KR100847731B1 - Stator core, brushless direct current motor and assembling method thereof - Google Patents

Abstract

A stator core, a brushless DC motor having the same, and a method of assembling the same are disclosed. A cylindrical inner frame portion having a rotor insertion portion in the center, a plurality of connecting portions protruding radially outward from the outer circumferential surface of the inner frame portion, and an end portion of the connecting portion. And a stator core having an outer frame portion each having an arc-shaped cross section, and having a protruding portion at one end of the inner frame portion, which can easily process a wire, thereby facilitating assembly of a brushless DC motor.

BLDC motor, wire, protrusion

Description

Stator core, brushless DC motor and assembly method thereof {STATOR CORE, BRUSHLESS DIRECT CURRENT MOTOR AND ASSEMBLING METHOD THEREOF}

1 is a cross-sectional view of a conventional stator core.

2 is a perspective view of a stator core according to an embodiment of the present invention.

3 is a plan view illustrating a state in which a wire is wound around a connection part of a stator core according to an exemplary embodiment of the present invention.

4 is a cross-sectional view taken along line AA ′ of FIG. 3.

5 is a perspective view showing the internal configuration of a brushless DC motor according to an embodiment of the present invention.

6 is a cross-sectional view of a brushless DC motor according to an embodiment of the present invention.

7 is a flow chart showing a brushless DC motor assembly method according to an embodiment of the present invention.

<Description of Drawing>

100: stator core 110: rotor insert

130: inner frame portion 150: connecting portion

170: outer frame portion 190: slot

210: wire 230: protrusion

250: housing 270, 275: bearing

290: stator 300: BLDC motor

310: shaft 320: permanent magnet

330: base 350: circuit board

The present invention relates to a method for assembling a stator core and a brushless direct current motor.

Conventional DC motors are economical, easy to control speed, and simple in spite of problems such as vibration and noise generated by mechanical contact between commutator and brush, dust generated by brush wear, and limited life of brush. It has been widely used due to advantages such as ease of design. Recently, as the technology related to the brushless direct current motor (hereinafter referred to as 'BLDC motor') is developed, problems caused by the manufacture of the control device and the fabrication of the core are reduced. As it becomes possible to produce BLDC motors with excellent efficiency over a wide variable speed range, BLDC motors can be used in various fields such as compressor motors for air conditioners such as refrigerators and air conditioners, drive motors for drum washing machines, and mobile phones. Replaced.

In general, BLDC motors are classified into radial gap type and axial gap type, and radial gap type BLDC motors have outer rotor type according to the arrangement of the magnet rotor. And the inner rotor type. In particular, a wireless information device such as a mobile phone requires a motor having a simple structure, long life, low noise, and high reliability. Therefore, an internal rotor-type BLDC motor, which has a rotor disposed on the inner circumferential side of the motor, has an automatic folder drive and a camera drive. It is widely used for automatic functions such as.

A general BLDC motor is composed of a stator core as a stator in which a coil is wound, and a rotor as a rotor having a plurality of magnets. 1 is a cross-sectional view showing a coil wound around a stator core of a conventional internal rotor type BLDC motor having a three-phase four-pole six-slot structure.

Referring to FIG. 1, the stator core has a structure in which six T-shaped frames 513 are protruded inwardly inside the annular frame 511 and a wire 517 is wound around the frame 513. The rotor 519, in which two pairs of N poles and S poles are alternately magnetized, is supported by the rotation shaft 518 to be rotatable inside the stator.

In order to wind the wire 517 to the frame 513, a winding jig is applied to a narrow slot 515 formed between the frame 513 and the frame 513, and a dedicated winding machine is used. When the winding is completed, the wire 517 is wound around the frame 513 and the remaining portion is processed. Such lead wire is electrically connected to a printed circuit board attached to the housing of the BLDC motor later.

However, the process of processing the lead wire in the assembly process of the conventional BLDC motor is not only very inefficient, but may cause a wire breakage, and there is a problem in that preliminary soldering is required to directly solder the wire to a printed circuit board.

The present invention provides a stator core, a BLDC motor, and a method of assembling the wire, which are easy to handle and prevent disconnection, as well as easy to assemble.

Stator core according to an aspect of the present invention is a cylindrical inner frame portion having a rotor insert in the center, a plurality of connecting portions protruding radially outward from the outer circumferential surface of the inner frame portion, and coupled to the ends of the connecting portion, respectively, an arc-shaped cross section It includes an outer frame portion having a, one end of the inner frame portion is provided with a projection.

Embodiments of the stator core according to the present invention may have one or more of the following features. For example, the protrusion may protrude downward from one end of the inner frame portion and have a pin shape, and the wire wound on the connection portion may also be wound on the protrusion.

Brushless DC motor according to an aspect of the present invention has a base having an inner space for accommodating the stator core and one end is open, and a base having a through hole coupled to one end of the housing and formed corresponding to the position of the protrusion And a circuit board electrically connected to the protrusion passing through the through hole.

The circuit board may be electrically connected to the protrusion by soldering, and the circuit board may include a mounting groove or a mounting hole into which the protrusion is inserted.

In accordance with an aspect of the present invention, a method of assembling a brushless DC motor includes winding a wire to a connection portion and a protrusion of a stator core, assembling the stator core into a housing of a brushless DC motor, and a through hole corresponding to the protrusion. Coupling the formed base to one end of the housing to allow the protrusion to be inserted into the through hole; and coupling the circuit board to the rear surface of the base and electrically connecting the protrusion and the circuit board.

Here, the wire can be fixed to the protrusion by soldering the wire to the protrusion, and a mounting groove or a mounting hole into which the protrusion can be inserted is formed in the circuit board, and a process of coupling the circuit board to the rear surface of the base. In the projection may be inserted into the seating groove or seating hole. In addition, the protrusion may be electrically connected to the mounting groove or the mounting hole by soldering.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in the following description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals and redundant description thereof will be omitted. Let's do it.

2 is a perspective view of the stator core 100 according to an embodiment of the present invention, FIG. 3 is a plan view illustrating a state in which the wire 210 is wound around the connection part 150 of the stator core 100 and FIG. It is sectional drawing along the AA 'line | wire of 3. In FIG. 4, the wire 210 is omitted for convenience.

2 to 4, the stator core 100 according to an embodiment of the present invention has a connection portion 150 protruding radially outwardly from its outer circumferential surface with respect to a cylindrical inner frame portion 130 having both ends open. And an outer frame portion 130 formed at one end of each connection portion 150. In addition, the stator core 100 according to an embodiment of the present invention includes a plurality of protrusions 230 in which the inner frame 130 protrudes downward from one end surface.

The stator core 100 according to the present embodiment is characterized in that the wire 210 is wound around the connection portion 150 and the end of the wire 210 is fixed to the protrusion 230. In this way, the wire 210 wound on the connection part 150 is wound around the protrusion 230 to fix the wire 210, and the wire 210 may be prevented from disconnecting the wire 210. Assembly is simplified.

The inner frame part 130 has a cylindrical shape, and a rotor insertion part 110 into which the permanent magnet 320 and the shaft 310 are inserted is formed in the center, as shown in FIG. 6. In addition, the connection part 150 protrudes radially outward at a predetermined interval on the outer circumferential surface of the inner frame part 130 and is connected to the outer frame part 170. One end surface of the inner frame portion 130 protrudes downward along a circumference with a predetermined length.

The protrusion 230 is a portion having a pin shape and protruding downward by a predetermined length, and the end of the wire 210 is wound by a later process. The number of protrusions 230 may be four when the phase of the BLDC motor in which the stator core 100 is used is three phases. That is, in the case of a three-phase stator core 100 as shown in FIGS. 2 to 4, three protrusions are wound around three wires connecting U and U ', V and V' and W and W ', respectively. Four protrusions 230 may be formed, including 230 and one protrusion 230 corresponding to a common terminal thereof.

The protrusion 230 may have a pin shape as shown in FIGS. 2 and 4, but is not limited thereto, and may have a “T” shaped cross section and may be formed in a tapered shape at a predetermined angle. May be

The connection part 150 connects the inner frame part 130 and the outer frame part 170, and a wire 210 is wound around the inner frame part 130 and the outer frame part 170. The number of connections 150 is formed equal to the number of phases of the BLDC motor. In addition, the connection part 150 is disposed at a constant angle along the outer circumferential surface of the inner frame part 130. In FIG. 3, six connection parts 150 are disposed at equal intervals with an angle of 60 degrees.

As shown in FIG. 3, the pair of connections 150 symmetrical with respect to the center of the rotor insert 110 have the same pole. Therefore, in the case of the stator core 100 having three poles as shown in FIG. 3, U, W ', V', U ', W, and V are sequentially positioned in the clockwise direction.

The outer frame portion 170 is formed at the end of the connecting portion 150 and all have the arc shape of the same radius of curvature. Therefore, the outer frame portion 170 and its extension line (not shown) form a circle. A predetermined slot 190 is formed between the outer frame portions 170, and the wire 210 is wound around the connection portion 150 through the slot 190.

According to an embodiment of the present invention, the stator core 100 wound with the wire 210 is fixed to the inside of the BLDC motor 300 as shown in FIG. 6.

5 is a perspective view showing the internal configuration of the BLDC motor 300 according to an embodiment of the present invention, Figure 6 is a cross-sectional view thereof. 5 and 6 illustrate the wire 210 wound on the connection part 150 for convenience.

5 to 6, a BLDC motor 300 according to an embodiment of the present invention includes a housing 250 having an inner space, a stator core 100 located inside the housing 250, and a rotor insertion unit. It is provided with a permanent magnet 320 and a shaft 310 located inside the (110). Both ends of the shaft 310 are rotatably inserted into the bearings 270 and 275. In addition, the housing 250 has a cylindrical shape with one end open, and the base 330 and the circuit board 350 having the through hole 331 are sequentially coupled to the open end.

The stator core 100 is fixed to the center of the housing 250, and the shaft 310 and the permanent magnet 320 are positioned at the center rotor insert 110. The outer frame portion 170 of the stator core 100 faces the inner circumferential surface of the housing 250, and the protrusion 230 has a through hole 331 of the base 330 and a seating hole 351 of the circuit board 350. ) And a part of it protrudes outward.

The permanent magnet 320 located in the rotor insertion unit 110 is attached to the outer circumferential surface of the shaft 310. Both ends of the shaft 310 are rotatably supported by the bearings 270 and 275. Therefore, when a current is applied to the wire wound on the connection part 150 (see 210 of FIG. 3), an electromagnetic force is generated by the interaction between the electric field generated around the wire and the magnetic field generated around the permanent magnet 320. This causes the shaft 310 and the permanent magnet 320 to rotate.

The base 330 fixed to one end of the housing 250 has a disk shape, and a plurality of through holes 331 is formed on one surface of the base 330 corresponding to the protrusion 230 of the stator core 100. In addition, an insertion part 333 protruding in the direction of the stator core 100 is formed on one surface of the base 330. The bearing 275 is inserted in the center of the insertion part 333.

A disk-shaped circuit board 350 is fixed to the back surface of the base 330. A plurality of seating holes (grooves) 351 corresponding to the protrusions 230 are also formed in the circuit board 350, and circuit patterns (not shown) and protrusions 230 formed on the circuit board 350 by a later process. The wire wound in) is electrically connected. Therefore, when the current is supplied from the outside through the circuit board 350, the current is supplied to the wire wound on the connection part 150 through the wire wound on the circuit pattern and the protrusion 230.

Assembly method of the BLDC motor 300 according to an embodiment of the present invention is as shown in FIG. 7 is a flowchart illustrating a method of assembling the BLDC motor 300 according to an embodiment of the present invention. Hereinafter, a method of assembling the BLDC motor 300 according to an exemplary embodiment of the present invention using the stator core 100 and the BLDC motor 300 described above will be described.

Referring to FIG. 7, first, the wire is wound around the connection part 150, and then the end part is wound around the protrusion 230 (S10). The method of winding the wire may be made by using a dedicated winding device or by hand. The number of times the wire is wound around the connection part 150 may vary depending on the specification of the motor, and the winding direction may be configured in the counterclockwise direction. The wires are wound around the protrusions 230 and the remaining parts are fixed to the protrusions 230 by soldering or the like.

After fixing the stator core 100 wound as described above in the housing 250, the permanent magnet 320 and the shaft 310 are inserted (S20). In this case, one end of the shaft 310 may be inserted into the bearing 270.

In addition, the protrusion 230 is inserted into the through hole 331 while fixing the base 330 to one end of the housing 250 (S30). At this time, the other end of the shaft 310 is inserted into the bearing 275 fixed to the insertion portion 333 of the base 330.

In addition, while fixing the base 330, while fixing the circuit board 350 on the back surface of the base 330, the protrusion 230 is inserted into the mounting hole (groove) 351. The wire wound on the protrusion 230 is electrically connected to a circuit pattern (not shown) of the circuit board 350 using soldering.

As described above, the stator core, the BLDC motor, and the assembling method according to the embodiment of the present invention can reduce or eliminate wire breakage and defects because the assembly process is performed after fixing the wire to the protrusion 230. It can improve work efficiency.

Although the embodiments of the present invention have been described above, various changes and modifications of the present invention should also be construed as falling within the scope of the present invention as long as the technical idea of the present invention is implemented.

The present invention can provide a stator core, a BLDC motor, and an assembly method thereof, which can easily handle wires and prevent disconnection, as well as facilitate assembly.

Claims (16)

delete delete delete delete delete A cylindrical inner frame part having a rotor insert in the center thereof, A plurality of connection parts protruding radially outward from the outer circumferential surface of the inner frame part and arranged at equal intervals; An outer frame portion having an arc-shaped cross section, respectively coupled to an end of the connecting portion; A stator core protruding downward from one end of the inner frame part and having a pin-shaped protrusion to which a wire wound around the connection part is wound; A housing having an inner space for accommodating the stator core and having one end open; A base coupled to one end of the housing and having a through hole formed corresponding to the position of the protrusion; And Brushless DC motor comprising a circuit board electrically connected to the protrusion passing through the through hole. The method of claim 6, And the circuit board is electrically connected to the protrusion by soldering. The method of claim 6, The circuit board has a brushless DC motor, characterized in that it comprises a mounting groove or a mounting hole into which the projection is inserted. delete delete The method of claim 6, The stator core is provided with six connection parts, and the protrusions are formed brushless DC motor, characterized in that four are formed. delete Winding wires on the connections and protrusions of the stator core; Assembling the stator core into the housing of the brushless DC motor; Coupling a base having a through hole corresponding to the protrusion to one end of the housing such that the protrusion is inserted into the through hole; And coupling the circuit board to the back surface of the base and electrically connecting the protrusion and the circuit board. The method of claim 13, And winding the wire to the protrusion and fixing the wire to the protrusion through soldering. The method of claim 13, The circuit board is provided with a mounting groove or a mounting hole into which the protrusion can be inserted, And a protrusion part is inserted into the seating groove or the seating hole in the process of coupling the circuit board to the rear surface of the base. The method of claim 15, And the protrusion is electrically connected to the seating groove or the seating hole by soldering.

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