KR20190039018A - washer - Google Patents

Abstract

Provided is a compact washing machine capable of improving detergency and shortening cleaning time. The drum 30 is rotatably received in the water tub 20 provided inside the housing 10 with the inlet 12 facing the opening. A pulsator (40) having a projection (45) extending in the radial direction is rotatably installed at the bottom of the drum (30). The control device 60 controls the driving device 50 to rotate the pulsator 40 and the drum 30 relative to each other.

Description

washer

The present invention relates to a washing machine.

Household washing machines can be roughly divided into a top loading type washing machine and a front loading type washing machine (drum type washing machine).

Generally, a top loading type washing machine has a structure in which a drum disposed in a vertically arranged water tank receives laundry and a sufficient amount of washing water, and the laundry is stirred by the water stream generated by stirring the received washing water with a pulsator (stirring blade) And is configured to be washed. (This type of washing can be called "sucking" mode.)

In recent years, the amount of washing water has been reduced even in a top loading type washing machine, but a drum type washing machine is advantageous in terms of water saving due to the difference in the washing method.

That is, the drum type washing machine is constructed such that the drum in the water tray arranged in the lateral direction receives the laundry and a small amount of the washing water, and the laundry is washed by the mechanical action of the laundry being lifted and dropped by the rotation of the drum. (This washing method can be referred to as a "tapping-sucking" method.) Therefore, the drum washing machine can easily reduce the amount of washing water because the amount of washing water is not so important when compared with a top loading washing machine .

When the laundry is washed with a small amount of water (water amount), it is important to increase the fluidity of the laundry so as to bring the washing water evenly into contact with the entire laundry and to improve the mechanical action, in order to improve the washing power and shorten the washing time. In particular, since the drum type washing machine of Europe and America (ie, Europe and the United States) generally carries out less water than the Japanese drum type washing machine (the amount of water, apparently the laundry which is submerged in the washing water is small), the above- It is becoming.

On the other hand, the magnitude of the mechanical action of the drum type washing machine is largely determined by the inner diameter of the drum (usually set by the specifications of the washing machine) due to the fall of the laundry, and therefore it is not easy to strengthen it. It is conceivable to increase the number of revolutions of the drum to increase the frequency of dropping. However, even in this case, when the number of revolutions increases, the laundry adheres to the drum and does not fall down.

In addition, in recent years, with the increase in the capacity of the washing machine, there is a tendency that a large amount of laundry is put into the drum. As a result, the laundry is hardly dropped and the mechanical force is not sufficiently applied to the laundry. Therefore, as a countermeasure thereto, the washing time is increased by increasing the immersion time in the washing water to secure the washing performance have.

Accordingly, there has been proposed a drum type washing machine which is devised to improve the fluidity of the laundry of a top loading type washing machine. (Patent Documents 1 and 2)

In the drum type washing machines of Patent Documents 1 and 2, a drum is composed of a main drum and a sub-drum having a peripheral wall that is shorter than the main drum, and sub-drums are provided so as to overlap the main drum. By rotating the main drum and the sub drum in different rotation speeds or rotation directions, rotation in the vertical axis direction due to the deviation of the rotation speed at the boundary portion between the main drum and the sub drum occurs in addition to the rotation in the transverse direction accompanying the sucking and sucking So that the laundry flows more three-dimensionally.

A washing machine provided with a motor that rotates a rotary drum and an agitator around the same rotary shaft through a shaft having a double shaft structure is disclosed in, for example, Patent Document 3.

The washing machine is provided with a motor (dual motor) in which an inner rotor and an outer rotor are disposed inside and outside one stator. In the washing machine, a dual shaft shaft (double shaft) for connecting the inner rotor and the outer rotor is used. The double shaft is composed of a hollow outer shaft connected to the rotating tank and an inner shaft rotatably inserted into the outer shaft and connected to the stirring body. The inner shaft is fixed to the outer rotor, and the outer shaft is fixed to the inner rotor.

There is known a drum type washing and drying machine in which a step-up circuit is provided in an inverter circuit for driving a motor in order to prevent a power supply voltage from lowering in a dewatering or drying step requiring a large electric power. (Patent Document 4)

The drum type washing and drying machine disclosed in Patent Document 4 includes a drum motor for rotating the drum as a motor with high power consumption, and a compressor motor for air drying. These motors can be stably controlled by boosting the voltage supplied to the inverters for the drum motors and the inverters for the compressor motors depending on the situation.

Patent Document 1; US2013 / 0111676 A1

Patent Document 2; Japanese Patent Publication No. 2014-530741

Patent Document 3; Japanese Patent Laid-Open No. 11-276777

Patent Document 4; Japanese Patent No. 5097072

In the case of the washing machines of Patent Documents 1 and 2, the force for generating the rotation in the longitudinal direction is generated by the laundry on the bottom side in the front-rear direction middle portion of the drum where the boundary portion of the main drum and the sub- The laundry located in the front portion or the rear portion of the drum or the laundry thereon tends to be easily retained.

In the washing machines of Patent Documents 1 and 2, a plurality of lifters (stirring blades) extending in the front-rear direction are provided on the inner peripheral wall of the main drum or the sub drum to facilitate the flow of the laundry. However, when both lifters approach the boundary, There is a risk of damage or ingrowing. Therefore, it is necessary to arrange both lifters at a certain distance, and there is a limit to promotion of rotation in the longitudinal direction by the lifter. Therefore, the tendency of the laundry to remain still remains.

Further, since it is necessary to rotationally drive a relatively large sub-drum in addition to the main drum, the structure and driving mechanism of the drum are complicated and not only large-sized but also running cost is increased.

Further, since the sub-drums are disposed in the main drum, it is necessary to provide a predetermined gap between the main and sub-drums. Therefore, in order to cope with the recent increase in the capacity of the washing machine, it is necessary to increase the size of the drum. However, if this is done, the whole product becomes large, installation is difficult, and the cost becomes high.

It is therefore an object of the present invention to provide a compact washing machine capable of imparting a strong mechanical action and a great fluidity to a laundry while having a relatively simple structure by employing the operation of a new mechanism, .

The present invention relates to a washing machine.

The drum is rotatably housed in a bottom portion of the drum. The drum is rotatably received in a state in which the opening is directed to the inlet. The drum is rotatably mounted on the bottom of the drum. A pulsator having a protrusion extending in a radial direction, a driving device for driving the drum and the pulsator, and a control device for controlling the driving device, wherein the control device controls the driving device And is configured to relatively rotate the pulsator and the drum.

According to this washing machine, for example, when the amount of the washing water is reduced so that only a part of the laundry is immersed, the mechanical force of the relatively rotating drum and the projecting portion of the pulsator can be combined and acted on the laundry. That is, when the pulsator rotates relative to the drum when the rotational speed of the drum is set to be high and the laundry is slightly fixed by the centrifugal force, the laundry is slightly fixed to the drum so that the protrusions hit the laundry, .

Further, there is no need to provide an unnecessary gap between the pulsator and the drum, and the garment enters into the gap, thereby improving the washing performance. As a result, the drum capacity can be increased, and thus it is possible to cope with the recent increase in the capacity of the washing machine.

In the case of a drum type washing machine, the transferred laundry detaches from the drum, collides with the rotating pulsator, and is pushed forward while receiving the mechanical force again. At this time, the laundry moves while attracting laundry around it. Thus, it is possible to obtain a conventional tapping action and a friction action by the movement of the laundry. By mixing the laundry, washing irregularities can be reduced.

In the case of a top loading type washing machine, the laundry transferred from the drum comes off from the drum and is pushed upwards while receiving the mechanical force by colliding with the rotating pulsator. At this time, the laundry moves while attracting laundry around it. As a result, even if the conventional sucking action is not obtained, a tapping sucking action in the drum type washing machine and a friction action due to the movement of the laundry can be obtained. By mixing laundry, washing irregularities can be reduced.

According to the washing machine of the present invention, the washing power can be improved and the washing time can be shortened.

1 is a schematic sectional view of a washing machine of an embodiment.
2 is an enlarged view of the main part of Fig.
3A is an exploded perspective view of a main part of a washing machine.
Fig. 3B is an assembly explanatory diagram of a portion surrounded by a chain double-dashed line in Fig. 2;
3C is a partial cross-sectional view showing a preferred example of the washing machine.
4 is a schematic perspective view of the pulsator.
5 is a cross-sectional view taken along the line II in Fig.
Figure 6 is a schematic side view of the pulsator.
7 is a view for explaining a washing method.
8 is a view for explaining a washing method.
9 is a schematic diagram showing another form of pulsator.
10 is a block diagram showing a main part of functions of the controller.
11 is a plan sectional view showing the configuration of the motor. And the number of magnetic poles of the outer rotor is 32 poles.
12 is a circuit diagram showing the configuration of the inverter.
13 is a plan sectional view showing the movement path of the magnetic flux.
14 is a plan sectional view showing the configuration of the motor. And the number of magnetic poles of the outer rotor is 16 poles.
15 is a plan sectional view showing a moving path of the magnetic flux.
16 is a diagram showing a BH curve when a magnet having a coercive force different from that of the stationary magnet and the switching magnet is used.
17 is a view for explaining a rotation mode when the number of poles of the outer rotor is 32 poles.
18 is a diagram for explaining a rotation mode when the number of poles of the outer rotor is 16 poles.
19 is a plan sectional view showing a configuration of a motor according to a modification 1; And the number of magnetic poles of the outer rotor is 32 poles.
20 is a plan sectional view showing the configuration of the motor. And the number of magnetic poles of the outer rotor is 16 poles.
21 is a plan sectional view showing the configuration of a motor according to a second modification.
22 is a plan sectional view showing the configuration of a motor according to a third modification.
23 is an enlarged longitudinal sectional view showing an upper end portion of the double shaft.
24 is an enlarged vertical cross-sectional view showing a lower end portion of the double shaft.
25 is an exploded perspective view showing a mounting structure of a retaining ring for an outer shaft.
26 is a schematic sectional view showing a main part of a double shaft according to a modification.
27 is a schematic perspective view showing a fixture.
28 is a schematic sectional view showing the main part of the motor in the washing machine of the application example.
29 is a block diagram showing a power supply circuit in a washing machine of an application example.
30 is a diagram for explaining the generation timing of the magnetizing current in the washing machine of the application example.
31 is a schematic view showing an example of application to a washing machine of a top loading type.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely exemplary in nature and is not intended to limit the invention, its application, or its use.

<Basic configuration of washing machine>

1 and 2 show a washing machine (drum washing machine) 1 of the present embodiment. The washing machine 1 is composed of a housing 10, a water tank 20, a drum 30, a pulsator 40, a motor 50, a driving device, a controller 60, , And dewatering can be automatically performed in accordance with the set program (electromagnetism). Particularly, in the washing machine 1, since the motor 50 can be designed and a compact size can exhibit appropriate performance according to each processing of the washing machine 1, the motor 50 will be described in detail separately.

The housing 10 has a rectangular box shape having an upper face portion 10a, a lower face portion 10b, a pair of left and right side face portions 10c, a front face portion 10d, and a rear face portion 10e. A circular inlet 12 is formed at the substantially center of the front surface portion 10d so as to be opened and closed by the door 11. The laundry is put in and out through the inlet 12. An operation portion 13 having a switch or the like is provided on the upper portion of the front surface portion 10d, and a controller 'is built in the rear thereof.

The water tank 20 is a bottomed cylindrical container having an opening 20a having a diameter smaller than the inner diameter at one end thereof. The opening 20a is directed toward the inlet port 12, And is disposed inside the housing 10 in a state of being horizontally arranged so as to extend to the housing 10. At the time of washing or rinsing, washing water or rinsing water collects in the lower part of the water tank 20. [

The drum 30 is a bottomed cylindrical container having an opening 30a at one end and a bottom at the other end and is housed in the water tub 20 with the opening 30a facing forward . The opening 30a has an inner diameter smaller than that of the body portion of the drum 30 (a portion of a wrapper 33 (described later)). The drum 30 is rotatable around a rotation axis J extending in the front-rear direction. In the state in which the laundry is contained in the drum 30, each stroke such as washing, rinsing, and dehydration is performed.

4 to 6, the pulsator 40 is a disk-like member having a front conical front with a low head top, and a radially extending projection 45 on its front face The pulsator 40 installed is disposed at the bottom of the drum 30. [ The pulsator 40 is rotatable about the rotation axis J independently of the drum 30.

2, the double shaft 70 composed of the inner shaft 71 and the outer shaft 72 is installed in the state of passing through the bottom surface of the water tank 20 around the rotation axis J . The outer shaft 72 is a cylindrical shaft whose axial length is shorter than that of the inner shaft 71. The inner shaft 71 is rotatably supported inside the outer shaft 72 through an inner bearing 73. The outer shaft 72 is rotatably supported by a bearing housing 23a of the water tub 20 through an outer bearing 74. [

The drum 30 is connected to and supported by the upper end of the outer shaft 72 and the pulsator 40 is connected to and supported by the upper end of the inner shaft 71. The outer shaft 72 and the inner shaft 71 are connected to a motor 50 disposed on the rear side of the water tray 20.

The motor 50 independently drives the outer shaft 72 and the inner shaft 71, respectively. The controller 60 includes hardware such as a CPU and a memory and software such as a control program to comprehensively control the washing machine 1. The controller 60 controls the washing machine 1 in accordance with instructions input from the operating unit 13, And automatically operates each stroke of the motor.

<Detailed Configuration of Washing Machine 1>

3A, the drum 30 includes an annular drum front 31 formed with an opening 30a, a drum front 31, a toroidal drum 32 opposed to the front and back, And a cylindrical wrapper 33 for connecting the front 31 and the drum bag 32 to each other.

The wrapper 33 is provided with a plurality of water holes 33a passing through the inside and outside of the drum 30. The washing water collected in the water tray 20 flows into the drum 30 through these water holes 33a. Each of the water supply holes 33a has a substantially burring shape and protrudes in a spherical shape on the inner surface side of the drum 30. The water supply hole 33a is not limited to the wrapper 33 and may be formed in the drum front 31, the drum bag 32, or the pulsator 40.

The drum front 31 and the wrapper 33 are integrally or detachably connected by press fastening or screw fastening. The wrapper 33 and the drum bag 32 are also integrally or detachably connected by pressure tightening, screwing, or the like.

The drum 30 is fixed to the outer shaft 72 through a disc-shaped flange shaft 34 (flange member) attached to the bottom of the drum 30. The flange shaft 34 and the outer shaft 72 may be integrated with the outer shaft 72 by inserting the outer shaft 72 into the flange shaft 34 with an emphasis on the efficiency in assembling the flange shaft 34 and the outer shaft 72, The outer shaft 72 may be formed by insert molding.

When the flange shaft 34 is integrated with the drum 30, it is preferable that the flange shaft 34 is fastened by screws or the like on the outer peripheral side of the wrapper 33 for easy assembly. When the drum 30 is constituted by a plurality of parts, it is preferable that the bent portion of the drum bag 32 be inserted between the wrapper 33 and the flange shaft 34 and fastened together. The drum bag 32 may be fixed to the flange shaft 34 and then assembled, and then the wrapper 33 and the flange shaft 34 may be combined.

In the washing machine 1, the assembly of the drum 30 and the flange shaft 34 is constituted as described above. Details thereof are shown in Fig. 3B. The wrapper 33 and the drum bag 32 are generally formed by bending or pressing a metal plate. The annular drum front 31 and the drum back 32 are installed and integrated in the inner edge portion of the front end portion and the inner edge portion of the rear end portion of the cylindrical wrapper 33 so that the strength and rigidity .

The drum bag 32 has a cylindrical outer fitting portion 32a and an annular flange portion 32b protruding inward from the front end portion of the outer fitting portion 32a. The annular flange portion 32b has a bulging portion 32c that is gradually inclined forward and bulges toward the front side of the annular flange portion 32b. And a rear side opening portion 32d to be opened is formed.

The outer diameter of the outer fitting portion 32a is substantially the same as the inner diameter of the wrapper 33 and the wrapper 33 is fitted to the outer fitting portion 32a. The inner diameter of the outer fitting portion 32a is substantially the same as the outer diameter of the outer end face of the flange shaft 34 and the outer fitting portion 32a is fitted to the outer end face of the flange shaft 34. [ The inner end surface (cylindrical portion) of the swollen portion 32c is slightly larger than the outer diameter of the pulsator 40 and faces the outer peripheral portion of the pulsator 40 with a slight gap.

Outer insertion through holes 33b are formed at a plurality of positions in the rear end portion of the wrapper 33. [ A plurality of inner insertion through holes 32e are also formed in the outer fitting portion 32a so as to overlap each of these outer insertion holes 33b. In addition, fastening holes 34a overlapping these outer insertion through holes 33b and the inner insertion through holes 32e are formed at a plurality of locations on the outer end face of the flange shaft 34. [

3B, at the time of assembling the wrapper 33, the drum bag 32, and the flange shaft 34, the drum bag 32 is first inserted into the outer peripheral surface of the flange shaft 34 so that the outer fitting portion 32a is fitted to the outer peripheral end surface And is fitted and fixed to the flange shaft 34. Thereafter, the rear end of the wrapper 33 is fitted into the outer fitting portion 32a, and fastener (s) is inserted into each of the outer insertion through hole 33b, the inner insertion through hole 32e and the fastening hole 34a, Member) T from the outside in the radial direction. By doing so, the wrapper 33, the drum bag 32, and the flange shaft 34 are combined and integrated.

As described above, the flange shaft 34 having excellent strength and rigidity is formed to have a large diameter which is substantially equal to the diameter of the wrapper 33 (i.e., the drum 30), and the wrapper 33, The drum 30 can be stably supported even if the drum 30 is rotated and rotated in the lateral direction.

For reference, in a conventional washing machine, whether the drum is a top loading type or a drum type, the diameter of the flange shaft is sufficiently smaller than the diameter of the drum, and the drum is generally fastened to the flange shaft from a direction in which the rotary shaft extends through the drum bag.

The drum bag 32 and the flange shaft 34 may be fastened by screwing or the like from the front side of the wrapper 33 instead of from the outer circumferential side of the wrapper 33 when the drum 30 is constituted by a single part good.

When the flange shaft 34 and the outer shaft 72 are not integrated by insert molding or press fitting or the like, a serration (not shown) is formed at a connection portion between the flange shaft 34 and the outer shaft 72, ), Or a concave-convex engagement by a key groove and a key groove, so as to restrict the rotation in the rotational direction. The flange shaft 34 and the outer shaft 72 are pulled out and fitted together so as to be in an unrotatable state and then they are tightened from the axial direction by a nut or bolt to regulate the axial movement.

The inner bearing 73 may be a ball bearing or a sliding bearing. The inner shaft 73 is press-fitted into one of the outer shaft 72 and the inner shaft 71 and the other of the outer shaft 72 and the inner shaft 71 is fixed to the inner bearing 73 are loosely fitted. One of the ends of each of the outer shaft 72 and the inner shaft 71 has a stepped portion having a size different from the outer diameter of the main shaft portion by forming a flange or mounting a snap ring, And is fixed in contact with the bearing 73. A washer or the like may be interposed between the outer shaft 72 and the inner shaft 71 and the inner bearing 73.

The outer shaft 72 and the other end of each end of the inner shaft 71 may be fixed with a snap ring or the like in order to prevent misalignment or dropout during transportation. It is also acceptable to install a washer or the like on this side. A seal member is mounted on an end of the double shaft 70 on the water tank 20 side to prevent the infiltration of the washing water into the double shaft 70 or the leakage of water to the outside of the water tank 20 through the double shaft 70 (Waterproof structure).

The water tank 20 is composed of two or more parts. The water tub 20 may be divided into upper and lower parts or right and left parts. However, the most effective part of the water tub 20 is divided into two parts in the forward and backward directions. A water tank 20 is constituted. It is necessary to provide a seal structure for preventing water leakage at the joint portion of the water tank 20. [

An opening 20a is formed in the front end of the tab front 22. At the rear end of the tab bag 23, a bearing housing 23a is provided. The tab bag (23) and the bearing housing (23a) are made of different materials. The tab bag 23 and the bearing housing 23a may be formed as separate parts and the bearing housing 23a may be fixed to the tab bag 23 with a bolt or the like.

Therefore, it is preferable that the bearing housing 23a and the tab bag 23 are integrally formed by insert molding. The tab bag 23 and the bearing housing 23a may be made of the same material and integrally formed. However, in the case of aluminum die casting, it is not practical in terms of weight, size, and cost. In the washing machine 1, the bearing housing 23a (made of aluminum die cast) and the tab bag 23 (made of resin) are formed by insert molding As shown in Fig.

The bearing housing 23a has a shaft support portion 24 for supporting an outer shaft 72 through an outer bearing 74. [ The bearing housing 23a may also be composed of two or more parts. The outer shaft 72 is pivotally supported via two or more outer bearings 74 spaced axially apart from the bearing housing 23a. These outer bearings 74 are pushed into either the outer shaft 72 and the bearing housing 23a and the other of the outer shaft 72 and the bearing housing 23a is pushed into the outer bearing 74 ).

The outer shaft 72 is integrally formed with the flange shaft 34 so as to extend from the front of the tab bag 23 in the cylindrical shape formed at the center of the bearing housing 23a And can be inserted into the shaft support portion 24 of the base member 20. The outer shaft 72 may be inserted into the shaft support portion 24 from the rear of the tab bag 23 when the outer shaft 72 is separate from the flange shaft 34. [

When the outer shaft 72 is loosely fitted to the outer bearing 74, the outer shaft 72 has the same outer diameter over the entire length, or the outer diameter of the insertion start side is larger than the outer diameter of the insertion end side It must be small. On the other hand, when the outer bearing 74 press-fitted into the outer shaft 72 is loosely fitted to the shaft support 24, the shaft support 24 is at least equal to the inner diameter of the outer bearing 74, The inner diameter of the starting side position must be larger than the inner diameter of the insertion end side. The present invention is not limited to the case where the bearing housing 23a is constituted by two or more parts. It is preferable that the size of the outer bearing 74 on the front side of the outer bearing 74 on the rear side is larger than the size of the outer bearing 74 on the rear side so that the tab can be inserted and stably supported from the front side of the tab bag 23.

4, the pulsator 40 has a boss portion 41 located at the center thereof and a disk portion 42 located around the boss portion 41. As shown in Fig. 2, Similarly, the boss portion 41 is fixed to the projecting end portion of the inner shaft 71. Rotation between the boss portion 41 and the inner shaft 71 is restricted in rotation in the rotational direction by serration or concavo-convex fitting of a key or the like (rotation preventing structure).

In terms of strength, it is preferable that the boss portion 41 and the disk portion 42 are made of two or more parts having different materials. When the disc portion 42 and the boss portion 41 are made of the same material, the strength is reduced. That is, a metal having a high strength such as aluminum or stainless steel increases the weight of the pulsator 40, which increases the inertial force and increases the energy loss. Therefore, it is difficult to employ the metal, and when a resin or the like is used, the decrease in durability There is a possibility of causing it.

Therefore, it is most effective that the boss portion 41 is made of a strength member such as stainless steel to a minimum size and the disk portion 42 is formed of a light-weight resin or the like. The boss portion 41 is fixed to the disk portion 42 by press-fitting, insert molding, or the like. The front surface of the disk portion 42 may be in the form of a resin or the like, but may be covered with a thin plate of stainless steel or the like in order to prevent appearance or cut-off.

Further, although the cost is high, the disk portion 42 may be formed of a stainless steel plate. When the disk portion 42 is formed of a resin or the like, the thickness of the resin is required to be about 3 to 5 mm in order to secure a constant strength, but in the case of a stainless steel plate, the plate thickness can be set to about 1 mm. By doing so, it is possible to further increase the capacity.

The boss portion 41 is inserted into the protruding end portion of the inner shaft 71 by engaging with the concave-convex fitting portion so as to be plugable, and is prevented from being pulled out by fastening by a bolt or a nut. A protective cap 43 (protection component) is mounted on the top of the boss 41 to prevent the laundry from being damaged by the fastening portion. A labyrinth structure is used in the gap between the pulsator 40 and the drum 30 so as to surround the pulsator 40 at a small interval to prevent the laundry from being attracted. The labyrinth structure is generally formed by a drum bag 32 and a pulsator 40. Therefore, the outer diameter of the pulsator 40 is preferably less than 100% of the inner diameter of the drum 30, and preferably 60% or more.

If the outer diameter of the pulsator 40 is 60% or more of the inner diameter of the drum 30, the function of the pulsator 40 such as stirring can be appropriately exerted inside the drum 30.

In particular, the outer diameter of the pulsator 40 is preferably smaller than the inner diameter of the opening 30a. Since the pulsator 40 can be inserted into the drum 30 through the opening 30a, it is possible to assemble the pulsator 40 to the drum 30 after the drum 30 is assembled, This is simple. In addition, if a problem occurs in the pulse device 40 due to the user's use for a long period of time, the replacement of the parts becomes easy and the cost burdened by the user at that time can be reduced.

On the other hand, when the outer diameter of the pulsator 40 is larger than the opening 30a, the pulsator 40 is inserted into the drum 30 from behind. In this case, it is necessary to insert the pulsator 40 into the drum 30 before the work of integrating the wrapper 33 and the drum bag 32 by pressing, welding or the like, but the manufacturing process becomes troublesome It is not realistic.

The pulsator 40 is fixed to the inner shaft 71 via the flange shaft 34 or the wrapper 33 and the drum bag 32 are fixed before the wrapper 33 and the drum bag 32 are integrated, To be detachable by screwing or the like.

The labyrinth structure is formed by three or more parts including the drum bag 32 and the pulsator 40 plus the flange shaft 34 so that the drum bag 32 and the wrapper 33 are integrated after the pulsator 40 can be assembled. That is, the drum bag 32 constitutes a wall that covers the outside of the pulsator 40, and a wall that covers the back side and the inside of the pulsator 40 with the flange shaft 34 and other components It is possible to carry out.

However, in order to avoid an increase in the number of parts, it is preferable that the wall covering the back side and the inside side of the pulsator 40 is constituted by the flange shaft 34. [ The outer wall of the pulsator 40 may be formed of a flange shaft 34 or the like instead of the drum bag 32. In this case, a gap is formed in the vicinity of the inner surface of the drum 30, The drum bag 32 is preferable.

In the washing machine 1, the labyrinth structure is configured in this way. Fig. 3C shows an example of the gravure rinse structure in detail.

A portion constituting the rear side opening portion 32d of the drum 30 is formed so as to smoothly connect with the outer peripheral portion of the pulsator 40 (the rim portion of the sloped surface portion 44 described later) Bulging portion 32c is formed. In other words, the outer peripheral front end portion of the inclined surface portion 44 and the front end portion of the swollen portion 32c are disposed at substantially the same position in the direction in which the rotary shaft J extends.

An annular rib 34c protruding in a concentric manner is formed on the outer peripheral portion of the front surface of the flange shaft 34. [ On the other hand, on the back surface of the outer peripheral portion of the pulsator 40, an annular concave portion 37 having a substantially same diameter as that of the annular rib 34c is formed concentrically. The annular rib 34c is accommodated in the annular recess 37 in a noncontact state by attaching the pulsator 40 to the double shaft 70 coupled to the flange shaft 34. [

The inner end surface of the swollen portion 32c which is the inner peripheral portion of the drum bag 32 constitutes a wall that covers the outer side of the pulsator 40. The front surface of the annular rib 34c and the front surface of the flange shaft 34 A wall covering the back side and the inside of the pulsator 40 is constituted by the pulsator 40 and the drum bag 32 and the flange shaft 34 of the pulsator 40 constitute a complicatedly shaped micro gap labyrinth (R) structure).

Even if the outer diameter of the flange shaft 34 is made larger than the outer diameter of the pulsator 40 by installing the labyrinth structure R, the laundry may be entrained between the pulsator 40 and the drum 30 It is possible to prevent foreign matter from entering between the pulsator 40 and the flange shaft 34.

<Motor 50>

The inner shaft 71 and the outer shaft 72 are connected to a motor 50 serving as a driving device. The motor 50 may be any of the following types, or a combination thereof. For reference, the motor 50 of the washing machine 1 of the present embodiment is type 1.

(Type 1)

In the type 1 motor 50, an inner rotor 52 and an outer rotor 53 are disposed on the inner side and the outer side of one stator 51 (a dual motor). The inner rotor 52 is connected to the outer shaft 72 and the outer rotor 53 is connected to the inner shaft 71. [ And drives and controls the two rotors 52 and 53 with one inverter. The motor 50 will be described later in more detail separately.

(Type 2)

And is a dual motor such as Type 1, and drives and controls two rotors 52 and 53 by two inverters. In this motor, since the rotors 52 and 53 can be individually driven and controlled by the inverter, the ratio of the number of rotations can be adjusted and the number of rotations of the rotors 52 and 53 can be freely controlled .

(Type 3)

The inner stator is not a single stator but a stator having two inner stator and two outer stator structures arranged in a front-to-back relationship. An inner rotor and an outer rotor are disposed on the inner and outer sides of the double stator structure, respectively. This motor is the same as a case in which two functionally independent motors are arranged side by side around the rotation axis J. In the case of this motor, two rotors are individually driven and controlled by two inverters.

(Type 4)

Two motors are arranged in the direction in which the rotation axis J extends and integrated. The rotor of the front side motor close to the tab bag 23 is connected to the outer shaft 72 and the rotor of the rear side motor is connected to the inner shaft 71. [ These motors are individually driven and controlled.

(Type 5)

It is a normal motor and two motors are used. However, unlike the motor of the direct drive type described above, each of the drums 30 and pulsator 40 is rotationally driven by each motor through a power transmitting mechanism including a shaft, a pulley, and an endless belt.

(Type 6)

In this type, as in Type 5, two normal motors (first motor and second motor) are used. However, the second motor is a direct drive type inner rotor type motor having a rotor inside the stator that rotates about the rotation axis J. A pulley, which rotates about the rotation axis J, is provided outside the stator of the second motor, and an endless belt is tightly installed on the pulley (power transmission mechanism). The first motor is connected to the pulley through the power transmission mechanism. The pulsator (40) is driven by the first motor through the power transmission mechanism, and the drum is driven by the second motor.

When these motors are installed in the tap bag 23 or the bearing housing 23a, it is preferable that the motors are fixed directly to them, but they may be fixed indirectly through brackets or the like. It may be fixed through a bush or the like having elasticity such as rubber or resin for the purpose of blocking the vibration caused by the motor from being transmitted to the tap bag 23 or the like. It is preferable that the fixing is performed by using bolts or nuts, and a washer for widening the range of axial force, a spring washer for preventing loosening, a wave washer and the like may be interposed between these fastening members (members).

<Double shaft (70)>

The double shaft 70 has an inner shaft 71 and an outer shaft 72. The double shaft 70 has a cylindrical shaft portion 24 provided at the center of the bearing housing 23a of the water tub 20, And the center of the shafts coincide with each other.

The inner shaft 71 is an elongated cylindrical shaft member and the outer shaft 72 is an elongated cylindrical shaft member that is shorter than the inner shaft 71 and has an inner diameter larger than the outer diameter of the inner shaft 71. [ to be. A pair of inner bearings 73 and 73 are vertically spaced inside the outer shaft 72. The inner bearing 73 may be a ball bearing or a sliding bearing. The inner shaft 71 is inserted into the outer shaft 72 and is rotatably supported by the inner bearings 73 and 73. [

These inner bearings 73 are press-fitted into either the outer shaft 72 or the inner shaft 71 and the other of the outer shaft 72 and the inner shaft 71 is fixed to the inside And the bearing 73 is loosely fitted.

The front end portion of the inner shaft 71 protrudes from the front end portion of the outer shaft 72 and the rear end portion of the inner shaft 71 protrudes from the rear end portion of the outer shaft 72.

&Lt; Pulse generator 40 >

As shown in Figs. 4, 5 and 6, on the front surface of the pulsator 40, there are formed a gently sloping surface portion 44 which is gradually downwardly inclined from the central boss portion 41 toward the outer peripheral portion, 45 are installed. The gently-slanting surface portion 44 constitutes a disk-shaped base portion spreading on the front surface of the pulsator 40. Each of the projecting portions 45 protrudes so as to rise from the surface of the base portion. In order to reduce the resistance at the time of rotation, the gently-slanting surface portion 44 preferably has a small unevenness and is formed substantially flat. The protrusions 45 extend in the radial direction from the boss portion 41 and are radially arranged at regular intervals in the circumferential direction. If the projecting portions 45 are disposed unevenly, the reaction force is not uniform, which may cause abnormal vibration or the like.

The number of protrusions 45 of the pulsator 40 is three, but the number of the protrusions 45 is preferably two to eight, more preferably two or three in that good results are obtained. An example in which a pulsator having two protrusions 45 is preferable is shown in Fig. In the case of two protrusions 45, each protrusion 45 is arranged to extend from the central boss portion 41 toward the outer peripheral portion in a direction opposite to each other.

If the number of the protrusions 45 is increased, the laundry is less likely to enter between the protrusions 45, so that the effect of tapping or removing the laundry by the protrusions 45 is reduced, and the fluidity of the laundry is also reduced. Therefore, the washing power is lowered and the power consumption is increased.

Small protrusions smaller than the projecting portions 45 may be provided at equal intervals (equidistant intervals) in the portions between the projecting portions 45 in the gently sloped surface portion 44. [ The effect of rubbing the laundry by these small projections is obtained.

The center frequency of the projecting portion 45 in the vicinity of the boss 41 is less than 60% of the rated capacity of the laundry (for example, 60% of the capacity of the drum 30). Therefore, it is preferable that the projecting amount from the gently-slanting surface portion 44 of the center side portion of the projecting portion 45 is small.

On the other hand, the closer to the outer edge of the outer peripheral portion of the protruding portion 45, the higher the influence on the peeling performance of the laundry. Therefore, the outer peripheral portion of the projecting portion 45 preferably has a larger projecting amount from the gently-slanted surface portion 44 than the inner peripheral portion.

However, if the projecting amount of the projecting portion 45 from the gently sloping surface portion 44 is increased, the torque required for rotating the pulsator 40 also increases. When the drum 30 and the pulsator 40 rotate in opposite directions, the force of the projecting portion 45 acts in the direction of canceling the rotation of the drum 30 through the laundry. Therefore, The torque required for the motor is also increased. Therefore, it is not preferable that the projecting amount of the outer peripheral portion of the projecting portion 45 is excessively large.

The shape of the projection 45 is also important. Each protruding portion 45 has a shape extending radially from the center boss portion 41 so as to extend from the gently-slanting surface portion 44 and has a shape of an inverted "U" shape or a reverse "V" Shaped cross section. A plurality of substantially flat inclined surfaces 45a are formed on both sides of the protruding portion 45 in the circumferential direction on the outer circumferential portion.

As shown in Fig. 6, when the inclined surface 45a is viewed from the transverse direction of the projecting portion 45, when the inclination angle [theta] of the inclined surface 45a with respect to the rotation axis J is small Parallel laundry) collides with the inclined surface 45a in front, so that the pulsator 40 may be locked due to the state of the laundry, and may be in a state of rotating as the laundry may be unable to rotate or resist the driving. There is also the possibility of increasing noise or causing abnormal vibration.

Therefore, the inclination angle [theta] of the inclined surface 45a is preferably 15 degrees or more. As the inclination angle? Increases, the rotational resistance of the pulsator 40 also decreases, so that the power consumption is also reduced.

On the other hand, as the inclination angle? Increases, the laundry becomes less likely to be caught, so that the ability to tap or peel off the laundry is deteriorated. Therefore, the inclination angle [theta] of the inclined surface 45a is preferably 20 degrees or less.

In consideration of the balance, it is preferable to form two inclined surfaces 45a having different inclination angles? On the respective side portions of the outer peripheral portion of each projection 45. Specifically, a first inclined surface 45a1 having a relatively large inclination angle? 1 is formed on the top side of the projecting portion 45 and a second inclined surface 45a1 having a relatively small inclination angle? 2 is formed on the bottom side of the projecting portion 45 45a2.

2, the peripheral edge of the pulsator 40 is arranged opposite to the inner peripheral surface of the drum 30 with a certain gap 200 therebetween, and the gap 200 is brought into contact with the laundry to perform a mechanical action It is preferable to provide the action surface 201 to be provided.

As a result, when the drum 30 and the pulsator 40 are rotated in opposite directions during washing, the laundry 200 enters the gap 200, and the three action faces 201 close to each other (concretely, (The inner peripheral surface of the drum 30 facing the drum 200, the bottom surface of the drum 30, and the projecting end surface of the outer peripheral side of the projecting portion 45).

However, when such a gap 200 is provided, when a large amount of laundry is received in the drum 30, depending on the shape of the gap 200, the laundry may be buried in the gap 200 and the laundry may be damaged or overloaded . The size of the gap 200 in the radial direction and the amount of protrusion from the gently sloped surface portion 44 of the protrusion 45 are set to a predetermined condition so as to prevent the laundry from getting into the gap 200 in the washing machine 1 Is satisfied.

Specifically, as shown in Fig. 2, the size of the clearance 200 in the radial direction is represented by DELTA R (unit: mm), and the edge portion of the outer periphery of the protruding portion 45 H / DELTA R &amp;le; 1.0 when the maximum protruding amount from the gently-slanting surface portion 44 in the outer circumferential portion (the outer circumferential portion of the outer circumferential portion) is H (unit: mm).

More specifically, if the projecting amount of the projecting end of the projecting portion 45 is smaller than half of the width of the gap 200, the gap 200 becomes excessively shallower so that the mechanical action is effectively imparted to the laundry It is difficult. On the other hand, if H / AR is larger than 1.0, that is, if the projecting amount of the projecting end of the projecting portion 45 is larger than the width of the gap 200, the gap 200 becomes excessively deep,

On the other hand, even if a large amount of laundry is accommodated in the drum 30 by forming the gaps to satisfy the relational expression, mechanical action can be imparted to the laundry by the action surface 201 while preventing the washing of the laundry, The flow of the laundry can be effectively generated.

(Variation of pulsator 40)

The pulsator 40 may have a substantially conical shape but a concave shape. But may be in the form of a concave bowl like a pulsator of a top loading type washing machine. However, in this case, it is preferable that the outer peripheral portion of the disc portion 42 is located rearward of the boss portion 41. This is because, if the outer peripheral portion of the disk portion 42 protrudes forward, the laundry strikes on that portion, and the weight of the laundry as well as the inertial force due to the enlargement of the pulsator is applied to the pulsator, The torque of the motor is increased.

<Washing method>

In the conventional drum type washing machine, a so-called " tapping sucking " washing method is employed in which laundry is washed by a mechanical action in which the laundry is lifted and dropped by the rotation of the drum. The mechanical strength is almost determined by the diameter of the drum, so hardening of the mechanical strength is difficult.

If the number of revolutions is increased in order to increase the mechanical power, the laundry will not fall on the drum and thus the drum can not be dropped, which makes it impossible to "tap and suck", resulting in a reduction in the mechanical power. Therefore, in order to increase the mechanical force, there is only a method of rapidly repeating the reversal of the drum or the like, but even if the mechanical power is increased, it causes not only a small but also a large energy loss.

On the other hand, in the washing machine 1, the rotational direction of the drum 30 and the pulsator 40 are opposed to each other without employing the "tapping sucking", so that the respective mechanical forces can be synthesized and effectively applied to the laundry.

7, the number of revolutions of the drum 30 at the time of washing is set to be sufficiently higher than that of a conventional drum type washing machine so that the laundry C is adhered to the inner circumferential surface of the drum 30 by centrifugal force For example, 50 rpm to 80 rpm). Then, as shown by a thin arrow in Fig. 8, the pulsator 40 is rotated in the direction opposite to the rotating direction of the drum 30.

At this time, since the laundry C is attached to the inner circumferential surface of the drum 30, the protrusions 45 of the pulsator 40 collide with the laundry C to hit the laundry C, The mechanical force of the data 40 is transmitted. The laundry C is also separated from the drum 30 by a tapped impact or released from the drum 30 directly by the projection 45 without being hit by the projection 45 (Figs. 7 and 8 C1 in Fig.

The laundry C1 collides with the pulsator 40 rotating at the same time and is pushed forward while receiving the mechanical force (C2 in Fig. 7). The laundry C1 detached from the drum 30 by the pulsator 40 moves forward while attracting the laundry therearound. As a result, the same action as that of the conventional " tapping and sucking " can be ensured, and the action of the laundry to be rubbed by the movement of the laundry can also be obtained.

The laundry in the front of the drum 30 moves to the rear of the drum 30 along the inner circumferential surface of the drum 30 because the laundry C2 is pushed forward of the drum 30 C). Therefore, a flow is formed in the drum 30 to circulate the laundry in the front-rear direction while rotating along the inner circumferential surface of the drum 30.

In this way, the mechanical force of the pulsator 40 is transferred to the laundry, and the laundry is subjected to a complicated and three-dimensional flow, thereby reducing washing unevenness. The mechanical strength per unit time given to the laundry also increases, so that improvement in washing power and reduction in washing time can be realized.

The number of revolutions of the drum 30 may be a number of revolutions in which centrifugal force hardly acts on laundry such as 30 rpm. In this case, in addition to the conventional " tap and suck " action, the pulsator 40 can push the laundry forward. However, if the rotational speed of the pulsator 40 is excessively low, the mechanical force is not transferred to the laundry, and the laundry can not be sufficiently moved. Therefore, in this case, the pulsator 40 needs a certain number of revolutions, and is preferably rotated at a rotational speed of 60 rpm or more, for example.

If the rotation of the drum 30 is faster than the pulsator 40, the rotation moment of the laundry is larger than the rotation moment of the pulsator 40, so that the pulsator 40 is subjected to the force of the laundry, There is a possibility that it will not. On the other hand, by accelerating the rotation of the pulsator 40 more than the drum 30, the mechanical force of the pulsator 40 can be stably transmitted to the laundry and a favorable three-dimensional flow can be obtained.

In the washing machine 1, the following pattern operation is possible during the washing cycle.

(Pattern 1)

The drum 30 and the pulsator 40 are rotated at the same rotational speed in the same direction.

(Pattern 2)

The drum 30 and the pulsator 40 are rotated in the same direction and the pulsator 40 is rotated at a higher rotational speed than the drum 30.

(Pattern 3)

Stops the energization of the motor 50 driving the pulsator 40 and rotates the drum 30 in a state in which the pulsator 40 does not transmit power.

(Pattern 4)

The drum 30 is rotated in a state where the rotation of the pulsator 40 is stopped by the control.

(Pattern 5)

The energization of the motor 50 for driving the drum 30 is stopped and the pulsator 40 is rotated in a state in which no power is transmitted to the drum 30. [

(Pattern 6)

The pulsator 40 is rotated in a state in which the rotation of the drum 30 is stopped by the control.

(Pattern 7)

The drum 30 and the pulsator 40 are rotated in directions opposite to each other and the pulsator 40 is rotated at a higher rotation speed than the drum 30.

(Pattern 8)

The drum 30 and the pulsator 40 are rotated at the same rotational speed in the opposite direction to each other.

In the operation of the pattern 1, the same operation as that of the conventional drum type washing machine is performed.

In the operation of the pattern 2, the operation in which the convection (flow) effect by the pulsator 40 is given to the operation of the pattern 1 is performed. That is, the pulsator 40 rotates more quickly with respect to the laundry to be rotated in the drum 30, thereby pushing or pulling the laundry. The laundry pushed by the pulsator 40 or the attracted laundry is accelerated and rides on the laundry staying in front of the laundry to enter the middle portion of the drum 30 in the vertical direction. By repeating this operation continuously, the laundry in the rear is pushed forward, and the laundry in the front moves along the rear. As a result, the laundry flows through the drum 30 in the forward and backward directions while circulating, thereby reducing washing irregularities.

In the operation of the pattern 3, since all of the mechanical force required for tapping and sucking is obtained from the drum 30, almost the same operation as that of the conventional drum type washing machine is performed. In this operation, since the power of the pulsator 40 is cut off, the power consumption can be reduced while maintaining the cleaning power.

In the operation of the pattern 4, the pulsator 40 is kept stationary (in the operation of the pattern 3, the pulsator 40 is rotatable inertially). The pulsator 40 is in a relatively inverted state with respect to the rotating drum 30 because the pulsator 40 is stopped. Therefore, the same effect as that of washing laundry or knocking laundry is obtained.

The operation of the pattern 5 causes the pulsator 40 to rotate in a state in which the drum 30 can rotate inertially in contrast to the operation of the pattern 3 so that the water tank 20 is filled with sufficient water, Quot; sucking rubbing " can be performed. For example, when the laundry is a delicate garment, the operation of the pattern 5 can reduce the damage or form of the laundry.

In the operation of the pattern 6, unlike the operation of the pattern 5 in which the drum 30 can rotate freely, the drum 30 is kept stationary.

The operation of the pattern 7 performs the most effective operation for realizing the above-described cleaning mechanism. In the operation of the pattern 8, since the action of the pulsator 40 is lower than the operation of the pattern 7, this pattern is suitable when it is desired to weaken the mechanical force acting on the laundry.

In a conventional drum type washing machine for performing " tapping and sucking ", in order to prevent laundry from adhering to the drum 30, the number of rotations of the drum 30 during washing is set to be less than 50 rpm. Therefore, there is a problem in that it is difficult for the washing water collected in the water tank 20 to stagnate easily so as to continuously circulate and supply the washing water into the drum 30.

Therefore, there is a type in which a pump or the like is installed to continuously circulate and supply the washing water collected in the water tub 20 to the inside of the drum 30, but the structure is complicated and the running cost is increased do. In addition, there is also a model in which a washing water is pumped up (i.e., pumped up) into the drum 30 by rotation of the drum 30 during washing without using a pump. However, it is necessary to set the number of revolutions of the drum 30 to be high (for example, from 60 rpm to 120 rpm) during the positive water stroke, and the laundry stuck on the drum 30 and can not suck it. For this reason, the positive water treatment is limited to a short time during washing, and sufficient effect can not be obtained.

On the other hand, since the number of rotations of the drum 30 can be set higher in the washing machine 1 than in the conventional drum type washing machine, the washing water can be continuously circulated and supplied to the inside of the drum 30 without installing a separate pump or the like. That is, at the time of washing, the drum 30 is rotated at a rotation speed of 60 rpm or more. As a result, the washing water starts to be sprayed from the gap portion between the water tub 20 and the drum 30 at the front, and the washing water flows into the drum 30. Thus, since the washing water can be continuously circulated and supplied uniformly while the washing machine is operated with sufficient mechanical force and flow, high washing power can be ensured and the running cost is not increased.

In addition, there is also a machine which improves the washing effect by continuously circulating and supplying the foamed (rinsed) wash water into the drum 30. Such a device is equipped with a special device for foaming the washing water.

On the other hand, if the drum 1 is rotated by the drum 30 at a rotation speed of 60 rpm or more, the washing water can be stirred and foamed at a narrow gap portion between the water tray 20 and the drum 30. The foamed washing water is continuously circulated and supplied to the inside of the drum 30 by pump up (i.e., pumped up) as described above. As described above, the washing machine 1 can continuously circulate and supply the foamed washing water without installing a special device.

Circulating supply of washing water or washing foam (bubbles) may be performed not by the drum 30 but by rotating the pulsator 40. A concave-convex structure, a stirring blade, or the like may be provided on the drum 30 or the pulsator 40 in order to increase the circulating supply of the washing water or the foaming efficiency.

In a conventional drum type washing machine, a structure called a " lifter " which is projected to the inner peripheral surface of the drum 30 is usually provided. The lifter has a function of efficiently lifting and dropping laundry from a high position in accordance with the rotation of the drum 30, and is important in increasing the mechanical force by tapping and sucking.

However, in this washing machine 1, a lifter is not required to allow the laundry to adhere to the inner peripheral surface of the drum 30 by centrifugal force. Even if a lifter is provided, the amount of protrusion can be reduced. Conversely, if there is a large lifter, the laundry may be damaged if the laundry is caught on both the lifter and the projecting portion 45 of the pulsator 40, so that the lifter is preferably small.

Therefore, omission of the lifter or downsizing of the lifter can reduce the cost of the member and enlarge the volume of the drum 30. [ Further, the lifter may be replaced with a simple protrusion formed on the inner circumferential surface of the drum 30.

<Operation control>

In order to obtain optimum performance in washing of the washing machine 1, it is preferable to appropriately select an operation pattern depending on the situation.

For example, when the drum 30 and the pulsator 40 rotate in opposite directions, the power consumption increases when the laundry capacity is large, such as near the rated capacity. In this case, increasing the number of revolutions of the drum 30 and pulsator 40 can suppress power consumption.

That is, when the rotational speed is low, a high torque is needed because the fluctuation of the laundry in the drum 30 becomes large. However, when the rotational speed is high, the laundry is attached to the inner circumferential surface of the drum 30, And a high torque is unnecessary. As the rotational speed of the pulsator 40 increases, the laundry is less likely to be caught by the projecting portion 45, thereby reducing power consumption.

On the other hand, if the capacity of laundry is small and there is sufficient space inside the drum 30, if the number of revolutions of the drum 30 is excessively increased, the centrifugal force is increased and the amount of laundry to be caught on the projections 45 decreases. Therefore, in this case, it is necessary to select the optimum operation pattern, such as reducing the number of revolutions of the drum 30, or tapping and sucking.

For this purpose, it is necessary to determine the weight of the laundry charged into the drum 30, the capacity of the laundry (or the residual capacity of the drum 30), the type of laundry (the type of fabric) 10, the controller 60 of the washing machine 1 includes a weight determining section 61, a fabric type determining section 62, a capacity determining section 63, an operation condition determining section 64, and the like Respectively.

The weight determining section 61 determines the weight of the laundry charged into the drum 30 so that the drum 30 and the pulsator 40 are moved in the same direction And the weight of the laundry is detected by rotating in the opposite direction. The number of revolutions may be constant or may be changed.

The capacity determining section 63 rotates the drum 30 and the pulsator 40 in the direction opposite to the direction of weight determination. Thus, the capacity determining section 63 determines the capacity ratio of the laundry to the amount of contents (capacity) of the drum 30 based on the difference (difference) with the weight detection.

The cloth type determination unit 62 introduces (introduces) a predetermined amount of water into the water tub 20 and absorbs the water into the laundry loaded into the drum 30 for a predetermined time. The cloth type determining unit 62 stores the absorbed data for each fabric type. The cloth type determining unit 62 determines the type of the laundry based on the change in the water level inside the water tank 20 at that time (the difference between the water level at the time of introduction and the water level after a predetermined period of time) Type. The detection of the water level may be performed based on the water pressure inside the water tank 20, and the water level at the time of introduction (introduction) may be calculated from the water introduced (introduced).

The operating condition determining unit 64 determines the rotational direction and the rotational speed of each of the drum 30 and the pulsator 40 based on at least one of these determination results. These determinations may be made not only at the start of the washing cycle but also during the washing cycle. Of course, this can also be done at the time of rinsing.

Normally, the washing process is divided into the respective processes of "washing", "rinsing", and "dehydration".

When there are two or more rinsing strokes between the washing and rinsing strokes, there may be a dehydration stroke called intermediate dehydration between successive rinsing strokes. Torque is required to rotate the drum 30 or pulsator 40, but the torque required in the washing, rinsing, and dewatering stages is different. In general, a large torque is required for washing or rinsing, and a large torque is not required for the dewatering stroke.

Therefore, at the time of dewatering, energization of the motor 50 driving the pulsator 40 is stopped, and the pulsator 40 may rotate only the drum 30 while rotating inertia. By doing so, power consumption for rotating the pulsator 40 is eliminated, so that power consumption can be suppressed. However, in this case, when the state of the laundry is suddenly changed when the drum 30 and the pulsator 40 rotate at different rotational speeds, the laundry may be damaged.

Therefore, as a countermeasure thereto, the magnetization rate of the motor 50 for driving the drum 30 may be changed. By doing so, power consumption can be suppressed even if the drum 30 and pulsator 40 are rotated at the same time. For example, when the laundry reaches a stable state (a state in which the drum 30 rotates at a rotational speed of about 60 rpm to about 120 rpm) at the start of the spin-drying cycle or during the spin-drying cycle, And the power consumption at the time of high rotation can be reduced by decreasing the magnetization rate.

&Lt; Effect of washing machine 1 >

The effects of the above-described washing machine 1 will be described in comparison with a conventional washing machine (a drum type washing machine of Patent Documents 1 and 2).

Since the washing machine 1 does not require a drum having a large-scale structure like that of a conventional washing machine, it is possible to increase the amount of the drum 30 and to suppress the manufacturing cost and the running cost.

The washing machine 1 is not required to dispose a sub drum in the main drum and to provide a predetermined gap between the drum and the sub drum like a conventional washing machine. In the washing machine 1, the laundry is inserted into such a gap, thereby improving the washing performance. As a result, the drum capacity can be increased, and a compact washing machine that can meet the recent demand for large capacity can be realized.

The washing machine 1 combines the two-dimensional movement of the laundry, which is obtained by switching the rotational speed or the rotational direction of the main drum and the sub-drum, and the movement of the whole drum by rotation, as in the conventional washing machine, Dimensional laundry can be obtained only by rotating the drum 30 and the pulsator 40 at different speeds. Preferably, it is possible to obtain a three-dimensional laundry flow only by rotating in the reverse direction. More preferably, by rotating the pulsator 40 faster than the drum 30, a larger three-dimensional laundry flow can be obtained.

Since the conventional drum washing machine can not impart the mechanical force to the laundry in excess of the tapping of the conventional drum washing machine, improvement of the washing effect can not be expected in each of the main drum and the sub drum of the conventional washing machine. On the other hand, in the washing machine 1, the number of revolutions of the pulsator 40 is made higher than that of the drum 30 and "washing" is performed while using the centrifugal force of the drum 30 and the mechanical force of the pulsator 40, It is possible to utilize not only the effect of washing the laundry with the protruding portion 45 of the pulsator 40 but also the effect of sucking the laundry by knocking on the laundry, the effect of washing the clothes against each other, and the washing stain reduction effect caused by mixing laundry.

Further, the projecting portion 45 of the pulsator 40 also functions as a so-called lifter. Therefore, in the washing machine 1, like the conventional washing machine, the lifter on the inner peripheral surface of the drum 30 is not essential.

This effect becomes more pronounced when a large amount of laundry is washed. That is, in the conventional washing machine, when the amount of the laundry is increased, the remaining capacity in the drum which can exert the mechanical force is insufficient. In order to solve this problem, in the conventional washing machine, the washing performance is secured by increasing the immersion time in the washing water, that is, by increasing the washing time. On the other hand, since the above-described effect is obtained in the washing machine 1, the extension of the washing time can be minimized.

In a conventional washing machine, centrifugal force can be used when rotating at a high speed, so that the same effects as those of laundry occurring at the boundary portion between the main drum and the sub drum occur. However, at a portion remote from the boundary portion, the laundry adheres to the drum and can not impart mechanical force.

Further, in order to drive both the main drum and the sub drum, a larger force than that of the washing machine 1 is required. Sub drums larger than pulsator 40 have large inertia force, which not only requires high torque but also torque to lift laundry from each drum. Further, a torque for canceling a counter force generated at a boundary portion between the main drum and the sub drum is also required, and a motor with a high output is required.

Generally, in order to increase the output of the motor, it is necessary to increase the lamination thickness of the stator core and the rotor core, and to use a high magnetic force magnet. The increase in the lamination thickness involves an increase in the thickness of the motor, thereby causing problems such as enlargement of the washing machine and reduction in the content of the drum. Either manufacturing cost or running cost can not be avoided.

On the other hand, in the washing machine 1, almost no force is required to lift the laundry into the pulsator 40, and the inertia force is small, so that the power consumption can be suppressed. The motor 50 can be downsized, and the amount of the drum 30 can be increased.

<Details of motor>

2, the motor 50 has an outer shape of a flat cylindrical shape whose diameter is smaller than that of the water tray 20. The motor 50 is attached to the bearing housing 23a of the water tray 20 Respectively. The motor 50 includes an outer rotor 53 (second rotor), an inner rotor 52 (first rotor), an inner shaft 71, an outer shaft 72, a stator 51 .

The outer rotor 53 and the inner rotor 52 are connected to the pulsator 40 and the gimbal drum 30 without interposing a clutch or an accelerating device so that the outer rotor 53 and the inner rotor 52 are configured to directly drive them have.

These two rotors 52 and 53 are driven and controlled by one inverter. Each of the outer rotor 53 and the inner rotor 52 shares the coil 163 of the stator 51 and supplies the current to the coil 163 so that the rotor can be driven independently . In the case of this motor 50, when the two rotors 52 and 53 rotate in the same direction and in the opposite direction, the ratio of the number of rotations of both rotors is, for example, 1: 1, 1: And becomes a fixed value as well. The rotation of each of the rotations in the same direction and the opposite direction is performed by magnetization, and the ratios of the ratios in the same direction and in the opposite direction are different.

The outer rotor 53 is a cylindrical member having a flat bottom and includes a bottom wall portion 121 having a center portion opened and a rotor yoke 122 installed upright around the bottom wall portion 121 And a plurality of outer magnets 124 made of an arc-shaped permanent magnet. The bottom wall portion 121 and the rotor yoke 122 are formed by pressing an iron plate so as to function as a back yoke.

In the present embodiment, the outer rotor 53 is a consequent type rotor, and the sixteen outer magnets 124 are arranged so that the S poles are arranged at intervals in the circumferential direction, and the rotor yoke 122). The number of magnetic poles of the outer rotor 53 can be switched between 16 poles and 32 poles by reversing the magnetic poles of the outer magnet 124 as will be described later in detail.

The inner rotor 52 is a flat cylindrical member having an outer diameter smaller than that of the outer rotor 53. The inner rotor 52 has an inner supporting wall portion 131 having a center portion opened and an inner supporting wall portion 131 disposed on the inner side of the inner supporting wall portion 131 A peripheral wall portion 132, and a plurality of inner magnets 134 made of a rectangular plate-like permanent magnet.

In the present embodiment, the inner rotor 52 is a spoke type rotor, and 32 inner magnets 134 are arranged radially in the circumferential direction at intervals. The inner rotor 52 is fixed to the inner peripheral wall portion 132, . A rotor core 133 is disposed in the circumferential direction between the inner magnets 134.

The inner shaft 71 is a cylindrical shaft member and is rotatably supported by the bearing housing 23a through an inner bearing 73, an outer shaft 72 and an outer bearing 74. [ The lower end of the inner shaft 71 is connected to an outer rotor 53. The upper end of the inner shaft (71) is connected to the pulsator (40).

The outer shaft 72 is a cylindrical shaft member which is shorter than the inner shaft 71 and has an inner diameter larger than the outer diameter of the inner shaft 71. The outer shaft 73 is composed of upper and lower inner bearings 73 and 73, And is rotatably supported by the bearing housing 23a through an external bearing 74. [ The lower end portion of the outer shaft 72 is supported by the shaft supporting portion 24. The upper end of the outer shaft 72 is connected to the flange shaft 34 of the drum 30.

The stator 51 is formed of an annular member having an outer diameter smaller than the inner diameter of the outer rotor 53 and an inner diameter larger than the outer diameter of the inner rotor 52. The stator 51 is provided with a plurality of teeth 161, coils 163, and the like buried in a resin as shown in Fig. The stator 51 of the present embodiment is provided with 24 I-shaped teeth 161 and coils 163.

The teeth 161 are thin plate-shaped iron members whose vertical cross-section has an I-shape, and are arranged so as to be independent from each other around the entire circumference of the stator 51 so as to be radially arranged at equal intervals. The inner circumferential side and outer circumferential side end portions of the teeth 161 protrude in a flange shape in the circumferential direction from both corners thereof.

A coil 163 is formed in each tooth 161 by inserting an insulating material in the teeth 161 and continuously winding three wires coated with an insulating material in a predetermined order and configuration. One group of teeth 161 in which the coil 163 is formed is buried in the thermosetting resin by mold forming while only the respective diametral end faces are exposed and is fixed in a fixed arrangement in an insulated state.

The end of the tooth 161 on the side of the inner rotor 52 faces the rotor core 133 with a slight gap and the end of the tooth 161 on the side of the outer rotor 53 faces the outer magnet The inner rotor 52 and the outer rotor 53 are assembled so as to oppose each other with a slight clearance.

A position sensor 164 is disposed between adjacent teeth 161. The position sensor 164 is disposed in the vicinity of the inner rotor 52 to grasp the position of the inner rotor 52. [

As shown in Fig. 12, one inverter (118) of three phases is connected to the motor (50). In this motor 50, when the coil 163 of the stator 51 is energized, different poles are simultaneously generated on the outer side and the inner side of the teeth 161, and in accordance with the rotating magnetic field, the outer rotor 53 and the inner rotor 52 rotate independently of each other.

The outer rotor 53 and the inner rotor 52 share the stator 51 and the outer rotor 53 and the inner rotor 52 are shared by the single inverter 118. [ Can be rotationally driven in a plurality of rotation modes.

(Switching operation of the number of magnetic poles)

Fig. 11 is a plan sectional view showing a main part of the motor, showing the state of a machine angle of 45 deg. The outer magnet 124 is all comprised of a switching magnet 125 (switching magnet). Each of the inner magnets 134 is composed of a fixed magnet 135.

Here, the switching magnet 125 is a magnet in which the polarity of the magnet is reversed when a magnetizing current is supplied to the coil 163 as the magnetic pole number switching portion (switching portion). The fixed magnet 135 is a magnet that does not invert the polarity of the magnet even if a magnetizing current is supplied to the coil 163. It is not necessary to depend on the magnitude of the coercive force (to be described later) and the kind of magnet. Here, " inverted " and " not inverted " indicate the polarity of the entire magnet, and even if there is a reverse pole in a part, it can be determined as a total magnetic flux.

In the present embodiment, the number of poles St of the stator 51 is 24, the number of poles of the inner rotor 52 is 32, and the number of poles of the outer rotor 53 is 32. Is represented by St: m = 3: 4. Here, the outer rotor 53 can be switched to 32 poles or 16 poles by switching the number of poles by magnetization.

In the state shown in Fig. 11, the outer magnets 124 are arranged so that the surface of the outer magnet 124 on the side of the teeth 161 is spaced apart in the circumferential direction to be the S pole. With this arrangement of the outer magnet 124, the rotor yoke 122 of the outer rotor 53 between the adjacent S-pole outer magnets 124 becomes the N pole, The number of poles of the outer rotor 53 becomes 32 poles. Here, since the N pole portion of the rotor yoke 122 does not have a pole structure, the magnetoresistance between the rotor yoke 122 and the teeth 161 becomes substantially equal. By using a constant-type rotor without such a pore structure, it is possible to suppress vibration and noise.

The magnetic flux from the N pole portion of the rotor yoke 122 passes the side of the inner rotor 52 through the teeth 161 and passes through the other teeth 161 to the outer magnet 124 , And is returned to the N pole of the rotor yoke 122 through the rotor yoke 122. [

When the number of poles of the outer rotor 53 is 32 poles, the air gap which is the gap between the rotor yoke 122 of the N pole of the outer rotor 53 and the teeth 161 is large, Lt; / RTI &gt; Therefore, it is preferable to set the pole number of the outer rotor 53 to 32 poles at the time of dewatering requiring high speed and low torque.

On the other hand, a magnetizing current is supplied to the coil 163 to invert some of the magnetic poles of the outer magnet 124, and as shown in Fig. 14, N poles and S poles are arranged alternately in the circumferential direction The number of poles of the outer rotor 53 becomes sixteen poles.

15, the magnetic flux from the N pole of the outer magnet 124 passes the side of the inner rotor 52 through the teeth 161, and passes through the other teeth 161 to the outer magnet And is returned to the N pole of the outer magnet 124 through the rotor yoke 122. [

When the number of magnetic poles of the outer rotor 53 is 16 poles, the induced voltage is smaller than that of 32 poles, which is the gap between the outer magnet 124 of the N pole and the teeth 161. Therefore, It grows. Therefore, it is preferable to set the number of poles of the outer rotor 53 to 16 poles at the time of washing requiring low speed and high torque.

Next, with reference to Fig. 11, a method of changing the magnetic pole of the outer magnet 124 from 32 poles to 16 poles will be described. 11 shows 32 poles, but it is possible to make 16 poles by switching the magnetic pole of the first magnet from the bottom to the N pole from the S pole. The magnetization current is supplied to the coil 163 so that a magnetic field flows in the first tooth 161 from the bottom and the second tooth 161 from the bottom in the direction indicated by the arrow in Fig. Accordingly, the magnetic pole of the first outer magnet 124 from the bottom can be reversed from the S pole to the N pole.

Next, a method of switching the magnetic pole of the outer magnet 124 from 16 poles to 32 poles will be described with reference to Fig. 14 shows 16 poles, but 32 poles can be obtained by switching the magnetic pole of the first magnet from the bottom to the north pole to the south pole. A magnetizing current is supplied to the coil 163 so that a magnetic field flows in the first tooth 161 from the bottom and the second tooth 161 from the bottom in the direction indicated by the arrow in Fig. Accordingly, the magnetic pole of the first outer magnet 124 from the bottom can be reversed from the N pole to the S pole.

In the case of the arrangement of the outer magnet 124 shown in Fig. 14, the pole in front of the first outer magnet 124 from the bottom may remain, but if necessary, The magnetization can be completely reversed by appropriately adjusting the angle of the rotor 53 and the magnetization current flowing into the coil 163 and performing magnetization a plurality of times.

Thus, even when the switching magnet 125 and the stationary magnet 135 are made of a ferrite magnet having the same coercive force, by appropriately setting the magnetic path of the magnetic flux for magnetization, 125) can be stably performed.

The switching magnet 125 and the fixed magnet 135 may be composed of two or more kinds of magnets having different coercive forces. For example, by making the coercive force of the stationary magnet 135 larger than the coercive force of the switching magnet 125, more stable magnetization can be obtained. It is also possible to more easily balance the torque between the inner rotor 52 and the outer rotor 53 by using a rare earth magnet for the fixed magnet 135 of the inner rotor 52.

16 is a diagram showing a B-H curve (magnetic hysteresis curve) when a magnet having a coercive force different from that of the stationary magnet 135 and the switching magnet 125 is used. Here, when a magnetic field which does not exceed the coercive current of + A or more and -A or less and the coercive force of the fixed magnet 135 is generated by flowing a magnetizing current to the coil 163, Can be inverted. The current to be magnetized is a pulse current, and magnetization is possible in a time of several tens msec (millisecond).

Incidentally, in magnetizing the switching magnet 125, it is advantageous that the voltage applied to the coil 163 is as high as possible in order to increase the magnetizing current. Further, even in the case of performing high-speed rotation as in dewatering, the higher the voltage is, the easier to perform. However, in the case of low-speed rotation such as washing such as washing or rinsing, and in the case of high torque, the efficiency of the inverter 118 is generally high.

Therefore, in this embodiment, a voltage equal to that of magnetization is supplied to the inverter 118 at the time of magnetization and dehydration, while a voltage lower than the magnetization voltage is supplied to the inverter 118 at the time of washing. As a result, power consumption can be reduced.

(For rotation mode)

Here, the switching operation of the number of magnetic poles for supplying the magnetizing current to the coil 163 to invert the magnetic pole of the switching magnet 125 is controlled by the controller 60. In other words, the outer rotor 53 and the inner rotor 52 are driven to rotate in a plurality of rotation modes based on a control command of the controller 60. [

17 shows the positions of the stator 51, the outer rotor 53 and the inner rotor 52 in six steps between 360 degrees of electrical angle during the rotation of the three-phase motor, ) Rotor 53 and the inner rotor 52 are rotated.

In Fig. 17, the outer rotor 53 and the inner rotor 52 are 32 poles having the same number of poles, and their mechanical angles are 45 degrees. When a drive current is supplied to the U phase, V phase, and W phase three phase coils 163, a magnetic pole is generated in the teeth 161. The magnetic pole is opposite to the inner rotor 52 side of the teeth 161 and the outer rotor side.

In the first step shown in Fig. 17, the N-pole side of the U-phase and V-phase teeth 161 on the inner rotor 52 side and the S-pole side of the inner rotor 52 of the W- Therefore, the U-phase and V-phase teeth 161 have S poles on the outer rotor 53 side and the N pole on the outer rotor 53 side of the teeth 161 on the W phase. In the following description, only the pole of the tooth 161 on the side of the inner rotor 52 will be described.

In the first step, the outer rotor 53 and the inner rotor 52 receive a torque that rotates in the rightward direction in Fig. 17 in a state where the electric angle is 180 degrees out of phase.

In the second step, the magnetic pole of the V phase tooth 161 is inverted. As a result, the V-phase tooth 161 becomes the S-pole while the U-phase tooth 161 on the inner rotor 52 side becomes the N-pole and the W-phase tooth 161 becomes the S- The inner rotor 53 and the inner rotor 52 move to the right.

In the third step, the magnetic pole of the W phase tooth 161 is reversed. As a result, the U-phase teeth 161 on the inner rotor 52 side are N poles, the V-phase teeth 161 are S poles, the W phase teeth 161 are N poles, and the outer rotor 53 and the inner rotor 52 move to the right.

In the fourth step, the magnetic pole of the U-phase tooth 161 is reversed. As a result, the U-phase tooth 161 on the inner rotor 52 side becomes the S pole and the V-phase tooth 161 becomes the S-pole and the W-phase tooth 161 becomes the N-pole in the outer rotor 53 and the inner rotor 52 move to the right.

In the fifth step, the magnetic pole of the V phase tooth 161 is inverted. As a result, the U-phase tooth 161 on the inner rotor 52 side becomes the N pole in the state of the S pole and the V phase phase tooth 161 becomes the N pole, and the W phase tooth 161 becomes the N pole, The rotor 53 and the inner rotor 52 move in the right direction.

In the sixth step, the magnetic pole of the W phase tooth 161 is reversed. As a result, the U-phase tooth 161 on the inner rotor 52 side becomes the S-pole, the V-phase tooth 161 becomes the N-pole and the W-phase tooth 161 becomes the S-pole and the outer rotor 53 and the inner rotor 52 move to the right.

Thus, the outer rotor 53 and the inner rotor 52 rotate at the same speed in the same direction. In the present embodiment, this rotation mode is referred to as a synchronous rotation mode. In addition, there is a case where the phases of the outer rotor 53 and the inner rotor 52 are slightly shifted due to load or load fluctuation. However, in the example shown in Fig. 17, there is no phase shift.

Next, the rotation mode when the number of magnetic poles of the outer rotor 53 is changed will be described with reference to Fig. As shown in Fig. 18, the outer rotor 53 has 16 poles and the inner rotor 52 has 32 poles.

In the first step shown in Fig. 18, the N-pole side of the U-phase and V-phase teeth 161 on the inner rotor 52 side and the S-pole side of the inner rotor 52 side of the W- Therefore, the U-phase and V-phase teeth 161 have an S-pole on the outer rotor 53 side and an N-pole on the outer rotor 53 side of the W-phase tooth 161.

In the first step, the inner rotor 52 receives, as torque, a force rotating in the right direction in Fig. On the other hand, the outer rotor 53 receives a torque that rotates in the left direction in Fig. 18 as torque.

In the second step, the magnetic pole of the V phase tooth 161 is inverted. As a result, when the U-phase tooth 161 on the inner rotor 52 side is in the N-pole state and the V-phase tooth 161 is in the S-pole and the W-phase tooth 161 is in the S- And the outer rotor 53 moves in the leftward direction.

In the third step, the magnetic pole of the W phase tooth 161 is reversed. As a result, the U-phase tooth 161 on the side of the inner rotor 52 has the N-pole, the V-phase tooth 161 becomes S-pole and the W-phase tooth 161 becomes N- And the outer rotor 53 moves in the left direction.

In the fourth step, the magnetic pole of the U-phase tooth 161 is reversed. As a result, the U-phase tooth 161 on the inner rotor 52 side becomes the S pole, the V-phase tooth 161 becomes the S pole and the W phase upper tooth 161 becomes the N pole, And the outer rotor 53 moves in the left direction.

In the fifth step, the magnetic pole of the V phase tooth 161 is inverted. As a result, the U-phase tooth 161 on the inner rotor 52 side becomes the N pole in the state of the S pole and the V phase phase becomes the N pole and the W phase tooth 161 becomes the N rotor in the state of the N pole And the outer rotor 53 moves in the leftward direction.

In the sixth step, the magnetic pole of the W phase tooth 161 is reversed. As a result, the U-phase tooth 161 on the inner rotor 52 side becomes the S-pole, the V-phase tooth 161 becomes the N-pole and the W-phase tooth 161 becomes the S-pole and the inner rotor 52 And the outer rotor 53 moves in the left direction. At this time, the amount of movement of the outer rotor 53 is twice that of the inner rotor 52.

Thus, the outer rotor 53 and the inner rotor 52 rotate at different speeds in different directions. In the present embodiment, this rotation mode is referred to as a reciprocal rotation mode.

Further, as the rotation mode, other rotation ratios or the same rotation ratios of the synchronous rotation mode and the semi-rotational mode can be constituted by the combination of the number of magnetic poles in addition to the present embodiment. As described above, the synchronous rotation mode and the upper half rotation mode also include a rotation mode in which rotation is performed at an arbitrary rotation ratio by rotating at the same speed in the same direction or in different directions, or at another torque.

As described above, according to the motor 50, the inverter can rotate the outer rotor 53 and the inner rotor 52 in a plurality of rotation modes in a simple structure. In other words, a plurality of inverters 118 required for independently rotating the two rotors are not needed, and the size of the inverter 118 can be reduced, thereby making the product compact and reducing the cost.

(Modified Example 1 of Motor)

19 is a plan sectional view showing the motor configuration of the first modified example. Hereinafter, the same reference numerals are given to the same parts as those of the above-described embodiment, and only differences will be described.

19, the inner rotor 52 is a spoke type rotor, and 32 inner magnets 134 are arranged so as to be radially arranged with an interval in the circumferential direction, and the inner peripheral wall portion 132, As shown in Fig. Each of the inner magnets 134 is composed of a fixed magnet 135. A rotor core 133 is disposed in the circumferential direction between the inner magnets 134.

The outer rotor 53 is an SPM type rotor, and 32 outer magnets 124 are arranged so that S poles and N poles are alternately arranged in the circumferential direction, and fixed to the inner surface of the rotor yoke 122 .

Here, the outer magnet 124 is composed of the switching magnet 125 and the fixed magnet 135. Specifically, among the five outer magnets 124 shown in FIG. 19, the first, second, and fifth magnets from the bottom are composed of the switching magnets 125. The third and fourth magnets from the bottom are composed of fixed magnets 135. That is, two adjoining magnets are composed of magnets having the same function.

When the magnetization current is supplied to the coil 163 to invert the magnetic poles of all the switching magnets 125, as shown in FIG. 20, the first and fifth switching magnets 125 from the bottom to the N And the second switching magnet 125 from the bottom is reversed from the N pole to the S pole. In this manner, by switching the pair of adjacent two S poles and adjacent two N poles alternately in the circumferential direction, the number of poles of the outer rotor 53 is set to 16 poles .

When the driving current is supplied to the coil 163 when the number of magnetic poles of the outer rotor 53 is 32 poles, the outer rotor 53 and the inner rotor 52, as indicated by arrows in FIG. 19, Both rotate clockwise. That is, it can be rotated and driven in the synchronous rotation mode.

On the other hand, when the driving current is supplied to the coil 163 when the outer rotor 53 has sixteen poles, the outer rotor 53 rotates counterclockwise as indicated by the arrow in FIG. 20, The inner rotor 52 rotates clockwise. That is, it can be rotated and driven in the half-rotation mode.

The numbers of the inner magnet 134 and the outer magnet 124 are merely examples and the present invention is not limited to this embodiment. Although the outer magnet 124 is composed of the switching magnet 125 and the fixed magnet 135, all of the switching magnets 124 may be replaced by the switching magnet 125. In this case, the number of magnetic poles can be switched by inverting only the magnetic poles of the half of the switching magnets 125. In this manner, magnetization switching can be performed without distinguishing between the switching magnet 125 and the stationary magnet 135. [

(Modification example 2 of the motor)

21 is a plan sectional view showing a motor configuration of the second modification. 21, the inner rotor 52 is an embedded SPM type rotor, and 32 inner magnets 134 are arranged so that S poles and N poles are alternately arranged in the circumferential direction, and the inner peripheral wall portions 132 ). Each of the inner magnets 134 is composed of a fixed magnet 135.

The outer rotor 53 is an SPM type rotor, and 32 outer magnets 124 are arranged so that S poles and N poles are alternately arranged in the circumferential direction, and fixed to the inner surface of the rotor yoke 122 . Although the outer magnet 124 is composed of the switching magnet 125 and the fixed magnet 135, the arrangement thereof is the same as that of the first modification, and the explanation is omitted.

(Variation 3 of the motor)

22 is a plan sectional view showing the motor configuration of the third modification. 22, the inner rotor 52 is an embedded SPM type rotor, and 32 inner magnets 134 are arranged so that S poles and N poles are alternately arranged in the circumferential direction, and the inner peripheral wall portions 132 ). Each of the inner magnets 134 is composed of a fixed magnet 135.

The outer rotor 53 is a continuous type rotor and is arranged so that sixteen outer magnets 124 are spaced apart in the circumferential direction and S poles are arranged and fixed to the inner surface of the rotor yoke 122 have. The outer magnet 124 is constituted entirely by the switching magnet 125 and the number of poles of the outer rotor 53 is switched between the 16 poles and the 32 poles by reversing the poles of the switching magnet 125 It is possible. In addition, since the operation of reversing the magnetic pole of the switching magnet 125 is the same as that of the embodiment, its explanation will be omitted.

<Details of installation structure>

The inner rotor 52 is provided on the outer shaft 72 so as not to be in contact with the outer bearing 74 and not to be displaced with respect to the outer shaft 72. [

23, the outer shaft 72 has an outer diameter R1 of the portion 72c supported by the outer bearing 74 located on the drum 30 side, The outer diameter R2 of the portion 72d supported by the outer bearing 74 (ball bearing 74) located on the opposite side of the drum 30 is formed to have the same diameter.

The outer shaft 72 is not constituted by combining a plurality of members, but is constituted by one member (one component).

Side end portion 72a located on the drum 30 side (tip side) of the outer shaft 72 and on the opposite side (base end side) from the drum 30 as shown in Fig. 25 In the vicinity of the proximal end 72b, a fitting portion 72e having an engaging portion formed by serration is formed on the outer circumferential surface. The inner rotor 52 is attached to the outer shaft 72 by inserting the shaft hole of the inner rotor 52 into the mounting portion 72e of the base end side end portion 72b.

The inner rotor 52 is fixed to the outer shaft 72 by fastening the nut N to the proximal end 72b of the outer shaft 72, . A washer W functioning to prevent loosening of the nut N is inserted between the lower surface of the outer shaft 72 and the upper surface of the nut N. [

On the outer circumferential surface of the proximal end side portion of the outer shaft 72, two groove portions 152 and 153, which are concaved along the circumferential direction, are provided at intervals.

As shown in Fig. 24, a rubber ring 175 is fitted in the groove portion 153 located at the tip end side. The rubber ring 175 is in contact with the upper end of the ball bearing 74.

A snap ring 181 is fitted in the groove portion 152 located on the proximal end side. The snap ring 181 is a so-called C-shaped snap ring and has a substantially C-shaped shape in plan view. The snap ring 181 protrudes outward from the outer circumferential surface of the outer shaft 72 when the snap ring 18 is fitted and fixed in the groove portion 152 to constitute the contact portion 80. That is, the snap ring 181 has a width larger than the depth of the groove portion 152.

A predetermined gap is provided between the contact portion 80 constituted by the snap ring 181 and the ball bearing 74 in the axial direction.

The inner rotor 52 contacts the contact portion 80 when the outer shaft 52 is inserted into the inner rotor 52. The inner rotor 52 is configured such that when the nut N is fastened And is sandwiched between the contact portion 80 and the nut (N).

(Modified example)

Figs. 26 and 27 show modifications of the installation structure of the inner rotor in the outer shaft. Fig.

As described above, the outer shaft 72 is rotatably supported on the bearing housing 23a through two outer bearings 74, which are vertically spaced apart from the shaft support 24. As shown in Fig.

In this modification, these outer bearings 74 (outer race 174a, outer race) are press-fitted into the bearing housing 23a, and the outer shaft 72 is fixed to these outer bearings 74 Lace 174b (inner lace)).

The outer bearings 74 (front bearings 74F) on the front side of these outer bearings 74 have bearings superior in stability to support and larger in size than the outer bearings 74 (rear bearings 74R) on the rear side . A load greater than that of the rear bearing 74R is applied to the front bearing 74F, so that the front bearing 74F can be relatively increased to stably support the vehicle, and vibration and noise can be suppressed.

The front end portion of the outer shaft 72 protrudes forward from the shaft support portion 24 and is located inside the water tray 20. [ A drum 30 is provided at a front end portion of the outer shaft 72 through a flange shaft 34. An outer shaft 72 and a flange shaft 34 are provided between the front end portion of the outer shaft 72 and the flange shaft 34. The outer shaft 72 and the flange shaft 34 are fixed to each other by serration, Is fixed so as not to be rotatable.

The pulsator 40 is non-rotatably fixed to the front end portion of the inner shaft 71 protruding into the drum 30 through the anti-rotation structure, like the outer shaft 72.

On the other hand, the rear end portion of the outer shaft 72 protrudes rearward from the shaft support portion 24, and the rear end portion of the outer shaft 72 is inserted into the shaft hole of the inner rotor 52 The inner rotor 52 is connected to the outer shaft 72 by insertion. The rear end portion of the inner shaft 71 protruded from the rear end of the outer shaft 72 is inserted into the shaft hole of the outer rotor 53 so that the outer rotor 53 is inserted into the inner shaft 71).

When the double shaft 70 is mounted on the shaft support portion 24, the outer shaft 74 is fixed to the shaft support portion 24 by inserting the outer shaft 72 from the front. Therefore, as shown in Fig. 26, the inner diameter of the front bearing 74F is larger than the inner diameter of the rear bearing 74R. Accordingly, the outer shaft 72 has a large-diameter portion 172a having an outer diameter that fits (loosely fits) the front bearing 74F to the body portion between the front end portion and the rear end portion, Diameter portion 172b having an outer diameter smaller than that of the large-diameter portion 172a which is fit (loosely fitted) to the outer diameter portion 74R. The large-diameter portion 172a is located on the front side of the small-diameter portion 172b.

The front end portion of the outer shaft 72 on the end side after insertion has an outer diameter larger than that of the large diameter portion 172a and an outer shaft 72 is provided at a boundary between the front end portion and the large diameter portion 172a. Shaped front side step 172c for restricting the rearward movement of the front side step 172c. A ring-shaped rear side step 172d for restricting the rearward movement of the outer shaft 72 is also provided at a boundary between the large-diameter portion 172a and the small-diameter portion 172b.

The outer shaft 72 is positioned on the shaft support portion 24 so that the front bearing 74F contacts the front side step 172c and the rear bearing 74R contacts the rear side step 172d .

Since the rear end portion of the outer shaft 72 on the insertion distal end side needs the outer diameter smaller than the outer diameter of the small diameter portion 172b, the rear end portion of the outer shaft 72 has the small diameter portion 172b (also referred to as a rotor connecting end 172e). The outer diameter of the rotor connecting end portion 172e is smaller than that of the small diameter portion 172b so that the insertion of the outer shaft 72 into the rear bearing 74R and the front bearing 74F is facilitated.

The outer shaft 72 is supported by the shaft support portion 24 so that the gap retaining ring 80a, the inner rotor 52 and the fixture (not shown) are attached to the rotor connecting end portion 172e protruding rearward from the shaft support portion 24 90, and a fixing device).

Specifically, the rotor connecting end portion 172e is provided with a mounting portion 172f following the small-diameter portion 172b and having a rotation preventing structure. The inner rotor 52 is mounted through the gap holding ring 80a by inserting the shaft hole of the inner rotor 52 into the mounting portion 172f so as to be removable.

The gap holding ring 80a is a thick metal ring having an outer diameter that contacts the inner race of the rear bearing 74R and does not contact the outer race of the rear bearing 74R And is mounted on the mounting portion 172f before the inner rotor 52. [ And the inner rotor 52 is attached to the mounting portion 172f through the gap holding ring 80a. Accordingly, the inner rotor 52 is rotatably supported by the bearing housing 23a together with the outer shaft 72. [

A male screw portion 172g having a male screw on its outer periphery is provided on the projecting end side of the mounting portion 172f of the rotor connecting end 172e. And a fastener 90 is fastened and fixed to the male screw portion 172g.

27, the fixture 90 includes a fixed base portion 91 having a female screw portion 91a formed with a female screw to be fitted into the male screw portion 172g and a fixed base portion 91 disposed around the female screw portion 91a And has a plurality of fixed rods 92 (six in this embodiment). A plurality of rod holes 9lb extending in parallel to the female threaded portion 91a are formed around the female threaded portion 91a at regular intervals on the fixed base portion 91. The rod holes 9lb, A fixed rod 92 is provided.

A male screw is formed on the outer periphery of each fixing rod 92, and a female screw thread is formed in each of the rod holes 9lb to be fitted to the male screw. Accordingly, the fixed rod 92 is slidable along the rotation axis J.

Therefore, by squeezing these fixed rods 92 into the rod holes 9lb, a pressing force can be applied to the inner rotor 52 from the outer side in the axial direction (the side of the protruding end portion of the rotor connecting end 172e) 52 are fixed to the outer shaft 72 by being pressed against the gap holding ring 80a.

Since the inner rotor 52 is firmly pressed and fixed at a plurality of positions, it is possible to improve the support strength, prevent positional deviation and loosening in the axial direction, and suppress vibration and noise. Since the spaced apart portions around the shaft are pressed firmly, the support stability is also excellent. Further, since the support portions are equally arranged, the support stability is further improved.

It is possible to change the press-in amount of each of the fixing rods 92, thereby ensuring a high-precision support balance, and it is possible to easily adjust even if loosening occurs.

<Application example of washing machine>

In the electromagnetic type washing machine, the processes such as washing, rinsing, and dewatering are successively performed. In the case of the washing machine as in the above-described Patent Document 3, since the rotating drum and the stirring body are rotated in different rotations or rotation directions in each stroke, the motor for rotating them requires a motor output in accordance with the state.

For example, in a washing or rinsing cycle, a high torque is required for the motor for driving the rotating tub and the stirring body because the washing tub is housed in the washing tub as well as laundry. On the other hand, in the spin-drying cycle in which washing water is removed, high torque is not required for the motor, but high-speed rotation is required. Further, in the washing or rinsing step, the rotating direction and the rotating speed of the rotating drum and the stirring body may be changed in order to increase the fluidity, whereas in the spinning cycle, the rotating drum and the stirring body are integrally rotated and driven in the same direction, Usually.

In addition, when processing for changing the magnetization amount of the magnet provided on the rotor and varying the output performance of the motor in accordance with each stroke is performed, it is necessary to supply a large magnetizing current to the motor at the time of magnetization.

Therefore, it is desirable to supply a large power supply voltage in order to stably operate the washing machine that rotatably controls the rotary drum and the stirring body through the shaft having the double shaft structure, but in a typical household washing machine, the commercial power supply voltage of rated output is used There is an upper limit. In addition, there are areas where the commercial power supply voltage itself is unstable overseas, so in order to provide a wide range of washing machines around the world, it is necessary to ensure that the washing machine operates stably in such areas.

Therefore, in the washing machine of this application example, even if the power supply voltages are different, the motor that rotates the rotating drum and the stirring body through the shaft of the double shaft structure can be stably driven and controlled, and is configured to be used in a wide area around the world.

(Basic configuration of the washing machine)

And is configured in the same manner as the washing machine 1 shown in Fig. 1 and the like. As shown in FIG. 7 and FIG. 8, the washing method also allows the drum 30 and the pulsator 40 to rotate in a direction opposite to each other, so that the respective mechanical forces can be synthesized and effectively applied to the laundry. Therefore, the same reference numerals are used for the same components, and a description thereof will be omitted.

However, this washing machine (1) is designed mainly for general household use and is connected to a rated commercial AC power source such as 100V or 200V. Further, the washing machine 1 is assumed to be used worldwide, and the commercial power supply voltage itself may be unstable depending on the country or region where it is used. Therefore, the washing machine 1 is designed to be stably usable even when such different rated commercial AC power sources or commercial AC power sources are unstable.

The controller 60 controls the magnetization of the motor 50, which is performed in accordance with the driving state of the drum 30 and pulsator 40 in each stroke.

28, the stator 51 includes a stator core 51a formed by laminating metal plates, a stator core 51a formed by winding conductors on the stator core 51a, and arranged at regular intervals (equidistant intervals) in the circumferential direction A plurality of coils 51b and the like. The stator 51 is provided on the rear surface of the bearing housing 23a of the water tray 20. [

The outer rotor 53 is a cylindrical member having a flat bottom and is provided with a plurality of (for example, two or more) magnetic poles (N poles and S poles) alternately arranged on the inner surface of the peripheral wall facing the stator 51 Shaped magnets 54 are arranged at equal intervals (equally spaced). These magnets 54 are composed of an alnico magnet (magnetization corresponding magnet 54) capable of changing the magnetization state, that is, magnetically reversible in terms of magnetization direction and magnetization amount reversibly.

The inner rotor 52 is a flat member having an outer diameter smaller than that of the outer rotor 53 and has magnetic poles (N poles and S poles) alternately arranged in the circumferential direction on the outer surface of the peripheral wall facing the stator 51 A plurality of rectangular plate-shaped magnets 55 are arranged at equal intervals (equidistant intervals) so as to be arranged. Unlike the outer rotor 53, these magnets 55 are made of a neodym magnet or the like having a high coercive force which can not change the magnetized state (magnetism non-compliant magnet 55).

(Power supply circuit 80 ')

The motor 50 is provided with a power supply circuit 80 'so as to be driven by electric power supplied from an external commercial AC power source. 29, a pair of electric cables 82, 82 having an outlet 81 is connected to one end of the power supply circuit 80 ', and is electrically connected to an external commercial AC power source through a plug Respectively. The motor 50 is supplied with electric power through the power supply circuit 80 '.

The power supply circuit 80 'includes a rectifying circuit 83, a boosting circuit 84, a capacitor 85, an inverter circuit 86, and the like, which are arranged in series in a pair of electric cables 82, , And supplies a predetermined complex current (mixture of three-phase and six-phase currents) controlled by the motor 50 under the control of the controller 60. [

The rectifying circuit 83 is a general circuit composed of a bridge rectifying circuit and the like, and is disposed on the power supply side of the power supply circuit 80 '. The commercial (alternating current) AC power is rectified by the rectifying circuit 83 to generate a DC voltage. The AC phase detection means 87 is provided on the power supply side of the rectification circuit 83 in the power supply circuit 80 '. The AC phase detection means 87 detects the phase of the commercial AC power source.

The step-up circuit 84 is a general circuit capable of stepping up the DC voltage rectified by the rectifying circuit 83 and comprises a reactor and a short-circuit circuit. The step-up circuit 84 is provided adjacent to the motor side of the rectifier circuit 83. A first current detecting resistor 88 and a first current detecting means 89 are provided between the booster circuit 84 and the one electric cable 82. [ The first current detecting means 89 detects the amount of current flowing from the voltage across the first current detecting resistor 88 to the step-up circuit 84.

It is possible to raise the voltage supplied from the step-up circuit 84 so that the rated output of the commercial power supply voltage is lower (lower) than the voltage required for driving the motor 50, or when the commercial AC power supply is unstable, And the voltage required for driving the motor 50 is lower than the voltage required for driving the motor 50, the constant voltage can be stably supplied to the inverter circuit 86.

In addition, since the output voltage to the motor can be adjusted to a constant level with respect to other power supply voltages by providing the step-up circuit 84, it is possible to adjust the output voltage of the motor 100 So that the convenience of the washing machine 1 is improved.

Further, the boosting circuit 84 can also be used as a power factor improving circuit, so that the power factor can be improved.

Further, since the upper limit of the maximum rotation number of the motor is limited by the supply voltage, the maximum rotation number of the motor can be increased by the step-up.

The capacitor 85 is a general member having a charging function and is provided between the boosting circuit 84 and the inverter circuit 86. The voltage supplied to the inverter circuit 86 by the capacitor 85 can be stabilized. On the motor side of the capacitor 85, a voltage detecting resistor 90 'and a voltage detecting means 91' are provided adjacent to each other. The voltage detecting means 91 'detects the voltage boosted by the boosting circuit 84.

The inverter circuit 86 is disposed on the motor side of the power supply circuit 80 'and is connected to the stator 51 of the motor 50 via three output cables 92'. The inverter circuit 86 is provided with a second current detecting resistor 93 and a second current detecting means 94. Specifically, as shown in FIG. 7, a second current detecting resistor 93 is provided in the output path of any one of the output cables 92 ' 2 current detection resistor 93 from the voltage at both ends of the current detection resistor 93 to the inverter circuit 86. [

The inverter circuit 86 adjusts the waveform of the electric power (current) based on the control of the controller 60 and outputs the composite current to the motor 50. [ By this composite current, each of the outer rotor 53 and the inner rotor 52 can be independently driven.

The power supply circuit 80 'is controlled by the controller 60. The controller 60 is provided with a timer 61 'for controlling the output frequency of the boosting circuit 84, a boosting amount determining unit 62' for calculating and determining the output amount of the boosting circuit 84, And an inverter output determination unit 63 'and a magnetizing control unit 64', which determine and determine an inverter output voltage.

For example, the voltage output to the motor 50 according to the driving state of the motor 50 in each stroke such as washing, rinsing, dehydration, etc. is controlled by the control of the power supply circuit 80 ' Respectively. That is, the voltage optimum for the operation pattern in each stroke is set in advance, and each time the operation pattern is changed in each stroke, the step-up amount determining unit 62 ' Is determined based on the voltage value detected by the voltage detecting means 91 '.

The boosting circuit 84 is also used as a power factor improving circuit. That is, based on the phase of the electric power detected by the AC phase detecting means 87, the voltage value detected by the voltage detecting means 91 ', and the current value detected by the second current detecting means 94, The amount of output of the step-up circuit 84 is determined by the step-up amount determining unit 62 'so as to improve the distortion and improve the power factor.

In order to improve the output efficiency, the switching frequency of the step-up circuit 84 is changed by the timer 61 'in accordance with the amount of output of the step-up circuit 84 determined by the step-up amount determining unit 62'. That is, the switching frequency is changed to high and low according to the change of the magnitude of the output of the step-up circuit 84 so that the output efficiency is improved.

(Sputtering)

In this washing machine 1, the motor 50 is driven in accordance with the driving state of the drum 30 and pulsator 40 in each stroke under the control of the magnetizing control unit 64 '.

That is, in this washing machine 1, since the composite current is generated by one inverter circuit 86 to control the rotation of the inner rotor 52 and the outer rotor 53 of the motor 50, In order to independently control the rotation direction, at least one of the magnets 54 and 55 of the inner rotor 52 and the outer rotor 53 (in this washing machine 1, the magnetization corresponding magnet 54) It is necessary to change the magnetization state.

For example, when the rotational direction of the drum 30 and pulsator 40 is changed from the same direction to the opposite direction and from the opposite direction to the same direction, the magnetic poles (N pole and S pole) of the magnetization corresponding magnet 54, .

In addition, in the washing or rinsing step, high-torque is required for rotation of the drum 30 and pulsator 40 because the drum 30 and the pulsator 40 are housed in the laundry water drum 30 as well as the laundry. Therefore, a high magnetic force is required for the magnet 44 for magnetization. On the other hand, in the spin-drying cycle, high rotation is not required for these rotations, but high-speed rotation is required. If the magnetic force of the magnet 54 corresponding to the magnet 54 is high, a large rotational resistance is generated at high speed rotation, resulting in energy loss, noise, and vibration, so that the magnetic force of the magnet 54 is preferably low.

Therefore, in this washing machine 1, the controller 60 switches the magnetic pole of the magnetization corresponding magnet 54 so that the drum 30 and the pulsator 40 rotate in the opposite direction by magnetizing the motor 50 before the washing cycle And the process of increasing the magnetization amount of the magnetism-responsive magnet 54 so as to obtain a high torque in the outer rotor 53 is performed. When the direction of rotation is changed during the washing cycle, the process of switching the magnetic pole is executed also at that time.

The controller 60 also performs a process of switching the magnetic pole of the magnetization corresponding magnet 54 so that the drum 30 and the pulsator 40 rotate in the same direction by magnetizing the motor 50 before the dewatering stroke, The processing for decreasing the magnetizing amount of the magnet 54 is executed. When the rotation direction is changed in the rinsing cycle before the dewatering stroke, the process of switching the magnetic pole is executed, and the potato process is performed before the dewatering stroke.

It is necessary to supply a large magnetizing current of a pulse shape to the motor 50 at the time of magnetization. On the other hand, in many cases, the voltage (magnetizing voltage) necessary for supplying the magnetizing current can not be secured by the commercial power supply voltage alone. Therefore, in this washing machine 1, the magnetizing control unit 64 'is configured to raise the voltage at the step-up circuit 84 to secure the magnetizing voltage.

Specifically, it is preferable that a predetermined magnetizing current flows based on the current value detected by the second current detecting means 94 at the time of magnetization, and the magnetizing voltage The output amount of the step-up circuit 84 is determined by the step-up amount determining unit 62 '.

Then, the timing of magnetization is controlled so as to efficiently supply the power required for magnetization.

That is, after being rectified by the rectifying circuit 83, the voltage of the continuous waveform (full-wave rectified waveform) is output at regular intervals as indicated by a thin solid line in Fig. On the other hand, since a large magnetizing current is output in the form of a pulse in magnetization, a difference occurs in the efficiency due to the timing of flowing the magnetizing current in relation to the voltage waveform.

Therefore, in this washing machine 1, the magnetizing control section 64 'generates the magnetizing current in accordance with the phase of the voltage as shown by the bold solid line in Fig. 30 so that the magnetizing operation is performed at the optimum timing. 30, the supply of the magnetizing current is started at the timing at which the phase detected by the AC phase detecting means 87 coincides with the reference phase? S and the second current detecting means 94 is started, The output amount of the inverter circuit 86 is determined in the inverter output determination section 63 'so that the current detected by the inverter circuit 86' reaches the reference current value Is at the reference time ts. In addition, the reference phase? S, the reference time ts and the reference current value Is are set in advance in the magnetizing controller 64 '.

The washing machine 1 can reliably drive and control the motor 50 that rotates the drum 30 and the pulsator 40 through the double shaft 70 even if the power supply voltages are different from each other, It can be widely used.

In the washing machine of this application example, a washing machine using one dual motor 50 is exemplified. However, instead of the dual motor 50, two normal motors may be used.

Specifically, two motors having one rotor on the inside or outside of one stator, that is, an inner rotor type or an outer rotor type motor are provided instead of the dual motor 50.

For example, if the motor has two inner stator and two outer stator structures arranged in a front-to-back relationship and an inner rotor and an outer rotor disposed on the inner side and the outer side of the double stator structure, (50). This motor is functionally equivalent to two independent motors arranged side by side around the rotation axis J. Of course, two ordinary motors may be provided separately.

Two inverter circuits are provided in parallel in the power supply circuit 80 'instead of the inverter circuit 86, and the motors are individually driven and controlled by these inverter circuits. In this case, since the drum 30 and pulsator 40 can be individually rotated and controlled, the magnetization control becomes unnecessary. In addition, since the number of inverter circuits is two, the power supply circuit 80 'becomes complicated. However, since an ordinary motor is used, there is an advantage that it is easy to procure.

<Another Embodiment>

This embodiment shows an example of application to a washing machine of a top loading type.

Fig. 31 shows a washing machine 1 'of the present embodiment. This washing machine 1 'is also an electronic washing machine. The washing machine 1 'has a vertically elongated rectangular box-shaped housing 102, and an inlet 104 for opening and closing the door 103 with a lid 103 is formed on the top. The loading and unloading of the laundry is performed through the input port 104. At the rear of the input port 104, various switches or display portions operated by the user are provided.

A drum 110, a drum 111, a motor 50, a pulsator 40, a balancer 114, a controller 115, and the like are provided in the housing 102. The water tank 110 is a cylindrical container having a bottom capable of storing water and is suspended inside the housing 102 by a plurality of suspensions 116 with the opening directed toward the upper inlet 104. Water can be injected into the water tub 110 through an unillustrated water injection mechanism. A drain pipe 117 controlled by a valve 117a is connected to a lower portion of the water tub 110 and unnecessary water is drained to the outside of the washing machine 1 'through the drain pipe 117.

The drum 111 is a cylindrical container having a bottom which is smaller than the water tub 110 and accommodates laundry. The drum 111 is accommodated in the water tub 110 in such a state that the drum 111 is rotatable about the vertical axis J extending in the vertical direction toward the inlet 104. The processing of the laundry is all performed inside the drum 111. In the cylindrical wall of the drum 111, a plurality of drainage holes 111a are formed on the entire surface (only a part thereof is shown in the drawing).

A balancer 114 is provided in the opening of the drum 111. The balancer 114 is an annular member containing a plurality of balls or viscous fluid therein, and adjusts the imbalance in weight balance caused by the bias of the laundry when the drum 111 rotates.

The pulsator 40 described above is provided at the bottom of the drum 111 and the motor 50 is provided at the bottom of the water tub 110.

In this washing machine 1 'as well, since a small amount of washing water is used for washing, the mechanical force of the drum 111 and the protruding portion of the pulsator 40 can be combined with each other to act on the laundry, Even if it is not obtained, the action of tapping and sucking in the drum type washing machine and the friction action by the movement of laundry can be obtained. By mixing laundry, washing irregularities can be reduced. Therefore, it is possible to improve the washing power and shorten the washing time.

Claims (15)

A housing having a charging port for receiving and receiving laundry;
A water tank provided inside the housing for storing wash water;
A drum rotatably installed in the water tub;
A pulsator provided inside the drum and configured to be rotatable with respect to the drum;
A driving device for rotating the drum and pulsator; And
And a control device for controlling the driving device such that the drum and the pulsator are rotatable in the same direction or in different directions. The method according to claim 1,
Wherein the control device controls the driving device such that the pulsator rotates in a direction different from the rotating direction of the drum during a washing cycle. 3. The method of claim 2,
Wherein the control device controls the drive device such that the rotational speed of the pulsator is higher than the rotational speed of the drum during a washing stroke. 3. The method of claim 2,
Wherein the control device controls the driving device such that the drum rotates at a speed at which the laundry can be attached to the inner circumferential surface of the drum by centrifugal force during a washing cycle. The method according to claim 1,
The driving device includes:
Stator;
An inner rotor disposed inside the stator;
An outer rotor disposed outside the stator; And
And an inverter for controlling the inner rotor and the outer rotor. 6. The method of claim 5,
The stator includes a plurality of I-shaped teeth arranged in a radial pattern, and a plurality of coils wound on each of the plurality of teeth,
Wherein a magnetic pole of a portion adjacent to the inner rotor and a magnetic pole of a portion adjacent to the outer rotor are formed opposite to each other when a current flows through the coil. 6. The method of claim 5,
Wherein at least one of the inner rotor and the outer rotor is configured to be capable of switching the number of magnetic poles according to the change of the magnetic pole by magnetization. 6. The method of claim 5,
Wherein one of the drum and the pulsator is connected to the inner rotor,
And the other of the drum and the pulsator is connected to the outer rotor. 9. The method of claim 8,
Further comprising a dual shaft connecting said drive, said drum and said pulsator,
The dual shaft
An outer shaft connecting the drum and the inner rotor and having a hollow therein; And
And an inner shaft connected to the pulsator and the outer rotor and rotatably inserted into the hollow. The method according to claim 1,
Wherein the pulsator comprises a disc portion and a radially extending protrusion of the disc portion,
Wherein the protruding portion is formed such that a protruding amount protruding from the disc portion increases from the central portion to the outer circumferential side of the disc portion. 11. The method of claim 10,
The pulsator is disposed such that an outer circumferential surface of the protrusion is spaced from an inner circumferential surface of the drum so as to form a gap between the outer circumferential surface of the protrusion and the inner circumferential surface of the drum,
Wherein the gap includes an action surface contacting the laundry and applying a force to the laundry. 12. The method of claim 11,
Wherein a maximum protruding amount of the protrusion is H and a distance between an outer circumferential surface of the protrusion and an inner circumferential surface of the drum is DELTA R, H and DELTA R satisfy the following expression.
0.5? H /? R? 1.0 11. The method of claim 10,
Wherein the disc portion includes an inclined surface whose one surface on which the protrusions are disposed is inclined downward from a central portion toward an outer circumferential side. 11. The method of claim 10,
Wherein the pulsator comprises a boss portion located at a center portion of the disk portion and connected to a shaft serving as a rotation axis,
Wherein the boss portion is made of a material different from the material of the disk portion. The method according to claim 1,
Wherein the control device controls the drive device such that the pulsator rotates in the same direction as the rotational direction of the drum during a dewatering stroke.

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