack magnetic steel sheets using equipment capable of rotating and stacking magnetic steel sheets at intervals of 360 degrees/number of poles, and in a manner that interlocks with devices such as pickers and pushers. However, since the process of press-fitting the magnet into the core hole can be automated, mass production and mass production are possible.

1 is a plan view of a magnetic steel plate of a magnet press-fitting motor rotor according to an embodiment of the present invention.
2 is an enlarged plan view of the protruding core hole shown in FIG. 1;
3 is a perspective view for explaining a laminated structure of the magnetic steel sheet shown in FIG. 1;
4 is a perspective view for explaining an assembly relationship between a rotor core formed by stacking magnetic steel plates shown in FIG. 1 and a magnet;
5 is a cross-sectional view taken along line AA shown in FIG. 4;

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is defined by the description of the claims. Meanwhile, terms used in this specification are for describing the embodiments and are not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprises" or "comprising" means the presence or absence of one or more other elements, steps, operations and/or elements other than the recited elements, steps, operations and/or elements; do not rule out additions.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view of a magnetic steel plate of a magnet press-fitting motor rotor according to an embodiment of the present invention, FIG. 2 is an enlarged plan view of a protruding core hole shown in FIG. 1, and FIG. 3 is a magnetic steel plate shown in FIG. It is a perspective view for explaining the laminated structure.

Referring to FIG. 1, this embodiment includes a rotor core 200 (see FIG. 4) made by stacking a plurality of but one type of magnetic steel plate 100 inserted into a rotation shaft (not shown) of a motor, and the rotor It includes magnets 300 coupled to the inside of the core 200 and disposed at equal intervals along the circumferential direction of the rotor core 200 corresponding to the number of poles (eg, 6 poles).

In the present embodiment, the number of poles may be 6 poles, 8 poles, or 10 poles based on a motor commonly used in a vehicle, but 6 poles are described for ease of description and to avoid duplication.

The magnetic steel plate 100 has a center hole 110, four original core holes 120 corresponding to six poles, and one recess core hole 130 (recess core hole). , and one protrusion core hole 140 (protrusion core hole).

The center hole 110 penetrates from the center of the magnetic steel plate 100 in the thickness direction of the magnetic steel plate 100, and a rotation shaft is coupled thereto.

In the center hole 110, fixing protrusions 111 and 112 formed symmetrically with each other on the circumferential surface of the rotation shaft and facing each other at an angle of 180 degrees from the inner surface of the center hole in order to be coupled to a groove (not shown) extending along the rotation shaft are further provided. include The fixing protrusions 111 and 112 may be formed to protrude as one body or as two bodies.

A plurality of one-core holes 120 (eg, four in total) are arranged in the magnetic steel sheet 100 at equal intervals, that is, while maintaining an interval of 60 degrees along the circumferential direction around the center hole 110 .

The one-core hole 120 has a cross-sectional area large enough to simply insert the magnet 300 and a length corresponding to the length of the rotor core 200 in the axial direction.

That is, when looking at one magnetic steel plate 100 as a standard, the magnet 300 can be simply and easily inserted into the one-core hole 120 in consideration of the gap or gap G, but like the present embodiment. When one type of magnetic steel sheet 100 is sequentially stacked as shown in FIG. 3 or 4, the protruding core hole 140 is below or above the one core hole 120 as it is stacked in a rotated state at intervals of 360 degrees/number of poles. ) of the protrusion 142 may be disposed.

The recess core hole 130 is spaced apart from the last one-core hole 120 in a circumferential direction (eg, clockwise) while maintaining a disposition angle of 60 degrees, and has a first recess 131 .

The protruding core hole 140 is spaced apart from the recess core hole 130 in a circumferential or clockwise direction while maintaining a disposition angle of 60 degrees, and has a protrusion 142 in the second recess 141 .

The left space and the right space of the protrusion 142 become a crack prevention space by the second recess 141, or a void space that prevents the deformation of the protrusion 142 from being transmitted to the hole side of the protrusion core hole 140 ( void space). For example, even when an external force is applied to the protrusion 142 in a direction other than the direction in which the magnet 300 is pressed, for example, in an inclined direction or a horizontal direction, the second recess corresponding to the left space and the right space of the protrusion 142 is applied. Only the protrusion 142 is deformed by 141.

The magnet 300 may mean a permanent magnet or a magnetic material used in motors such as conventional motors, generators, and alternators.

When the magnetic steel sheets 100 thus formed are stacked, they are sequentially stacked while rotating at intervals of 360 degrees/number of poles (eg, 60 degrees in the case of 6 poles). As a result, the one core hole 120, the recess core hole 130, and the protruding core hole 140 are stacked to match each other.

As shown in FIG. 3 , based on the stacking direction of the magnetic steel sheet 100, the lower side of the protrusion 142 of the second recess 141 of the protruding core hole 140 of the upper magnetic steel sheet 100 The first recess 131 of the recess core hole 130 of the magnetic steel sheet 100 is disposed.

At this time, only the protrusion 142 is deformed, and the deformation of the protrusion 142 does not affect or deform parts of the magnetic steel sheet 100 except for the protrusion 142, and the magnet 300 can be damaged. no force applied That is, since the deformed protrusion 142 exerts only enough frictional force to fix the magnet 300, the magnet 300 can be press-fitted and mounted, and it is easy to apply an automated process, while using a separate adhesive or molding agent. use becomes unnecessary.

At this time, referring to FIG. 2, one of the one core hole 120, the recess core hole 130, and the protruding core hole 140, after the magnet 300 is inserted, the magnetic steel plate 100 shown in FIG. has a gap (G) smaller than the thickness (t) of For example, when the thickness t of the magnetic steel sheet 100 is 0.3t (here, 1t means 1mm), the gap G may be 0.05 to 0.2 mm.

Referring to FIG. 1 , the recess core hole 130 has a through shape corresponding to the cross section of the magnet 300, is spaced apart from the one core hole 120 along the circumferential direction, and is disposed in the thickness direction of the magnetic steel plate 100. , and includes a first recess 131 formed to enter in the direction of the center hole 110 from the hole side 132 adjacent to the center hole 110 .

Referring to FIGS. 1 and 2 , the protruding core hole 140 is spaced apart from the recess core hole 130 in the circumferential direction, passes through the magnetic steel sheet 100 in the thickness direction, and is located in the center hole 110. The second recess 141 is formed to enter the center hole 110 from an adjacent hole side 143 and has the same width W2 as the first recess 131 .

The protrusion 142 is formed from the recess side 144 of the second recess 141 adjacent to the center hole 110 in the opposite direction to the center hole 110 (eg, from the center of the magnetic steel sheet to the outer circumference of the magnetic steel sheet). and protrudes more than the hole side 143 of the protruding core hole 140.

The protrusion 142 integrally formed on the recess side 144 of the second recess 141 has a width W1 smaller than the width W2 of the second recess 141, and the magnetic steel sheet 100 ) is formed 1 to 8 times the thickness (t) of.

FIG. 4 is a perspective view illustrating an assembly relationship between a rotor core formed by stacking magnetic steel plates shown in FIG. 1 and a magnet, and FIG. 5 is a cross-sectional view taken along line A-A shown in FIG. 4 .

Referring to FIGS. 3 to 5 , the magnets 300 corresponding to the number of polarities include corresponding one core holes 120, protruding core holes 140, and recess core holes 130 matched with each other in the rotor core 200. ) are inserted or press-fitted, respectively.

The protrusion 142 of the protrusion core hole 140 is deformed to be inclined or bent toward the insertion or press-in direction of the magnet 300 .

At this time, the protrusion 142 is elastically deformed without interference by the first recess 131 located under the protrusion 142, and at the same time, the end of the protrusion 142 is fixed to the magnet 300, resulting in a magnet ( 300) is perfectly fixed without adhesives or molding agents.

The protrusion 142 and the first recess 131 are formed in plurality in the one core hole 120, the protrusion core hole 140, and the recess core hole 130 of the rotor core 200, and the rotor core Since they are spaced apart in the axial direction of (200), it is possible to exert a fixing force capable of completely fixing the magnet (300).

At this time, when the thickness (t) of the magnetic steel sheet 100 is based on 0.3t, the one core hole 120, the protrusion core hole 140, and the recess core hole 130 excluding the protrusion 142 deformed by press-fitting ) The gap G between the inner surface of the magnet 300 and the outer surface of the magnet 300 may be 0.05 to 0.2 mm.

Therefore, it is possible to prevent excessive magnetic flux saturation in the rotor core 200 by maintaining a gap of at least 2 mm or less in the prior art, and to ensure magnet performance, while ensuring that the magnet is uniform in correspondence with the number of poles. Since the distance can be maintained, the accuracy of the concentricity of the rotor is high, and thus, noise and vibration during rotation of the motor rotor can be relatively reduced, and the efficiency of the motor can be relatively increased.

In addition, in the present embodiment, since the magnet 300 can be fixed only by pressing the magnet 300, a separate adhesive injection and drying process can be eliminated, thereby simplifying the motor rotor manufacturing process.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments expressed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas that are equivalent or within the scope of equivalents should be construed as being included in the scope of the present invention.

100: magnetic steel plate 200: rotor core
300: magnet 110: center hole
120: One core hole 130: Recess core hole
131: first recess 140: protruding core hole
141: second recess 142: protrusion

Claims (5)

A rotor core inserted into the rotating shaft of the motor and made by laminating a plurality of magnetic steel plates, coupled to the inside of the rotor core, and magnets disposed at equal intervals along the circumferential direction of the rotor core corresponding to the number of poles In the magnet press-fitting motor rotor,
The magnetic steel plate,
a center hole penetrating from the center of the magnetic steel sheet in the thickness direction of the magnetic steel sheet and to which the rotating shaft is coupled;
a plurality of original core holes disposed spaced apart from the periphery of the center hole in a circumferential direction;
a recess core hole spaced apart from the one core hole in a circumferential direction and having a first recess; and
A protrusion core hole spaced apart from the recess core hole in the circumferential direction and having a protrusion in the second recess;
The magnetic steel sheets are sequentially stacked while rotating at intervals of 360 degrees/number of poles so that the one core hole, the recess core hole, and the protrusion core hole coincide with each other, and the first recess is disposed below the protrusion, When the magnet is inserted through the one-core hole, the recess core hole, and the protrusion core hole, the protrusion moves toward the first recess without interference and is deformed while fixing the magnet;
The recess core hole,
a first recess spaced apart from the one core hole in a circumferential direction, penetrating in a thickness direction of the magnetic steel sheet, and formed to enter in a direction of the center hole from a side side of the hole adjacent to the center hole;
The protruding core hole,
spaced apart from the recess core hole in a circumferential direction, penetrating in the thickness direction of the magnetic steel plate, formed to enter in the direction of the center hole from a hole side adjacent to the center hole, and having a width of the first recess Including the second recess having the same width as,
The protrusion extends from the recess side of the second recess adjacent to the center hole in the opposite direction to the center hole and protrudes more than the hole side of the protrusion core hole.
Phosphorus magnet press-fit motor rotor.
According to claim 1,
Any one of the one core hole, the recess core hole, and the protruding core hole penetrates in the thickness direction of the magnetic steel sheet and has a gap smaller than the thickness of the magnetic steel sheet after the magnet is inserted.
Phosphorus magnet press-fit motor rotor.
delete delete According to claim 1,
The protrusion,
Smaller than the width of the second recess and formed 1 to 3 times the thickness of the magnetic steel sheet
Phosphorus magnet press-fit motor rotor.

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