JP3692667B2 - Washing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention suspends and supports the outer tub on the outer frame of the washing machine by a hanging rod, and supports the rotational speed and vibration amplitude of the dehydrating and washing tub in the outer tub so as to rotatably support the dehydrating and washing tub. The present invention relates to a washing machine including detection means for detecting.
[0002]
[Prior art]
JP-A-5-146579 discloses an outer tub suspended from a frame (outer frame) in an anti-vibration manner, a dewatering / washing tub provided in the outer tub, and a bottom of the dehydration / washing tub. A washing machine having a pulsator (rotary blade) is disclosed. A motor is disposed at the bottom of the outer tub of the washing machine, and the rotational force generated by the motor is transmitted to a bearing incorporating the clutch device via a pulley and a belt. The clutch device of the bearing is switched so as to rotate only the rotating blades during washing or rinsing and to rotate the dewatering / washing tub and the rotating blades together during dehydration.
[0003]
Furthermore, this washing machine includes a magnet fixed to a pulley attached to the input shaft of the bearing, and a reed switch that is provided on the bearing main body side and that is turned on every time the magnet passes through the vicinity. A rotation sensor for detecting the number of rotations is configured. The number of rotations detected by the rotation sensor is transmitted to a control circuit disposed in an operation unit located at the upper part of the washing machine and used for controlling the number of rotations.
[0004]
Japanese Patent Laid-Open No. 8-71290 discloses a structure of a washing machine in which a shaking detection unit for detecting a displacement (vibration amplitude) of a dehydrating and washing tub is provided on an upper part of a hanging rod for suspending an outer tub. ing. The detection unit of this washing machine includes a ferrite plate, which is a magnetic body, attached at right angles to the upper part of a support bar (hanging bar), and a U-shaped coil in which a coil is wound around a U-shaped ferrite core. The inductance of the U-shaped coil is detected when the attached ferrite plate enters and exits between the opposing parallel surfaces of the U-shaped coil. For this purpose, the U-shaped coil is fixed to the outer frame.
[0005]
[Problems to be solved by the invention]
As in the washing machine described in JP-A-5-146579, a rotation sensor is provided at the bottom of the outer tub, that is, at the bottom of the washing machine, and a control circuit for processing the output of the rotation sensor is provided at the top of the washing machine. If it is disposed in the operation unit located, a long wiring is required between the rotation sensor and the control circuit.
[0006]
A long wiring between the rotation sensor and the control circuit is not preferable for improving work efficiency during assembly. In addition, since it is a washing machine that uses water, it is necessary to consider the waterproofness of the wiring.
[0007]
Also, the washing machine has a source of electromagnetic noise such as a motor, and long wiring tends to pick up electromagnetic noise, which is not preferable from the viewpoint of signal processing. That is, it is necessary to consider the influence of electromagnetic noise, such as configuring a filter for removing noise in the control circuit or the like.
[0008]
Such considerations lead to an increase in the number of parts and cost, and even if a means for removing the effects of electromagnetic noise such as filters is added, electromagnetic noise can be removed without deteriorating the signal components that are originally required. There is no guarantee that it can. This problem of electromagnetic noise is not only caused by the inside of the washing machine, but also the influence of electromagnetic noise from the outside can be considered.
[0009]
Also, the lower part of the washing machine is generally open, and the dust is likely to enter, so the sensor is likely to get dirty. In addition, when the washing machine is placed outdoors, moisture intrusion from below is conceivable, so it is necessary to consider moisture. Furthermore, it is conceivable that water that has entered the washing machine for some reason, such as dew condensation, travels along the outer peripheral surface of the outer tub or falls in the space to wet the rotation sensor disposed below the outer tub. . These problems are not preferable for improving reliability.
[0010]
On the other hand, in the washing machine described in Japanese Patent Application Laid-Open No. 8-71290, the entire shake detection unit that detects the displacement (vibration amplitude) of the dehydration and washing tub is configured on the outer frame side. Therefore, a washing machine having a structure in which the operation unit and the control circuit are configured on the top cover side and assembled to the washing machine main body, that is, the outer frame side, is not preferable for improving work efficiency during assembly. In addition, it is necessary to increase the number of connectors, and it is necessary to provide wiring for assembly work.
[0011]
Further, in the above-described washing machine, only the detection of the displacement of the shaking of the dehydrating and washing tub, that is, the vibration amplitude is disclosed, and the number of rotations of the dehydrating and washing tub is detected, or the dehydrating and washing is performed with one sensor. No consideration was given to detecting the vibration amplitude and rotation speed of the tank.
[0012]
SUMMARY OF THE INVENTION An object of the present invention is to provide a washing machine having a sensor for detecting a physical quantity associated with rotation of a dewatering and washing tub so that assembly work efficiency can be improved.
[0013]
[Means for Solving the Problems]
  In order to achieve the above object, the washing machine of the present invention comprises:In a washing machine comprising an outer frame, an outer tub supported by the outer frame via a plurality of suspension bars, and a dehydration tub / washing tub rotatably supported in the outer tub, A magnetic field generating means fixed to the suspension rod side at the upper end; and a magnetic flux change detecting means disposed opposite to the magnetic field generating means, the shaft of the suspension bar being centered on the magnetic field generating means A ring magnet substantially matched on the line, rotation detection means for detecting the rotation speed and rotation vibration amplitude of the dewatering tub and washing tub from the output of the magnetic flux change detection means, and based on the output of the rotation detection means The rotation of the dewatering tub / washing tub is controlled.
[0014]
  In the above washing machine, an amplifier for amplifying the output of the magnetic flux change detection means, a filter for removing noise from the signal amplified by the amplifier, and a signal from which noise has been removed by the filter compared with a predetermined threshold value And a smoothing circuit for converting the signal rectified by the rectifier circuit into an envelope signal, and from the output of the comparator circuit, The rotational speed of the tub may be detected, and the rotational vibration amplitude of the dewatering tub / washing tub may be detected from the output of the smoothing circuit.
[0015]
Moreover, it is good to provide the top cover installed in the upper part of the said outer frame, and to arrange | position the said magnetic flux change detection means to the said top cover.
[0016]
  The dewatering tub / wash tub may be controlled to stop rotating when the rate of change of the rotational vibration amplitude exceeds a predetermined value.
[0017]
  Further, the dewatering tub / washing tub may be controlled so as to decrease the rotational speed when the rotational vibration amplitude during steady rotation during dehydration becomes greater than a predetermined value..
[0020]
The above-mentioned predetermined value is allowed depending on, for example, the strength of the components of the washing machine and the relationship between the inside of the washing machine main body and the outer tub or the gap between the outer tub and the dehydrating tub / washing tub. It may be determined based on the vibration amplitude.
[0022]
In the above description, the upper end portion of the suspension bar is upward from the point supported by the outer frame. In addition to the suspension rod portion, the upper cover (top cover) of the washing machine in the vicinity of the suspension rod extended upward. Including the inside. At this time, in the structure having the receiving portion and the receiving seat on the outer frame and the suspension rod, the point supported by the outer frame is the outer frame receiving seat of the hanging rod supported by the receiving portion of the outer frame. .
[0023]
Hereinafter, the dehydrating and washing tub will be described simply as a dehydrating tub.
[0024]
By providing means for detecting the rotation speed (number of rotations) of the dehydration tank and / or means for detecting the vibration amplitude at the upper end of the suspension rod, the wiring between the detection means and the control circuit can be shortened. This makes it difficult to pick up electromagnetic noise. Moreover, since it is not necessary to extend the wiring with the inside of the washing machine facing downward, it is easy to deal with waterproofing. Furthermore, even in a structure where the lower part of the washing machine is open, there is little dust or the like that soars to the upper part inside the washing machine, and particularly large or heavy garbage does not soar, making it difficult for dust and dirt to adhere.
[0025]
Of the means for detecting the vibration amplitude and / or rotational speed of the dehydration tank, if the circuits to which voltage is applied and the wiring through which current flows are collected in the top cover, it becomes easier to shield and waterproof from electromagnetic noise. . At the time of assembly, only a top cover is attached to the main body, and wiring or the like is not required. Further, the sensor can be separated from the main body together with the control circuit by simply removing the top cover at the time of disassembly.
[0026]
Further, when controlling the motor in the washing machine described above, for example, the detected rotation speed is fed back to control the phase of the motor, and the dehydration rotation speed is kept the same regardless of the commercial power supply frequency, or the detected vibration amplitude is When the predetermined value is exceeded, it is determined that there is a possibility of collision between the outer tub and the outer frame, and it is preferable to perform control so as to stop the spin-drying rotation. Or when the vibration at the time of dehydration steady rotation becomes large, you may make it reduce noise by reducing the dehydration rotation speed by phase-controlling a motor.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0028]
FIG. 1 is a longitudinal side view showing an embodiment of a fully automatic washing machine according to the present invention. The washing machine body includes an outer frame 1, a top cover 2 installed on the upper portion of the outer frame 1, an outer tub 3, and a dehydration held by the outer tub 3 by a clutch 4 and rotatably supported around a vertical shaft 4a. A combined washing tub (hereinafter referred to as a dehydrating tub) 5, a rotary blade 6 supported rotatably with respect to the dehydrating tub 5, and a drive motor 7 that transmits power to the vertical shaft 4 a of the clutch 4 via a belt or the like. And four suspension rods 8 a, 8 b, 8 c, and 8 d that suspend and support the lower end portion of the outer tub 3 at the four corners of the upper end portion of the outer frame 1.
[0029]
Inside the top cover 2, a coil 9, a control board 10, and an operation board 11 wound around a ferrite core constituting the rotational vibration detecting means of the present invention are installed. The coil 9 is connected to a voltage processing circuit 9 a provided in the control board 10. The control board 10 is provided with a buzzer 12, and the operation board 11 is provided with a display 13 and operation buttons 14. A user operates the washing machine with the operation buttons 14 from the upper surface of the top cover 2, and the operation state thereof is determined. It can be confirmed with the display 13 and the buzzer 12. A ring magnet 15 constituting the rotational vibration detecting means of the present invention is fixed to the upper part of one of the four suspension rods 8a, and a coil 9 is disposed in the top cover 2 positioned above the ring magnet 15. ing.
[0030]
FIG. 2 is a plan view of the washing machine main body with the top cover 2 removed and seen from above, and FIG. 3 shows details of the suspension bar 8a on which the rotational vibration detecting means of the present invention is installed.
[0031]
The upper and lower ends of the suspension bar 8a are bent into an L shape, and an outer tank receiving seat 16a as a vibration isolating mechanism portion is provided at the lower end portion, and an outer frame receiving seat 17a provided with a ring magnet 15 is provided at the upper end portion. ing. The outer tub receiving seat 16a includes a lower spring receiving seat 18a and an upper spring receiving seat 19a that are held by the bent lower end portion of the hanging rod 8a, and a hanging rod is inserted between the spring receiving seats 18a and 19a. A vibration absorber (spring spring) 20a is attached. A rubber plate 21a is provided on the lower spring seat 18a so as to contact the inner wall of the outer tank seat 16a.
[0032]
On the other hand, a circular ring magnet 15 is installed in the outer frame receiving seat 17a. The center of the ring magnet 15 is aligned with the axial direction of the suspension bar 8a.
[0033]
The outer tank receiving seat 16 (16a, 16b, 16c, 16d) of the hanging rod 8 (8a, 8b, 8c, 8d) is an outer tank receiving part 22 (22a, 22b, 22c) protruding outward from the lower end of the outer tank 3. , 22d), and the four suspension rods 8 that are obliquely upward through the holes provided in the outer tank receiving portion 22 are connected to the corner receiving portions 23 (provided at the four corners of the upper end portion of the outer frame 1). Through the holes 23a, 23b, 23c, and 23d), an inverted conical surface formed at the lower portion of the outer frame receiving seat 17 (17a, 17b, 17c, and 17d) is supported by the corner receiving portion 23. Grease is applied to the contact surface between the outer frame receiving seat 17 and the corner receiving portion 23, and the outer frame receiving seat 17 vibrates in accordance with the position variation or vibration of the outer tub 3.
[0034]
For this reason, the rotational vibration of the dewatering tank 5 at the time of dehydration vibrates the outer tank 3, the outer tank receiving portion 22a, the outer tank receiving seat 16a, and the suspension rod 8a, and also vibrates the outer frame receiving seat 17a.
[0035]
As a result, the ring magnet 15 mounted on the outer frame receiving seat 17a also vibrates. This vibration changes the magnetic field near the coil 9 provided in the top cover 2. Therefore, a voltage proportional to the change in magnetic flux is induced at both ends of the coil 9 by electromagnetic induction. That is, the voltage generated in the coil 9 is due to the rotational vibration of the dewatering tank 5 held in the outer tank 3 by the clutch 4 and supported rotatably about the vertical shaft 4a. It has the frequency and amplitude information of the rotational vibration. If this voltage signal is processed, the rotational speed and rotational vibration amplitude of the dewatering tank 5 can be detected.
[0036]
An example of the voltage processing circuit 9a is shown in FIG. The output voltage of the coil 9 is amplified by an amplifier 30, noise is removed by a filter 31, input to a comparison circuit 32, compared with a predetermined threshold voltage, converted into a rectangular wave signal, and applied to a rotation output terminal 33. Is output. On the other hand, it is also input to the rectifier circuit 34, converted into an envelope signal by the smoothing circuit 35, and output to the amplitude output terminal 36.
[0037]
FIG. 5 shows signals from an output signal (a) in the amplifier 30 and an amplitude output (b) terminal 36 and a rotation output (c) terminal 33.
[0038]
The rotation output signal is a signal representing the rotational vibration period of the dewatering tank, and the rotation speed (number of rotations) of the dewatering tank can be obtained therefrom. The amplitude output signal is an envelope signal proportional to the vibration amplitude of the dewatering tank, and the vibration amplitude of the dewatering tank can be obtained therefrom.
[0039]
These signals are input to the microcomputer and used to control the operation of the washing machine.
[0040]
As described above, according to the present invention, the rotational vibration of the dewatering tank, that is, the rotational speed and the vibration amplitude can be detected simultaneously with a simple configuration including only the ring magnet 15, the coil 9, and the voltage processing circuit 9a. The coil 9 is not in contact with the vibrating ring magnet 15 and can be installed separately in the top cover 2. A control board 10 including a microcomputer is installed in the top cover 2. If the processing circuit 9a is mounted in the control board 10, the coil 9 and the control board 10 may be connected by a short line. Further, the distance between the coil 9 and the ring magnet 15 is not affected by the sinking of the outer tub due to the capacity of the laundry, and the vibration amplitude and the rotational speed detection are not affected by the amount of the laundry. The above has the effect of improving the reliability of the vibration rotation detecting means and reducing the mounting cost.
[0041]
FIG. 6 shows another embodiment of the rotational vibration detecting means. In this embodiment, the magnetic field of the ring magnet 15 is converged by a U-shaped iron core or ferrite core 40, and a change in magnetic flux due to vibration of the ring magnet 15 is efficiently detected by the coil 9 wound around the core. It is a thing. One cross-section A of the U-shape is located above a part a of the ring magnet 15, and the other cross-section B is located above a part b that is symmetrical with respect to the part a. For this reason, most of the magnetic flux from the portion a passes through the ferrite core and reaches the portion b. Therefore, compared with the embodiment of FIG. 3, the induced voltage of the coil 9 is large and the detection sensitivity can be improved.
[0042]
FIG. 7 shows another embodiment of the rotational vibration detecting means. The outer frame receiving seat 17a rotates on the corner receiving portion 23a plane around the suspension rod 8a by the rotational vibration of the dehydrating tank 3. Therefore, in the embodiment of FIG. 3, in order to prevent the magnetic field in the vicinity of the coil 9 from changing due to this rotation, the ring magnet 15 is provided centering on the axis of the suspension bar 8a. If the convex portion 71 is formed on a part of the inverted conical surface which is the lower surface of the outer frame receiving seat 17a, the slit 72 is provided on a part of the corner receiving portion 23a, and the previous convex portion is fitted to this, the above-mentioned Can be prevented. In this embodiment, the outer frame receiving seat 17a does not rotate, and an inexpensive bar magnet 41 is used in place of the previous ring magnet 15.
[0043]
FIG. 8 shows another embodiment of the rotational vibration detecting device. In the present embodiment, another coil 42 wound around the same ferrite core as the coil 9 is disposed in the top cover 2 and these coils are connected in series. The coil 9 is disposed above a part a of the ring magnet 15, and the coil 42 is disposed above a part b that is symmetrical to the part a. When the outer frame receiving seat 17 a slides due to the rotational vibration of the outer tub 3 and the part a of the ring magnet 15 approaches the coil 9, the part b moves away from the coil 41. Therefore, the phase of the voltage induced in the coil 9 and the voltage induced in the coil 42 are different by 180 degrees. The coils 9 and 42 are connected in series so as to add this antiphase induced voltage. According to this embodiment, the detection sensitivity can be doubled compared to the embodiment shown in FIG.
[0044]
FIG. 9 shows another embodiment of the rotational vibration detecting means. In this embodiment, a Hall element 43 or a magnetoresistive element 44 through which a constant current flows is provided instead of the coil 9 in the top cover 2 above the ring magnet 15. These elements are inserted into the notches of the iron core or ferrite core block 45. The iron core or ferrite core 45 efficiently converges the magnetic field of the ring magnet 15, places the inserted elements in a strong magnetic field, and draws out the Hall voltage and resistance changes generated by the magnetic flux change.
[0045]
FIGS. 10A and 10B show an example of an implementation circuit for extracting a voltage due to a change in magnetic flux from the Hall element 43 and the magnetoresistive element 44. A constant current is supplied to these elements by a constant current circuit using a transistor 46 to obtain a Hall voltage or a voltage due to resistance change. This voltage is processed by the voltage processing circuit 9a as in the case of the coil 9, and is input to the microcomputer as a rotation output and an amplitude output. It is also clear that detection sensitivity can be improved by arranging a plurality of Hall elements or magnetoresistive elements and adding output voltages of different phases as in the embodiment of FIG.
[0046]
FIG. 11 shows another embodiment of the rotational vibration detecting means. In this embodiment, a light reflecting plate 47 such as an aluminum foil is provided in a ring shape on the upper surface of the outer frame receiving seat 17a, and an infrared LED 48 and a phototransistor 49 are provided in the top cover 2 above this. Infrared light from the infrared LED 48 passes through the plastic on the bottom surface of the top cover 2 and is reflected by the light reflecting plate 47, and again passes through the plastic on the bottom surface of the top cover 2 and is received by the phototransistor 49.
[0047]
The outer frame receiving seat 17 vibrates due to the rotational vibration of the dewatering tank 3, and the light reflection plate 47 installed on the upper surface also vibrates. This vibration of the light reflection plate 47 causes the infrared light axis to vibrate and changes the amount of light incident on the phototransistor 49. Therefore, a voltage signal proportional to the rotational vibration as shown in FIG. 5 appears in the output of the phototransistor 49 as in the embodiment using the coil 9 described above.
[0048]
FIG. 12 shows an example of an implementation circuit for driving the infrared LED 48 and obtaining a voltage signal from the phototransistor 49. This voltage is processed by the voltage processing circuit 9a as in the case of the coil 9, and is input to the microcomputer as a rotation output and an amplitude output.
[0049]
Next, the operation of the washing machine having the vibration rotation detecting means of the present invention will be described.
[0050]
FIG. 13 is a block diagram of a washing machine control circuit configured around the microcomputer 50. In addition to the two outputs of the voltage processing circuit 9a, the microcomputer 50 is also connected to an operation button input circuit 51 and a water level sensor 52 to receive an input signal. In addition to the drive motor 7, the water supply valve 54 and the drain valve 55, it is also connected to notifying means such as the buzzer 12 and the display 13.
[0051]
FIG. 14 shows details of the drive motor 7 and the drive circuit 53. The drive motor 7 is a single phase induction motor. 7m is a main coil, 7a is an auxiliary coil, and 60 is a phase advance capacitor. The phase-advancing capacitor 60 causes a current flowing through the main coil 7m and the auxiliary coil 7b to have a phase difference of 90 degrees, thereby generating a rotating magnetic field and rotating the rotor. A commercial power supply 61 is energized by the bidirectional three-terminal thyristors F1 and F2, and is supplied to the auxiliary coil 7b via the main coil 7m and the phase advance capacitor 60. Then, a current having a phase difference caused by the phase advance capacitor 60 flows to the auxiliary coil 7a. As a result, a rotating magnetic field is generated by the auxiliary coil 7a and the main coil 7m, and the rotor rotates.
[0052]
During the washing process, the bi-directional three-terminal thyristors F1 and F2 are alternately turned on to rotate the rotor blades forward and backward. At the time of forward rotation, the bidirectional three-terminal thyristor F1 is turned on and F2 is turned off. On the contrary, at the time of reverse rotation, the bidirectional three-terminal thyristor F1 is made non-conductive and F2 is made conductive. In order to obtain the same torque by forward and reverse rotation, the main coil and the auxiliary coil are wound with almost the same line type. In other words, 7m is a main coil and 7a is an auxiliary coil during forward rotation, but the position is changed during reverse rotation so that 7a operates as a main coil and 7m operates as an auxiliary coil.
[0053]
During the dehydration step, the bidirectional three-terminal thyristor F1 is turned on and F2 is turned off. The gate terminals of the bidirectional three-terminal thyristors F1 and F2 are connected to the output port of the microcomputer 50 and controlled to be conductive / non-conductive.
[0054]
The zero cross detection circuit 62 detects a zero cross point of the commercial power supply 61, and includes a bidirectional photocoupler 63 and a resistor. The output of the zero cross detection circuit 62 is connected to the input terminal of the microcomputer 50. The microcomputer controls the conduction / non-conduction by controlling the gate terminal of each bidirectional three-terminal thyristor according to the detected zero cross point (timing). To do.
[0055]
The zero-cross detection circuit 62 is connected to the commercial power supply circuit and generates a rectangular pulse voltage synchronized with the voltage waveform cycle of the commercial power supply 61 to which the washing machine is connected. This rectangular pulse voltage becomes a power supply voltage zero cross signal that becomes a high level at the zero cross timing of the commercial power supply voltage. As shown in FIG. 15, the generation cycle of the two power supply voltage zero cross signals corresponds to one cycle of the commercial power supply voltage, and the generation cycle is 20 msec for the 50 Hz commercial power supply and 16.7 msec for the 60 Hz commercial power supply. The figure also shows the relationship between the bidirectional three-terminal thyristor trigger signal and the voltage applied to the drive motor 7. When triggering at the zero cross timing, the power supply voltage is applied as it is. This state is hereinafter referred to as full conduction. If the trigger is delayed by the phase angle θ1 from the zero cross timing, a part of the power supply voltage is applied as shown in the figure. The applied average voltage at this time is lower than that of the previous full conduction.
[0056]
A control operation (hereinafter referred to as Hertz-free control) in which the rotational vibration detecting means according to the present invention, the drive circuit and the drive motor of FIG. explain.
[0057]
Since the rotational speed of the single-phase induction motor that is the drive motor 7 is an induction motor, it increases to a rotational speed that substantially corresponds to the power supply frequency if there is no load. However, when the dehydration tank itself, the transmission mechanism and the laundry are rotated as a load, the above rotation speed cannot be obtained. FIG. 16 shows the rotational speed torque characteristics of the single-phase induction motor 7. In the figure, (a) shows a case where a commercial power source having a frequency of 50 Hz is applied, and (b) shows a case where a commercial power source having a frequency of 60 Hz is applied.
[0058]
When power is supplied, the dewatering tub and the laundry start rotating with a large output torque. Since the initial laundry contains a large amount of water, the load curve is in a standing state (indicated by L1 in the figure). As the number of rotations increases, moisture is removed from the laundry by the rotational centrifugal force and lightens, so the load curve gradually falls asleep (indicated by L2 in the figure). At the same time, the rotational speed gradually increases. In a state where a lot of moisture is removed and moisture in the fiber is difficult to remove by the rotational centrifugal force (indicated by L3 in the figure), the output torque and the load torque (dehydration tank and laundry weight) are balanced and almost constant. The dewatering tank rotates at the number of rotations.
[0059]
When the power supply frequency is 50 Hz, the rotational speed T is the operating point indicated by P3 in the figure, and when it is 60 Hz, the rotational speed T1 is indicated by P4. In this way, when the same single-phase induction motor is used at different frequencies, the final ultimate dewatering rotational speed is different.
[0060]
FIG. 16 (c) shows the rotational speed torque characteristic when a commercial power source with a phase controlled frequency of 60 Hz is applied. The fundamental frequency of the phase-controlled commercial power supply does not change, but the average voltage value changes with the phase angle. As the phase angle increases, the voltage value decreases and the static torque and the maximum torque also decrease as shown in the figure.
[0061]
FIG. 17 shows a flowchart of Hertz-free control. FIG. 18 shows the rotational speed control characteristics and the schematic control timing of the bidirectional three-terminal thyristor F1 when operating with a commercial power supply of 60 Hz according to the flowchart of FIG.
[0062]
First, in order to control the dehydration speed, the microcomputer 50 measures the frequency of the power supply voltage zero cross signal obtained from the zero cross detection circuit 62 at the start of dehydration to confirm the frequency of the commercial power supply to which the washing machine is connected ( Step S1). If the cycle is 10 msec, it is a 50 Hz commercial power supply, and if it is 8.3 msec, it is a 60 Hz commercial power supply. If it is connected to a commercial power supply of 60 Hz, a flag (DFLAG) that is 60 Hz, a target rotational speed T, and an activation flag (IFLAG) are set (step S2). In this embodiment, the target rotational speed is set to the rotational speed T obtained without control when operating with a commercial power supply of 50 Hz.
[0063]
Next, the bidirectional three-terminal thyristor F1 is brought into a fully conductive state with a phase angle of zero, and a dehydration process is started (step S3). The microcomputer 50 monitors the elapsed time of the dehydration process (step S4) and monitors the rotational speed of the dewatering tank 5 (step S5) detected by the rotational vibration detecting means comprising the coil 9 and the voltage processing circuit 9a for a predetermined time. For example, it is observed every second. If the power supply frequency is 50 Hz, the next constant rotational speed control is not performed (step S6).
[0064]
A constant rotation speed control routine will be described. When dehydration is started, the rotation of the dewatering tank 5 increases. The operating points P1, P2, and P3 in FIG. 16 shift and approach the target rotational speed T. In the case of 50 Hz, the motor stops at the operating point P4 where the output torque and the load torque are balanced, and the rotational speed at this time is T. In the case of 60 Hz, if the control is not performed, the rotational speed exceeds T and stops at the operating point P5, and the rotational speed at this time becomes T1. This T1 is approximately 1.2 times T.
[0065]
Therefore, in the case of 60 Hz, if the dehydration steady rotation speed 1000 rpm at the target frequency T, for example, the power frequency of 50 Hz, exceeds a predetermined value Δ, for example, 10 rpm to reach 1010 rpm (step S7), the rotation speed is decreased. First, the phase of the bidirectional three-terminal thyristor F1 is controlled by the phase angle θ1 (step S8). Then, the start flag is reset (step S9).
[0066]
The microcomputer 50 observes the zero cross timing signal of the commercial power supply from the zero cross detection circuit 62, and at the time corresponding to the phase angle θ1 from the time when the zero cross signal is detected, to the gate terminal of the bidirectional three-terminal thyristor F1. Send out a trigger signal to make it conductive. In this state, as shown in FIG. 16, the torque characteristic of the drive motor 7 decreases from (b) to (c). For this reason, the rotation speed of the dewatering tank does not decrease immediately due to inertial force, but gradually decreases. If this state is maintained, the rotational speed finally settles at a point indicated by P5 in FIG.
[0067]
During this time, the microcomputer 50 obtains the rotational speed information from the vibration / rotation detection circuit 62, and when the rotational speed becomes 990 rpm lower than the target value T = 1000 rpm by Δ, for example, 10 rpm (step S10), the activation flag is set. If not (step S11), a trigger signal is sent to the gate terminal of the bidirectional three-terminal thyristor F1 again when a phase angle of zero, that is, a zero cross is detected to make it all conductive (step S12).
[0068]
When the phase angle becomes zero in this way, the drive motor recovers the initial torque characteristic shown in FIG. 16B, and the rotational speed gradually increases again.
[0069]
If the target rotational speed is exceeded by a predetermined amount again (step S7), the above-described control is repeated. Thus, as shown in FIG. 18, the rotational speed of the dewatering tank 5 is controlled within a range of T ± Δ even when the power supply frequency is 60 Hz, and the rotational speed T at 50 Hz is maintained on average. .
[0070]
When the dehydration process has passed for a predetermined time (step S4), the dehydration end process is started, the bidirectional three-terminal thyristor F1 is disabled, that is, trigger signal transmission is stopped (step S13), the brake is applied (step S14), and the buzzer The user is informed of the end of dehydration (step S15).
[0071]
As described above, according to the present embodiment, the rotational speed of the dehydration tank can be controlled to a predetermined value regardless of the frequency of the commercial power source by using an existing inexpensive motor called a single-phase induction motor, which is used for frequency conversion. Part replacement is not necessary, and it is not necessary to make a distinction according to regional specifications, so that manufacturing costs can be reduced.
[0072]
Next, using the rotational vibration detecting means according to the present invention and the above-described variable speed motor control, when the vibration of the dehydration tank exceeds a predetermined level during the dehydration process, the dehydration process is stopped or the dehydration rotation speed is suppressed. An example of a control method for preventing abnormal vibration and reducing noise will be described.
[0073]
After the washing and rinsing process, the washing water is drained. As a result, the laundry settles on the bottom of the washing tub, but since the settled state is not uniform, an unbalance occurs for the rotation of the dewatering tub. This is called the occurrence of imbalance due to the cloth piece.
[0074]
As a result, the dehydration tank is abnormally vibrated at the initial or steady state of the dehydration, and if the vibration amplitude exceeds the limit, the outer tub 3 containing the washing / dehydration tub 5 comes into contact with the outer frame 1 to generate a loud noise or worse. If this happens, the washing machine will start walking alone and hit the wall, etc., causing damage.
[0075]
FIG. 19 shows the general relationship between the vibration amplitude of the outer tub and the rotational speed of the dewatering tub when the dehydration tub 5 in the outer tub 3 suspended by four suspension rods is rotationally driven. Show. Such a system has two resonance points. The lower one is called primary resonance and the higher one is called secondary resonance. In the initial stage of activation, that is, in a state where the rotation speed is low, the rotation increases while performing a parallel motion that slowly swings to the left and right as a rigid body, and the vibration amplitude reaches an extreme value at the primary resonance point. Thereafter, a conical motion is caused by an increase in the number of rotations, and the vibrations greatly vibrate up and down, and the vibration amplitude reaches a peak at the secondary resonance point. If it worsens at this time, an outer tank may contact an outer frame and may generate a big noise. When passing through the secondary resonance point, the vibration amplitude once decreases and settles to a constant value. However, when the number of rotations further increases, the system deviates from rigid body motion, and resonance due to the bending mode of each component constituting the system appears and the vibration amplitude increases. Turn to. The rotational speed finally rises to a point where the rotational driving torque and load torque of the single-phase induction motor are balanced, and remains there. Normally, this steady rotational speed is set below the resonance point due to the bending mode. As shown in the figure, the vibration amplitude increases as a whole if there is an unbalance due to the cloth piece.
[0076]
First, the control for detecting the abnormal vibration amplitude at the initial stage of the dehydration process by the rotational vibration detecting means and stopping the dehydration process will be described. First, the vibration amplitude is observed and measured by adding various equivalent cloth imbalances to the dehydration tank by experiments. At the same time, the vibration output of the rotational vibration detecting means is also measured. The vibration output value in a state where the outer tub is in contact with the outer frame is defined as Vmax. As described with reference to FIG. 19, there is the highest possibility of contact with the outer frame due to secondary resonance vibration. A value Vh that is lower than Vmax by a predetermined value is set. It is desirable to determine this value in consideration of variations during mass production.
[0077]
FIG. 20 shows a flowchart of abnormal vibration dehydration stop control. In order to simplify the explanation, only the processing at 50 Hz is described. That is, the hertz-free control process is omitted. First, in dehydration start-up, the bidirectional three-terminal thyristor F1 is fully conducted with a phase angle of zero (step S3), and commercial power is supplied to the single-phase induction motor 7. At the same time that the dewatering tank starts rotating, the microcomputer 50 outputs the rotation output (rotation output terminal 33) and the amplitude output (amplitude output terminal 36) of the rotation vibration detecting means comprising the coil 9 and the voltage processing circuit 9a, for example, 1 every fixed time. Reading is performed every second to obtain the rotation speed of the dewatering tank and the vibration amplitude of the outer tank (step S20). It is desirable that reading at regular intervals is performed by interrupt processing by a timer built in the microcomputer 50. It is monitored whether or not the vibration amplitude exceeds a predetermined amplitude value Vh (step S21), and if it exceeds, the process proceeds to dehydration stop processing. If not exceeded, the current state is maintained. That is, the state where the bidirectional three-terminal thyristor F1 is fully conducted, that is, the control state at the phase angle zero is maintained. As a result, the rotational speed finally increases to a rotational speed at which the rotational driving torque and load torque of the single-phase induction motor are balanced, and a rotational speed of, for example, 1000 rpm is maintained.
[0078]
When the vibration amplitude value exceeds Vh, in the dehydration stop process, the bidirectional three-terminal thyristor F1 is immediately turned off (step S22), power supply to the drive motor 7 is stopped, and a brake solenoid (not shown). Is fed to mechanically brake the rotation (step S23). Then, an alarm signal is sent to the buzzer to notify the user of the abnormality (step S24). Since the dehydration end process has been described above, a description thereof will be omitted.
[0079]
Conventionally, such abnormal vibration of the dehydration tank is performed by detecting contact of the outer tank with a micro switch with a lever fixed to the outer frame, and the rotation of the dehydration tank is stopped. This often causes a problem that the lever does not come into contact with the outer frame even if the outer tank comes into contact with the outer frame due to the installation position of the lever for detecting the contact with the outer tank. In this embodiment, since the vibration rotation detecting means is configured to monitor the vibration amplitude in all directions in principle, the above problem does not occur. Desirably, the reliability can be increased by combining the conventional micro switch with a lever and the present invention. In addition, it is desirable to use both as a double safety when one of them fails.
[0080]
FIG. 21 shows the relationship between the amplitude change rate in the secondary resonance and the maximum secondary resonance value. The amplitude change rate is an amplitude change per unit time when the secondary resonance is reached, and the time change rate increases as the secondary resonance value increases. That is, when the outer tub comes into contact with the outer frame, the secondary resonance amplitude suddenly rises, and the collision between the outer tub and the outer frame can be predicted in advance from the rising change rate, that is, the amplitude change rate.
[0081]
FIG. 22 shows a flowchart of the abnormal vibration dehydration stop control for preventing abnormal vibration using the above knowledge. As in FIG. 20, only 50 Hz processing is described for simplicity. First, in dehydration start-up, the bidirectional three-terminal thyristor F1 is fully conducted with a phase angle of zero (step S3), and commercial power is supplied to the single-phase induction motor 7. Simultaneously with the start of rotation of the dewatering tank, the microcomputer 50 reads the rotational output and amplitude output of the rotational vibration detecting means comprising the coil 9 and the voltage processing circuit 9a at regular intervals, for example, every second (step S20). Obtain the rotation speed and vibration amplitude of the aquarium. It is desirable that reading at regular intervals is performed by interrupt processing by a timer built in the microcomputer 50. When the rotation speed of the dewatering tank reaches the secondary resonance region (step S30), the amplitude change rate is calculated and stored (step S31), and it is monitored whether the amplitude change rate exceeds a predetermined value Vd. (Step S32), if it exceeds, the process proceeds to the dehydration stop process. If not exceeded, the current state is maintained. That is, the state in which the bidirectional three-terminal thyristor F1 is fully conducted, that is, the control state at the phase angle zero is maintained. As a result, the rotational driving torque of the single-phase induction motor 7 and the load torque are finally increased to a rotational speed that balances, and a rotational speed of, for example, 1000 rpm is maintained.
[0082]
The determination to reach the secondary resonance region (step S30) is performed based on the elapsed time monitoring or the rotational speed. This is because the torque characteristic of the drive motor 7, the laundry capacity (weight), the rotational vibration system characteristics including the outer tub, the dewatering tub, the clutch, the hanging rod, etc. can be used to know the time until the secondary resonance in advance and the rotational speed at that time. Because it can. Since the dehydration end and dehydration stop processing have been described above, they are omitted.
[0083]
Conventionally, as described above, the abnormal vibration of the outer tub (dehydration tub) is detected by a micro switch with a lever fixed to the outer frame to stop the rotation. The lever that detects the contact of the outer tub is installed closer to the outer frame than the outer tub, and when the outer tub touches the lever, the power supply to the drive motor is stopped and the brake is applied. In some cases, the outer tank and the outer frame collided. In this embodiment, since the maximum value of the abnormal vibration amplitude is predicted and the dehydration stop process is performed in advance, the outer tank can be prevented from colliding with the outer frame, and the above problem does not occur.
[0084]
Next, a silent dehydration control method for reducing the noise by suppressing the dehydration rotation speed when the dehydration tank vibration in the steady state exceeds a predetermined level will be described.
[0085]
FIG. 23 shows the relationship between the amount of upper unbalance generated due to the cloth slippage during steady rotation, the vibration amplitude and noise of the upper part of the outer tub. As the unbalance amount increases, the vibration amplitude increases, and at the same time the noise increases. FIG. 24 shows the relationship between the dewatering speed of the dewatering tank and the noise in the steady state. If there is an imbalance, the noise is loud and this noise is proportional to the rotational speed. This is because as the rotational speed increases, the excitation energy increases in proportion to the square of the rotational speed, and noise also increases in proportion thereto. Therefore, when the unbalance is small, the dehydrating tank is maintained at a constant rotation speed, for example, 1000 rpm during dehydration, but when the unbalance is large, the rotation speed is decreased to reduce noise.
[0086]
FIG. 25 shows the relationship between the amplitude output of the aforementioned rotational vibration detecting means and the upper unbalance amount during steady rotation. The amplitude output of the rotational vibration detecting means and the upper unbalance amount are substantially proportional.
[0087]
FIG. 26 shows a flowchart of the silent dehydration control. This is an embodiment when the dehydration process is continued without stopping the dehydration due to the abnormal vibration described above. For simplicity, the processing at 50 Hz is described.
[0088]
First, various equivalent cloth imbalances are added to the washing tub by experiment, and the vibration amplitude after the secondary resonance and the noise level at that time when the dehydration is not stopped due to abnormal vibration are observed and measured. At the same time, the vibration output of the rotational vibration detecting means is also measured. From this, Vs is set as the vibration output value at the allowable noise level.
[0089]
Next, the operation will be described according to the flowchart. First, at the start of dehydration, the vibration corresponding rotation speed control flag (CFLAG) is reset (step S40), the bidirectional three-terminal thyristor F1 is fully conducted with a phase angle of zero (step S3), and the single-phase induction motor 7 is supplied with commercial power. Supply. When the dewatering tank 5 starts to rotate, the microcomputer 50 monitors the rotational speed and vibration amplitude of the dewatering tank with the rotation output from the rotational vibration detecting device comprising the coil 9 and the voltage processing circuit 9a (step S20). When a predetermined time has elapsed after the rotation speed passes through the secondary resonance region without abnormal vibration (step S21) (step S41), it is monitored whether the vibration amplitude exceeds a predetermined amplitude value Vs. (Step S42). The elapse of the predetermined time (step S41) may be set when the rotation speed becomes equal to or higher than the predetermined value as described above (step S30). When the amplitude value Vs is exceeded, the process shifts to vibration corresponding rotation speed control. If not exceeded, CFLAG is checked (step S43), and if it is in the reset state, the current state is maintained. That is, the full conduction state of the bidirectional three-terminal thyristor F1 is maintained. As a result, the rotational speed finally increases to a rotational speed at which the rotational driving torque and load torque of the single-phase induction motor are balanced, and a rotational speed of, for example, 1000 rpm is maintained. At the vibration speed, the dehydration tank speed is controlled to decrease.
[0090]
FIG. 27 shows a flowchart of an embodiment of vibration corresponding rotational speed control. When the vibration amplitude exceeds a predetermined amplitude value Vs, the dehydration tank 5 is controlled to a predetermined rotation speed T2, for example, 760 rpm, and the same dehydration rotation speed as the 50 Hz power supply is obtained with the 60 Hz power supply described above. It is almost the same as control. If CFLAG is not set, it is determined that vibration-related rotation speed control has been entered first (step S44), and the target rotation speed is reset to T2 (step S46). And the dehydration process time mentioned later is also reset (step S47). If CFLAG is set, the above processing is passed.
[0091]
If the rotation speed is a value higher than the target rotation speed T2 by Δ, for example, 20 rpm (step S48), the bidirectional three-terminal thyristor F1 is shifted to conduction at the phase angle θ1 (step S49). As a result, the output torque decreases and the rotational speed gradually decreases. When the rotational speed has decreased by Δ from T2 (step S50), the bidirectional three-terminal thyristor F1 is again fully conducted with a phase angle of zero (step S51). As a result, the output torque increases and the rotation of the dewatering tank 5 gradually increases again.
[0092]
By continuing the above operation, when the vibration amplitude once exceeds Vs, the rotational speed is maintained at substantially the target value T2.
[0093]
FIG. 28 shows the relationship between the spin speed and the laundry dehydration rate. The higher the rotation speed, the better the dehydration rate. At 1000 rpm, it becomes 68% in 8 minutes. However, it takes 14 minutes to reach 68% at 760 rpm. That is, when the dehydration rotational speed is lowered, it is necessary to increase the dehydration time. Therefore, when the vibration corresponding rotational speed control is performed, the dehydration end time is extended. This is performed by resetting and setting the predetermined dehydration time at the time of entering the vibration corresponding rotational speed control (step S47).
[0094]
FIG. 29 shows another embodiment of the vibration corresponding rotational speed control routine. In this case, when the vibration amplitude exceeds a predetermined amplitude value Vs, the rotation speed T3 read immediately before is set as the target dehydration rotation speed in the vibration corresponding control. For example, when T3 = 900 rpm and the amplitude value exceeds Vs, the rotation speed is reset as a target value (step S52), and the vibration-corresponding rotation speed control is performed. Since the resetting of the dewatering time depends on the rotation speed as shown in FIG. 28, the relationship between the rotation speed and the necessary dewatering time is stored in advance as a table, and the table is drawn according to the set rotation speed (step S53). ) To reset the dehydration time (step S54). The rest is the same as in the embodiment of FIG.
[0095]
As described above, according to the present embodiment, when the noise increases due to the cloth piece, the washing machine performs the quiet dehydration process operation while maintaining the same dehydration performance as before in order to reduce the dehydration speed and extend the dehydration time. Can provide.
[0096]
The above embodiment according to the present invention has the following effects.
[0097]
In the washing machine, it is possible to provide means capable of simultaneously detecting the rotational vibration of the dewatering tank, that is, the rotational speed and the vibration amplitude, with a simple configuration including only the magnet, the coil, and the voltage processing circuit. Further, the coil of the component and the vibrating ring magnet are in a non-contact state, and the coil can be installed separately in the top cover. A control board including a microcomputer is installed in the top cover. If a voltage processing circuit is mounted on the top cover, the coil and the control board may be connected by a short line. The above has the effect of improving the reliability of the vibration rotation detecting means and lowering the mounting cost in the washing machine.
[0098]
Further, by using the above-described rotational vibration detecting means, the rotational speed of the dewatering tank is controlled to a predetermined value regardless of the frequency of the commercial power source by using an existing inexpensive motor called a single-phase induction motor in a washing machine. This eliminates the need for replacement of components associated with frequency conversion and eliminates the need for distinction according to regional specifications, thereby reducing manufacturing costs.
[0099]
In addition, when the dehydration is stopped due to abnormal vibration of the washing machine, the vibration rotation detecting means is configured to monitor the vibration amplitude in all directions in principle, so that it is like a conventional micro switch with a lever fixed to the outer frame. Even if the outer tub comes into contact with the outer frame depending on the installation position of the lever, there is no problem that the lever does not contact and the dehydration cannot be stopped, and a washing machine having a certain safety can be provided. Furthermore, the collision between the outer tank and the outer frame can be predicted in advance from the amplitude change rate of the vibration rotation detecting means, and if this is used to stop dehydration due to abnormal vibration, the outer tank can be prevented from colliding with the outer frame. .
[0100]
In addition, when the noise increases due to the cloth piece, the drive motor is controlled based on the vibration amplitude of the vibration rotation detecting means to reduce the dewatering rotation speed and extend the dewatering time. A washing machine that performs a quiet dehydration process operation can be provided.
[0101]
Among the means for detecting the vibration amplitude and / or rotation speed of the dehydration tank, especially if a circuit to which voltage is applied or wiring through which current flows are collected in the top cover, shielding from electromagnetic noise and waterproofing are performed. It becomes easy and can improve reliability. Further, when assembling, only a top cover is attached to the main body, and wiring or the like is not required. In addition, the sensor can be separated from the main body together with the control circuit by simply removing the top cover at the time of disassembly, so that the work efficiency of disassembly and assembly can be improved, and the effect of facilitating disassembly and collection by material at the time of disassembly can be expected .
[0102]
【The invention's effect】
  According to the present invention, means for detecting the rotational speed (number of rotations) of the dewatering tub / washing tub andShakeBy providing the means for detecting the dynamic amplitude at the upper end of the suspension bar, the assembly work efficiency of the washing machine can be improved.
By providing the ring magnet in the magnetic field generating means, it is possible to prevent the magnetic field in the vicinity of the magnetic flux change detecting means from changing even when the suspension rod is rotated by the vibration of the dehydrating tank.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a fully automatic washing machine according to the present invention.
FIG. 2 is a plan view of a fully automatic washing machine according to the present invention.
FIG. 3 is a detailed view of a hanging rod provided with rotational vibration detecting means.
FIG. 4 is a voltage processing circuit of rotational vibration detection means.
FIG. 5 is a diagram illustrating an output signal of a rotational vibration detecting unit.
FIG. 6 shows another embodiment of the rotational vibration detecting means.
FIG. 7 shows another embodiment of the rotational vibration detecting means.
FIG. 8 shows another embodiment of the rotational vibration detecting means.
FIG. 9 shows another embodiment of the rotational vibration detecting means.
FIG. 10 shows a Hall element and magnetoresistive element circuit.
FIG. 11 shows another embodiment of the rotational vibration detecting means.
FIG. 12 shows an infrared LED and a phototransistor circuit.
FIG. 13 is a block diagram of a washing machine control circuit.
FIG. 14 is a drive motor control circuit.
FIG. 15 is a phase control based on a power supply voltage waveform and a zero cross.
FIG. 16 shows torque rotation speed characteristics of the drive motor.
FIG. 17 is a flowchart of Hertz-free control.
FIG. 18 is a diagram showing rotation speed control characteristics and bidirectional three-terminal thyristor control timing.
FIG. 19 is a diagram showing the relationship between the vibration amplitude of the outer tub and the rotation speed of the dewatering tub.
FIG. 20 is a diagram showing an abnormal vibration dehydration stop control flowchart.
FIG. 21 is a diagram illustrating a relationship between an amplitude change rate in a secondary resonance and a maximum secondary resonance value.
FIG. 22 is a diagram showing a flowchart of abnormal vibration dehydration stop control.
FIG. 23 is a diagram illustrating a relationship between an upper unbalance amount, vibration amplitude, and noise.
FIG. 24 is a diagram showing the relationship between the spin speed and noise.
FIG. 25 is a diagram showing the relationship between the rotational vibration detection means amplitude output and the upper unbalance amount.
FIG. 26 is a flowchart of silent dehydration control.
FIG. 27 is a diagram showing a flowchart of vibration-responsive rotation speed control.
FIG. 28 is a diagram showing the relationship between the spin speed and the spin rate.
FIG. 29 is a diagram showing a flowchart of vibration-responsive rotation speed control.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Outer frame, 2 ... Top cover, 3 ... Outer tub, 5 ... Washing and dewatering tub, 7 ... Drive motor, 8a ... Hanging rod, 9 ... Coil, 9a ... Voltage processing circuit, 10 ... Control board, 15 ... Ring Magnet, 16a ... outer tank receiving seat, 17a ... outer frame receiving seat, 18a ... lower spring receiving seat, 19a ... upper spring receiving seat, 20a ... vibration absorber, 21a ... rubber plate, 22a ... outer tank receiving portion, 23a DESCRIPTION OF SYMBOLS ... Corner receiving part, 30 ... Amplifier, 31 ... Filter, 32 ... Comparison circuit, 33 ... Rotation output terminal, 34 ... Rectification circuit, 35 ... Smoothing circuit, 36 ... Amplitude output terminal, 40 ... Ferrite core, 41 ... Bar magnet, 42 ... Coil, 43 ... Hall element, 44 ... Magnetoresistive element, 45 ... Ferrite core block, 46 ... Transistor, 47 ... Light reflector, 48 ... Infrared LED, 49 ... Phototransistor, 50 ... Microcomputer, 6 ... phase advancing capacitor, 61 ... utility power, 62 ... zero cross detection circuit, 63 ... bidirectional photocoupler, F1 ... bidirectional triode thyristor.

Claims (5)

An outer frame, an outer tub supported via a plurality of suspension rods to the outer frame, before Symbol outer tub in a rotatably supported dewatering tank and the washing tank and the washing machine having a
A magnetic field generation means fixed to the suspension rod side at the upper end of the suspension bar, and a magnetic flux change detection means disposed relative to the magnetic field generation means,
The magnetic field generating means comprises a ring magnet whose center is substantially coincident with the axis of the suspension rod,
A detection for times Utateken detecting means the rotational speed and rotational vibration amplitude of the dewatering tank and the washing tub from the output of the magnetic flux change detecting means,
The times Utateken out based on the output of the unit, washing machine and controlling the rotation of the dewatering tank and the washing tub. 2. The washing machine according to claim 1, wherein an amplifier that amplifies the output of the magnetic flux change detection means, a filter that removes noise from the signal amplified by the amplifier, and a signal from which noise has been removed by the filter are predetermined. A comparison circuit for comparing with a threshold value, a rectification circuit for rectifying the signal from which noise has been removed by the filter, and a smoothing circuit for converting the signal rectified by the rectification circuit into an envelope signal, from the output of the comparison circuit A washing machine characterized by detecting a rotational speed of a dewatering tub / washing tub and detecting a rotational vibration amplitude of the dewatering tub / washing tub from an output of the smoothing circuit.   2. The washing machine according to claim 1, further comprising a top cover installed on top of the outer frame, wherein the magnetic flux change detecting means is disposed on the top cover. In the washing machine according to claim 1, wherein the dewatering tank and the washing tub when the rate of change of the rotational vibration amplitudes exceeds a predetermined value, a washing machine, characterized in that it is controlled to stop rotating. 2. The washing machine according to claim 1 , wherein the dewatering tub / washing tub is controlled to decrease the rotation speed when the rotational vibration amplitude during steady rotation during dehydration is greater than a predetermined value. Washing machine.

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