KR101123324B1 - Induction motor of washing machine - Google Patents

Abstract

The present invention relates to an induction motor of a washing machine, comprising: a stator for applying an alternating current power source to generate a rotating magnetic field; A plurality of cores disposed to face the stator and connected to the rotating shaft, upper and lower end rings formed on upper and lower portions of the core, and a plurality of penetrating along the circumference of the core such that both ends are connected to the upper and lower end rings. And a rotor formed of a skew formed to be inclined at a predetermined angle with respect to the rotation axis, wherein the rotor has an inclination angle of the skew and upper and lower end rings so that the magnitude of torque generated by the interaction with the rotating magnetic field is adjusted. Since at least one of the cross-sectional areas is adjusted, the output torque is changed only by simple structural change of the induction motor, so that the induction motor is shared and the efficiency of the induction motor is improved, the initial starting torque is set high, and the static torque is set low. Not only improves the washing, rinsing, There is an advantage in that vibration noise is reduced at the time of departure.

Washing Machine, Induction Motor, Stator, Rotor, End-Ring, Skew

Description

Induction motor of washing machine

1 is an internal configuration of a washing machine according to an embodiment of the present invention,

2 is an enlarged cross-sectional view of the main part of FIG. 1;

3 is an exploded perspective view illustrating an induction motor of a washing machine according to an embodiment of the present invention;

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a graph showing a torque change according to the rotation speed of the induction motor according to an embodiment of the present invention,

6 is a graph showing a change in efficiency according to the rotation speed of the induction motor according to an embodiment of the present invention,

7 is an internal configuration of a washing machine according to another embodiment of the present invention;

8 is a perspective view schematically showing an induction motor of a washing machine according to another embodiment of the present invention;

<Explanation of symbols on main parts of the drawings>

4: washing tank 6,72: induction motor

8,74: power train 10: outer tank

12: inner shell 14: pulsator

40,80: Stator 50,90: Rotating shaft

60,100: rotor 62: rotor frame

64: rotor bushing 66: rotor core

66A, 102: core 66B, 104: winding

67A, 104A: Upper end ring 67B, 104B: Lower end ring

67C, 104C: Skew W: Width of end ring

H: Height of end ring θ: Skew angle of skew

The present invention relates to a motor used in a washing machine, and more particularly, to an induction motor of a washing machine in which the output of the motor can be adjusted without large changes in appearance and capacity, thereby improving the efficiency of the motor and the washing performance of the washing machine.

In general, a washing machine is a device for washing laundry through a process such as washing, rinsing, and dehydrating to remove contamination from clothes, bedding, etc. (hereinafter referred to as "laundry") using water, detergent, and mechanical action.

Such a washing machine is rotatably installed in a cabinet in which water and detergent and laundry are accommodated inside the cabinet, and a motor for generating rotational power of the washing tub is installed at one side of the washing tank.

Therefore, the washing machine is a washing stroke of the laundry while the laundry and the detergent and water is put into the inside of the washing tank inverted left and right at a low speed by the motor, the washing process proceeds, the washing water used during the washing stroke is drained to the washing tank When clean water is supplied again, the washing tank is inverted left and right at low speed by the motor, and a rinsing cycle of the laundry proceeds, and after the washing water used in the rinsing cycle is drained, the washing tank is rotated at a high speed by the motor to dewater the stroke. This is going on.

On the other hand, as the motor used in the washing machine can be used in a variety of types, due to the characteristics of the washing machine is excellent in maneuverability, constant speed operation, the speed control motor is used.

Such motors are typical of DC motors and induction motors. The DC motors have advantages of excellent maneuverability and ease of speed control, while the induction motors have greater maneuverability and control convenience than the DC motors. Disadvantageous but the relatively constant speed characteristics, since the AC power supply is used directly there is an advantage that the rectifier can be omitted.

In recent years, the maneuverability and control convenience of induction motors have been greatly improved, and a lot of induction motors have been adopted in newly introduced washing machines.

The induction motor as described above is composed of a stator for generating a rotating magnetic field by applying AC power, and a rotor for generating an induction current by the rotating magnetic field of the stator and rotating by the interaction of the induction current and the rotating magnetic field.

In addition, the induction motor is classified into an outer rotor type and an inner rotor type according to the position of the rotor, and the outer rotor type has a structure that surrounds the outside of the stator so that the rotor can rotate. The inner rotor type is rotatably disposed inside the stator.

However, the induction motor of the washing machine according to the prior art requires a large starting torque to invert the washing tank left and right during the washing and rinsing stroke, and stable driving to operate the washing tank at a high speed for a predetermined time when the dewatering stroke is taken off. Torque is required.

The required values of starting torque and static torque vary depending on the washing capacity of the washing machine. However, since the induction motor has a structure that cannot be changed once the torque is set, the induction of various capacities and appearances depends on the washing capacity of the washing machine. There is a problem that the motors are used respectively.

In addition, when an induction motor having a smaller starting torque than the washing capacity of the washing machine is used, it is difficult to secure washing performance and rinsing performance during washing and rinsing strokes, thereby degrading the washing performance of the washing machine.

In addition, if an induction motor having a static torque that is too large compared to the washing capacity of the washing machine is used, there is a problem that noise vibration is generated when the dewatering stroke is rotated at too high speed compared to the capacity of the washing tank.

As described above, it is preferable that the induction motor of the washing machine has a high starting torque in washing and rinsing stroke, and a low static torque in the departure of the dehydrating stroke. Not only is it cumbersome to manufacture and use each according to the model, but there are also disadvantages in terms of cost.

The present invention was created in order to solve the above problems, the object of the present invention is that the torque can be changed without significantly changing the appearance and structure of the induction motor, the output is adjusted by a simple structure change washing machine of various capacity The present invention is to provide an induction motor of a washing machine that can be used in common, and efficiency can be improved.

In addition, another object of the present invention is to improve the washing and rinsing performance of the washing machine by changing the torque of the induction motor to have a high initial starting torque during the washing and rinsing stroke, and also to have a low static torque during the departure of the dehydration stroke, It is to provide an induction motor of a washing machine that can reduce the occurrence of noise and vibration when dehydration of.

Induction motor of the washing machine according to the present invention for realizing the above object is a stator for generating a rotating magnetic field by applying AC power; A plurality of cores disposed to face the stator and connected to a rotating shaft, upper and lower end rings formed on upper and lower portions of the core, and a plurality of penetrating along the circumference of the core such that both ends are connected to the upper and lower end rings. And a rotor formed of a skew formed to be inclined at a predetermined angle with respect to the rotation axis, wherein the rotor has an inclination angle of the skew and upper and lower end rings so that the magnitude of torque generated by the interaction with the rotating magnetic field is adjusted. At least one of the cross-sectional areas is characterized in that it is adjusted.

Here, the rotary shaft is connected to both ends of the rotor and the washing tank so that washing, rinsing, and dehydration of the laundry while the washing tank of the washing machine is rotated, the skew is such that the initial starting torque of the rotor is increased and the static torque is lowered. It is formed with a large angle of inclination.

The skew is inclined at an inclination angle of 16 degrees from the rotation axis.

In addition, both ends of the rotary shaft are connected to the rotor and the washing tank so that washing, rinsing, and dehydration of the laundry proceed as the washing tank of the washing machine rotates. The upper and lower end rings have an initial starting torque of the rotor, It is formed in a small cross section so that the torque is lowered.

The upper and lower end rings are formed with heights and widths of 2.3 mm and 5.3 mm.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is an internal configuration of a washing machine according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view showing the main part of Figure 1, Figure 3 is an induction motor of the washing machine according to an embodiment of the present invention 4 is a cross-sectional view taken along line AA of FIG. 3.

1 to 4, the washing machine according to an embodiment of the present invention, the cabinet 2 to form an exterior, rotatably installed in the cabinet 2 and the washing water and laundry is accommodated The washing tank 4 and the induction motor 6 which is disposed below the washing tank 4 to generate a rotational force for the washing operation of the laundry, and is installed between the induction motor 6 and the washing tank 4 It comprises a power transmission device 8 for transmitting a drive torque (Torque) of the induction motor (6) to the washing tank (4).

Here, the washing tub 4 is fixed to the inside of the cabinet 2 by the support member 16, and is fixed to the outer tub 10 in which the wash water is accommodated, and is rotatably installed in the outer tub 10. The laundry is accommodated and the inner tub 12 is formed with a plurality of handmade water passing through the washing water, and the pulsator 14 is rotatably installed on the inner bottom surface of the inner tank 12 to generate a rotational water flow of the washing water .

In addition, the power transmission device 8 is a device for selectively transmitting to the inner tank 12 and the pulsator 14 by adjusting the magnitude of the drive torque of the induction motor 6 according to the operation stroke of the washing machine (1). to be.

The power transmission device 8 as described above is fixed to the lower portion of the outer tub 10, the induction motor 6 is fastened to the lower end mounted in the housing 20, and installed so as to be rotatable inside the housing 20 And a gear train 22 having a planetary gear set 22A for decelerating the power of the induction motor 6 therein, and both ends of the gear train 22 and the inner tank 12, respectively, The washing shaft 26, which is formed to be hollow, has a dehydration shaft 24 and is rotatably disposed in a double shaft structure inside the dehydration shaft 24, and both ends are connected to the planetary gear set 22A and the pulsator 14, respectively. And a clutch mechanism 28 installed at the lower portion of the gear train 22 to control power transmission between the induction motor 6 and the gear train 22.

The housing 20 is provided with a plurality of bearings such that the gear train 22 and the dehydration shaft 24 are rotatably supported.

A lower portion of the gear train 22 is disposed to penetrate the rotation shaft 50 of the induction motor 6, and an upper end of the rotation shaft 50 penetrating the gear train 22 is connected to the planetary gear set 22A. Connected.

The dehydration shaft 24 has an upper end connected to an inner tank hub 12A fixed to a bottom surface of the inner tank 12, and a lower end is press-fitted to an upper portion of the gear train 22. The clutch mechanism 28 The power of the induction motor 6 transmitted to the gear train 22 by) is transmitted to the inner tank 12.

The clutch mechanism 28 includes a clutch motor 30 mounted on a bottom surface of the outer tub 10, a clutch lever 32 connected to one side of the clutch motor 30, and the other side of the clutch lever 32. And a clutch coupling 34 coupled and spline-coupled to the lower portion of the gear train 22 to move up and down.

The first clutch gear 34A engaged with the second clutch gear 66 of the induction motor 6 protrudes downward from the lower portion of the clutch coupling 34 as described above.

Therefore, when the clutch lever 32 is rotated by the clutch motor 30, the clutch coupling 34 is slidably moved up and down along the lower portion of the gear train 22 by the clutch lever 32. It is optionally coupled with the induction motor 6.

On the other hand, the induction motor 6 of the present embodiment is a motor of the outer rotor type (bar), the stator 40 is mounted to the lower portion of the housing 20 of the power transmission device 8 and generates a rotating magnetic field; Rotating shaft 50 disposed in the center of the stator 40 vertically and rotatably disposed on the gear train 22 so that the upper end is connected to the planetary gear set 22A of the power transmission device 8. And a rotor 60 connected to a lower end of the rotating shaft 50 and installed to surround an outer surface of the stator 40 so as to rotate at a predetermined driving torque by interaction with the rotating magnetic field. .

The stator 40 includes a ring-shaped stator core 42 in which a plurality of iron pieces are stacked, a coil 44 wound around the stator core 42, and an AC power is input thereto, and an upper surface of the stator core 42. And an insulator 46 mounted to cover the lower surface and performing an insulation function.

On the outer circumference of the stator core 42 as described above, a plurality of teeth 42A around which the coil 44 is wound protrudes at equal intervals along the circumference, and the power transmission device 8 is formed on the inner circumference of the stator core 42. A plurality of fastening portions 42B formed with fastening holes 42C to be fastened and fastened to the housing 20 by fastening bolts (not shown) are protruded to be spaced apart at equal intervals along the circumference.

The rotor 60 is formed in a structure surrounding the outer circumferential surface and the lower surface of the stator 40 and is fixed to the center of the lower surface of the rotor frame 62 and the rotor frame 62 installed to be spaced apart from the outside of the stator 40. Rotor core 66 is fixed to the lower end of the rotating shaft 50 and the inner circumferential surface of the rotor frame 62, the rotor core 66 is generated by interacting with the rotating magnetic field of the stator 40 is generated It consists of.

Here, the rotor frame 62 is formed in a cylindrical structure with an upper surface open, a rotor core fixing portion 62A, in which the rotor core 66 is seated and fixed, is formed on an inner circumferential surface thereof, and the rotor bushing 64 is fastened. A bushing fixing part 62B having a fastening hole 62C is fastened to the center of the lower surface to be fastened and fixed by the member 65.

The rotor frame 62 includes a plurality of ventilation holes 62D and blades 62E for blowing external air to the stator 40 and the rotor core 66 to prevent overheating of the induction motor 6. Is formed.

That is, since the temperature is increased in the stator 40 and the rotor core 66 by the heat loss when the induction motor 6 is driven, the stator 40 is formed by the plurality of ventilation holes 62D and the blade 62E. ) And the rotor core 66 are cooled, the degradation of the performance of the induction motor 6 is prevented in advance.

In addition, the rotor bushing 64 is formed around the bushing part 64A to which the lower end of the rotation shaft 50 is fixed, and the bushing part 64A, and the bushing fixing part 62B of the rotor frame 62. It is composed of a flange portion (64B) that is fixed to the seat.

The bushing part 64A is formed of a metallic material, and a lower end of the rotating shaft 50 is inserted and fixed, and the flange part 64B is injection molded from a plastic material between the bushing part 64A and the rotor frame 62. And the fastening member 65 is fastened to the bushing fixing part 62B.

The second fastening hole 64C is formed in the flange portion 64B so as to correspond to the fastening hole 62C of the bushing fixing portion 62B, and the clutch coupling ( The second clutch gear 64D is formed to engage with the first clutch gear 34A of 34.

The rotor core 66 includes a ring-shaped core portion 66A in which a plurality of iron pieces are stacked, and a winding portion 66B formed in the core portion 66A to serve as a path for induced current. .

The core portion 66A is seated and fixed to the rotor core fixing portion 62A of the rotor frame 62 such that a gap of a predetermined size exists between the stator 40 and the stator 40.

The winding portion 66B is a portion at which an induced current is generated by the rotating magnetic field of the stator 6 and torque is applied in the rotation direction by the interaction of the rotating magnetic field and the induced current. A plurality of upper end rings 67A and lower end rings 67B formed at upper and lower portions, and a plurality of inner end surfaces of the core portion 66A are connected to both ends of the upper end ring 67A and the lower end ring 67B. It consists of a skew 67C formed to penetrate up and down.

The upper end ring 67A and the lower end ring 67B are each formed in a ring shape along the circumference of the upper and lower surfaces of the core portion 66A, and the upper and lower ends of the upper end ring 67A. At least one of the lower portions of the ring 67B is formed to protrude a plurality of blades 67D for blowing outside air to the stator 40 and the rotor core 66.

A plurality of skews 67C are formed at positions spaced apart at equal intervals along the inner circumference of the core portion 66A, and both ends of the skew 67C are energized to the upper end ring 67A and the lower end ring 67B. It is connected to each other, it is formed to be inclined at a predetermined angle (θ) relative to the rotation axis (50).

The winding part 66B as described above is formed by die casting (die-casting) the aluminum core material or the magnet material on the core part 66A.

On the other hand, the induction motor 6 of the present invention is the size of at least one of the cross-sectional area (W × H) of the upper end ring 67A and the lower end ring 67B and the inclination angle (θ) of the skew 67C. The torque magnitude of the rotor 60 is adjusted by the rotating magnetic field and the induced current.

That is, the upper end ring 67A and the lower end ring 67B have a cross-sectional area (W × H) so that the starting torque transmitted to the rotation shaft 50 by the rotor 60 increases and the static torque decreases. It is preferable to form this small.

The width W of the upper end ring 67A and the lower end ring 67B is set to a value smaller than the width of the core portion 66A, and the width of the upper end ring 67A and the lower end ring 67B is reduced. The height H is set within the range in which the overall height of the induction motor 6 is not increased too much.

In addition, it is preferable that the skew 67C has a large inclination angle θ so that the starting torque transmitted to the rotation shaft 50 by the rotor 60 is increased and the static torque is reduced.

The inclination angle θ of the skew 67C is set within a range in which sufficient torque is secured by interacting with the rotating magnetic field of the stator 40, but is set to a value smaller than 45 degrees on the rotation shaft 50.

Therefore, the induction motor 6 of the present invention suitably adjusts the size of at least one of the cross-sectional area (W × H) of the upper end ring 67A and the lower end ring 67B and the inclination angle θ of the skew 67C. By adjusting, the magnitude of the starting torque and the static torque transmitted to the power transmission device 8 is optimized according to the washing capacity of the washing machine 1.

Generally, the domestic washing machine 1 has the upper end ring 67A and the lower end ring 67B having a height and a width of 2.3 mm and 5.3 mm, and the skew 67C is formed at an inclination angle θ of 16 degrees. do.

5 is a graph showing a torque change according to the rotational speed of the induction motor according to an embodiment of the present invention, Figure 6 is a graph showing a change in efficiency according to the rotational speed of the induction motor according to an embodiment of the present invention to be.

Looking at the operation of the washing machine according to the present invention configured as described above are as follows.

First, when power is applied to the washing machine 1 to drive the induction motor 6, the power generated in the induction motor 6 is transmitted to the power transmission device 8 through the rotating shaft 50, the power transmission The pulsator 14 or inner bath 12 is selectively driven by the apparatus 8 to proceed with the washing stroke, the rinsing stroke and the dehydration stroke.

Specifically, in the washing stroke and the rinsing stroke of the washing machine 1, the clutch motor 30 of the power transmission device 8 is operated to move the clutch coupling 34 upward by the clutch lever 32. The clutch coupling 34 is separated from the rotor bushing 64 of the induction motor 6 to release the power transmission state of the induction motor 6 and the gear train 22.

Therefore, the drive torque of the induction motor 6 is transmitted only to the planetary gear set 22A in the gear train 22 through the rotation shaft 50, and decelerated at an appropriate speed by the planetary gear set 22A. Then, the washing shaft 26 is transferred to the washing shaft 26, and the pulsator 14 is rotated by the washing shaft 26 to wash or rinse the laundry.

As described above, in the washing stroke and the rinsing stroke, the washing water is stored in the outer tub 10 and the pulsator 14 is reversed left and right at a low speed while the laundry is accommodated in the inner tub 12. A very large load is applied to the induction motor 6.

Therefore, it is preferable that the induction motor 6 has a large starting torque in the ALPM region accelerated at low speed.

In addition, in the dehydration stroke of the washing machine 1, the clutch coupling 34 is moved downward by the clutch motor 30 and the clutch lever 32 in a state where the wash water stored in the outer tub 10 is completely drained. The induction motor 6 and the gear train 22 are connected to allow power transmission.

Accordingly, the power of the induction motor 6 is transmitted to the planetary gear set 22A in the gear train 22 through the rotation shaft 50 and at the same time through the clutch coupling 34 to the gear train 22. The gear train 22 and the rotation shaft 50 are rotated together at the same speed.

When the power of the induction motor 6 is simultaneously transmitted to the gear train 22 and the rotating shaft 50 as described above, the rotating shaft 50 and the planetary gear set 22A rotate the washing shaft 26 and the The gear train 22 rotates the dehydration shaft 24.

At this time, since the gear train 22 and the rotation shaft 50 rotate together at the same speed, the deceleration function by the planetary gear set 22A in the gear train 22 is also stopped, and the gear train 22 and The rotary shaft 50 is rotated at high speed by the induction motor 6 to perform centrifugal dewatering of the laundry.

In particular, the dehydration step consists of a liver degassing step of centrifugal dehydration of the laundry including a predetermined amount or more of the wash water, and a main dewatering step in which the laundry from which a considerable amount of the washing water is removed in the liver desorption step is finally dewatered to AlPM higher than the liver degassing step.

In the intermittent step, the laundry includes not only a large amount of washing water but also a portion of the accelerated section than a section driven at a constant speed in a constant speed, so that the induction motor 6 takes some load, so that the induction motor 6 ) Preferably has a large starting torque in the high speed Gantal Alp. Area.

On the contrary, since the laundry includes only a small amount of washing water in the main step, the section in which the constant speed is driven at a constant AlpM than the accelerated section is mostly, and thus the induction motor 6 takes a small load, so that the induction motor 6 ) Preferably has a small static torque in the high speed shot-alarm area.

That is, in the dehydration step of the dehydration stroke, since the inner tank 12 and the pulsator 14 are accelerated to the high speed shot ALMP in a state in which the outer tank 10 and the laundry do not have washing water, the constant rotation is performed for a predetermined time. Although the induction motor 6 has a low static torque in the restraint AlPM area, there is little deterioration in dewatering performance, while vibration noise due to the high speed operation of the induction motor 6 is greatly reduced.

On the other hand, when the operation of the induction motor 6 according to the present invention, when the AC power is applied to the coil 44 of the stator 40, a rotating magnetic field is generated around the stator 40, the rotation magnetic field As a result, an induced current is generated in the rotor core 66 of the rotor 60 along the winding portion 66B.

In addition, torque is applied to the winding portion 66B of the rotor core 66 in the direction in which the rotor 60 rotates by the interaction between the rotating magnetic field and the induced current, and the rotation torque of the rotor core 66 is applied to the winding portion 66B. The rotor 60 is rotated by this.

The torque of the rotor 60 as described above is transmitted to the power transmission device 8 through the rotation shaft (50).

At this time, the induction motor 6 reduces the cross-sectional area (W × H) of the upper end ring 67A and the lower end ring 67B of the winding part 66B, or skews the winding part 66B. By increasing the inclination angle θ of the 67C, the starting torque is increased in the low ALPM region to be accelerated, and the static torque is reduced in the high ALPM region to be driven at constant speed.

That is, the cross-sectional area (W × H) of the upper end ring 67A and the lower end ring 67B and the inclination angle θ of the skew 67C are adjusted so that the output of the induction motor 6 is adjusted. The starting torque is set high in the degassing stage of the washing and rinsing and dehydrating operation, and the washing, rinsing, and decapsulating performance of the laundry is improved. do.

As described above, the induction motor 6 adjusts the cross-sectional area (W × H) of the upper end ring 67A and the lower end ring 67B and the inclination angle θ of the skew 67C. Since the output of the induction motor 6 is easily adjusted according to the washing capacity of 1), the common use of the induction motor 6 is realized.

Hereinafter, Table 1 shows optimized values (O) of the cross-sectional area (W × H) of the upper end ring 67A and the lower end ring 67B and the inclination angle θ of the skew 67C according to the washing capacity of a general household washing machine. 5 and 6 show the torque and efficiency (%) rotation for an induction motor having the cross-sectional area (W × H) and the inclination angle (θ) in Table 1, respectively. It is a graph shown according to the number (rpm).

Factor Non-optimum (N) Optimum (O) W × H (mm) 3 × 7.5 2.3 × 5.3 θ (°) 7.8 16

As shown in Table 1 and FIGS. 5 and 6, the induction motor O having the optimum cross-sectional area W × H and the inclination angle θ is accelerated compared to the non-optimized induction motor N. It is formed at high speed and low at high speed at constant speed.

That is, the optimized household washing machine (O) has a starting torque compared to the non-optimal household washing machine (N) in the section (A) where the washing and rinsing strokes are performed and the section (B) where the dehydration stroke is performed. It is formed relatively large, the static torque is formed relatively low compared to the non-optimal household washing machine (N) in the section (C) where the dehydration step is carried out.

Therefore, the optimized household washing machine (O) has a higher efficiency of the motor in the section (A) in which the washing and rinsing strokes are performed and in the section (B) in which the dehydration stroke is performed, compared to the non-optimized washing machine (N). Is increased.

In addition, the optimized household washing machine (O) is increased in efficiency between the motor 400 ~ 1300rpm is most of the dehydration in the section (C) where the dehydration step is carried out compared to the non-optimized washing machine (N), The motor's efficiency is reduced only between 1300 and 1800 rpm running at very high speed.

The domestic washing machine is not only short time to proceed to 1300 ~ 1800rpm, but also in the entire area between 1300 ~ 1800rpm only when the washing capacity is large, the efficiency of the step of removing the overall increase.

Even if the optimized washing machine (O) is set to a low static torque in the step of dewatering, the efficiency of the household washing machine (O) is very low. Therefore, the washing performance of the laundry is improved as a whole and the power consumption of the motor is also reduced. There is an advantage.

7 is an internal configuration diagram of a washing machine according to another embodiment of the present invention, Figure 8 is a cutaway perspective view schematically showing an induction motor of a washing machine according to another embodiment of the present invention.

For reference, the same reference numerals are given to the same or similar components as the exemplary embodiment of the present invention, and description thereof will be omitted.

The washing machine according to another embodiment of the present invention, as shown in Figure 7 or 8, the induction motor 72 in the lower side of the washing tank 4 consisting of the outer tank 10, the inner tank 12 and the pulsator 14 Is disposed, the power transmission device 74 for selectively transmitting the drive torque (Torque) of the induction motor 72 to the inner tank 12 and the pulsator 14 is the induction motor 72 and the washing tank (4) ) Is connected between.

That is, in the present embodiment, since other configurations except the induction motor 72 and the power transmission device 74 are configured in the same manner as in the embodiment, a detailed description thereof will be omitted.

The induction motor 72 is disposed at an arbitrary position below the washing tank 4, and the power transmission device 74 is formed by the induction motor 72, the belt 76, and the pulleys 78, 79. Power transmission is possible.

Therefore, since the induction motor 72 of the present embodiment receives less restriction on the installation space due to the electric field height than the one embodiment, an inner rotor type motor can be used.

The inner rotor type induction motor 72 is mounted below the outer tub 10 to generate a rotating magnetic field, and is disposed to penetrate vertically through the center of the stator 80 and the belt 76. The pulley 79 is connected to the rotary shaft 90 is formed at one end, and is fixed along the periphery between both ends of the rotary shaft 90 and rotated with a predetermined drive torque by interaction with the rotating magnetic field It is configured to include a rotor (100) rotatably installed inside the stator (80).

Here, the stator 80 includes a ring-shaped stator core 82 in which a plurality of iron pieces are stacked, and a coil 84 wound around the stator core 82 and inputting AC power. In the inner circumference of the core 82, a plurality of teeth 82A around which the coil 84 is wound protrudes at equal intervals along the circumference.

The rotor 100 is installed and fixed to the outer circumference of the rotation shaft 90 and is disposed to penetrate the inner center of the stator core 82 so as to be spaced apart from the plurality of teeth 82A by a predetermined interval.

The rotor 100 includes a cylindrical core portion 102 in which a plurality of iron pieces are stacked, and a winding portion 66B formed in the core portion 102 to serve as a path for induced current.

The winding part 104 includes an upper end ring 104A and a lower end ring 104B formed along edges at upper and lower portions of the core part 102, and the upper end ring 104A and lower end ring 104B. A plurality of skews 104C formed on the outer circumferential surface of the core part 102 so as to be connected to both ends thereof.

The upper end ring 104A and the lower end ring 104B are each formed in a ring shape along an edge around the top and bottom surfaces of the core portion 102.

A plurality of skews 104C are formed at positions spaced apart at equal intervals along the outer circumference of the core portion 102, and both ends of the skew 104C are energized to allow the upper end ring 104A and the lower end ring 104B to be energized. It is connected, and is formed to be inclined at a predetermined angle (θ) with respect to the rotation axis 90.

In particular, the induction motor 72 of the present invention is the size of at least one of the cross-sectional area (W × H) of the upper end ring 104A and the lower end ring 104B and the inclination angle (θ) of the skew 104C. The torque magnitude of the rotor 100 is adjusted by the rotating magnetic field and the induced current.

That is, the upper end ring 104A and the lower end ring 104B have a cross-sectional area (W × H) so that the starting torque transmitted to the rotation shaft 90 by the rotor 100 increases and the static torque decreases. It is preferable to form this small.

The width W of the upper end ring 104A and the lower end ring 104B is set to a value smaller than the radius of the core portion 102, and the width of the upper end ring 104A and the lower end ring 104B is lowered. The height H is set within the range in which the overall height of the induction motor 72 does not increase too much.

In addition, the skew 104C is preferably formed such that the inclination angle θ is large so that the starting torque transmitted to the rotation shaft 90 by the rotor 100 increases and the static torque decreases.

The inclination angle θ of the skew 104C is set within a range in which sufficient torque is secured by interacting with the rotating magnetic field of the stator 80, but is set to a value smaller than 45 degrees on the rotation shaft 90.

Therefore, the induction motor 72 of the present invention suitably adjusts the size of at least one of the cross-sectional area (W × H) of the upper end ring 104A and the lower end ring 104B and the inclination angle θ of the skew 104C. By adjusting, the magnitude of the starting torque and the static torque transmitted to the power transmission device 74 is optimized according to the washing capacity of the washing machine 70.

Generally, the domestic washing machine 70 has the upper end ring 104A and the lower end ring 104B having a height and a width of 2.3 mm and 5.3 mm, and the skew 104C is formed at an inclination angle θ of 16 degrees. do.

As described above, the induction motor of the washing machine according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited to the above embodiments and drawings, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. Of course it is possible.

Induction motor of the washing machine according to the present invention configured as described above is at least one of the inclination angle of the skew and the cross-sectional area of the upper, lower end ring is adjusted so that the size of the rotation torque is adjusted, the torque output only by a simple structural change of the induction motor Since is changed, the output of the motor can be easily adjusted according to the use conditions.

In addition, since the output is easily adjusted without greatly changing the appearance and size of the induction motor, there is an advantage that the induction motor is shared because one induction motor can be used in common in washing machines of various capacities.

In addition, since the output of the induction motor is appropriately adjusted according to the washing capacity of the washing machine, the efficiency of the induction motor is improved, the power consumption when using the induction motor is also reduced.

In addition, the induction motor has an increased initial starting torque during washing and rinsing and dehydrating strokes of the washing machine due to an increase in the inclination angle of the skew or a decrease in the cross-sectional area of the upper and lower end rings. There is an advantage that the over-rinsing performance and liver decay performance is improved.

In addition, since the inclination angle of the skew is increased or the cross-sectional area of the upper and lower end rings is reduced, the induction motor generates a lower static torque in the step of detaching the washing machine, thereby reducing vibration noise during centrifugal dehydration of the washing machine. There is an advantage that the reliability of the product is improved.

Claims (5)

A stator to which an AC power source is applied to generate a rotating magnetic field; A plurality of cores disposed to face the stator and connected to the rotating shaft, upper and lower end rings formed on upper and lower portions of the core, and a plurality of penetrating along the circumference of the core such that both ends are connected to the upper and lower end rings. And a rotor formed of a skew inclined at an angle with respect to the rotation axis, The rotor is an induction motor of the washing machine, characterized in that at least one of the inclination angle of the skew and the cross-sectional area of the upper and lower end rings is adjusted so that the amount of torque generated by the interaction with the rotating magnetic field is adjusted. The method of claim 1, Both ends of the rotating shaft are connected to the rotor and the washing tank so that washing, rinsing, and dehydration of the laundry proceed as the washing tank of the washing machine rotates. The skew is an induction motor of a washing machine, characterized in that the initial starting torque of the rotor is increased, and the static torque is reduced to a large inclination angle. The method of claim 2, The skew is induction motor of the washing machine, characterized in that formed inclined at an inclination angle of 16 degrees from the rotation axis. The method of claim 1, Both ends of the rotating shaft are connected to the rotor and the washing tank so that washing, rinsing, and dehydration of the laundry proceed as the washing tank of the washing machine rotates. The upper and lower end rings are induction motor of the washing machine, characterized in that formed in a small cross-sectional area so that the initial starting torque of the rotor is increased and the static torque is lowered. The method of claim 4, wherein The upper and lower end rings are induction motor of the washing machine, characterized in that formed in the height and width of 2.3mm and 5.3mm.

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