KR102666492B1 - Rotor of drive motor and enhancing the property method for rotor of drive motor - Google Patents

Abstract

The present invention relates to a drive motor rotor, comprising a rotating body on which a coil is wound, a reinforcing member wrapped around the outer circumference of the rotating body, and a filler disposed in the gap between the reinforcing member and the rotating body, The filler couples the reinforcing member and the rotating body and prevents the gap from occurring.
Therefore, the gap between the rotating body and the reinforcing member can be reinforced by being placed as a filler, thereby providing shock absorption and high strength. Therefore, it is effective in preventing separation of the coil wound around the rotating body and damage to the shoe of the rotating body due to the pressure of the coil during high-speed rotation.

Description

Drive motor rotor and drive motor rotor property enhancement method {ROTOR OF DRIVE MOTOR AND ENHANCING THE PROPERTY METHOD FOR ROTOR OF DRIVE MOTOR}

The present invention relates to a drive motor rotor and a method for strengthening the physical properties of the drive motor rotor.

Cars have been running on fuel such as gasoline, diesel, and gas for a long time. Carbon dioxide emissions from fuel combustion are still increasing, creating an air pollution problem.

Due to the adverse environmental effects caused by air pollution and the depletion of fossil fuels, electric vehicles using electric motors are attracting attention. Among these, hybrid vehicles that use an engine as the main power source and an electric motor as an auxiliary power source, or even electric motors, As electric vehicles that use electricity as their main power source are being developed and commercialized, the utilization of electric motors is increasing.

Referring to Figure 1, looking at the rotor 10 of an electric motor, the rotor body 11 to which the rotating shaft is coupled, teeth ( 13) includes. A coil 12 is wound around each of the teeth 13. A shoe 17 supporting the coil 12 is formed on the tooth 13. Additionally, a cover 19 is disposed between the adjacent teeth 13 to ensure insulation between the adjacent coils 12 and to support the centrifugal force acting on the coils 12.

However, when the rotor rotates at a high speed of 19,000 rpm or more due to the high-speed driving of the electric vehicle, the coil (12) is pushed from the teeth (13) to the shoe (17) by centrifugal force, causing damage to the shoe (17) between the covers (19). A crack (17a) occurred.

Republic of Korea Patent No. 10-1578082 (announced on December 16, 2015) Republic of Korea Patent Publication No. 10-2014-0079535 (published on June 27, 2014)

The present invention provides a technology to prevent damage to the drive motor rotor due to coil separation when the rotor of the drive motor rotates at a high speed of 19,000 rpm or more.

A drive motor rotor according to an embodiment of the present invention includes a rotating body on which a coil is wound, a reinforcing member wrapped around the outer circumference of the rotating body, and a filler disposed in a gap between the reinforcing member and the rotating body.

The filler couples the reinforcing member and the rotating body and prevents the gap from occurring.

The filler may include 0 to 50 parts by weight of fiber based on 100 parts by weight of the thermosetting resin.

The fiber may include carbon fiber or glass fiber.

The fiber has a thermal conductivity of 20 W/mK or more and can be formed to have a length of 3 mm to 10 mm.

The thermosetting resin may be made of any one selected from phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane resin, and polyimide resin.

The reinforcing member may be made of carbon fiber reinforced plastic (CFRP).

The rotating body includes a rotor body to which a rotating shaft is coupled, a plurality of teeth arranged along the outer circumference of the rotor body, a coil disposed on the teeth, a shoe protruding from the tooth to support the coil, and an adjacent It may include a plurality of covers disposed between the teeth and coupled to the shoe.

The reinforcing member surrounds the plurality of teeth and the plurality of covers, and the gap is formed between the reinforcing member and the shoe so that the filler can be disposed.

The driving motor rotor may further include a hook that protrudes from the shoe and is formed in a hook shape and is hooked on the filler.

A method of strengthening the physical properties of a driving motor rotor according to an embodiment of the present invention includes adding phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane resin, and polyimide resin to the outer circumference of the rotating body around which the coil is wound. For 100 parts by weight of a thermosetting resin made of any one of the selected ones, 0 to 50 parts by weight of a fiber made of carbon fiber or glass fiber, having a thermal conductivity of 20 W / mK or more and formed in a length of 3 mm to 10 mm A filler containing a filler is applied and wrapped around a reinforcing member made of carbon fiber reinforced plastic, and the filler is located in a gap between the rotating body and the reinforcing member.

According to an embodiment of the present invention, the shoe portion is reinforced as a filler is disposed in the gap created between the shoe and the reinforcing member, thereby providing shock absorption and high strength. Therefore, it is effective in preventing the coil from coming off during high-speed rotation and damage to the shoe due to the pressure of the coil.

According to an embodiment of the present invention, the reinforcing member is combined with the outer surface of the tooth and the outer surface of the shoe through the filler, thereby improving the bonding force of the reinforcing member.

According to an embodiment of the present invention, the hook protruding from the shoe in the form of a hook is caught on the fiber while being buried in the filler. This has the effect of improving the bonding strength between the shoe and the filler, and improves durability by preventing the filler from falling off the shoe when the drive motor rotor rotates at high speed.

1 is a schematic diagram showing a conventional drive motor rotor.
Figure 2 is a schematic diagram showing a drive motor rotor according to an embodiment of the present invention.
Figure 3 is an enlarged view of portion A of Figure 2.
Figure 4 is a schematic diagram showing a state in which a locking ring is formed in the shoe portion of Figure 3.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Throughout the specification, similar parts are given the same reference numerals.

Next, a method for strengthening the physical properties of a drive motor rotor according to an embodiment of the present invention will be described.

The method of strengthening the physical properties of the drive motor rotor according to this embodiment applies a filler to the outer circumference of the rotating body around which the coil is wound. And then wrap it with reinforcing material. The filler is located in the gap between the rotating body and the reinforcing member.

The filler is carbon fiber or glass fiber (per 100 parts by weight of a thermosetting resin made of any one selected from the group consisting of phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane resin, and polyimide resin). Glass fiber), has a thermal conductivity of 20 W/mK or more, and contains 0 to 50 parts by weight of fibers formed in a length of 3 mm to 10 mm.

The reinforcing member may be made of carbon fiber reinforced plastic.

The filler is located in the gap between the rotating body and the reinforcing member to prevent the coil wound around the rotating body from being separated.

Next, a drive motor rotor according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4.

Referring to Figures 2 and 3, the drive motor rotor 100 according to this embodiment includes a rotor body 110, teeth 130, coil 120, shoe 170, and cover 190. It includes a rotating body, a reinforcing member 200, and a filler 300, and prevents the shoe 170 from being damaged by the coil 120 when the rotor body 110 rotates at high speed.

The inside of the rotor body 110 is penetrated along the longitudinal direction. A rotating shaft (not shown) is disposed inside the rotor body 110. The rotating shaft protrudes on both sides of the rotor body 110. End covers (not shown) are coupled to both sides of the rotor body 110 in the longitudinal direction.

The rotor body 110 is located inside the stator (not shown) and is rotatably installed.

The teeth 130 protrude vertically from the outer circumference of the rotor body 110 and are formed along the longitudinal direction. Teeth 130 are arranged along the circumferential direction of the rotor body 110. A space S is formed between adjacent teeth 130. When the rotor body 110 is located inside the stator, the ends of the teeth 130 are spaced apart from the inner circumference of the stator. Accordingly, the drive motor rotor 100 does not interfere with the stator when rotating inside the stator.

The shoes 170 protrude to a predetermined length from both sides of the teeth 130 in the width direction and are formed along the longitudinal direction of the teeth 130. The teeth 130 and shoes 170 are formed in a 'T' shape when viewed from the front. As the shoe 170 protrudes from the tooth 130, its thickness gradually becomes thinner. The lower surface of the shoe 170 is perpendicular to the side of the tooth 130. The upper surface of the shoe 170 has a shape that gradually becomes lower as it moves away from the teeth 130 with respect to the lower surface. The shape of the shoe 170 may vary depending on the design of the drive motor rotor 100.

The coil 120 is wound around each of the teeth 130. The coil 120 is wound around the tooth 130 multiple times along the longitudinal direction. The coil 120 is kept from the teeth 130 by the shoe 170. When current is applied to the coil 120, the drive motor rotor 100 is electromagnetized, and driving torque can be generated through electromagnetic attraction and repulsion between the electromagnets of the drive motor rotor 100 and the electromagnets of the stator.

The cover 190 is located in the space S and is arranged along the longitudinal direction of the teeth 130. The cover 190 includes a coupling portion 191 whose both ends are coupled to the shoe 170, and an insulating portion protruding from the coupling portion 191 in the direction of the rotor body 110 and located between adjacent coils 120. Includes (192).

Locking grooves 191a are formed at both ends of the coupling portion 191 into which the ends of the shoe 170 are inserted. The outer surface of the coupling portion 191 is formed as a flat surface. Due to the shape of the shoe 170, the outer surface of the coupling portion 191 and the outer surface of the shoe 170 form a step.

The insulating portion 192 prevents adjacent coils 120 from contacting each other, and its cross-sectional area becomes narrower in the direction from the coupling portion 191 to the rotor body 110.

This cover 190 may be made of an insulating material. Cover 190 may be made of plastic.

The rotating body is not limited to the rotor body 110, teeth 130, coil 120, shoe 170, and cover 190. The structure of the rotating body can be changed in various ways depending on the design of the drive motor rotor 100.

The reinforcing member 200 surrounds the outer periphery of the teeth 130 and the cover 190. That is, the reinforcing member 200 entirely surrounds the outer circumference of the drive motor rotor 100. The reinforcing member 200 is in contact with the outer surface of the tooth 130 and the outer surface of the cover 190. However, the outer surface of the reinforcing member 200 is separated from the inner surface of the reinforcing member 200 due to the step between the shoe 170 and the cover 190. Accordingly, a gap g is formed between the shoe 170 and the reinforcing member 200. Here, the shape of the gap g may be variously formed, such as linear, triangular, semicircular, or square, depending on the shape of the outer surface of the shoe 170.

The reinforcing member 200 may be made of carbon fiber reinforced plastic (CFRP).

The filler 300 fills the gap g and prevents the gap g from occurring between the shoe 170 and the reinforcing member 200. Additionally, the filler 300 combines the reinforcing member 200 with the outer surface of the tooth 130 and the shoe 170. The filler 300 is applied to the shoe 170 before wrapping the reinforcing member 200 around the outer periphery of the teeth 130 and the cover 190. The filler 300 includes 0 to 50 parts by weight of fiber based on 100 parts by weight of the thermosetting resin.

If the fiber exceeds 50 parts by weight, voids may be created between the fiber and the thermosetting resin, which may cause a decrease in physical strength, and galvanic corrosion may occur between the reinforcing member and the rotating body.

On the other hand, when the void is filled only with thermosetting resin, the internal load (centrifugal force) of the rotor body 110 is transmitted to the reinforcing member 200 through the resin and the reinforcing member 200 has sufficient strength without deformation, fiber is omitted. It can be.

The fiber may be carbon fiber or glass fiber. Carbon fiber has better physical properties such as tensile strength and weight than glass fiber. Therefore, carbon fiber can be used alone. However, considering cost, only glass fiber can be used instead of carbon fiber.

However, carbon fiber and glass fiber can also be used together. After winding carbon fiber around the rotor body 110, glass fiber is further wound around the carbon fiber. At this time, glass fiber can protect carbon fiber from external factors such as shock and scratches.

The fiber has a thermal conductivity of 20 W/mK to 100 W/mK or more in consideration of the cooling efficiency of the drive motor rotor 100. If the thermal conductivity is lower than 20W/mK, cooling efficiency may decrease due to low thermal conductivity.

The fibers are formed to have a length of 3 mm to 10 mm. The fibers are arranged along the longitudinal direction of the shoe 170.

If the length of the fiber is less than 3 mm, the problem of it being dispersed in the gap and getting caught between bundles occurs. In addition, if the length of the fiber is formed exceeding 10 mm, the chop-shaped fiber may deviate from the voids that should be filled, resulting in thickness imbalance after curing, and workability is reduced.

Thermosetting resins include phenol resin, which has excellent heat resistance, chemical resistance, and safety; urea resin, which has high elongation strength, bends easily, and has a high torsion temperature due to heat; is hard and heat-resistant, and is resistant to scratches and chemical products. Melamine resin with excellent stability against heat, unsaturated polyester resin with excellent heat resistance and corrosion resistance, epoxy with excellent adhesion to metal materials and excellent physical properties after curing such as heat resistance, electrical insulation, and metal adhesion Resin (epoxy resin), polyurethane resin with excellent impact resistance, abrasion resistance, rigidity, etc. and thermal insulation, excellent mechanical strength based on chemical stability, chemical resistance, weather resistance, heat resistance, insulation, and low dielectric constant. It can be made of any one selected from polyimide with electrical properties.

Thermosetting resins can mainly be epoxy resins. However, in some cases, phenol resin, urea resin, melamine resin, unsaturated polyester resin, polyurethane resin, and polyimide resin may be selectively used.

Meanwhile, referring to Figure 4, a hook-shaped hook 171 may be formed on the outer surface of the shoe 170 to increase the bonding force between the shoe 170 and the filler 300. The hook 171 is arranged along the longitudinal direction of the shoe 170. As the hook of the hook 171 is buried in the filler 300 and caught with the fibers of the filler, the bonding force between the filler 300 and the shoe 170 can be increased.

According to this embodiment, the shoe portion is reinforced as a filler is disposed in the gap created between the shoe and the reinforcing member, thereby providing shock absorption and high strength. Therefore, it is effective in preventing the coil from coming off during high-speed rotation and damage to the shoe due to the pressure of the coil.

According to this embodiment, the reinforcing member is combined with the outer surface of the tooth and the outer surface of the shoe through the filler, which has the effect of improving the bonding force of the reinforcing member.

In the above description and drawings, the filler is placed in the gap between the shoe and the reinforcing member to fill the gap. However, the position of the filler is not limited to this and the filler is placed between the rotor body with the coil wound and the reinforcing member surrounding it. It can be located in grooves, gaps, etc.

For reference, although the drive motor rotor is described as being used in an electric vehicle in the above description and drawings, the application field of the drive motor rotor is not limited to this and is generally used in electric motorcycles, electric bicycles, and washing machines that generate power using electrical energy. , can be applied to any number of vacuum cleaners, etc.

Therefore, the scope of the present invention is not limited to application to electric vehicles, but should be interpreted to mean that it applies to driving devices that generate power using electrical energy.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

100: Drive motor rotor 110: Rotor body
120: Coil 130: Teeth
170: Shoe 171: Hook
190: cover 191: coupling part
191a: Locking groove 192: Insulating portion
200: Reinforcing member 300: Filler

Claims (10)

A rotating body with a coil wound around it,
A reinforcing member wrapped around the outer circumference of the rotating body and
Filler disposed in the gap between the reinforcing member and the rotating body
Including,
The filler combines the reinforcing member and the rotating body and prevents the gap from occurring,
The filler
For 100 parts by weight of thermosetting resin,
Containing 0 to 50 parts by weight of fiber,
The fiber has a thermal conductivity of 20 W/mK or more and is formed in a length of 3 mm to 10 mm.
Drive motor rotor. delete In paragraph 1:
The fiber is a drive motor rotor containing carbon fiber or glass fiber. delete In paragraph 1:
The thermosetting resin is a driving motor rotor made of any one selected from phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane resin, and polyimide resin. In paragraph 1:
The reinforcing member is a drive motor rotor made of carbon fiber reinforced plastic (CFRP). In paragraph 1:
The rotating body is
a rotor body to which a rotating shaft is coupled;
A plurality of teeth arranged along the outer circumference of the rotor body,
the coil disposed on the tooth,
A shoe that protrudes from the teeth and supports the coil, and
A plurality of covers disposed between the adjacent teeth and coupled to the shoe.
Includes,
The reinforcing member surrounds the plurality of teeth and the plurality of covers, and the gap is formed between the reinforcing member and the shoe, where the filler is disposed.
Drive motor rotor. A rotating body with a coil wound around it,
A reinforcing member wrapped around the outer circumference of the rotating body and
Filler disposed in the gap between the reinforcing member and the rotating body
Including,
The filler couples the reinforcing member and the rotating body and prevents the gap from occurring,
The rotating body is
a rotor body to which a rotating shaft is coupled;
A plurality of teeth arranged along the outer circumference of the rotor body,
the coil disposed on the tooth,
A shoe that protrudes from the teeth and supports the coil,
A plurality of covers disposed between the adjacent teeth and coupled to the shoe, and
A hook that protrudes from the shoe and is formed in the shape of a hook and is hung on the filler.
A drive motor rotor including a. A filler containing 0 to 50 parts by weight of fiber is applied to the outer circumference of the rotating body around which the coil is wound, relative to 100 parts by weight of thermosetting resin, and a reinforcing member made of carbon fiber reinforced plastic (CFRP) is wrapped, The filler is located in the gap between the rotating body and the reinforcing member, and the fiber has a thermal conductivity of 20 W/mK or more and is formed in a length of 3 mm to 10 mm.
Method of strengthening the properties of the drive motor rotor. In paragraph 9:
The thermosetting resin is made of any one selected from phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane resin, and polyimide resin,
The fiber includes carbon fiber or glass fiber, and the fiber has a thermal conductivity of 20 W/mK or more and is formed in a length of 3 mm to 10 mm.
Method for strengthening the properties of the drive motor rotor.

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