JPH04256786A - Washing machine - Google Patents

Washing machine

Info

Publication number
JPH04256786A
JPH04256786A JP3017409A JP1740991A JPH04256786A JP H04256786 A JPH04256786 A JP H04256786A JP 3017409 A JP3017409 A JP 3017409A JP 1740991 A JP1740991 A JP 1740991A JP H04256786 A JPH04256786 A JP H04256786A
Authority
JP
Japan
Prior art keywords
rotation speed
speed
induction motor
power switch
control device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3017409A
Other languages
Japanese (ja)
Inventor
Yoshitoyo Kenjo
見城 好豊
Fumio Ota
文夫 太田
Morinori Fukuda
守記 福田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP3017409A priority Critical patent/JPH04256786A/en
Publication of JPH04256786A publication Critical patent/JPH04256786A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To surely stop the induction motor-driven material even when a rotating speed control system is abnormal by turning off a power source switch, in the case the number of pulse signals inputted from a revolution speed detecting part exceeds the prescribed speed of revolution. CONSTITUTION:A speed controller 10 is constituted of a revolution speed detecting part 11 for generating a signal of a pulse period corresponding to the speed of revolution of an induction motor-driven material 5, an electric conduction ratio control part 12 for controlling an optimal electric conduction ratio by its pulse signal, and a driving part 13 for applying a gate signal of a bidirectional thyristor. A power source switch control part 18 is operated by a command of the electric conduction ratio control part 12 and to an arithmetic part 14 for driving a power source switch 19, a set value fS and a pulse signal from the revolution speed detecting part 11 are inputted. This data is sent to a deciding part 17 and compared with the upper and the lower limit values set in advance, and in the case its data deviates from the upper and the lower limit values, it is decided that the rotation is abnormal, and its signal is sent to the power source switch controller 18. Accordingly, in the case abnormality is generated in the rotating speed control system, safety can be secured by tuning off the power source.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、駆動源としての誘導電
動機の速度制御機能を有する洗濯機に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine having a speed control function using an induction motor as a driving source.

【0002】0002

【従来の技術】近年、衛生指向から出来るだけ多くの種
類の衣類を家庭で洗いたいという欲求があり、また汚れ
たから洗うから着たから洗うとしう生活習慣の変化があ
り、洗濯機の洗い方に幅を持たせる必要が生じてきた。 そのため、攪拌翼を駆動する誘導電動機を速度制御する
洗濯機が提案されている。
[Prior Art] In recent years, there has been a desire to wash as many types of clothes as possible at home due to hygiene considerations, and there has also been a change in lifestyle habits, from washing when dirty to washing after wearing. It became necessary to have some breadth. Therefore, a washing machine has been proposed in which the speed of an induction motor that drives an agitating blade is controlled.

【0003】このような速度制御機能をもつ洗濯機は、
その制御系に万一故障が生じたとき、誘導電動機が高速
回転に陥ることがあり、特に脱水時には脱水槽が高速回
転し、時には脱水槽が破損する危険がある。こうしたこ
とに対して従来は、制御系に設けた回転数検知部の検知
パルス数が規定値を越えたとき、速度制御装置で通電比
を零とし、誘導電動機を停止させるようにしていた。
[0003] A washing machine with such a speed control function is
In the unlikely event that a failure occurs in the control system, the induction motor may rotate at high speed, and the dehydration tank may rotate at high speed, especially during dehydration, and there is a risk that the dehydration tank may be damaged. In response to this, conventionally, when the number of pulses detected by a rotation speed detection section provided in a control system exceeds a specified value, a speed control device sets the energization ratio to zero and stops the induction motor.

【0004】0004

【発明が解決しようとする課題】このような従来の洗濯
機では、回転数検知部または回転数検知部から速度制御
装置までの系に故障が生じた場合、回転数を検知するた
めのパルスが速度制御装置に伝達されないため、通電比
の制御ができなくなり、誘導電動機は最高速度で回転し
危険な状態になるのに停止することができないという問
題を有していた。
[Problems to be Solved by the Invention] In such conventional washing machines, if a failure occurs in the rotation speed detection section or the system from the rotation speed detection section to the speed control device, the pulse for detecting the rotation speed is interrupted. Since the information is not transmitted to the speed control device, the energization ratio cannot be controlled, causing the induction motor to rotate at maximum speed and be unable to stop even though it is in a dangerous state.

【0005】また、速度制御装置から誘導電動機までの
系に故障が生じた場合、たとえば、双方向性サイリスタ
がショートした場合、速度制御装置で通電比を零にして
も、誘導電動機は最高速度で回転し、停止させることは
できないという問題を有していた。
Furthermore, if a failure occurs in the system from the speed control device to the induction motor, for example, if a bidirectional thyristor shorts out, the induction motor will not reach its maximum speed even if the energization ratio is set to zero in the speed control device. The problem was that it rotated and could not be stopped.

【0006】本発明は上記課題を解決するもので、速度
制御系とは別の系との組み合わせにより、不安全時に誘
導電動機を確実に停止させることを目的としている。
The present invention is intended to solve the above-mentioned problems, and aims to reliably stop an induction motor in an unsafe situation by combining the speed control system with a system other than the speed control system.

【0007】[0007]

【課題を解決するための手段】本発明は上記目的を達成
するために、電源スイッチと、前記電源スイッチの動作
を制御する電源スイッチ制御装置と、双方向性サイリス
タと進相用コンデンサとで駆動される誘導電動機と、前
記誘導電動機の回転数を制御する速度制御装置とを備え
、前記速度制御装置は前記誘導電動機の回転数に応じた
周期のパルス信号を発生する回転数検知部と、前記パル
ス信号を入力とし所望回転数に対し最適な通電比を制御
する通電比制御部と、前記通電比制御部の出力により前
記双方向性サイリスタを駆動する駆動部とからなり、前
記通電比制御部は回転数検知部から入力されるパルス信
号の数が所望回転数に対して決められた幅を外れた場合
、前記電源スイッチ制御装置により前記電源スイッチを
OFFにするようにしたことを課題解決手段としている
[Means for Solving the Problems] In order to achieve the above object, the present invention is driven by a power switch, a power switch control device that controls the operation of the power switch, a bidirectional thyristor, and a phase advancing capacitor. and a speed control device that controls the rotation speed of the induction motor, and the speed control device includes a rotation speed detection unit that generates a pulse signal with a period corresponding to the rotation speed of the induction motor; The energization ratio control section includes a energization ratio control section that inputs a pulse signal and controls an optimal energization ratio for a desired rotation speed, and a drive section that drives the bidirectional thyristor based on the output of the energization ratio control section. The problem solving means is that the power switch is turned off by the power switch control device when the number of pulse signals inputted from the rotation speed detection section deviates from a predetermined range with respect to the desired rotation speed. It is said that

【0008】[0008]

【作用】本発明は上記した課題解決手段により、回転数
検知部または回転数検知部から速度制御装置までの系に
故障が生じた場合、回転数を検知するためのパルス信号
が速度制御装置に伝達されず、回転数を検知するパルス
数が所望回転数に対して決められた幅に達しないため速
度制御装置は制御系が故障したと判断し、電源スイッチ
制御装置に電源スイッチOFFの信号を出し、電源スイ
ッチがOFFにされ、全体の電源が切られて安全を確保
できる。
[Operation] By means of the above-mentioned problem solving means, the present invention provides a pulse signal for detecting the rotation speed to the speed control device when a failure occurs in the rotation speed detection section or the system from the rotation speed detection section to the speed control device. The speed controller determines that the control system has failed, and sends a signal to the power switch controller to turn off the power switch. The power switch is turned off to ensure safety by turning off the entire power supply.

【0009】また、速度制御装置から誘導電動機までの
系に故障が生じた場合、たとえば双方向性サイリスタが
ショートした場合、速度制御装置で所望回転数になるよ
う通電比を制御しても誘導電動機には商用電源の電圧が
加わるため、誘導電動機は最高速度で回転し、その結果
、速度制御装置に入力される回転数を検知するためのパ
ルス信号のパルス数が所望回転数に対して決められた幅
を越えるため、速度制御装置は制御系が故障したと判断
し、電源スイッチ制御装置に電源スイッチOFFの信号
を出し、電源スイッチOFFにされ、安全を確保するこ
とができる。
Furthermore, if a failure occurs in the system from the speed control device to the induction motor, for example if a bidirectional thyristor shorts out, even if the speed control device controls the energization ratio to achieve the desired rotation speed, the induction motor will fail. Since the commercial power voltage is applied to the induction motor, the induction motor rotates at maximum speed, and as a result, the number of pulses of the pulse signal for detecting the rotation speed input to the speed control device is determined based on the desired rotation speed. The speed control device determines that the control system has failed, and sends a signal to the power switch control device to turn off the power switch, thereby ensuring safety.

【0010】0010

【実施例】以下、本発明の一実施例について、図1に基
づいて説明する。
[Embodiment] An embodiment of the present invention will be described below with reference to FIG.

【0011】図に示すように、外槽は内部に洗濯兼脱水
槽2を回転自在に設け、洗濯兼脱水槽2の内低部に攪拌
翼3を設けている。メカ装置4は洗濯兼脱水槽2と攪拌
翼3の回転を制御する減速機,ワンウエイクラッチ,ブ
レーキなどから構成している。誘導電動機5は双方向性
サイリスタ6,7と進相用コンデンサ8とで2相駆動さ
れ、インペラプーリー9により回転をメカ装置4に伝え
る。速度制御装置10は、誘導電動機5の回転数を制御
するもので、誘導電動機5の回転数に応じたパルス周期
の信号を発生する回転数検知部11と、この回転数検知
部11のパルス信号により最適な通電比を制御する通電
比制御部12と、双方向性サイリスタのゲート信号を与
える駆動部13とで構成している。また、通電比制御部
12は演算部14,カウンター部15,タイミング発生
部16および判定部17により構成している。電源スイ
ッチ制御装置18は通電比制御部12の指令で動作し、
電源スイッチ19を駆動する。
As shown in the figure, the outer tank has a washing and dehydrating tank 2 rotatably provided therein, and an agitating blade 3 is provided at the inner lower part of the washing and dehydrating tank 2. The mechanical device 4 includes a speed reducer for controlling the rotation of the washing/dehydration tank 2 and the stirring blades 3, a one-way clutch, a brake, and the like. The induction motor 5 is driven in two phases by bidirectional thyristors 6 and 7 and a phase advance capacitor 8, and transmits rotation to the mechanical device 4 by an impeller pulley 9. The speed control device 10 controls the rotation speed of the induction motor 5, and includes a rotation speed detection section 11 that generates a signal with a pulse period corresponding to the rotation speed of the induction motor 5, and a pulse signal of the rotation speed detection section 11. The energization ratio control section 12 controls the optimum energization ratio, and the drive section 13 provides a bidirectional thyristor gate signal. Further, the energization ratio control section 12 includes a calculation section 14, a counter section 15, a timing generation section 16, and a determination section 17. The power switch control device 18 operates according to instructions from the energization ratio control section 12,
Power switch 19 is driven.

【0012】以上の構成において、まず回転速度制御の
動作について説明すると、双方向性サイリスタ6,7を
動作させて誘導電動機5を駆動し、洗濯兼脱水槽2また
は攪拌翼3を駆動する。このとき、回転数検知部11か
ら図2に示すような周期TFB(周波数fFB=1/T
FB)の短形はが出力され、通電比制御部12の演算部
14に入力される。演算部14では設定値fsとの偏差
Δf=fFB−fsに適当な比例定数を乗じた値で、カ
ウンター部15の目標値を増減して非導通時間を決めて
いる。そこで決定した目標値でタイミング発生部16の
タイミングパルスに同期してカウンターがスタートし、
目標値となると出力を反転する。カウンターがスタート
するタイミングで駆動部13よりオフ信号が出力され、
そのカウンターが目標値に到達したときにオン信号が出
力される。そのとき商用電源の半波の周期Tに対するオ
ン時間との比、すなわち(T−Toff)/Tを通電比
と呼び、このTOFFで所望回転数を制御している。こ
れは、たとえば設定値を一定とした場合、負荷重くなり
回転数が低下すると(回転周期が長くなると)、カウン
ターの目標値を小さくする。その結果、通電比は大きく
なり誘導電動機5の印加電圧の実効値が高くなり、回転
力が大きくなる。また逆に、負荷が軽くなり回転数が上
昇すると(回転周期が短くなると)、カウンターの目標
値が大きくなる。このため通電比は小さくなり誘導電動
機5の印加電圧の実効値が低くなり、その結果、回転力
が小さくなる。このようにして回転数を検知し、その大
きさに応じて誘導電動機5に印加される実効値電圧、す
なわち回転力を制御し負荷によらず、安定した回転が得
られる。
In the above configuration, first, the operation of controlling the rotational speed will be explained. The bidirectional thyristors 6 and 7 are operated to drive the induction motor 5, and the washing/drying tank 2 or the stirring blade 3 is driven. At this time, the rotation speed detection unit 11 detects a period TFB (frequency fFB=1/T) as shown in FIG.
The rectangular form of FB) is output and input to the calculation section 14 of the energization ratio control section 12. The calculation unit 14 increases or decreases the target value of the counter unit 15 using a value obtained by multiplying the deviation Δf=fFB−fs from the set value fs by an appropriate proportionality constant to determine the non-conduction time. The counter starts at the determined target value in synchronization with the timing pulse of the timing generator 16,
When the target value is reached, the output is reversed. At the timing when the counter starts, the drive unit 13 outputs an off signal,
An on signal is output when the counter reaches the target value. At this time, the ratio of the on time to the half-wave period T of the commercial power supply, that is, (T-Toff)/T, is called the energization ratio, and the desired rotation speed is controlled by this TOFF. This means that, for example, when the set value is constant, when the load becomes heavier and the rotation speed decreases (when the rotation period becomes longer), the target value of the counter is decreased. As a result, the energization ratio increases, the effective value of the voltage applied to the induction motor 5 increases, and the rotational force increases. Conversely, as the load becomes lighter and the rotation speed increases (as the rotation period becomes shorter), the target value of the counter increases. Therefore, the energization ratio becomes smaller, and the effective value of the voltage applied to the induction motor 5 becomes lower, and as a result, the rotational force becomes smaller. In this way, the rotational speed is detected, and the effective value voltage applied to the induction motor 5, that is, the rotational force, is controlled according to the magnitude of the rotational speed, and stable rotation can be obtained regardless of the load.

【0013】つぎに、回転速度制御の系に異常が生じた
場合の動作について説明する。演算部14には設定値f
s(所望回転数に比例)と回転数検知部11からのパル
ス信号とが入力されている。したがって、この2つの信
号から所望回転数と検知パルスとの関係データができる
。このデータを判定部17に送り、図3に示すようにあ
らかじめ設定した上下限値と比較し、上下限値から外れ
た場合は回転異常と判定し、その信号を電源スイッチ制
御装置18に送る。電源スイッチ制御装置18はこの信
号を受けて電源スイッチ19をOFFにする。したがっ
て、回転速度制御の系に異常が生じた場合、電源を切っ
て安全を確保することができる。
Next, the operation when an abnormality occurs in the rotational speed control system will be explained. The calculation unit 14 has a set value f.
s (proportional to the desired rotation speed) and a pulse signal from the rotation speed detection section 11 are input. Therefore, relationship data between the desired rotation speed and the detection pulse can be obtained from these two signals. This data is sent to the determination section 17 and compared with upper and lower limit values set in advance as shown in FIG. The power switch control device 18 receives this signal and turns off the power switch 19. Therefore, if an abnormality occurs in the rotational speed control system, the power can be turned off to ensure safety.

【0014】なお、近年洗濯機にはオートオフスイッチ
が付いており、電源スイッチ制御装置18と電源スイッ
チ19は、このオートオフスイッチを活用でき、殆どコ
ストアップなしに実施することができる。
Incidentally, in recent years, washing machines have been equipped with an auto-off switch, and the power switch control device 18 and the power switch 19 can utilize this auto-off switch, and can be implemented with almost no increase in cost.

【0015】[0015]

【発明の効果】以上の実施例から明かなように本発明に
よれば、電源スイッチと、前記電源スイッチの動作を制
御する電源スイッチ制御装置と、誘導電動機の回転数を
制御する速度制御装置とを備え、前記速度制御装置は前
記誘導電動機の回転数に応じた周期のパルス信号を発生
する回転数検知部と、前記パルス信号を入力とし所望回
転数に対し最適な通電比を制御する通電比制御部とを有
し、前記通電比制御部は回転数検知部から入力されるパ
ルス信号の数が所望回転数に対して決められた幅を外れ
た場合、前記電源スイッチ制御装置により前記電源スイ
ッチをOFFにするようにしたから、速度制御系とは別
の系との組み合わせにより回転速度制御の系に異常が生
じた場合、殆どコストをかけないで、電源を切って安全
を確保することができる。
As is clear from the above embodiments, the present invention provides a power switch, a power switch control device for controlling the operation of the power switch, and a speed control device for controlling the rotational speed of an induction motor. The speed control device includes a rotation speed detection section that generates a pulse signal with a period corresponding to the rotation speed of the induction motor, and an energization ratio that receives the pulse signal as an input and controls an optimal energization ratio for a desired rotation speed. and a control section, the energization ratio control section controls the power switch by the power switch control device when the number of pulse signals input from the rotation speed detection section is out of a width determined for the desired rotation speed. Since the speed control system is turned off, if an abnormality occurs in the rotational speed control system due to a combination with a system other than the speed control system, it is possible to turn off the power and ensure safety with almost no cost. can.

【図面の簡単な説明】[Brief explanation of the drawing]

【図1】本発明の一実施例の洗濯機のシステム構成図FIG. 1: System configuration diagram of a washing machine according to an embodiment of the present invention.


図2】同洗濯機の回転数検知部の出力波形図
[
Figure 2: Output waveform diagram of the rotation speed detection section of the washing machine

【図3】同
洗濯機の異常時の判定を説明するための図
[Figure 3] Diagram for explaining determination when the washing machine is abnormal

【符号の説明】[Explanation of symbols]

5    誘導電動機 6,7    双方向性サイリスタ 8    進相コンデンサ 10    速度制御装置 11    回転数検知部 12    通電比制御部 13    駆動部 18    電源スイッチ制御装置 19    電源スイッチ 5 Induction motor 6,7 Bidirectional thyristor 8 Phase advance capacitor 10 Speed control device 11 Rotation speed detection part 12             Electrification ratio control section 13   Drive part 18 Power switch control device 19 Power switch

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】  電源スイッチと、前記電源スイッチの
動作を制御する電源スイッチ制御装置と、双方向性サイ
リスタと進相用コンデンサとで駆動される誘導電動機と
、前記誘導電動機の回転数を制御する速度制御装置とを
備え、前記速度制御装置は前記誘導電動機の回転数に応
じた周期のパルス信号を発生する回転数検知部と、前記
パルス信号を入力とし所望回転数に対し最適な通電比を
制御する通電比制御部と、前記通電比制御部の出力によ
り前記双方向性サイリスタを駆動する駆動部とからなり
、前記通電比制御部は回転数検知部から入力されるパル
ス信号の数が所望回転数に対して決められた幅を外れた
場合、前記電源スイッチ制御装置により前記電源スイッ
チをOFFにするようにしてなる洗濯機。
1. A power switch, a power switch control device that controls the operation of the power switch, an induction motor driven by a bidirectional thyristor and a phase advancing capacitor, and a rotation speed of the induction motor. a speed control device, the speed control device includes a rotation speed detection unit that generates a pulse signal with a period corresponding to the rotation speed of the induction motor, and a rotation speed detection unit that receives the pulse signal as input and determines an optimum energization ratio for a desired rotation speed. The energization ratio control section includes a energization ratio control section that controls the energization ratio control section, and a drive section that drives the bidirectional thyristor based on the output of the energization ratio control section. The washing machine is configured to turn off the power switch by the power switch control device when the rotation speed deviates from a predetermined width.
JP3017409A 1991-02-08 1991-02-08 Washing machine Pending JPH04256786A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3017409A JPH04256786A (en) 1991-02-08 1991-02-08 Washing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3017409A JPH04256786A (en) 1991-02-08 1991-02-08 Washing machine

Publications (1)

Publication Number Publication Date
JPH04256786A true JPH04256786A (en) 1992-09-11

Family

ID=11943206

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3017409A Pending JPH04256786A (en) 1991-02-08 1991-02-08 Washing machine

Country Status (1)

Country Link
JP (1) JPH04256786A (en)

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