KR20140036362A - Motor and washing machine having the same - Google Patents

Abstract

A plurality of rotor cores and a plurality of permanent magnet blocks are alternately arranged in the circumferential direction. The permanent magnet blocks can effectively suppress the demagnetization generated from some areas of the permanent magnet blocks and also minimize the decrease output density for a flux concentrated type motor magnetized in the circumferential direction to concentrate flux and the present invention relates to an improvement structure of demagnetization internal force capable of being mounted without any additional costs. The present invention comprises a plurality of permanent magnets with different residual flux density indicating particular coercive force and flux generating capacity, wherein the permanent magnet blocks are a plurality of permanent magnets of the same class and the same kind.

Description

TECHNICAL FIELD [0001] The present invention relates to a motor and a washing machine having the same,

The present invention relates to a magnetic flux concentration type motor having improved potato resistance and a washing machine having the same.

Generally, a motor is a device for converting electric energy into mechanical energy by having a fixed stator and a rotor that rotates by electromagnetic interaction with the stator.

In the magnetic flux concentrating type motor, the rotor core and the permanent magnets are arranged alternately along the circumferential direction, and the permanent magnets are magnetized in the circumferential direction so as to concentrate the magnetic flux. Since the magnetic flux density is structurally high, high torque and high output can be generated And the motor can be miniaturized for the same output. The magnetic flux concentration type motor can be widely applied to a driving motor of a washing machine, a driving motor of an electric automobile and a small generator driving motor which require high torque and high output characteristics.

However, the permanent magnet of the magnetic flux concentrating motor can not be free from the potato phenomenon which loses its magnetized property, and prevention of such potato phenomenon is a main consideration in designing the motor.

On the other hand, since the permanent magnets have different performance characteristic values depending on their kinds such as rare earth magnets, ferrite magnets, and alnico magnets, the values of intrinsic coercive force (iHc) representing the potato strength also differ depending on the types thereof. Therefore, there is a method of using a permanent magnet type having a large intrinsic coercive force value such as a rare earth magnet to solve the problem of potatoes. However, the permanent magnet having an excellent coercive force tends to be higher in price.

On the other hand, the intrinsic coercive force values of the same kind of permanent magnets can be changed according to their composition ratios. That is, the intrinsic coercive force varies depending on the composition ratio of the same ferrite magnets, and the cost is maintained at the same level. However, in this case, when the intrinsic coercive force becomes large, the residual flux density (Br), which is a capability of producing a magnetic flux, tends to decrease inversely, and the output density of the motor may be reduced.

On the other hand, the magnetic flux concentrating type motor is characterized in that potatoes are easily generated in a certain area, not in the entire area of the permanent magnet, and potatoes are hardly generated in the remaining area.

One aspect of the present invention discloses a structure of a magnetic flux concentrating motor capable of effectively suppressing potatoes without increasing the material cost.

One aspect of the present invention discloses a structure of a magnetic flux concentrating motor capable of effectively suppressing a potato while minimizing a drop in output density.

According to an aspect of the present invention, a motor includes a stator having a stator core through which a coil is wound, a stator for forming a rotating system when a current is applied to the coil; And a plurality of rotor cores and a plurality of permanent magnet blocks alternately arranged along the circumferential direction, wherein the plurality of permanent magnet blocks are magnetized so that the same polarity faces each other; And the permanent magnet block includes a plurality of permanent magnets having different intrinsic coercive force (iHc) values and residual magnetic flux density (Br) values.

Here, the plurality of permanent magnets may be disposed along the radial direction.

Here, the permanent magnet block includes a first permanent magnet and a second permanent magnet disposed closer to the stator than the first permanent magnet, and the intrinsic coercive force value (iHc2) of the second permanent magnet is greater than the first permanent magnet The residual magnetic flux density value Br2 of the second permanent magnet may be smaller than the residual magnetic flux density value Br1 of the first permanent magnet.

Here, the permanent magnet block may further include a third permanent magnet disposed farther away from the stator than the first permanent magnet, and the intrinsic coercive force value iHc3 of the third permanent magnet may be an intrinsic coercive force value of the first permanent magnet (iHc1) and smaller than the intrinsic coercive force value (iHc2) of the second permanent magnet, and the residual magnetic flux density value (Br3) of the third permanent magnet is smaller than the residual magnetic flux density value (Br1) of the first permanent magnet (IHc3) of the second permanent magnets.

Also, the permanent magnet block may be magnetized in the circumferential direction, the plurality of permanent magnets may be arranged along the radial direction, and each of the N and S poles of the permanent magnet block may be composed of the plurality of permanent magnets.

Each of the plurality of permanent magnets may be a ferrite magnet.

The plurality of permanent magnets may have mutually different composition ratios.

According to another aspect of the present invention, there is provided a motor comprising: a stator having a stator core through which a coil is wound; a stator forming a rotating system when an electric current is applied to the coil; And a rotor in which a plurality of rotor cores and a plurality of permanent magnet blocks are alternately arranged along the circumferential direction and the permanent magnet block is magnetized in a circumferential direction so as to concentrate magnetic fluxes of the same polarity, 1 permanent magnets and a second permanent magnet disposed closer to the stator than the first permanent magnets and having an intrinsic coercive force (iHc) value larger than that of the first permanent magnets.

The permanent magnet block may further include a third permanent magnet disposed farther from the stator than the first permanent magnet and having an intrinsic coercive force (iHc) value larger than that of the first permanent magnet.

According to an aspect of the present invention, there is provided a washing machine comprising: a main body; a tub disposed inside the main body to store washing water; a drum disposed inside the tub and rotatably supported by the driving shaft; And a motor mounted on the tub to rotate the driving shaft, wherein the motor has a stator core in which a coil is wound, and a stator that forms a rotating system when a current is applied to the coil; And a plurality of rotor cores and a plurality of permanent magnet blocks alternately arranged along the circumferential direction and the permanent magnet block being magnetized in a circumferential direction so as to concentrate magnetic fluxes of the same polarity, And includes a plurality of permanent magnets whose density (Br) value and intrinsic coercive force (iHc) value are different from each other.

According to the idea of the present invention, the permanent magnet potato phenomenon of the magnetic flux concentration type motor can be effectively suppressed without increasing the material cost.

Further, the reduction of the output density of the magnetic flux concentration type motor can be minimized, and the potato phenomenon can be effectively suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a view of a washing machine with a motor according to embodiments of the present invention.
2 is a view showing a coupling structure of a motor and a tub according to a first embodiment of the present invention.
3 is an exploded perspective view of a stator of a motor according to a first embodiment of the present invention;
FIG. 4 is a view showing a rotor of a motor according to a first embodiment of the present invention, showing only a rotor core and a permanent magnet block except a molding part; FIG.
Fig. 5 is an enlarged view of a part of the rotor of Fig. 4; Fig.
6 is a diagram schematically showing performance characteristics of a first permanent magnet and a second permanent magnet of a motor according to a first embodiment of the present invention.
FIG. 7 is a view showing a rotor core and a permanent magnet block except a molding part of a rotor of a motor according to a second embodiment of the present invention. FIG.
Fig. 8 is an enlarged view of a part of the rotor of Fig. 7; Fig.
9 is a diagram schematically showing performance characteristics of a first permanent magnet, a second permanent magnet and a third permanent magnet of a motor according to a second embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail.

1 is a view showing a washing machine having a motor according to an embodiment of the present invention. 1, a structure of a washing machine 1 equipped with a motor 40 according to embodiments of the present invention will be described. However, it goes without saying that the motor according to the embodiments of the present invention or the motor including the spirit of the present invention may be applied to various mechanical devices such as an electric car or a small generator as well as a washing machine.

The washing machine 1 is provided with a cabinet 10 for forming an outer appearance, a tub 20 disposed inside the cabinet 10 for storing washing water, And a motor (40) for driving the drum (30).

In the front portion of the cabinet 10, a charging port 11 is formed so that laundry can be charged into the drum 30. The input port (11) is opened and closed by a door (12) provided on a front portion of the cabinet (10).

A water supply pipe 50 for supplying wash water to the tub 20 is installed at an upper portion of the tub 20. One side of the water supply pipe 50 is connected to an external water supply source (not shown), and the other side of the water supply pipe 50 is connected to the detergent supply device 60. The detergent supply device 60 may be connected to the tub 20 via a connection pipe 55. The water supplied through the water supply pipe 50 can be supplied to the inside of the tub 20 together with the detergent via the detergent supply device 60.

A drain pump 70 and a drain pipe 75 for discharging the water inside the tub 20 to the outside of the cabinet 10 are installed in the lower portion of the tub 20.

A plurality of through holes 31 for circulating washing water are formed around the drum 30 and a plurality of lifters 31 are installed on the inner circumferential surface of the drum 30 to allow the laundry to rise and fall when the drum 30 rotates. (32).

The drum 30 and the motor 40 may be connected through a drive shaft 80. The drive shaft 80 transfers the rotational force of the motor 40 to the drum 30. One end of the drive shaft 80 is connected to the drum 30 and the other end of the drive shaft 80 extends outward through the rear wall 21 of the tub 20.

A bearing housing 82 is installed on the rear wall 21 of the tub 20 to rotatably support the drive shaft 80. The bearing housing 82 may be made of aluminum alloy and may be inserted into the rear wall 21 of the tub 20 when the tub 20 is injection molded. Bearings 84 are provided between the bearing housing 82 and the drive shaft 80 so that the drive shaft 80 can rotate smoothly.

Meanwhile, the motor 40 according to the embodiments of the present invention is a magnetic flux concentrating permanent magnet motor having high torque and high output, and can increase the washing power by rotating the drum 30 into which the laundry and the washing water have been charged by a sufficient force. Further, the motor 40 according to the embodiments of the present invention has a structure in which the potato strength is improved to prevent deterioration of the motor performance due to the potato of the permanent magnet. Moreover, such a potentiostatic improvement structure can be implemented at an equivalent cost level without any further increase in cost.

Hereinafter, the structure of the motor 40 according to the embodiments of the present invention will be described in detail.

2 to 6 relate to a motor according to the first embodiment of the present invention. 2 is a view showing a coupling structure of a motor and a tub according to a first embodiment of the present invention. 3 is an exploded perspective view of a stator of a motor according to a first embodiment of the present invention. FIG. 4 is a view showing a rotor of a motor according to a first embodiment of the present invention, showing only a rotor core and a permanent magnet block except for a molding part, FIG. 5 is a cross- And FIG. 6 is a diagram schematically illustrating performance characteristics of the first permanent magnet and the second permanent magnet of the motor according to the first embodiment of the present invention.

2 to 6, the motor 40 according to the first embodiment of the present invention includes a stator 100 mounted on the rear wall 21 of the tub 20, And a rotor 200 that rotates and interacts with the stator 100 electromagnetically.

The motor 40 according to the first embodiment of the present invention is an inner rotor type in which the rotor 200 is disposed inside the stator 100. The idea of the present invention is not limited to this, It is also applicable to an outer rotor type disposed outside.

The stator 100 includes a metallic stator core 130 forming a path of a magnetic flux and a stator core 130 covering the stator core 130 and the stator core 130 110 and 120 may be combined. The insulators 110 and 120 may include a first insulator 110 covering one side of the stator core 130 and a second insulator 120 covering the other side of the stator core 130. [

The stator 100 includes a circular stator body 101, a plurality of stator teeth 102 protruding inward of the stator body 101, coils 130 wound on the plurality of stator teeth 102 And a plurality of fastening holes 103 for fastening the stator 100 to the rear wall 21 of the tub 20.

The stator body 101 supports a plurality of stator teeth 102. The plurality of stator teeth 102 protrude from the inner circumferential surface of the stator body 101 toward the center of the stator body 101 and are arranged at regular intervals in the circumferential direction of the stator body 101.

When a current is applied to the coil 140 wound around the plurality of stators 102 and the polarity of the coil 140 sequentially changes, a rotating magnetic field is generated, and the permanent magnet block 300 Can interact with each other. Therefore, the rotor 200 can be rotated by the repulsive force or attraction force depending on the polarity.

A plurality of fastening holes 22 are formed in the rear wall 21 of the tub 20 and a fastening member S is fastened to the fastening holes 103 of the stator 100 and the fastening holes 22 of the tub 20. [ So that the stator 100 can be fixed to the tub 20.

3, the stator 100 includes a stator core 130, a first insulator 110 and a second insulator 120. The stator 100 includes a stator core 130, Lt; / RTI >

The stator core 130 has a core body 131 having a substantially annular shape and a plurality of core teeth 132 protruding in the direction toward the center of the core body 131 from the inner peripheral surface of the core body 131. The stator core 130 may be formed by laminating a pressed steel plate.

The first insulator 110 and the second insulator 120 are provided to cover the stator core 130 and have insulator bodies 111 and 121 having a substantially annular shape and insulator bodies 111 and 121 at inner circumferential surfaces of the insulator bodies 111 and 121. [ And a plurality of insulator teeth 112 and 122 protruding in the direction toward the center of the insulator teeth 112 and 122. The insulator teeth 112 and 122 are coupled with the core teeth 132 to form stator teeth 102 in which the coils 140 are wound.

The first insulator 110 and the second insulator 120 have fastening holes 113 and 123 for coupling with the tub 20 and fastening holes 113 and 120 of the first insulator 110 and the second insulator 120, And a fastening hole 123 of the stator 110 is formed.

The first insulator 110 may be formed with a connector housing 115 into which a connector 114 for supplying power to the coil 140 wound on the stator teeth 102 is inserted, Metal connection terminals 116 for electrically connecting the coil 140 and the connector 114 may be inserted into the housing 115.

The first insulator 110 and the second insulator 120 may be formed of an electrically insulating material so as to insulate the stator core 130 from the coil 140.

2 and 4, the rotor 200 includes a plurality of rotor cores 220 forming a magnetic path, a plurality of permanent magnets 220 disposed between the respective rotor cores 220 to generate a magnetic flux, A block 300 and a molding part 230 for supporting a plurality of rotor cores 220 and a plurality of permanent magnet blocks 300. 4 and 5 show the rotor 200 in which the molding part 230 is omitted.

The rotor core 220 can support the permanent magnet block 300 while forming a magnetic path. The plurality of rotor cores 220 are arranged along the circumferential direction of the rotor 200, and the permanent magnet blocks 300 are arranged between the respective rotor cores 220. Accordingly, the rotor core 220 and the permanent magnet block 300 are alternately arranged along the circumferential direction.

The rotor core 220 may be formed by laminating a sheet material formed by pressing a silicon steel sheet.

5, the rotor core 220 is rotated by the magnetic flux of the stator core 130 in the process of rotating the rotor 200 by electromagnetic interaction with the stator 100 The permanent magnet block 300 may have potentiostat portions 221 and 222 for preventing the permanent magnet block 300 from being demagnetized.

Here, a potato means that after the permanent magnet is magnetized, the magnetism lost by the external environment such as heat, impact and inverse magnetic field is lost.

Each of the potentiometers 221 and 222 includes a first potentiostat protrusion 221 protruding in the circumferential direction of the rotor 200 from both sides of the permanent magnet block 300 in contact with the permanent magnet block 300, 2 anti-potting protrusions 222. The anti-

The first potentiostat protrusion 221 restricts the gap between the permanent magnet block 300 and the stator core 130 and the path of the magnetic flux of the stator core 130 is easily formed through the first potentiostat protrusions 221 So that the permanent magnet block 300 can be prevented from being demagnetized by the magnetic flux of the stator core 130.

The second potentiostat protrusion 222 is provided at the outer end of the rotor core 220 to guide the path of the magnetic flux of the stator core 130 to be easily formed through the second potentiostat protrusions 222, 300 can be prevented.

The rotor core 220 may have a first engaging hole 223 and a second engaging hole 224 which are engaged with the molding portion 230. The molding part 230 may be received and coupled to the first and second coupling holes 223 and 224 during the injection molding of the molding part 230. The plurality of rotor cores 220, the plurality of permanent magnet blocks 300 and the molding part 230 are accommodated in the first and second coupling holes 223 and 224, Can be more firmly coupled.

The molding part 230 may include a shaft hole 231 to which the driving shaft 80 is coupled and a heat outlet 232 for discharging heat generated during the rotation of the rotor 200.

On the other hand, each of the permanent magnet blocks 300 is magnetized along the circumferential direction. Further, two neighboring permanent magnet blocks 300 are magnetized so that the same polarity faces each other. For example, in FIG. 5, two adjacent permanent magnet blocks 300a and 300b are magnetized such that their N poles face each other. With this structure, the magnetic flux generated in the permanent magnet block 300 can be concentrated, thereby improving the performance while reducing the size of the motor.

Meanwhile, the permanent magnet block 300 of the motor according to the first embodiment of the present invention includes a plurality of permanent magnets 310 and 320. The plurality of permanent magnets 310 and 320 includes a first permanent magnet 310 and a second permanent magnet 320.

The first permanent magnet 310 and the second permanent magnet 320 are magnets having different magnet performance characteristics from each other and arranged along the radial direction of the rotor 200.

As described above, the permanent magnet block 300 is magnetized along the circumferential direction, and the first permanent magnet 310 and the second permanent magnet 320 constituting the permanent magnet block 300 are arranged along the radial direction The N pole or the S pole of the permanent magnet block 300 may be composed of the first permanent magnet 310 and the second permanent magnet 320.

The reason why the plurality of permanent magnets 310 and 320 having different performance characteristic values are arranged along the radial direction of the rotor 200 to form the permanent magnet block 300 is to prevent the permanent magnet block 300 from potatoing.

The motor according to the embodiments of the present invention is a magnetic flux concentrating type motor and because of its structural characteristics, potatoes are easily generated in a part of the area other than the entire area of the permanent magnet block 300, and potatoes are hardly generated in the remaining areas . That is, the magnetic flux concentration type motor may have localized potatoes, not entire potatoes, due to its structural characteristics. At this time, the area where the potatoes are easily generated is the area at the radially outer end of the area of the permanent magnet block 300 that is close to the stator 100.

That is, in the motor according to the first embodiment of the present invention, the region where the second permanent magnet 320 is disposed in the region of the permanent magnet block 300 is an area where potatoes are easily generated.

Therefore, in the motor of the first embodiment of the present invention, the second permanent magnet 320 has a permanent magnet having a large intrinsic coercive force (iHC) value, which is a performance characteristic that indicates the potato force as compared with the first permanent magnet 310 Is used.

However, it is preferable that ferrite magnets are used for both the first permanent magnet 310 and the second permanent magnet 320. The ferrite magnets, the ferrite magnets, and the AlNiCo magnets have different performance characteristics depending on the types of the permanent magnets. Also, the values of the intrinsic coercive force are different depending on the types thereof. Particularly, in the case of rare earth magnets and AlNiCo magnets, Overall, it is excellent, but the price is high.

The motor according to the embodiments of the present invention is preferably a spoke-type magnetic flux concentrating motor in which a large number of permanent magnets are used, and therefore, a cost effective ferrite magnet is preferably used. Therefore, the ferrite magnets are used for the first permanent magnet 310 and the second permanent magnet 320, and the second permanent magnets 320 are formed to have a larger intrinsic coercive force than the first permanent magnets 310, . At this time, different composition ratios are possible at equal cost levels.

However, as is known, the intrinsic coercive force in the permanent magnets of the same kind and the same class and the residual flux density (Br), which indicates the ability to produce the magnetic flux, are in inverse proportion.

6, an intrinsic coercivity value (hereinafter, referred to as 'iHc2') of the second permanent magnet 320 is a value of an intrinsic coercive force (hereinafter referred to as 'iHc1') of the first permanent magnet 310. Therefore, Br2 ') of the second permanent magnet 320 is greater than the residual magnetic flux density value (hereinafter, referred to as' Br1') of the first permanent magnet 310, . Therefore, the relationship of iHc1 &lt; iHc2 and Br2 < Br1 can be established.

Here, in the graph of FIG. 6, x represents the intrinsic coercivity, y represents the residual magnetic flux density, M1 represents the performance characteristic value of the first permanent magnet 310, M2 represents the performance characteristic of the second permanent magnet 320 Value.

Therefore, in the permanent magnet block 300 of the motor according to the first embodiment of the present invention, a permanent magnet having a large intrinsic coercive force, which indicates a potato force, is used in an area where potatoes are easily generated, It is possible to minimize the output deterioration while preventing the permanent magnet block 300 from being demagnetized by using a permanent magnet having a high residual magnetic flux density.

In addition, by using a ferrite magnet inexpensive instead of a rare-earth magnet or an AlNiCo magnet, it is possible to prevent a potato at an equivalent cost level without any additional cost increase.

7 relates to a motor according to a second embodiment of the present invention. 7 is a view showing a rotor core and a permanent magnet block except a molding part of a rotor of a motor according to a second embodiment of the present invention, FIG. 8 is an enlarged view of a part of the rotor of FIG. 7, Is a diagram schematically showing performance characteristics of the first permanent magnet, the second permanent magnet and the third permanent magnet of the motor according to the second embodiment of the present invention.

In the structure of the motor according to the second embodiment of the present invention, the same structures as those of the first embodiment are denoted by the same reference numerals and description thereof may be omitted.

The rotor 200 includes a plurality of rotor cores 220 forming a magnetic path, a plurality of permanent magnet blocks 400 disposed between the rotor cores 220 to generate a magnetic flux, a plurality of rotor cores 220, And a molding part (not shown) for supporting the plurality of permanent magnet blocks 400. 7 and 8 show the rotor 200 omitted from the molding part.

The permanent magnet block 410 includes a plurality of permanent magnets 410, 420 and 430. The plurality of permanent magnets 410, 420 and 430 include a first permanent magnet 410, a second permanent magnet 420 and a third permanent magnet 430, .

The first permanent magnets 410 and the second permanent magnets 420 and the third permanent magnets 430 are arranged along the radial direction of the rotor 200 as magnets having different magnetic performance characteristic values from each other. Also, the permanent magnet block 400 is magnetized along the circumferential direction, and two adjacent permanent magnet blocks 400 are magnetized so that the same polarity faces each other.

For example, in FIG. 8, two adjacent permanent magnet blocks 400a and 400b are magnetized such that their N poles face each other. It is easy to see that the N pole or the S pole of the permanent magnet block 400 is composed of the first permanent magnet 410, the second permanent magnet 420 and the third permanent magnet 430.

The reason why the permanent magnet block 400 is formed by arranging the plurality of permanent magnets 410, 420 and 430 having different performance characteristic values along the radial direction of the rotor 200 is to prevent the permanent magnet block 400 from potatoing.

Particularly, unlike the first embodiment of the present invention, the three permanent magnets are used in the second embodiment of the present invention because the area of the permanent magnet block 400 located close to the stator 100 in the magnetic flux concentrating motor This is because not only the area at the radially outer end but also the area at the radially inward end, which is the area distant from the stator 100, of the area of the permanent magnet block 400, can occur.

That is, in the motor of the second embodiment of the present invention, the area of the permanent magnet block 400 in which the third permanent magnets 430 are arranged is prevented from being reduced. Of course, the potato in this area is relatively less affected than the area in the radially outer end, which is the area located close to the stator 100, and therefore, preventing the potatoes from changing the design specification of the rotor core 200 It can be possible.

Meanwhile, in the motor of the second embodiment of the present invention, the third permanent magnet 430 uses permanent magnets having a larger value of the intrinsic coercive force, which is a performance characteristic indicating the potato force as compared with the first permanent magnet 410. As described above, since the area where the third permanent magnets 430 are disposed is less influenced by the potato than the area where the second permanent magnets 420 are disposed, the third permanent magnets 430 are arranged on the second permanent magnets 430, A permanent magnet having a small value of the intrinsic coercive force may be used.

Also, as in the first embodiment, the first permanent magnet 410, the second permanent magnet 420, and the third permanent magnet 430 may all be ferrite magnets, and the same kind and the same class of permanent magnets The residual magnetic flux density of the third permanent magnet 430 is smaller than that of the first permanent magnet 410 and may be larger than that of the second permanent magnet 420. [

9, the intrinsic coercivity value and the residual magnetic flux density value of the first permanent magnet 410, the second permanent magnet 420, and the third permanent magnet 420 are denoted by iHc1, iHc2, iHc3 and Br1, Br2 and Br3, the relationship of iHc1 <iHc3 <iHc2 and Br2 <Br3 <Br1 can be established.

In the graph of FIG. 9, x represents the intrinsic coercive force, y represents the residual magnetic flux density, M1 represents the performance characteristic value of the first permanent magnet 410, M2 represents the performance characteristic value of the second permanent magnet 420 And M3 represents the performance characteristic value of the third permanent magnet 430. [

With the above structure, the output of the permanent magnet block 400 can be prevented from being reduced while the output of the permanent magnet block 400 is minimized, and a structure for preventing the magnetization of the permanent magnet block 400 at an equivalent cost level can be realized.

Although the technical idea of the present invention has been described above with reference to specific embodiments, the scope of rights of the present invention is not limited to these embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents.

1: Washing machine 10: Cabinet
11: inlet 12: door
20: tub 21: rear wall of the tub
22: fastening hole 30: drum
40: motor 50: water pipe
55: connector 60: detergent feeder
70: drain pump 75: drain pipe
80: drive shaft 82: bearing housing
84: bearing 100: stator
101: stator body 102: stator teeth
103: fastening hole 110: first insulator
111: first insulator body 112: first insulator tooth
113: first fastening hole 114: connector
115: connector housing 116: connecting terminal
120: second insulator 121: second insulator body
122: second insulator tooth 123: second fastening hole
130: stator core 131: core body
132: core teeth 140: coil
200: rotor 220: rotor core
221: first potato preventing protrusion 222: second potato preventing protrusion
223: first coupling hole 224: second coupling hole
230: molding part 231:
232: heat outlet 300, 300a, 300b: permanent magnet block
310: first permanent magnet 320: second permanent magnet
400, 400a, 400b: permanent magnet block 410: first permanent magnet
420: second permanent magnet 430: third permanent magnet
S: fastening member

Claims (10)

A stator having a stator core in which coils are wound, a stator for forming a rotating system when a current is applied to the coils; And
A plurality of rotor cores and a plurality of permanent magnet blocks alternately arranged along the circumferential direction, the plurality of permanent magnet blocks being magnetized such that the same polarity faces each other; Lt; / RTI &gt;
Wherein the permanent magnet block includes a plurality of permanent magnets having different intrinsic coercive force (iHc) values and residual magnetic flux density (Br) values. The method according to claim 1,
And the plurality of permanent magnets are arranged along the radial direction. The method according to claim 1,
Wherein the permanent magnet block includes a first permanent magnet and a second permanent magnet disposed closer to the stator than the first permanent magnet,
The intrinsic coercivity value iHc2 of the second permanent magnet is larger than the intrinsic coercive force value iHc1 of the first permanent magnet,
And the residual magnetic flux density Br2 of the second permanent magnet is smaller than the residual magnetic flux density Br1 of the first permanent magnet. The method of claim 3,
Wherein the permanent magnet block further comprises a third permanent magnet disposed farther away from the stator than the first permanent magnet,
Wherein the intrinsic coercivity value iHc3 of the third permanent magnet is greater than the intrinsic coercivity value iHc1 of the first permanent magnet and less than the intrinsic coercivity iHc2 of the second permanent magnet,
Wherein the residual magnetic flux density value Br3 of the third permanent magnet is smaller than the residual magnetic flux density Br1 of the first permanent magnet and is greater than the intrinsic coercivity value iHc3 of the second permanent magnet. The method according to claim 1,
Wherein the permanent magnet block is magnetized in a circumferential direction, the plurality of permanent magnets are arranged along a radial direction,
And the N pole and the S pole of the permanent magnet block each comprise the plurality of permanent magnets. The method according to claim 1,
Wherein each of the plurality of permanent magnets is a ferrite magnet. The method according to claim 1,
Wherein the plurality of permanent magnets have mutually different composition ratios. A stator having a stator core in which coils are wound, a stator for forming a rotating system when a current is applied to the coils; And
A rotor in which a plurality of rotor cores and a plurality of permanent magnet blocks are alternately arranged along the circumferential direction, the permanent magnet block being magnetized in a circumferential direction so as to concentrate magnetic fluxes of the same polarity; Lt; / RTI &gt;
Wherein the permanent magnet block includes a first permanent magnet and a second permanent magnet disposed closer to the stator than the first permanent magnet and having an intrinsic coercive force (iHc) value larger than that of the first permanent magnet. . 9. The method of claim 8,
Wherein the permanent magnet block further comprises a third permanent magnet disposed farther away from the stator than the first permanent magnet and having an intrinsic coercive force (iHc) value larger than that of the first permanent magnet. main body;
A tub disposed inside the main body for storing wash water;
A drum disposed inside the tub and rotatably supported by the driving shaft; And
A motor mounted on the tub for rotating the driving shaft; Lt; / RTI &gt;
The motor includes:
A stator having a stator core in which coils are wound, a stator for forming a rotating system when a current is applied to the coils; And
A plurality of rotor cores and a plurality of permanent magnet blocks alternately arranged along the circumferential direction and the permanent magnet block being magnetized in a circumferential direction so as to concentrate magnetic fluxes of the same polarity; Lt; / RTI &gt;
Wherein the permanent magnet block includes a plurality of permanent magnets having different values of the residual magnetic flux density (Br) value and the intrinsic coercive force (iHc).

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