JP2008099979A - Washing machine - Google Patents

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JP2008099979A
JP2008099979A JP2006286663A JP2006286663A JP2008099979A JP 2008099979 A JP2008099979 A JP 2008099979A JP 2006286663 A JP2006286663 A JP 2006286663A JP 2006286663 A JP2006286663 A JP 2006286663A JP 2008099979 A JP2008099979 A JP 2008099979A
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drum
rotation
washing machine
rotation speed
drive motor
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JP4656660B2 (en
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Sugimatsu Hasegawa
杉松 長谷川
Shinji Kondo
信二 近藤
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a washing machine provided with a bulk-of-fabric sensing means capable of accurately sensing the bulk of fabrics inside a rotary drum with simple constitution by restraining an influence resulting from an uneven frictional resistance to a drum rotating axis. <P>SOLUTION: The washing machine is provided with the rotary drum for housing a wash, a water tank including the drum and elastically supported inside a washing-machine main body, a drum driving motor 7 for rotating the drum, a rotary-speed sensing device 33 for sensing a rotary speed of the motor 7 and a control part 31 for controlling rotations of the motor 7 from an output sensed by the sensing device 33. For sensing the bulk of the fabrics, the control part 31 accelerates the rotations of the drum with a specified torque by the motor 7 to measure an accelerative time T required from a rotary speed A up to a rotary speed B; the control part 31 stops the motor 7 from rotating the drum to make it rotate through its inertia to measure a decelerative time t required from a rotary speed C to a rotary speed D. The bulk of the fabrics is sensed from the accelerative time T and the decelerative time t. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、回転ドラムに投入された洗濯物の量である布量を検知するための布量センサを有する洗濯機に関する。   The present invention relates to a washing machine having a cloth amount sensor for detecting a cloth amount that is an amount of laundry put in a rotating drum.

ドラム式洗濯機の構造の一例を図５に示す。この洗濯機本体１内には、図示しないサスペンション構造によって水槽２が宙吊り状態に支持されている。水槽２内には、有底円筒形に形成された回転ドラム３が、その軸心方向を正面側から背面側に向けて下向きに傾斜させて支持されている。水槽２の正面側には回転ドラム３の開口端に通じる衣類出入口４が形成され、洗濯機本体１の正面側の上向き傾斜面に設けられた開口部を開閉可能に閉じる扉５を開くことにより、衣類出入口４を通じて回転ドラム３内に対して洗濯物を出し入れすることができる。   An example of the structure of the drum type washing machine is shown in FIG. In the washing machine body 1, a water tank 2 is supported in a suspended state by a suspension structure (not shown). A rotating drum 3 formed in a bottomed cylindrical shape is supported in the water tank 2 with its axial direction inclined downward from the front side to the back side. On the front side of the aquarium 2 is formed a clothing doorway 4 leading to the opening end of the rotary drum 3, and by opening the door 5 that closes the opening provided in the upward inclined surface on the front side of the washing machine body 1 so that it can be opened and closed. The laundry can be taken in and out of the rotary drum 3 through the clothing entrance 4.

回転ドラム３には、その周面に水槽２内に通じる多数の透孔６が形成され、内周面の複数位置に攪拌突起（図示せず）が設けられている。この回転ドラム３は、水槽２の背面側に取り付けられたドラム駆動モータ７によって正転及び逆転方向に回転駆動される。また、水槽２には、注水管路８及び排水管路９が配管接続され、図示しない注水弁及び排水弁の制御によって水槽２内への注水及び排水がなされる。   The rotating drum 3 is formed with a large number of through holes 6 communicating with the inside of the water tank 2 on its peripheral surface, and provided with stirring protrusions (not shown) at a plurality of positions on the inner peripheral surface. The rotary drum 3 is rotationally driven in the forward and reverse directions by a drum drive motor 7 attached to the back side of the water tank 2. In addition, a water injection pipe 8 and a drain pipe 9 are connected to the water tank 2 to perform water injection and drainage into the water tank 2 by controlling a water injection valve and a water discharge valve (not shown).

扉５を開き回転ドラム３内に洗濯物及び洗剤を投入して、洗濯機本体１の例えば前面上部に設けられた操作パネル１０での操作により運転を開始させると、水槽２内には注水管路８から所定量の注水がなされ、ドラム駆動モータ７により回転ドラム３が回転駆動されて洗濯工程が開始される。回転ドラム３の回転により、回転ドラム３内に収容された洗濯物は回転ドラム３の内周壁に設けられた攪拌突起によって回転方向に持ち上げられ、持ち上げられた適当な高さ位置から落下する攪拌動作が繰り返されるので、洗濯物には叩き洗いの作用が及んで洗濯がなされる。所要の洗濯時間の後、汚れた洗濯液は排水管路９から排出され、回転ドラム３を高速回転させる脱水動作により洗濯物に含まれた洗濯液を脱水し、その後、水槽２内に注水管路８から注水してすすぎ工程が実施される。このすすぎ工程においても回転ドラム３内に収容された洗濯物は回転ドラム３の回転により攪拌突起により持ち上げられて落下する攪拌動作が繰り返されてすすぎ洗いが実施される。   When the door 5 is opened, laundry and detergent are put into the rotating drum 3 and the operation is started by an operation on the operation panel 10 provided on the front surface of the washing machine body 1, for example, a water injection pipe is placed in the water tank 2. A predetermined amount of water is injected from the passage 8 and the drum 3 is rotated by the drum drive motor 7 to start the washing process. By the rotation of the rotating drum 3, the laundry accommodated in the rotating drum 3 is lifted in the rotating direction by the stirring protrusion provided on the inner peripheral wall of the rotating drum 3, and the stirring operation of dropping from the lifted appropriate height position Is repeated, so that the laundry has the effect of tapping and washing. After the required washing time, the dirty washing liquid is discharged from the drain pipe 9 and the washing liquid contained in the laundry is dehydrated by a dehydrating operation of rotating the rotary drum 3 at a high speed. Rinsing is performed by pouring water from the path 8. Also in this rinsing step, the laundry stored in the rotating drum 3 is rinsed by repeating the stirring operation in which the laundry is lifted and dropped by the stirring protrusion by the rotation of the rotating drum 3.

このドラム式洗濯機には、回転ドラム３内に収容した洗濯物を乾燥する機能が設けられ、循環送風経路１１により、水槽２内の空気を排気して除湿し、加熱して乾燥させた空気を再び水槽２内に送風する。この循環送風経路１１の途中には蒸発器などの除湿手段、凝縮器などの加熱手段及び送風手段である送風ファン１２が設けられている。この循環送風経路１１を利用した乾燥工程では、循環送風経路１１を循環される空気中に主として衣類などの洗濯物から発生する糸くずなどの異物が混じって循環し、蒸発器や凝縮器の目詰まり、送風ファン１２の回転部への噛み込み、送風ファン１２の内面への堆積といった乾燥工程を実施するのに支障を来し易いので、循環送風経路１１の途中に、循環空気中の異物を除去するフィルタ１３が設けられている。また、ドラム駆動モータ７の回転を検知するための回転検知部１４が設けられている。   This drum type washing machine is provided with a function of drying laundry stored in the rotary drum 3, and the air in the water tank 2 is exhausted and dehumidified by the circulation air passage 11 to be heated and dried. Is again blown into the water tank 2. In the middle of the circulation air passage 11, a dehumidifying means such as an evaporator, a heating means such as a condenser, and a blower fan 12 serving as an air blowing means are provided. In the drying process using the circulation air passage 11, foreign matter such as lint generated from laundry such as clothes is circulated in the air circulated through the circulation air passage 11, and the eyes of the evaporator and the condenser are circulated. Since clogging, biting into the rotating part of the blower fan 12 and deposition on the inner surface of the blower fan 12 are likely to be hindered, foreign substances in the circulating air are trapped in the middle of the circulation blower path 11. A filter 13 to be removed is provided. Further, a rotation detection unit 14 for detecting the rotation of the drum drive motor 7 is provided.

以上のような構成のドラム式洗濯機においては、回転ドラム３に投入された衣類等洗濯物の布量を検出し、布量に応じて洗濯時間等を決定している。特許文献１に開示された、布量を検出する方法の一例について、図６を参照して、以下に説明する。   In the drum type washing machine having the above-described configuration, the amount of laundry such as clothes put into the rotary drum 3 is detected, and the washing time and the like are determined according to the amount of laundry. An example of a method for detecting the amount of cloth disclosed in Patent Document 1 will be described below with reference to FIG.

布量の検出は、回転ドラム３を回転駆動するためのドラム駆動モータ７を制御する機能を有する制御回路（図示せず）により行われる。   The cloth amount is detected by a control circuit (not shown) having a function of controlling a drum drive motor 7 for driving the rotary drum 3 to rotate.

洗濯を開始すると、まず、制御回路は、ドラム駆動モータ７を始動し、回転検知部１４からは検知出力が入力される。回転検知部１４の検出周波数は、ドラム駆動モータ７の回転によりリニアに変化する。制御回路は、回転検知部１４からの入力周波数が小さいときは、位相制御の手段によりドラム駆動モータ７の電源電圧の平均電圧を大きくし、また、周波数が大きくなると平均電圧を小さくする。   When washing is started, first, the control circuit starts the drum drive motor 7, and a detection output is input from the rotation detection unit 14. The detection frequency of the rotation detector 14 changes linearly with the rotation of the drum drive motor 7. The control circuit increases the average voltage of the power supply voltage of the drum drive motor 7 by means of phase control when the input frequency from the rotation detector 14 is small, and decreases the average voltage when the frequency increases.

布量検知工程では、回転制御を行ないながら、制御回路内部で徐々にドラム駆動モータ７に印加する平均電圧を上昇させて高速回転に移行し、衣類が回転ドラム３の内壁に遠心力により均一に貼り付くようにする。その状態で、所定時間回転を持続した後、ドラム駆動モータ７の通電を停止する。それにより、回転ドラム３の惰性回転が、逆にドラム駆動モータ７を回転させる状態になる。   In the cloth amount detection process, while performing rotation control, the average voltage applied to the drum drive motor 7 is gradually increased inside the control circuit to shift to high speed rotation, and the clothing is uniformly applied to the inner wall of the rotary drum 3 by centrifugal force. Make it stick. In this state, the rotation of the drum drive motor 7 is stopped after continuing the rotation for a predetermined time. Thereby, the inertial rotation of the rotary drum 3 is in a state of rotating the drum drive motor 7 in reverse.

このとき回転検知部１４は、図６に示すように、回転ドラム３の惰性回転力が機械損によりしだいに低下して停止する様子を分回転数に変換して出力する。図６における横軸は時間、縦軸は駆動電動機（ドラム駆動モータ）の分回転数を示す。通電停止から回転ドラム３の停止までの時間は、布量が多いときは長く、布量が少ないときは短い。この停止に要する時間の違いが布量に比例することを利用して布量を検知する。   At this time, as shown in FIG. 6, the rotation detection unit 14 converts the inertial rotational force of the rotary drum 3 to gradually decrease due to a mechanical loss and stops and converts it into a minute rotational speed and outputs it. In FIG. 6, the horizontal axis represents time, and the vertical axis represents the number of rotations of the drive motor (drum drive motor). The time from the stop of energization to the stop of the rotary drum 3 is long when the amount of cloth is large, and short when the amount of cloth is small. The cloth amount is detected by utilizing the fact that the difference in time required for the stop is proportional to the cloth amount.

すなわち、布にかかる遠心力Ｆは、単位体積当たりの布の重量をｍ、回転ドラム３の半径をｒ、回転角速度をωとすると、次式で求められる。   That is, the centrifugal force F applied to the cloth can be obtained by the following equation, where m is the weight of the cloth per unit volume, r is the radius of the rotating drum 3, and ω is the rotational angular velocity.

Ｆ＝ｍｒω2
分回転数が一定であれば、回転角速度ωおよび回転ドラムの半径ｒが一定なので、布の遠心力Ｆは、重量ｍに比例する。 F = mrω 2
If the number of revolutions per minute is constant, the rotational angular velocity ω and the radius r of the rotating drum are constant, so that the cloth centrifugal force F is proportional to the weight m.

ドラム駆動モータ７の通電を停止したとき、遠心力Ｆは、回転ドラム３の初期惰性回転力となる。従って、回転ドラム３が停止するまでの時間は遠心力Ｆに、すなわち、布量に比例する。
特開平５−１６８７８６号公報 When the energization of the drum drive motor 7 is stopped, the centrifugal force F becomes the initial inertial rotational force of the rotating drum 3. Accordingly, the time until the rotating drum 3 stops is proportional to the centrifugal force F, that is, the cloth amount.
JP-A-5-168786

上記従来の布量検知方法を用いる場合には、回転ドラムの惰性回転力が機械損によりしだいに低下して、回転ドラムが停止するまでの時間と布量の比例関係を、予め実験により求めておくことになる。そして求めた測定値を、同一機種の全ての洗濯機に適用することになる。しかしながら、ドラム回転軸の摩擦抵抗のバラツキの影響により、回転ドラムが停止するまでの時間と布量の比例関係は一定ではなく、洗濯機によって相違する。そのため、上記従来の布量検知方法の検知精度には限界があった。   When the conventional cloth amount detection method is used, a proportional relationship between the amount of time until the rotary drum stops and the inertial rotational force of the rotating drum gradually decreases due to mechanical loss and the amount of cloth is experimentally determined. I will leave. The obtained measurement value is applied to all washing machines of the same model. However, due to the effect of variations in the frictional resistance of the drum rotating shaft, the proportional relationship between the time until the rotating drum stops and the amount of cloth is not constant and varies depending on the washing machine. Therefore, the detection accuracy of the conventional cloth amount detection method has a limit.

従って本発明は、回転ドラムに投入された布量を、ドラム回転軸の摩擦抵抗のバラツキの影響を抑制して、簡単な構成で精度よく検知可能な布量検知手段を有する洗濯機を提供することを目的とする。   Therefore, the present invention provides a washing machine having a cloth amount detecting means capable of accurately detecting a cloth amount put into a rotary drum with a simple configuration while suppressing the influence of variation in frictional resistance of the drum rotation shaft. For the purpose.

上記課題を解決するために、本発明の洗濯機は、水平方向または傾斜方向に回転中心軸を有し、洗濯物を収容する回転ドラムと、前記回転ドラムを回転自在に内包し洗濯機本体内に弾性的に支持された水槽と、前記ドラムを回転駆動するドラム駆動モータと、前記ドラム駆動モータの回転速度を検知する回転速度検知装置と、前記回転速度検知装置の検知出力に基づき前記ドラム駆動モータの回転を制御する制御部とを備え、前記制御部は、前記布量を検知するために、前記ドラム駆動モータにより所定のトルクで前記回転ドラムの回転を加速して、回転速度Ａから回転速度Ｂに到達するまでの上昇時間Ｔを測定し、かつ前記ドラム駆動モータによる駆動を停止して前記回転ドラムを惰性回転させたときに、回転速度Ｃから回転速度Ｄに到達するまでの降下時間ｔを測定し、前記上昇時間Ｔと前記降下時間ｔに基づき、前記布量を検知する。   In order to solve the above-described problems, a washing machine of the present invention has a rotation center shaft in a horizontal direction or an inclination direction, and includes a rotation drum that accommodates laundry, and the rotation drum that rotatably includes the rotation drum. A drum that is elastically supported on the drum, a drum drive motor that rotationally drives the drum, a rotational speed detector that detects the rotational speed of the drum drive motor, and the drum drive based on the detection output of the rotational speed detector A control unit that controls the rotation of the motor, and the control unit accelerates the rotation of the rotating drum with a predetermined torque by the drum drive motor to detect the cloth amount, and rotates from the rotation speed A. When the rising time T until reaching the speed B is measured, and the driving by the drum drive motor is stopped and the rotating drum is rotated by inertia, the rotation speed C reaches the rotation speed D. Measuring the fall time t until the, on the basis of said rise time T the fall time t, for detecting the laundry weight.

上記構成の洗濯機によれば、回転ドラムの回転の上昇および降下の速度の双方を用いて布量を測定するため、ドラム回転軸の摩擦抵抗のバラツキが相殺され、そのバラツキの影響を抑制することが可能であり、簡単な構成で精度よく布量を検知することができる。   According to the washing machine having the above-described configuration, the cloth amount is measured using both the rotation speed of the rotating drum and the speed of lowering, so that the variation in the frictional resistance of the drum rotation shaft is offset and the influence of the variation is suppressed. It is possible to accurately detect the amount of cloth with a simple configuration.

上記構成の本発明の洗濯機において、前記回転制御部は、前記布量を検知する工程で前記回転ドラムの回転を加速している途中における、所定回転角区間における前記回転ドラムの最大回転速度と最小回転速度を計測し、最大回転速度と最小回転速度の差が所定値以上である場合は、前記回転ドラムの回転駆動を停止する構成とすることが好ましい。   In the washing machine of the present invention configured as described above, the rotation control unit is configured to detect a maximum rotation speed of the rotating drum in a predetermined rotation angle section during acceleration of rotation of the rotating drum in the step of detecting the cloth amount. It is preferable that the minimum rotational speed is measured, and the rotational driving of the rotary drum is stopped when the difference between the maximum rotational speed and the minimum rotational speed is a predetermined value or more.

以下、本発明の実施形態について図面を参照しながら説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施の形態１）
本発明の実施の形態１におけるドラム式洗濯機の概略構造は、図５に示した従来例のものと同様である。本実施の形態におけるドラム式洗濯機の動作を制御する制御装置は、図１に示すような概略構成を有する。 (Embodiment 1)
The schematic structure of the drum type washing machine in Embodiment 1 of the present invention is the same as that of the conventional example shown in FIG. The control device for controlling the operation of the drum type washing machine in the present embodiment has a schematic configuration as shown in FIG.

図１に示す制御装置においては、商用電源２０の交流電力を整流器２１より整流し、チョークコイル２２及び平滑コンデンサ２３からなる平滑回路により平滑化された直流電力を駆動電力として、インバータ回路２４によりドラム駆動モータ７を回転駆動する。また、入力設定部２５から入力される運転指示、及び各検知手段（図示せず）により検知される運転状態の監視情報に基づいてドラム駆動モータ７の回転を制御し、負荷駆動部２６により給水弁２７、排水弁２８、送風ファン１２、ヒータ２９の動作を制御する。   In the control device shown in FIG. 1, the AC power of the commercial power supply 20 is rectified by a rectifier 21, and the DC power smoothed by a smoothing circuit including a choke coil 22 and a smoothing capacitor 23 is used as driving power, and a drum is driven by an inverter circuit 24. The drive motor 7 is rotationally driven. Further, the rotation of the drum drive motor 7 is controlled based on the operation instruction input from the input setting unit 25 and the monitoring information of the operation state detected by each detection means (not shown), and the load drive unit 26 supplies water. The operation of the valve 27, the drain valve 28, the blower fan 12, and the heater 29 is controlled.

ドラム駆動モータ７は、３相巻線７ａ、７ｂ、７ｃを有するステータと、２極の永久磁石を有するロータとを備え、３つの位置検出素子３０ａ、３０ｂ、３０ｃを設けた直流ブラシレスモータとして構成され、スイッチング素子２４ａ〜２４ｆにより構成されたＰＷＭ制御インバータ回路２４により回転制御される。位置検出素子３０ａ、３０ｂ、３０ｃが検出するロータ位置検出信号は、マイコンにより構成された制御部３１に入力される。このロータ位置検出信号に基づいて、駆動回路３２によりスイッチング素子２４ａ〜２４ｆのオン／オフ状態をＰＷＭ制御することにより、ステータの３相巻線７ａ、７ｂ、７ｃに対する通電を制御してロータを所要回転数で回転させる。   The drum drive motor 7 includes a stator having three-phase windings 7a, 7b, and 7c and a rotor having a two-pole permanent magnet, and is configured as a DC brushless motor provided with three position detection elements 30a, 30b, and 30c. Then, the rotation is controlled by the PWM control inverter circuit 24 constituted by the switching elements 24a to 24f. The rotor position detection signals detected by the position detection elements 30a, 30b, and 30c are input to the control unit 31 configured by a microcomputer. Based on this rotor position detection signal, the drive circuit 32 performs PWM control of the on / off states of the switching elements 24a to 24f, thereby controlling the energization of the three-phase windings 7a, 7b, and 7c of the stator, thereby requiring the rotor. Rotate at the number of revolutions.

制御部３１は、３つの位置検出素子３０ａ、３０ｂ、３０ｃの検出出力が入力される回転速度検知部３３を有する。回転速度検知部３３は、３つの位置検出素子３０ａ、３０ｂ、３０ｃのいずれかの信号の状態が変わるたびにその周期を検出し、その周期よりロータの回転速度を算出する。回転速度検知部３３の検知出力は布量検知部３４に供給され、検出された回転速度に基づき、以下に説明するように布量が検知される。なお、回転速度検知部３３の検知出力は回転ドラム３の回転速度に対応するので、以下の説明において回転ドラム３の回転速度は、回転速度検知部３３の検知出力により得られるものである。   The control unit 31 includes a rotation speed detection unit 33 to which detection outputs of the three position detection elements 30a, 30b, and 30c are input. The rotation speed detection unit 33 detects the period each time the signal state of any of the three position detection elements 30a, 30b, and 30c changes, and calculates the rotation speed of the rotor from the period. The detection output of the rotation speed detection unit 33 is supplied to the cloth amount detection unit 34, and the cloth amount is detected based on the detected rotation speed as described below. Since the detection output of the rotation speed detection unit 33 corresponds to the rotation speed of the rotation drum 3, the rotation speed of the rotation drum 3 is obtained from the detection output of the rotation speed detection unit 33 in the following description.

本実施の形態における布量検知方法の特徴について、図２を参照して説明する。図２（ａ）は、ドラム回転軸の摩擦抵抗と、回転ドラム３の回転速度上昇に要する時間、および惰性回転による回転速度降下に要する時間との関係を示す。横軸はドラム回転軸の摩擦抵抗、縦軸は時間である。上昇時間Ｔ１、Ｔ２は、回転ドラム３を所定の回転速度Ａから所定の回転速度Ｂまで上昇させるための所要時間を示す。降下時間ｔ１、ｔ２は、回転ドラム３の駆動を停止して惰性回転させたときに、所定の回転速度Ｃから所定の回転速度Ｄまで降下する際の所要時間を示す。上昇時間Ｔ１と降下時間ｔ１は、同一の布量で測定した場合を示し、上昇時間Ｔ２と降下時間ｔ２は、より大きい同一の布量で測定した場合を示す。合計時間（Ｔ１＋ｔ１）、および合計時間（Ｔ２＋ｔ２）は、上昇時間と降下時間の合計時間を示す。   The feature of the cloth amount detection method in the present embodiment will be described with reference to FIG. FIG. 2A shows the relationship between the frictional resistance of the drum rotating shaft, the time required for increasing the rotational speed of the rotating drum 3, and the time required for decreasing the rotational speed due to inertial rotation. The horizontal axis is the frictional resistance of the drum rotation axis, and the vertical axis is the time. The rising times T1 and T2 indicate the time required for raising the rotary drum 3 from the predetermined rotational speed A to the predetermined rotational speed B. The descent times t1 and t2 indicate the time required for the descent from the predetermined rotation speed C to the predetermined rotation speed D when driving of the rotary drum 3 is stopped and inertial rotation is performed. The rise time T1 and the fall time t1 indicate a case where measurement is performed with the same cloth amount, and the rise time T2 and the drop time t2 indicate a case where measurement is performed with a larger same cloth amount. The total time (T1 + t1) and the total time (T2 + t2) indicate the total time of the rise time and the fall time.

図２（ａ）に示されるように、回転ドラム３の回転速度を上昇させるときは、摩擦抵抗が大きくなる程、所要時間Ｔ１、Ｔ２が長くなる。回転ドラム３が惰性回転により回転速度が降下するときは、摩擦抵抗が大きくなる程、所要時間ｔ１、ｔ２が短くなる。そして、合計時間（Ｔ１＋ｔ１）、および合計時間（Ｔ２＋ｔ２）は、摩擦抵抗の影響が相殺されて、摩擦抵抗に係わりなく一定になる。合計時間（Ｔ１＋ｔ１）と合計時間（Ｔ２＋ｔ２）の差は、布量の相違に対応する。従って、合計時間（Ｔ＋ｔ）を判定値Ｓとして、図２（ｂ）に示すような布量との関係を測定しておけば、回転ドラム３を回転させて判定値Ｓを求め、図２（ｂ）の関係に基づき、ドラム回転軸の摩擦抵抗のバラツキの影響を回避して、精度よく布量を検知することができる。   As shown in FIG. 2A, when the rotational speed of the rotary drum 3 is increased, the required times T1 and T2 become longer as the frictional resistance increases. When the rotational speed of the rotating drum 3 decreases due to inertial rotation, the required times t1 and t2 become shorter as the frictional resistance increases. The total time (T1 + t1) and the total time (T2 + t2) are constant regardless of the frictional resistance because the influence of the frictional resistance is offset. The difference between the total time (T1 + t1) and the total time (T2 + t2) corresponds to the difference in the amount of cloth. Accordingly, if the relationship between the total time (T + t) and the cloth amount as shown in FIG. 2B is measured with the judgment value S, the judgment value S is obtained by rotating the rotary drum 3 and FIG. Based on the relationship b), it is possible to accurately detect the amount of cloth while avoiding the influence of variations in the frictional resistance of the drum rotation shaft.

図３は、本実施の形態における布量検知方法を示すフローチャートである。布量検知がスタートすると（ステップＳ１）、制御部３１は、ドラム駆動モータ７を駆動して、所定の回転速度Ａから、所定のトルクにより回転ドラム３の回転速度を上昇させて、所定の回転速度Ｂに到達させるように制御する（ステップＳ２）。回転ドラム３が回転速度Ｂに到達した時点で（ステップＳ３）、回転速度Ａから回転速度Ｂに到達するのに要した所要時間Ｔを算出する（ステップＳ４）。   FIG. 3 is a flowchart showing the cloth amount detection method according to the present embodiment. When the cloth amount detection starts (step S1), the control unit 31 drives the drum drive motor 7 to increase the rotation speed of the rotary drum 3 from the predetermined rotation speed A with a predetermined torque, and to perform a predetermined rotation. Control is performed to reach speed B (step S2). When the rotary drum 3 reaches the rotational speed B (step S3), a time T required to reach the rotational speed B from the rotational speed A is calculated (step S4).

次にドラム駆動モータ７を停止し、回転ドラム３の惰性回転を開始させる（ステップＳ５）。回転ドラム３が所定の回転速度Ｃから所定の回転速度Ｄに到達した時点で（ステップＳ６）、回転速度Ｃから回転速度Ｄに到達するのに要した所要時間ｔを算出する（ステップＳ７）。次に合計時間（Ｔ＋ｔ）＝判定値Ｓを求め（ステップＳ８）、予め測定しておいた判定値Ｓと布量の関係から、布量を求める（ステップＳ９）。   Next, the drum drive motor 7 is stopped and the inertial rotation of the rotary drum 3 is started (step S5). When the rotary drum 3 reaches the predetermined rotational speed D from the predetermined rotational speed C (step S6), a required time t required to reach the rotational speed D from the rotational speed C is calculated (step S7). Next, the total time (T + t) = determination value S is obtained (step S8), and the cloth amount is obtained from the relationship between the previously determined determination value S and the cloth amount (step S9).

（実施の形態２）
本発明の実施の形態２における洗濯機について、図４を参照して説明する。本実施の形態における洗濯機の構成、制御装置の構成、布量検知方法は、基本的には、実施の形態１
に記載のものと同様である。本実施の形態における相違点は、布量を検知するために回転ドラム３の回転速度を上昇させる際に、回転速度の上昇に伴う回転速度の変化に応じて、回転ドラム３の回転を駆動を停止させる制御を設けた点である。 (Embodiment 2)
A washing machine according to Embodiment 2 of the present invention will be described with reference to FIG. The configuration of the washing machine, the configuration of the control device, and the cloth amount detection method in the present embodiment are basically the same as those in the first embodiment.
It is the same as that of description. The difference in the present embodiment is that when the rotational speed of the rotary drum 3 is increased in order to detect the amount of cloth, the rotation of the rotary drum 3 is driven according to the change in the rotational speed accompanying the increase in the rotational speed. This is the point of providing control for stopping.

図４（ａ）は、回転ドラム３の回転速度が時間とともに上昇する様子を示す。横軸は、ドラム駆動モータ７を駆動して、所定のトルクにより回転ドラム３の回転速度を上昇させたときの経過時間、縦軸は回転ドラム３の回転速度である。図示のとおり、回転ドラム３の回転速度は一様に上昇するのではなく、上下動を繰り返しながら上昇してゆく。これは、回転ドラム３内に収容された洗濯物のバランスの影響で、洗濯槽が振動することに起因する。振動が大きくなり過ぎると、洗濯槽が洗濯機本体に衝突して異常音を発することになる。   FIG. 4A shows how the rotational speed of the rotating drum 3 increases with time. The horizontal axis represents the elapsed time when the drum drive motor 7 is driven and the rotational speed of the rotary drum 3 is increased by a predetermined torque, and the vertical axis is the rotational speed of the rotary drum 3. As shown in the figure, the rotational speed of the rotating drum 3 does not increase uniformly, but increases while repeating vertical movement. This is because the washing tub vibrates due to the balance of the laundry accommodated in the rotary drum 3. If the vibration becomes too large, the washing tub collides with the washing machine body and generates an abnormal sound.

本実施の形態では、そのような事態の発生を回避するための制御を行う。すなわち、回転ドラム３の回転を加速している途中における、所定回転角区間における回転ドラム３の回転速度について、最大回転速度と最小回転速度の差を検知する。その差が所定値以上である場合は、回転ドラム３の回転を停止するように制御する。所定回転角区間における回転ドラム３の最大回転速度と最小回転速度としては、例えば１回転中に４回、回転速度を測定し、その最大回転速度と最小回転速度を求める。   In the present embodiment, control for avoiding such a situation is performed. That is, the difference between the maximum rotation speed and the minimum rotation speed is detected for the rotation speed of the rotation drum 3 in a predetermined rotation angle section during the acceleration of the rotation of the rotation drum 3. If the difference is greater than or equal to a predetermined value, control is performed to stop the rotation of the rotary drum 3. As the maximum rotation speed and the minimum rotation speed of the rotary drum 3 in the predetermined rotation angle section, for example, the rotation speed is measured four times during one rotation, and the maximum rotation speed and the minimum rotation speed are obtained.

例えば図４（ｂ）に示すように、回転ドラム３の回転速度に対応させて、最大回転速度と最小回転速度の差の上限値を実験に基づいて設定し、制御部３１にテーブルとして備えておく。図４（ｂ）に示すような最大回転速度と最小回転速度の差の上限値は、回転ドラム３の各回転速度における、実験的に求めた振動の許容範囲に基づいて設定すればよい。   For example, as shown in FIG. 4B, an upper limit value of the difference between the maximum rotation speed and the minimum rotation speed is set based on the experiment in correspondence with the rotation speed of the rotary drum 3, and is provided as a table in the control unit 31. deep. The upper limit value of the difference between the maximum rotation speed and the minimum rotation speed as shown in FIG. 4B may be set based on an experimentally determined allowable vibration range at each rotation speed of the rotary drum 3.

このように、回転ドラム３の所定回転角区間における最大回転速度と最小回転速度の差が上限値を超えないように制御することにより、洗濯物のバランスが悪いことに起因して、洗濯槽が大きく振動し洗濯機本体に衝突するような事態を回避することができる。   In this way, by controlling so that the difference between the maximum rotation speed and the minimum rotation speed in the predetermined rotation angle section of the rotating drum 3 does not exceed the upper limit value, the laundry tub is It is possible to avoid such a situation that it vibrates greatly and collides with the washing machine body.

本発明によれば、回転ドラムに投入された布量を、簡単な構成で精度よく検知して、良好な脱水工程を行うことが可能であり、家庭用、業務用の洗濯機に有用である。   ADVANTAGE OF THE INVENTION According to this invention, it is possible to detect the quantity of cloth thrown into the rotating drum with a simple configuration with high accuracy, and to perform a good dehydration process, which is useful for household and commercial washing machines. .

本発明の実施の形態１におけるドラム式洗濯機の制御装置を示す回路図The circuit diagram which shows the control apparatus of the drum type washing machine in Embodiment 1 of this invention 同ドラム式洗濯機に用いられる布量検知方法の原理を示す図The figure which shows the principle of the cloth amount detection method used for the drum type washing machine 同布量検知方法を示すフローチャートFlow chart showing the cloth amount detection method 本発明の実施の形態２におけるドラム式洗濯機の制御方法を示す図The figure which shows the control method of the drum type washing machine in Embodiment 2 of this invention. ドラム式洗濯機の概略構成を示す断面図Sectional drawing which shows schematic structure of a drum type washing machine 従来例のドラム式洗濯機の布量検知方法を示す図The figure which shows the cloth amount detection method of the drum type washing machine of a prior art example

符号の説明Explanation of symbols

１ 洗濯機本体
２ 水槽
３ 回転ドラム
４ 衣類出入口
５ 扉
６ 透孔
７ ドラム駆動モータ
７ａ、７ｂ、７ｃ ３相巻線
８ 注水管路
９ 排水管路
１０ 操作パネル
１１ 循環送風経路
１２ 送風ファン
１３ フィルタ
１４ 回転検知部
２０ 商用電源
２１ 整流器
２２ チョークコイル
２３ 平滑コンデンサ
２４ インバータ回路
２４ａ〜２４ｆ スイッチング素子
２５ 入力設定部
２６ 負荷駆動部
２７ 給水弁
２８ 排水弁
２９ ヒータ
３０ａ、３０ｂ、３０ｃ 位置検出素子
３１ 制御部
３２ 駆動回路
３３ 回転速度検知部
３４ 布量検知部 DESCRIPTION OF SYMBOLS 1 Washing machine main body 2 Water tank 3 Rotating drum 4 Clothes entrance / exit 5 Door 6 Through-hole 7 Drum drive motor 7a, 7b, 7c Three-phase winding 8 Water injection line 9 Drain line 10 Operation panel 11 Circulation ventilation path 12 Blower fan 13 Filter DESCRIPTION OF SYMBOLS 14 Rotation detection part 20 Commercial power supply 21 Rectifier 22 Choke coil 23 Smoothing capacitor 24 Inverter circuit 24a-24f Switching element 25 Input setting part 26 Load drive part 27 Water supply valve 28 Drain valve 29 Heater 30a, 30b, 30c Position detection element 31 Control part 32 Drive circuit 33 Rotation speed detection unit 34 Cloth amount detection unit

Claims (2)

水平方向または傾斜方向に回転中心軸を有し、洗濯物を収容する回転ドラムと、
前記回転ドラムを回転自在に内包し洗濯機本体内に弾性的に支持された水槽と、
前記ドラムを回転駆動するドラム駆動モータと、
前記ドラム駆動モータの回転速度を検知する回転速度検知装置と、
前記回転速度検知装置の検知出力に基づき前記ドラム駆動モータの回転を制御する制御部とを備えた洗濯機において、
前記制御部は、前記洗濯物の量である布量を検知するために、前記ドラム駆動モータにより所定のトルクで前記回転ドラムの回転を加速して、回転速度Ａから回転速度Ｂに到達するまでの上昇時間Ｔを測定し、かつ前記ドラム駆動モータによる駆動を停止して前記回転ドラムを惰性回転させたときに、回転速度Ｃから回転速度Ｄに到達するまでの降下時間ｔを測定し、前記上昇時間Ｔと前記降下時間ｔに基づき、前記布量を検知することを特徴とする洗濯機。 A rotating drum having a central axis of rotation in a horizontal direction or an inclined direction and accommodating laundry;
A water tub enclosing the rotating drum rotatably and elastically supported in the washing machine body;
A drum drive motor for rotationally driving the drum;
A rotational speed detection device for detecting the rotational speed of the drum drive motor;
In the washing machine provided with a control unit that controls the rotation of the drum drive motor based on the detection output of the rotation speed detection device,
The control unit accelerates the rotation of the rotating drum with a predetermined torque by the drum drive motor to detect the amount of cloth, which is the amount of the laundry, until the rotation speed A reaches the rotation speed B. And the descent time t from the rotational speed C to the rotational speed D when the rotary drum is inertially rotated after stopping the driving by the drum drive motor is measured, A washing machine that detects the amount of cloth based on a rise time T and a fall time t. 前記回転制御部は、前記布量を検知する工程で前記回転ドラムの回転を加速している途中における、所定回転角区間における前記回転ドラムの最大回転速度と最小回転速度を計測し、最大回転速度と最小回転速度の差が所定値以上である場合は、前記回転ドラムの回転駆動を停止する請求項１に記載の洗濯機。   The rotation control unit measures the maximum rotation speed and the minimum rotation speed of the rotating drum in a predetermined rotation angle section in the middle of accelerating the rotation of the rotating drum in the step of detecting the cloth amount, and the maximum rotation speed The washing machine according to claim 1, wherein when the difference between the rotation speed and the minimum rotation speed is equal to or greater than a predetermined value, the rotation driving of the rotating drum is stopped.
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