KR101478838B1 - Fan motor, BLDC motor and rotator for the same - Google Patents

Abstract

The cogging is reduced and the motor is rotated in a low noise and low vibration state and the torque is increased so that the state of low vibration and low noise can be realized only by the simple shape improvement and the manufacturing cost is reduced and manufacturing is made convenient. A plurality of teeth around which coils are wound inside the stator; A rotor spaced inside the stator; A plurality of magnets inserted into a rim of the rotor; A first barrier and a second barrier formed on both sides of the magnet mounting portion into which the magnet is inserted; And at least one third barrier formed at an interval between the first barrier and the second barrier.

Motor, torque

Description

Fan motors, BLDC motors and rotators for the same,

The present invention relates to a fan motor, a BISTEC motor, and a rotor of the BISTEC motor. More particularly, the present invention relates to a fan motor, a BD motor, and a rotor of a BD motor, in which the loss of the Becky EMF coefficient is reduced, the cogging torque is reduced, the manufacturing of the BD motor is facilitated, will be.

The BII DC motor is a brushless motor composed of a stator on which a plurality of salient poles on which coils are wound are formed, and a rotor mounted inside the stator and on which a magnet is installed.

Among these, the IPM BLDC motor (Internal Permanent Magnet Brushless Direct Current Current motor) is a type in which a magnet is installed inside the rotor. Depending on the position where the magnet is installed and the shape of the rotor through which the magnetic force lines of the magnet are passed, And cogging torque are significantly different.

The Back ElectroMotive Force is a factor for evaluating the performance of the BI DS motor, and is a factor for evaluating the torque component due to the magnetic line of force generated by the magnet. The cogging torque is a force to move the rotor in a parallel state in which the magnetic energy is minimum in the mutual relation between the magnet and the stator, irrespective of the current, and acts as a factor of generating vibration and noise during rotation of the rotor.

According to the present invention, under the above-mentioned background, it is possible to reduce the cogging torque and the torque ripple while the Beck EMF coefficient can be maximized, and to provide a fan motor, a BD motor and a BD motor We suggest the former. Further, a fan motor and a bi-DC motor are proposed in which the moldability of the rotor of the motor is improved, the production yield is improved, and the operation performance is improved.

The BD motor of the present invention comprises: a stator; A plurality of teeth around which coils are wound inside the stator; A rotor spaced inside the stator; A plurality of magnets inserted into a rim of the rotor; A first barrier and a second barrier formed on both sides of the magnet mounting portion into which the magnet is inserted; And at least one third barrier formed in the space between the first barrier and the second barrier.

The rotator of the BIU-DC motor according to the present invention is characterized in that a magnet mounting portion in which a magnet is inserted is formed in the rotor, wherein the magnet mounting portion is provided with a first barrier and a second Barrier; At least one third barrier formed on a q-axis of a rotating coordinate system passing through an interval between adjacent magnets; And a bracket formed on the outer periphery of the rotor near the position where the third barrier is formed.

A fan motor according to the present invention comprises: a case; A stator fixed to the fan motor case; And a rotor rotating around the stator, wherein the stator includes a plurality of teeth around which a coil is wound, and the rotor includes a rotating shaft; A plurality of plate members laminated in the longitudinal direction of the rotating shaft; A plurality of magnets inserted into a rim of the plate member; A first barrier and a second barrier formed on both sides of the magnet mounting portion into which the magnet is inserted; And at least one third barrier formed in an interval between the first barrier and the second barrier, wherein the geometric center of the third barrier is a center of a center of a pair of opposing magnets of the plurality of magnets Is placed on the outside of the connecting line.

A fan motor according to the present invention comprises: a case; A stator fixed to the fan motor case; And a rotor rotating around the stator, wherein the stator includes a plurality of teeth around which a coil is wound, and the rotor includes a rotating shaft; A plurality of plate members laminated in the longitudinal direction of the rotating shaft; A plurality of magnets inserted into a rim of the plate member; Wherein the plurality of magnets are spaced apart from each other and provided in parallel to each other so as to reduce leakage magnetic fluxes at positions where the plurality of magnets face each other and are parallel to a center line connecting the centers of the ends of at least one pair of magnets At least one of the lines passes through at least three barriers when the line of the center line is drawn outside the center line.

According to the present invention, the rotor is smoothly rotated and the torque is increased. In addition, no separate current control for vibration and noise reduction is required, no soundproofing agent and vibration damping material are required, and consequently, the material cost is reduced and the power consumption is reduced.

Further, the workability of the rotors of the BIST engine becomes better, so that the product yield is improved, and the motor torque can be expected to be maximized.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. 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 inventions. It will be appreciated, however, that this also falls within the scope of the present invention.

FIG. 1 is a perspective view of an outdoor unit to which the fan motor of the present invention is applied, and FIG. 2 is a perspective view of internal components of the outdoor unit. 2, other components such as a heat exchanger in an outdoor unit are not shown.

1 and 2, the outdoor unit 10 includes an outdoor unit case 12 forming an outer appearance, an outdoor heat exchanger 11 performing heat exchange, and a fan unit 12 for guiding the flow of air discharged from the upper surface portion of the outdoor unit case 12 And a compressor (not shown) for compressing the refrigerant. Inside, a fan motor 17 and a fan 16 are further provided to draw a forced wind tunnel inside the outdoor unit.

The top cover 13 has a substantially circular frame shape, and a circular discharge port is formed on the inside of the top cover 13 so as to pass through the top cover. On the upper surface of the top cover 13, a discharge grill 14 is provided. The discharge grill 14 may be provided by a plurality of wires which are circumferentially / radially crossed or interrelated with each other.

A fan motor (17) is fixed downward from a central portion of the discharge grill (14). The fan motor 17 generates rotational power by a power source applied from the outside, and a fixing bolt 19 provided to the fan motor is formed at an upper end thereof. The fan motor 17 can be fixed to the discharge grill 14 by a fastening operation with the fixing bolt 19 and the fixing nut 22. [ That is, when the fixing bolt 19 is passed through the discharge grill 14 and then the fixing nut 22 is fastened to the fixing bolt 19 from above, the fan motor 17 is moved to the discharge grill 14 It is fixed.

A blowing fan 16 is provided below the fan motor 17. The air blowing fan 16 is rotated by the rotary shaft 18 of the fan motor 17 so that air in the outdoor unit 10 is discharged upward through the discharge guide 13

A motor cap 15 of a predetermined size is further provided on the upper surface of the central portion of the discharge grill 14. The motor cap 15 is formed in a circular shape corresponding to the upper surface of the fan motor 17 to prevent rainwater from penetrating into the upper end of the fan motor 17. [

In the interior of the fan motor case 21 constituting the exterior of the fan motor 17, a BI DC motor is installed. Hereinafter, the BI DC motor will be described in more detail.

3 is a cross-sectional view of a BDC according to an embodiment of the present invention.

Referring to FIG. 3, the BD motor of the present embodiment includes a stator 1 mounted on the outside and a rotor 2 placed inside the stator 1. As shown in FIG. The stator 1 is provided with a plurality of teeth 3 through which coils are wound and a plurality of magnets 4 are fixed to the rotor 2 in correspondence with respective poles. The rotor 2 may be inserted in a state in which a plurality of plates are vertically aligned with a single motor shaft. The magnet 4 is inserted into a magnet placing portion (see 6 in Fig. 3) formed in the rotor 2 and the position of the magnet 4 is set at both ends of the magnet placing portion 6 And is supported by the formed magnet fixing portion 5. It is preferable that the magnet 4 is an Nd magnet for strong magnetic flux. A rotary shaft 18 is inserted in the central portion of the rotor 2 so that the rotational force of the rotor 2 is transmitted to the fan 16.

In the present embodiment, one object is to improve the shape of the rotor 2 so as to achieve the two purposes of minimizing the cogging torque even though the Becky EMF coefficient is not lost. The matters to be considered in order to achieve the above object will be described with reference to the arrangement relationship of the stator and the rotor shown in Fig.

4 is a view for explaining the arrangement relationship between the rotor and the stator. However, Fig. 4 is used as an auxiliary for explaining the embodiments of the present invention, and such a shape is not an essential element of the present invention.

4, the state in which the pair of magnets 4 are in alignment with the teeth 3 at the portions where the pair of magnets 4 are opposed to each other is a state in which the rotor 2 receives strong rotational force, It can be defined as q axis on the coordinate system. The state in which one magnet 4 is aligned with the teeth 3 is a state in which the rotor 2 is to be stopped, and thus, such a rotating state and its position can be defined as a d-axis on a rotating coordinate system . Referring to Fig. 4, the q-axis and the d-axis on the rotating coordinate system will be easily understood.

On the other hand, according to the arrangement state as shown in FIG. 4, a bundle of magnetic force lines, that is, a magnetic flux, will be formed by a pair of adjacent magnets 4. The magnetic flux includes an effective magnetic flux 31 that contributes to generating an electromagnetic force through the teeth 3 and a leakage magnetic flux 32 that does not pass through the teeth 3 and does not contribute to generation of an electromagnetic force Can be distinguished. The leakage magnetic flux 32 does not contribute to the torque of the motor, that is, the torque, so that the leakage flux 32 should be reduced as much as possible. This is because the Beck EMF that determines the motor torque is proportional to the rate of change of the effective magnetic flux per time.

Both the effective magnetic flux 31 and the leakage magnetic flux 32 are generated by a pair of opposing magnets that are spaced apart from each other. Therefore, the magnetic flux passing through the lower side of the center of the magnet end, that is, the side closer to the center of the rotor as viewed from the center of the magnet end, is the effective magnetic flux 31, (32), it does not pass through the teeth (3) and therefore does not have much effect on the motor torque. However, when the magnetic flux passing through the upper side from the center of one end of the magnet, that is, the far side from the center of the rotor viewed from the center of the end of the magnet, is used as the effective magnetic flux 31 The motor torque is increased. However, in the case of the leakage magnetic flux 32, only the rotor 2 is passed without passing through the teeth 3, so that the motor torque can not be strengthened. That is, the leakage magnetic flux 32 does not act to cause motor torque.

In order to reduce the cogging torque, the diameter (D) of the effective magnetic flux should be minimized. This is because the cogging torque is a change in magnetic energy with the rotation angle change, and the larger the change rate of the magnetic flux is, the larger the cogging torque becomes.

The configuration of the rotor of the BIU DC motor and the BIU DC motor according to the present embodiment achieving the above object can be more clearly explained with the enlarged view of the rotor of this embodiment shown in FIG.

5, in order to reduce the loss of the Beck EMF coefficient, first, the portion where the pair of adjacent magnets 4 are in contact with each other, that is, the outer periphery 8 of the rotor in the q-axis is chamfered A removed portion 81 is provided in a shape that is recessed relative to the other portions by a method such as the following. In other words, the portion 81 is provided as a symmetrical linear shape having the deepest wave at the position of the q-axis and the depth of which becomes shallower as the distance from the center of the pie becomes shallower. This increases the air gap formed between the stator and the rotor in the q-axis, and reduces the leakage magnetic flux.

More preferably, the air gap is enlarged to extend to the inner third barrier 73 in order to reduce the leakage magnet 32. In such a case, however, the strength of the edge portion of the rotor 2 is weak It becomes. At this time, when the rotor rotates at a high speed, the magnet 4 may be detached, or the rotor may be damaged during molding, which may cause a failure. Therefore, the third barrier 73 and the pulling portion 81 are formed with a portion 81 so as not to be in contact with each other, that is, a portion 81 having a predetermined thickness t1 therebetween.

Also, the shape of the catching portion 81 is provided in a straight line, which is intended to reduce the cogging torque. Specifically, when the winding portion 81 is provided in a curved shape, the air gap can be increased, but there is a side effect that the diameter D of the effective magnetic flux 31 is increased.

The magnet mounting portion 6 on which the magnet 4 is placed further extends to both sides of the magnet 4 and the extended portion is a barrier through which the magnetic flux can not pass, Two barriers 72 face each other to minimize leakage flux. A protrusion 77 functioning as a magnet fixing portion 5 is formed at a boundary portion between the magnet placing portion 6 and the first barrier 71 and the second barrier 72 so that the magnet 4 is placed on the magnet placing portion 6, it performs the action of supporting the magnet 4. [

In addition, the first barrier 71 and the second barrier 72 are provided in a shape wider in the vertical direction toward both ends, which is an object for further increasing the effective magnetic flux. Although the width of the first barrier 71 and the second barrier 72 increases toward both ends in the vertical direction, the width of the first barrier 71 and the second barrier 72 increases in the downward direction There are more sheep. This is to reduce the leakage magnetic flux 32 so that the magnet 4 is positioned as far as possible to the outside of the stator so that the adjacent magnets 4 are closer to each other so as to reduce the diameter D of the effective magnetic flux will be. The first barrier 71 and the second barrier 72 are formed at an angle of 45 or less with respect to the extending direction of the magnet 4 as the width decreases toward the bottom. This is because unduly large diameters D of the effective magnetic flux are increased.

A third barrier 73 is further formed between the first barrier 71 and the second barrier 72. The third barrier 73 has an advantage that the amount of the leakage magnetic flux 32 is reduced first. This is due to the fact that the propagation of the magnetic flux through the air inside the third barrier 73 is reduced rapidly. Further, in order to further reduce the amount of the leakage magnetic flux 32, it is more preferable that the shape of the third barrier 73 is provided in a substantially trapezoidal shape. A thin rib having a predetermined thickness t1 is provided in the gap between the third barrier 73 and the receiving portion 81 to reinforce the strength of the outer periphery of the rotor. It can be seen that a leak magnetic flux is generated only within the interval of the ribs. The maximum distance of the first barrier 71 or the second barrier 72 from the center of the rotor 2 is the distance from the center of the rotor 2 to that of the third barrier 73 May be longer than the maximum distance.

In order to further reduce the leakage magnetic flux, air may be contained inside the third barrier 73, but a material having a permeability lower than that of the air may be inserted into the third barrier 73. For example, the rubber may be applied as a material filling the interior of the third barrier 73. On the other hand, it goes without saying that the idea that the third barrier 73 is filled with rubber to reduce the leakage magnetic flux can be similarly applied to other barriers.

In addition to the third barrier 73, a barrier may be further provided in this embodiment in order to increase the effective magnetic flux. More specifically, a fourth barrier 74 and a fifth barrier 75 may be further formed in the space between the first barrier 71, the second barrier 72, have. In this case, since the passage of the magnetic flux through the main body of the rotor 2 can be further blocked, an advantage that the number of the effective magnetic fluxes 31 is further increased can be expected. Here, the fourth barrier 74 and the fifth barrier 75 may be provided in the shape of a triangle corresponding to the position where they are placed.

In addition, a sixth barrier 76 may be further formed on the lower side of the third barrier 73. According to the sixth barrier 76, the amount of the effective magnetic flux 31 can be further increased.

In addition, the third barrier 73 may be provided as one unit as described above, but may be provided in a form that the unit is divided into left, right, up, down, or inclined directions. In other words, although the third barrier 73 may be provided largely as a unit between adjacent pair of magnets, in order to reinforce the strength of the rotor or reduce the leakage magnetic flux, . ≪ / RTI >

In the above description, the mutual relationship between the portion 81 and the third barrier 73, which has the greatest influence on the reduction of the leakage magnetic flux, will be described in more detail.

As described above, the effective magnetic flux affecting the motor torque corresponds to only the magnetic flux passing through the teeth among the magnetic flux passing from the center of the rotor toward the center of the end of the magnet. On the other hand, the magnetic flux passing through the rotor in the magnetic flux passing from the center of the rotor at the center of the end of the magnet becomes a leakage magnetic flux, and therefore does not affect the motor torque. Therefore, reducing the leakage magnetic flux in any manner more preferably affects the magnitude of the motor torque.

The distance between the first barrier 73 and the second barrier 73 is set to be within the range where the rigidity is maintained during the rotation of the rotor 2, ) Should be as short as possible. In other respects, when viewed on the BH diagram (magnetic saturation curve) according to the material of the rotor 2, magnetic field H is generated in the gap between the portion 81 and the third barrier 73, It is desirable to allow saturation to occur. Accordingly, the minimum distance between the pulling-out portion 81 and the third barrier 73 is determined by the distance between the pulling-out portion 81 and the third barrier 73, May be shorter than the minimum distance of the first barrier 71 or the second barrier 72.
6 is a diagram showing an example of a magnetic saturation curve.

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Referring to FIG. 6, the horizontal axis is the magnetic field H and the vertical axis is the magnetic flux density B generated in the plate member corresponding to the magnetic field. When the magnetic field is applied to the iron plate constituting the rotor 2, the magnetic flux density generated in the rotor 2 increases in a certain section (AB section). However, when the magnetic saturation curve reaches the point B, The magnetic flux density generated in the rotor 2 hardly increases even if the magnetic field is made stronger. When we reach point B in this magnetic saturation curve, it is said to have reached the state of magnetic saturation. Such a phenomenon is more clearly seen in the case of a long member provided in one direction. When a certain point of a long member is provided thinly to form a neck, when the member is self-saturated only at the net point, Even if magnetic saturation is not achieved, magnetic flux density can not be substantially increased any more.

5, the thickness t1 between the tab 81 and the third barrier 73 is made as short as possible to pass between the tab 81 and the third barrier 73 So that it is possible to achieve even if only the interval between the first portion 81 and the third barrier 73 is minimized.

However, it is difficult to reduce the interval between the infinite portion 81 and the third barrier 73 in terms of the method of processing the plate-shaped member when viewed by the rotor as the laminated structure of the thin plate-like members. In other words, if the spacing between the pulling-in portion 81 and the third barrier 73 is excessively small at the time of processing the rotor provided by a method such as punching the plate-like member, the problem is that the portion is cut at the time of punching . In addition, the strength is weak, which causes a problem that the rotor rotates at high speed or breaks due to impact when the rotation speed changes.

In order to solve this problem and to achieve the object of improving the motor torque and reducing the cogging torque for the purpose of the present invention, the configuration of the rotor is described in detail in an enlarged view of the portion "A" Are presented.

Referring to FIG. 7, the third barrier 73 is placed in the space between the first barrier 71 and the second barrier 72. More specifically, the interval where the first barrier 71 and the second barrier 72 face each other is indicated by "?" In Fig. 7, and the third barrier is placed only in the area of " , It does not extend further to the outside. The reason for having such a configuration is to make the third barrier 73 exist as far as possible when viewed from the center of the rotor 2 and to prevent the first and second barrier 71, So that it is out of the former. The interval t2 between the first barrier 71 and the third barrier 73 and the interval t2 between the second barrier 72 and the third barrier 73 are further reduced, The magnetic flux bypassing the portion 81 and the third barrier 73 is further reduced and the leakage magnetic flux in the magnetic flux passing through the farthest portion from the center of the rotor at the center position of the end portion of the magnet is reduced, You can.

Preferably, the geometrical center of the third barrier 73 formed in the space between the first barrier 71 and the second barrier 72 is a line 1 1 connecting the centers of the opposing ends of the pair of magnets ) To the outside. By doing so, the strength of the lower portion of the third barrier 73 is reinforced, and defects during processing of the rotor can be prevented. In addition, among the magnetic flux passing from the center of the end portion of the magnet to the portion farther from the rotor, Leakage flux can be reduced.

Preferably, when a line parallel to the line 11 connecting the centers of the ends of the opposing pair of magnets is further drawn from the outside of the magnet, at least one of the lines 12 has its own material (For example, the first barrier, the second barrier, and the third barrier) different from the barrier. This eventually acts to interfere with the flow of the magnetic flux flowing through the path that becomes the leakage magnetic flux in the magnetic flux passing from the center of the rotor far from the center of the end of the magnet, thereby further reducing the motor torque.

It is proved that the embodiment of the present invention is optimum by referring to the comparative example in contrast to the embodiment of the present invention proposed in the above-mentioned optimum range.

<Comparative Example>

8 is an enlarged cross-sectional view of a rotor and a stator of a comparative example proposed to demonstrate the effect of this embodiment, and Fig. 9 is a back EMF diagram 36 and a cogging torque diagram 37 of a comparative example.

Referring to FIGS. 8 and 9, in the comparative example, the curved shape of the present embodiment is curved, and the barrier extends to both ends, but it is extended to the upper side, that is, There is no third barrier and no barrier.

In this case, the amount of cogging is indicated by H1.

<Examples>

Fig. 10 is an enlarged cross-sectional view of the rotor and the stator according to the present embodiment, and fourth, fifth, and sixth barriers are enlarged cross-sectional views of the state in which they are removed. Fig. 11 is a cross- (35). Here, the amount of cogging is indicated by H2.

10 and 11, it can be seen that the amount of cogging is reduced by about 40% when compared with the comparative example, and the back emf is a value which is decreased at the maximum value, but when viewed as the integral value I can confirm that it is getting higher.

According to the above description, it has been confirmed that the amount of cogging torque is also reduced by increasing the Beck EMF coefficient by the rotor of the fan motor, the BI DC motor and the BI DC motor according to the present embodiment. Further, by preventing the lowering of the stiffness of the rotor, it is possible to reduce the defect rate of the product and improve the productivity.

However, the rotor of the BD motor and the BD motor according to the above-described embodiment and the fan motor using the same have problems in that the support structure of the magnet 4 is poor and the moldability of the projections (see 77 in FIG. 5) There is a problem. More specifically, the protrusions 77 functioning as the magnet supporting portions 5 can be seen to be cusp to increase the size of the first and second barriers 71 and 72 while supporting the magnets. However, when the rotor rotates at a high speed and changes its rotational speed, there is a problem that the impact applied to the protrusions 77 from the magnets is large, causing the protrusions 77 to break, resulting in a failure of the fan motor as a whole. Further, since the projections 77 are provided as small protrusions having tapered points, the moldability at the time of working the rotor is deteriorated, and even after being processed, the projections 77 are deformed due to a small impact .

Embodiments of a fan motor, a BISTEC motor, and a BISTEC motor for solving such problems are disclosed. It is to be understood, however, that the present invention is not limited to the details of the foregoing description.

FIG. 12 is a plan view of a rotor of a BI DC motor according to another embodiment, and FIG. 13 is an enlarged view of a portion "B" of FIG.

Referring to FIGS. 12 and 13, the capturing portion 181, the third, fourth, fifth, and sixth barrier 173, 174, 175, and 176 are the same as those already described. The first barrier 171 and the second barrier 172 are shaped differently so that the sides of the first and second barriers 171 and 172 close to the center of the rotor serve as the magnet fixing portions 5 177 are elongated in a straight line. In other words, a linear linear support 177 is provided linearly at the inner edge of the first and second barrier 171 and 172 so that the magnet 4 can be supported more stably. According to the linear support portion 177, since the magnet can be stably supported by the linear long shape even if it is pushed in the long side direction by the magnet, the stable supporting action against the magnet is strengthened.

According to this configuration, since the linear support portion 177 is provided not as a protruding protrusion but as a straight, elongated shape, there is no point, so that the molding is advantageous at the time of processing the rotor, have. In addition, the magnetic flux passing through the side closer to the center of the rotor at the center position of the end portion of the magnet does not greatly affect the change of the leakage magnetic flux and the effective magnet in the beginning, and there is almost no change in the amount of the motor torque. In the figure, for convenience of explanation, the fourth, fifth, and sixth barrier are not shown.

The present invention may further include other embodiments in addition to the above-described preferred embodiments.

For example, the fourth, fifth, and sixth barriers may be removed for convenience of strength reinforcement of the rotor and punching of the rotor, but the effect thereof is not clear from the comparison of Figs. 9 and 11 The effect of the present invention is still maintained. However, it is also true that it is preferable to provide more for increasing the effect.

However, the present invention is not limited to such a shape. It is a matter of course that the effect of reducing the leakage magnetic flux and decreasing the diameter D of the effective magnetic flux can be obtained even if it is provided with a certain degree of curvature. Do. However, as already explained, it would be more desirable to provide a straight line in order to obtain the diameter reduction effect of the effective magnetic flux.

According to the present invention, there is an advantage that the cogging is reduced, the motor is rotated in a low noise and low vibration state, and the torque is increased. In addition, since the state of low vibration and low noise can be realized by only simple shape improvement, the manufacturing cost is reduced and the manufacturing is further facilitated. Further, there is an advantage that the workability of the rotor and the post-processing stability are increased.

1 is a perspective view of an outdoor unit to which a fan motor of the present invention can be applied;

FIG. 2 is a perspective view of the internal components of the outdoor unit shown in FIG. 1; FIG.

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

4 is a view showing a state of a magnetic flux according to the arrangement relationship of a rotor and a stator.

5 is a partially enlarged view of the rotor of this embodiment.

6 is a magnetic saturation diagram.

7 is an enlarged view of a portion "A"

8 is an enlarged cross-sectional view of a rotor and a stator of a comparative example proposed to demonstrate the effect of this embodiment.

Fig. 9 is a back EMF diagram and a cogging torque diagram of a comparative example shown in Fig. 8; Fig.

10 is an enlarged cross-sectional view of a rotor and stator according to an embodiment of the present invention.

11 is a back EMF diagram and a cogging torque diagram of the embodiment shown in Fig.

12 is a plan view of a rotor of a BD motor according to another embodiment;

13 is an enlarged view of a portion "B" in Fig.

Claims (16)

Stator; A plurality of teeth around which coils are wound inside the stator; A rotor spaced inside the stator; A plurality of magnet laying portions formed at a rim portion of the rotor; A plurality of magnets inserted into respective magnet mounting portions; A first barrier and a second barrier formed to extend from the respective magnet mounting portions to both sides; A third barrier formed on a q-axis of a rotating coordinate system passing through an interval between adjacent magnets; And And a tapered portion formed on an outer periphery of the rotor, Wherein the third barrier is located between a pair of adjacent first and second barriers, And the q-axis of the rotating coordinate system meets the above-mentioned portion. The method according to claim 1, Wherein the maximum distance of the first barrier or the second barrier from the center of the rotor is longer than the maximum distance of the third barrier from the center of the rotor. The method according to claim 1, And the geometric center of the third barrier is located outside the line connecting the center of the end of the pair of adjacent magnets. The method according to claim 1, Wherein the above-mentioned winding portion is a pair of straight lines symmetrical with respect to a q-axis of the rotating coordinate system. The method according to claim 1, Wherein the minimum distance between the pulling portion and the third barrier is shorter than the minimum distance between the pulling portion and the first barrier or the second barrier. The method according to claim 1, The width of the first barrier and the second barrier is increased toward the side end, Wherein the extending width forms an angle of 45 degrees or less with respect to the extending direction of the magnet. The method according to claim 1, Wherein another barrier is formed between the first barrier or the second barrier and the outer periphery of the rotor. The method according to claim 1, Wherein another barrier is formed between the first barrier and the second barrier, and the q-axis of the rotation coordinate system passes through the another barrier. A rotor of a BD motor, in which a magnet mounting portion for inserting a magnet is formed, A first barrier and a second barrier formed on both sides of the magnet mounting portion; At least one third barrier formed on a q-axis of a rotating coordinate system passing through an interval between adjacent magnets; And A third barrier disposed adjacent to the third barrier, the first barrier being recessed in the outer periphery of the rotor, Wherein the maximum distance of the first barrier or the second barrier from the center of the rotor is longer than the maximum distance of the third barrier from the center of the rotor. 10. The method of claim 9, Wherein the winding portion is drawn most deeply at a portion where the outer periphery of the rotor meets the q-axis of the rotating coordinate system, and the winding portion is a linear shape. 10. The method of claim 9, Wherein another barrier is formed between the first barrier or the second barrier and the outer periphery of the rotor. case; A stator fixed to the case; And A rotor rotatably disposed inside the stator, Wherein the stator includes a plurality of teeth in which a coil is wound inside, In the rotor, A rotating shaft; A plurality of plate members laminated in the longitudinal direction of the rotating shaft; A plurality of magnets inserted into a rim of the plate member; A first barrier and a second barrier formed on both sides of the magnet mounting portion into which the magnet is inserted; At least one third barrier formed at an interval between the first barrier and the second barrier; And A third barrier disposed adjacent to the third barrier, the first barrier being recessed in the outer periphery of the rotor, Wherein the minimum distance between the pulling portion and the third barrier is shorter than the minimum distance between the pulling portion and the first barrier or the second barrier. case; A stator fixed to the case; And A rotor rotatably disposed inside the stator, Wherein the stator includes a plurality of teeth in which a coil is wound inside, In the rotor, A rotating shaft; A plurality of plate members laminated in the longitudinal direction of the rotating shaft; A plurality of magnets inserted into a rim of the plate member; A first barrier and a second barrier formed on both sides of the magnet mounting portion into which the magnet is inserted; And And a plurality of additional barriers positioned between the first barrier and the second barrier and positioned on the q-axis of the rotational coordinate system. The method according to claim 12 or 13, Wherein the first barrier to the third barrier are portions where the plate member is removed or a nonmagnetic member is inserted into the removed portions. The method according to claim 12 or 13, Wherein an outer peripheral surface of the plate-like member corresponding to an intermediate portion of at least one pair of adjacent magnets includes a tapered portion formed to be recessed inward. 16. The method of claim 15, Wherein the fan motor is provided with a pair of straight lines symmetrical to each other.

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