KR20190078176A - Generator - Google Patents

Abstract

The present invention relates to a generator which increases efficiency of a generator by improving flux flow of a stator. According to the present invention, the generator comprises: a housing; a stator fixed to an inner circumference of the housing; and a rotor arranged in the stator and rotated by interaction with the stator. The stator includes: a yoke arranged to be in contact with the inner circumference of the housing and formed of isotropic materials; and a plurality of teeth protruding in a central direction of the inside along an inner circumference of the yoke and formed of anisotropic materials.

Description

Generator {GENERATOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator, and more particularly, to a generator including a stator formed of a combination of an anisotropic material and an isotropic material.

In general motors, the material of the stator and the rotor electrical steel is isotropic (non-directional). This is because unlike a transformer having a flux path in a certain direction, the electric motor has a characteristic It is difficult to use electric steel sheet.

In an electric motor, there are various losses such as iron loss, copper loss, and machine loss. In the case of iron loss, the efficiency is adversely affected by a rapid increase in the high speed region in proportion to the square of the frequency.

There are various reasons why steel loss occurs. In a stator using an electric steel sheet of an isotropic material, a flux is stagnated and iron loss is mainly caused by a loss in a portion where the " magnetic flux density " there is a problem.

A problem to be solved by the present invention is to increase the efficiency of the generator by improving the magnetic flux of the stator.

Another object of the present invention is to provide a generator that maintains and improves the reliability of the stator fastened with a plurality of structures.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a generator according to the present invention includes: a housing; A stator fixed to the inner periphery of the housing; And a rotor disposed inside the stator and rotated by interaction with the stator, wherein the stator comprises: a yoke formed to be in contact with a periphery of the housing and formed of an isotropic material; And a plurality of teeth protruding in an inner center direction along the inner circumference of the yoke and formed of an anisotropic material, so that the flow of the magnetic flux of the stator is improved.

Each of the plurality of teeth of the generator according to the present invention includes a neck protruding from the yoke and formed of an anisotropic material and a tooth protruding from the neck in a direction surrounding the outer periphery of the rotor and formed of an isotropic material , The flow of the magnetic flux of the stator is improved.

The teeth of the generator according to the present invention and the yoke are formed with coupling projections and coupling grooves corresponding to each other at portions where the teeth and the yokes are in contact with each other so that the stator can have a stable structure.

Each of the plurality of teeth of the generator according to the present invention includes a shoe formed of an isotropic material having a shape spaced apart from the yoke by a predetermined distance to surround the outer circumference of the rotor, A first neck which is in contact with the shoe at one end and extends in the yoke direction and is formed of an anisotropic material; And a pair of second necks formed of an anisotropic material so as to be spaced apart from each other in the yoke direction, thereby improving the flow of the magnetic flux of the stator.

Each of the pair of second necks of the generator according to the present invention has a trapezoidal shape, the upper side abuts the first neck, and the lower side abuts the yoke, thereby improving the flow of the magnetic flux of the stator.

A generator according to the present invention is disposed between a pair of teeth disposed adjacent to each other so that one end of the generator is disposed in contact with a shoe of one tooth of a pair of teeth, So that the stator can have a stable structure.

The engagement reinforcing member of the generator according to the present invention is formed of an anisotropic material, so that the magnetic flux of the stator is improved.

The details of other embodiments are included in the detailed description and drawings.

According to the generator of the present invention, there is one or more of the following effects.

First, in an area where the magnetic flux is constant in the stator, anisotropic electric steel sheet is used to improve the flow of the magnetic flux, thereby reducing the magnetic flux saturation region.

Also, as the flux saturation region decreases, iron loss decreases and the generator efficiency can be increased.

Secondly, the plurality of constructions of the stator of the present invention are fastened by the fastening protrusions and the fastening grooves, and the stator has a stable structure including the fastening reinforcement member, thereby improving the reliability of the generator.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a diagram illustrating a generator including a stator and a rotor according to one embodiment of the present invention.
2 is a view showing the arrangement of a stator, a coil, and a rotor according to an embodiment of the present invention.
3 is a view showing magnetic force lines shown in a general stator.
4A is a view showing a general stator.
4B is a view illustrating a stator according to one embodiment of the present invention.
4C is a view illustrating a stator according to another embodiment of the present invention.
4D is a view illustrating a stator according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described with reference to the drawings for explaining a generator according to embodiments of the present invention.

<Generator Configuration>

1 is a diagram illustrating a generator including a stator and a rotor according to one embodiment of the present invention. 2 is a view showing the arrangement of a stator, a coil, and a rotor according to an embodiment of the present invention. 3 is a view showing a magnetic flux distribution in a stator according to one embodiment of the present invention. 4A to 4D are views showing the structure of a stator according to various embodiments of the present invention.

Hereinafter, the internal construction of the generator and the generator according to the present embodiment will be described with reference to FIGS. 1 to 3. FIG.

The generator 100 is connected to the output shaft of the engine 14 to produce electric power at the time of rotation of the output shaft. The generated electric power can be supplied to a power consumption device such as a lighting device or a household appliance installed in the cogeneration generator through a power line have.

Power generated by the generator 100 may be supplied directly to the power consuming device via a power line or may be stored in a battery (not shown) connected to the generator 100 and then supplied from the battery to the power consuming device and the engine 14 .

The generator 100 generates heat due to loss of mechanical damage, mechanical hand, iron loss, permanent magnet, and current and the like caused by the generator being driven. In order to cool the generated heat, the generator 100 according to the present embodiment drives the cooling fan 150 to flow outside air into the generator 100 to cool the inside thereof.

The generator 100 according to the present embodiment may further include a cooling fan 150 connected to the rotor 140 and the shaft 142 to forcibly flow the air inside the generator 100 by rotation. External air flows into the generator 100 through the operation of the cooling fan 150 to cool the stator 120 and the rotor 140.

The cooling fan 150 according to the present embodiment may be disposed inside the housing 110. The cooling fan 150 allows external air to flow through the flow holes formed in the front wall 114 or the rear wall 116 of the housing by the axial flow fan and to flow the internal air to the outside.

The generator 100 according to the present embodiment moves outside air to the inside of the generator to cool the stator 120, the rotor 140 and the coil 132 of the generator 100. The generator 100 according to the present embodiment includes a housing 110 having a hollow interior and forming a cylindrical outer shape, a stator 120 disposed inside the housing 110 and fixed to the inner periphery of the housing 110, A rotor 140 disposed inside the housing 120 and rotated by interaction with the stator 120 and a cooling fan 150 disposed inside the housing 110 for cooling the heat generated by the loss occurring in the generator 100 ).

The housing 110 forms a space in which the stator 120 and the rotor 140 are accommodated. The housing 110 may define a space in which the cooling fan 150 is disposed. Inside the housing 110, a shaft 142 connected to the rotor 140 is disposed through the housing 110. The housing 110 may have a cylindrical shape with a hollow interior.

The housing 110 may include an outer circumferential wall 112 defining a circumferential surface, a front wall 114 disposed on the front and back surfaces of the outer circumferential wall 112, and a rear wall. The front wall 114 and the rear wall 116 may be formed with flow holes through which the air flowing by the cooling fan 150 passes. The shaft 142 may be rotatably supported at both ends of the front wall 114 and the rear wall 116, respectively.

The generator 100 according to the present embodiment includes a stator 120 fixed to a periphery of the housing 110 and a rotor 140 rotatably disposed inside the stator 120. The generator 100 according to the present embodiment includes a shaft 142 connected to the rotor 140 to transmit the rotational force of the rotor 140 and a shaft 142 disposed inside the housing 110 for supporting the shaft 142 And may further include a bearing 118. The bearings may be disposed on the front wall 114 and / or the rear wall 116.

The shaft 142 may be made of a nonmagnetic material that does not flow magnetic flux. The shaft 142 according to the present embodiment may be an STS material.

The rotor 140 according to the present embodiment includes a permanent magnet rotatably installed in the stator 120 and capable of generating current in the coils 132 by using magnetic energy during rotation It may be a cylindrical structure to be installed.

The generator 100 according to the present embodiment includes a coil 132 wound on a stator 120. The stator 120 is disposed so as to surround the outer circumference of the rotor 140.

The stator 120 may include a yoke 122 having a ring shape and disposed on the inner circumference of the housing and a plurality of teeth 124 projecting toward the inner center along the inner circumference of the yoke 122 .

The yoke 122 according to the present embodiment is arranged so that its outer circumference is in contact with the inner circumference of the housing 110. [ The outer circumference of the yoke 122 is entirely in contact with the inner circumference of the housing 110 to conduct heat generated in the stator 120 to the housing. The air passage 130 through which the air flowing by the cooling fan 150 passes may be formed in the yoke 122 according to the present embodiment.

In the yoke 122 according to the present embodiment, nine teeth 124 are formed so as to protrude inward of the yoke 122. Nine teeth are projected around the inner circumference of the yoke 122 of the stator 120 according to the present embodiment. This is according to one embodiment, and the number of teeth 124 projected in consideration of the size of the yoke 122 or the coil to be wound can be changed.

The plurality of teeth 124 may be formed at regular intervals. Each of the plurality of teeth may include a neck 126 protruding from the yoke and a shoe 128 protruding in a direction surrounding a portion of the magnet at the neck 126. The shoe 128 is protruded in opposite directions opposite to each other at an end of the neck 126. The shoe 128 is arranged to face the outer circumference of the rotor 140. A plurality of shoe (s) 128 disposed inside the stator 120 generally form a shape corresponding to the outer circumference of the rotor 140.

The stator 120 has a space in which the coil 132 is wound between the plurality of teeth 124. The coil 132 may be disposed so as to surround each of the plurality of teeth 124. Even if the coil 132 is wound between the plurality of teeth 124, a gap 133 through which air can flow is formed.

Hereinafter, the structure and materials of the stator according to various embodiments of the present invention will be described with reference to FIGS. 4A to 4D.

Referring to FIG. 4A, the stator according to the present embodiment may be composed of an isotropic electrical steel sheet and an anisotropic electrical steel sheet. The yoke 122a according to the present embodiment may be formed of a material different from the teeth 124a. The yoke 122a according to the present embodiment may use an electrical steel sheet of an isotropic material, and the teeth 124a may be an anisotropic electrical steel sheet.

The tooth 124a according to the present embodiment can be coupled with the yoke 122a in a separate configuration. The tooth 124a or the yoke 122a has a fastening protrusion 160 having a structure corresponding to each other, Grooves 162 may be formed.

Referring to FIG. 3, the direction of the magnetic flux formed in the stator is formed along the extending portion of the tooth 124 in the radially formed tooth 124, so that the direction of the magnetic flux is substantially constant.

Specifically, it can be seen that the direction of the magnetic flux is formed to be substantially constant at the neck 126 portion of the tooth 124. On the other hand, in the yoke 122 and the shoe 128, the direction of the magnetic flux is not constant compared to the neck 126.

In the case of an isotropic electrical steel sheet, the flow of magnetic flux is not smooth as compared with anisotropic electrical steel sheet, so that the use of anisotropic electrical steel sheet can smooth the flow of magnetic flux at a portion where the magnetic flux direction is constant.

4B, a stator 120 according to an embodiment of the present invention includes an electric steel plate of an isotropic material having a yoke 122b and a shoe 128b, and an electric steel plate of an anisotropic material using a neck 126b. Can be used. In this case, the region where the magnetic flux direction is constant and the region where the magnetic flux direction is not constant are further segmented, and the neck 126b, which is a region where the magnetic flux direction is constant, is made of an anisotropic electrical steel sheet, An electric steel sheet of an isotropic material is used as the shoe 128b portion of the teeth 122b and the teeth 124b.

The yoke 122b and the neck 126b of the stator 120 according to the present embodiment have different configurations and can be fastened through the structure of the fastening protrusion 160 and the fastening groove 162. [ The neck 126b and the shoe 128b also have different configurations and can be fastened through the structure of the fastening protrusion 164 and the fastening groove 166. [

Referring to FIG. 4C, the yoke 122c and the shoe 128c according to the present embodiment may be formed of an electrical steel sheet of an isotropic material. The stator 120 according to the present embodiment may include a plurality of necks formed of an anisotropic electrical steel sheet.

The stator 120 according to the present embodiment includes a first neck 126c1 fastened to the shoe 128c and extending in a linear direction in the direction of the yoke 122c and a second neck 126c2 extending between the first neck 126c1 and the yoke 122c And a pair of second necks 126c2, 126c3 arranged obliquely with respect to a center line X-X 'formed along the center of the first neck 126c1. The second necks 126c2 and 126c3 may be an anisotropic electrical steel sheet having a trapezoidal shape. The pair of second necks 126c2 and 126c3 may be disposed such that the short upper side abuts the first neck 126c1 and the longer lower side abuts the yoke 122c.

The stator 120 according to the present embodiment may have a fastening protrusion 164 and a fastening groove 166 for fastening the shoe 128c to the first neck 126c1. The first neck 126c1 may have fastening protrusions 160b and 160d and fastening grooves 162b and 162d for fastening the first neck 126c1 to the second neck 126c2 or the third neck 126c3 . The yoke 122c may be formed with fastening protrusions 160a and 160c and fastening grooves 162a and 162c for fastening each other at a portion where the yoke 122c contacts the second neck 126c2 or the third neck 126c3 .

4D, the stator 120 according to the present embodiment further includes a tightening reinforcing member 134 for strengthening the fastening structure of the yoke 122d, the neck 126d and the shoe 128d. The tightening reinforcing member 134 according to the present embodiment is disposed between two adjacent teeth 124d and 124d '. The tightening reinforcing member 134 according to the present embodiment abuts each of the teeth of different teeth 128d and 128d ', one end and the other end of which are disposed adjacent to each other. The tightening reinforcing member 134 according to the present embodiment extends from the outer surface of the shoe 128d along the necks 126d1 and 126d3 and abuts the inner surface of the yoke 122d while the other neck 126d2 ' 'And abuts the outer surface of the shoe 128d' on the other side. The fastening reinforcing member 134 according to the present embodiment can use an anisotropic electrical steel sheet.

The tightening reinforcing member 134 according to the present embodiment is disposed in such a manner as to be sandwiched between a pair of adjacent teeth 124d and 124d 'so that the fastening relationship between the teeth 124d and 124d' and the yoke 122d As shown in FIG.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

100: generator 110: housing
120: stator 122: yoke
124: tooth 126: neck
128: Shu 130: Air passage
132: coil 134: tightening reinforcing member
140: Rotor 142: Shaft
150: Cooling fan

Claims (7)

housing;
A stator fixed to the inner periphery of the housing;
And a rotor disposed inside the stator and rotated by interaction with the stator,
The stator comprises:
A yoke formed to be in contact with the periphery of the housing and formed of an isotropic material; And
And a plurality of teeth protruding in an inner center direction along an inner circumference of the yoke and formed of an anisotropic material. The method according to claim 1,
Wherein each of the plurality of teeth comprises:
A neck protruding from the yoke and formed of an anisotropic material;
And a tooth protruding from the neck in a direction to surround the outside of the rotor and formed of an isotropic material. The method according to claim 1,
Wherein the teeth and the yoke are formed with fastening projections and fastening grooves corresponding to each other at portions where the teeth and the yokes abut each other. The method according to claim 1,
Wherein each of the plurality of teeth comprises:
A shoe formed of an isotropic material and spaced apart from the yoke by a predetermined distance to surround the outer circumference of the rotor;
A first neck which is in contact with the shoe at one end and extends in the yoke direction and is formed of an anisotropic material;
And a pair of second necks formed of an anisotropic material, the pair of necks being disposed between the first neck and the yoke, the center of the second neck being spaced apart from the yoke in the yoke direction. 5. The method of claim 4,
Wherein each of the pair of second necks has a trapezoidal shape, the upper side abuts the first neck, and the lower side abuts the yoke. 5. The method of claim 4,
A pair of teeth disposed adjacent to each other, the one end of the pair of teeth being disposed to abut the shoe of one of the pair of teeth, and the other end of the pair of teeth being disposed to abut the shoe of the other one of the pair of teeth Further comprising a reinforcing member. The method according to claim 6,
Wherein the tightening reinforcing member is formed of an anisotropic material.

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