KR20150114879A - A rotor and a motor using the same - Google Patents

Abstract

The present invention relates to a rotor and a motor using the same. The rotor comprises: a main core formed in a cylindrical shape having an outer diameter and an inner diameter different from the outer diameter; a plurality of radial cores which are extended from an outer circumference of the main core in a direction perpendicular to the outer circumference of the main core, and have a width (W2); a plurality of magnetic flux concentrated cores disposed between the radial cores; a plurality of inner mounting units which connect gaps between the main core and the magnetic flux concentrated cores, and have a width (W1) narrower than the width (W2) of the radial cores; a rotor core having a permanent magnet accommodation unit disposed on both sides of the radial cores and arranged in parallel with the radial cores; and a plurality of permanent magnets disposed in the permanent magnet accommodation unit, and magnetized to allow different polarities to face each other about the radial cores.

Description

A ROTOR AND A MOTOR USING THE SAME

To a motor using a rotor and a rotor that obtain high output and prevent scattering.

A motor is a machine for obtaining rotational force from electric energy, and may include a stator and a rotor. The rotor is configured to interact electromagnetically with the stator and can be rotated by a force acting between the magnetic field and the current flowing in the coil.

Permanent magnets used in the rotors of PM (Permanent Magnet) motors are those in which rare earth (for example, neodymium (Nd)) magnets having a high energy density and excellent structural strength are concentrated in specific areas, Severe, high prices. Therefore, when a rare earth magnet is applied to a product, there is a problem that the unit price and the price of the product are increased as compared with a case where a ferrite magnet is applied to a product.

Therefore, research is currently underway to find motors with outputs similar to those of rare earth magnets while using ferrite magnets to find alternatives to rare-earth magnets or through structural modifications.

In addition, there is a problem that the internal structure of the rotor is scattered due to the centrifugal force or the like when the rotor rotates, so that research is underway to obtain mechanical reliability by solving the problem.

Provided is a rotor that achieves high output during low speed and high speed rotation and prevents mechanical spatter during high speed rotation to provide mechanical reliability and a motor using the same.

One embodiment of the rotor includes a cylindrical main core having different outer and inner diameters, a plurality of radial cores extending in a direction perpendicular to the outer periphery of the main core and having a width W2, A plurality of magnetic coupling central cores connecting between the main core and the plurality of magnetic flux concentrating cores and having a width W1 that is thinner than the width W2 of the radial core; And a plurality of permanent magnets provided in the rotor core and the permanent magnet seating portion including a permanent magnet seating portion provided parallel to the core and magnetized so as to face different stimuli about the radial core.

According to an embodiment of the present invention, the rotor core may further include a plurality of inner magnetic flux leakage preventing portions provided on both sides of the plurality of inner coupling portions, and the plurality of inner magnetic flux leakage preventing portions may include a nonmagnetic material.

Further, according to one embodiment, the rotor core further includes a plurality of outer coupling portions connecting the outer sides between the plurality of radial cores and the plurality of magnetic flux concentrating cores, and having a width W4 thinner than the width W2 of the radial core And a plurality of outer magnetic flux leakage preventing portions positioned between the plurality of outer coupling portions and the plurality of permanent magnets. In addition, the plurality of outer magnetic flux leakage preventing portions may include a nonmagnetic material.

One embodiment of the motor includes a shaft, a stator including a plurality of coils located in a plurality of teeth, a cylindrical main core having different outer diameters and inner diameters, a plurality of coils extending in a direction perpendicular to the outer periphery of the main cores, A plurality of magnetic flux concentrating cores located between the plurality of radial cores; a plurality of magnetic flux concentrating cores disposed between the main core and the plurality of magnetic flux concentrating cores and having a width W1 that is thinner than the width W2 of the radial core; And a plurality of permanent magnets provided on the permanent magnet mounting portion and magnetized so that different magnetic poles face each other with respect to the radial core, wherein the plurality of permanent magnet mounting portions are provided on both sides of the radial core, And a rotor.

According to the rotor and the motor using the rotor, the magnetic force is concentrated to increase the driving force at low speed, increase the inductance to increase the driving force at high speed, and prevent the rotor from scattering due to the centrifugal force at high speed.

1 is an axial sectional view of a motor according to an embodiment.
2 is a cross-sectional side view of a motor according to one embodiment.
3 is a cross-sectional side view of a rotor according to one embodiment.
4 is a cross-sectional side view of a rotor core according to one embodiment.
5 is a perspective view of a rotor according to one embodiment.
6 shows a concept of a magnetization direction of a plurality of permanent magnets to be magnetized on a rotor according to an embodiment.
FIG. 7 illustrates the concept that the magnetic flux of a plurality of permanent magnets is concentrated in the magnetic flux concentration core according to an embodiment.
FIG. 8 illustrates a concept in which the q-axis inductance is increased by a radial core according to an embodiment.
FIG. 9 illustrates a displacement of a rotor by centrifugal force through a simulation according to an embodiment.
FIG. 10 shows the stress due to the centrifugal force of the rotor through a simulation according to an embodiment.
11 is a cross-sectional view of a motor according to another embodiment.
12 is a cross-sectional side view of a rotor according to another embodiment.
13 is a cross-sectional side view of a rotor core according to another embodiment.
14 is a graph for determining the operating point of the motor through a permeance coefficient.
15A shows a concept of a magnetizing direction of a plurality of permanent magnets to be magnetized on a rotor according to another embodiment.
15B is a perspective view of a permanent magnet including a plane chamfered portion according to another embodiment.
16A shows a concept of a magnetizing direction of a plurality of permanent magnets to be magnetized on a rotor according to another embodiment.
16B is a perspective view of a permanent magnet including a chamfered chamfered portion according to another embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The terms used in the following description are terms selected in consideration of functions in the embodiments, and the meaning of the terms may vary depending on the user, the intention or custom of the operator, and the like. Therefore, the meaning of the terms used in the following embodiments is defined according to the definition when specifically defined below, and in the absence of a specific definition, it should be construed in a sense generally recognized by ordinary artisans.

In addition, the configurations selectively described below or selectively described embodiments of the embodiments described below are not necessarily mutually exclusive, unless the technical details are apparent to those of ordinary skill in the art, It should be understood.

Hereinafter, an embodiment of a rotor and a motor using the rotor will be described with reference to the accompanying drawings.

Hereinafter, an embodiment of a motor including a rotor will be described with reference to FIGS. 1 and 2. FIG.

Figure 1 shows an axial section of the motor, Figure 2 shows a cross section of the motor.

The motor 100 may include a motor housing 190, a stator 300, a shaft 400, and a rotor 200.

The motor housing 190 forms an outer surface of the motor 100 and engages with the fixing protrusion 360 of the stator 300 to provide a fixing force so that the stator 300 is not rotated.

In addition, the motor housing 190 can be divided into a first motor housing 190a and a second motor housing 190b on the basis of a horizontal axis. The first motor housing 190a and the second motor housing 190b may be connected to the stator 300.

The stator 300 may include a stator core 310, a tooth 350, a coil 340, an insulator 320, and a fixing protrusion 360.

The stator core 310 maintains the shape of the stator 300 by forming the skeleton of the stator 300. When one tooth 350 is magnetized by the power source, the other teeth 350 adjacent to the one tooth 350 It is possible to provide a passage in which a magnetic field is formed so as to be inductively magnetized with a polarity different from that of the magnetized by the power source.

Further, the stator core 310 may be formed to have a cylinder shape, and may be formed by laminating press-processed steel sheets. A plurality of teeth 350 may be disposed in the circumferential direction of the stator core 310 and a plurality of fixing protrusions 360 may be located outside the stator core 310. In addition, various shapes for retaining the shape of the stator 300 and allowing the teeth 350 and the fixing protrusions 360 to be positioned may be used as an example of the shape of the stator core 310.

In addition, the stator core 310 may be formed with a plurality of first insertion holes that pass through the stator core 310 in the axial direction. A fastening member such as a pin, a rivet, or a bolt may be inserted into the first insertion hole to engage the respective plates constituting the stator core 310.

The first motor housing 190a and the second motor housing 190b are formed with first insertion protrusions so as to engage with the first insertion holes of the stator core 310 so that the first motor housing 190a and the stator 300, The second motor housing 190b and the stator 300 may be connected to each other so that the first motor housing 190a and the second motor housing 190b are provided with housing through holes corresponding to the first insertion holes of the stator core 310 The first motor housing 190a, the second motor housing 190b, and the stator 300 may be connected by a single fastening member.

A plurality of teeth 350 are disposed inside the stator core 310 divided by the stator core 310 so that the space inside the stator core 310 can be divided into a plurality of slots along the circumferential direction. The teeth 350 may provide a space for the coil 340 to be positioned and may be magnetized to one of the N pole and the S pole by a magnetic field formed by a power source supplied to the coil 340.

The tooth 350 may have a shape of Y and a surface adjacent to the rotor 200 out of the outer surface of the tooth 350 may generate attraction and repulsive force with the magnetic flux concentration core 235 in the rotor 200 efficiently It can have a smooth surface. In addition, various structures may be used as an example of the teeth 350 to provide a space for the coils 340 to be located and efficiently generate attractive force and repulsive force with the magnetic flux concentrating core 235.

The coil 340 is located in the insulator 320 located on the teeth 350 of the stator 300 and can generate a magnetic field due to the applied power. Thus, the coil 340 can magnetize the tooth 350 on which the coil 340 is located.

Further, the power source supplied to the coil 340 may be in the form of a three-phase or a single phase.

For example, when the power supplied to the coil 340 is of a three-phase type, the three pairs of coils 340 shown in FIG. 2 are grouped to supply power to the U phase, and the other three pairs of coils 340 The power of the V phase is supplied, and the remaining three pairs of the coils 340 are grouped to supply power to the W phase.

A combination of the various coils 340 for controlling the rotation of the rotor 200 and efficiently applying attraction and repulsion between the magnetic fields of the rotor 200 and the stator 300 is used as an example of the combination of the coils 340 It will be possible.

In addition, the winding method of the coil 340 can be wound by the concentrated winding method and the distributed winding method. The concentrated winding method is a method in which the coil 340 is wound around the stator 300 so that the number of slots on one pole is one and the distributed winding method is a method of winding the coil 340 in two or more slots to be. In addition, various methods for efficiently magnetizing the teeth 350 may be used as an example of a method of winding the coils 340.

Finally, the material used for the coil 340 may be a composite material of copper, aluminum, or copper and aluminum. In addition, various materials for effectively magnetizing the teeth 350 may be used as an example of the material of the coil 340.

The insulator 320 is an insulating member for preventing the material of the stator 300 having electromagnetic conductivity from contacting and coiling with the coil 340. The insulator 320 includes a first insulator 320a and a second insulator 320b Can be divided.

The first insulator 320a and the second insulator 320b are formed of an electrically insulating material and disposed on both sides of the stator core 310 with respect to the axial direction. The first insulator 320a and the second insulator 320b are respectively coupled to both sides of the stator core 310 so as to cover the stator 300. [

The first insulator 320a and the second insulator 320b are formed with second insertion protrusions protruding toward the stator core 310 and inserted into the second insertion holes formed in the stator core 310, .

The first insulator 320a and the second insulator 320b may include an annular rim, a plurality of coil supports arranged corresponding to the stator core 310, a coil guide portion protruding radially inward and outward of the coil support portion have.

Also, the coil supports may be circumferentially spaced so that a space corresponding to the slots of the stator 300 may be formed between the coil supports.

The fixing protrusions 360 are formed on the outer circumferential surface of the stator 300 in such a manner that the stator 300 is rotated in a direction opposite to the direction in which the stator 300 is rotated by the magnetic force generated between the magnetic field generated by the permanent magnets 280, So as to be fixed without being rotated.

The fixing protrusion 360 may be formed perpendicularly to the shaft 400 so as to be engageable with the groove of the motor housing 190 on the outer side wall of the stator core 310 or may be formed in parallel. In addition, various shapes for fixing the stator 300 to the motor housing 190 may be used as an example of the fixing protrusion 360. [

The shaft 400 may be connected to the shaft insertion hole 215 of the rotor 200 so as to rotate together with the rotor 200. One side of the shaft 400 is rotatably supported on the second motor housing 190b through a bearing 130 and the other side of the shaft 400 is rotatably supported on the first motor housing 190a through a bearing 130. [ . One side of the shaft 400 supported by the second motor housing 190b is connected to the motor housing 190 through an opening 180 formed in the second motor housing 190b, Can be connected.

The rotor 200 is an apparatus for obtaining a rotational force of the motor 100 by applying an attractive force or a repulsive force between a magnetic field generated by the permanent magnet 280 and a magnetic field formed on the teeth 350 of the stator 300, A first rotor housing 290a and a second rotor housing 290b are provided on the lateral surface of the rotor 200 and a third rotor housing 290c ) May be provided. The rotor 200 may include a rotor core 210 and a permanent magnet 280.

A specific description of the rotor 200 will be described with reference to Figs. 3 to 5 below.

Hereinafter, an embodiment of the rotor will be described with reference to FIGS. 3 to 5. FIG.

Fig. 3 shows a cross-section of the rotor, and Fig. 4 shows a cross-section of the rotor core.

The rotor 200 includes a rotor core 210 for concentrating passages and magnetic fluxes of the magnetic field formed by the permanent magnet 280 and preventing scattering of the magnetic field, A rotor housing 290 and a permanent magnet 280 forming a magnetic field.

The rotor core 210 includes a main core 220, a radial core 225, a magnetic flux concentrating core 235, an inner coupling portion 240, an inner magnetic flux leakage preventing portion 250, an outer coupling portion 245, An outer flux leakage preventing portion 255, a permanent magnet mounting portion 230, and a coupling hole 260. [

The main core 220 may have a cylindrical shape and may include a shaft insertion hole 215 connected to the shaft 400 therein.

The main core 220 may form the framework of the rotor 200 so that the shape of the rotor 200 is maintained from the stress acting on the rotor 200 when the rotor 200 rotates. The main core 220 may also function to provide a path of magnetic fields formed by the permanent magnets 280 so that magnetic flux flows along the main core 220.

The radial core 225 may be coupled to the main core 220 in such a manner that the radial core 225 radiates outward perpendicularly to the circumferential direction of the rotor 200. The radial core 225 may provide a path for magnetic flux to flow through the magnetic field formed by the pair of permanent magnets 280 adjacent the radial core 225 and may be electromagnetically coupled to the main core 220 the q-axis inductance can be increased.

Further, the radial core 225 may have a constant width of one radial core 225 so that the pair of adjacent permanent magnets 280 are arranged in parallel, and the pair of adjacent permanent magnets 280 may have a predetermined angle The width of the radial core 225 on the outer side of the circumference may be larger than the width of the radial core 225 on the inner side of the circumference so as to be disposed at a predetermined distance (for example, 20 [deg]). In addition, the shape of the various radial cores 225 for arranging the pair of permanent magnets 280 may be used as an example of the shape of the radial core 225.

The magnetic flux concentration core 235 induces magnetic fields generated by the permanent magnets 280 located on both sides of the magnetic flux concentration core 235 to be formed in the magnetic flux concentration core 235 to concentrate the magnetic flux.

In addition, the magnetic flux concentration core 235 may have a fan shape as shown in FIG. In addition, the radius of the sector may be different from the radius of the rotor 200 or may be the same.

The inner coupling portion 240 reduces scattering of the magnetic flux concentrated core 235 due to the centrifugal force generated from the center of the rotor 200 when the rotor 200 rotates. The inner coupling portion 240 is located between the inner side of the magnetic flux concentrating core 235 and the outer side of the main core 220 and is coupled to the inner side of the magnetic flux concentrating core 235 and the outer side of the main core 220. [ Accordingly, the inner coupling portion 240 can reduce the displacement caused by the magnetic flux concentration core 235 moving to the outside due to the centrifugal force, thereby reducing scattering of the magnetic flux concentration core 235.

The inner magnetic flux leakage preventing part 250 is located on both sides of the inner engaging part 240 to reduce leakage of the magnetic flux flowing in and out of the permanent magnet 280. The inner magnetic flux leakage preventing part 250 is provided between the inner side of the permanent magnet 280 in the center direction of the rotor 200 and the outer side of the main core 220 and filled with a nonmagnetic material such as plastic or air, The leakage of the magnetic flux formed by the magnetic core 280 to the main core 220 can be reduced.

The outer coupling portion 245 reduces scattering of the magnetic flux concentrated core 235, the radial core 225, and the permanent magnet 280 due to the centrifugal force generated from the center of the rotor 200 when the rotor 200 rotates. do. Specifically, outer coupling portion 245 is positioned between radial core 225 and magnetic flux concentrating core 235 and is coupled to radial core 225 and magnetic flux concentrating core 235. Accordingly, the outer engaging portion 245 reduces the displacement caused by the movement of the magnetic flux concentrating core 235, the radial core 225, and the permanent magnet 280 due to the centrifugal force to the outer periphery of the magnetic flux concentrating core 235, The scattering of the permanent magnet 225 and the permanent magnet 280 can be reduced.

Also, the outer coupling portion 245 may be omitted, if the mechanical reliability of the rotor 200 is high according to the embodiment.

The outer flux leakage preventing portion 255 is positioned outside the permanent magnet 280 to reduce the leakage of the magnetic flux flowing in and out of the permanent magnet 280. The outer magnetic flux leakage preventing portion 255 is provided between the outer side of the permanent magnet 280 and the inner side of the outer engaging portion 245 and is filled with a nonmagnetic material like the inner magnetic flux leakage preventing portion 250, 280 to the main core 220 can be reduced.

The materials of the main core 220, the radial core 225, the magnetic flux concentrating core 235, the inner engaging portion 240 and the outer engaging portion 245 mentioned above are provided to provide a path through which magnetic flux flows and to have electrical conductivity Soft magnetic materials and metals may be used. In addition, a variety of materials that are electromagnetically conductive and that do not deform in shape from external stress can be used for the main core 220, the radial core 225, the magnetic flux concentrating core 235, the inner coupling portion 240, 245). ≪ / RTI >

The inner coupling portion 240 and the outer coupling portion 245 provide a path for leakage of the magnetic flux generated by the permanent magnet 280 as the width increases, and is set to a value less than a preset value. For example, the width W1 of the inner coupling portion 240 and the width W4 of the outer coupling portion 245 can be set to 1 mm or less. The width W1 of the inner engaging portion 240 and the width W2 of the outer engaging portion 245 are set so as to prevent leakage of the magnet and prevent deformation of the rotor core 210 due to stress during high- W4). ≪ / RTI >

In addition, the radial core 225 and the main core 220 are set at a preset ratio to provide a path through which the magnetic flux flows.

The permanent magnet seating portion 230 is positioned between the two radial cores 225 and the magnetic flux concentrating core 235 which are spaced apart from each other with respect to the magnetic flux concentrating core 235 so that the permanent magnet 280 is magnetized Provide space.

4, the permanent magnet mounting portion 230 is divided into a first permanent magnet mounting portion 230a and a second permanent magnet mounting portion 230b with reference to the magnetic flux concentrating core 235. [ The permanent magnet seating part 230 is formed with a groove having a size corresponding to the size of the permanent magnet 280 to which the permanent magnet 280 is seated, and the permanent magnet 280 can be seated in the formed groove. The width of the groove formed in the permanent magnet seating portion 230 may be greater than the width of the inner magnetic flux leakage preventing portion 250 and the outer magnetic flux leakage preventing portion 255. [ The grooves formed in the permanent magnet seating portion 230 may be formed parallel to the radial core 225 or may be formed to have a predetermined angle between the permanent magnet seating portion 230 and the radial core 225 . The predetermined angle may be a value set according to the intensity of the magnetic flux to be concentrated and the q-axis inductance to be increased or the like. For example, the predetermined angle may be a value of 20 [deg] or less. In addition, various angles set in consideration of the intensity of the magnetic flux to be concentrated and the q-axis inductance to be increased may be used as an example of the predetermined angle.

In addition, various shapes for seating the permanent magnet 280 may be used as an example of the permanent magnet seating portion 230.

Figure 5 shows the appearance of the rotor to which the rotor housing is coupled.

The coupling hole 260 is formed to correspond to the coupling protrusion 265 of the rotor housing 290 and is a coupling member for coupling the rotor housing 290 and the rotor core 210 to each other. The coupling hole 260 may be formed in the magnetic flux concentrating core 235 as shown in FIG. 5, and the width of the coupling hole 260 may be equal to or greater than the width of the coupling projection 265. The engaging hole 260 may have a cylindrical shape corresponding to the shape of the engaging projection 265, or may have a polygonal columnar shape.

The rotor housing 290 is coupled with the rotor core 210 to prevent the permanent magnet 280 magnetized on the permanent magnet mounting portion 230 from flowing out of the rotor core 210. In addition, the rotor housing 290 can be divided into a first rotor housing 290a and a second rotor housing 290b on the basis of a horizontal axis.

A first coupling protrusion 265a corresponding to the shape of the coupling hole 260 is provided on the connection side of the first rotor housing 290a and a coupling hole 260 corresponding to the shape of the coupling hole 260 is provided on the coupling side of the second rotor housing 290b. A second engaging projection 265b may be provided.

A support hole 292 may be formed at the center of the first rotor housing 290a and the second rotor housing 290b so that the shaft 400 connected to the shaft insertion hole 215 is supported. The radius of the first support hole 292a formed at the center of the first rotor housing 290a may be smaller than the radius of the shaft insertion hole 215 for supporting the shaft 400 and the radius of the first support hole 292a May be smaller than the other side radius of the first support hole 292a. However, the radius of the second support hole 292b formed at the center of the second rotor housing 290b on the side where the shaft 400 is connected to the device requiring rotational force is equal to the radius of the shaft insertion hole 215 It may or may not be large.

Hereinafter, one embodiment of magnetizing and magnetic flux concentration of a plurality of permanent magnets will be described with reference to FIGS. 6 and 7. FIG.

Fig. 6 shows the concept of the magnetizing direction of a plurality of permanent magnets 280 to be magnetized on the rotor, and Fig. 7 shows the concept that the magnetic fluxes of a plurality of permanent magnets are concentrated on the magnetic flux concentrating core.

7, the magnetic flux concentrating core 235 forms the pole of the rotor 200 and the q-axis radial core (not shown) 225 are magnetized to the permanent magnet mounting portion 230 so that magnetic flux can flow to another adjacent permanent magnet 280.

6, the plurality of permanent magnets 280 located on both sides of the magnetic flux concentrating core 235 are symmetrically magnetized so that the same magnetic poles face the magnetic flux concentrating core 235, And the plurality of permanent magnets 280 located on both sides of the radial core 225 are magnetized such that the magnetic poles facing the radial core 225 are different so that magnetic fluxes in the same direction are formed.

For example, a combination of a first permanent magnet 280a and a second permanent magnet 280b adjacent to one radial core 225 is referred to as a first permanent magnet combination 280c, a third permanent magnet 280c adjacent to the other radial core 225, The second permanent magnet 280b and the third permanent magnet 280d which are adjacent to the magnetic flux concentrated core 235 are referred to as a second permanent magnet combination 280f, and the combination of the permanent magnet 280d and the fourth permanent magnet 280e is referred to as a second permanent magnet combination 280f. The second permanent magnet 280b of the second permanent magnet 280b is magnetized in such a manner that the S pole and the N pole are sequentially arranged in the clockwise direction of the circumference and the third permanent magnet 280d is arranged so that the N pole and the S pole are sequentially arranged in the clockwise direction of the circumference . The first permanent magnet 280a and the second permanent magnet 280b located on both sides of the radial core 225 may be magnetized so that the S pole and the N pole are sequentially arranged in the clockwise direction of the circumference.

Even if a ferrite magnet having a remanence and a coercivity lower than that of a rare earth magnet is applied by the magnetizing method of the permanent magnet 280 that concentrates the magnetic flux to the magnetic flux concentrated core 235, An output similar to that obtained by using a magnet can be obtained. In addition, the permanent magnet 280 having the same magnetic flux direction is disposed on both sides of the radial core 225 and magnetized, so that the q-axis inductance is increased as compared with the Spoke type motor, and high output can be obtained at high speed rotation.

The reason why a high output can be obtained at low speed and high rotation due to the magnetizing direction of the radial core 225, the magnetic flux concentration core 235, and the permanent magnet 280 will be described with reference to the following equations (1) to do.

, 리액션 토크는

, 릴럭턴스 토크는

로 표현될 수 있다.Equation (1) is a mathematical expression representing a relationship between a total torque, a reaction torque, and a reluctance torque generated by the motor (100). Among the variables in Equation (1), the total torque is

, The reaction torque is

, The reluctance torque is

. ≪ / RTI >

As shown in Equation (1), the total torque generated by the motor 100 can be expressed by the sum of the reaction torque and the reluctance torque.

, 영구 자석(280)에 의해 형성되는 쇄교 자속은

, 스테이터(300)의 코일(340)에 흐르는 q축 전류는

로 표현될 수 있다.Equation (2) is a formula for calculating the reaction torque. The number of poles of the stimulus among the variables of Equation (2)

And the permanent magnet 280,

, The q-axis current flowing through the coil 340 of the stator 300 is

. ≪ / RTI >

The reaction torque is generated by the interaction between the magnetic flux of the permanent magnet 280 and the electric current, and the reaction torque can be determined by the flux linkage formed by the permanent magnet 280 as shown in Equation (2).

, d축 인덕턴스는

, 스테이터(300)의 코일(340)에 흐르는 d축 전류는

로 표현될 수 있다.Equation (3) is a formula for calculating the reluctance torque. Among the variables in Equation (3), the q-axis inductance is

, the d-axis inductance is

, The d-axis current flowing through the coil 340 of the stator 300 is

. ≪ / RTI >

As in Equation (3), the reluctance torque can be determined by the difference between the q-axis inductance and the d-axis inductance of the stator 300 inductance represented by the sum of the leakage inductance and the magnetizing inductance.

Here, the q-axis inductance and the d-axis inductance are calculated by calculating the self inductance and the mutual inductance, and the inductance of the stator 300 is calculated by converting the calculated inductance of the stator 300 into the dq axis coordinate system which is the angular velocity of the rotor 200 Value.

Equation (4) is a formula for calculating total torque summed by substituting Equations (2) and (3) into Equation (1).

In Equation 4, the first term on the right side is for the reaction torque, and the second term on the right side is for the reluctance torque.

는 영에 가까워 릴럭턴스 토크에 대한 영향은 적을 수 있다. 따라서, 기준 속도 이하에서는 단위 전류당 최대 토크 제어(Maximum Torque Per Ampere Control, MTPA)를 한다고 가정하면 리액션 토크의 영향이 큰 바, 자속 집중 코어(235)에서 자속을 집중시켜 쇄교 자속을 증가시켜 페라이트 자석을 사용하고도 희토류 자석을 사용한 경우와 유사한 토크를 얻을 수 있다.Since the current phase angle is small in a constant torque region which is an area below the base speed

Is close to zero, so the influence on the torque of the reluctance can be small. Therefore, assuming that the maximum torque per unit current (MTPA) per unit current is less than the reference speed, the influence of the reaction torque is large. Accordingly, the magnetic flux is concentrated in the magnetic flux concentrated core 235 to increase the flux linkage, A torque similar to that obtained by using a rare earth magnet can be obtained even if a magnet is used.

Conversely, a method of increasing the torque in the case of the reference speed or more will be described with reference to FIG.

8 shows the concept that the q-axis inductance is increased by the radial core.

Interior Permanent Magnet Motor is operated under voltage and current limit condition in the constant power region which is a region above the reference speed and performs flux weakening control.

In the flux-weakening control, the field magnetic flux is generated from the permanent magnet 280 in the permanent magnet motor 100 and can not be directly controlled. The flux of the d-axis stator 300 corresponding to the magnetic flux component flows, The magnetic flux is generated in a direction opposite to the direction of the magnetic flux of the rotor, thereby reducing the magnitude of the effective magnetic flux of the gap and controlling the induced voltage due to the high rotation to satisfy the voltage limit. For example, a negative d-axis current may flow through the current phase angle adjustment to cancel out the magnetic flux generated in the permanent magnet 280.

In this case, by adjusting the current phase angle, the q-axis current is reduced and the influence of the reaction torque is reduced, so that the influence of the reluctance torque may be large in the constant output region. Therefore, in order to increase the reluctance torque under the voltage and current limiting conditions, the difference between the q-axis inductance and the d-axis inductance must be increased.

Generally, in the case of the buried permanent magnet motor 100 having magnetic salient polarity, the q-axis inductance is larger than the d-axis inductance due to the permanent magnet 280 inserted in the rotor 200. Accordingly, when the radial core 225 is positioned as shown in FIG. 8, the q-axis inductance is increased because the flux due to the q-axis current passes through the radial core 225 without passing through the permanent magnet 280, The torque torque can be increased.

Therefore, even when the reference speed is higher than the reference speed, a high torque can be obtained.

Hereinafter, an embodiment of the rotor will be described with reference to FIGS. 9 and 10. FIG.

Fig. 9 shows displacement due to the centrifugal force of the rotor through simulation, and Fig. 10 shows stress due to the centrifugal force of the rotor through simulation.

This simulation uses ANSYS which structurally analyzes the scattering phenomenon caused by the centrifugal force. The simulation is based on the displacement and the stress of the rotor 200 when rotating the rotor 200 with a radius of 44 [mm] at a rotational speed of 9.6 [kRpm] Is represented by ANSYS.

The first region (a) of FIG. 9 has a displacement of 0 [um] or less, the second region (b) has a displacement of 0.6927 [ (E) is a region having a displacement of 2.771 [um] or less, and the sixth region (f) is a region having a displacement of 3.464 [um] or less , The seventh region (g) has a displacement of 4.156 [um] or less, the eighth region (h) has a displacement of 4.849 [um] or less, the ninth region 10 region (j) shows a region where the displacement is 6.235 [um] or less.

10 is a region having a stress of 0 [MPa] or less, a region having a stress of 24 [MPa] or less and a region having a stress of 49 [MPa] , The 14th region (n) has a stress of 73 MPa or lower, the 15th region o has a stress of 98 MPa or lower, the 16th region p has a stress of 122 MPa or lower , The 17th region (q) has a stress of 147 MPa or less, the 18th region (r) has a stress of 171 MPa or less, the 19th region (s) has a stress of 196 MPa or less, 20 region (t) shows a region having a stress of 220 [MPa] or less.

As shown in FIG. 9, when the rotor 200 is rotated at 9.6 [kRpm], the maximum displacement is about 6.235 [um]. In this case, stress applied to the rotor 200 is, And the stress applied to the elastic member 240 is 158 [MPa].

In this simulation, the yield stress of the rotor core 210, which is the limit value at which the deformation is abruptly increased when stress exceeding a predetermined stress is applied, is 440 [MPa] The inner engaging portion 240 is coupled between the main core 220 and the magnetic flux concentrating core 235 to prevent scattering of the rotor 200 , The mechanical reliability of the rotor 200 is increased.

Hereinafter, another embodiment of the rotor will be described with reference to FIGS. 11 to 13. FIG.

Fig. 11 shows a cross-sectional side view of the motor including the magnetizing guide portion and the chamfering portion.

The motor 100 may include a motor housing 190, a stator 300, a shaft 400, and a rotor 200.

The motor housing 190, the stator 300 and the shaft 400 of Fig. 11 may be the same as or different from the motor housing 190, the stator 300 and the shaft 400 of Fig.

The rotor 200 is an apparatus for obtaining a rotational force of the motor 100 by an attractive force and a repulsive force acting between a magnetic field by the permanent magnet 280 and a magnetic field formed by the teeth 350 of the stator 300, The rotor 200 may be the same as or different from the rotor 200 of FIG.

Further, the rotor 200 may include an inner peripheral side magnetized portion 283.

The inner peripheral side magnetized portion 283 has a configuration in which the magnetized magnetic flux flows into the permanent magnet 280 on the inner peripheral side when the permanent magnet is magnetized. The inner peripheral side magnetized portion 283 may include a magnetizing guide portion 287 of the rotor core 210 and a chamfered portion 285 of the permanent magnet 280.

The inner peripheral side magnetized portion 283 will be described in detail with reference to Figs. 12 to 16 below.

Fig. 12 shows a cross-section of a rotor including a magnetizing guide portion and a chamfered portion, and Fig. 13 shows a cross-sectional side view of a rotor core including a magnetizing guide portion.

The rotor 200 includes a rotor core 210 for concentrating passages and magnetic fluxes of the magnetic field formed by the permanent magnet 280 and preventing scattering of the magnetic field, A rotor housing 290 and a permanent magnet 280 forming a magnetic field.

The rotor core 210 includes a main core 220, a radial core 225, a magnetic flux concentrating core 235, an inner coupling portion 240, an inner magnetic flux leakage preventing portion 250, an outer coupling portion 245, An outer magnetic flux leakage preventing portion 255, a permanent magnet mounting portion 230, a coupling hole 260, and a magnetizing guide portion 287.

The main core 220, the radial core 225, the magnetic flux concentrating core 235, the inner engaging portion 240, the inner magnetic flux leakage preventing portion 250, the outer engaging portion 245, the outer magnetic flux leakage preventing portion 255, And the coupling hole 260 are formed by the main core 220, the radial core 225, the magnetic flux concentrating core 235, the inner coupling portion 240, the inner magnetic flux leakage preventing portion 250, The outer magnetic flux leakage preventing portion 255, and the coupling hole 260, and may be different from each other.

The permanent magnet seating portion 230 is positioned between the two radial cores 225 and the magnetic flux concentrating core 235 which are spaced apart from each other with respect to the magnetic flux concentrating core 235 so that the permanent magnet 280 is magnetized Provide space.

More specifically, the permanent magnet mounting portion 230 is divided into a first permanent magnet mounting portion 230a and a second permanent magnet mounting portion 230b with reference to the magnetic flux concentrating core 235 as shown in FIG. The permanent magnet seating part 230 is formed with a groove having a size corresponding to the size of the permanent magnet 280 to which the permanent magnet 280 is seated, and the permanent magnet 280 can be seated in the formed groove. The width of the groove formed in the permanent magnet seating portion 230 may be greater than the width of the inner magnetic flux leakage preventing portion 250 and the outer magnetic flux leakage preventing portion 255. [ The grooves formed in the permanent magnet seating portion 230 may be formed parallel to the radial core 225 or may be formed to have a predetermined angle between the permanent magnet seating portion 230 and the radial core 225 . The predetermined angle may be a value set according to the intensity of the magnetic flux to be concentrated and the q-axis inductance to be increased or the like. For example, the predetermined angle may be a value of 20 [deg] or less. In addition, various angles set in consideration of the intensity of the magnetic flux to be concentrated and the q-axis inductance to be increased may be used as an example of the predetermined angle.

The permanent magnet seating portion 230 may be chamfered at an inner edge adjacent to the magnetic flux concentrating core 235 according to the shape of the permanent magnet 280 to which the permanent magnet seating portion 230 is seated. Specifically, the clockwise inner corner of the first permanent magnet seating portion 230a and the inner clockwise counterclockwise edge of the second permanent magnet seating portion 230b are chopped in a straight line as shown in FIG. 13 The permanent magnet mounting portion 230 may be formed in a trapezoidal shape or may be formed in a curved shape so that the permanent magnet mounting portion 230 may have a shape in which the ellipse is equally divided with respect to the major and minor axes. Therefore, the inner peripheral side width W5 of the permanent magnet mounting portion 230 may be narrower than the outer peripheral side width W6 (W5 < W6).

In addition, various shapes for seating the permanent magnet 280 may be used as an example of the permanent magnet seating portion 230.

The magnetizing guide portion 287 is positioned between the magnetic flux concentrating core 235 and the inner engaging portion 240 and flows the magnetizing magnetic flux supplied by the magnetizing yoke from the outer peripheral surface of the rotor to the inner permanent magnet 280 of the rotor. That is, since the magnetizing guide portion 287 is mainly supplied to the outer circumferential permanent magnet 280 due to the shape of the magnetic flux concentrated core 235 which becomes narrower toward the inner circumference side, the magnetizing flux supplied from the outer circumferential surface of the magnetic flux concentrating core 235 The magnetizing flux can be supplied to the inner circumferential permanent magnet 280 by guiding the magnetizing flux to the inner circumferential side.

The width of the outer peripheral side of the magnetizing guide portion 287 is formed to be equal to the width of the inner peripheral side so that the center passes through the center of the rotor core 210 like the radial core 225 and the inner engaging portion 240 . The magnetizing guide portion 287 is formed so that the width of the outer circumferential side is narrower than the width of the inner circumferential side so that the molten magnetic flux supplied from the outer circumferential surface of the rotor core 210 is uniformly supplied to the inner circumferential side of the rotor core 210 The magnetic flux can be guided.

The rotor housing 290 may be the same as or different from the rotor housing 290 of Figures 3 and 4.

The permanent magnet 280 generates a magnetic field to generate a magnetic force and a repulsive force, which are generated by the coil 340, to generate a rotational force to rotate the rotor 200. In addition, the permanent magnet 280 can be magnetized as described above with reference to Figs. 6 and 7 to focus the magnetic flux on the magnetic flux concentrating core 235. Fig.

The inner edge adjacent to the magnetic flux concentration core 235 can be chamfered so that the permanent magnet 280 has the same shape as that of the permanent magnet seating portion 230 and has an inner peripheral width smaller than the outer peripheral width.

A detailed description of the chamfered shape of the inner edge of the permanent magnet 280 adjacent to the magnetic flux concentrating core 235 will be described with reference to Figs. 15 and 16 below.

Hereinafter, another embodiment of the thickness of the permanent magnet and the shape of the permanent magnet will be described with reference to FIG.

14 shows a graph for determining the operating point of the motor through a permeance coefficient.

FIG. 14 shows a demagnetizing characteristic curve of the permanent magnet 280. When the magnetic flux density of the demagnetizing characteristic curve is zero, the positive pole of the permanent magnet 280 is an open circuit. In this case, since there is no flux flowing to the outside, the strength of the magnetic field is -Hc, and the strength of the magnetic field at this time is called coercive force.

Also, when the magnetic field strength of the demagnetization curve is zero, the positive pole of the permanent magnet 280 is a closed circuit to which a keeper of infinity is connected. In this case, the magnetic flux density is Br, and the magnetic flux density at this time is called the maximum magnetic flux density.

14 shows the operating line of the motor 100. The permeance coefficient Pc indicative of the slope of the operating line is calculated through Equations (5) to (9).

, 공극의 자계의 세기는

, 영구 자석(280)의 두께는

, 공극의 두께는

, 기자력 손실 계수 또는 릴럭턴스 계수는

로 표현될 수 있다.Equation (5) is a formula representing the relationship between the intensity of the magnetic field of the permanent magnet 280 and the intensity of the magnetic field of the gap. Of the variables in Equation (5), the strength of the magnetic field of the permanent magnet 280 is

, The intensity of the magnetic field in the air gap

, The thickness of the permanent magnet 280 is

, The thickness of the pores is

, The magnetomotive force loss coefficient or the reluctance coefficient

. &Lt; / RTI &gt;

(5) and the formula of the magnetomotive force from the regular law of Ampere in the magnetic circuit can be summarized as shown in Equation (6).

Equation (6) is a formula summarizing the magnetic field strength of the permanent magnet (280) by summarizing the formula for the magnetomotive force derived from the equation (5) and the regular law of the amperes. Considering Equation (6), it can be seen that the intensity of the magnetic field of the permanent magnet 280 is proportional to the intensity of the magnetic field of the cavity and the thickness of the cavity and the thickness of the cavity, and inversely proportional to the thickness of the permanent magnet 280.

, 공극의 자속 밀도는

, 영구 자석(280)의 단면적은

, 공극의 단면적은

, 자속의 누설 계수 또는 영구 자석에서 만들어진 자속과 공극 자속의 비는

로 표현될 수 있다.Equation (7) is a formula representing the relationship between the magnetic flux density of the permanent magnet 280 and the magnetic flux density of the air gap. Of the parameters in Equation (7), the magnetic flux density of the permanent magnet 280 is

, The magnetic flux density of the air gap

, The cross-sectional area of the permanent magnet 280

, The cross-sectional area of the void

, The leakage coefficient of the flux, or the ratio of the magnetic flux produced by the permanent magnet to the air flux

. &Lt; / RTI &gt;

The continuous condition of the magnetic flux in the magnetic circuit having the formula (7) and the permanent magnet (280) can be summarized as the following equation (8).

Equation (8) is a formula summarized for Equation (7) and the magnetic flux density of the permanent magnet (280) by summarizing the equations for the continuous condition of the magnetic flux in the magnetic circuit. Considering Equation (8), it can be seen that the magnetic flux density of the permanent magnet 280 is proportional to the leakage coefficient of the magnetic flux, the cross-sectional area of the gap, and the magnetic field strength of the gap, and inversely proportional to the cross-sectional area of the permanent magnet.

, 비례 상수는

로 표현될 수 있다.Equation (9) is a formula for calculating the permeance coefficient by summarizing Equations (6) and (8). Among the parameters in Equation 9, the permeance coefficient is

, The proportional constant is

. &Lt; / RTI &gt;

Referring to Equation 9, the permeance coefficient is proportional to the proportional constant, the cross-sectional area of the gap, and the thickness of the permanent magnet 280, and is inversely proportional to the cross-sectional area of the permanent magnet 280 and the thickness of the gap. Here, the proportional constant in the motor 100, the cross-sectional area of the permanent magnet 280, the cross-sectional area of the gap, and the thickness of the gap are difficult to be changed. The permeance coefficient can be determined according to the thickness of the permanent magnet 280 have.

In this case, the operating point of the motor 100 is the point at which the operating line of the motor 100 meets the potato characteristic curve of the permanent magnet 280, and the operating point in the magnetic circuit is changed due to external influences, The operating characteristics of the motor 100 change.

Specifically, the operating point can be changed by application of an external magnetic field, a change in permeance coefficient, and a change in operating temperature. If the absolute value of the permeance coefficient is low because the thickness of the permanent magnet 280 is small as shown in Equation (9), the operating point becomes And moves to the left lower end of Fig. In this case, when the thickness of the permanent magnet 280 becomes thinner and passes the knee point of the demagnetization curve of the permanent magnet 280, the motor 100 recovers to the original operating point of the permanent magnet 280 A non-irreversible potato occurs. Therefore, in order to prevent irreversible magnetization of the motor 100, the permanent magnet 280 should have a thickness of a predetermined thickness or more.

Conversely, if the thickness of the permanent magnet 280 is increased, the magnetic torque is increased and the possibility of irreversible potato is lowered. However, as the thickness of the permanent magnet 280 becomes thicker, the width of the radial core 225 narrows, and the q-axis inductance decreases, thereby reducing the reluctance torque and reducing the total torque. As the thickness of the permanent magnet 280 becomes thicker, the width of the magnetic flux concentrating core 235 becomes narrower, so that the magnetizing magnetic flux supplied by the magnetizing yoke is applied to the permanent magnet 280 located on the inner peripheral side of the rotor core 210 The magnetizing flux can not be uniformly supplied. Therefore, the permanent magnet 280 on the inner circumferential side of the rotor 200 is caused to have a nonadherent region. Therefore, the permanent magnet 280 should have a thickness of a certain thickness or less in order to prevent the permanent magnet 280 of the motor 100 from reaching the dead zone.

Therefore, the permanent magnet 280 can solve the above problem through the chamfering portion 285 chamfering the edge on the inner circumferential side adjacent to the magnetic flux concentration core 235.

Specifically, in order to prevent irreversible potatoes whose operating point is reduced beyond the bending point while decreasing the permeability coefficient due to the reduction of the thickness of the permanent magnet 280, the thickness of the outer circumferential side of the permanent magnet 280 is set to a certain thickness Or more.

Further, the inner peripheral edge of the permanent magnet 280 adjacent to the magnetic flux concentrating core 235 may be chamfered, so that the inner peripheral side thickness may be thinner than the outer peripheral side thickness. The magnetizing guide portion 287 formed to correspond to the shape of the permanent magnet 280 guides the magnetizing flux supplied from the outer circumferential surface of the rotor core 210 to the inner circumferential side of the rotor core 210, It is possible to prevent the occurrence of an undamaged area on the inner circumferential side

In addition, the rotor core 210 has a wedge shape in which the bent portion of the rotor core 210 is not circular, while the bent portion of the rotor core 210 faces the outer circumferential surface, and the unbent portion of the rotor core 210 faces the inner circumferential surface.

Hereinafter, a detailed description of the shape of the permanent magnet 280 will be described with reference to Figs. 15 to 16 below.

Fig. 15A shows a concept of a magnetizing direction of a plurality of permanent magnets to be magnetized on a rotor, and Fig. 15B shows an outer appearance of a permanent magnet including a plane chamfered portion.

15A, a plurality of permanent magnets 280X positioned on both sides of the magnetic flux concentrating core 235 are magnetically symmetrically magnetized so that the same magnetic poles face the magnetic flux concentrating core 235, The plurality of permanent magnets 280X located on both sides of the core 225 are magnetized such that the magnetic poles facing the radial core 225 are different so that magnetic fluxes in the same direction are formed.

For example, a combination of a first permanent magnet 280a and a second permanent magnet 280b adjacent to one radial core 225 is referred to as a first permanent magnet combination 280c, a third permanent magnet 280c adjacent to the other radial core 225, The second permanent magnet 280b and the third permanent magnet 280d which are adjacent to the magnetic flux concentrated core 235 are referred to as a second permanent magnet combination 280f, and the combination of the permanent magnet 280d and the fourth permanent magnet 280e is referred to as a second permanent magnet combination 280f. The second permanent magnet 280b of the second permanent magnet 280b is magnetized in such a manner that the S pole and the N pole are sequentially arranged in the clockwise direction of the circumference and the third permanent magnet 280d is arranged so that the N pole and the S pole are sequentially arranged in the clockwise direction of the circumference . The first permanent magnet 280a and the second permanent magnet 280b located on both sides of the radial core 225 may be magnetized so that the S pole and the N pole are sequentially arranged in the clockwise direction of the circumference.

The material of the permanent magnet 280X may be the same as or different from that of the permanent magnet 280 of Figs. 2 to 7.

Further, the permanent magnet 280X may include a chamfering portion 287X as shown in Figs. 15A and 15B.

As described with reference to Fig. 14, in the case of the motor 100 including the permanent magnet 280X in block form, the chamfering portion 287X generates irreversible potatoes when the thickness of the permanent magnet 280X is thin, If the thickness of the permanent magnet 280X is large, it is possible to reduce the occurrence of the permanent magnet 280X on the inner circumferential side of the rotor 200.

More specifically, the permanent magnet 280X including the chamfering portion 285X is caused by the chamfering portion 285X provided on the inner circumferential side of the rotor 200 even if the thickness of the inner circumferential side of the rotor 200 becomes thinner than a certain thickness The thickness of the outer circumferential side of the rotor 200 is thicker than a certain thickness, so that the potlife of the permanent magnet (280X) can be ensured and the length of the rib becomes long, so that the leakage magnetic flux can be reduced. Therefore, it is possible to prevent irreversible potatoes from occurring when the operating point of the motor 100 passes beyond the bending point.

Even if the thickness of the permanent magnet 280X including the chamfering portion 285X is thicker than the thickness of the outer circumferential side of the rotor 200, the chamfering portion 285X provided on the inner circumferential side of the rotor 200, Even if the thickness of the outer circumferential permanent magnet 280X is thick, the outer circumferential side is a position where the magnetizing magnetic flux is easy to flow, and the permanent magnet 280X may not have a notch region.

The chamfering portion 285X shown in Figs. 15A and 15B can be chamfered in a straight line toward one surface of the permanent magnet 280X adjacent to the inner circumferential surface of the rotor 200 so that the thickness of the inner circumferential side of the rotor 200 becomes thin. Thus, as shown in Fig. 15B, the chamfering portion 285X can have a flat surface.

Further, the chamfering portion 285X may have one plane as shown in Fig. 15B, or may have a plurality of planes.

The degree of chamfering of the inner peripheral edge adjacent to the magnetic flux concentrating core 235 by the chamfering portion 285X (for example, the ratio of the width and the length) is determined by the size of the rotor 200, The specification, the output of the motor 100, and the like. Other variables may be used as an example of determining the degree of chamfering of the chamfering portion 285X.

FIG. 16A shows a concept of magnetization directions of a plurality of permanent magnets to be magnetized on a rotor, and FIG. 16B shows an outer appearance of a permanent magnet including a chamfered portion of a curved surface.

The type, material, and magnetization direction of the permanent magnet 280Y shown in Figs. 16A and 16B may be the same as or different from those of the permanent magnets 280X shown in Figs. 15A and 15B.

Further, the permanent magnet 280Y may include a chamfering portion 285Y as shown in Figs. 16A and 16B.

As described with reference to Fig. 14, in the case of the motor 100 including the permanent magnet 280Y in block form, the chamfering portion 285Y generates an irreversible potato when the thickness of the permanent magnet 280Y is thin, If the thickness of the permanent magnet 280Y is large, it is possible to reduce the occurrence of the permanent magnet 280Y on the inner circumferential side of the rotor 200. [

More specifically, even if the thickness of the permanent magnet including the chamfering portion 285Y becomes thinner than a certain thickness on the inner circumferential side of the rotor, it is caused by the chamfering portion 285Y provided on the inner circumferential side of the rotor 200, The thickness of the permanent magnet (280 Y) is thicker than the predetermined thickness, and the pot life of the permanent magnet (280 Y) can be ensured, and the length of the rib becomes long, so that the leakage magnetic flux can be reduced. Therefore, it is possible to prevent irreversible potatoes from occurring when the operating point of the motor 100 passes beyond the bending point.

Even if the thickness of the permanent magnet 280Y including the chamfering portion 285Y is thicker than the thickness of the outer circumferential side of the rotor 200, the chamfering portion 285Y provided on the inner circumferential side of the rotor 200, Even if the thickness of the outer circumferential permanent magnet 280Y is thick, the thickness of the outer circumferential magnet 280Y is not thicker than a certain thickness, and the outer circumferential side is a position where the magnetizing magnetic flux is easy to flow.

The chamfering portion 285Y shown in Figs. 16A and 16B can be chamfered in a curved shape toward one surface of the permanent magnet 285Y adjacent to the inner circumferential surface of the rotor 200 so that the thickness of the inner circumferential side of the rotor 200 becomes thinner. Therefore, as shown in Fig. 16B, the chamfering portion 285Y may have a curved surface.

The degree of chamfering the inner peripheral edge adjacent to the magnetic flux concentrating core 235 by the chamfering portion 285Y is determined by the size of the rotor 200, the size of the permanent magnet 280Y, 100, and the like. Other variables may be used as an example of determining the chamfering degree of the chamfering portion 285Y.

The foregoing description is merely illustrative of the technical idea of the present invention, and various modifications, alterations, and permutations thereof may be made without departing from the essential characteristics of the present invention. Therefore, the embodiments and the accompanying drawings described above are intended to illustrate and not limit the technical idea, and the scope of the technical idea is not limited by these embodiments and the accompanying drawings. The scope of which is to be construed in accordance with the following claims, and all technical ideas which are within the scope of the same shall be construed as being included in the scope of the right.

100: motor
200: Rotor
210: rotor core
215: Shaft insertion hole
220: Main core
225: Radial core
230: permanent magnet seat portion
235: magnetic flux concentration core
240: Inner coupling portion
245:
250: Inner magnetic flux leakage preventing portion
255: Outside magnetic flux leakage preventing portion
260: Coupling hole
265:
280: permanent magnet
283:
285: chamfering portion
287:
290: rotor housing
292: Support hole
300:
400: shaft

Claims (21)

A cylindrical main core having different outer diameters and inner diameters,
A plurality of radial cores extending in a direction perpendicular to an outer periphery of the main core and having a width W2;
A plurality of magnetic flux concentrating cores positioned between the plurality of radial cores,
A plurality of inner coupling portions connecting the main core and the plurality of magnetic flux concentrating cores and having a width W1 thinner than the width W2 of the radial core;
A rotor core including permanent magnets seated on both sides of the radial core and parallel to the radial core; And
A plurality of permanent magnets provided in the permanent magnet seating portion and magnetized so as to face different magnetic poles around the radial core;
&Lt; / RTI &gt; The method according to claim 1,
The rotor core includes:
And a plurality of inner magnetic flux leakage preventing portions provided on both sides of the plurality of inner joining portions. 3. The method of claim 2,
Wherein the plurality of inner flux leakage preventing portions comprise a non-magnetic material. The method according to claim 1,
The rotor core includes:
Further comprising a plurality of outer couplings connecting outer sides of said plurality of radial cores and said plurality of magnetic flux focused cores and having a width W4 that is less than a width W2 of said radial cores. 5. The method of claim 4,
The rotor core includes:
And a plurality of outer magnetic flux leakage preventing portions located between the plurality of outer coupling portions and the plurality of permanent magnets. 6. The method of claim 5,
Wherein the plurality of outer flux leakage preventing portions include non-magnetic materials. The method according to claim 1,
Wherein a plurality of permanent magnets located on both sides of each of the radial cores is provided at an angle of 20 deg or less between the permanent magnets. The method according to claim 1,
And the width W1 of the plurality of inner joining portions is 1 mm or less. The method according to claim 1,
And the width W4 of the plurality of outer coupling portions is 1 mm or less. The method according to claim 1,
Wherein the permanent magnet further includes a chamfered portion having an inner circumferential edge adjacent to the magnetic flux concentrating core,
Wherein the rotor core further comprises a magnetizing guide portion formed to correspond to the chamfering portion. 11. The method of claim 10,
Wherein the chamfered portion is formed in one of a planar surface and a curved surface. 11. The method of claim 10,
Wherein the magnetizing guide section has a circumferential outer circumferential width and a circumferential inner circumferential width equal to each other. 11. The method of claim 10,
Wherein the magnetizing guide portion has a circumferential outer circumferential width smaller than an inner circumferential width in the circumferential direction. shaft;
A stator including a plurality of coils located in a plurality of teeth; And
A plurality of radial cores extending in a direction perpendicular to an outer periphery of the main core and having a width W2 and a plurality of magnetic cores disposed between the plurality of radial cores, A plurality of inner coupling portions connecting between the main core and the plurality of magnetic flux concentrating cores and having a width W1 thinner than the width W2 of the radial core; And a plurality of permanent magnets provided in the permanent magnet seating portion and magnetized so as to face different stimuli about the radial core;
/ RTI &gt; 15. The method of claim 14,
A plurality of inner magnetic flux leakage preventing portions provided on both sides of the plurality of inner coupling portions;
And a motor. 16. The method of claim 15,
Wherein the plurality of inner magnetic flux leakage preventing portions comprise non-magnetic materials. 15. The method of claim 14,
Wherein a plurality of permanent magnets located on both sides of each of the radial cores is provided at an angle of 20 deg or less between the permanent magnets. 15. The method of claim 14,
And a width (W1) of the plurality of inner joining portions is not more than 1 [mm]. 15. The method of claim 14,
Wherein the permanent magnet further includes a chamfered portion having an inner circumferential edge adjacent to the magnetic flux concentrating core,
Wherein the magnetic flux concentrating core further comprises a magnetizing guide portion formed to correspond to the chamfering portion. 20. The method of claim 19,
Wherein the magnetizing guide section has a circumferential outer circumferential width and a circumferential inner circumferential width equal to each other. 20. The method of claim 19,
Wherein the magnetizing guide portion has a circumferential outer circumferential width smaller than a circumferential inner circumferential width.

Images