KR20190130236A - Rotor and driving motor using the same - Google Patents

Abstract

The present invention relates to a rotor and a driving motor using the same. According to an embodiment of the present invention, the rotor comprises: a rotor core; and a plurality of permanent magnets inserted into the inside of the rotor core. The rotor core includes: a magnet insertion hole formed around a hollow into which each of the plurality of permanent magnets is inserted; a cooling flow passage which is a passage inducing refrigerant and is formed to be spaced from surroundings of the magnet insertion hole; and at least one sealant injection hole formed to be in contact with one side of the magnet insertion hole, formed at an opposite side of a core surface close to the cooling flow passage and through which a sealant is injected around the permanent magnet inserted into the magnet insertion hole.

Description

ROTOR AND DRIVING MOTOR USING THE SAME

The present invention relates to a rotor and a driving motor using the same, and more particularly, to form a heat flow path along a path having low heat resistance by forming a sealing material injection position on the opposite side of the cooling oil, based on a permanent magnet inserted into the rotor core. To improve the cooling efficiency of the permanent magnet, and a rotor and a drive motor using the same.

Electric vehicles (EVs) are driven using batteries and motors, without using engines. That is, the electric vehicle drives by using the rotational force of the drive motor by the electricity accumulated in the battery.

By the way, the drive motor is provided with the stator wound by the coil, and the rotor rotatably supported by the case. Here, the rotor is provided with a rotor core disposed inside the stator and a shaft penetrating the rotor core.

Recently, since the driving motor is continuously required for miniaturization, high output, and high efficiency, it is necessary to study to operate more stably in thermal aspects.

In other words, the drive motor loses efficiency by heat. Therefore, the drive motor needs a structure capable of operating stably by appropriately cooling the generated heat. In particular, the heat generated from the driving motor may be a factor causing the demagnetization of the permanent magnet.

Therefore, the drive motor needs to be proposed a structure for improving the cooling efficiency of the permanent magnet by the heat generated.

Republic of Korea Patent Publication No. 10-2004-0084612

An object of the present invention is to form a heat flow path along a path of low heat resistance by forming a sealing material injection position on the opposite side of the cooling oil based on the permanent magnet inserted into the rotor core, to improve the cooling efficiency of the permanent magnet And to provide a drive motor using the same.

The rotor according to the embodiment of the present invention, the rotor core; And a plurality of permanent magnets inserted into the rotor core, wherein the rotor core includes: a magnet insertion hole formed around the hollow to insert each of the plurality of permanent magnets; A passage for inducing a coolant, the cooling passage being spaced apart from the periphery of the magnet insertion hole; And at least one sealing material injection hole formed in contact with one side of the magnet insertion hole, and formed on the opposite side of the core surface close to the cooling flow path, and in which a sealing material is injected around the permanent magnet inserted into the magnet insertion hole.

Each of the plurality of permanent magnets may be one in which the N pole and the S pole are alternately inserted into the magnet insertion port.

The rotor core may be formed by stacking a plurality of thin core plates produced through the punching of a nonmagnetic electrical steel sheet.

The magnet insertion hole may be formed at a position opposite to the teeth of the stator core.

The cooling flow passage forms a vertical through flow passage in a vertical direction of the rotor core to face the permanent magnet and conducts with the vertical through flow passage, and forms a left and right through flow passage in a horizontal direction of the rotor core to form a circulation structure. It may be.

The thickness of the sealing material injected around the permanent magnet inserted into the magnet insertion hole may be that the thickness formed on the core surface close to the cooling channel is thinner than the thickness formed on the core surface close to the stator.

In addition, the drive motor according to an embodiment of the present invention, the stator coil is wound around the teeth of the stator core; A rotor for rotationally driving by a magnetic field formed by applying power to the coil as a plurality of permanent magnets are inserted into the rotor core; And a shaft integrally coupled to the rotor to transmit power to the outside by the rotation of the rotor, wherein the rotor core includes: a magnet insertion hole formed around a hollow to insert each of the plurality of permanent magnets; A passage for inducing a coolant, the cooling passage being spaced apart from the periphery of the magnet insertion hole; And at least one sealing material injection hole formed in contact with one side of the magnet insertion hole, and formed on the opposite side of the core surface close to the cooling flow path, and in which a sealing material is injected around the permanent magnet inserted into the magnet insertion hole.

The present invention can improve the cooling efficiency of the permanent magnet by forming a heat flow path along the path of low heat resistance by forming a sealing material injection position on the opposite side of the cooling oil passage based on the permanent magnet inserted into the rotor core.

In addition, the present invention can form a thin epoxy resin layer by fixing the permanent magnet in close contact with the cooling channel side core surface.

1 is a view showing a drive motor according to an embodiment of the present invention,
2 is a cross-sectional view taken along line AA ′ of the driving motor of FIG. 1;
3 is a view showing a detailed structure of a rotor in the drive motor of FIG.
4 is a view showing a cooling passage in the rotor of FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the following description and the accompanying drawings, detailed descriptions of well-known functions or configurations that may obscure the subject matter of the present invention will be omitted. In addition, it should be noted that like elements are denoted by the same reference numerals as much as possible throughout the drawings.

The terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings, and the inventors are properly defined as terms for explaining their own invention in the best way. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical ideas of the present invention, and various alternatives may be substituted at the time of the present application. It should be understood that there may be equivalents and variations.

In the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated, and the size of each component does not entirely reflect the actual size. The invention is not limited by the relative size or spacing drawn in the accompanying drawings.

When any part of the specification is to "include" any component, this means that it may further include other components, except to exclude other components unless otherwise stated. In addition, when a part is "connected" with another part, this includes not only the case where it is "directly connected" but also the case where it is "electrically connected" with another element between them.

Singular expressions include plural expressions unless the context clearly indicates otherwise. The terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features, numbers, steps It is to be understood that the present invention does not exclude in advance the possibility of the presence or the addition of operations, components, components, or a combination thereof.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

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

1 is a view showing a drive motor according to an embodiment of the present invention, Figure 2 is a view showing a cross-section AA 'of the drive motor of Figure 1, Figure 3 is a detailed structure of the rotor in the drive motor of Figure 1 4 is a view showing a cooling passage in the rotor of FIG.

As shown in FIG. 1 and FIG. 2, the driving motor 100 according to the embodiment of the present invention is a driving motor for a vehicle mounted on an electric vehicle (EV) or a hybrid electric vehicle (HEV). The driving force is generated by converting electrical energy into mechanical energy through an electromagnetic field.

The drive motor 100 includes a stator 10, a rotor 20, and a shaft 30. Here, the housing 40 accommodates the assembly of the stator 10, the rotor 20, and the shaft 30 to be fixed to and supported by the vehicle frame.

The stator 10 generates a magnetic field when power is applied to the coil, and the rotor 20 is driven to rotate by the magnetic field generated in the stator 10 as a plurality of permanent magnets are inserted therein. The shaft 30 is integrally coupled to the rotor 20 to transmit power to the outside by the rotational force of the rotor 20.

First, the stator 10 is wound around the stator core 11 and the teeth of the stator core 11 formed by stacking a plurality of thin core plates manufactured by punching a nonmagnetic electrical steel sheet (eg, silicon steel sheet). A coil 12.

The stator core 11 may be made of an integral whole core, or may be manufactured of an integral core by assembling the split core in an annular shape. In addition, the teeth of the stator core 11 are wrapped with a bobbin of an insulating material on the outer circumferential surface when the coil 12 is wound.

The coil 12 is wound into individual coils of three phases (U phase, V phase, W phase) on the teeth of the stator core 11. The coil 12 is preferably made of copper (Cu), but aluminum (Al) may be used to reduce the weight. In this case, when the coil 12 is used as an aluminum material, an anti-oxidation treatment may be performed.

Next, the rotor 20 includes a plurality of rotor cores 21 and rotor cores 21 formed by stacking a plurality of thin core plates manufactured through punching of nonmagnetic electrical steel sheets (eg, silicon steel sheets). It includes a permanent magnet (22). The rotor 20 is located inside the hollow of the stator 10.

The rotor core 21 has a cylindrical shape having the same thickness as the stator core 11 and has a hollow in which the shaft 30 is inserted in order to transmit power by the rotational force of the rotor 20 to the outside.

Referring to FIG. 3, the rotor core 21 is provided with a magnet insertion hole 21a into which each of the plurality of permanent magnets 22 is inserted at a position opposite to the teeth of the stator core 11 around the hollow. Here, in each of the plurality of permanent magnets 22, the north pole and the south pole are alternately inserted into the magnet insertion hole 21a.

The magnet insertion port 21a needs to be fixed to the permanent magnet 22 after the permanent magnet 22 is inserted. To this end, a sealing material (eg, an epoxy resin) may be injected around the permanent magnet 22 inserted into the magnet insertion hole 21a. At least one sealing material injection hole 21b is formed at one side of the magnet insertion hole 21a.

The rotor core 21 is provided with a cooling passage 21c for discharging heat generated by the rotation of the rotor 20 to the outside. The cooling passage 21c is spaced apart from the periphery of the magnet insertion port 21a. In FIG. 3, the cooling passage 21c is formed at the inner circumferential side of the magnet insertion hole 21a, but the cooling passage 21c may be formed at the outer circumferential side of the magnet insertion hole 21a.

As such, the cooling passage 21c serves as a passage for inducing the coolant around the magnet insertion port 21a and serves to lower the temperature of the permanent magnet 22 by cooling the permanent magnet 22. Here, the cooling passage 21c will be described in the case where oil-cooling by oil is applied for convenience of description, but the present invention is not limited thereto, and air cooling by air or water-cooling by water may be applied.

However, the sealing material is a resin having a low thermal conductivity, and may act as a resistance factor of the heat flow path formed between the permanent magnet 22, the rotor core 21, and the cooling passage 21c. That is, the thicker the sealing material is, the greater the thermal resistance that hinders the heat flow, so the thicker the sealing material thickness between the permanent magnet 22 and the cooling passage 21c, the lower the cooling efficiency of the permanent magnet 22.

For this reason, the sealing material injection port 21b is formed in contact with one side of the magnet insertion port 21a, but is preferably formed on the opposite side of the core surface close to the cooling passage 21c. This applies regardless of the case where the cooling passage 21c is formed on the inner circumferential side or the outer circumferential side of the magnet insertion port 21a.

Specifically, the permanent magnet 22 is the inner peripheral side or the outer peripheral core surface of the magnet insertion hole 21a by the injection pressure of the sealing material when the sealing material is injected through the sealing material injection port 21b formed on one side of the magnet insertion hole 21a Close to.

In this case, since the sealing material injection port 21b is formed on the outer circumferential side of the magnet insertion port 21a, the permanent magnet 22 adheres to the inner circumferential side core surface of the magnet insertion port 21a, that is, the core surface close to the cooling flow path 21c. Done. At this time, the sealing material thickness t1 formed on the core surface close to the cooling flow path 21c is formed thinner than the sealing material thickness t2 formed on the core surface near the stator 10.

In other words, the heat generated from the permanent magnet 22 is formed with a thin thickness of the sealing material between the permanent magnet 22 and the rotor core 21, so that the rotor core 21 and the cooling passage 21c along the path of low heat resistance. Go through. That is, the heat flow path formed in the permanent magnet 22, the rotor core 21, and the cooling flow passage 21c has a low heat resistance due to a thin sealing material between the permanent magnet 22 and the rotor core 21, thereby improving heat dissipation characteristics. You can expect

Referring to FIG. 4, the cooling passage 21c forms a vertical through passage in the vertical direction of the rotor core 21 so as to face the inner circumferential side core surface of the magnet insertion hole 21a in which the permanent magnet 22 is in close contact. At this time, the cooling passage 21c does not have a structure in which the cooling oil stays in the upper and lower through passages 21c-1 of the rotor core 21, but passes through the left and right through the upper and lower through passages 21c-1 of the rotor core 21. The flow path 21c-2 may be formed in the horizontal direction of the rotor core 21 to use a structure in which cooling oil can circulate.

Here, the upper and lower through passages 21c-1 are formed wider than the left and right through passages 21c-2 in order to maximize the cooling efficiency by forming a wide area that faces the inner circumferential side core surface of the magnet insertion hole 21a. . That is, the upper and lower through flow passages 21c-1 cause active heat exchange with the permanent magnets 22 closely contacted to the inner circumferential side core surface of the magnet insertion port 21a.

Next, the shaft 30 is integrally coupled to the hollow of the rotor 20 to transmit the power by the rotational force of the rotor 20 to the outside.

In addition, the shaft 30 may include a circulation passage of the cooling passage 21c. That is, the shaft 30 may include a circulation passage connecting the left and right through flow passages 21c-2 and the up and down through flow passages 21c-1 formed in the rotor core 21.

Although the foregoing description has been focused on the novel features of the invention as applied to various embodiments, those skilled in the art will appreciate that the apparatus and method described above without departing from the scope of the invention. It will be understood that various deletions, substitutions, and changes in the form and details of the invention are possible. Accordingly, the scope of the invention is defined by the appended claims rather than in the foregoing description. All modifications within the scope of equivalents of the claims are to be embraced within the scope of the present invention.

10: stator 11: stator core
12: coil 20: rotor
21 rotor core 21a magnetic insertion hole
21b: sealing material inlet 21c: cooling path
21c-1: upper through channel 21c-2: left and right through channel
22: permanent magnet 30: shaft
40 housing

Claims (11)

Rotor core; And
Including; a plurality of permanent magnets inserted into the rotor core;
The rotor core,
A magnet insertion hole formed around the hollow to insert each of the plurality of permanent magnets;
A passage for inducing a coolant, the cooling passage being spaced apart from the periphery of the magnet insertion hole; And
At least one sealing material injection hole formed in contact with one side of the magnet insertion hole, and formed on the opposite side of the core surface close to the cooling flow path, and the sealing material is injected around the permanent magnet inserted into the magnet insertion hole;
Rotor comprising a.
The method of claim 1,
Each of the plurality of permanent magnets,
And the N pole and the S pole are alternately inserted into the magnet insertion port.
The method of claim 1,
The rotor core,
The rotor is formed by stacking a plurality of thin core plate produced through the punching of non-magnetic electrical steel sheet.
The method of claim 1,
The magnetic insertion hole,
And a rotor formed at a position opposite to the teeth of the stator core.
The method of claim 1,
The cooling passage,
The upper and lower through-flow passages are formed in the vertical direction of the rotor core to face the permanent magnets, and are connected to the upper and lower through-flow passages.
The method of claim 1,
The thickness of the sealing material injected around the permanent magnet inserted into the magnet insertion hole,
The thickness formed on the core surface close to the cooling passage is formed to be thinner than the thickness formed on the core surface close to the stator.
A stator having a coil wound around the teeth of the stator core;
A rotor for rotationally driving by a magnetic field formed by applying power to the coil as a plurality of permanent magnets are inserted into the rotor core; And
And a shaft integrally coupled to the rotor for transmitting power from the rotation of the rotor to the outside.
The rotor core,
A magnet insertion hole formed around the hollow to insert each of the plurality of permanent magnets;
A passage for inducing a coolant, the cooling passage being spaced apart around the magnet insertion hole; And
At least one sealing material injection hole formed in contact with one side of the magnet insertion hole, and formed on the opposite side of the core surface close to the cooling flow path, and the sealing material is injected around the permanent magnet inserted into the magnet insertion hole;
Drive motor comprising a.
The method of claim 7, wherein
Each of the plurality of permanent magnets,
The driving motor is inserted into the magnetic pole N and S poles alternately.
The method of claim 7, wherein
The magnetic insertion hole,
A drive motor which is formed at a position opposite to the teeth of the stator core.
The method of claim 7, wherein
The cooling passage,
A driving motor for forming a circulating structure by forming a vertical through flow passage in a vertical direction of the rotor core to face the permanent magnet and conducting with the vertical through flow passage, and forming a left and right through flow passage in a horizontal direction of the rotor core. .
The method of claim 7, wherein
The thickness of the sealing material injected around the permanent magnet inserted into the magnet insertion hole,
And a thickness formed on the core surface close to the cooling channel is thinner than a thickness formed on the core surface close to the stator.

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