KR100616614B1 - electric motor - Google Patents

Abstract

The present invention relates to an electric motor having a bearing portion for supporting rotation while connecting between the rotor and the stator in a gap formed between the rotor and the stator.

The present invention includes a stator having a fixed base having a core having at least one tooth wound around a coil extending in an outer circumferential direction, and assembled to a central hole of the core, and having a terminal portion for applying power to the coil side; It is disposed in the outer space of the stator has a ring-shaped magnet in which the magnetic poles of the N, S poles are alternately magnetized in the circumferential direction, and the guide support portion surrounding the outer peripheral end of the stator is formed in the magnet so that the magnet is not separated And a bearing unit for supporting the rotation of the rotor by forming a plurality of dynamic pressure generating grooves on either the rotor and the outer end of the tooth and the inner circumferential surface of the magnet.

According to the present invention, it is possible to reduce the components to simplify the assembly structure, to reduce the overall volume to enable a compact design, and to reduce the magnetoresistance to increase the drive torque efficiency.

Stator, Rotor, Coil, Yoke, Magnet, Dynamic Groove, Bearing, Teeth

Description

Electric motor             

1 is a cross-sectional view showing a typical outer rotor type motor.

2 is a cross-sectional view showing a general coreless motor.

3 is a cross-sectional view showing a first embodiment of the electric motor according to the present invention.

4 is a state diagram provided with a thrust bearing in the first embodiment of the electric motor according to the present invention.

5 is a cross-sectional view showing a second embodiment of the electric motor according to the present invention.

6 is a state diagram provided with a thrust bearing in a second embodiment of the electric motor according to the present invention.

7 is a cross-sectional view showing a third embodiment of the electric motor according to the present invention.

Explanation of symbols on the main parts of the drawings

110,210,310: Stator 111,211: Core

112,212,312: Coil 113: Teeth

115,215: Fixed base 120,220,320: Rotor

121,221,321: Magnet 122,222: Guide support

322: shaft 130, 230, 340: bearing

 131,231,341: Dynamic pressure generating groove S: Slot space

The present invention is provided with a bearing portion that supports rotation while connecting between the rotor and the stator in the gap formed between the rotor and the stator to reduce the components to simplify the assembly structure, to reduce the overall volume to enable a compact design, magnetoresistance It relates to an electric motor that can increase the drive torque efficiency by reducing the.

In general, an electric motor (hereinafter, referred to as a motor) is a device that converts electrical energy into mechanical energy, which is applied to the type of power supply, type of starting method, type of rotor, frame, bracket, etc. They are classified in various ways, and they are all subdivided by insulation method, bearing method, output, rotation speed, voltage and frequency.

Among these various motors, DC and AC motors are classified according to the type of power supplied. The DC motors are mechanically contacted with a brush DC motor and a brush according to the presence or absence of a brush provided to alternately supply current. Without a brushless dc motor.

In addition, the brushless motor is classified according to the presence or absence of the stator core. In general, the brushless motor has a core (or radial type) and coreless type (or radial type) having a cup (cylindrical) structure (or It is classified as axial type.

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

1 is a cross-sectional view of a typical outer rotor type motor, wherein the outer rotor type motor 1 includes a stator 1a having a core 12 on which at least one coil 11 is wound, as shown. The bearing member (1b) with which the magnet (14) corresponding to the coil (11) is mounted on the inner peripheral surface of the lower end of the casing (15) and the rotor (1b) can be rotated with respect to the stator (1a). It consists of an axis system part 1c which consists of the shaft 16 which has 17).

The stator 1a is provided on a base plate 18 on which a pattern circuit is formed to supply external power to the coil 11, and the casing 15 is integrally connected to an upper end of the shaft 16. The bearing member 17 is assembled to a core housing 13 in which a plurality of cores 12 are mounted, and a lower portion of the core housing 13 is sealed by a cap 19.

Accordingly, when the power supply to the coil 11 side is supplied, the rotor 1b is rotated in one direction by the shaft 16 by the interaction between the electric field of the coil 11 and the magnetic field of the magnet 14. It is possible to obtain a rotational driving force to be rotated.

FIG. 2 is a cross-sectional view of a general coreless motor, in which the coreless motor 2 includes a stator 2a having at least one coil 21 on a base plate 28, as shown. The upper and lower bearing members 27a allow one-way rotation of the rotor 2b with respect to the rotor 2b and the stator 2a in which the magnets 24 and the magnets 24 corresponding to the coils 21 are mounted on the shaft 26. It consists of an axis system part 2c which consists of the shaft 26 which has (b) 27b.

The stator 2a and the rotor 2b are accommodated in the inner space of the upper and lower casings 25a and 25b that are vertically coupled together, and the upper and lower casings 25a and 25b rotate the shaft 26. Supporting upper and lower bearing members 27a and 27b are accommodated, respectively.

Accordingly, when power is supplied through the terminal portion 29 connected to the base plate 28, the rotor 2b is formed by the interaction between the electric field of the coil 21 and the magnetic field of the magnet 24. The rotational driving force rotated in one direction can be obtained with the center of rotation.

On the other hand, single components used in high-tech communication devices such as mobile phones have recently wanted a product configuration that can realize small size, precision, and high efficiency. Especially, the motor that generates the rotational driving force generates a large torque while the total volume is small. And excellent torque efficiency.

However, in the conventional motor structure shown in FIG. 1, the stator 1a and the rotor 1b may be rotated with the core 12 of the stator 1a to smoothly perform one-way rotational driving without interfering with each other. Since the pores G1 having a predetermined size or more must be formed between the magnets 14 of the rotor 1b, the motor size is reduced to reduce the motor size, and it is difficult to reduce the motor volume. There was a limit to increase torque efficiency by increasing the size of).

Since the shaft 16 having the bearing member 17 mounted on the core housing 13 of the stator 1a must be provided, the number of component parts increases, and the assembly process is complicated and there is a limit in reducing the manufacturing cost.

In addition, in the conventional motor conventional structure shown in FIG. 2, since the gap G2 is formed by the space in which the upper and lower bearing members 27a and 27b are accommodated in the upper and lower casings 25a and 25b, There was a problem that it is difficult to reduce the motor size or reduce the motor volume by reducing the height of the motor.

Assembling the upper and lower bearing members 27a and 27b on the shaft 26 is very cumbersome, and the number of component parts increases, which limits the manufacturing cost.

 Therefore, the present invention has been proposed in order to solve the conventional problems as described above, the object of which is to simplify the assembly structure of the motor consisting of the stator and the rotor to further miniaturize the motor size, reduce the number of components to reduce the assembly process To provide an electric motor that can be easily performed.

In addition, another object of the present invention is to provide an electric motor that can increase the driving torque efficiency by reducing the magnetic resistance to the maximum.

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

A stator having a core having at least one tooth wound around a coil extending in an outer circumferential direction, the stator having a fixed base which is assembled in a center hole of the core and has a terminal portion for applying power to the coil side;

It is disposed in the outer space of the stator has a ring-shaped magnet in which the magnetic poles of the N, S poles are alternately magnetized in the circumferential direction, and the guide support portion surrounding the outer peripheral end of the stator is formed in the magnet so that the magnet is not separated Rotor and

It provides an electric motor comprising a; bearing portion for supporting the rotation of the rotor by forming a plurality of grooves for generating dynamic pressure on any one of the outer end of the tooth and the inner peripheral surface of the magnet.

Preferably, the guide support is composed of a fixed guide support jaw configured integrally with any one of the upper and lower surfaces of the magnet, and a detachable guide support jaw detachably assembled to any one of the upper and lower surfaces of the magnet. do.

Preferably, the dynamic pressure generating groove is formed on the inner peripheral surface of the magnet corresponding to the outer end of the tooth to generate a radial dynamic pressure between the tooth and the magnet.

Preferably, another dynamic pressure generating groove is formed in the inner surface of the guide support corresponding to the upper and lower surfaces of the outer end of the tooth to generate a thrust dynamic pressure between the tooth and the guide support.

More preferably, the inner surface of the guide support is provided with a thrust bearing.

Preferably, the non-magnetic resin is filled in the slot space formed between the tooth and another adjacent tooth.

In addition, the present invention,

A stator having a core having at least one tooth wound around the coil extending in an inner circumferential direction, the stator having a fixed base on which the core is mounted and a terminal portion for applying power to the coil side;

The guide support portion is disposed in the inner space of the stator and has an annular magnet in which magnetic poles of the N and S poles are alternately magnetized in the circumferential direction, and a guide support portion surrounding the inner circumferential end of the stator is formed in the magnet so that the magnet is not separated. Rotor; And

It provides an electric motor comprising a; bearing portion for supporting the rotation of the rotor by forming a plurality of grooves for generating a dynamic pressure on any one of the inner end of the tooth and the outer peripheral surface of the magnet.

Preferably, the guide support comprises a fixed guide support jaw integrally provided on any one of the upper and lower surfaces of the magnet, and a detachable guide support jaw detachably assembled to any one of the upper and lower surfaces of the magnet. do.

Preferably, the dynamic pressure generating groove is formed on the outer circumferential surface of the magnet corresponding to the inner end of the tooth to generate a radial dynamic pressure between the tooth and the magnet.

Preferably, another dynamic pressure generating groove is formed in the inner surface of the guide support portion corresponding to the upper and lower surfaces of the inner end of the tooth so as to generate a thrust dynamic pressure between the tooth and the guide support.

More preferably, the inner surface of the guide support is provided with a thrust bearing.

Preferably, the non-magnetic resin is filled in the slot space formed between the tooth and another adjacent tooth.

In addition, the present invention,

A stator having at least one coil on a base plate, the stator having a terminal portion for supplying power to the coil;

A rotor mounted with a shaft at a center of the cylindrical magnet corresponding to the coil;

A casing having an inner space in which the stator and the rotor are accommodated; and

And a plurality of dynamic pressure generating grooves formed on any one of an outer surface of the magnet and an inner surface of the casing to support rotation of the rotor in the casing.

Preferably, the dynamic pressure generating groove is formed on the outer peripheral surface of the magnet to generate a radial dynamic pressure between the outer peripheral surface of the magnet and the vertical inner surface of the casing.

More preferably, a plurality of further dynamic pressure generating grooves are formed on the upper surface of the magnet to generate thrust dynamic pressure between the horizontal inner circumferential surface of the upper casing.

Preferably, the casing is composed of an upper casing surrounding the stator and the rotor, and a lower casing sealing the open lower roll of the upper casing.

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

Figure 3 is a cross-sectional view showing a first embodiment of the electric motor according to the present invention, the motor 100 of the present invention, as shown, by replacing the bearing structure connecting between the fixed structure and the rotating structure by fluid dynamic pressure To simplify the motor structure, such a motor 100 is an outer rotor-type motor member composed of a stator 110, a rotor 120, and a bearing unit 130.

That is, the stator 110 is composed of a core 111 and a fixed base 115 is a fixed structure disposed inside the rotor 120, the core 111 has at least one tooth 113 body It extends in the outer circumferential direction from the center, and forms a through-hole central hole 111a in the center of the body, and wound the coil 112 to which power is applied from the outside to the tooth 113.

The teeth 113 are disposed at the same angle in the circumferential direction, and form a slot space S between adjacent teeth 113.

In addition, the fixed base 115 is inserted into the central hole 111a of the core 111 to be integrally assembled, and has a terminal portion 116 for supplying power to the coil 112 side.

The rotor 120 is a rotating structure rotatably disposed in an outer space of the core 111 constituting the stator 110, and an annular ring type in which magnetic poles of N and S poles are alternately magnetized in the circumferential direction. The magnet 121 is provided and configured.

Upper and lower surfaces of the magnet 121 are provided with guide support portions 122 surrounding the outer circumferential end of the stator 110 so that the magnet 121 is separated from the core 111 and separated.

As shown in FIG. 3, the guide support 122 is integrally formed with a detachable guide support jaw 122a that is detachably assembled to an upper surface of the magnet 121 and a lower surface of the magnet 121. It is composed of a fixed guide support jaw (122b) is configured to surround the teeth outer end of the stator.

In addition, the guide support 122 is provided with a fixed guide support jaw 122b on the upper surface of the magnet 121 and a separate guide support jaw 122a on the lower surface of the magnet 121, respectively, as opposed to the above. The separate guide support jaw 122a may be provided on the upper and lower surfaces of the magnet 121, respectively.

 On the other hand, the bearing portion 130 for supporting the rotation of the rotor 120 with the central axis (Y) of the stator 110 as the center of rotation is not in contact with the magnet 121 and the tooth 113 A plurality of dynamic pressure generating grooves 131 are formed in any one of an outer end of the tooth 113 and an inner circumferential surface of the magnet 121 so that the one-way rotation of the rotor 120 can be smoothly performed. do.

Here, the dynamic pressure generating groove 131 is formed in a herringbone or spiral shape.

The dynamic pressure generating groove 131 is formed on the inner circumferential surface of the magnet 121 so that radial dynamic pressure is generated between the tooth 113 and the magnet 121.

In addition, in order to generate a thrust dynamic pressure between the tooth 113 and the guide support 122, another dynamic pressure is applied to the inner surface of the guide support 122 corresponding to the upper and lower surfaces of the outer end of the tooth 113. A plurality of generating grooves 131a may be formed.

As shown in FIG. 4, a thrust bearing surface is formed between the tooth 113 and the guide support 122 on the inner surface of the guide support 122 corresponding to the upper and lower surfaces of the outer end of the tooth 113. The thrust bearing 124 may be attached to form.

In addition, the non-magnetic resin is preferably filled in the slot space S formed between the teeth 113 and another tooth 113 adjacent thereto so as to minimize magnetic flux loss.

On the other hand, Figure 5 is a cross-sectional view showing a second embodiment of the electric motor according to the present invention, the motor 200 of the present invention as described above by replacing the bearing structure connecting the fixed structure and the rotating structure with fluid dynamic pressure To simplify the motor structure, such a motor 200 is an inner rotor type motor member composed of a stator 210, a rotor 220, and a bearing portion 230.

That is, the stator 210 is composed of a core 211 and the fixed base 215 is a fixed structure disposed on the outside of the rotor 220, the core 211 is at least one tooth 213 ring It extends in the circumferential direction from the annular body, the teeth 213 are arranged at the same angle in the circumferential direction, and forms a slot space (S ') between the adjacent teeth 213, the teeth 213 Each of the coils 212 to which the power is applied from the outside is wound.

In addition, the fixed base 215 is provided with a terminal portion 216 for supplying power to the coil 212 side of the stator 210.

The rotor 220 is a rotating structure rotatably disposed in the inner space of the core 211 constituting the stator 210, and an annular ring type in which magnetic poles of N and S poles are alternately magnetized in the circumferential direction. It is composed of a magnet 221.

On the upper and lower surfaces of the magnet 221, a guide support part 222 is formed to surround the inner circumferential end of the stator 210 so that the magnet 221 is separated from the core 211 so as not to be separated.

Here, the guide support 222 is a detachable guide support jaw 222a which is detachably assembled to either of the upper and lower surfaces of the magnet 221 and the magnet 221 as shown in FIG. 5. It is preferable that the fixed guide support jaw (222b) is formed integrally with either one of the upper, lower surfaces of the.

 The bearing part 230 supporting the rotation of the rotor 220 with the central axis Y 'of the stator 210 as the rotation center is in a state where the magnet 221 and the tooth 213 are not in contact with each other. A plurality of dynamic pressure generating grooves 231 are formed in any one of the inner end of the tooth 213 and the outer circumferential surface of the magnet 221 so that the one-way rotation of the rotor 220 can be smoothly performed. .

The dynamic pressure generating grooves 231 are formed in plural on the outer circumferential surface of the magnet 221 such that radial dynamic pressure is generated between the teeth 213 and the magnet 221, and the teeth 213 and the guide support ( In order to generate thrust dynamic pressure between 222, a plurality of additional dynamic pressure generating grooves 231a may be formed on the inner surface of the guide support 222 corresponding to the upper and lower surfaces of the inner end of the tooth 213. .

In addition, a thrust bearing is formed between the tooth 213 and the guide support 222 on the inner surface of the guide support 222 corresponding to the upper and lower surfaces of the tooth 213 as shown in FIG. 6. The thrust bearing 224 may be attached to form a surface.

In addition, a nonmagnetic resin is also filled in the slot space S ′ formed between the teeth 213 and another tooth 213 adjacent thereto so as to minimize magnetic flux loss.

On the other hand, Figure 7 is a cross-sectional view showing a third embodiment of the electric motor according to the present invention, the motor 300 of the present invention, as shown, the bearing structure for connecting between the fixed structure and the rotating structure in fluid dynamic pressure Alternatively, to simplify the motor structure, such a motor 300 is a coreless motor member composed of a stator 310, a rotor 320, a casing 330 and a bearing portion 340.

That is, the stator 310 is a fixed structure having at least one coil 312 on the base plate 311, and the base plate 311 includes a terminal portion 316 for supplying power to the coil side. .

In addition, the rotor 320 is a rotating structure having a cylindrical magnet 321, which is disposed corresponding to the coil 312 of the stator 310, the magnetic poles of the N, S poles alternately magnetized in the circumferential direction, the magnet In the center of the body of 321 is mounted a shaft 322, one end of which is exposed to the outside through the casing 330.

In addition, the casing 330 is an accommodating member having a predetermined size of inner space in which the stator 310 and the rotor 320 are accommodated, and the casing 330 surrounds the stator 310 and the rotor 320. The upper casing 331 and the lower casing 332 may be configured to seal an open lower roll of the upper casing 331.

In addition, the bearing part 340 supporting the rotation of the rotor 320 in the casing 330 generates a fluid dynamic pressure on one of an outer surface of the magnet 321 and an inner surface of the casing 330. A plurality of dynamic pressure generating grooves 341 are formed.

Here, the dynamic pressure generating groove 341 is preferably formed on the outer peripheral surface of the magnet 321 to generate a radial dynamic pressure between the outer peripheral surface of the magnet 321 and the vertical inner surface of the casing 330. Do.

In addition, a plurality of further dynamic pressure generating grooves 341a are formed on the upper surface of the magnet 321 so as to generate thrust dynamic pressure between the horizontal inner circumferential surface of the casing 330.

When power is supplied from the outside to the coil 112, 212 side of the outer rotor type motor 100, 200 having the above-described configuration through the terminal portions 116, 216, as shown in Figs. By the interaction between the electric field generated in the coils 112 and 212 wound on the cores 111 and 211 and the magnetic fields generated in the magnets 121 and 221 of the rotors 120 and 220, The rotor 120 disposed outside the stator 110 or the rotor 220 disposed inside the stator 210 rotates the center Y (Y ') of the stators 110 and 210. It starts to rotate in one direction.

In this case, a plurality of dynamic pressure generating grooves 131 for generating a fluid dynamic pressure are formed in one of the outer end of the tooth 113 and the inner circumferential surface of the magnet 121 constituting the core 111 or the core 211. Since a plurality of dynamic pressure generating grooves 231 for generating fluid dynamic pressure are formed on either one of the inner end of the tooth 213 and the outer circumferential surface of the magnet 221, the inner circumferential surface of the magnet 121 is formed. Fluid dynamic pressure is generated in the gap between the outer ends of the core 111 and the gap between the outer circumferential surface of the magnet 221 and the inner end of the core 211 so that the rotors 120 and 220 rotate in one direction. This can be done smoothly.

In addition, the outer circumferential end of the stator 110 is provided by the guide support 122 provided on the upper and lower surfaces of the magnet 121, and the inner circumferential end of the stator 210 is located on the magnet 221. It is possible to ensure stable rotation of the magnets 121 and 221 while preventing the magnets 121 and 221 that are wrapped and rotated by the guide support 222 provided on the lower surface from being separated outward.

Accordingly, the shaft portion consisting of a shaft and a bearing member provided therein as the conventional bearing parts 130 and 230 for rotatably supporting the rotors 120 and 220 with respect to the stator 110 and 210. Instead, it is possible to replace the dynamic pressure generating grooves (131, 231) capable of rotating the rotor (120, 220) in a non-contact state by generating a fluid dynamic pressure, the outer diameter of the motor (100, 200) It is possible to reduce the size and reduce the manufacturing cost and reduce the manufacturing process and component parts.

At this time, the gap between the inner circumferential surface of the magnets 121 and 221 and the outer ends of the cores 111 and 211 is narrowly formed to 0.005 mm, which is significantly smaller than the conventional air gap of 0.2 mm, as shown in Table 1 below. Since the magnetic resistance generated between the magnet and the magnet can be lowered, the torque efficiency of the motor can be increased.

Air gap (mm) 0.2 0.15 0.1 0.05 0.005 Torque (g.cm) 1.2 1.32 1.46 1.64 1.83

Here, the specific permeability of air filled in the voids is 1, and the specific permeability of the core made of silicon steel sheet is 3500.

In addition, as the outer diameter of the magnets 121 and 221 decreases, the volume of the rotors 120 and 220, which are rotating structures, is also reduced, thereby reducing the inertia force of the rotors 120 and 220, thereby controlling the speed of the motor. Is advantageous.

In addition, when power is supplied from the outside through the terminal portion 316 to the coil 312 side of the motor 300 having the above configuration, as shown in FIG. 7, the coil 312 of the stator 310 is generated. By the interaction between the electric field and the magnetic field generated in the magnet 321 of the rotor 320, the rotor 320 disposed on the stator 310 in one direction with the shaft 322 as the center of rotation It starts to rotate.

In this case, since either of the inner surface of the casing 330 and the outer peripheral surface of the magnet 321 is provided with a plurality of dynamic pressure generating grooves 341 for generating fluid dynamic pressure, the inner surface of the casing 330 By generating a fluid dynamic pressure in the gap between the outer peripheral surface of the magnet 321 and the one-way rotation of the rotor 320 in a non-contact state can be smoothly performed.

At this time, in the casing 330 of the present invention, because the dynamic pressure generating groove for generating fluid dynamic pressure instead of the upper and lower bearing members is formed between the magnet and the upper casing, the motor structure is reduced by reducing the number of components of the motor. It can simplify the manufacturing process, reduce the manufacturing process, reduce the manufacturing cost, and reduce the height of the motor.

According to the present invention as described above, the bearing function for supporting the rotation of the rotor between the rotor and the stator by providing a dynamic pressure generating groove for generating a fluid dynamic pressure in the gap formed between the rotor and the stator, the conventional bearing function It is possible to reduce the manufacturing cost of the motor because it can be replaced by the dynamic pressure generating unit instead of the member to reduce the motor components and manufacturing process, and simplify the assembly structure.

In addition, since the outer diameter and height of the motor can be reduced as compared with the related art, it is possible to miniaturize the motor to meet the user's requirements.

In addition, by forming the gap between the yoke and the magnet smaller than in the related art, the magnetic resistance of the magnetic flux can be reduced, so that the effect of remarkably increasing the drive torque efficiency of the motor is obtained.

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

Claims (16)

A stator having a core having at least one tooth wound around a coil extending in an outer circumferential direction, the stator having a fixed base which is assembled in a center hole of the core and has a terminal portion for applying power to the coil side; It is disposed in the outer space of the stator has a ring-shaped magnet in which the magnetic poles of the N, S poles are alternately magnetized in the circumferential direction, and the guide support portion surrounding the outer peripheral end of the stator is formed in the magnet so that the magnet is not separated Rotor and And a bearing part for supporting the rotation of the rotor by forming a plurality of grooves for generating dynamic pressure on one of the outer end of the tooth and the inner circumferential surface of the magnet. According to claim 1, wherein the guide support is fixed guide guide jaw configured integrally with any one of the upper and lower surfaces of the magnet, and detachable guide support detachably assembled to any one of the upper and lower surfaces of the magnet An electric motor, characterized in that consisting of a jaw. The electric motor according to claim 1, wherein the dynamic pressure generating groove is formed on an inner circumferential surface of the magnet corresponding to the outer end of the tooth to generate a radial dynamic pressure between the tooth and the magnet. The method of claim 1, wherein the inner surface of the guide support portion corresponding to the upper and lower surfaces of the outer end of the tooth to form another dynamic pressure generating groove to generate a thrust dynamic pressure between the tooth and the guide support portion. Electric motor. 4. The electric motor according to claim 3, wherein a thrust bearing is provided on an inner surface of the guide support. The electric motor according to claim 1, wherein a slot space formed between the teeth and another adjacent tooth is filled with a nonmagnetic resin. A stator having a core having at least one tooth wound around the coil extending in an inner circumferential direction, the stator having a fixed base on which the core is mounted and a terminal portion for applying power to the coil side; The guide support portion is disposed in the inner space of the stator and has an annular magnet in which magnetic poles of the N and S poles are alternately magnetized in the circumferential direction, and a guide support portion surrounding the inner circumferential end of the stator is formed in the magnet so that the magnet is not separated. Rotor; And And a bearing portion for supporting the rotation of the rotor by forming a plurality of grooves for generating a dynamic pressure on either one of the inner end of the tooth and the outer circumferential surface of the magnet. According to claim 7, wherein the guide support is fixed guide guide jaw is provided integrally on any one of the upper, lower surfaces of the magnet, and the removable guide support detachably assembled to any one of the upper, lower surfaces of the magnet An electric motor, characterized in that consisting of a jaw. 8. The electric motor according to claim 7, wherein the dynamic pressure generating groove is formed on the outer circumferential surface of the magnet corresponding to the inner end of the tooth to generate a radial dynamic pressure between the tooth and the magnet. [8] The method of claim 7, wherein the inner surface of the guide support portion corresponding to the upper and lower surfaces of the tooth is formed with another dynamic pressure generating groove for generating a thrust dynamic pressure between the tooth and the guide support. Electric motor. The method of claim 10, And an inner surface of the guide support portion corresponding to the upper and lower surfaces of the inner end of the tooth, the thrust bearing being provided. 8. The electric motor of claim 7, wherein a slot space formed between the teeth and another adjacent tooth is filled with a non-magnetic resin. A stator having at least one coil on a base plate, the stator having a terminal portion for supplying power to the coil; A rotor mounted with a shaft at a center of the cylindrical magnet corresponding to the coil; A casing having an inner space in which the stator and the rotor are accommodated; and And a bearing portion for forming a plurality of dynamic pressure generating grooves on either one of an outer surface of the magnet and an inner surface of the casing to support rotation of the rotor in the casing. The electric motor of claim 13, wherein the dynamic pressure generating groove is formed on an outer circumferential surface of the magnet to generate a radial dynamic pressure between an outer circumferential surface of the magnet and a vertical inner surface of the casing. 14. The electric motor according to claim 13, wherein a plurality of further dynamic pressure generating grooves are formed on an upper surface of the magnet to generate thrust dynamic pressure between the horizontal inner peripheral surface of the upper casing. 14. The electric motor of claim 13, wherein the casing comprises an upper casing surrounding the stator and the rotor, and a lower casing sealing the open lower roll of the upper casing.

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