KR20050107644A - Outter rotor type motor having a divided stator - Google Patents

Abstract

The present invention relates to an outer rotor type motor having a plurality of divided stators, the center hole is formed through the center of the body, a plurality of hollow core cylindrical center core formed at a plurality of spaced apart in the circumferential direction on the outer peripheral surface, the coupling portion, A stator having a to-be-engaged portion, the coil being wound, the stator comprising a plurality of split cores continuously arranged in a circumferential direction on an outer surface of the center core; And a rotor disposed outside the stator and formed of a ring-shaped permanent magnet in which magnetic poles of the N and S poles are alternately magnetized in the circumferential direction.

According to the present invention, it is possible to increase the starting ratio and efficiency of the coil wound around the stator, increase the starting torque and the efficiency, and reduce the cogging torque to reduce the noise and vibration of the motor.

Description

 OUTTER ROTOR TYPE MOTOR HAVING A DIVIDED STATOR}

The present invention relates to an outer rotor type motor having a plurality of divided stators, and more particularly, to increase the starting ratio and efficiency of the coil wound around the stator to increase the starting torque and efficiency, and to reduce the cogging torque to reduce the noise and vibration of the motor. The present invention relates to an outer rotor type motor having a split stator that can be reduced.

In general, a brushless dc motor removes mechanical contacts such as a brush and a commutator provided to alternately supply current from a DC motor, and instead has an electronic commutator, which is also referred to as a no-commutator motor. do.

Such brushless motors are classified according to the presence or absence of a stator core and generally have a core type (or radial type) and a coreless type (or axial type) having a cup (cylindrical) structure. (axial type)).

In addition, the core type brushless DC motor has an inner rotor type including a cylindrical stator in which a coil is wound and a rotor in which a cylindrical permanent magnet is disposed at an inner center of the stator so as to have an electromagnet structure in a plurality of protrusions formed on an inner circumference thereof. (inner rotor type), an outer rotor type consisting of a stator with coils wound in a plurality of slots extending radially from an outer surface and a rotor with cylindrical permanent magnets multi-pole magnetized on the outer circumferential surface of the stator. Are classified as).

As shown in FIG. 1, the outer rotor type DC motor 1 includes a stator 10 having a coil 17 wound thereon and a rotor 20 formed of permanent magnets disposed near the outer circumference thereof. The stator 10 has a cylindrical core 13 having a central hole 15 in which a central axis 19 is disposed, and a slot having a 'T' cross section extending radially from an outer surface of the cylindrical core 13 ( A plurality of 11 are integrally provided, and the coil 11 is wound around the slot 11 to form an electric field when a current is supplied.

The rotor 20 is composed of a permanent magnet member in which the magnetic poles 21 of the N and S poles are alternately magnetized in the circumferential direction in a circumferential direction, and has a predetermined size between the magnetic poles 21 and the slots 11. Assembling the stator 10 in the inner circumferential space of the hollow-cylindrical rotor (20) to form a void (G), the rotor 20 is a bearing member provided on the central axis (19) of the stator (10) (Not shown) is rotatably assembled.

Accordingly, when an electric current is alternately supplied to the coil 17 wound on the slot 11 of the stator 10, an electric field generated from the coil 11 and a magnetic field generated from the rotor 20, which is a permanent magnet, are provided. By the interaction, the rotor 20 is rotated in one direction. At this time, the main path of the magnetic flux generated between the stator 10 and the rotor 20 is the magnetic pole of the rotor 20 through the magnetic pole 21, the void (G) and the stator 10 of the rotor 20 To form a magnetic circuit running in the direction.

The winding of the coil 17 to the stator 10 of the outer rotor type motor 1 having such a configuration is performed between the slot 11 and another adjacent slot 11 as shown in FIG. The stator 10 has the vertical axis Y, which is the center of the slot 11 to which the coil 17 is to be wound, in the state in which the winding jig nozzle 30 is disposed in the free space P to be formed. When rotating in one direction and at the same time supply the coil from the end of the nozzle 30, the coil 17 is wound in the corresponding slot (11).

On the other hand, the single components used in high-tech communication devices such as mobile phones recently want a product configuration that can realize small size, precision, and high efficiency. Especially, the motor that generates the rotational driving force can produce torque, which is small in size but with great force. It demands excellent efficiency.

However, in order to increase the torque or efficiency of the outer rotor-type motor 1 having the above-described configuration, a permanent magnet having a large size or a high characteristic is adopted in the rotor 20 so as to increase the spot ratio of the coil. Although it can be used to increase the torque and efficiency of the motor, there is a problem that the size of the motor is increased and the manufacturing cost is increased.

In addition, in the stator 10 of the conventional motor 1, the winding jig 30 enters the coil winding during the coil winding operation, and a space P is necessary for performing the coil winding operation, and the clearance P is a coil Since (17) is a non-winding space, it acted as a factor to reduce the coil spot ratio, which affects the torque and efficiency of the motor.

In addition, since the coil winding operation of the stator 10 using the winding jig 30 has to be performed at the slot opening portion, which is a narrow free space P formed between the slots 11, the winding work time and work load are increased. This lowered the productivity of the work, thereby increasing the manufacturing cost.

The stator 10 having a plurality of slits 11 integrally formed in the cylindrical core 13 has a complicated configuration, and the mold investment cost is relatively high at the time of manufacturing, and a special winding machine with high precision is required to increase the investment cost. there was.

Therefore, the present invention has been proposed in order to solve the conventional problems as described above, the object of which is to improve the torque and efficiency by increasing the spot ratio of the coil wound on the stator, coil winding operation can be easily performed It is an object to provide an outer rotor type motor having a split stator.

Another object of the present invention is to provide an outer rotor type motor having a split stator which can reduce vibration and noise of the motor by reducing cogging torque caused by the repulsive force between the stator and the rotor.

As a technical configuration for achieving the above object, the present invention,

The central hole is formed through the center of the body, and the outer peripheral surface has a plurality of hollow cylindrical cylindrical cores having a plurality of coupling portions spaced in the circumferential direction, and a to-be-coupled portion fixed to the coupling portion, the coil being wound to the outer surface of the central core. A stator comprising a plurality of split cores disposed successively in the circumferential direction;

 By providing an outer rotor-type motor having a split stator, characterized in that it comprises; a rotor made of a ring-shaped permanent magnet is arranged on the outside of the stator, the magnetic poles of the N, S poles alternately magnetized in the circumferential direction; All.

Preferably, the split core has an outer circumferential portion on an arc-shaped cross section in which an outer circumferential surface is disposed with a predetermined gap with the inner circumferential surface of the permanent magnet, and an inner circumference on an arc-shaped cross-section in which an engaged portion fixed to the engaging portion of the central core is formed on the inner circumferential surface. It is composed of a winding portion in which a coil is wound around a body extending radially so as to integrally connect the branch and the outer tooth portion and the inner circumferential support portion.

Preferably, the engaging portion of the split core is at least one or more engaging jaws projecting outwardly, and the engaging portion of the central core is at least one or more engaging grooves recessed inwardly.

Preferably, the engaging portion of the split core is at least one or more coupling grooves recessed inwardly, and the coupling portion of the central core is at least one or more coupling projections protruding outwardly.

More preferably, the coupling jaw and the coupling groove are composed of recessed portions and convex portions which are continuous in a predetermined length in one direction.

Preferably, one end of the outer periphery part protrudes from the upper coupling jaw, and the other end is recessed to form an upper coupling groove fixed to the upper coupling jaw of another adjacent outer periphery part.

In addition, the present invention

The central hole is formed through the center of the body, and the outer peripheral surface has a plurality of hollow cylindrical cylindrical cores having a plurality of coupling portions spaced in the circumferential direction, and a to-be-coupled portion fixed to the coupling portion, the coil being wound to the outer surface of the central core. A stator comprising a plurality of split cores disposed successively in the circumferential direction;

 A rotor formed on the outside of the stator, the rotor consisting of a ring-shaped permanent magnet in which magnetic poles of the N and S poles are alternately magnetized in the circumferential direction; and including a central void formed between the permanent magnet and the central portion of each split core. The outer circumference of each of the split cores corresponding to the permanent magnets is gradually narrowed from the center to the left and right ends so that the outer periphery of the split core is narrower than the gaps formed at both ends. All.

Preferably, the split core is formed on an inner circumferential surface of an outer circumferential portion on an arc-shaped cross section in which a center outer circumferential surface and left and right outer circumferential surfaces are disposed with different voids from the inner circumferential surface of the permanent magnet, and a to-be-connected portion fixed to the engaging portion of the central core. An inner circumferential support portion on an arc-shaped cross section and a winding portion in which a coil is wound on a body extending in a radial direction so as to integrally connect the outer tooth portion and the inner circumferential support portion.

Preferably, the engaging portion of the split core is at least one or more engaging jaws projecting outwardly, and the engaging portion of the central core is at least one or more engaging grooves recessed inwardly.

Preferably, the engaging portion of the split core is at least one or more coupling grooves recessed inwardly, and the coupling portion of the central core is at least one or more coupling projections protruding outwardly.

More preferably, the coupling jaw and the coupling groove are composed of recessed portions and convex portions which are continuous in a predetermined length in one direction.

Preferably, one end of the outer periphery part protrudes from the upper coupling jaw, and the other end is recessed to form an upper coupling groove fixed to the upper coupling jaw of another adjacent outer periphery part.

Hereinafter, the present invention will be described in more detail.

3 is a cross-sectional view of the outer rotor type motor having a split stator according to the present invention, Figure 4 is an exploded perspective view showing a stator provided in the outer rotor type motor according to the present invention.

In the outer rotor type motor 100 of the present invention, as shown in FIGS. 3 and 4, the coil winding is divided into a plurality of stators 110 so as to increase the coil spot by individually winding the coil. It is configured by placing a rotor 120 made of a permanent magnet on the outside of the state.

That is, the stator 110 is composed of a central core 112 and a plurality of split cores 114 assembled to an outer surface thereof. The central core 112 has a central hole 111 formed therein through a body center. The outer surface is provided with a plurality of coupling parts 113 at regular intervals in the circumferential direction to facilitate assembly with the split core 114.

In addition, the split core 114 is integrally provided with a coupled portion 116 that is assembled to the coupling portion 113 of the central core 112 and the assembly portion is welded or bonded and fixed. It is continuously disposed along the circumferential direction on the outer surface of 112, the coil 117 of a predetermined length is wound on the body.

The split core 114 has an outer circumferential portion 114a on an arc-shaped cross section in which an outer circumferential surface is disposed with an inner circumferential surface of the permanent magnet 121 constituting the rotor 120 and a predetermined gap G, and the center core 112. The inner circumferential support portion 114c on the arc-shaped cross-section formed on the inner circumferential surface of the coupling portion 113 and the to-be-engaged portion 116 fixed together with the outer tooth portion 114a and the inner circumferential support portion 114c integrally. The winding portion 114b is wound around the coil 117 to the body extending in the radial direction.

Here, as shown in FIG. 5, the winding of the coil 117 to the split core 114 is performed based on a vertical axis Y that coincides with the center of the body of the split core 114. In a state in which the 114 is rotated in one direction, the coil 117 is wound in multiple layers on the winding part 114b by supplying a coil from the tip of the winding nozzle 130.

At this time, the arc length of the outer circumferential portion 114a is provided longer than the arc length of the inner circumferential support portion 114c, and the coil 117 has both left and right ends of the outer circumferential portion 114a and the inner circumferential support portion (a). The coil 117 is wound to be positioned in an extension line connecting the left and right ends of the 114c, and the coil 117 wound on the winding part 114b is wound on the winding part 114b of the other split core 114 adjacent thereto. It is preferable that the winding is performed so that a gap does not occur between the lines.

In addition, the engaging portion 116 of the inner circumferential support portion 114c constituting the split core 114 is formed of at least one engaging jaw 116a protruding outward, as shown in FIG. The coupling portion 113 formed on the outer surface of the central core 112 is formed of at least one coupling groove 113a recessed inward to couple the central core 112 and the split core 114 together. When the parts are joined to each other and the parts in contact with each other are integrally joined to each other by welding or bonding.

Here, the center core 112 and the split core 114 are joined by welding the portions where the coupling jaw 116a and the coupling groove 113a contact each other by laser welding.

In addition, the central core 112 and the split core 114 may be coupled by bonding to apply an anaerobic bond and a hardener (primer) to a portion where the coupling jaw 116a and the coupling groove 113a are in contact with each other.

 In addition, the engagement portion 116 of the inner circumferential support portion 114c constituting the split core 114 is at least one coupling groove 116c recessed inward, as shown in FIG. The coupling part 113 formed on the outer surface of the center core 112 may be formed of at least one coupling jaw 113c protruding outward.

In addition, the coupling jaw 116a, 113c and the coupling groove 113a, 116c constituting the engaging portion 116 and the coupling portion 113, as shown in Figure 6 (b) (d), It may be constituted by recessed portions 113b and 116d and convex portions 113d and 116b that are constant in length in one direction.

7 is a cross-sectional view showing another embodiment of an outer rotor type motor having a split stator according to the present invention. As shown in the drawing, a plurality of split cores 114 are continuously assembled to the central core 112. In order to improve the coupling force between the split core 114 and another split core 114 adjacent to the split core 114, one end of the outer circumferential portion 114a constituting the split core 114 protrudes from the upper coupling jaw 118a. On the other end, it is preferable to recess the upper coupling groove 118b which is coupled to and fixed to the upper coupling jaw 118a of another adjacent outer peripheral portion 114a.

On the other hand, the rotor 120 is provided with a ring-shaped permanent magnet 121 so as to obtain a rotational driving force rotated in one direction by interaction with the electric field generated when the current supplied to the coil 117 side the stator 110 Rotatably disposed on the outside, and the permanent magnets 121 are magnetized alternately in the circumferential direction of the magnetic poles 122 of the N and S poles.

Figure 8 is a cross-sectional view showing another embodiment of an outer rotor type motor having a split stator according to the present invention, such a motor (110a) is a permanent portion of the outer periphery portion 114a and rotor 120 of the stator 110 It is formed between the stator 110 and the rotor 120 to reduce the cogging torque caused by the change in the magnetoresistance in the gap (G) in accordance with the position change between the magnets 121 to reduce noise and vibration when driving the motor. The gap is changed.

That is, the stator 110 has a plurality of hollow-cylindrical cylindrical cores 112 formed on the outer circumferential surface at a predetermined interval in the circumferential direction as described above, and a to-be-coupled portion fixed to the coupling portion 113 ( A plurality of split cores 114 having a plurality of split cores 114 having coils 117 wound around the plurality of split cores 114 continuously arranged in a circumferential direction on an outer surface of the central core 112. The outer peripheral teeth portion 114a on the arc-shaped cross-section having a central outer circumferential surface and left and right outer circumferential surfaces having voids G1 and G2 having different sizes from the inner circumferential surface of the permanent magnet 121 and the center core 112. The to-be-connected portion 116 fixed to the engaging portion 113 of the inner peripheral surface formed on the inner circumferential surface 114b and the outer tooth portion 114a and the inner circumferential support portion 114b to integrally connect between Winding part 114b in which coil 117 is wound on a body extending in a radial direction It is configured.

In addition, the rotor 120 is disposed outside the stator 110 and provided with an annular permanent magnet 121 in which magnetic poles 122 of the N and S poles are alternately magnetized in the circumferential direction.

The outer circumferential portion 114a of each of the split cores 114 is provided with a cross-sectional shape in which the width of the outer circumference corresponding to the permanent magnets 121 is gradually narrowed from the center to the left and right ends thereof without contact with each other. Central voids G1 formed between the inner circumferential surface of the 121 and the center of the outer circumferential portion 114a, and both ends formed between the inner circumferential surface of the permanent magnet 121 and the left and right ends of the outer circumferential portion 114a. The pores G2 are different from each other, and the central pores G1 are formed to be narrower than the pores G2 at both ends.

In this case, the cogging torque caused by the attraction force generated between the stator 110 and the rotor 120 is reduced by decreasing the thickness of the outer periphery portion (114a) from the center to both ends, when rotating the rotor 120 The force distribution of is largely generated at the center portion of the outer periphery portion, while at both ends is small. Accordingly, as shown in FIG. 9, the cogging torque caused when the rotor 120 is rotated is reduced, so that the rotor 120 can be rotated more smoothly with respect to the stator 110.

In the motor and the conventional motor of the present invention having the above-described configuration, the stator and the rotor have the same outer diameter and the number of magnetic poles, and the same amount of current is supplied for the same time to measure starting torque and output generated during driving, and to each stator. The effective area of the coil to be wound is calculated and shown in Table 1 below.

Here, the inner and outer diameters of the rotor is 12mm and 10.6mm, the outer diameter of the stator is 10mm, the inner diameter of the central hole and the inner diameter of the center core is 4mm, winding the coil to a conventional stator consisting of six slots, The coil was wound around the stator of the present invention consisting of six split cores to calculate the effective area of the coil.

Conventional The present invention % Improvement compared to the past Effective Area of Coil (㎠) 0.013 0.021 66 Starting torque (g.cm) 5.784 8.418 46 Output (W) 0.139 0.174 25

 As can be seen in Table 1, the stator 110 to which the coil 117 is wound comprises a hollow core cylindrical center core 112 and a plurality of split cores 114 which are continuously assembled in the circumferential direction on the outer surface thereof. When the coil 117 is wound and assembled for each winding part 114b of each split core 114, the coil can be wound up to the free space without the need of the free space P for disposing the winding jig as in the related art. As a result, the effective area of the coil can be improved by about 66% compared to winding the coil on the integrated stator 10 of the conventional motor.

In addition, when the coil spot ratio affecting the driving force of the motor is improved, it can be seen that the driving torque of the motor is improved by 46% compared with the conventional, and the maximum power is also improved by 25% compared with the conventional.

According to the present invention as described above, by forming a stator in which the coil is wound so as to form an electric field when supplying current, a plurality of split cores are assembled to the central core, so that the spot ratio of the wound-wound coil can be increased as compared with the conventional integrated stator. Therefore, the driving torque and the maximum efficiency can be improved as compared with the conventional one.

In addition, since the work of winding the coil to the split core can be performed quickly and simply using a low-cost winding jig having a lower precision than the related art, a mold cost for improving assembly workability and manufacturing a split core is conventional. It is cheaper than the integrated stator, and since the scrap of the coil wound can be reduced, the manufacturing cost of the motor can be lowered.

In addition, the gap formed between the stator to which the plurality of split cores are divided and the rotor made of permanent magnets is formed to have a larger size at both ends of the gap than the center void of each split core, thereby generating cogging torque generated when the motor is driven. Since it can be reduced, the effect of reducing the noise and vibration of the motor and improving the driving characteristics of the motor is obtained.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

1 is a cross-sectional view of an outer rotor type motor according to the prior art.

2 is a working state diagram of winding a coil on the stator of FIG.

3 is a cross-sectional view of an outer rotor type motor having a split stator according to the present invention.

Figure 4 is an exploded perspective view showing a stator provided in the outer rotor type motor according to the present invention.

FIG. 5 is a working state diagram of winding a coil on the split stator of FIG. 4.

6 (a), (b), (c) and (d) are perspective views showing various assembling relationships between the split core and the center core constituting the stator of the present invention.

7 is a cross-sectional view showing another embodiment of an outer rotor type motor having a split stator according to the present invention.

8 is a cross-sectional view showing another embodiment of an outer rotor type motor having a split stator according to the present invention.

9 is a graph showing a generation trend of cogging torque according to the machine angle in the motor of the present invention and the conventional motor having the configuration of FIG.

Explanation of symbols on main parts of drawing

100: outer rotor type motor 110: stator

111: center hole 112: center core

113: coupling unit 114: split core

114a: outer peripheral part 114b: winding part

114c: inner circumferential support portion 116: coupled portion

117 coil 120 rotor

121: permanent magnet 122: stimulation

130: winding jig G: void

Claims (12)

The central hole is formed through the center of the body, and the outer peripheral surface has a plurality of hollow cylindrical cylindrical cores having a plurality of coupling portions spaced in the circumferential direction, and a to-be-coupled portion fixed to the coupling portion, the coil being wound to the outer surface of the central core. A stator comprising a plurality of split cores disposed successively in the circumferential direction;  An outer rotor-type motor having a split stator, comprising: a rotor disposed outside the stator and configured with a ring-shaped permanent magnet in which magnetic poles of the N and S poles are alternately magnetized in the circumferential direction. The method of claim 1, The split core includes an outer circumferential portion on an arc-shaped cross section in which an outer circumferential surface is disposed with a predetermined gap with the inner circumferential surface of the permanent magnet, and an inner circumferential support portion on an arc-shaped cross-section in which an engaged portion fixed to the engaging portion of the central core is formed on the inner circumferential surface; An outer rotor-type motor having a split stator, characterized in that the coil is wound around the body extending in the radial direction so as to integrally connect between the outer tooth portion and the inner circumferential support portion. The method of claim 1, The outer rotor-type motor having a split stator, characterized in that the engaging portion of the split core is at least one or more engaging jaws projecting outwardly, and the engaging portion of the central core is at least one or more engaging grooves recessed inwardly. The method of claim 1, The outer rotor-type motor having a split stator, characterized in that the engaging portion of the split core is at least one coupling groove recessed inwardly, and the engaging portion of the central core is at least one engaging jaw projecting outwardly. The method according to claim 3 or 4, The coupling jaw and the coupling groove is an outer rotor-type motor having a split stator, characterized in that consisting of a recessed portion and a convex portion extending in a predetermined length in one direction. The method of claim 1, An outer rotor-type motor having a split stator, wherein an outer coupling protrusion protrudes from one end of the outer periphery part, and an upper coupling groove fixed to the upper coupling jaw of another adjacent periphery tooth part is formed on the other end thereof. The central hole is formed through the center of the body, and the outer peripheral surface has a plurality of hollow cylindrical cylindrical cores having a plurality of coupling portions spaced in the circumferential direction, and a to-be-coupled portion fixed to the coupling portion, the coil being wound to the outer surface of the central core. A stator comprising a plurality of split cores disposed successively in the circumferential direction;  A rotor formed on the outside of the stator, the rotor consisting of a ring-shaped permanent magnet in which magnetic poles of the N and S poles are alternately magnetized in the circumferential direction; and including a central void formed between the permanent magnet and the central portion of each split core. An outer rotor type motor having a split stator, characterized in that the outer circumference of each split core corresponding to the permanent magnet is gradually narrowed from the center to the left and right ends so as to be narrower than the gaps formed at both ends. The method of claim 7, wherein The split core has an outer circumferential portion on an arc-shaped cross section in which a center outer circumferential surface and left and right outer circumferential surfaces are disposed with different voids from the inner circumferential surface of the permanent magnet, and an arc-shaped cross section in which an engaged portion fixed to the engaging portion of the central core is formed on the inner circumferential surface. An outer rotor-type motor having a split stator, characterized in that the coil is wound around the body extending in the radial direction so as to integrally connect between the inner circumferential support portion and the outer tooth portion and the inner circumferential support portion. The method of claim 7, wherein The outer rotor-type motor having a split stator, characterized in that the engaging portion of the split core is at least one or more engaging jaws projecting outwardly, and the engaging portion of the central core is at least one or more engaging grooves recessed inwardly. The method of claim 7, wherein The outer rotor-type motor having a split stator, characterized in that the engaging portion of the split core is at least one coupling groove recessed inwardly, and the engaging portion of the central core is at least one engaging jaw projecting outwardly. The method according to claim 9 or 10, The coupling jaw and the coupling groove is an outer rotor-type motor having a split stator, characterized in that consisting of a recessed portion and a convex portion extending in a predetermined length in one direction. The method of claim 7, wherein An outer rotor-type motor having a split stator, wherein an outer coupling protrusion protrudes from one end of the outer periphery part, and an upper coupling groove fixed to the upper coupling jaw of another adjacent periphery tooth part is formed on the other end thereof.