JP2011200273A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress vibration and noise by suppressing vibration of a water tub at the start of spin-drying and at the stationary time in a washing machine.SOLUTION: The washing machine includes: a bottomed cylindrical rotary drum 2; the water tub 3 which encloses the rotary drum; a motor 5; a washing machine casing 6 which resiliently supports a water tub unit 7 by a vibration-proofing damper 70; a vibration detecting means 40 disposed in the front on the upper surface of the water tub; and a control means 20 for controlling respective steps. The control means 20 vector-synthesizes vibration components in three-dimensional directions detected by a vibration detecting means 40, and computes a synthesized vibration value. The washing machine can cope with the abnormal vibration or abnormal noise in the water tub unit 7 by adjusting the acceleration of rotation of the motor 5 at the start of spin-drying, stopping/restarting the spin-drying operation and adjusting the reached rotational frequency of the motor 5 in the stationary time of spin-drying so that the synthesized vibration value is not more than a set allowable vibration value at the time of a prescribed rotational frequency or in a prescribed range of rotational frequency in the spin-drying operation after washing and rinsing steps or so that the frequency exceeding the allowable vibration value is suppressed to be a prescribed allowable frequency or lower.

Description

  The present invention relates to a washing machine that suppresses vibration of a water tank at the time of dehydration start-up and during steady operation, and suppresses vibration and noise.

  Conventionally, this type of washing machine has been proposed to detect the imbalance of the laundry in the rotating drum from the output signal detected by the vibration detection means fixed to the water tub (see, for example, Patent Document 1).

  FIG. 11 is a cross-sectional view showing a main configuration of a conventional drum-type washing machine described in Patent Document 1, and FIG. 12 shows the relationship between the unbalance of the drum-type washing machine and the phase difference of vibration components. It is a graph to show.

  In FIG. 11, a front side lid body 108 to a bottom portion of a rotating drum 101 in which a plurality of holes 102 are formed in a water tank 103 elastically supported by a vibration damping damper 105 as a suspension structure in a housing 106. The rotation axis direction is arranged so as to be inclined downward from the horizontal direction toward the back side.

  The rotating drum 101 constitutes a water tank unit 110 that is driven to rotate by a motor 109 fixed to the back of the water tank 103, and opens the lid 108 that can be freely opened and closed at the front side entrance / exit of the housing 106. The laundry can be taken in and out through the front opening 103 and the front opening of the rotary drum 101.

  Between the opening of the water tank 103 and the lid 108 provided at the inlet / outlet of the housing 106 containing the water tank unit 110, there is a pressure contact portion through an elastic seal member 111 such as rubber that seals between the two. Therefore, the water tank unit 110 has a configuration of a swingable vibrating body that is supported by the vibration proof damper 105 from the bottom of the casing 106 in a vibration proof manner.

  Further, an operation unit 112 and a control unit 113 for controlling each process such as rinsing, rinsing, and dehydration are disposed in front of the casing 106.

  In such a drum type washing machine, since the rotary drum 101 is horizontal or inclined as described above, when the laundry is stored in the rotary drum 101 and rotated, the laundry and water tend to be biased downward. Therefore, vibration is likely to occur. In particular, when performing a dehydration process in which the rotating drum 101 is rotated at a high speed to dehydrate the laundry, after the washing or rinsing process is completed, the laundry containing water is stored in the rotating drum, and the laundry Depending on the type, the fabric or the shape, the laundry tends to be gathered at the biased position of the rotary drum 101 during the rotation of the dehydration process. When the laundry is biased, a large vibration is generated in the water tank 103 containing the rotating drum 101, and abnormal vibration and abnormal noise are generated in the washing machine.

  An operation unit 112 and a control unit 113 for controlling each process such as rinsing, rinsing, and dehydration are disposed in front of the casing 106.

  In this type of drum-type washing machine, the rotational speed of the rotating drum is operated over a wide range of rotational speeds from low speed to high speed during the dehydration process, and if the laundry is unbalanced at that time, the rotational speed depends on the rotational speed. There may be a problem that a large run-out occurs in the drum, and it collides with the water tank and generates noise. In particular, when a large unbalance is distributed on the front side of the lid body 108 along the rotation axis, the swirl tends to occur more easily than when there is an unbalance on the rear side. This is because the rotating drum 101 has a cantilever structure with respect to the water tank 103 at the same time as a heavy and highly inertial component such as the motor 109 is disposed in the rear.

  As a technique corresponding to this, Patent Document 1 of the conventional example discloses that the vibration detection means 104 capable of detecting the vibration components in a plurality of directions of the water tank fixed to the upper outer wall of the water tank 103 outputs the output signals of the vibration components in the plurality of directions. Based on this, an imbalance of the laundry is detected, and an amplitude abnormality due to an imbalance abnormality can be dealt with.

  FIG. 12 is an example showing the relationship in Patent Document 1, and the difference in phase angle between the vibration in the X direction and the vibration in the Y direction of planes orthogonal to each other of the aquarium unit 110 detected by the vibration detection means 104 ( Degree) and the position of occurrence of unbalance, and if the difference in phase angle is large, it is determined that the position of occurrence of unbalance is ahead. Under the control of the control means 113, the clothes unwinding process and the spin speed In order to prevent damage to equipment due to abnormal vibration and to deal with noise.

JP 2006-311884 A

  However, in the conventional configuration, the aquarium unit 110 is a resonance target with respect to the vibration source of the rotating drum 101 as disclosed, and therefore, the aquarium unit 110 becomes the first due to the imbalance generated in the rotating drum 101. When resonating at the second resonance point, the entire aquarium unit 110 becomes abnormal vibration and abnormal noise is generated. In addition, this resonance may be transmitted from the lid body 108 to the housing 106 via the elastic seal member 111 to cause abnormal vibration. In addition, there is a possibility that abnormal vibration may be generated in any place regardless of whether the place of occurrence of imbalance is the front part or the rear part.

  For this, as in the technique described in Patent Document 1, the problem remains only by prioritizing and dealing with the imbalance occurring at the front part of the rotating drum, and it is also possible to deal with the unbalance that occurs over the whole. It becomes important.

  In particular, the vibration behavior of the rotating drum at the time of unbalance is because the rotating drum 101 has a cantilever structure that is rotatable with respect to the water tank 103 regardless of whether the unbalance occurs at the front part or the rear part. As disclosed in the conventional example, the front portion of the rotating drum 101 swings more greatly than the back portion (rear portion). When 110 resonates, the front side of the water tank 103 is greatly vibrated, and damage may occur at the joint between the water tank 103 and the structure such as the rotating drum 101 and the motor 109. It had the problem that.

  The present invention solves the above-described conventional problems, and detects vibration components in the three-dimensional directions of the front, back, top, bottom, left and right of the water tank, calculates the vibration components, and controls the motor to thereby obtain abnormal vibration, It aims at providing the washing machine which prevents abnormal noise.

  In order to achieve the above object, a drum-type washing machine according to the present invention includes a rotating drum for stirring clothes formed in a bottomed cylindrical shape, a water tank containing the rotating drum rotatably, and a back part of the water tank. A fixed motor that rotationally drives the rotating drum, a washing machine housing that elastically supports a rotating water tank unit such as the rotating drum, water tank, and motor by a vibration-proof damper, and an upper front portion of the water tank The vibration detecting means for detecting the vibration component provided in the control unit and the control means for controlling each process such as rotation of the motor, washing, rinsing, dehydration, etc. The left and right three-dimensional vibration components are vector-synthesized to calculate a combined vibration value, and this combined vibration value is determined at a predetermined rotation speed or a predetermined rotation speed range in the dehydrating operation after the washing and rinsing process. Allowable vibration set The rotation acceleration of the motor at the start of dehydration, and the dehydration operation stop and restart, and the dehydration steady state so that the number of times exceeding the allowable vibration value or less than the predetermined allowable number is suppressed. It is intended to adjust the ultimate rotational speed of the motor.

  As a result, the vibration force of the entire aquarium unit can be reduced to cope with abnormal vibration and abnormal noise.

  Needless to say, depending on the number of revolutions, a longer operation time is instructed to ensure the dewatering rate to ensure the dewatering performance.

  According to the present invention, the rotational acceleration of the motor at the start of dehydration based on the combined vibration value obtained by vector synthesis of the vibration components in the three-dimensional directions of the front, rear, top, bottom, left and right detected by the vibration detection means. Thus, abnormal vibration and abnormal noise can be avoided by adjusting the rotation speed, stopping and restarting the dehydration operation, and adjusting the rotation speed reached by the motor during steady dehydration.

Sectional drawing which shows the principal part structure of the washing machine which concerns on embodiment of this invention Block diagram of the control circuit of the washing machine Correlation diagram between the combined vibration value calculated from the elapsed time when the vibration of the water tank of the washing machine is small and the vibration component of the water tank and the allowable vibration value Correlation diagram between the elapsed time when the vibration of the water tank of the washing machine is large in the primary resonance region, the combined vibration value calculated from the vibration component of the water tank, and the set allowable number of times when the allowable vibration value is exceeded Correlation diagram between the combined vibration value calculated from the elapsed time when the vibration of the water tank of the washing machine is large in the secondary resonance region and the vibration component of the water tank and the allowable vibration value Correlation diagram between the combined vibration value calculated from the elapsed time when the vibration of the washing machine's water tank is large in the steady rotation range and the vibration component of the water tank, and the allowable vibration value Correlation diagram between the elapsed operation time and the motor rotation speed when the vibration of the water tank of the washing machine is small Interrelation diagram between the elapsed time of operation and the motor speed when the vibration of the washing machine's water tank is large in the primary resonance range Correlation diagram between the elapsed driving time and the motor rotation speed when the water tank vibration of the washing machine is large in the secondary resonance range Correlation diagram between operation elapsed time and motor rotation speed when vibration of water tank of washing machine is large in steady rotation range Sectional drawing which shows the principal part structure of the conventional drum type washing machine Graph showing the relationship between unbalance and phase difference of vibration components of the drum type washing machine

  A first invention includes a rotating drum for clothes stirring formed in a bottomed cylindrical shape, a water tank that rotatably includes the rotating drum, a motor that is fixed to a back portion of the water tank and that rotationally drives the rotating drum, , A washing machine housing that elastically supports a vibration water tank unit such as the rotating drum, water tank, and motor by a vibration proof damper, and a vibration detection that detects a vibration component provided at an upper front portion of the water tank. Means and control means for controlling each process such as rotation, washing, rinsing, and dehydration of the motor, and the control means is arranged in the three-dimensional directions of the front, rear, top, bottom, left and right detected by the vibration detection means. The synthesized vibration value is calculated by vector synthesis of the vibration components, and this combined vibration value is less than the set allowable vibration value at the predetermined rotational speed point or the predetermined rotational speed range in the dehydrating operation after the washing and rinsing process. Or Adjustment of the rotational acceleration of the motor at the start of dehydration, stop and restart of the dehydration operation, and adjustment of the reached rotation speed of the motor at the time of steady dehydration so that the number of times exceeding the vibration value is suppressed to a predetermined allowable number or less. Thus, abnormal vibration and abnormal noise in the resonance region and steady region of the water tank can be avoided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a main configuration of a washing machine according to an embodiment of the present invention, and FIG. 2 is a block diagram of a control circuit of the washing machine.

  1 and 2, the drum type washing machine 1 houses a water tank unit 7 in a washing machine housing 6 so as to be swingable. The water tank unit 7 has a bottomed cylindrical rotating drum 2 in the water tank 3. The rotary shaft 2a of the rotary drum 2 is supported by a bearing 68 provided on the back surface of the water tank 3, and a motor 5 for driving the rotary drum 2 is connected to the rotary shaft 2a on the bearing 68. ing. That is, the rotating drum 2 has a cantilever structure with respect to the water tank 3.

  The rotating drum 2 is arranged together with the water tank 3 so that the direction of the rotating shaft 2a is horizontal or the inclined direction downward from the horizontal direction from the front side to the back side which is the bottom. Since the water tank unit 7 has heavy components such as the bearing 68 and the motor 5 attached to the back side thereof, the position of the center of gravity G is closer to the back side (motor 5 side).

  Therefore, the aquarium unit 7 is supported by the anti-vibration damper 70 on the lower side closer to the front side than the position of the center of gravity G, and the upper support fitting 75 fixed to the upper part of the aquarium 3 and the upper surface of the washing machine casing 6 The water tank unit 7 is urged toward the front side by the first coil spring 71 installed between them, and further, between the back surface below the support height position by the vibration damper 70 and the back surface of the washing machine housing 6. A second coil spring 72 is installed. As a result, the aquarium unit 7 supported by the anti-vibration damper 70 closer to the front side than the position of the center of gravity G is urged counterclockwise in the figure, so that the state where the water tank unit 7 falls to the rear side is corrected. The support structure has a high vibration effect.

  In particular, the support position Q and the center of gravity G by the anti-vibration damper 70 are on the rear side with respect to the center position S in the direction orthogonal to the rotation shaft 2a of the rotary drum 2, and moreover, between the center position S and the support position Q. The distance L1 is greater than the distance L2 between the center position S and the center of gravity G (L1> L2), and the support tank Q is not behind the center of gravity G when viewed in the direction of gravity, but has a condition of being located near the front. The vibration on the back side and the rear side of the unit 7 is easily suppressed.

  A vibration detecting means 40 such as a three-dimensional acceleration sensor is attached to the front surface of the aquarium 3 to detect the acceleration and determine the amplitude of the vibration behavior of the front portion of the aquarium 3 during dehydration.

  In addition, there is a sealing property between the front of the water tub 3 and the front surface of the washing machine housing 6 so that water and splashes during washing, rinsing, and dehydration do not pass into the washing machine housing 6 and the lid body 9. In addition, an elastic seal member 41 made of a material such as rubber that absorbs vibration of the water tank 3 is provided.

  In addition, a water injection pipe 12 and a drain pipe 13 are connected to the water tank 3, and water supply or drainage into the water tank 3 is performed by controlling the water supply valve 14 and the drain valve 13.

  The drum type washing machine 1 of the present embodiment controls a series of operation operations including washing, rinsing, dewatering, and drying based on an instruction input from a user and monitoring of an operation state of each part. Control means 20 is provided.

  In FIG. 2, the control means 20 rectifies AC power 31 by a rectifier 32, and DC power smoothed by a smoothing circuit constituted by a choke coil 33 and a smoothing capacitor 34 is used as drive power to drive the motor 5 by an inverter circuit 26. The operation instruction input from the input setting means 21 and the monitoring of the operation state detected by each detection means such as the water level detection means 16 for detecting the water level in the water tank 3 and the cloth amount detection means 30 Based on the information, the rotation of the motor 5 is controlled, and the load driving means 37 controls the operation of necessary loads such as the water supply valve 14, the drain valve 13, the blower fan 17, the first heater 18, and the second heater 19. Information input from the input setting means 21 is displayed on the display means 35 to inform the user.

  The motor 5 includes a stator having three-phase windings 5a, 5b, and 5c and a rotor having a two-pole permanent magnet, and is configured as a DC brushless motor provided with three position detection elements 24a, 24b, and 24c. The rotation is controlled by a PWM control inverter circuit 26 constituted by the switching elements 26a to 26f.

  The rotor position detection signals detected by the position detection elements 24a, 24b, and 24c are input to the control means 20, and the on / off states of the switching elements 26a to 26f are PWM-controlled by the drive circuit 25 based on the rotor position detection signals. Thus, energization of the three-phase windings 5a, 5b, and 5c of the stator is controlled to rotate the rotor at a required rotational speed.

  The control means 20 detects the cycle each time the signal state of any of the three position detection means 24a, 24b, 24c changes, and the rotational speed detection means 24 uses the rotational speed of the rotor as an internal function based on the period. Calculated by

  As described above, the rotating drum 2 of the water tank unit 7 elastically supported as described above has a cantilever structure, and the direction of the rotating shaft 2a is horizontal or inclined, so that the laundry is stored. In the dehydration process of dehydrating the laundry by rotating the rotating drum 2 at a high speed of 1000 to 1600 rpm, the laundry or water tends to be biased downward when rotating in the After completion of the washing or rinsing process, the laundry containing water tends to gather at a biased position of the rotary drum 2 depending on the type, fabric or shape.

  When the laundry is biased, a large vibration is generated in the water tub 3 containing the rotary drum 2 and abnormal vibration and abnormal noise are generated in the washing machine. In addition, the press-contact portion of the washing machine housing 6 and the water tank unit 7 by the elastic seal member 41 is relatively hard in order to ensure a sufficient sealing pressure that does not allow water or splashes to pass during washing, rinsing, and dehydration. Therefore, the vibration of the water tub 3 can be easily transmitted to the washing machine casing 6 as well. It becomes a resonance object.

  Since the water tank unit 7 has a resonance target structure of vibration from the rotary drum 2, the rotation speed of the rotary drum 2 is the first resonance point near 120 rpm, the second resonance point near 250 rpm, and further 1000 rpm or more. It has a third resonance point, and it is necessary to prevent abnormal vibration of the entire aquarium unit 7 due to these resonance points.

  Therefore, in the present embodiment, the motor at the start of dehydration is based on the combined vibration value obtained by vector synthesis of the vibration components in the three-dimensional directions of the front, rear, upper, lower, left and right detected by the vibration detection means 40. By adjusting the rotational acceleration of 5, stopping and restarting the dehydration operation, and adjusting the reached rotation speed of the motor during steady dehydration, abnormal vibration and abnormal noise can be avoided.

3 to 6, the horizontal axis represents the elapsed time of the dehydration operation, and the vertical axis represents the combined vibration value calculated from the vibration component of the water tank 3 output from the vibration detection means 40 provided in the water tank 3. The combined vibration value is calculated by the control unit 20 from the following equation as a vector combined value in the three-dimensional directions of the front and rear, the left and right, and the top and bottom of the water tank 3.
Synthetic vibration value = ((longitudinal vibration value) ² + (horizontal vibration value) ² + (vertical vibration value) ² ) ^1/2

  Line α is an allowable vibration value up to about 120 rpm, which is the first resonance point area of the aquarium unit 7, line β is an allowable vibration value around 250 rpm, which is the second resonance point area of the water tank unit 7, and line γ is a steady rotation. This is the allowable vibration value in the region.

  In FIG. 3, line A shows a case where the vibration of the water tank 3 is small, and the combined vibration value of the water tank 3 does not reach the lines α, β, and γ that are vibration allowable values. That is, since vibration and noise are in a good state, the rotational acceleration to the motor 5 and the reached rotational speed (800 rpm) remain at the initial settings.

  In FIG. 4, line B shows the case where the vibration of the water tank 3 exceeds the permissible vibration value up to the first resonance point region by a predetermined permissible number of times (four times). The value exceeds the allowable vibration value line α up to the first resonance point range five times. For this reason, the control means 20 stops energization to the motor 5, corrects the clothing imbalance in the rotary drum 2, and then restarts dehydration.

  In FIG. 5, line C shows the case where the vibration of the water tank 3 exceeds the allowable vibration value in the second resonance point region, and the combined vibration value of the water tank 3 is the allowable vibration up to the first resonance point region as shown in the figure. Although it exceeds the value line α three times, it is less than the predetermined allowable number of four times, so that it passes through this rotation region and reaches the second resonance point region. At this time, since the combined vibration value of the water tank 3 exceeds the line β, which is the allowable vibration value in the second resonance point range, a predetermined allowable number of times (0 times), the control means 20 reduces the rotational acceleration to the motor 5 to zero. As a result, the combined vibration value of the water tank 3 temporarily falls below the line β that is the allowable vibration value in the second resonance point region. Next, since the control means 20 adjusts the rotational acceleration to the motor 5 to a value smaller than the initial value, the combined vibration value of the water tank 3 again exceeds the line β, which is the allowable vibration value in the second resonance point range. The control means 20 stops energization to the motor 5, corrects the clothing imbalance in the rotary drum 2, and then restarts dehydration.

  In FIG. 6, line D shows the case where the vibration of the water tank 3 exceeds the allowable vibration value in the steady rotation range, and the combined vibration value of the water tank 3 is the allowable vibration value line up to the first resonance point area as shown in the figure. Although α is exceeded 3 times, but is less than the predetermined allowable number of 4 times, it passes through this rotation region and reaches the second resonance point region. Even at this time, the combined vibration value of the water tank 3 is the second resonance value. Since it is below the line β, which is the allowable vibration value in the point area, this rotation area also passes through and reaches the steady rotation area. At this time, since the combined vibration value of the water tank 3 exceeds the line γ, which is an allowable vibration value in the steady rotation range, the control means 20 adjusts the rotation speed reached to the motor 5 to be lower than the initial rotation speed. This is done so that the combined vibration value of the water tank 3 is kept below the line γ which is the allowable vibration value in the steady rotation range.

  FIG. 7 to FIG. 10 show how the dehydration operation elapsed time and the rotational speed of the motor 5, that is, the rotational behavior of the rotary drum 2 change by controlling as described above.

  7 to 10, the horizontal axis represents the dehydration operation elapsed time, and the vertical axis represents the rotational speed of the rotary drum 2 provided in the water tank 3. The figure also shows the transition of rotational acceleration.

  In FIG. 7, line a shows the behavior of the rotational speed of the rotating drum 2 when the combined vibration value of the water tank 3 changes in a state where the vibration shown in FIG. 3 is small, up to the first resonance point region. Rotation increases with a low slope (rotational acceleration is small: rotational acceleration 1), passes through the first resonance point area, passes through the second resonance point area, and reaches a steady rotation area with a high initial inclination ( In a state where the rotational acceleration is large: rotational acceleration 3> rotational acceleration 2> rotational acceleration 1), the rotation increases, and constant rotation is maintained at the original steady rotational speed (predetermined steady rotational speed: steady rotational speed 1).

  In FIG. 8, the line b indicates that the combined vibration value of the water tank 3 exceeds the allowable vibration value up to the first resonance point region when the vibration illustrated in FIG. 4 exceeds the predetermined allowable number of times (four times). The behavior of the rotational speed of the rotary drum 2 when the vibration up to the first resonance point range is large is shown, and the initial low slope (rotation acceleration is small: rotation acceleration) up to the first resonance point range. Although the rotation rises in 1), the rotation of the rotating drum 2 is stopped (operation stopped) after reaching the first resonance point range. Then, the rotation of the clothing imbalance correction is performed and dehydration is restarted.

  In FIG. 9, the line c indicates that the combined vibration value of the water tank 3 is greater when the vibration shown in FIG. 5 exceeds the allowable vibration value in the second resonance point range, that is, the vibration in the second resonance point range is large. The behavior of the rotational speed of the rotating drum 2 when it changes in the state is shown, and the first and second resonance point areas are from the initial low (rotational acceleration is small: rotational acceleration 1) to the high inclination (rotational acceleration). Is increased: Rotational acceleration 2> Rotational acceleration 1), and the rotation rises. However, after reaching the second resonance point range, the rotation of the rotating drum 2 stops accelerating (rotational acceleration is zero) and temporarily maintains a constant rotation. After that, it tries to increase at a smaller inclination (rotational acceleration is in the middle state: rotational acceleration 4 <rotational acceleration 2), but immediately stops (stops operation). Then, the rotation of the clothing imbalance correction is performed and dehydration is restarted.

  In FIG. 10, the line d indicates that the combined vibration value of the water tank 3 has shifted to a state where the vibration shown in FIG. 6 exceeds the allowable vibration value in the steady rotation range, that is, the vibration in the steady rotation range is large. The behavior of the rotational speed of the rotating drum 2 at the time is shown, and the first and second resonance points and the steady rotational range are temporarily lowered from the initial low state (rotational acceleration is small: rotational acceleration 1) to a higher inclination (rotational acceleration). Is increased: Rotational acceleration 3> Rotational acceleration 2> Rotational acceleration 1). After reaching the steady rotational range, the rotation of the rotating drum 2 stops accelerating (rotational acceleration zero), The control means 20 adjusts to a negative rotational acceleration (rotational acceleration 5) so that the motor 5 has a rotational speed smaller than the initial rotational speed, and the rotational speed of the rotary drum 2 decreases (negative rotational acceleration: Rotational acceleration ) It is intended to. Thereafter, when the combined vibration value becomes equal to or less than the allowable vibration value, the rotation speed (the adjusted steady rotation speed: steady rotation speed 2 <steady rotation speed 1) is maintained.

  In this way, based on the combined vibration value obtained by combining the output values in the three-dimensional direction of the vibration detection means, the control means adjusts the rotational acceleration of the motor and the rotation speed reached at the time of dehydration (steady rotation speed), thereby The vibration force of the water tank unit in the resonance area and the steady area of the unit can be suppressed, and abnormal vibration and abnormal noise in the resonance area and the steady area of the water tank unit and the housing can be avoided.

  In addition, since vibration values are combined into vectors to obtain combined vibration values, the magnitude of all vibration behaviors can be grasped with a single absolute value, which can not only improve the efficiency of verification and simplify the program, but also improve development efficiency. In addition, tolerance and program reliability can be improved, and a highly reliable washing machine can be provided.

  Needless to say, when the steady rotational speed is lowered, the operation time during dehydration to compensate for the dewatering rate is adjusted.

  In the present embodiment, the horizontal drum type washing machine has been described. However, the same effect can be obtained with a vertical type washing machine.

  The washing machine of the present invention is useful as a washing machine that detects vibrations of a water tank by vibration detection means and suppresses vibrations by motor control means.

2 Rotating drum 3 Water tank 5 Motor 6 Washing machine casing 7 Water tank unit 20 Control means 40 Vibration detection means 70 Vibration damping damper

Claims (1)

A rotating drum for stirring clothes formed in a bottomed cylindrical shape, a water tank that rotatably includes the rotating drum, a motor that is fixed to the back of the water tank and that rotates the rotating drum, the rotating drum, and the water tank A washing machine housing in which a vibration water tank unit such as a motor is elastically supported swingably by a vibration isolating damper, a vibration detecting means for detecting a vibration component provided in the upper front portion of the water tank, Control means for controlling each process such as rotation, washing, rinsing, dehydration, etc., and the control means vector-synthesizes vibration components in the three-dimensional directions of the front, rear, top, bottom and left and right detected by the vibration detection means. Then, the combined vibration value is calculated, and the combined vibration value is less than or equal to the set allowable vibration value at the predetermined rotation speed or in the predetermined rotation speed range in the dehydrating operation after the washing and rinsing process. Value exceeded Adjustment of the rotational acceleration of the motor at the start of dehydration, stop and restart of the dehydration operation, and adjustment of the reached rotation speed of the motor at the time of steady dehydration so that the number of times is suppressed to a predetermined allowable number or less. Washing machine.

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