KR102255444B1 - Bldc motor and hair dryer using thereof - Google Patents

Abstract

The present invention relates to a BLDC motor and a hair dryer using the same and, more specifically, to a BLDC motor and a hair dryer using the same, wherein the BLDC motor is capable of enabling a silent operation by easily maintaining the rotation balance of an air blowing fan through a structure for minimizing eccentric rotation during the rotation of a rotator while miniaturizing a product. The BLDC motor comprises: a stator (110) including a cylindrical inner core (111), a cylindrical outer core (112) formed outside the inner core (111), and a wire (113) wound between the inner core (111) and the outer core (112) to form a magnetic field in an internal space of the inner core (111) when power is applied to the wire (113); and a rotator (120) including a shaft pin (121) penetrating a center part of the inner core (111), and a magnet (122) provided in a cylindrical shape on the outer circumference surface of the shaft pin (121) and having N and S poles sequentially formed across each other along the circumference of the outer circumference surface of the shaft pin (121). The outer circumference surface of the magnet (122) is placed apart from the inner circumference surface of the inner core (111) by a predetermined distance to enable the rotator (120) to be rotated by the magnetic field of the stator (110).

Description

BLDC MOTOR AND HAIR DRYER USING THEREOF}

The present invention relates to a BLC motor and a hair dryer using the same, and more specifically, by improving the structure of the BLC motor, it is possible to improve the performance and miniaturize the product, and to cool the substrate by using the blowing function of the hair dryer. It relates to a BLC motor and a hair dryer using the same.

In general, BLDC (Brushless DC) motors convert coils into transistors rather than mechanical brushes. Since there is no brush, there is no spark, no risk of gas explosion, and it has a longer life than general DC motors. It is being utilized.

In this regard, in order to solve the problems of the Korean Patent Registration No. 10-1039635 (Patent Document 1), that is, the manufacturing process is complicated and the productivity decreases due to an increase in labor costs, the applicant of the Republic of Korea Patent Registration No. 10-1309689 BLC motors for electric devices such as (Patent Document 2) have been proposed and registered. The BLC motor of Patent Document 2 can eliminate fixing means such as screw screws, and at the same time simplify components and assembly processes, thereby reducing manufacturing cost and assembly cost, as well as improving productivity and price competitiveness.

However, in the case of Patent Documents 1 and 2, since the rotator connected to the blowing fan in common is disposed outside the state core, the inner diameter of the rotator must be at least larger than the outer diameter of the state core, and accordingly, the rotation radius of the rotator with respect to the rotation center axis pin Because of this size, vibration is generated due to fine eccentric rotation when the blowing fan rotates, causing noise, and the amount of air blown is not constant, so quiet rotation is not sufficient.

If such a BLC motor is applied to a hair dryer that has a lot of movement in use, that is, a device is used frequently while shaking the device, it is difficult to maintain the rotational balance of the fan due to irregular movements such as shaking or sudden change of direction when using the product. In addition, since the above drawbacks are aggravated, and a large-sized rotator must be installed in the electrical device, the occupied space increases so that the electrical device product is inevitably larger, and if a product is to be miniaturized, the design is bound to be limited. none.

On the other hand, conventional hair dryers have the characteristic of generating hot wind by heating the heater, and accordingly, the substrate installed around the heater is heated to degrade the product's performance, as well as frequent overheating when an automatic overheating prevention means is applied to the product. Since the prevention sensor is operated to forcibly stop the product, there is a problem that causes inconvenience in use.

Korean Patent Registration No. 10-1039635 Registered Patent Publication Korean Patent Registration No. 10-1309689 Registered Patent Publication

The present invention is to solve the shortcomings of the prior art, and the structure of the BLC motor can be improved to reduce the size while minimizing eccentric rotation during rotation of the rotator, so that the rotational balance of the blowing fan can be easily maintained. Its purpose is to provide a BLC motor capable of movement.

Another object of the present invention is to overheat the substrate while increasing the heating efficiency of the heater through an air circulation structure in which the substrate controlling the hair dryer is cooled using the wind of a blowing fan and the wind used for cooling the substrate is blown back to the heater. It is to provide a hair dryer using a BLC motor that can prevent the problem.

The BLC motor of the present invention for achieving the above object includes a cylindrical inner core, a cylindrical outer core formed outside the inner core, and a wire wound between the inner core and the outer core. A stator in which a magnetic field is formed in the inner space of the inner core when power is applied to the stator; A rotator including a shaft pin penetrating the inner core, and a magnet provided in a cylindrical shape on an outer circumferential surface of the shaft pin and sequentially crossing N poles and S poles along the outer circumferential surface of the shaft pin; It is made of, and the outer peripheral surface of the magnet is disposed a predetermined distance apart from the inner peripheral surface of the inner core, characterized in that the rotator is rotatable by the magnetic field of the stator.

In a preferred embodiment, the inner core is divided into a plurality of pieces on a flat cross section, and the inner circumferential surface of each divided inner core is separated into a distant region and a near region with respect to the outer circumferential surface of the magnet. The center of the outer peripheral surface of each magnet divided into poles may face the center of the near-field area.

In addition, the distant region may be disposed in a direction in which the rotator rotates, and the near region may be disposed in an opposite direction in which the rotator rotates.

In addition, the magnet is divided into a plurality on a flat cross-section, each divided magnet has an N or S pole, and the outer circumferential surface of each magnet is in contact with the inner circumferential surface of the cylindrical magnet housing so that each magnet is fixed to the outer circumferential surface of the shaft pin. I can.

In addition, the stator further includes a core body insulating between the inner and outer cores and the wire, and the BLC motor includes: a substrate fixed to one side of the core body to apply power to the wire; A blowing fan including a fan body fixed to an end of the shaft pin and blades formed on an outer circumferential surface of the fan body; It may further include.

The hair dryer of the present invention for achieving the above object includes a cylindrical motor housing for fixing the BLC motor to the inside, and a heating heater extending from one end of the motor housing toward the blowing direction of the blowing fan and disposed therein. A cylindrical heater housing, a dryer substrate provided around the outer periphery of the heater housing to supply power to the heater, a body cover surrounding the motor housing, the heater housing, and the dryer substrate, and a handle connected to one side of the body cover Including, and characterized in that the wind of the blowing fan can be discharged to the exhaust through the heater.

In a preferred embodiment, the heater housing is provided to gradually decrease in diameter in the blowing direction, and at least one through hole is formed on one side of the heater housing, so that part of the wind of the blowing fan moves outward through the through hole, and the dryer It is possible to make the substrate component of the substrate cool.

In addition, a passage is formed by a predetermined distance between the motor housing outer circumferential surface and the outer circumferential surface of the heater housing and the cover body, and the wind cooling the dryer substrate is discharged backward through the passage in the direction in which the blowing fan is located. You can make it possible.

In addition, a ring-shaped intake cover is provided at the intake side end of the main body cover, and an exhaust hole is formed on the outer edge of the ring of the intake cover to exhaust some of the reverse exhaust wind, and the inner edge of the ring is inclined in the direction of the blowing fan. A flange may be provided so that part of the reverse discharged wind can be inhaled by a blower fan.

In addition, the cover body may be a material having high thermal conductivity.

According to the present invention, the rotator of the BLC motor is disposed inside the stator, so that the size of the BLC motor can be reduced, thereby reducing the space occupied by the product, thereby miniaturizing the product.

In addition, since the rotation radius of the rotator with respect to the shaft pin is greatly reduced, there is little eccentric rotation when rotating the rotator, so it is possible to easily maintain the rotational balance of the blowing fan, thereby reducing noise when rotating the blowing fan and maintaining a constant blowing volume. In particular, it is suitable for application to a hair dryer with a lot of movement due to its characteristics of use.

In addition, the air circulation structure that cools the parts installed on the substrate of the hair dryer using the wind of the blower fan prevents overheating of the substrate to prevent product performance degradation, and is also frequent in the case of products with automatic overheating prevention means. It is possible to increase the satisfaction of consumers by suppressing the phenomenon of forcibly stopping product use.

In addition, since part of the heated wind is supplied to the heater of the hair dryer after cooling the substrate, there is an advantage of improving the heating efficiency of the heater and blowing hot wind in a short time.

1 is a perspective view of a main part assembly of a BLC motor unit according to the present invention.
Figure 2 is an exploded perspective view of the main part of the BLC motor unit according to the present invention.
3 is a longitudinal cross-sectional view of a BLC motor unit according to the present invention.
FIG. 4 is a plan cross-sectional view of a core and a magnet in the plane cross-sectional view taken along line AA of FIG. 3.
5 is a perspective view of a hair dryer using a BLC motor according to the present invention.
Figure 6 is a longitudinal cross-sectional view of the main part of the hair dryer using a BLC motor according to the present invention.

The present invention can be modified in various ways and has various embodiments. Hereinafter, preferred embodiments of the present invention will be illustrated, and the present invention will be described in detail based on this. However, this is not intended to limit the present invention only to the illustrated embodiments, and it is to be understood that the spirit and scope of the present invention includes conventional modifications or equivalents to substitutes of the illustrated forms.

In addition, in the entire specification, the term'connected' to another part includes the case of being'directly connected' or'indirectly connected' with a certain element, and'including' a certain element is a particularly opposite description. Unless there is no other component is not excluded, it means that other components can be added.

1 is an assembled perspective view of the main parts of the BLC motor according to the present invention, FIG. 2 is an exploded perspective view of the main parts of the BLC motor according to the present invention, and FIG. 3 is a longitudinal sectional view of the BLC motor according to the present invention, and FIG. 4 is It is a cross-sectional view of the core and the magnet in the cross-section taken along line AA of FIG. 3.

1 to 4, the BLC motor 100 according to the present invention is particularly suitably provided for application to an electric device such as a hair dryer, and includes a stator 110 and a rotator 120 In addition, a motor substrate 130 electrically connected to the stator 110, a motor bracket 140, and a blower fan 150 may be further included.

The stator 110 includes a cylindrical inner core 111 made of a metal material such as aluminum, a cylindrical outer core 112 made of a metal material and spaced apart from the outside of the inner core 111, and the inner core 111 ) And a copper wire 114 wound several to hundreds of times in the wire winding region 114a between the outer core 112 and the outer core 112. Accordingly, when power is applied to the wire 114, a magnetic field is formed in the inner space of the inner core 111.

Here, a core body 113 made of an insulating material such as synthetic resin is formed at a portion of the outer surfaces of the inner core 111 and the outer core 112 where the wire 114 is wound and contacted, and the core body 113 has a motor Protrusions for being bound or fixed to the substrate 130, the motor bracket 140, or the motor housing 210 to be described later may be formed, and such a binding structure is an arbitrary design, so a detailed structure and description thereof will be omitted. do.

The rotator 120 is provided to be rotatable by a magnetic field in the inner center of the inner core 111, the shaft pin 121 penetrating the inner core 111, and a cylindrical shape on the outer peripheral surface of the shaft pin 121 It is made and includes a magnet 122 in which the N-pole and the S-pole are sequentially intersected along the outer peripheral surface of the shaft pin 121. In the drawing, the magnet 122 has two N-poles and two S-poles intersected with each other, but in the present invention, three or more N-poles and S-poles may be intersected.

Since the outer circumferential surface of the magnet 122 is disposed a predetermined distance apart from the inner circumferential surface of the inner core 111, when a magnetic field is formed in the stator 110, the rotator 120 provided with the magnet 122 is disposed at the inner core 111 ) Can be rotated in the center.

In the case of Patent Documents 1 and 2, it was difficult to maintain a stable balance during rotation of the rotator because two spaces on the inner and outer circumferential surfaces of the stator each require a certain distance from the rotator, but the present invention provides the stator 110 and the rotator 120 ) Since the spaced portion is formed only between the inner circumferential surface of the inner core 111 and the outer circumferential surface of the rotator 120, the entire rotator 120 rotates in the center of the inner core 111 of the stator 110. Maintaining the rotational balance of 120 can be improved.

As shown in FIG. 4, the inner core 111 may be divided into a plurality of pieces (divided into four in the embodiment of the drawing, but can be divided into six or eight or more) on a flat cross-section, and The inner circumferential surface of each inner core 111 may be formed to be separated into a distant region 111b and a short distance region 111a with respect to the outer circumferential surface of the magnet 122. Here, the distant region 111b may be formed by cutting or may be provided during a casting molding process.

The far area 111b may be disposed in a direction in which the rotator 120 rotates, and the near area 111a may be disposed in an opposite direction in which the rotator 120 rotates. Each region ratio of (111a) may be formed from 3:7 to 5:5, but the ratio of each region may be appropriately changed according to the number of divisions of the inner core 111 or the number of N and S poles of the magnet. have.

If the distant region 111b is not formed, since the inner circumferential surface of the inner core 111 is relatively large, a magnetic field is formed in a large area, and when the rotator 120 starts to rotate, the magnet swings back and forth on the inner circumferential surface of the inner core 111 Since the rotation starts, there is a problem that the response speed to the start of rotation is slow.

On the other hand, if the long-distance area 111b is formed on the inner circumferential surface of the inner core 111 as in the present invention, which is relatively far away from the outer circumferential surface of the magnet 122, the magnet 122 is generated by magnetic force when the rotator 120 is stopped. The center of each pole is located in the inner center of the near-field (111a), and when a magnetic field is formed in this state, the magnet 122 immediately moves to the far-field (111b), and the rotation of the rotator 120 is quickly started, resulting in a rotational response. Speed can be improved.

On the other hand, the magnet 122 can be divided into magnetization of the N pole and S pole with respect to the cylindrical magnet,. As shown, the magnets of each pole can be individually manufactured, that is, as shown in FIG. 4, the magnet 122 is divided into a plurality of pieces, and each divided magnet 122 has an N pole or an S pole, In order to fix the magnets 122, the outer circumferential surface of each magnet 122 is in contact with the inner circumferential surface of the cylindrical magnet housing 123 (see Fig. 2), so that each magnet 122 can be fixed to the outer circumferential surface of the shaft pin 121. have. At this time, each of the divided magnets 122 may be fixed between the shaft pin 121 and the magnet housing 123 in a force-fitting manner.

As described above, the stator 110 may further include a core body 113 insulating between the inner and outer cores 111 and 112 and the wire 114, and the BLC motor 100 , A motor substrate 130 fixed to one side of the core body 113 to apply power to the wire 114, and a blowing fan that is fixed to one end of the shaft pin 121 to cause wind by rotating the rotator 120 150 may be included.

The blowing fan 150 includes a fan body 151 fixed to the shaft pin 121 and a plurality of blades 152 formed on the outer circumferential surface of the fan body 151.

A motor bracket 140 may be further provided to fix the BLC motor 100 to an electric device, for example, the hair dryer 200.

In addition, as shown in FIGS. 3 and 6, a bearing 102 is installed between the shaft pin 121 and the motor bracket 140, and between the shaft pin 121 and the motor housing 210, so that frictional force when the shaft pin 121 rotates It can be minimized, and the fan body 151 and the shaft pin 121 are mutually connected by installing a retaining ring 101 fixed in a force-fitting shape between the shaft pin 121 and the fan body 151 of the blowing fan 150. It can be rigidly fixed, it should be understood that these elements can be appropriately modified or deformed as needed.

5 is a perspective view of a hair dryer using a BLC motor according to the present invention, and FIG. 6 is a longitudinal sectional view of a main part of a hair dryer using a BLC motor according to the present invention.

5 and 6, the hair dryer 200 includes a cylindrical motor housing 210 that fixes the BLC motor 100 to the inside, and the blowing fan at one end of the motor housing 210. A cylindrical heater housing 220 extending in the direction of the blowing direction of 150 and having a heating heater 221 disposed therein, and an outer circumference of the heater housing 220 to supply power to at least the heater 221. A dryer substrate 230 to be supplied, a body cover 240 surrounding the outside of the heater housing 220 and the dryer substrate 230, including the motor housing 210, and a handle connected to one side of the body cover 240 Includes 250.

In this case, the wind formed by the rotation of the blowing fan 150 is heated by the heater 221 while passing through the inside of the heater housing 220 and the hot wind is discharged to the exhaust unit 222. In this case, an intake net 211 may be installed on the intake part side of the motor housing 210 to prevent foreign substances from entering through the intake part and to ensure safety.

The heater housing 220 is provided to gradually decrease in diameter in the blowing direction, and at least one through hole 223 may be formed at one side of the heater housing 220. In this case, while the wind generated by the blowing fan 150 flows into the heater housing 220, part of the wind before being heated by the heater 221 moves to the outside of the heater housing 220 through the through hole 223 By doing so, the substrate component 231 of the dryer substrate 230 can be cooled, and accordingly, the overheating of the dryer substrate 230 can be prevented, thereby deteriorating the performance of the device or delaying the sensor operation timing of the overheating prevention means. You can extend the time.

In addition, a passage may be formed on the outer circumferential surface of the motor housing 210 and a portion between the outer circumferential surface of the heater housing 220 and the main body cover 240 by a predetermined distance, and accordingly, the dryer substrate 230 and the substrate The wind cooled by the part 231 may be discharged backward through the passage in the direction in which the blowing fan 150 is located.

In a more preferred embodiment, a ring-shaped inlet cover 260 may be provided at an end of the body cover 240 on the intake side. A plurality of exhaust holes 261 are formed along the ring circumference at the outer edge of the ring of the intake cover 260 to exhaust some of the wind that is discharged back through the passage between the body cover 240 and the motor housing 210 to the outside. In addition, a flange 262 that is gradually inclined toward the blowing fan 150 is formed at the inner edge of the ring of the intake cover 260 so that a part of the reversely discharged wind is sucked back into the blowing fan 150 to allow air to be sucked. Can be circulated.

At this time, if the body cover 240 is made of a metal material having high thermal conductivity, such as aluminum, heat dissipation is quickly achieved, and the temperature of the air inside the body cover 240 can be reduced in a short time, so that the dryer substrate 230 can be efficiently cooled. , Since the reverse exhaust air having a higher temperature than the outside air is circulated back to the blowing fan 150 and reused for heating the heater 221, the rate of increase in the heating temperature of the heater 221 may be improved.

Although the above description has been described as a limited embodiment showing the technical idea of the present invention, the present invention is not limited to a specific embodiment, shape and numerical value, and some of the constituent elements of the embodiments are changed, mixed, etc. Various modifications and variations can be implemented by those of ordinary skill in the technical field to which the present invention pertains without departing, and such modifications and variations should not be individually understood from the technical spirit or prospect of the present invention.

100... BLC motor
101... retaining ring 102... bearing
110... stator 111... inner core
111a... near area 111b... far area
112... outer core 113... core body
114... wire 114a... wire winding area
120...rotator 121...shaft pin
122... magnet 123... magnet housing
130... Motor board 140... Motor bracket
150...blowing fan 151...fan body 152...wing
200... hair dryer
210... Motor housing 211... Intake mesh
220...heater housing 221...heater
222... exhaust part 223... through hole
230... dryer board 231... board components
240... main body cover 250... handle
260... Intake cover 261... Exhaust hole 262... Flange

Claims (10)

delete delete delete delete delete Including a cylindrical inner core, a cylindrical outer core formed outside the inner core, a wire wound between the inner core and the outer core, and a core body insulating between the inner and outer cores and the wires. A stator in which a magnetic field is formed in the inner space of the inner core when power is applied to the wire; A rotator including a shaft pin penetrating the center of the inner core, and a magnet provided in a cylindrical shape on an outer circumferential surface of the shaft pin and sequentially intersecting N poles and S poles along the outer circumferential surface of the shaft pin; A motor substrate fixed to one side of the core body to apply power to the wire; A blowing fan including a fan body fixed to an end of the shaft pin and blades formed on an outer peripheral surface of the fan body; A hair dryer using a BLC motor in which the outer circumferential surface of the magnet is disposed a predetermined distance apart from the inner circumferential surface of the inner core so that the rotator is rotatable by the magnetic field of the stator,
A cylindrical motor housing for fixing the BLC motor to the inside; A cylindrical heater housing extending from one end of the motor housing toward the blowing direction of the blowing fan and having a heating heater disposed therein; A dryer substrate provided around the outer periphery of the heater housing to supply power to the heater; A body cover surrounding the motor housing, the heater housing, and the dryer substrate; A handle connected to one side of the main body cover; Consisting of, but allowing the wind of the blowing fan to be discharged to the exhaust through the heater,
The heater housing is provided to gradually decrease in diameter in the blowing direction, and at least one through hole is formed at one side of the heater housing so that a part of the wind of the blowing fan moves outward through the through hole, thereby removing the substrate component of the dryer substrate. It is provided to be cooled, and a passage is formed by a predetermined distance between the outer circumferential surface of the motor housing and the outer circumferential surface of the heater housing and the body cover to cool the dryer substrate through the passage to which the blowing fan is located. Hair dryer, characterized in that the reverse discharge is possible in the direction. delete delete The method of claim 6,
A ring-shaped intake cover is provided at an end of the intake side of the main body cover, and an exhaust hole is formed on the outer edge of the ring of the intake cover to exhaust some of the reverse exhaust wind, and a flange inclined in the direction of the blowing fan at the inner edge of the ring A hair dryer, characterized in that it is provided so that a part of the reverse discharged wind can be inhaled by a blower fan. delete

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