KR20160040788A - BLDC motor and fixing method of stator housing thereof - Google Patents

BLDC motor and fixing method of stator housing thereof Download PDF

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Publication number
KR20160040788A
KR20160040788A KR1020140134116A KR20140134116A KR20160040788A KR 20160040788 A KR20160040788 A KR 20160040788A KR 1020140134116 A KR1020140134116 A KR 1020140134116A KR 20140134116 A KR20140134116 A KR 20140134116A KR 20160040788 A KR20160040788 A KR 20160040788A
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KR
South Korea
Prior art keywords
stator
core
stator housing
stator core
bldc motor
Prior art date
Application number
KR1020140134116A
Other languages
Korean (ko)
Inventor
김효준
장동열
류종수
성현규
Original Assignee
자화전자(주)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 자화전자(주) filed Critical 자화전자(주)
Priority to KR1020140134116A priority Critical patent/KR20160040788A/en
Publication of KR20160040788A publication Critical patent/KR20160040788A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/09—Magnetic cores comprising laminations characterised by being fastened by caulking

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

A method of securing a stator housing of a BLDC motor and a BLDC motor is disclosed. The BLDC motor and BLDC motor stator housing fixing method according to the present invention can assure ease of operation and improve assembling productivity by stacking a plurality of core slices and keeping the assembling angle constant when stator core is assembled.
By reducing the eccentricity by securing the concentricity of the stator core and the stator housing when assembling the stator core and the stator housing, it is possible to minimize the outer diameter swing of the stator core and suppress noise / vibration generation. By combining the stator core and the stator housing with strong fixing force, .
In addition, since the stator core and the stator housing are fixed by a simple process rather than a conventional bonding method or a heat fusion method, it is possible to secure a safe working environment of the operator, to improve workability and productivity, to prevent unnecessary power loss, And the production efficiency can be increased.

Description

[0001] The present invention relates to a BLDC motor and a fixing method of a stator housing,

The present invention relates to a BLDC motor and a method for securing a stator housing of a BLDC motor. More particularly, the present invention relates to a BLDC motor capable of maintaining a constant assembly angle between a stator core and a stator housing, To a housing fixing method.

Generally, a BLDC motor is an abbreviation of a brushless direct currency motor, which removes a brush and a commutator from a conventional DC motor and replaces it with an electronic rectifier.

Such a BLDC motor can be controlled at various speeds from low speed to high speed as well as reducing mechanical or electrical noise, and is widely employed in compressors of refrigeration cycles and the like.

Conventionally, a conventional BLDC motor includes a stator provided outside and a rotor rotatable inside the stator, and a rotor shaft is press-fitted into the rotor. The stator has a stator core. On the inner surface of the stator core, a tooth portion extending radially from the center side is provided, and a slot through which coils are wound is formed between adjacent tooth portions. A stator housing is coupled to the outside of the stator core.

A plurality of magnets arranged on the outer surface of the rotor core so as to have an alternating polarity; and a shatterproof can inserted in the outer surface of the magnet so as to prevent scattering of the magnet, .

In a conventional BLDC motor having such a configuration, when a current is applied to a coil wound around each tooth of a stator according to the position of the rotor in a PCB including a current application circuit, each tooth portion sequentially changes alternating polarities of the N and S poles Whereby the attractive force generated by the magnetic force between the teeth of the stator and the magnet of the rotor and the magnetic force of the repulsive force act in the tangential direction of the rotor to rotate the rotor.

However, in such a conventional BLDC motor, there is a problem that work safety is impaired and energy is wasted by using an adhesive (bond) which is harmful to the environment in the process of assembling the stator core and the stator housing or by applying a thermal indentation method with high power consumption .

Particularly, in the assembling method using an adhesive (bond), eccentricity due to a gap (gap) formed between the outer diameter of the stator core and the inner diameter of the stator housing is generated and it is difficult to secure concentricity with the rotor after assembling the BLDC motor. There is a problem in that it increases.

In order to solve the above-mentioned problem, Korean Patent No. KR10-1117577 describes the following stator housing fixing method.

Referring to FIG. 1, the stator core 10 is formed by winding a plurality of core pieces 12 in a circular shape. The outer diameter of the circularly-formed stator core 10 is smaller than the inner diameter of the stator housing (not shown) .

The pin 16 is inserted into the pin insertion groove 14 formed in the portion where the both ends of the core piece 12 meet in a state in which the stator housing is disposed outside the stator core 10, ) As the outer diameter increases, the stator core 10 is fixed to the stator housing.

However, according to this conventional technique, since the fixing force with the stator housing is secured by increasing the outer diameter of the stator core 10 by the interference fit of the pin 16, the inner diameter roundness of the stator core 10 is not constant, ) And the stator housing are shifted in concentricity after assembling, there is a great possibility that noise / vibration is generated.

In addition, the pin 16 may be bent or broken when the pin 16 is forcedly inserted, so that time and cost are consumed in the assembling process, resulting in deterioration of productivity and a sufficient fixing force is not applied between the stator core 10 and the stator housing There is a problem that it is difficult to secure the reliability of the finished product.

Accordingly, there is a need for a BLDC motor capable of maintaining a fixed angle of assembly between the stator core and the stator housing, and securing a fixing force and a concentricity, by solving the problems of the above-described conventional techniques.

Embodiments of the present invention are intended to improve operability and productivity of assembly by maintaining a constant assembly angle when assembling a stator core by stacking a plurality of core slices.

In addition, when the stator core and the stator housing are assembled, the concentricity is secured to reduce the eccentricity, thereby minimizing the outer diameter swing of the stator core and suppressing the generation of noise / vibration.

In addition, the stator core and the stator housing are combined with a strong fixing force to secure the reliability of the product.

In addition, by eliminating the use of adhesives harmful to the environment, it is desired to secure a safe working environment for the operator and to improve workability and productivity.

In addition, unnecessary power loss is prevented to lower production cost and increase production efficiency.

According to an aspect of the present invention, there is provided a stator comprising: a stator disposed outside; and a rotor rotatably disposed inside the stator, wherein the stator includes: a stator core having at least one recessed portion; And a stator housing having projecting protrusions.

The stator core may be formed by stacking a plurality of core slices having a predetermined thickness in the direction of the axis of rotation, and the recessed portions may be formed at the same positions of the core slices.

The protrusion may extend in the direction of the rotation axis so as to correspond to the concave portion.

The plurality of core pieces may be laminated so as to form a certain angle of assembly inside the stator housing by stacking the concave portions and the protrusions so as to correspond to each other.

The BLDC motor according to the present invention may further include a press-in portion formed by pressing the outer circumferential side of the stator housing at a position corresponding to the protrusion.

Three of the recessed portions may be formed at a position of 120 degrees with respect to the rotation axis.

According to another aspect of the present invention, there is provided a stator comprising: a stator disposed outside; and a rotor rotatably disposed inside the stator, wherein the stator includes: a stator core having at least one recessed portion; And a stator housing having a press-in portion formed by pressing. The BLDC motor can be provided.

The stator core may be formed by stacking a plurality of core slices having a predetermined thickness in the direction of the axis of rotation, and the recessed portions may be formed at the same positions of the core slices.

Three of the recessed portions may be formed at a position of 120 degrees with respect to the rotation axis.

According to another aspect of the present invention, there is provided a method of manufacturing a stator for a stator, comprising the steps of: stacking core pieces having at least one recessed portion on the inner circumference side of the stator housing to arrange the stator core; and pressing the outer circumferential surface of the stator housing corresponding to the stator portion A method of fixing a stator housing of a BLDC motor including a step of press-fitting can be provided.

The stator housing is formed with protrusions protruding to the inner circumferential side so as to correspond to the concave portions and the plurality of core slices are laminated so as to form a certain assembly angle inside the stator housing by stacking the concave portions and the protrusions so as to correspond to each other.

Three of the recessed portions may be formed at a position of 120 degrees with respect to the rotation axis.

Embodiments of the present invention can ensure ease of operation and improve assembly productivity by maintaining a constant assembly angle when assembling a stator core by stacking a plurality of core slices.

In addition, when the stator core and the stator housing are assembled, the concentricity is secured to reduce the eccentricity, thereby minimizing the outer diameter swinging of the stator core and suppressing the generation of noise / vibration.

In addition, by connecting the stator core and the stator housing with a strong fixing force, the reliability of the product can be secured.

Also, by avoiding the use of adhesives which are harmful to the environment, it is possible to secure a safe work environment for the operator and to improve workability and productivity.

In addition, unnecessary power loss can be prevented, which can lower the production cost and increase the production efficiency.

1 is a perspective view showing a stator structure of a conventional BLDC motor.
2 is a plan view showing a stator core structure of a BLDC motor according to an embodiment of the present invention.
3 is a perspective view illustrating a stator core structure of a BLDC motor according to an embodiment of the present invention.
4 is a plan view showing a process of coupling a stator core and a stator housing of a BLDC motor according to an embodiment of the present invention.
5 is a plan view showing a process of coupling a stator core and a stator housing of a BLDC motor according to another embodiment of the present invention.
6 is a cross-sectional view of a BLDC motor according to an embodiment of the present invention.
7 is an exploded perspective view of a BLDC motor according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

3 is a perspective view illustrating a structure of a stator core of a BLDC motor according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a stator core structure of a BLDC motor according to an embodiment of the present invention. 1 is a plan view illustrating a process of coupling a stator core and a stator housing of a BLDC motor according to an embodiment of the present invention. 5 is a plan view illustrating a process of coupling a stator core and a stator core of a BLDC motor according to another embodiment of the present invention. FIG. 6 is a cross-sectional view of a BLDC motor according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of a BLDC motor according to an embodiment of the present invention; FIG.

2 to 7, a BLDC motor 1000 according to an embodiment of the present invention includes a stator 200 provided outside and a rotor 100 rotatably installed in the stator 200 .

The stator 200 includes a stator core 210 in which core pieces 212 having a predetermined thickness are stacked. The core slice 212 can be formed into a desired thickness and shape through a mold.

 The stator core 210 is provided with a plurality of teeth 220 extending from the periphery of the stator core 210 toward the center. The teeth 220 are provided on the inner circumference of the stator core 210 at predetermined intervals and a slot 230 through which the coils 240 are wound is provided between the teeth 220.

A concave portion 214 is formed on the outer circumferential side of the stator core 210. As described above, the stator core 210 is formed by stacking core pieces 212 having a predetermined thickness. Since the stator core 210 is formed at the same position for each of the core pieces 212, The core slice 212 may be formed to have a certain length extending in the height direction of the BLDC motor 1000, that is, the rotational axis direction when the core slice 212 is stacked.

At least one recessed portion 214 may be formed on the rim of the stator core 210 in a concave shape, but the shape of the recessed portion 214 is not limited thereto and may be modified into various shapes. In the present embodiment, the concave portions 214 are formed at three positions at 120 degrees from each other with respect to the rotation axis.

Here, the recessed portion 214 is formed on the outer circumferential side of the portion where the tooth portion 220 is formed, so that it is possible to prevent the strength of the recessed portion 214 from being weakened or the stress to be concentrated and the breakage to occur.

The stator housing 250 may be formed in a cylindrical shape so as to surround the outer circumferential side of the stator core 210 formed by stacking the core slices 212. The stator housing 250 may have a protrusion 254 protruding toward the inner circumference to correspond to the recessed portion 214.

The protrusion 254 may protrude from the inner circumference of the stator housing 250 in a shape corresponding to the position corresponding to the recessed portion 214 as shown in FIG.

The protrusion 254 may extend in the direction of the axis of rotation so as to correspond to the recessed portion 214 because the recessed portion 214 extends a predetermined length in the direction of the axis of rotation.

Three protrusions 254 may be formed at 120 degrees about the rotation axis so that the protrusions 254 correspond to the three protrusions 254 in the present embodiment.

For example, it is also possible that two of them are formed at 180 degrees, that is, opposite to each other, or each of them may be formed so as to form 90 degrees with each other. Further, the concave portions 214 and the protrusions 254, May be formed.

When the stator core 210 and the stator housing 250 are assembled with each other, the core slice 212 is inserted into the stator housing 250 so as to correspond to the recessed portion 214 and the protrusion 254, The core 210 can be formed.

Since the assembling angle at which the core pieces 212 are laminated is maintained constant by fitting the concave portions 214 and the protrusions 254 in correspondence with each other, the work convenience of the operator is improved and the process of laminating the core pieces 212 Can be easily performed.

4, after the core segment 212 is stacked in the stator housing 250 to assemble the stator core 210, the outer circumferential surface of the stator housing 250 corresponding to the recessed portion 214 The press-fit portion 256 can be formed by pressing the press-fit portion 256 into the recessed portion 214 side.

The press-in portion 256 is also formed on the outer circumferential surface of the stator housing 250 along the height direction, that is, in the rotational axis direction, and presses by applying a large load so that the inner protrusion 254 is strongly pressed toward the recessed portion 214 So that the stator core 210 and the stator housing 250 can be tightly coupled.

The press-fit portion 256 may be formed in a number corresponding to the positions corresponding to the concave portions 214 and the protrusions 254. The greater the number of pressing operations, the greater the fixing force. However, In consideration of securing a proper fixing force, it is preferable that three pieces are formed as in this embodiment.

4 illustrates a process of forming a press-fit portion 256 by applying a load in a state in which the protrusion 254 is formed. However, the present invention is not limited thereto. It is also possible to apply a method of fixing the stator core 210 and the stator housing 250 by pressing the portion corresponding to the pressing portion 256 to form the press-fit portion 256.

By applying such a method of fixing the stator core 210 and the stator housing 250, the assembling angle of the stator core 210 is kept constant by stacking a plurality of core segments 212, Assembly productivity can be improved.

The stator core 210 and the stator housing 250 are assembled in a concentric manner to reduce eccentricity, thereby minimizing external shaking of the stator core 210, suppressing noise / vibration, And the stator housing 250 with a strong fixing force, the reliability of the product can be ensured.

Further, since the stator core 210 and the stator housing 250 are fixed through a simple process other than the conventional bonding method or the heat fusion method, it is possible to secure a safe working environment of the operator and to improve workability and productivity, It is possible to reduce the production cost and increase the production efficiency by preventing the loss.

The assembled stator 200 can be combined with the rotor 100 to complete the BLDC motor 1000. Specifically, the assembled rotor 100 is rotatably disposed at an inner central portion of the stator core 210.

The rotor 100 includes a rotor core 110 having an insertion hole 112 formed at the center thereof, a magnet 120 on an outer circumferential side of the rotor core 110, and a rotor shaft 130).

The rotor core 110 may be made of a steel material, and may be formed in a cylindrical shape having an insertion hole penetrating through the center thereof in the axial direction. A rotor shaft 130 is inserted into the inner circumferential surface of the rotor core 110 where the insertion hole is located and the rotor shaft 130 is positioned at the center of the rotor 100 to serve as a rotating shaft when the rotor 100 rotates. do.

A magnet 120 is disposed on the outer circumferential side of the rotor core 110. The magnet 120 may have a height corresponding to the rotor core 110 and may be formed into a ring shape having an inner circumferential side, But may be integrally formed as a single body.

The rotor 100 may be coupled to the rotor shaft 130 and the magnet 120 by expanding the inner and outer sides of the rotor 100, for example, by pressing the rotor core 110 by a pressing jig (not shown). However, the present invention is not limited thereto, and various coupling methods may be applied to assemble the rotor 100.

A stator insulator 260 is coupled to an upper portion and a lower portion of the stator core 210 and a lower cover 258 is coupled to a lower portion of the stator housing 250. The end of the coil 240 wound on the slot 230 is connected to a current application circuit included in a PCB (Printed Circuit Board) 250 coupled to the upper portion.

The BLDC motor 1000 configured as described above applies a current to the coil 220 wound around each tooth portion 220 of the stator 200 according to the position of the rotor 100 in the PCB 270 including the current application circuit The tooth portions 220 of the stator 200 and the rotor 120 are alternately polarized in the order of the N pole and the S pole and are generated by the magnetic force of the tooth portion 220 of the stator 200 and the magnet 120 of the rotor 100 The magnetic force of the attracting force and the repulsive force acts in the tangential direction of the rotor 100, and the rotor 100 rotates.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

100: rotor 110: rotor core
112: insertion hole 120: magnet
130: rotor shaft 200: stator
210: stator core 214:
220: tooth portion 230: slot
240: coil 250: stator housing
254: protrusion 256:
270: PCB 300: pressure jig
310: jig body 320: jig pressing part
1000: BLDC motor

Claims (12)

A stator provided on the outer side; And
And a rotor rotatably installed in the stator,
Wherein the stator includes a stator core having at least one recessed portion and a stator housing having a protruded portion protruding toward the inner periphery to correspond to the recessed portion. The method according to claim 1,
Wherein the stator core is formed by stacking a plurality of core slices having a certain thickness in the direction of the axis of rotation, and the recessed portions are formed at the same positions of the core slices. 3. The method of claim 2,
And the protruding portion is formed to extend in the direction of the rotational axis so as to correspond to the concave portion. The method according to claim 2, wherein
Wherein a plurality of core slices are laminated inside the stator housing so as to form a certain assembly angle by stacking the recessed portions and the protrusions so as to correspond to each other. 5. The method of claim 4,
And a press-in portion formed by pressing an outer peripheral side of the stator housing at a position corresponding to the protruding portion. 6. The method according to any one of claims 1 to 5,
Wherein the recessed portion is formed at a position at 120 degrees with respect to the rotation axis. A stator provided on the outer side; And
And a rotor rotatably installed in the stator,
Wherein the stator includes a stator core having at least one recessed portion and a stator housing having a press-in portion formed by pressing a position corresponding to the recessed portion. 8. The method of claim 7,
Wherein the stator core is formed by stacking a plurality of core slices having a certain thickness in the direction of the axis of rotation, and the recessed portions are formed at the same positions of the core slices. 9. The method according to claim 7 or 8,
Wherein the recessed portion is formed at a position at 120 degrees with respect to the rotation axis. Disposing a core segment having at least one recessed portion on an inner circumferential side of the stator housing to arrange the stator core; And
And pressing the outer circumferential surface of the stator housing corresponding to the concave portion into the concave portion side. 11. The method of claim 10,
The stator housing has a protruding portion protruding toward the inner circumferential side to correspond to the concave portion,
Wherein a plurality of core slices are stacked inside the stator housing so as to form a certain assembly angle by stacking the recessed portions and the protrusions so as to correspond to each other. 12. The method according to any one of claims 10 to 11,
Wherein the recessed portion is formed at a position of 120 degrees with respect to the rotation axis.
KR1020140134116A 2014-10-06 2014-10-06 BLDC motor and fixing method of stator housing thereof KR20160040788A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109450121A (en) * 2018-11-10 2019-03-08 深圳华引动力科技有限公司 Iron core module, stator core and the switched reluctance machines using it
KR102004161B1 (en) * 2018-03-29 2019-07-26 효성전기주식회사 Easily combinable motor stator
KR102175796B1 (en) * 2019-06-17 2020-11-06 디와이오토 주식회사 Electric water pump apparatus provided with improved assembly structure between stator and housing
EP3993225A1 (en) * 2020-10-28 2022-05-04 Valeo Siemens eAutomotive Germany GmbH Rotating electrical machine and method for manufacturing a rotating electrical machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102004161B1 (en) * 2018-03-29 2019-07-26 효성전기주식회사 Easily combinable motor stator
CN109450121A (en) * 2018-11-10 2019-03-08 深圳华引动力科技有限公司 Iron core module, stator core and the switched reluctance machines using it
CN109450121B (en) * 2018-11-10 2024-05-10 深圳华引动力科技有限公司 Iron core module, stator iron core and switched reluctance motor applying same
KR102175796B1 (en) * 2019-06-17 2020-11-06 디와이오토 주식회사 Electric water pump apparatus provided with improved assembly structure between stator and housing
EP3993225A1 (en) * 2020-10-28 2022-05-04 Valeo Siemens eAutomotive Germany GmbH Rotating electrical machine and method for manufacturing a rotating electrical machine

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