KR100955791B1 - LRC motor for high efficiency slim vacuum suction device - Google Patents

Abstract

The present invention relates to a BLDC motor for a highly efficient slim vacuum suction device capable of cooling the heat generated by the vacuum suction device of the robot cleaner without a separate heat dissipation component, making the robot cleaner slim, and improving the productivity.

The present invention provides a rotor in which a plurality of N-pole and S-pole magnets are alternately disposed on the inner circumferential surface of the yoke frame that is bent and extended from the center frame, and a coil is disposed inside the rotor and coupled to each of the plurality of split cores. The individual windings, a stator formed integrally through the stator support by insert molding with a thermosetting resin, a rotating shaft coupled to and rotated by the rotor bushing through the rotor bushing, and a hook integrally formed on the stator support. It is characterized in that it comprises a control PCB for coupling through the hook to secure the stator and apply a driving voltage for the motor.

Robot vacuum cleaner, vacuum suction device, BLDC motor, slim type, miniaturization, suction efficiency

Description

BLD motor for slim type vacuum suction device {BLDC Motor for Slim Type Vacuum Inhaling Apparatus Having High Efficiency}

The present invention relates to a BLDC motor for a high-efficiency slim vacuum suction device, and more particularly, to cool the heat generated by the vacuum suction device of the robot cleaner without a separate heat dissipation component, and to manufacture the robot cleaner in a slim type, and improve productivity. The present invention relates to a BLDC motor for a high efficiency slim vacuum suction device that can be improved.

Many home appliances are being developed and marketed today, among which are vacuum cleaners developed for the cleanliness of residential environments.

The vacuum cleaner is a household appliance that filters the foreign matter from inside the body after inhaling air containing the foreign matter such as dust using a vacuum pressure generated by a BLDC motor mounted inside the cleaner body.

The vacuum cleaner may be classified into a vacuum cleaner which is operated by a user and a robot cleaner which performs cleaning by the user without the user's manipulation. The robot cleaner moves air on the floor of a certain cleaning area according to a program inputted by an internal battery as a power source. After cleaning, perform cleaning operation to filter foreign substances.

In such a robot cleaner, in particular, a wireless robot cleaner using an internal battery as a power source, it is necessary to employ a high efficiency BLDC motor having low power consumption in the vacuum generator to generate vacuum pressure.

The BLDC motor needs a driver including a power driver and a heat dissipation measure is required to quickly dissipate heat generated from the power driver in order to output high power of 100W or more. As described above, in order to dissipate heat generated by the robot cleaner, a separate heat dissipation fin should be provided, the BLDC motor may be wrapped, or the housing in which the BLDC motor is mounted should be formed of a metal having high thermal conductivity such as aluminum. .

Therefore, in the conventional vacuum suction apparatus, heat dissipation is performed by attaching the power driving element of the BLDC motor to the heat dissipation fin or the heat dissipation housing. Therefore, it is difficult to adopt a slim structure in which the BLDC motor is in close contact with the fan guide of the vacuum suction apparatus. That is, it was not possible to design a built-in type to place the drive motor in the space between the fan guide and the control PCB.

In addition, in the case of providing a heat dissipation structure such as a heat dissipation fin or heat dissipation housing for dissipating heat generated by the BLDC motor, the heat dissipation structure must be mounted inside the vacuum suction device of the robot cleaner. Due to the space for mounting the heat radiation structure, the size of the vacuum suction device increases. In addition, when the housing of the BLDC motor is formed of a heat dissipation structure, the weight of the vacuum suction device (ie, the robot cleaner) increases, which causes an increase in power consumption. In addition, if the weight and size of the cleaner are increased in this way, it is an obstacle to designing the housing in a slim type for cleaning a sofa or under a bed.

On the other hand, the robot cleaner basically occupies a very large space such as a secondary battery module for supplying power, a pair of drive motors for independently driving a pair of wheels, and a dust collector, so that a vacuum suction device may be disposed. The space is not big. Furthermore, filters are arranged at the front end and the rear end side of the vacuum suction device, respectively.

In particular, since the conventional vacuum suction device has a total length larger than the height of the space of the slim robot cleaner to be implemented, the vacuum suction device has to adopt an installation structure that is inclined or horizontally disposed when embedded in the housing of the robot cleaner.

As a result, as the vacuum suction device is disposed horizontally or inclined, it has become an obstacle to slimming and miniaturizing the housing of the robot cleaner in which the filters are disposed at the front and the side thereof.

Therefore, by dissipating the heat generated from the BLDC motor of the robot cleaner without any other means such as heat radiation fins, it is required to make the size of the robot cleaner compact and to reduce the weight.

In addition, the robot cleaner is basically required to maximize the suction power and efficiency to suck air in order to clean a large area in a short time with high cleaning. Therefore, in order to maximize the cleaning efficiency of the robot cleaner, the output and rotational force of the motor of the vacuum suction device that sucks air should be maximized, but the output and rotational force of the motor applied to the existing vacuum suction device do not reach the required level and consume. The power to be used also has a big disadvantage.

On the other hand, in the related art, the rotational force of the rotor is transmitted through the center of the impeller by the structure in which the center of the impeller is pressed and supported by the rotor bushing by the impeller bushing having a small diameter. As a result, a phenomenon in which the impeller slips from the rotating shaft during rotation of the rotor is generated, and thus the rotational force of the rotor is not effectively transmitted to the impeller.

In addition, the position of the pair of bearings that support the rotating shaft of the BLDC motor must be accurately set. For this purpose, it is preferably set to 1/100 or less, but in this case, an expensive precision mold should be used. There is a need for a design method that can match the concentricity of bearings without using expensive precision molds.

Therefore, the present invention was devised to solve the above problems, and its object is to reduce the frictional resistance while reducing the passage path of the external air to be sucked in vacuum, thereby increasing the suction efficiency and reducing the power consumption. As a result, the present invention provides a BLDC motor for a high-efficiency vacuum suction device capable of cooling heat generated by a power driving device without a separate heat dissipation means (for example, a heat dissipation fin).

Another object of the present invention is to reduce the power consumption by employing a high efficiency BLDC motor, as a result of high efficiency vacuum suction that can cool the heat generated by the power drive element without a separate heat dissipation means (for example, heat radiation fin) To provide a BLDC motor for the device.

Another object of the present invention is to be designed as a built-in to position the drive motor in the space between the fan guide and the control PCB to minimize the length of the vacuum suction device, as a result can be embedded vertically inside the robot cleaner It is to provide a BLDC motor for a slim vacuum suction device that can make the overall structure of the vacuum cleaner slim.

Another object of the present invention is to provide a BLDC motor for a vacuum suction device having high durability, which can rotate without slipping when the impeller of the vacuum suction device is rotated by the rotation of the motor, effectively receiving the rotational force of the motor.

In order to achieve the above object, the present invention provides a rotor in which a plurality of N-pole and S-pole magnets are alternately arranged on the inner circumferential surface of the yoke frame that is bent and extended from the center frame, and is disposed in each of the plurality of split cores. A stator formed by winding individual coils in a state where bobbins are coupled and insert molding with a thermosetting resin, a stator formed integrally through a stator support, a rotating shaft coupled and rotating to a central portion of the rotor through a rotor bushing, and the stator support It provides a BLDC motor for a vacuum suction device, characterized in that it comprises a control PCB for fixing the stator by applying a hook through a hook formed integrally to the motor and applying a driving voltage to the motor.

The stator is formed of a plurality of split cores, an insulating material, a plurality of bobbins coupled to an outer circumference of the split core, a coil wound in a space provided by the bobbin, and coupled to the control PCB. And a stator support integrated with an insert molding method using a thermosetting resin to form a plurality of split core assemblies having coils wound on bobbins of the split cores. It is preferable that a plurality of protrusions are formed on the inner circumferential surface of the first bearing accommodation groove to minimize the tolerance of the embedded bearing.

The lower plate of the impeller for the vacuum suction device is coupled to the front end of the rotating shaft by fixing means.

The split core may be formed of an 'I' type.

As described above, in the vacuum suction device using the BLDC of the present invention, while the rotational force of the rotor is effectively transmitted to the impeller, the accelerated air flow cools the inside of the motor while passing through a curved passage path having a short path and low frictional resistance. Therefore, the suction efficiency is greatly increased as compared with the prior art, the power consumption is reduced, and as a result, the amount of heat generated by the power driving device is reduced, it is possible to cool without a separate heat dissipation means.

In addition, the vacuum suction device using the BLDC of the present invention can not employ a bulky Al heat dissipation structure, etc. required for cooling the power drive device as in the prior art, thereby positioning the drive motor in the space between the fan guide and the control PCB. It is possible to design with built-in type, so that the overall length can be made slim and small, so it can be arranged vertically on the cleaner, making it slim overall and making it compact.

In addition, when the impeller of the vacuum suction device rotates by the rotation of the motor, it can be effectively rotated by receiving the rotational power of the motor, it is possible to improve the assemblability to manufacture by assembling the motor to the vacuum suction device. .

In addition, when manufacturing the vacuum suction device of the robot cleaner, for example, when manufacturing the stator or PCB cover, etc. of the motor by injection molding, it is possible to reduce the molding conditions to improve productivity.

(Example)

Hereinafter, a BLDC motor for a vacuum suction device according to the present invention will be described in detail with reference to the accompanying drawings. However, in describing the operating principle of the preferred embodiment of the present invention, a detailed description of related known functions or configurations will be omitted. do.

1 to 3 are a perspective view for explaining the external appearance of the robot cleaner to which the present invention is applied, a schematic internal configuration diagram and a bottom view for schematically explaining the internal configuration of the robot cleaner shown in FIG.

1 to 3, the robot cleaner 100 is provided with a main body 110 forming an appearance and a suction force for suctioning external air containing foreign matter by generating a vacuum pressure inside the main body 110. A vacuum suction device 120 for generating a dust, a suction nozzle 130 for sucking air by driving the vacuum suction device 120, and a dust collector 140 for collecting foreign matter in the air sucked by the suction nozzle 130. ).

The main body 110 may be formed in a flat cylindrical shape, as illustrated, the outer peripheral surface of the main body 110, a sensor (not shown) for sensing the distance to the wall or obstacles in the room and the bumper to absorb the impact during the collision (Not shown) may be provided.

In addition, an operation button 118 for operating the operation of the robot cleaner 100 and a display unit 115 for displaying an operation state of the robot cleaner 100 and the like are formed on the upper side of the main body 110. The central part is provided with an exhaust cover 114 covering an exhaust filter (not shown) through which the sucked air is discharged.

On the other hand, the control unit 180 for controlling the driving of the robot cleaner 100 and the battery 190 for supplying power to the robot cleaner 100 are mounted inside the main body 110, and behind the battery 190. A vacuum suction device 120 for generating a suction force is located, and a dust collector mounting part 141 on which the dust collector 140 is mounted is located at the rear of the vacuum suction device 120.

In addition, the dust collector 140 may be detachably mounted to the dust collector mounting unit 141 located at the rear of the main body 110, and the robot cleaner 100 may be moved to both lower sides of the main body 110, respectively. Left and right wheels (150, 160) are provided, and each of the wheels (150, 160) is rotated by connecting the left wheel motor 151 and the right wheel motor (161) operated by the controller 180, respectively. Will move.

Therefore, the robot cleaner 100 moves according to the driving of the left wheel motor 151 and the right wheel motor 161 to perform cleaning in a predetermined cleaning area.

In addition, handles 165 are provided on both side surfaces of the wheels 150 and 160 to facilitate the user's grip, and at least one auxiliary wheel 170 is provided on the bottom surface of the body 110 to provide a robot cleaner. Minimize the friction between the 100 and the bottom surface to facilitate the movement of the robot cleaner (100).

When the robot cleaner 100 configured as described above first selects a cleaning mode of the robot cleaner 100 by pressing the operation button 118 of the user, the controller 180 controls the robot cleaner 100 according to an input program. ). That is, the controller 180 drives the vacuum suction device 120 to allow the air to be sucked through the suction nozzle 130 to collect the foreign matter from the dust collecting device 140, and to operate the left / right motors 151 and 161. By driving, the robot cleaner 100 moves along a predetermined route to be cleaned.

The robot cleaner 100 illustrated in FIGS. 1 to 3 is an example in which the vacuum suction device 120 is designed to be inclined as in the related art, and employs a vacuum suction device according to the present invention described below. In this case, since the vacuum suction device may be implemented in a slimmer structure, the vacuum suction device 120 may be disposed in the vertical direction. As a result, the filters disposed on the inlet and outlet sides of the vacuum suction device can be disposed using the space generated by the slimming of the driving motor, thereby making the entire robot cleaner slim.

Such a robot cleaner 100 can be made compact by slimming and minimizing the size of the vacuum suction device 120.

4A to 4C are a perspective view, a cross-sectional view, and a combined perspective view for explaining a vacuum suction device of a robot cleaner using a BLDC motor according to a preferred embodiment of the present invention.

4A to 4C, the vacuum suction device 120 of the robot cleaner according to the present invention includes a control PCB in which a control circuit elements for applying a driving current to the stator of the motor are mounted in the PCB cover 61. 60 is coupled, and the stator 30 of the BLDC motor 1 is coupled on one side, for example, the upper side, of the control PCB 60.

In addition, the position between the outer circumferential surface of the stator 30 and the inner circumferential surface of the rotor 20 is positioned and coupled to the control PCB 60, the rotation shaft 10 in the central portion of the center frame 23 of the rotor 20 Is combined.

The control PCB 60 not only fixes and supports the stator 30 to be assembled, but also applies a voltage charged in the battery 190 to the BLDC motor 1 as a driving voltage. Therefore, the robot cleaner 100 according to the present invention corresponds to a wireless type.

Here, the rotation shaft 10 is inserted between the center frame 23 of the rotor 20, the center frame 23 and the rotation shaft 10 is fixed by the rotor bushing 24, so that the rotor 20 rotates The rotating shaft 10 rotates by this.

In addition, the fan guide 50 is located above the rotor bushing 24 and has a plurality of guide grooves 51 for guiding the sucked air, and includes a plurality of fan connecting rods 52, for example, four fan connecting rods. It is fixedly supported by 52. Each of the fan connecting rods 52 is coupled to and fixed to a coupling hole 61a provided in the PCB cover 61. That is, as the four fan connecting rods 52 are fixed to the PCB cover 61, the fan guide 50 is fixed.

Each of the plurality of guide grooves 51 of the fan guide 50 proceeds spirally along the circumferential direction to the outer circumferential portion of the fan guide 50 facing the cover 70 and gradually progresses in width from the upper side to the lower side. As it is made of a spiral to have a structure in which the groove is expanded. The air passing through the guide groove 51 moves through the suction hole 51a to the inside of the motor 1 to form the rotor 20, the stator 30, and the control PCB 60 constituting the motor 1. It has a path that is discharged through the space between the fan connecting rods 52 while cooling circuit elements such as a drive transistor mounted on the upper surface of the air connecting method.

The impeller 40 disposed on the upper part of the fan guide 50 is disposed in parallel with a reduced upper plate 40c protruding from the upper side of the fan guide 50b and a predetermined interval with the upper plate 40c. A plurality of guide vanes 40a which are arranged in the form of a spiral partition between the upper and lower plates 40d and the upper plate and the lower plate to form an air flow path for guiding the air sucked into the inlet 40b to the circumferential portion. consist of.

The impeller 40 has a central axis of the lower plate 40d of the impeller 40, a pair of impeller washers 41 and the impeller bushing 42 for engagement with the rotor 20 (that is, power transmission). 10) This is fixed fixed. In addition, the upper part of the impeller bushing (42) prevents the separation of the impeller bushing 42 and the pair of impeller washers 41, and fixed to further strengthen the coupling force of the rotary shaft 10, the impeller 40 and the rotor 20 The nut 43 is screwed in.

Therefore, as the impeller 40 tightens the fixing nut 43, the impeller bushing 42 presses and supports a pair of impeller washers 41 having a large contact area in the center of the lower plate of the impeller 40. ) Is tightly fixed to the rotor bushing 24, and as a result, the impeller 40 is rotated without sliding during the rotation of the rotor 20, the rotational force of the rotor 20 is effectively transmitted to the impeller 40.

In addition, the cover 70 is formed on the upper portion of the impeller 40 while protecting the internal configuration of the vacuum suction device 120, the lower side of the cover 70 is provided on the outer circumference of the pen guide 50 It is positioned and fixed to the coupling jaw (53). The central portion of the cover 70 is formed with a circular inlet port 71 through which air is introduced, and an inner circumferential part thereof extends into the inlet port 40b of the impeller 40 to suck in the outside air of the impeller 40. The lower end of the cylindrical portion which is guided to the suction port 40b and formed at regular intervals with the outer circumferential portion of the impeller 40 passes a path through which the introduced air discharged from the impeller 40 is guided to the guide groove 51 of the fan guide 50 ( It forms the outer wall of PW).

On the other hand, the rotating shaft 10 is rotatably supported by the 1st and 2nd bearings 81 and 82 provided in the 1st and 2nd position with a predetermined space | interval.

The first bearing 81 is inserted into a bearing accommodation groove formed in the bushing 36a disposed inside the stator 30, and the second bearing 82 is embedded in a bearing accommodation groove provided in the PCB cover 61. The bushing 36a may be provided together when molded in the insert molding method of the stator 30 and the PCB cover 61. In addition, a snap ring 83 for preventing separation of the second bearing 82 is snapped to the lower portion of the rotary shaft 10.

In the vacuum suction device 120 of the robot cleaner using the BLDC motor of the present invention configured as described above, a driving voltage is applied to the BLDC motor 1 so that the impeller 40 rotates at high speed according to the rotation of the rotor 20. When the air is present in the impeller 40 by the action of the plurality of guide vanes 40a spirally disposed inside the impeller 40, the suction hole may be formed along the guide groove 51 of the fan guide 50. Strong negative pressure is generated while being discharged to the lower side, that is, inside the motor 1 through 51a).

When such a strong negative pressure is generated, the outside air is sucked through the inlet port 71 of the cover 70 and moved along the guide groove 51 of the fan guide 50 through the impeller 40, and the motor 1. The air sucked into the air flows into the discharge space between the fan connecting rods 52 of the fan guide 50.

At this time, the foreign matter contained in the air sucked by the strong vacuum suction force generated by the vacuum suction device 120 is collected in the dust collector 140, the air from which the foreign matter is removed again to the outside through the exhaust cover 114 Discharged.

As described above, in the vacuum suction device using the BLDC motor of the present invention, the outside air is rotated by the impeller 40 and the guide grooves of the suction port 71, the impeller 40, and the fan guide 50 of the cover 70 ( 51), the frictional resistance element was minimized by setting the shortest path PW of the shortest distance leading to the discharge space between the motor 1 and the fan connecting rod 52 so as to have a natural air flow path.

In addition, the plurality of guide grooves 51 of the fan guide 50 are gradually widened in width and depth as they progress in a circumferential direction in the outer circumferential portion of the fan guide 50 facing each other with the cover 70. Since the impeller 40 rotates at a high speed so that the high pressure air is supplied to the guide groove 51, the guide groove 51 and the suction hole 51a are formed like a spray nozzle. To accelerate the flow of air.

Then, the accelerated air flow passing through the guide groove 51 moves inside the motor 1 to form the rotor 20 and the stator 30 constituting the motor 1 and the upper surface of the control PCB 60. It has a path discharged through the space between the fan connecting rods 52 while cooling circuit elements such as a power drive transistor mounted in the air cooling method.

Furthermore, in the vacuum suction device 120 using the BLDC motor of the present invention, while the rotational force of the rotor 20 is effectively transmitted to the impeller 40, the path is accelerated through the passage path PW having a short and low frictional resistance. Since the air flow cools the inside of the motor 1, the suction efficiency is greatly increased as compared with the conventional one, and thus the power consumption is reduced. As a result, the amount of heat generated by the power driving element is reduced, so that a separate heat dissipation means (for example, Al heat dissipation) is used. Cooling without fins).

Therefore, the vacuum suction device 120 of the present invention is not required to employ a bulky, Al-heat-dissipating structure for increasing the weight required for cooling the power driving device as in the prior art, and thus, the fan guide 50 and the control PCB. It became possible to design the built-in type which positions the BLDC motor 1 in the space between 60.

As a result, in the present invention, the length of the vacuum suction device 120 can be made slimmer by the reduced height (length) of the BLDC motor 1, that is, about 40%, compared to the conventional structure in which the BLDC motor is designed externally. Since the robot cleaner 100 may be disposed vertically in the robot cleaner 100, the robot cleaner 100 may be made slimmer and compact.

5 is a cross-sectional view for explaining a BLDC motor of the vacuum suction apparatus according to the first embodiment of the present invention.

Referring to FIG. 5, the rotor shaft 20 of the BLDC motor 1 is inserted into the through hole of the rotor bushing 24 provided in the center of the center frame 23 and is fixedly supported.

A plurality of, for example, four magnets (two N-poles and two S-poles) 21 are bonded to the inner circumference of the cylindrical yoke frame 22 that is bent and extended at right angles from the center frame 23. It is fixed, and each magnet 21 is bonded to face in the direction of the stator 30.

On the other hand, the stator 30 is of a reduction type using a bulk molding compound (BMC) after the coil 35 is wound in a state in which the bobbin 32 is coupled to the core 31 having a 'T'-shaped cross section. The stator supports, i.e. bushings 36a and 36b, are formed by insert molding to achieve a shape. At this time, the bearing receiving groove is formed in the region corresponding to the first position of the first bushing 36a at the time of insert molding of the stator 30.

6A and 6B are cross-sectional views illustrating an integrated core and an integrated core assembly according to an embodiment of the present invention.

6A and 6B, the integral core 31a according to the present invention includes, for example, six 'T' or '' s from the cylindrical portion 37 which is entirely reduced and the reduced cylindrical portion 37. I 'type teeth 38 extend radially and have six slots. An insulating bobbin 32a is formed in an insert molding method on the outer circumferential portion of the tooth 38. When the coil 35 is wound around the outer circumference of the bobbin, an integral core assembly 33a is formed.

Thereafter, the integrated core assembly 33a is molded by insert molding so that the bushing 36a is provided to form the stator 30.

7A and 7B are cross-sectional views illustrating a split core and a split core assembly according to a modified embodiment of the present invention.

7A and 7B, a split core according to the present invention generally includes a plurality of split cores 31b having an approximately 'T' or 'I' shape, for example, six are combined to form a stator 30. Form.

Each of the split cores 31b is equally divided to include the 'T' or 'I' type teeth 38a, respectively, of the integral core 31a shown in FIG. 6A.

The split core assembly 33b is formed by winding the coil 35 in a state in which the insulating bobbin 32b is coupled to the insert molding method in each of the split cores 31b. As such, when winding the coil 35 using the split core 31b, a coil winding may be made by using an inexpensive general-purpose winding machine, thereby increasing productivity when compared to winding the coil using an integrated core.

Then, for example, the inner circumferential portion 37a of the six split core assemblies 33b, that is, the side surfaces of the inner circumferential portions 37a of the neighboring split core assemblies 33b are welded and bonded, and a bearing accommodation groove is provided. The stator 30 is formed by integrally forming the bushing as much as possible.

On the other hand, when molding the integral core assembly 33a and the split core assembly 33b by insert molding, fixing hooks for fixing the stator 30 to the control PCB 60 while providing a bearing receiving groove. Is injection molded integrally. Therefore, since the stator 30 can be fixed to the control PCB 60 using the fixing hook, the assembly productivity of the BLDC motor 1 can be improved.

On the other hand, in order to match the concentricity of the first and second bearings 81 and 82, it is required to arrange the bearing receiving grooves formed in the first and second positions in the set position. However, when the bushing 36a of the stator 30 is formed by insert molding, the tolerance for the installation position of the bearing accommodation groove into which the first bearing 81 is inserted is 1/100 or less. There is difficulty because it requires. Therefore, in order to enable the use of cheaper molds instead of expensive precision molds, it is desirable to make the tolerance larger than 1/100, for example.

To this end, in the present invention, when the bushing 36a of the stator 30 is formed, a plurality of semicircular protrusions 90 are formed in the inner circumference of the bearing accommodation groove as shown in FIG. 8. In this way, if a plurality of projections 90 are formed on the outer surface of the bearing accommodation groove, and the bearing housing is inserted into the inner circumference of the bearing accommodation groove, the tolerance of the mold can be lowered.

In addition, when injection molding the PCB cover 70 in which the second bearing 82 is located, the protrusion 90 is formed on the outer surface of the bearing accommodation groove provided in the center portion to satisfy the required tolerance. It is preferable. As a result, the tolerance of the mold can be designed to be larger than 1/100, thereby reducing the manufacturing cost.

9 is a cross-sectional view for explaining the rotor structure of the BLDC motor according to the present invention.

Referring to FIG. 9, the rotor 20 is bent and extended from the center frame 23 and the center frame 23 in which a center space 25 in which the rotating shaft 10 is coupled to the center portion is provided, and is generally reduced. The yoke frame 22, the magnet 21 bonded to the inner circumferential surface of the yoke frame 22, and the rotating shaft 10 positioned at the center of the center frame 23 and coupled to the center space 25 are provided. The rotor bushing 24 is fixedly supported.

In this case, the yoke frame 22 is preferably formed of a metal material capable of forming a path.

In addition, the center frame 23 is provided with a plurality of through-holes for dissipating heat generated by the BLDC motor 1 in an air-cooled manner, which is generated in the stator 30 by rotating the rotor 10. It can induce a flow of air to dissipate heat.

Meanwhile, the magnet 21 of the rotor 20 may alternately magnetize the N pole and the S pole to one annular magnetic body adhered to the inside of the yoke frame 22, or may use a split magnet.

In addition, the rotor bushing 24 fixedly supporting the rotor 20 to the rotary shaft 10 may be combined with the center frame 23 and the insert molding method after manufacturing separately.

10 is a partial cutaway cross-sectional view for describing a vacuum suction device of the robot cleaner according to the second embodiment of the present invention.

The vacuum suction device 120 according to the first embodiment shown in FIGS. 4A to 4C is a built-in type in which the BLDC motor 1 is located in the fan guide 50, and the size of the vacuum suction device 120 is compact. Designed model. The vacuum suction device 1200 according to the second embodiment shown in FIG. 10 is an external type in which the BLDC motor 5 is located in an external space of the fan guide 500, and separately manufactures the BLDC motor 5 to vacuum the suction device. The assembly productivity can be improved by employing the structure to be bonded to the 120.

Accordingly, the vacuum suction device 1200 of the second embodiment shown in FIG. 10 is not provided with a PCB cover 700, and the stator 300 is coupled to the bottom of the control PCB 600 through the hook 340. In addition, the stator 300 is integrally molded with the stator support 390 to which the rotating shaft 10 is coupled, and is fixedly supported.

The second bearing 820 may be inserted into the lower portion of the stator support 390, and a bearing accommodation groove 360b having a protrusion 90 (see FIG. 8) is formed on an inner circumferential surface thereof.

In addition, a first bearing 810 supporting the rotating shaft 10 is inserted and inserted into a central portion of the fan guide 500, and a bearing accommodation groove 360a in which the protrusion 90 is formed is provided.

Meanwhile, the fan connecting rod 520 of the fan guide 500 is fixed by a fixing bolt 440 coupled through a fixing hole provided on the control PCB 600 to fix and support the fan guide 500. The groove 510 induces the flow of air to be sucked.

In addition, the stator 300 is positioned to maintain the gap between the outer peripheral surface and the inner peripheral surface of the rotor 200 is hooked on the control PCB 600, the rotor 200 is a rotor bushing ( It is coupled to the rotating shaft 10 through the 240 is fixed.

The control PCB 600 not only fixes and supports the stator 300 to be assembled, but also applies the voltage charged in the battery 190 (see FIG. 2) to the BLDC motor 5 as a driving voltage.

Therefore, since the rotating shaft 10 is coupled to the center frame 230 of the rotor 200, the rotating shaft 10 is rotated by rotating the rotor 200 at high speed, and the impeller 400 rotates to suck air. do.

In addition, the impeller 400 which is tightly coupled to the rotary shaft 10 by a pair of impeller bushings 420 and a pair of impeller washers 410 is positioned on the fan guide 500.

The fan guide 500 includes a plurality of spiral guide grooves 510 for guiding suctioned air on the outer circumference thereof and is controlled by a plurality of fan connecting rods 520, for example, four fan connecting rods 520. Bolted through a fixing hole provided in 600.

The impeller 400 has a plurality of guide vanes arranged in a spiral shape as in the first embodiment, and the center of the lower plate is coupled to the rotary shaft 10 by a pair of impeller washers 410 and an impeller bushing 420. It is fixed.

At this time, the lower plate of the impeller 400 is pressed and fixed by a pair of impeller washers 410 and a pair of impeller bushings 420 by tightening the fixing nut 430 screwed to the upper portion of the rotating shaft 10 bearing ( 810 is supported on the housing. Therefore, the coupling force between the rotary shaft 10 and the impeller 400 becomes stronger, so that the impeller 400 can be rotated without sliding during the rotation of the rotor 200.

In addition, the cover 700 is coupled to the upper part of the impeller 400 to form the air flow path while protecting the configuration of the vacuum suction device 120, and the cylindrical lower side of the cover 700 may include a pen guide ( It is fixed to the coupling jaw 530 provided on the outer circumference of the 500.

In addition, the rotation shaft 10 is supported and rotated by the first and second bearings 810 and 820 located in the first and second positions.

Each of the bearings 810 and 820 is inserted into a pair of bearing accommodation grooves 360a and 360b provided in the fan guide 400 and the stator support 390, and the bearing accommodation grooves 360a and 360b are stator supports 390. And the fan guide 500 may be provided.

Therefore, when the driving voltage is applied to the BLDC motor 5 and the impeller 400 is rotated by the rotational force generated by the rotation of the rotor 200, a plurality of guides spirally disposed inside the impeller 400. Due to the action of the vanes, the air inside the impeller 400 is discharged downward along the guide groove 510 of the fan guide 500, that is, the inside of the motor 5, and a strong negative pressure is generated.

When such a strong negative pressure occurs, the outside air flows through the inlet 710 provided in the center of the cover 700 is moved along the guide groove 510 of the fan guide 500 through the impeller 400, the motor (5) The air sucked into the air flows into the discharge space between the fan connecting rod 520 of the fan guide 500 occurs.

In the second embodiment, the structure of the cover 700, the impeller 400, and the fan guide 500 have substantially the same structure as that of the first embodiment. The same is obtained.

However, since the vacuum suction device 1200 of the second embodiment adopts a structure in which the BLDC motor 5 is positioned on the lower portion of the control PCB 600, the BLDC motor 5 is separately manufactured and then assembled to the main body. The assembly is excellent, the productivity can be improved.

In addition, when the BLDC motor 5 generating the suction force is applied to the vacuum suction apparatus 1200 as described above, the suction efficiency can be improved, and as the suction efficiency is improved, power consumption is reduced and cooling is required. Since the amount of heat generated is reduced, the generated heat does not significantly affect the power driving element even if a separate heat dissipation means (for example, heat dissipation fin or heat dissipation housing) is not formed as a heat conductor.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and changes are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended claims.

1 to 3 is a perspective view for explaining the external appearance of the robot cleaner to which the present invention is applied, a schematic internal configuration diagram and a bottom view for schematically explaining the internal configuration of the robot cleaner.

Figures 4a to 4c is a perspective view, a cross-sectional view and a combined perspective view for explaining the vacuum suction device of the robot cleaner using a BLDC motor according to a preferred embodiment of the present invention.

5 is a cross-sectional view illustrating a BLDC motor for a vacuum suction device according to a first embodiment of the present invention.

6A and 6B are cross-sectional views illustrating an integrated core and an integrated core assembly in accordance with an embodiment of the present invention.

7A and 7B are cross-sectional views illustrating a split core and split core assembly in accordance with an embodiment of the present invention.

8 is a view for explaining the structure of a bearing housing according to the present invention.

9 is a cross-sectional view for explaining the rotor of the BLDC motor according to the present invention.

10 is a partial cross-sectional view illustrating a vacuum suction device for a robot cleaner using a BLDC motor according to a second embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1,5: BLDC motor 10: rotating shaft

20,200: rotor 21,210: magnet

22,220: yoke frame 23: center frame

24,240: Rotor bushing 30,300: Stator

31: core 32-32b: bobbin

33-33b: core assembly 34: hook

35 coil 36a, 36b bushing

40,400: Impeller 41,410: Impeller Washer

40a: guide vane 40c: top plate

40d: lower plate 40b, 71: suction port

42420: impeller bushing 43430: nut

50,500: Fan Guide 51,510: Guide Home

51a: Suction hole 52,520: Fan connecting rod

53,530: Coupling Jaw 60,600: Control PCB

61: PCB cover 81,82,810,820: bearing

90: projection 100: robot cleaner

110: main body 120,1200: vacuum suction device

130: suction nozzle 140: dust collector

150, 160: wheels

Claims (4)

A rotor in which a plurality of N-pole and S-pole magnets are alternately arranged on the inner circumferential surface of the yoke frame that is bent and extended from the center frame; A stator disposed inside the rotor and integrally formed through a stator support by separately winding coils in a state where bobbins are coupled to a plurality of split cores, and insert molding of thermosetting resin; A rotating shaft coupled to the central portion of the rotor and rotating through the rotor bushing; BLDC motor for a vacuum suction device, characterized in that it comprises a control PCB for fixing the stator by applying a hook through a hook integrally formed on the stator support and applying a driving voltage to the motor. The method of claim 1, wherein the stator is, Multiple split cores, A plurality of bobbins formed of an insulating material and coupled to an outer circumference of the split core; A coil wound in a space provided by the bobbin, In the insert molding method using a thermosetting resin provided with a hook and a first bearing receiving groove coupled to the control PCB, to form a plurality of split core assembly coiled in the bobbin of the split core to the reduction type A stator support integrated by BLDC motor for a vacuum suction device, characterized in that a plurality of projections are formed to minimize the tolerance of the bearing embedded in the inner peripheral surface of the first bearing receiving groove. The method of claim 1, BLDC motor for vacuum suction device, characterized in that the lower plate of the impeller for vacuum suction device is coupled to the front end of the rotating shaft by a fixing means. The BLDC motor of claim 1, wherein the split core is formed of an 'I' type.

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