JP3188143B2 - Centrifugal dehydrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal dewatering apparatus for storing laundry in a dehydration basket such as a drum and rotating the dehydration basket at a high speed about a rotating shaft to dehydrate the laundry.

[0002]

2. Description of the Related Art A centrifugal dehydrator in a drum type washing machine, which is one type of this type of centrifugal dehydrator, stores laundry containing water in a basket-shaped drum and places the drum around a horizontal axis. It is structured to rotate at high speed. In such a centrifugal dehydrator, when the drum is rotated at high speed while the laundry is unevenly distributed inside the drum, abnormal vibration occurs due to imbalance of the mass distribution around the rotation axis. A centrifugal dewatering device for solving this problem is disclosed in Japanese Patent Application Laid-Open No. Hei 3-215289. In the centrifugal spin-drying device, during the spin-drying process, the rotation speed of the motor after a predetermined time has elapsed from the start of the motor for rotating the drum containing the laundry at a high speed is detected. When the rotation speed is equal to or lower than the predetermined value, it is determined that the rotation of the drum is not normal, and the power supply to the motor is stopped.

[0003]

However, in the above-mentioned conventional centrifugal dehydrator, the rotational speed of the drum is once increased to near the steady rotational speed of the motor.
When the drum has a large eccentric load, occurrence of abnormal vibration is inevitable. Further, when the drum has an extremely large eccentric load, rotating the drum at a high speed even in a short time causes a large load on the motor, which may cause a failure.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide an apparatus which is capable of abnormal vibration even if a dehydration process is started in a state where laundry contained in a dehydration basket is unevenly distributed. It is another object of the present invention to provide a centrifugal dehydrator capable of avoiding the occurrence of noise and abnormal noise, and capable of performing a dehydration operation after automatically correcting the uneven distribution of the laundry.

[0005]

A first centrifugal dewatering apparatus according to the present invention, which has been made to solve the above-mentioned problems, comprises rotating a dewatering basket containing laundry at a high speed about a rotating shaft. A centrifugal dewatering device for dewatering the goods, a) a motor for rotating the dewatering basket, b) detecting means for detecting a magnitude of an eccentric load caused by uneven distribution of the laundry in the dewatering basket, c) Determining means for determining whether a value detected by the detecting means is equal to or greater than a predetermined value; d) determining means for determining a maximum rotation speed during dehydration based on a value detected by the detecting means; and e) the motor. , The centrifugal force acting on the laundry is greater than gravity
Abnormal vibration even in a large area and unevenly distributed laundry
When the eccentric load is determined to be greater than or equal to a predetermined value by the determination means during the rotation, the rotation speed of the motor is reduced.
Then, the motor is rotated so as to stir the laundry in the dewatering basket, and when it is determined that the eccentric load is smaller than a predetermined value, the motor is rotated by the determining means at the first rotation speed. Rotation speed control means for rotating the motor at the determined maximum rotation speed.

First, the rotation speed control means starts the motor in a stopped state, and controls the motor so as to increase the rotation speed to a low first rotation speed. The first rotation speed is a rotation speed in a range where the centrifugal force acting on the laundry is greater than gravity, and a relatively low rotation speed that does not cause abnormal vibration even if the laundry is unevenly distributed. Therefore, the laundry rotates together with the rotation of the dewatering basket while being pressed against the peripheral wall surface in the dewatering basket. In the rotating state, the detecting means detects the magnitude of the eccentric load of the laundry, and the determining means determines whether or not the detected value is equal to or larger than a predetermined value. If the detected value is equal to or more than the predetermined value, it is determined that the unevenness of the laundry is large, and if the rotation speed is increased in that state, the possibility of occurrence of abnormal vibration is high. In this case, the rotation speed control means temporarily lowers the rotation speed of the motor and performs a correction operation of the eccentric load.
That is, an operation is performed such that the entangled laundry is loosened in the dewatering basket and the laundry is uniformly dispersed in the dewatering basket.

When the detected value of the eccentric load when the motor is rotated at the first rotation speed is smaller than a predetermined value, the rotation speed of the motor is increased to the rotation speed at which dehydration is performed. The maximum rotation speed for dehydration is determined by the determining means based on the magnitude of the detected value of the eccentric load when the motor is rotated at the first rotation speed. That is, when the eccentric load is small, the rotation speed is set to a high value with emphasis on dehydration performance, and when the eccentric load is relatively large, the rotation speed is set to a relatively low speed so as not to cause abnormal vibration.

[0008] A second centrifugal dewatering device according to the present invention is a centrifugal dewatering device for dewatering laundry by rotating a dehydration basket containing laundry at a high speed about a rotation axis. A) a motor for rotating b) a detecting means for detecting a magnitude of an eccentric load caused by the uneven distribution of the laundry in the dewatering basket; and c) whether a value detected by the detecting means is equal to or more than a predetermined value. Determination means for determining the maximum rotation speed during dehydration based on the value detected by the detection means, e) the motor, the centrifugal force acting on the laundry than the gravity
Abnormal vibration even in a large area and unevenly distributed laundry
When the eccentric load is determined to be greater than or equal to a predetermined value by the determination means during the rotation, the rotation speed of the motor is reduced.
The motor is rotated so as to stir the laundry in the dehydrating basket, and when it is determined that the eccentric load is smaller than a predetermined value, the rotation speed of the motor is set to be lower than the first rotation speed. Rotation speed control means for rotating the motor at a maximum rotation speed determined by the determination means based on the eccentric load detected by the detection means during the rotation. It is characterized by:

[0009] In the second centrifugal dehydrator, the maximum rotational speed for dehydrating is the magnitude of the eccentric load detected when the motor is rotated at a second rotational speed higher than the first rotational speed. Is determined based on That is, the rotation speed control means increases the rotation speed of the motor to the second rotation speed when the detected value of the eccentric load when the motor is rotated at the first rotation speed is smaller than a predetermined value. . Then, the maximum rotation speed is determined based on the magnitude of the eccentric load detected by the detection means when the motor is rotating at the second rotation speed.

[0010] A third centrifugal dehydrator according to the present invention comprises a first centrifugal dehydrator.
Alternatively, in the second centrifugal dewatering device, the dewatering basket is a basket-shaped drum that is rotated around a horizontal axis, and the rotation speed control unit is configured to rotate the motor at a first rotation speed. When it is determined that the value detected by the detection means is equal to or greater than a predetermined value, the centrifugal force acting on the laundry inside the drum is rotated by rotating the drum at a rotation speed in a range smaller than gravity. It is characterized by stirring the laundry.

When the drum is rotated at the rotation speed as described above, the laundry carried upward from the bottom along the inner peripheral wall of the drum with the rotation falls downward during the rotation. Therefore, the laundry entangled and solidified inside the drum is loosened and dispersed.

[0012] The fourth centrifugal dehydrator according to the present invention, the first, the second or third centrifugal dehydrator, before Symbol rotational speed control means, the phase control which determines the timing of intermittent alternating current The drive voltage applied to the motor is controlled by controlling the angle, and the detecting means detects the eccentricity based on the amount of change in the phase control angle while the rotation speed control means rotates the motor at a constant speed. It is characterized by detecting a load.

In a phase control type motor drive in which the magnitude of the phase control angle that determines the timing of turning on / off the alternating current intermittently is controlled, the motor is controlled to rotate at a constant speed. In this case, the phase control angle fluctuates in accordance with the rotation fluctuation of the motor, that is, the rotation unevenness. The fluctuation amount of the phase control angle is proportional to the magnitude of the rotation fluctuation of the motor. When the laundry in the dewatering basket is unevenly distributed, the rotational torque of the motor varies according to the unevenly distributed state, and thus the rotational speed also varies. Therefore, the uneven distribution state of the laundry can be determined based on the variation amount of the phase control angle.

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

As described above, according to the first and second centrifugal dewatering devices, even if the dewatering process is started with the laundry in the dewatering basket unevenly distributed, the dewatering basket remains in that state. Since it is not rotated at high speed, it is possible to avoid occurrence of abnormal vibration and abnormal noise. Further, when the uneven distribution of the laundry is large, the dehydration operation is performed after the laundry is automatically dispersed. Further, an effective dewatering operation is performed in accordance with the degree of dispersion of the laundry.

Further, according to the third centrifugal dehydrator, especially in a centrifugal dehydrator using a drum, when the unevenness of the laundry inside the drum is large, the laundry is effectively dispersed. Therefore, occurrence of abnormal vibration can be reliably avoided.

Further, according to the fourth centrifugal dehydrator, the magnitude of the eccentric load can be easily and reliably detected.
Generation of abnormal vibration and abnormal noise can be reliably avoided. Further, an appropriate dehydration operation can be selected according to the degree of dispersion of the laundry.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] FIG. 1 is a block diagram of an electric system of a drum type centrifugal dehydrator according to a first embodiment (hereinafter, referred to as "embodiment 1") of the present invention, and FIG. FIG. 3 is a flow chart for explaining a procedure of a dehydration process in the first embodiment, FIG. 4 is a waveform diagram for explaining a motor driving operation, and FIG. 5 is an uneven distribution of laundry inside a drum. And FIG. 6 is a diagram for explaining the rotation speed during the spin-drying operation.

First, the overall structure of the drum type washing machine will be described with reference to FIG. An outer tub 52 for storing water during the washing and rinsing steps is arranged inside the outer box 50 of the washing machine body. Inside the outer tub 52, a drum 20 for storing laundry is supported by a main shaft 60 and installed.
The laundry is thrown at zero. A water hole 58 is formed in the peripheral wall of the drum 20, and water supplied to the outer tub 52 flows into the drum 20 through the water hole 58, and water dehydrated from laundry in the drum 20. Is discharged to the outer tank 52. A baffle 56 is provided inside the drum 20 to lift the laundry from below to above with the rotation.
The main shaft 60 is held by a bearing 62 mounted on the outer tub 52, and a main pulley 64 is further mounted thereon. A motor 18 for rotating and driving the drum 20 is disposed below the outer tub 52, and a motor pulley 68 is attached to a rotating shaft of the motor 18. The rotation of the motor pulley 68 is transmitted to the main pulley 64 through the belt 66.

The water for washing and rinsing is supplied by the water supply port 7.
Water is supplied from outside through 0, and the amount of water is adjusted by a water supply solenoid valve 72. The water supplied from the water supply port 70 becomes detergent water through the detergent inlet 74 during the washing process and is poured into the outer tub 52 during the rinsing process, and is poured into the outer bath 52 without passing through the detergent inlet 74 during the rinsing process. Can come off. The water after washing or rinsing or dewatered water in the outer tub 52 is drained through the drain port 76. The drain port 76 is opened and closed by a drain solenoid valve 78. The motor 18 is supplied with a drive voltage from the circuit unit 80. The circuit section 80 houses an electric circuit as described later, and controls the rotation of the motor 18 and the operations of the water supply electromagnetic valve 72 and the drain electromagnetic valve 78.

Next, the configuration and operation of the electric system of the centrifugal dehydrator will be described with reference to FIG. The control unit 10 mainly composed of a microcomputer is a central control unit 10
2. It includes a rotation speed control unit 104, a detection / judgment unit 106, and a memory 108. The memory 108 stores in advance an operation program for advancing the washing, rinsing, and dehydrating steps of the laundry. The operation program includes various values required for operation, such as the time for rotating the DC motor 18 and the rotation speed, in addition to the operation procedure.

The user performs a key operation from the operation unit 12 to designate a dehydration operation mode, for example, a type of the fiber of the laundry stored in the drum 20 and the like. In response to the key operation, the central control unit 102 reads out the corresponding operation program from the memory 108, and executes the operation program to advance the dehydration process. Central control unit 102
Also includes a display control function for performing display on the display unit 14.

The motor drive circuit 16 includes an AC power supply 161,
The rotation speed control unit 10 includes an AC switch circuit 162, a rectifier circuit 163, and a phase angle control circuit 164.
4 and a monitor signal from the rotation speed detector 22 are input to the phase angle control circuit 164.
The phase angle control circuit 164 determines a control angle α described later so that the rotation speed of the DC motor 18 becomes the rotation speed specified by the rotation speed designation signal, and outputs the control angle α to the AC switch circuit 162 as a control angle designation signal. The control angle instruction signal is also input to the detection / judgment unit 106 to detect the rotation fluctuation of the motor 18. The DC drive voltage generated by the motor drive circuit 16 is applied to the motor 18, and the rotation of the motor 18 is transmitted to the drum 20 as described above.

The motor drive circuit 16 generates a drive voltage as follows. From the AC power supply 161, a sine-wave single-phase AC voltage indicated by a solid line (phase angle 0 ° to 180 °) and a broken line (phase angle 180 ° to 360 °) in FIG. 162. The AC switch circuit 162 is constituted by a gate-controlled semiconductor switch such as a triac, and performs full-wave rectification of the AC current and switches the AC current according to the control angle instruction signal. That is, as shown in FIG. 4B, a switching pulse signal is generated at a position delayed from the position at the phase angle 0 ° by the control angle α, the current is interrupted during the phase angle 0 ° to α, and α
The gate-controlled semiconductor switch is controlled so as to conduct current during a period of up to 180 °. As a result, the voltage indicated by the hatched portion in FIG. 4A is input to the rectifier circuit 163. This intermittent voltage is smoothed by the rectifier circuit 163 and applied to the motor 18 as a drive voltage.

Therefore, in the motor drive circuit 16, the control angle α is reduced when the drive voltage is to be increased, that is, when the rotational speed of the motor 18 is to be increased, and conversely, when the drive voltage is to be reduced, that is, when the motor 18 When it is desired to reduce the rotation speed, the control angle α is increased. Therefore, the control angle α, that is, the control angle instruction signal is
Is a parameter that reflects the rotation fluctuation of.

Hereinafter, the rotation control of the motor during the dewatering process will be described with reference to FIG. First, when the dehydration operation is started in response to a key operation from the operation unit 12, the rotation speed control unit 10
4 outputs a rotation speed designation signal such that the rotation speed of the motor 18 gradually increases to a predetermined low rotation speed (first rotation speed) N1. As a result, the drive voltage applied to the motor 18 gradually increases, and the rotation speed of the motor 18 gradually increases (step S10). Here, the first rotation speed N1 is set so that the centrifugal force acting on the laundry inside the drum 20 becomes a rotation speed in a range larger than the gravity, for example, when the diameter of the drum 20 is 500 [mm]. Then, the rotation speed of the motor is set so that the rotation speed of the drum 20 becomes about 100 [rpm].

The rotation speed of the motor 18 is equal to the first rotation speed N
If it reaches 1 (step S11), the first time
Is maintained at the rotation speed N1 (step S12). The detection / determination unit 106 measures the maximum fluctuation width wa of the control angle α during the fixed time (step S13). And
The state of uneven distribution of the laundry inside the drum 20 is determined based on the fluctuation width wa (step S14). That is,
If the fluctuation width wa is smaller than the predetermined value w1, the uneven distribution of the laundry is small, and it is determined that abnormal vibration does not occur even if the rotation speed is increased in this state. On the other hand, the fluctuation width w
If a is equal to or greater than the predetermined value w1, the uneven distribution of the laundry is large,
If the rotation speed is increased in this state, it is determined that the possibility of occurrence of abnormal vibration is high.

Therefore, when wa ≧ w1, the rotation speed control unit 104 outputs a rotation speed designating signal for lowering the rotation speed of the motor 18, or once the motor 18
The drive speed of the motor 18 is reduced by interrupting the drive current to the motor 18 (step S20). Subsequently, an eccentric load correcting operation for correcting the uneven distribution by promoting the dispersion of the laundry inside the drum 20 is performed (Step S).
21).

As shown in FIG. 5, the eccentric load correction operation is performed at a rotation speed (third rotation speed) N3 at a low speed enough to wash the laundry, for 10 seconds in the right direction, and then for 3 seconds.
The drum 20 is rotated leftward for 10 seconds with a rotation direction reversal period of 2 seconds. Here, the third rotation speed N3 is set so that the centrifugal force acting on the laundry inside the drum 20 is a rotation speed in a range smaller than gravity.
The rotation speed of the motor is such that the rotation speed of 0 is about 50 [rpm]. When the drum 20 is rotated in this manner, in the inside of the drum 20, the laundry conveyed upward from the bottom along the inner peripheral wall surface of the drum 20 with the rotation falls downward during the rotation. Further, by rotating the drum 20 left and right, “relaxation” of the laundry entangled inside the drum 20 is promoted, and dispersion is performed. The method of the eccentric load correction operation is not limited to this, and it is desirable to appropriately change the method according to the amount of laundry, the height of the baffle 56, and the like.

After performing the eccentric load correction operation, the rotation speed control unit 104 outputs a rotation speed designation signal such that the rotation speed of the motor 18 increases again to the first rotation speed N1. Then, the processes from steps S10 to S14 described above are executed, and it is determined again whether or not the uneven distribution of the laundry has been eliminated.

When the fluctuation width wa is smaller than the predetermined value w1, the rotation speed control unit 104 controls the rotation of the motor 18 so that the rotation speed of the motor 18 becomes the predetermined medium rotation speed (second rotation speed) N2. Outputs the speed designation signal. Therefore, the motor 1
8, the drive voltage increases, and the rotation speed increases (step S15). Here, the second rotation speed N2 is
For example, the rotation speed of the motor is such that the rotation speed of the drum 20 is about 700 [rpm].

The rotation speed of the motor 18 is equal to the second rotation speed N
When the number reaches 2 (step S16), the detection / determination unit 10
In step 6, similarly to step S13, the maximum fluctuation width wb of the control angle α during the fixed time is measured (step S17).
Then, the maximum rotation speed and the rotation time according to the fluctuation width wb are determined (step S18), and the dehydration operation is performed with the determined values (step S19). That is, the relationship between the fluctuation width wb and the drum maximum rotation speed and rotation time as shown in FIG. 6 is stored in the memory 108 in advance,
The maximum rotation speed and the rotation time are selected based on the measured fluctuation width wb. According to this, it can be determined that the smaller the fluctuation width wb, the smaller the uneven distribution of the laundry. Therefore, the spinning of the drum 20 (that is, the motor 18) at a higher rotation speed for a short time causes the dehydration. Conversely, the fluctuation width w
If b is large, it can be determined that the uneven distribution of the laundry is insufficiently eliminated, and if the drum 20 is rotated at high speed, it is highly likely that abnormal vibration will occur. That is, sufficient spin-drying performance is ensured by rotating the motor 18).

In the above embodiment, the rotation speed at the time of spin-drying is determined based on the maximum fluctuation width wb of the control angle.
The determination may be made based on the maximum fluctuation width wa at the first rotation speed N1. However, when the rotation speed gradually increases and dehydration from the laundry proceeds, the state of the eccentric load may slightly change, so the final rotation speed at the time of dehydration is determined at the maximum rotation speed Is more preferable.

[Second Embodiment] Hereinafter, a second embodiment (hereinafter referred to as "second embodiment") in which a method of detecting the magnitude of an eccentric load caused by uneven distribution of laundry is different from that of the first embodiment will be described. I do. In the second embodiment, the determination of the uneven distribution state of the laundry is performed based on the fluctuation of the rotation speed of the motor. FIG. 7 is an electrical block diagram of the centrifugal dehydrator according to the second embodiment. The difference from FIG. 1 is that a pulse generator 24 is provided in association with the motor 18 and that the configuration of the motor drive circuit 16, that is, the method of driving the motor 18 is not particularly limited.

The pulse generator 24 detects fluctuations in the rotation speed of the motor 18 that occur during one rotation of the drum 20. The pulse generator 24 has the same rotation angle during one rotation of the drum 20, ie, 360 °. A pulse generating element is provided so that at least two or more pulse signals are generated at intervals. For example, when the pulse generator 24 is configured to obtain a pulse signal every time the drum 20 rotates 45 °, when the drum 20 makes one rotation without a change in the rotation speed, FIG. As shown, eight pulse signals of equal width are obtained. However, when the rotation speed fluctuates while the drum 20 makes one rotation, as shown in FIG.
The pulse width fluctuates. When the drum 20 has an eccentric load, the rotation torque fluctuates during one rotation, so that the rotation speed also fluctuates, so-called uneven rotation occurs. Therefore, the fluctuation of the pulse width during one rotation of the drum 20 is detected, and the eccentric load is determined based on the magnitude of the fluctuation.

FIG. 9 is a flowchart for explaining the procedure of the dehydration step in the second embodiment. In FIG.
Steps S33, S34, S37 different from the processing of FIG.
Only the processing of S38 will be described below.

While the rotation speed of the motor 18 is maintained at the first rotation speed N1 for a certain period of time, the detection / determination means
The maximum pulse width Pmax and the minimum pulse width Pmin during one rotation period of the drum 20 obtained from the pulse generator 24 are measured, and the pulse width ratio Pa = Pmax / Pmin is calculated (step S33). Next, whether the eccentric load correction operation needs to be performed is determined by comparing the pulse width ratio Pa with a predetermined value P1 (step S3).
4). That is, when the pulse width ratio Pa is equal to or greater than P1, the uneven distribution of the laundry is large, and it is determined that the laundry needs to be dispersed. Further, while the rotation speed of the motor 18 is maintained at the second rotation speed N2 for a certain period of time, the maximum pulse width Pmax and the minimum pulse width Pmin are measured as in step S13, and the pulse width ratio Pb = Pmax / Pmin
Is calculated (step S37). Then, the drum maximum rotation speed and rotation time according to the pulse width ratio Pb are determined (step S38).

In the second embodiment, the maximum pulse width P
The difference between the maximum pulse width Pmax and the minimum pulse width Pmin may be used instead of the ratio between max and the minimum pulse width Pmin.

[Embodiment 3] In the third embodiment (hereinafter referred to as "Embodiment 3"), the uneven distribution state of the laundry is determined based on the fluctuation of the rotation speed of the drum 20. FIG.
FIG. 4 is a layout view of a reed switch attached to the outside of the drum 20 and the inside of the outer tub 52 to detect fluctuations in the rotation speed of the drum 20. FIG. 10 is a view of the drum 20 and the outer tub 52 viewed from the back side of the washing machine, that is, the direction of the mounting surface of the main shaft 60. A magnet 40 is provided outside the drum 20.
The two reed switches 18 are provided inside the outer tank 52 at a position facing the magnet 40 when the drum 20 rotates.
Mounted with a 0 ° rotation angle.

Accordingly, the drum 20 is rotated once, that is, 360 times.
° While rotating, each reed switch 41a, 4
1b is turned on one time by the action of the magnet 40. Then, it is configured to output a pulse signal when conducting. FIGS. 11A and 11B are diagrams showing pulse signals obtained corresponding to the conduction of the reed switches 41a and 41b, respectively. If the rotation speed does not fluctuate during one rotation of the drum 20, the time ta from when the reed switch 41a is turned on to when the reed switch 41b is turned on is ta.
Is equal to the time tb from when the reed switch 41b is turned on to when the reed switch 41a is turned on. When the rotation speed of the drum 20 fluctuates, the time ta and the time tb are not equal, and a time difference occurs according to the magnitude of the fluctuation of the rotation speed. Therefore, while the motor 18 is being rotated at the first rotation speed N1 for a certain period of time, the time ta
And the time tb are measured, and the uneven distribution state of the laundry is determined based on the ratio or difference. That is, the second embodiment
Instead of the pulse width ratios Pa and Pb, ta / tb or ta−
By using tb, an effect similar to that of the second embodiment can be expected.

In the third embodiment, the magnet is provided on the drum itself to detect the fluctuation of the rotation of the drum. However, the third embodiment is configured to detect the fluctuation of the rotation of the main pulley 64 which rotates in conjunction with the drum. Has the same effect. Further, the rotation fluctuation of the drum or the main pulley may be detected using an optical switch having a light emitting unit and a light receiving unit.

[Modifications] The eccentric load detection methods in the first to third embodiments can be used in combination. That is, the processes in step S14 and step S18 in FIG. 3 may be performed based on different eccentric load detection methods.

In the above description, the present invention is applied to a drum type washing machine. However, the present invention can be applied to a spiral type electric washing machine in which a dewatering basket is rotated about a vertical axis. In particular, when performing an eccentric load correction operation with a spiral electric washing machine, do not control the rotation speed of the dehydration tub, but rotate the rotor used for washing after supplying a small amount of water. It is preferable that the laundry is stirred and dispersed.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electric system of a centrifugal dehydrator according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a washing machine provided with a centrifugal dehydrator.

FIG. 3 is a flowchart for explaining a procedure of a dehydrating operation in the first embodiment.

FIG. 4 is a waveform chart for explaining a motor driving operation according to the first embodiment.

FIG. 5 is an explanatory diagram of the operation of rotation control when correcting uneven distribution of laundry.

FIG. 6 is a diagram for explaining a rotation speed during dehydration in the first embodiment.

FIG. 7 is a block diagram of an electric system of a centrifugal dehydrator according to a second embodiment of the present invention.

FIG. 8 is a waveform chart for explaining a method of detecting an eccentric load in the second embodiment.

FIG. 9 is a flowchart illustrating a procedure of a dehydrating operation according to the second embodiment.

FIG. 10 is a configuration diagram for explaining an eccentric load detection method according to a third embodiment of the present invention.

FIG. 11 is a waveform chart for explaining a method of detecting an eccentric load according to the third embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Control part 104 ... Rotation speed control part (rotation speed control means) 106 ... Detection / determination part (detection means, determination means, and determination means) 16 ... Motor drive circuit (rotation speed control means) 161 ... AC power supply 162 ... AC Switch circuit 163 Rectifier circuit 164 Phase angle control circuit 18 Motor 20 Drum 22 Revolution detector 24 Pulse generator 40 Magnet 41a, 41b Reed switch

Continued on the front page (72) Inventor Tomoya Kawaguchi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Inventor Kenji Nakagawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo (56) References JP-A 5-161775 (JP, A) JP-A 7-112094 (JP, A) JP-A 64-40094 (JP, A) (58) Fields studied (Int .Cl. ⁷ , DB name) D06F 49/04 D06F 33/02

Claims (4)

(57) [Claims] 1. A centrifugal dehydrator for spinning a dewatering basket by rotating a dehydration basket containing laundry at a high speed about a rotation axis, wherein: a) a motor for rotating the dehydration basket; Detecting means for detecting the magnitude of the eccentric load caused by the uneven distribution of the laundry in the basket; c) determining means for determining whether a value detected by the detecting means is equal to or greater than a predetermined value; d) Determining means for determining the maximum rotation speed during dehydration based on the value detected by the detecting means; ande) controlling the motor so that centrifugal force acting on the laundry is greater than gravity.
Abnormal vibration even in a large area and unevenly distributed laundry
When the eccentric load is determined to be greater than or equal to a predetermined value by the determination means during the rotation, the rotation speed of the motor is reduced.
Then, the motor is rotated so as to stir the laundry in the dewatering basket, and when it is determined that the eccentric load is smaller than a predetermined value, the motor is rotated by the determining means at the first rotation speed. A centrifugal dehydrator, comprising: a rotation speed control unit configured to rotate the motor at the determined maximum rotation speed. 2. A centrifugal dehydrator for spinning dehydration of laundry by rotating a dehydration basket containing laundry at a high speed about a rotation axis, wherein: a) a motor for rotating the dehydration basket; Detecting means for detecting the magnitude of the eccentric load caused by the uneven distribution of the laundry in the basket; c) determining means for determining whether a value detected by the detecting means is equal to or greater than a predetermined value; d) Determining means for determining the maximum rotation speed during dehydration based on the value detected by the detecting means; ande) controlling the motor so that centrifugal force acting on the laundry is greater than gravity.
Abnormal vibration even in a large area and unevenly distributed laundry
When the eccentric load is determined to be greater than or equal to a predetermined value by the determination means during the rotation, the rotation speed of the motor is reduced.
The motor is rotated so as to stir the laundry in the dehydrating basket, and when it is determined that the eccentric load is smaller than a predetermined value, the rotation speed of the motor is set to be lower than the first rotation speed. Rotation speed control means for rotating the motor at a maximum rotation speed determined by the determination means based on the eccentric load detected by the detection means during the rotation. A centrifugal dehydrator characterized by the above-mentioned. 3. The dewatering basket is a basket-shaped drum that is rotated about a horizontal axis, and a value detected by the detection means when the motor is rotated at a first rotation speed is not less than a predetermined value. If it is determined that there is, the rotation speed control means agitates the laundry by rotating the drum at a rotation speed in a range where the centrifugal force acting on the laundry inside the drum is smaller than gravity. The centrifugal dehydrator according to claim 1 or 2, wherein: 4. A pre-Symbol rotational speed control means controls the drive voltage applied to the motor by controlling the phase control angle which determines the timing of intermittent alternating current, the detecting means, the rotational speed 4. The centrifugal dehydrator according to claim 1, wherein the control means detects an eccentric load based on a variation amount of the phase control angle while the motor is rotating at a constant speed.