JP3809588B2 - Vacuum cleaner - Google Patents

Description

【００４４】
図５はゴミ量と回転数の関係を示すグラフで、グラフ中の実線はゴミ量と回転数を実測したデータの実測線であり、一点鎖線は開放時の回転数とゴミ量１００％の回転数を直線補間した線であり、ゴミ量と回転数の間に一定の関係が成立している。そして、その直線補間した線に基づいて強、中、弱の運転モードのそれぞれに対応したゴミ量と回転数との相関関係を示すデータを記憶したデータテーブル３３を作成しておく。
【００４５】
そこで、電気掃除機の掃除中に、回転数検出手段であるホール素子２８がブラシレスモータ４の回転数を検出しおり、ゴミ量判定手段３４がホール素子２８が検出した検出信号の回転数とデータテーブル３３の運転中における運転モードに対応した回転数とを比較し、ホール素子２８の回転数と一致するデータテーブルのそのときの運転モードにおける回転数に対応したゴミ量のデータを出力する。そうすると、ゴミ量表示器８ｄは表示ゴミ量判定手段３４の出力信号によりゴミ量を複数のＬＥＤを使って図６に示すように紙パック３内のゴミ量の割合をそのまま表示するから、使用者は各運転モードにおける集塵室２内のゴミ量を回転数より知ることができる。
【００４６】
実施例２
また、上記３つの運転モードのそれぞれに対応したゴミ量と回転数との相関関係を示すデータを記憶したデータテーブル３３は製品出荷時における所定の入力電流のときのゴミの無い状態での回転数を基準に作成もしくは補正することにより、個々の電気掃除機毎に正確なゴミ量検知ができる。
【００４７】
実施例３
電気掃除機の掃除中に、回転数検出手段であるホール素子２８がブラシレスモータ４の回転数を検出しており、吸い付き状態判定手段３６がホール素子２８が検出した検出信号の回転数と吸い付き状態記憶メモリ３５のそのときの運転モードにおける基準値とを比較し、ホール素子２８の検出信号の回転数が吸い付き状態記憶メモリ３５の基準値を越えたときに吸い付き状態を示す信号を出力する。そうすると、教示手段であるＬＥＤからなる吸い付き状態表示器８ｂが吸い付き状態判定手段３６の吸い付き状態を示す信号に基づき吸い付き状態を点灯、又は点滅によって吸い付き状態を教示するから、使用者は電気掃除機本体１の吸い込み口にカーテンや新聞紙等が吸い付いたときに生じるブラシレスモータ４の回転数が一気に上昇するというブラシレスモータ４の暴走を知らせることができる。これは、電気掃除機本体１の吸い込み口にカーテンや新聞紙が吸い付いたとき、モータ負荷は急激に軽くなり、回転数は一気に上昇し、モータ軸、及びベアリングに負担をかけ、又空気の循環も無くなるためモータ温度が上昇し、ブラシレスモータ４の寿命を短くしてしまうのを防止するためである。
また、これを知った人は電気掃除機本体１の吸い込み口からカーテンや新聞紙等を取り除くことにより、正常な運転に復帰することとなる。なお、この実施例では、教示手段としてＬＥＤからなる吸い付き状態表示器８ｂとしているが、警告音を発するブザーであってもよいことは勿論である。
【００４８】
実施例４
この実施例は、モータ停止手段３８が吸い付き状態判定手段３６の吸い付き状態を示す信号に基づきＰＷＭ制御回路２４にモータ停止信号を出力する。そして、ＰＷＭ制御回路２４はモータ停止信号を受けてモータを停止させるから、電気掃除機本体１の吸い込み口にカーテンや新聞紙等が吸い付いたときに生じるブラシレスモータ４の暴走を回避でき、自動的にブラシレスモータ４が保護される。また、吸い付き物は吸い込み口から自然と離れるか、手で取り除くときには容易に取り除くことができる。
【００４９】
実施例５
図７は吸い付き状態を検知した時に所定時間経過後に電源をオフさせるフローチャートで、このフローチャートに基づき実施例の動作を説明する。
この実施例では、まず電気掃除機の掃除中に吸い付き状態判定手段３６が吸い付き状態か否かを判定する（Ｓ１）。吸い付き状態でなければ、タイマをストップしてリセットし（Ｓ２）、通常動作に入る（Ｓ３）。また、吸い付き状態であれば、減速または停止・復帰指令手段４１が吸い付き状態判定手段３６の吸い付き状態を示す信号に基づきＰＷＭ制御回路２４に対してそのときの運転モードにおいて設定されたブラシレスモータ４の回転数よりも相当低い回転数に減速するか、停止させる指令を出力してブラシレスモータ４を減速させるか、停止させるかの吸い付き処理を行う（Ｓ４）。
【００５０】
それから、タイマをスタートさせ（Ｓ５）、例えば吸い付き物を取り除ける５〜２０秒の所定時間が経過したか否かをみ（Ｓ６）、所定時間経過したらモータの回転数をそのときの運転モードにおいて設定された回転数に復帰させる指令をＰＷＭ制御回路２４に出力してブラシレスモータ４の回転数を当初の運転モードにおいて設定された回転数に復帰させる（Ｓ７）。従って、ブラシレスモータ４に負担をかけること無く吸い付き物を取り除け、再び円滑に掃除状態に入ることができる。
【００５１】
実施例６
この実施例は、減速または停止・復帰指令手段４１の指令出力後はブラシレスモータ４の回転数が当初の運転モードにおいて設定された回転数に復帰するが、その後の掃除中に再び電気掃除機本体１の吸い込み口にカーテンや新聞紙等が吸い付くと、実施例５の動作を繰り返す。そして、かかる動作は永久に繰り返されることになる。そこで、停止指令手段４２が吸い付き状態判定手段３６が吸い付き状態を示す信号を出力した回数をカウントしてカウント値が例えば３０回を越えたら、例えば３分経過後にＰＷＭ制御回路２４にモータ停止信号を出力してブラシレスモータ４を停止させる。このようにすることにより、密閉運転によるモータの発熱の危険が避けられる。
【００５２】
実施例７
図８はモータの回転数が変わらない状態が一定時間連続して続いたらモータを停止させるフローチャートで、このフローチャートに基づき実施例の動作を説明する。
まず、電気掃除機の電源を入れると、マイクロコンピュータ２２はＲＡＭチェック、ポート設定等の初期処理を行い（Ｓ１０）、次に、操作指令部２３からの指令に基づき掃除機のモードを変更（入力処理し）、表示部８への表示データに基づき一括表示処理を行い（Ｓ１１）、電気掃除機のブラシレスモータ４が回転しているか否かを見る（Ｓ１２）。そして、電気掃除機の掃除中となると、回転数検出手段であるホール素子２８がブラシレスモータ４の回転数を検出しており、オートパワーオフ制御手段３７がホール素子２８が検出した検出信号の回転数を例えば０．２５ｓｅｃ間隔でサンプルホールドし（Ｓ１３）、サンプルホールドした今回回転数Ｎｎを前回のサンプルホールドした回転数Ｎｎ−1 と比較し、その差の絶対値が例えば３０回転とした所定値Ｘが以下か否かを見て回転数が実質的に変わらない状態にあるかどうかを確認する（Ｓ１４）。
【００５３】
回転数が実質的に変わっている状態であれば、オートパワーオフ制御手段３７をオフさせてタイマをストップしてリセットする（Ｓ１５）、つぎにその回転数が吸い付き状態の回転数を越えているか否かを見る（Ｓ１６）。このときの吸い付き状態の回転数は、例えば中の運転モードのときは２５０００ｒｐｍ、強の運転モードのときは３３３００ｒｐｍである。そして、回転数が吸い付き状態の回転数を越えていないときは、その回転数に基づいて実施例１に示すようにゴミ量を計算し、ゴミ量を表示する（Ｓ１７）。また、回転数が吸い付き状態の回転数を越えているときは、その越えた状態が例えば２秒間続くかどうかを見て（Ｓ１８）、２秒間続かなければステップＳ１７に戻り、２秒間続けば、回転数をおとすか、或いは停止させて吸い付き防止処理に入る（Ｓ１９）。この吸い付き防止処理におけるモータの回転数をおとすか、或いは停止させる時間は使用者が吸い付き物を取り除ける時間として例えば７秒としている。その時間が過ぎても吸い付き物が取れないときは、実施例６で示したように実施例５の動作を複数回繰り返した後ＰＷＭ制御回路２４にモータ停止信号を出力してブラシレスモータ４を停止させる。また、吸い付き物が実施例５の動作中に取れた場合はステップＳ１１に戻る。
【００５４】
一方、回転数が実質的に変わっていない状態であれば、オートパワーオフ制御手段３７がオンしてオートパワーオフのタイマーをスタートさせ（Ｓ２０）、それから例えば３分間経過したか否かをみる（Ｓ２１）。そして、その３分間の間はステップＳ１６に戻り、３分間経過したときにはオートパワーオフ処理をしてモータを止め、異常を教示し（Ｓ２２）、ステップＳ１１に戻る。
このように、オートパワーオフ制御手段３７がモータの回転数を所定時間間隔でサンプルホールドし、サンプルホールドした回転数を前回のサンプルホールドした回転数と比較し、回転数が実質的に変わらない状態を確認し、その回転数が実質的変わらない状態が一定時間連続して続いたらモータを停止させる。以上のような動作は電源の切り忘れ等により電気掃除機を掃除状態で放置した場合にブラシレスモータ４の回転数が何等変化しない状態に実行され、モータが自動的に停止させられるため、安全であり、省エネルギーともなる。
【００５５】
実施例８
電気掃除機に使用される商用電源は通常ＡＣ１００Ｖであるが、実際は許容範囲±１０％の場合９０Ｖ〜１１０Ｖの間で変動している。すると図４に示すように、モータの回転数は電源電圧の影響を非常に受けやすいので、電圧によって回転数の補正を行う必要があり、また必要に応じてモータを止める必要がある。今回のようなブラシレスモータ４において羽根負荷の場合、出力Ｐは回転数Ｎの３乗に比例することから、ＡＣ１００Ｖ入力時の回転モード入力電流を指定しておくと、回転数からその時の電圧値を計算から推測することができる。このように出力Ｐは回転数Ｎの３乗に比例し、その出力Ｐは電圧Ｖと電流Ｉとの積であるから、ＶＩはＮの３乗に比例することになり、電流Ｉを一定とすると、ＶはＮの３乗に比例することになる。となる。ここで、直流電源（ここでは整流回路２０と分圧器２１を指す）の初期電圧Ｖ１のとき、Ｖ1 はＮ１の３乗に比例することになり、直流電源の現在電源Ｖ２のときはＶ2 はＮ２の３乗に比例することとなるから、下記の関係式が成立する。
Ｖ２／Ｖ１・ｋ＝Ｎ２／Ｎ１
【００５６】
従って、初期回転数Ｎ１及び現在回転数Ｎ２と直流電源の初期電圧Ｖ１が分かれば、直流電源の現在電源Ｖ２を求めることができる。
この実施例は、電圧演算手段４３がブラシレスモータの回転数を検出するホール素子２８が検出した検出信号の初期回転数Ｎ１及び現在回転数Ｎ２と直流電源の初期電圧Ｖ１とに基づき、上記関係式から、直流電源の現在電源Ｖ２を演算し、モータ停止判断手段は電圧演算手段４３が演算した現在電源Ｖ２と予め設定された初期電圧Ｖ１より所定電圧だけ大きい例えば１１５Ｖの上限値Ｖｕと初期電圧Ｖ１より所定電圧だけ小さい例えば８５Ｖの下限値Ｖｄとを比較し、電圧演算手段４３が演算した現在電源Ｖ２が上記上限値Ｖｕ又は下限値Ｖｄを越えたときにＰＷＭ制御回路２４にモータ停止信号を出力し、ＰＷＭ制御回路２４はモータ停止信号に基づいてブラシレスモータ４を停止させるから、電源電圧が上昇又は下降するという電圧変動の異常が有ったときにはブラシレスモータ４が停止させられる。
【００５７】
実施例９
商用電源に電圧変動があったとき、回転数も変化するから、ＡＣ１００Ｖのときを基準にした回転数に基づいて作成した実施例１に示すデータテーブルを３３や、ＡＣ１００Ｖのときを基準にした実施例２に示す吸い付き状態を示す基準値によってゴミ量検知や吸い付き状態検知しても正確な検知ができない。
そこで、この実施例は、商用電源に電圧変動に対してインバータ２６に供給される直流電源も商用電源の電圧変動に対応して変動することを利用してＡＣ１００Ｖの時の回転数に補正するものである。
【００５８】
かかる回転数の補正は、補正回転数演算手段４５が回転検出手段であるホール素子２８が検出した現在回転数Ｎ２と直流電源の初期電圧Ｖ１、電圧計測手段が計測した現在電圧Ｖ２、とに基づき、Ｖ２／Ｖ１・ｋ＝Ｎ２／Ｎｃ、 Ｎｃ＝Ｎ２・［１＋｛（Ｖ１／Ｖ２）−１｝・Ｋ］の式から補正回転数Ｎｃを演算する。従って、電圧変動があったとしてもその補正回転数Ｎｃを用いることにより、正確なゴミ量検知や吸い付き状態検知が可能となる。
つぎに、回転数における実際の補正計算例を示す。
実際の補正計算は下記表２の如く、運転モード毎に直流電圧Ｖ１とモード係数を選択して補正計算を行っている。
【００５９】
【表２】

【００６０】
実施例１０
この実施例は、ゴミ量をリニアに表示することができるようにしたもので、ゴミ量演算手段４６が補正回転数演算手段４５が演算した補正回転数Ｎｃと、ゴミ量ゼロの時の初期回転数Ｎ１と、ゴミ量１００％のときの回転数上昇分Ｎ100 とに基づき、 ゴミ量（％）＝（Ｎｃ−Ｎ１）／Ｎ100 ×100 という関係式からゴミ量を演算する。そして、ゴミ量表示器８ｄがゴミ量演算手段４５の出力信号の演算値によりゴミ量をレベルで表示しており、電圧変動があったとしてもその補正回転数Ｎｃを用いることにより、正確なゴミ量をリニアに表示することができる。 このように、ゴミの量をリニアに表示することにより使用者に、今まで見えなかった集塵室内のゴミの状態を知らせることができ、今までのように、どのくらいたまっているのか分からないままゴミ捨てサインのみに頼ることが無くなり、ゴミを捨てる時期を使用者に任せることもでき、安心して使ってもらえることができる。
【００６１】
図９は本発明に係るもう一つの電気掃除機の一実施例の構成を示すブロック図、図１０は回転数が一定におけるゴミ量と電流との関係を示すグラフである。
図において、図１に示す構成と同一の構成は同一符号を付して重複した構成の説明を省略する。
２７は電流検出器で、この実施例ではその検出信号はマイクロコンピュータ７に入力される。２９は回転数検出手段で、その出力はＰＷＭ制御回路２４に入力される。５１は強（３００００ＲＰＭ）、中（２３０００ＲＰＭ）、弱（１４０００ＲＰＭ）の運転モードのそれぞれに対応したゴミ量とブラシレスモータ４の入力電流との相関関係を示すデータを記憶したデータターブル、５２は各運転モードにおける入力電流に対応したゴミ量のデータを出力するゴミ量判定手段、３５（表示せず図２参照）は電流値を基準値として記憶した吸い付き状態メモリ、５３はブラシレスモータ４の入力電流が変わらない状態が一定時間連続して続いたらモータ停止信号を出力するオートパワーオフ制御手段である。
【００６２】
この実施例の電気掃除機は、ブラシレスモータ４の回転数を回転検出手段であるホール素子２８で検出し、そのホール素子２８の検出した回転数を回転数検出手段２９で電圧に変換してＰＷＭ制御回路２４にフイードバック制御して回転数を一定に制御している。
この場合において、回転数を一定に保つと、風量が一定に保たれる。そして、風量Ｑと圧力Ｈと出力Ｐの間には Ｑ・Ｈ＝Ｐ という関係があり、出力Ｐはインバータ２６の入力である電圧Ｖ、電流Ｉの積と比例関係があるから、風量Ｑと電圧Ｖを一定とすると、圧力Ｈが変化した時、電流Ｉが変化することになる。従って、集塵室２の内部のゴミの量が多くなると空気の循環が妨げられて風量が小さくなり、集塵室２内の圧力が下がると、電圧Ｖを一定とすれば、電流Ｉも下がるという一定の関係がある。そして、このとき、集塵室２の内部の紙パック３の圧力に対応するゴミ量と入力電流の間にはほぼ一定の関係があることも知られている。
以下、回転数の一定制御の場合における電気掃除機の実施例について説明する。
【００６３】
実施例１１
まず、電気掃除機の各運転モードにおけるゴミ量と入力電流を実測したデータに基づいて作成した表３を下記に示す。
【００６４】
【表３】

【００６５】
図１０はゴミ量と入力電流の関係を示すグラフで、グラフ中の実線はゴミ量と入力電流を実測したデータの実測線であり、一点鎖線はゴミ量０％の時の入力電流とゴミ量１００％の入力電流を直線補間した線であり、ゴミ量と入力電流の間に一定の関係が成立している。そして、その直線補間した線に基づいて強、中、弱の運転モードのそれぞれに対応したゴミ量と入力電流との相関関係を示すデータを記憶したデータテーブル５１を作成しておく。
【００６６】
そこで、電気掃除機の掃除中に、電流検出器２７がブラシレスモータ４の入力電流を検出しており、ゴミ量判定手段５２が電流検出器２７が検出した検出信号の入力電流とデータテーブル５１の運転中における運転モードに対応した入力電流とを比較し、電流検出器２７の入力電流と一致するデータテーブル５１のそのときの運転モードにおける入力電流に対応したゴミ量のデータを出力する。そうすると、ゴミ量表示器８ｄは表示ゴミ量判定手段５２の出力信号によりゴミ量を複数のＬＥＤを使って紙パック３内のゴミ量の割合をそのまま表示している。このように各運転モードにおける集塵室２内のゴミ量を電流値より知ることができる。
【００６７】
実施例１２
上記複数の運転モードのそれぞれに対応したゴミ量と入力電流との相関関係を示すデータを記憶したデータテーブルは製品出荷時における所定の指定回転数のときのゴミの無い状態での電流地を基準に作成もしくは補正されていることにより、個々の電気掃除機毎に正確なゴミ量検知ができる。
【００６８】
実施例１３
この実施例は、オートパワーオフ制御手段５３が電流検出手段２７が検出した検出信号の入力電流を例えば０．２５ｓｅｃの時間間隔でサンプルホールドし、サンプルホールドした入力電流を前回のサンプルホールドした入力電流と比較し、その差の絶対値が例えば０．０５ｍＡとした所定値Ｘが以下か否かを見て入力電流が実質的に変わらない状態にあるかどうかを確認する。その入力電流が変わらない状態が例えば３分連続して続いたらＰＷＭ制御回路２４にモータ停止信号を出力する。そうすると、ＰＷＭ制御回路２４はモータ停止信号を受けてブラシレスモータ４を停止させるから、電源の切り忘れ等により電気掃除機を掃除状態で放置した場合には一定時間経過するとモータが自動的に停止させられ、安全であり、省エネルギーともなる。また、その入力電流が変わった状態のときは通常の運転を続行する。
【００６９】
実施例１４
この実施例はブラシレスモータ４が上述した実施例においてモータ停止信号により停止させられる場合に、ブラシレスモータ４を即座に止めることができるものである。
この実施例では、モータ逆転指令手段３９がＰＷＭ制御回路２４にモータ停止信号が出力されるとき、そのモータ停止信号に代わりＰＷＭ制御回路２４にモータ逆転指令信号を出力し、ＰＷＭ制御回路２４はモータ逆転指令信号を受けてブラシレスモータ４に逆転方向トルクを発生させ、逆転制動によって停止させるものである。このようにブラシレスモータ４を即座に止めるから、電気掃除機本体１の吸い込み口にカーテンや新聞紙等が吸い付いたときに、吸い付き物をより早く取り除くことができる。
【００７０】
この実施例も実施例１４と同様にブラシレスモータ４を即座に止めるためのものである。
この実施例では、モータ制動停止手段４０がＰＷＭ制御回路２４にモータ停止信号が出力されたとき、ＰＷＭ制御回路２４にインバータ２６の上段又は下段のスイッチング素子をオフさせる信号を出力し、ブラシレスモータ４を発電制動により停止させるものである。このようにブラシレスモータ４を即座に止めるから、電気掃除機本体１の吸い込み口にカーテンや新聞紙等が吸い付いたときに、吸い付き物をより早く取り除くことができる。
【００７１】
この実施例も実施例１４と同様にブラシレスモータ４を即座に止めるためのものである。
この実施例は、図１１に示すようにブラシレスモータ４とインバータ２６との間にブラシレスモータ４に発電制動を生じさせるよう動作する発電制動手段５５が設けられてなるものである。この発電制動手段５５はＰＷＭ制御回路２４に出力されるモータ停止信号を受けオン動作するホトカプラからなるスイッチ回路５６とスイッチ回路５６がオン動作したときブラシレスモータ４に発生する逆起電圧をショートさせて制動電流として流す６つのダイオードからなる発電制動回路５７とからなる。
【００７２】
そして、ＰＷＭ制御回路２４にモータ停止信号が出力されたとき、そのモータ停止信号により、発電制動手段５５のスイッチ回路５６がオン動作し、スイッチ回路５６のオン動作により発電制動回路５７がショートしてブラシレスモータ４に発生する逆起電圧によって制動電流が流れ、ブラシレスモータ４に発電制動がかかる。このようにブラシレスモータ４を即座に止めるから、電気掃除機本体１の吸い込み口にカーテンや新聞紙等が吸い付いたときに、吸い付き物をより早く取り除くことができる。
【００７３】
上述した実施例ではいずれも、ブラシレスモータを例にあげたが、その他のモータ（例えばユニバーサルモータ、２層モータ等）でも回転数信号を取り出せるものならば本発明を実施得ることはいうまでもない。
【００７４】
【発明の効果】
請求項１の効果
本発明におけるインバータに電圧を供給する母線の入力電流を検出し、その入力電流をＰＷＭ制御回路にフィードバック制御して入力電流を一定に制御する電気掃除機において、ゴミ量判定手段がブラシレスモータの回転数を検出する回転数検出手段が検出した検出信号の回転数と複数の運転モードのそれぞれに対応したゴミ量と回転数との相関関係を示すデータを記憶したデータテーブルの回転数とを比較し、回転数検出手段の回転数と一致するデータテーブルのそのときの運転モードにおける回転数に対応したゴミ量のデータを出力し、ゴミ量表示手段はゴミ量判定手段の出力信号によりゴミ量を表示するから、各運転モードにおける電気掃除機本体の集塵室内のゴミ量を回転数より知ることができ、従来のように圧力センサのコストが全くいらず、低コストでゴミ量を検知できるという効果を有する。
【００７５】
請求項２の効果
また、上記回転数検出手段としてホール素子が用いられているので、ブラシレスモータの回転数を簡単に低コストで検出することができる。
【００７６】
請求項３の効果
また、上記複数の運転モードのそれぞれに対応したゴミ量と回転数との相関関係を示すデータを記憶したデータテーブルは製品出荷時における所定の入力電流のときのゴミの無い状態での回転数を基準に作成もしくは補正することにより、個々の電気掃除機毎に正確なゴミ両検知ができるという効果を有する。
【００７７】
請求項４の効果
さらに、吸い付き状態判定手段が、ブラシレスモータの回転数を検出する回転数検出手段が検出した検出信号の回転数と複数の運転モードのそれぞれにおける吸い込み口が床面から接触していてゴミ詰まりの状態態を示す回転数と完全密封状態を示す回転数との間に位置する吸い込み口が床面から離れていて吸い付き状態を示す回転数を基準値として記憶した吸い付き状態記憶手段のそのときの運転モードにおける基準値とを比較し、回転数検出手段が検出した検出信号の回転数が吸い付き状態記憶手段の該基準値を越えたときに吸い付き状態を示す信号を出力し、教示手段が吸い付き状態判定手段の吸い付き状態を示す信号に基づき吸い付き状態を教示するから、電気掃除機本体の吸い込み口にカーテンや新聞紙等が吸い付いたときに生じるブラシレスモータの回転数が一気に上昇するというブラシレスモータの暴走を知らせることができるという効果を有する。
【００７８】
請求項５の効果
また、モータ停止手段が、吸い付き状態判定手段の吸い付き状態を示す信号に基づきブラシレスモータのインバータを駆動制御するＰＷＭ制御回路にモータ停止信号を出力し、ＰＷＭ制御回路はモータ停止信号を受けてモータを停止させるから、電気掃除機本体の吸い込み口にカーテンや新聞紙等が吸い付いたときに生じるブラシレスモータの暴走を回避でき、自動的にモータが保護され、また吸い付き物をとりのぞくことができる。
【００７９】
請求項６の効果
さらに、減速または停止・復帰指令手段が吸い付き状態判定手段の吸い付き状態を示す信号に基づきブラシレスモータのインバータを駆動制御するＰＷＭ制御回路に対してそのときの運転モードにおいて設定されたモータの回転数よりも相当低い回転数に減速するか、停止させる指令を出力し、それから吸い付き物を取り除ける所定時間経過後にモータの回転数をそのときの運転モードにおいて設定された回転数に復帰させる指令を出力し、ＰＷＭ制御回路は減速又は停止信号を受けてモータを減速させるか停止させ、それから、吸い付き物を取り除ける所定時間経過後にそのときの運転モードにおいて設定された回転数に復帰するから、モータに負担をかけること無く吸い付き物を取り除け、再び円滑に掃除状態に入ることができるという効果を有する。
【００８０】
請求項７の効果
そして、減速または停止・復帰指令手段の指令出力後に、電気掃除機本体の吸い込み口にカーテンや新聞紙等が吸い付いたときには停止指令手段が吸い付き状態判定手段が吸い付き状態を示す信号を出力した回数をカウントしてカウント値が所定回数を越えたら所定時間経過後にＰＷＭ制御回路にモータ停止信号を出力し、上記吸い付き状態が所定回数を超えたときにＰＷＭ制御回路は停止信号を受けてモータを停止させるから、密閉運転によるモータの発熱の危険が避けられるという効果を有する。
【００８１】
請求項８の効果
また、オートパワーオフ制御手段がブラシレスモータの回転数を検出する回転数検出手段が検出した検出信号の回転数を所定時間間隔でサンプルホールドし、サンプルホールドした回転数を前回のサンプルホールドした回転数と比較し、その差の絶対値が所定値Ｘ以下の場合に回転数が実質的に変わらない状態を確認し、その回転数が変わらない状態が一定時間連続して続いたらＰＷＭ制御回路にモータ停止信号を出力し、ＰＷＭ制御回路は停止信号を受けてブラシレスモータを停止させるから、圧力センサを使わずに電源の切り忘れ等により電気掃除機を掃除状態で放置した場合には一定時間経過するとブラシレスモータが自動的に停止させられ、安全であり、省エネルギーを実現できるという効果を有する。
【００８２】
請求項９の効果
また、電圧演算手段は、ブラシレスモータの回転数を検出する回転数検出手段が検出した検出信号の初期回転数Ｎ１及び現在回転数Ｎ２と直流電源の初期電圧Ｖ１とに基づき、
Ｖ２／Ｖ１・Ｋ＝Ｎ２／Ｎ１ という関係式から、直流電源の現在電圧Ｖ２を演算し、モータ停止判断手段は電圧演算手段が演算した現在電圧Ｖ２と予め設定された初期電圧Ｖ１より所定電圧だけ大きい上限値Ｖｕと初期電圧Ｖ１より所定電圧だけ小さい下限値Ｖｄとを比較し、電圧演算手段が演算した現在電圧Ｖ２が上記上限値Ｖｕ又は下限値Ｖｄを越えたときにＰＷＭ制御回路にモータ停止信号を出力し、ＰＷＭ制御回路はモータ停止信号によりブラシレスモータを停止させるから、電源電圧が上昇又は下降するという電圧変動の異常が有ったときにはブラシレスモータが停止させられ、電圧変動時の使用を避けることができるという効果を有する。
【００８３】
請求項１０の効果
さらに、補正回転数演算手段は回転数検出手段が検出した現在回転数Ｎ２と直流電源の初期電圧Ｖ１、電圧計測手段が計測した現在電圧Ｖ２に基づき、 Ｖ２／Ｖ１・Ｋ＝Ｎ２／Ｎｃ、 Ｎｃ＝Ｎ２・[１＋｛（Ｖ１／Ｖ２）−１｝・Ｋ] の式から補正回転数Ｎｃを演算するから、電圧変動があったとしてもその補正回転数Ｎｃを用いることにより、電圧変動に対応したデータテーブルを持つ必要が無いのでデータテーブル容量が少なくても正確なゴミ量検知や吸い付き状態検知が可能となるという効果を有する。
【００８４】
請求項１１の効果
さらにまた、ゴミ量演算手段は補正回転数演算手段が演算した補正回転数Ｎｃと、ゴミ量ゼロの時の初期回転数Ｎ１と、ゴミ量１００％のときの回転数上昇分Ｎ100とに基づき、ゴミ量（％）＝（Ｎｃ−Ｎ１）／Ｎ100×１００という関係式からゴミ量を演算し、ゴミ量表示手段がゴミ量演算手段の出力信号によりゴミ量を表示するから、正確なゴミ量をリニアに表示することができるという効果を有する。
【００８５】
請求項１２の効果
本発明におけるブラシレスモータの回転数を検出し、その回転数をモータプリドライブ回路にフィードバックすると共にその回転数を電圧に変換し、変換した電圧をＰＷＭ制御回路にフィードバックすることにより回転数を一定に制御する電気掃除機において、ゴミ量判定手段が、インバータに電圧を供給する母線の入力電流を検出する電流検出手段が検出した入力電流と複数の運転モードのそれぞれに対応したゴミ量と入力電流との相関関係を示すデータを記憶したデータテーブルのそのときの運転モードにおける入力電流に対応したゴミ量のデータを出力し、ゴミ量表示手段がゴミ量判定手段の出力信号によりゴミ量を表示するから、各運転モードのにおける電気掃除機本体の集塵室内のゴミ量を入力電流より知ることができ、従来のように圧力センサのコストが全くいらず低コストでゴミ量を検知できるという効果を有する。
また、オートパワーオフ制御手段がインバータに電圧を供給する母線の入力電流を検出する電流検出手段が検出した入力電流を所定時間間隔でサンプルホールドし、サンプルホールドした入力電流を前回のサンプルホールドした入力電流と比較し、その差の絶対値が所定値Ｘ以下の場合に入力電流が実質的に変わらない状態を確認し、その入力電流が実質的に変わらない状態が一定時間連続して続いたらＰＷＭ制御回路にモータ停止信号を出力し、ＰＷＭ制御回路はモータ停止信号を受けてブラシレスモータを停止させるから、電源の切り忘れ等により電気掃除機を掃除状態で放置した場合には一定時間経過するとブラシレスモータが自動的に停止させられ、安全であり、省エネルギーが実現できるという効果を有する。
【００８６】
請求項１３の効果
上記複数の運転モードのそれぞれに対応したゴミ量と入力電流との相関関係を示すデータを記憶したデータテーブルは製品出荷時における所定の回転数のときのゴミの無い状態での入力電流を基準に作成されていることのより、個々の電気掃除機毎に正確なゴミ量が検知できるという効果を有する。
【００８７】
請求項１４の効果
入力電流を一定に制御、または回転数を一定に制御する電気掃除機において、モータ逆転指令手段が、ブラシレスモータのインバータを駆動制御するＰＷＭ制御回路にモータ停止信号が出力されたとき、そのモータ停止信号に代わり、該ＰＷＭ制御回路にモータ逆転指令信号を出力し、ＰＷＭ制御回路はモータ逆転指令信号を受けてブラシレスモータに逆転方向トルクを発生させ、逆転制動によって停止させるから、電気掃除機本体の吸い込み口にカーテンや新聞紙等が吸い付いたときにブラシレスモータを速やかに停止させることができ、吸い付き物をより早く取り除くことができるという効果を有する。
【００８８】
請求項１５の効果
また、モータ制動指令手段が、上記ＰＷＭ制御回路にモータ停止信号が出力されたとき、ＰＷＭ制御回路に上記インバータの上段又は下段のスイッチング素子をオフさせる信号を出力し、上記ブラシレスモータを発電制動により停止させるから、電気掃除機本体の吸い込み口カーテンや新聞紙等が吸い付いたときにブラシレスモータを速やかに停止させることができ、吸い付き物をより早く取り除くことができるという効果を有する。
【００８９】
請求項１６の効果
さらに、発電制動手段が、上記ＰＷＭ制御回路にモータ停止信号が出力されたとき、上記ブラシレスモータと上記インバータとの間に設けられ、上記モータ停止信号に基づき、該ブラシレスモータに発電制動を生じさせるよう動作してブラシレスモータに発電制動をかけるから、電気掃除機本体の吸い込み口カーテンや新聞紙等が吸い付いたときにブラシレスモータを速やかに停止させることができ、吸い付き物をより早く取り除くことができるという効果を有する。
【図面の簡単な説明】
【図１】本発明に係る電気掃除機の一実施例の構成を示すブロック図である。
【図２】同実施例の制御部の構成を示すブロック図である。
【図３】同実施例の概略構成を示す断面図である。
【図４】ＡＣ電源変動における風量と回転数との関係を示すグラフである。
【図５】ゴミ量と回転数の関係を示すグラフである。
【図６】ゴミ量の表示例を示す説明図である。
【図７】吸い付き状態を検知した時に所定時間経過後に電源をオフさせるフローチャートである。
【図８】モータの回転数が変わらない状態が一定時間連続して続いたらモータを停止させるフローチャートである。
【図９】本発明に係るもう一つの電気掃除機の一実施例の構成を示すブロック図である。
【図１０】回転数が一定におけるゴミ量と電流との関係を示すグラフである。
【図１１】発電制動手段の構成を示す回路図である。
【符号の説明】
４ ブラシレスモータ
８ｄ ゴミ量表示器（ゴミ量表示手段）
７ マイクロコンピュータ
２０ 整流回路（直流電源）
２１ 分圧器（直流電源）
２４ ＰＷＭ制御回路
２５ モータプリドライブ回路
２６ インバータ
２７ 電流検出器
２８ ホール素子（回転位置検出手段もしくは回転検出手段）[0001]
[Industrial application fields]
The present invention relates to a vacuum cleaner that uses the ease of rotation speed detection, which is a feature of a brushless motor, and has a dust amount detection function, a suction prevention function, and an auto power-off function without using a pressure sensor. .
[0002]
[Prior art]
The conventional air conditioner filter clogging detection apparatus disclosed in Japanese Patent Application Laid-Open No. 63-156967 is clogged as a clogged state of an indoor air filter whose current flowing through a blower motor exceeds a certain value. This state is detected and displayed to the user, and the rotation speed is adjusted to be constant by current control.
[0003]
The conventional vacuum cleaner disclosed in Japanese Patent Laid-Open No. 2-164325 includes a cleaning operation control unit on the cleaner body and a function display unit that displays a plurality of functions in the cleaning operation state. It has an exhibition operation mode to operate the function display unit, for example, the dust amount display unit of the function display unit corresponds to the output of the semiconductor pressure sensor that detects the pressure change in the space with the intake filter on the intake side of the electric blower Digital display is performed step by step on three display bodies, and the replacement time is notified by a buzzer when the paper bag filter is replaced.
[0004]
Another conventional vacuum cleaner disclosed in Japanese Patent Laid-Open No. 63-234930 detects the load current of a brushless motor, determines the operating state from the magnitude of the current, and in particular, has a predetermined value with a load current. When it becomes below, the rotation speed is controlled to be constant to prevent over-rotation.
[0005]
[Problems to be solved by the invention]
A conventional filter clogging detection device for an air conditioner detects a clogged state as a clogged state of an indoor air filter in which the current flowing through the fan motor is greater than a certain value, but the rotation speed is constant. There is a problem that a subtle change in clogging cannot be detected.
[0006]
In addition, for example, a dust amount display unit of the function display unit of the conventional vacuum cleaner displays three amounts according to the output of the semiconductor pressure sensor that detects the pressure change in the space with the intake filter on the intake side of the electric blower. Although the digital display is performed step by step by the body, there is a problem that the display of the amount of dust is three and the cost of the pressure sensor is inevitably necessary and expensive.
[0007]
Furthermore, another conventional vacuum cleaner detects the load current of the brushless motor, determines the operating state from the magnitude of the current, and keeps the rotational speed constant when the load current falls below a predetermined value. Although control is performed to prevent over-rotation, there is a problem in that it is difficult to accurately determine clogging because the rotational speed is not specified as being constant. The present invention has been made to solve such a problem, and can detect not only clogging but also the amount of dust accurately and linearly. Moreover, as in the past, the amount of dust detection function, anti-sticking function, auto An object of the present invention is to obtain a vacuum cleaner capable of reducing the cost without using a pressure sensor even if it has a power-off function.
[0008]
[Means for Solving the Problems]
  The vacuum cleaner according to the present invention includes a brushless motor mounted on a main body of the vacuum cleaner, a DC power source that outputs a constant voltage, an input side connected to the DC power source, an output side connected to the brushless motor, and two switching elements. A plurality of parallel-connected inverters, a motor pre-drive circuit that drives the switching element of the inverter with a PWM signal, and a PWM control circuit that creates a PWM signal to be output to the motor pre-drive circuit based on a plurality of commanded operation modes In a vacuum cleaner that detects the input current of the bus that supplies voltage to the inverter and feeds back the input current to the PWM control circuit to control the input current constant, the rotational speed of the brushless motor is detected. Rotation speed detection means, and the amount and rotation of dust corresponding to each of a plurality of operation modes The data table storing the data indicating the correlation between the rotational speed of the detection signal detected by the rotational speed detection means and the rotational speed of the data table are compared, and the detection signal detected by the rotational speed detection means Dust determination means for outputting dust amount data corresponding to the rotation speed in the current operation mode of the data table corresponding to the rotation speed, and a dust amount display means for displaying the dust amount by an output signal of the dust amount determination means Is provided.The rotation speed detecting means is a Hall element.
[0009]
In addition, the data table storing the data indicating the correlation between the amount of dust and the rotational speed corresponding to each of the plurality of operation modes described above indicates the rotational speed in a dust-free state at a predetermined input current at the time of product shipment. Created to standards.
[0010]
  Furthermore, in each of several operation modesThe inlet is in contact with the floorLocated between the number of revolutions indicating the state of clogging and the number of revolutions indicating a completely sealed stateThe inlet is away from the floorThe suction state storage means that stores the rotation number indicating the suction state as a reference value, the rotation number of the detection signal detected by the rotation number detection means, and the reference value in the current operation mode of the suction state storage means, And a sucking state determination unit that outputs a signal indicating a sucking state when the rotation number of the detection signal detected by the rotation number detecting unit exceeds the reference value of the sucking state storage unit, Teaching means for teaching the suction state based on the signal output from the suction state determination means.
[0011]
  In addition, the sticking state determination meansRotational speed detection meansThe number of rotations of the detection signal detected bythe aboveCompare the reference value in the current operation mode of the suction state storage means,Rotational speed detection meansThe number of rotations of the detection signal detected byThe sticking state storage meansBased on the signal indicating the sticking state that is output when the reference value is exceeded,The PWM control circuit is provided with motor stop means for outputting a motor stop signal.
[0012]
  In addition, the sticking state determination meansRotational speed detection meansThe number of rotations of the detection signal detected bythe aboveCompare with the reference value in the current operation mode of the suction state storage means,Rotational speed detection meansThe number of rotations of the detection signal detected byThe sticking state storage meansBased on the signal indicating the sticking state that is output when the reference value is exceeded, the PWM control circuit is set in the current operation mode.Motor rotation speedCommand to decelerate or stop at a much lower speed than theMotor rotation speedIs provided with deceleration or stop / return command means for outputting a command for returning the engine speed to the rotational speed set in the operation mode at that time.
[0013]
  Further, the sticking state determination meansRotational speed detection meansThe number of rotations of the detection signal detected bythe aboveCompare with the reference value in the current operation mode of the suction state storage means,Rotational speed detection meansThe number of rotations of the detection signal detected byThe sticking state storage meansBased on the signal indicating the sticking state that is output when the reference value is exceeded, the PWM control circuit is set in the current operation mode.Motor rotation speedCommand to decelerate or stop at a much lower speed than theMotor rotation speedA deceleration or stop / return command means for outputting a command for returning the motor to the rotational speed set in the operation mode at that time,TheAfter command output of deceleration or stop / return command meansthe aboveA stop command means for outputting a motor stop signal to the PWM control circuit after a lapse of a predetermined time when the sticking state determination means counts the number of times the signal indicating the sticking state is output and the count value exceeds a predetermined number of times. Become.
[0014]
  Also,Rotational speed detection meansWhen the number of rotations of the detection signal detected is sampled and held at a predetermined time interval, and the sampled and held number of rotations is compared with the number of rotations of the previous sample and hold, and the absolute value of the difference is less than or equal to the predetermined value XInAuto power-off control means for confirming a state in which the rotational speed is not substantially changed and outputting a motor stop signal to the PWM control circuit when the rotational speed is not substantially changed continuously for a predetermined time. It becomes.
  further,Rotational speed detection meansThe initial rotation speed N1 and the current rotation speed N2 of the detection signal detected by thethe aboveBased on the initial voltage V1 of the DC power supply, from the relational expression V2 / V1 · K = N2 / N1,the aboveDC power supplyCurrent voltage V2Voltage calculating means for calculatingTheCalculated by voltage calculation meansCurrent voltage V2And an upper limit value Vu that is larger than the preset initial voltage V1 by a predetermined voltage and a lower limit value Vd that is smaller than the initial voltage V1 by a predetermined voltage,the aboveCalculated by voltage calculation meansCurrent voltage V2Comprises motor stop means for outputting a motor stop signal to the PWM control circuit when the upper limit value Vu or the lower limit value Vd is exceeded.
[0015]
  further,the aboveVoltage measuring means for measuring the current voltage V2 of the DC power supply;Rotational speed detection meansThe current rotation speed N2 detected bythe aboveThe initial voltage V1 of the DC power supply, the corrected rotation speed Nc at that time,the aboveBetween the current voltage V2 measured by the voltage measuring means and V2 / V1 · K = N2 / Nc, Nc = N2 · [1 + {(V1 / V2) −1} · K] And a correction rotation number calculating means for calculating.
[0016]
  further,the aboveVoltage measuring means for measuring the current voltage V2 of the DC power supply;Rotational speed detection meansThe current rotation speed N2 detected bythe aboveBetween the initial voltage V1 of the DC power source, the corrected rotation speed Nc at that time, and the current voltage V2 measured by the voltage measuring means, V2 / V1 · K = N2 / Nc, Nc = N2 · [1 + {(V1 / V2 ) -1} · K], the corrected rotation speed calculating means for calculating the corrected rotation speed Nc;TheBased on the corrected rotational speed Nc calculated by the corrected rotational speed calculating means, the initial rotational speed N1 when the dust amount is zero, and the rotational speed increase N100 when the dust amount is 100%, the dust amount (%) = (Nc -N1) / N100 × 100 The amount of dust calculating means for calculating the amount of dust from the relational expression;TheAnd a dust amount display means for displaying a dust amount by an output signal of the dust amount calculation means.
[0017]
  In addition, a brushless motor mounted on the main body of the vacuum cleaner, a DC power source that outputs a constant voltage, an input side connected to the DC power source, an output side connected to the brushless motor, and two pairs of switching elements connected in parallel A motor pre-drive circuit that drives the switching element of the inverter with a PWM signal, a PWM control circuit that creates a PWM signal to be output to the motor pre-drive circuit based on a plurality of commanded operation modes, and a plurality of operation modes It consists of a command control unit that commands the PWM circuit, and from the rotor position signal from the rotor position detection meansMotor rotation speedIn the vacuum cleaner that controls the rotation speed constant by feeding back the signal of the rotation speed detection means for detecting the noise to the PWM control circuit,the aboveA current detection means for detecting an input current of a bus for supplying a voltage to the inverter, a data table storing data indicating a correlation between an amount of dust and an input current corresponding to each of a plurality of operation modes,the aboveDetected by current detection meansInput currentAnd the data tableInput currentAnd compareCurrent detection meansDetectedInput currentA dust amount determination means for outputting dust amount data corresponding to the input current in the current operation mode of the data table corresponding toTheThe amount of dust is displayed by the output signal of the dust amount judging means.The input current detected by the dust amount display means and the current detection means is sampled and held at a predetermined time interval, the sampled and held input current is compared with the previous sampled and held input current, and the absolute value of the difference is a predetermined value X Auto power-off control that confirms that the input current does not change substantially in the following cases, and outputs a motor stop signal to the PWM control circuit when the input current does not change substantially for a certain period of time Means andIt is equipped with.
[0018]
  Furthermore, the data table storing the data indicating the correlation between the amount of dust and the input current corresponding to each of the plurality of operation modes described above shows the input current in a dust-free state at a predetermined rotation speed at the time of product shipment. Created to standards.
[0019]
  In addition, a motor stop signal is output to the PWM control circuit.TheWhen, instead of the motor stop signal,TheOutput motor reverse rotation command signal to PWM control circuit,Above brushless motorIs provided with motor reverse rotation command means for stopping the motor by reverse braking.
  Furthermore, when a motor stop signal is output to the PWM control circuit, a signal for turning off the upper or lower switching element of the inverter is output to the PWM control circuit,Above brushless motorMotor stopping means for stopping the motor by power generation braking.
  In addition, a motor stop signal is output to the PWM control circuit.TheWhenThe brushless motor and the aboveBased on the motor stop signal provided between the inverter and the inverter,Brushless motorAnd a power generation braking means that operates to generate power generation braking.
[0020]
[Action]
  The vacuum cleaner according to the present invention is a vacuum cleaner that detects an input current of a bus that supplies a voltage to an inverter and feedback-controls the input current to a PWM control circuit to control the input current to be constant. Rotation of a data table storing data indicating the correlation between the rotation speed of the detection signal detected by the rotation speed detection means for detecting the rotation speed of the brushless motor and the amount of dust corresponding to each of the plurality of operation modes and the rotation speed The dust amount data corresponding to the number of revolutions in the current operation mode of the data table that matches the number of revolutions of the revolution number detection means, and the dust amount display means outputs an output signal of the dust amount judgment means Since the amount of dust is displayed, the amount of dust in the dust collection chamber of the vacuum cleaner body in each operation mode can be known from the rotation speed. This data table shows the correlation between the amount of dust and the number of rotations because constant current control is performed.If the amount of dust in the dust collection chamber increases, the air circulation deteriorates and the pressure in the dust collection chamber decreases. The output of the vacuum cleaner blower tends to decrease, but the motor speed increases (naturally the load is lighter) to maintain the blower output for constant input control, and in this case the dust collection chamber This is because the relationship between the amount of dust, that is, the pressure and the rotational speed, is substantially constant, and the dust amount, that is, the rotational speed with respect to the pressure in the relationship is measured and created.A Hall element is used as the rotation speed detection means.
[0021]
In addition, a data table storing data indicating the correlation between the amount of dust and the rotational speed corresponding to each of the plurality of operation modes is used to calculate the rotational speed in a dust-free state at a predetermined input current at the time of product shipment. By correcting to the standard, it is possible to accurately detect the amount of dust for each individual vacuum cleaner.
[0022]
  Further, the suction state determining means detects the rotation speed of the detection signal detected by the rotation speed detection means that detects the rotation speed of the brushless motor and each of the plurality of operation modes.The inlet is in contact with the floorLocated between the number of revolutions indicating the state of clogging and the number of revolutions indicating a completely sealed stateThe inlet is away from the floorCompared with the reference value in the current operation mode of the suction state storage means that stores the rotation number indicating the suction state as a reference value, the rotation number of the detection signal detected by the rotation number detection means is the value of the suction state storage means. When the reference value is exceeded, a signal indicating the suction state is output, and the teaching means teaches the suction state based on the signal indicating the suction state of the suction state determination means. It is possible to notify the runaway of the brushless motor that the number of rotations of the brushless motor that occurs when a curtain, newspaper, or the like sticks to the screen.
[0023]
Further, the motor stop means outputs a motor stop signal to the PWM control circuit that drives and controls the inverter of the brushless motor based on the signal indicating the sticking state of the sticking state determination means, and the PWM control circuit receives the motor stop signal. Since the motor is stopped, it is possible to avoid the runaway of the brushless motor that occurs when a curtain, newspaper or the like is sucked into the suction port of the main body of the vacuum cleaner, and the motor is automatically protected and the sticking matter can be removed.
[0024]
Furthermore, the motor set in the current operation mode is applied to the PWM control circuit that drives and controls the inverter of the brushless motor based on the signal indicating the sucking state of the sucking state determination means by the deceleration or stop / return command means. A command to decelerate or stop at a rotational speed considerably lower than the rotational speed, and to return the rotational speed of the motor to the rotational speed set in the current operation mode after a lapse of a predetermined time from which the sticking material is removed. The PWM control circuit decelerates or stops the motor in response to the deceleration or stop signal, and then returns to the rotational speed set in the current operation mode after the elapse of a predetermined time for removing the sticking object. The sticky things can be removed without putting a burden, and the cleaning state can be smoothly entered again.
[0025]
After the command output of the deceleration or stop / return command means, when a curtain or newspaper is sucked into the suction port of the main body of the vacuum cleaner, the stop command means outputs a signal indicating the sucking state by the sucking state determination means When the count value exceeds the predetermined number, the motor stop signal is output to the PWM control circuit after the predetermined time has elapsed, and when the sticking state exceeds the predetermined number, the PWM control circuit receives the stop signal and the motor Since the motor is stopped, the danger of heat generation of the motor due to hermetic operation is avoided.
[0026]
  The auto power off control means detects the rotation speed of the brushless motor.Rotation speed detection meansWhen the number of rotations of the detection signal detected is sampled and held at a predetermined time interval, the sampled and held number of rotations is compared with the number of rotations of the previous sample and hold, and the absolute value of the difference is less than or equal to the predetermined value XInRotational speed is substantialInCheck the state that does not change,When the state where the rotation speed does not change continues for a certain period of time, a motor stop signal is output to the PWM control circuit, and the PWM control circuit receives the stop signal.Brushless motorIf you leave the vacuum cleaner in a cleaning state due to forgetting to turn off the power, etc.Brushless motorIs automatically stopped, safe and energy saving.
[0027]
  The voltage calculation means detects the rotation speed of the brushless motor.Rotation speed detection meansBased on the initial rotational speed N1 and the current rotational speed N2 of the detection signal detected by, and the initial voltage V1 of the DC power supply,
  From the relational expression V2 / V1 · K = N2 / N1,Current voltage V2The motor stop determination means is calculated by the voltage calculation means.Current voltage V2And the upper limit value Vu that is larger than the preset initial voltage V1 by a predetermined voltage and the lower limit value Vd that is smaller than the initial voltage V1 by a predetermined voltage,Current voltage V2When the voltage exceeds the upper limit value Vu or the lower limit value Vd, a motor stop signal is output to the PWM control circuit, and the PWM control circuit stops the brushless motor by the motor stop signal, so that the power supply voltage increases or decreases. When there was an abnormalityBrushless motorIs stopped.
[0028]
  Further, the corrected rotation speed calculation means isRotation speed detection meansV2 / V1 · K = N2 / Nc, Nc = N2 · [1 + {(V1 / V2) −, based on the current rotation speed N2 detected by the power source, the initial voltage V1 of the DC power supply, and the current voltage V2 measured by the voltage measuring means. Since the corrected rotational speed Nc is calculated from the equation 1} · K], even if there is a voltage fluctuation, the correct rotational speed Nc can be detected by using the corrected rotational speed Nc.
[0029]
Furthermore, the dust amount calculation means is the corrected rotation speed Nc calculated by the correction rotation speed calculation means, the initial rotation speed N1, the initial rotation speed N1 when the dust amount is zero, and the rotation speed increase when the dust amount is 100%. Based on the minute N100, the dust amount is calculated from the relational expression of dust amount (%) = (Nc−N1) / N100 × 100, and the dust amount display display means displays the dust amount by the output signal of the dust amount calculation means. Therefore, even if there is a voltage fluctuation, the correct amount of dust can be displayed linearly by using the corrected rotation speed Nc.
[0030]
  In addition, the rotational speed of the brushless motor is detected, the rotational speed is fed back to the motor pre-drive circuit, the rotational speed is converted to voltage, and the converted voltage is fed back to the PWM control circuit to control the rotational speed to be constant. In the vacuum cleaner, the dust amount determination means is configured to calculate the input current detected by the current detection means for detecting the input current of the bus that supplies the voltage to the inverter, the dust amount corresponding to each of the plurality of operation modes, and the input current. Output the amount of dust corresponding to the input current in the current operation mode of the data table storing the data indicating the correlation,Garbage amount display meansHowever, since the amount of dust is displayed by the output signal of the dust amount determination means, the amount of dust in the dust collection chamber of the vacuum cleaner body in each operation mode can be known from the input current. This data table shows the correlation between the amount of dust and the input current because constant rotation speed control is performed.If the amount of dust in the dust collection chamber increases, the circulation of air deteriorates and the pressure in the dust chamber increases. Decreases, the load on the motor becomes lighter, and the current value of the input current decreases. In this case, there is a substantially constant relationship between the amount of dust in the dust collection chamber, that is, the pressure, and the input current, and the input current data with respect to the amount of dust in the relationship, that is, the pressure is measured and created.
  The auto power off control means samples and holds the input current detected by the current detection means for detecting the input current of the bus that supplies the voltage to the inverter at a predetermined time interval, and the input that has been sampled and held the previous sample hold Compared with the current, if the absolute value of the difference is less than or equal to the predetermined value X, the state where the input current is substantially unchanged is confirmed, and if the state where the input current does not substantially change continues for a certain time, PWM Output motor stop signal to control circuit
Since the PWM control circuit receives the motor stop signal and stops the brushless motor, if the vacuum cleaner is left in a cleaning state due to forgetting to turn off the power, the brushless motor is automatically stopped after a certain period of time, It is safe and energy saving.
[0031]
A data table storing data indicating the correlation between the amount of dust and the input current corresponding to each of the plurality of operation modes is based on the input current in a dust-free state at a predetermined rotation speed at the time of product shipment. By creating or correcting, it is possible to accurately detect the amount of dust for each individual vacuum cleaner.
[0033]
Further, when a motor stop signal is output to the PWM control circuit that drives and controls the inverter of the brushless motor, the motor reverse rotation command means outputs the motor reverse rotation command signal to the PWM control circuit instead of the motor stop signal, and the PWM control circuit Receives the motor reverse command signal, applies reverse torque and stops by reverse braking, so the motor can be stopped quickly when a curtain or newspaper is sucked into the suction port of the vacuum cleaner body. Accompanying can be removed more quickly.
[0034]
When the motor braking command means outputs a motor stop signal to the PWM control circuit, it outputs a signal for turning off the upper or lower switching element of the inverter to the PWM control circuit, and stops the motor by dynamic braking. Thus, when a curtain, newspaper or the like is sucked into the suction port of the main body of the vacuum cleaner, the motor can be stopped quickly, and the sticking material can be removed more quickly.
[0035]
The power generation braking means is provided between the motor and the inverter when a motor stop signal is output to the PWM control circuit, and operates to cause the motor to generate power braking based on the motor stop signal. Since power generation braking is applied to the motor, the motor can be quickly stopped when a curtain, newspaper, or the like is sucked into the suction port of the main body of the vacuum cleaner, and the sticking material can be removed more quickly.
[0036]
【Example】
1 is a block diagram showing a configuration of an embodiment of a vacuum cleaner according to the present invention, FIG. 2 is a block diagram showing a configuration of a control unit of the embodiment, and FIG. 3 is a cross-sectional view showing a schematic configuration of the embodiment. FIG. 4, FIG. 4 is a graph showing the relationship between the air volume and the rotational speed in the AC power fluctuation, FIG. 5 is a graph showing the relation between the dust volume and the rotational speed, and FIG. In FIG. 3, 1 is a vacuum cleaner body, 2 is a dust collection chamber formed in the vacuum cleaner body 1, 3 is a paper pack provided in the dust collection chamber 2, and 4 is an interior of the vacuum cleaner body 1. The brushless motor constituting the blower disposed in the vacuum cleaner 5 is attached to the brushless motor drive control board body 5 with a microcomputer provided on the upper portion of the electric vacuum cleaner body 1, and 6 is attached to the brushless motor drive control board body 5 with a microcomputer. , A heat radiating plate located between the dust collection chamber 2 and the brushless motor 4, 7 is a microcomputer mounted on the brushless motor drive control board body 5 with a microcomputer, and 8 is provided on the mounting board body 5 with a microcomputer, The display unit 9 exposed to the outside connects the microcomputer 7 to a hall element, which is a rotation detection means (to be described later) provided in the brushless motor 4. Number signal line, 10 is a power cord, 11 is a rear wheel of the vacuum cleaner body 1, 12 is a front wheel of the vacuum cleaner body 1, 13 is a hose connected to the dust collecting chamber 2, and 14 is a tip of the hose 13. It is a brush attached to.
[0037]
In FIGS. 1 and 2, reference numeral 20 denotes a rectifier circuit that rectifies an AC power source into direct current, 21 denotes a voltage divider that divides the direct current of the rectifier circuit 20, and the voltage of the voltage divider 21 is input to the microcomputer 7. The microcomputer 7 is connected to the display unit 8 via the interface 25. The display unit 8 includes a rotation mode indicator 8a, a sucking state indicator 8b, an auto power off indicator 8c, a dust amount indicator 8d, and the like. 23 is an operation command section provided at the base of the brush 14, 24 is a PWM control circuit connected to the microcomputer 7 via an interface 25, 25 is a motor pre-drive circuit connected to the PWM control circuit 24, and 26 is a motor This is an inverter connected to the pre-drive circuit 25. Reference numeral 27 denotes a current detector that detects an input current of a bus that supplies a voltage to the inverter 26, and reference numeral 28 denotes a hall element that is a rotor position detecting means and a rotational speed detecting means for detecting the rotor position and rotational speed of the brushless motor 4. .
[0038]
30 is the main CPU of the microcomputer 7, 31 is a ROM for storing programs, 32 is a working RAM, 33 is compatible with each of the strong (12A mode), medium (6A mode), and weak (2A mode) operation modes. Is a data table storing data indicating the correlation between the amount of dust and the rotation speed of the brushless motor 4, 34 is a dust amount determination means for outputting dust amount data corresponding to the rotation speed in each operation mode, and 35 is a suction The sucking state memory 36 stores the rotation number indicating the state as a reference value, and outputs a signal indicating the sticking state when the rotation number of the detection signal of the Hall element 28 exceeds the reference value of the sucking state memory 35. Sucking state determination means 37 outputs a motor stop signal when the state in which the rotation speed of the brushless motor 4 does not change continues for a certain period of time. Topawaofu is a control means.
[0039]
38 is a motor stop means for outputting a signal for turning off the upper or lower switching element of the inverter 26 to stop the brushless motor 4 by dynamic braking, 39 is a motor reverse instruction means for outputting a motor reverse instruction signal, and 40 is a brushless motor. 4 is a motor braking command means for operating the power generation braking provided between the inverter 26 and the inverter 26. When the brushless motor 4 has a rotational speed indicating a sticking state, the motor is decelerated or stopped for a predetermined time. Deceleration or stop / return command means 42 for returning the brushless motor 4 to the rotational speed in the operation mode at that time, 42 indicates a sucking state determination means 36 after the command output of the deceleration or stop / return command means 41 The number of times the signal is output is counted, and when the count value exceeds the specified number, A stop command means for outputting a.
[0040]
43 is a voltage calculation means for calculating the current voltage applied to the inverter 26, and 44 is a motor that outputs a motor stop signal when the current voltage calculated by the voltage calculation means 42 exceeds a preset upper limit value or lower limit value. A stop determination circuit 45 is a correction rotation speed calculation means for correcting the current rotation speed at the current voltage applied to the inverter 26 to a correction rotation speed corresponding to the initial voltage, and 46 is a correction rotation speed calculation means 45. The dust amount calculating means calculates the dust amount based on the corrected rotation speed Nc, the initial rotation speed N1 when the dust amount is zero, and the rotation speed increase N100 when the dust amount is 100%. Reference numeral 47 denotes voltage measuring means for measuring the current voltage applied to the inverter 26.
[0041]
FIG. 4 is a graph showing the relationship between the air flow rate and the rotation speed in the AC power fluctuation, and the relationship between the air flow rate and the rotation speed when the AC power supplied to the rectifier circuit 20 is AC 100 V in a certain operation mode is shown by a reference curve. It can be seen that when there is no dust and the air volume is maximum, the rotational speed is low, but when dust clogging gradually occurs, the rotational speed gradually increases. This is because the input current of the bus that supplies the voltage to the inverter 26 is detected by the current detector 27, and the detected current of the current detector 27 is fed back to the PWM control circuit 24 to control the input current to be constant. In this case, if the amount of dust inside the dust collection chamber 2 increases, the circulation of air is hindered and the air volume decreases, and the pressure in the dust collection chamber 2 decreases and the motor load decreases, so the motor speed increases. is there. At this time, it is also known that there is a substantially constant relationship between the amount of dust corresponding to the pressure of the paper pack 3 inside the dust collecting chamber 2 and the rotational speed.
Also, assuming that the relationship between the air volume and the rotational speed when the AC power supply is AC 100V is the reference curve, the rotational speed increases at a constant rate from the reference curve in the case of + αV, and conversely at a constant rate in the case of −αV. The number shows a decrease. Therefore, as described later, when the control is performed based on the rotational speed, it is necessary to correct the voltage fluctuation of the AC power supply.
Hereinafter, the Example of the vacuum cleaner in the case of a constant control of input current is described.
[0042]
Example 1
First, Table 1 created based on data obtained by actually measuring the amount of dust and the number of rotations in each operation mode of the vacuum cleaner is shown below.
[0043]
[Table 1]

[0044]
FIG. 5 is a graph showing the relationship between the amount of dust and the number of revolutions. The solid line in the graph is an actual measurement line of data obtained by actually measuring the amount of dust and the number of revolutions. This is a line obtained by linearly interpolating the number, and a certain relationship is established between the amount of dust and the rotational speed. Then, a data table 33 storing data indicating the correlation between the amount of dust and the rotational speed corresponding to each of the strong, medium, and weak operation modes is created based on the linearly interpolated lines.
[0045]
Therefore, during cleaning of the electric vacuum cleaner, the hall element 28 serving as the revolution number detection means detects the revolution number of the brushless motor 4, and the dust amount judgment means 34 detects the revolution number of the detection signal detected by the hall element 28 and the data table. The number of rotations corresponding to the operation mode during operation 33 is compared, and the amount of dust data corresponding to the number of rotations in the current operation mode of the data table that matches the number of rotations of the Hall element 28 is output. Then, the dust amount indicator 8d displays the dust amount ratio in the paper pack 3 as it is as shown in FIG. Can know the amount of dust in the dust collecting chamber 2 in each operation mode from the rotational speed.
[0046]
Example 2
The data table 33 storing data indicating the correlation between the amount of dust and the rotational speed corresponding to each of the above three operation modes is the rotational speed in a dust-free state at a predetermined input current at the time of product shipment. By making or correcting with reference to the above, it is possible to accurately detect the amount of dust for each individual vacuum cleaner.
[0047]
Example 3
During the cleaning of the electric vacuum cleaner, the hall element 28 serving as the rotation speed detection means detects the rotation speed of the brushless motor 4, and the suction state determination means 36 detects the rotation speed of the detection signal detected by the hall element 28. The reference value in the operation mode at that time of the attached state storage memory 35 is compared, and a signal indicating the attached state is detected when the number of rotations of the detection signal of the Hall element 28 exceeds the reference value of the attached state storage memory 35. Output. Then, the sticking state indicator 8b composed of LEDs as teaching means teaches the sticking state by lighting or blinking the sticking state based on the signal indicating the sticking state of the sticking state determination means 36. Can notify the runaway of the brushless motor 4 that the rotational speed of the brushless motor 4 that is generated when a curtain, newspaper, or the like is sucked into the suction port of the vacuum cleaner main body 1 increases at a stretch. This is because when a curtain or newspaper is sucked into the suction port of the vacuum cleaner main body 1, the motor load is drastically reduced, the number of rotations increases at a stretch, and the motor shaft and bearing are burdened, and the air circulation This is to prevent the motor temperature from rising and the life of the brushless motor 4 from being shortened.
Moreover, the person who knows this will return to a normal driving | operation by removing a curtain, a newspaper, etc. from the suction inlet of the vacuum cleaner main body 1. FIG. In this embodiment, the sucking state indicator 8b made of LEDs is used as the teaching means, but it goes without saying that a buzzer that emits a warning sound may be used.
[0048]
Example 4
In this embodiment, the motor stop means 38 outputs a motor stop signal to the PWM control circuit 24 based on the signal indicating the suction state of the suction state determination means 36. Since the PWM control circuit 24 receives the motor stop signal and stops the motor, the runaway of the brushless motor 4 that occurs when a curtain, newspaper, or the like sticks to the suction port of the vacuum cleaner main body 1 can be avoided. The brushless motor 4 is protected. In addition, the sticking object can be easily removed when it is naturally separated from the suction port or removed by hand.
[0049]
Example 5
FIG. 7 is a flowchart for turning off the power after a lapse of a predetermined time when the sticking state is detected. The operation of the embodiment will be described based on this flowchart.
In this embodiment, first, it is determined whether or not the suction state determination means 36 is in the suction state during cleaning of the electric vacuum cleaner (S1). If not, the timer is stopped and reset (S2), and normal operation is started (S3). Further, if it is in the sucking state, the brushless set in the operation mode at that time with respect to the PWM control circuit 24 based on the signal indicating the sucking state of the sucking state determination means 36 by the deceleration / stop / return command means 41. A sucking process for decelerating the brushless motor 4 to a speed that is considerably lower than the speed of the motor 4 or outputting a command to stop the motor 4 or stopping the brushless motor 4 is performed (S4).
[0050]
Then, a timer is started (S5), for example, whether or not a predetermined time of 5 to 20 seconds that can remove the sticking material has elapsed (S6), and when the predetermined time has elapsed, the number of rotations of the motor is set in the operation mode at that time. A command for returning to the set number of revolutions is output to the PWM control circuit 24, and the number of revolutions of the brushless motor 4 is restored to the number of revolutions set in the initial operation mode (S7). Therefore, it is possible to remove the sticking matter without imposing a burden on the brushless motor 4 and smoothly enter the cleaning state again.
[0051]
Example 6
In this embodiment, after the command output from the deceleration or stop / return command means 41, the rotation speed of the brushless motor 4 returns to the rotation speed set in the original operation mode. When a curtain, newspaper, or the like sticks to the suction port 1, the operation of the fifth embodiment is repeated. Such an operation is repeated forever. Therefore, when the stop command means 42 counts the number of times the sucking state determination means 36 outputs a signal indicating the sucking state, and the count value exceeds, for example, 30 times, the motor is stopped in the PWM control circuit 24 after, for example, 3 minutes have elapsed. A signal is output to stop the brushless motor 4. By doing so, the danger of heat generation of the motor due to hermetic operation is avoided.
[0052]
Example 7
FIG. 8 is a flowchart for stopping the motor when the state in which the rotation speed of the motor does not change continues for a certain period of time. The operation of the embodiment will be described based on this flowchart.
First, when the vacuum cleaner is turned on, the microcomputer 22 performs initial processing such as RAM check and port setting (S10), and then changes the mode of the vacuum cleaner based on the command from the operation command unit 23 (input). Process), a batch display process is performed based on the display data on the display unit 8 (S11), and it is checked whether or not the brushless motor 4 of the vacuum cleaner is rotating (S12). When the vacuum cleaner is being cleaned, the Hall element 28 serving as the rotation speed detecting means detects the rotation speed of the brushless motor 4, and the auto power-off control means 37 rotates the detection signal detected by the Hall element 28. The number is sampled and held, for example, at intervals of 0.25 sec (S13), and the sampled and held current rotational speed Nn is compared with the previous sampled and held rotational speed Nn-1, and the absolute value of the difference is, for example, 30 revolutions It is confirmed whether or not the rotational speed is substantially unchanged by checking whether or not X is below (S14).
[0053]
If the rotational speed has changed substantially, the auto power off control means 37 is turned off to stop and reset the timer (S15), and then the rotational speed exceeds the rotational speed in the sucking state. Whether or not it exists is checked (S16). The number of rotations in the suction state at this time is, for example, 25000 rpm in the middle operation mode and 33300 rpm in the strong operation mode. If the rotation speed does not exceed the suction rotation speed, the dust amount is calculated as shown in the first embodiment based on the rotation speed, and the dust amount is displayed (S17). If the rotation speed exceeds the suction rotation speed, it is checked whether or not the excess state continues for, for example, 2 seconds (S18). If the rotation speed does not continue for 2 seconds, the process returns to step S17 and continues for 2 seconds. Then, the rotation speed is reduced or stopped, and the sticking prevention process is started (S19). The time during which the rotation speed of the motor in the sticking prevention process is reduced or stopped is set to, for example, 7 seconds as a time for the user to remove the sticking matter. If the sticking material cannot be removed after that time, the operation of the fifth embodiment is repeated a plurality of times as shown in the sixth embodiment, and then the motor stop signal is output to the PWM control circuit 24 to stop the brushless motor 4. Let If the sticking material is removed during the operation of the fifth embodiment, the process returns to step S11.
[0054]
On the other hand, if the rotational speed has not changed substantially, the auto power-off control means 37 is turned on to start an auto power-off timer (S20), and it is checked whether, for example, 3 minutes have passed since then (S20). S21). Then, the process returns to step S16 for 3 minutes, and when 3 minutes have elapsed, the auto power-off process is performed to stop the motor, the abnormality is taught (S22), and the process returns to step S11.
In this way, the auto power-off control means 37 samples and holds the motor speed at predetermined time intervals, compares the sample-held speed with the previous sample-held speed, and the speed remains substantially unchanged. The motor is stopped when a state where the rotational speed does not substantially change continues for a certain period of time. The above operation is safe because the rotation speed of the brushless motor 4 is not changed when the vacuum cleaner is left in a clean state due to forgetting to turn off the power, etc., and the motor is automatically stopped. It also saves energy.
[0055]
Example 8
The commercial power source used for the vacuum cleaner is normally AC 100V, but actually varies between 90V and 110V when the allowable range is ± 10%. Then, as shown in FIG. 4, since the rotational speed of the motor is very susceptible to the power supply voltage, it is necessary to correct the rotational speed with the voltage, and it is necessary to stop the motor if necessary. In the case of a blade load in the brushless motor 4 such as this time, the output P is proportional to the cube of the rotation speed N. Therefore, if the rotation mode input current at the time of AC100V input is specified, the voltage value at that time is determined from the rotation speed. Can be inferred from the calculation. Thus, the output P is proportional to the cube of the rotational speed N, and the output P is the product of the voltage V and the current I. Therefore, VI is proportional to the cube of N, and the current I is constant. Then, V is proportional to the cube of N. It becomes. Here, when the initial voltage V1 of the DC power source (in this case, indicates the rectifier circuit 20 and the voltage divider 21), V1 is proportional to the cube of N1, and when the current power source V2 of the DC power source is V2, V2 is N2. Therefore, the following relational expression is established.
V2 / V1 · k = N2 / N1
[0056]
Therefore, if the initial rotation speed N1 and the current rotation speed N2 and the initial voltage V1 of the DC power supply are known, the current power supply V2 of the DC power supply can be obtained.
In this embodiment, the relational expression is based on the initial rotation speed N1 and the current rotation speed N2 of the detection signal detected by the Hall element 28, which detects the rotation speed of the brushless motor by the voltage calculation means 43, and the initial voltage V1 of the DC power supply. From this, the current power source V2 of the DC power source is calculated, and the motor stop determining unit calculates the current power source V2 calculated by the voltage calculating unit 43, the upper limit value Vu of 115V, for example, which is larger than the preset initial voltage V1, and the initial voltage V1. Compared with a lower limit value Vd of, for example, 85V, which is smaller by a predetermined voltage, and outputs a motor stop signal to the PWM control circuit 24 when the current power source V2 calculated by the voltage calculation means 43 exceeds the upper limit value Vu or the lower limit value Vd. Since the PWM control circuit 24 stops the brushless motor 4 based on the motor stop signal, the voltage change that the power supply voltage increases or decreases. When an abnormality has occurred in the brushless motor 4 is stopped.
[0057]
Example 9
When the voltage of the commercial power source changes, the rotation speed also changes. Therefore, the data table shown in Example 1 created based on the rotation speed based on the AC 100V is used, and the implementation is based on the time of AC 100V. Even if dust amount detection or suction state detection is performed based on the reference value indicating the suction state shown in Example 2, accurate detection cannot be performed.
Therefore, in this embodiment, the DC power supplied to the inverter 26 with respect to the voltage fluctuation of the commercial power supply is also corrected corresponding to the voltage fluctuation of the commercial power supply, so that the rotational speed at the time of AC100V is corrected. It is.
[0058]
The rotation speed is corrected based on the current rotation speed N2 detected by the Hall element 28, which is the rotation detection means by the correction rotation speed calculation means 45, the initial voltage V1 of the DC power supply, and the current voltage V2 measured by the voltage measurement means. , V2 / V1 · k = N2 / Nc, Nc = N2 · [1 + {(V1 / V2) −1} · K] is used to calculate the corrected rotational speed Nc. Therefore, even if there is a voltage fluctuation, by using the corrected rotation speed Nc, it is possible to accurately detect the amount of dust and the suction state.
Next, an actual correction calculation example for the number of revolutions will be shown.
As shown in Table 2 below, the actual correction calculation is performed by selecting the DC voltage V1 and the mode coefficient for each operation mode.
[0059]
[Table 2]

[0060]
Example 10
In this embodiment, the amount of dust can be displayed linearly. The dust amount calculation means 46 calculates the corrected rotation speed Nc calculated by the correction rotation number calculation means 45 and the initial rotation when the dust amount is zero. Based on the number N1 and the rotational speed increase N100 when the amount of dust is 100%, the amount of dust is calculated from the relational expression of dust amount (%) = (Nc−N1) / N100 × 100. The dust amount indicator 8d displays the dust amount as a level based on the calculated value of the output signal of the dust amount calculating means 45. Even if there is a voltage fluctuation, the correct rotation speed Nc is used, so that an accurate dust amount is displayed. The quantity can be displayed linearly. In this way, by displaying the amount of garbage linearly, the user can be informed of the state of the garbage in the dust collection chamber, which has not been seen until now, and it remains unknown how much it has accumulated as before. It is no longer necessary to rely only on the trash dump sign, and it is possible to leave the trash to the user so that the user can use it with peace of mind.
[0061]
FIG. 9 is a block diagram showing the configuration of another embodiment of the vacuum cleaner according to the present invention, and FIG. 10 is a graph showing the relationship between the amount of dust and the current at a constant rotation speed.
In the figure, the same components as those shown in FIG.
Reference numeral 27 denotes a current detector. In this embodiment, the detection signal is input to the microcomputer 7. Reference numeral 29 denotes a rotational speed detection means, and its output is input to the PWM control circuit 24. 51 is a data table storing data indicating the correlation between the amount of dust and the input current of the brushless motor 4 corresponding to each of the strong (30000 RPM), medium (23000 RPM), and weak (14000 RPM) operation modes, and 52 is each operation. Dust amount determination means for outputting dust amount data corresponding to the input current in the mode, 35 (not shown, refer to FIG. 2) is a suction state memory in which the current value is stored as a reference value, and 53 is the input current of the brushless motor 4 This is auto power-off control means for outputting a motor stop signal when a state where the motor does not change continues for a certain period of time.
[0062]
In the vacuum cleaner of this embodiment, the rotation speed of the brushless motor 4 is detected by a hall element 28 which is a rotation detection means, and the rotation speed detected by the hall element 28 is converted into a voltage by the rotation speed detection means 29 and PWM. The control circuit 24 is fed back to control the rotational speed to be constant.
In this case, if the rotational speed is kept constant, the air volume is kept constant. Since there is a relationship Q · H = P between the air volume Q, the pressure H, and the output P, and the output P is proportional to the product of the voltage V and the current I that are the inputs of the inverter 26, Assuming that the voltage V is constant, the current I changes when the pressure H changes. Therefore, when the amount of dust inside the dust collection chamber 2 increases, the air circulation is hindered and the air volume decreases. When the pressure in the dust collection chamber 2 decreases, the current I also decreases when the voltage V is kept constant. There is a certain relationship. At this time, it is also known that there is a substantially constant relationship between the amount of dust corresponding to the pressure of the paper pack 3 inside the dust collecting chamber 2 and the input current.
Hereinafter, the Example of the vacuum cleaner in the case of constant control of rotation speed is described.
[0063]
Example 11
First, Table 3 created based on data obtained by actually measuring the amount of dust and input current in each operation mode of the vacuum cleaner is shown below.
[0064]
[Table 3]

[0065]
FIG. 10 is a graph showing the relationship between the amount of dust and the input current. The solid line in the graph is an actual measurement line of data obtained by actually measuring the amount of dust and the input current, and the alternate long and short dash line indicates the input current and the amount of dust when the amount of dust is 0%. A line obtained by linear interpolation of 100% input current, and a certain relationship is established between the amount of dust and the input current. Then, based on the linearly interpolated line, a data table 51 storing data indicating the correlation between the amount of dust and the input current corresponding to each of the strong, medium, and weak operation modes is created.
[0066]
Therefore, during cleaning of the vacuum cleaner, the current detector 27 detects the input current of the brushless motor 4, and the dust amount determination means 52 detects the input current of the detection signal detected by the current detector 27 and the data table 51. The input current corresponding to the operation mode during operation is compared, and the dust amount data corresponding to the input current in the current operation mode of the data table 51 that matches the input current of the current detector 27 is output. Then, the dust amount indicator 8d displays the dust amount ratio in the paper pack 3 as it is using the plurality of LEDs according to the output signal of the displayed dust amount determination means 52. Thus, the amount of dust in the dust collection chamber 2 in each operation mode can be known from the current value.
[0067]
Example 12
A data table that stores data indicating the correlation between the amount of dust and the input current corresponding to each of the above operating modes is based on the current location in the absence of dust at the specified specified rotation speed at the time of product shipment. Therefore, it is possible to accurately detect the amount of dust for each individual vacuum cleaner.
[0068]
Example 13
In this embodiment, the auto power-off control means 53 samples and holds the input current of the detection signal detected by the current detection means 27 at a time interval of, for example, 0.25 sec. The absolute value of the difference is, for example, 0.05 mA, and it is confirmed whether or not the input current is substantially unchanged by checking whether or not the predetermined value X is below. If the state in which the input current does not change continues for 3 minutes, for example, a motor stop signal is output to the PWM control circuit 24. Then, since the PWM control circuit 24 receives the motor stop signal and stops the brushless motor 4, if the vacuum cleaner is left in a cleaning state due to forgetting to turn off the power, the motor is automatically stopped after a certain period of time. It is safe and energy saving. When the input current has changed, normal operation is continued.
[0069]
Example 14
In this embodiment, when the brushless motor 4 is stopped by the motor stop signal in the above-described embodiment, the brushless motor 4 can be stopped immediately.
In this embodiment, when the motor reverse rotation command means 39 outputs a motor stop signal to the PWM control circuit 24, the motor reverse rotation command signal is output to the PWM control circuit 24 instead of the motor stop signal. In response to the reverse rotation command signal, the brushless motor 4 generates a reverse rotation direction torque and is stopped by reverse rotation braking. Since the brushless motor 4 is immediately stopped in this way, when the curtain, newspaper or the like is sucked into the suction port of the vacuum cleaner main body 1, the sticking material can be removed more quickly.
[0070]
Similarly to the fourteenth embodiment, this embodiment is also for immediately stopping the brushless motor 4.
In this embodiment, when the motor braking stop means 40 outputs a motor stop signal to the PWM control circuit 24, it outputs a signal for turning off the upper or lower switching element of the inverter 26 to the PWM control circuit 24, and the brushless motor 4 Is stopped by dynamic braking. Since the brushless motor 4 is immediately stopped in this way, when the curtain, newspaper or the like is sucked into the suction port of the vacuum cleaner main body 1, the sticking material can be removed more quickly.
[0071]
Similarly to the fourteenth embodiment, this embodiment is also for immediately stopping the brushless motor 4.
In this embodiment, as shown in FIG. 11, a power generation braking means 55 is provided between the brushless motor 4 and the inverter 26 so as to operate the brushless motor 4 to generate power generation braking. The power generation braking means 55 short-circuits the back electromotive force generated in the brushless motor 4 when the switch circuit 56, which is a photocoupler that is turned on in response to the motor stop signal output to the PWM control circuit 24, is turned on. The power generation braking circuit 57 is composed of six diodes that flow as a braking current.
[0072]
When the motor stop signal is output to the PWM control circuit 24, the switch circuit 56 of the power generation braking means 55 is turned on by the motor stop signal, and the power generation brake circuit 57 is short-circuited by the on operation of the switch circuit 56. A braking current flows due to the counter electromotive voltage generated in the brushless motor 4, and the brushless motor 4 is subjected to dynamic braking. Since the brushless motor 4 is immediately stopped in this way, when the curtain, newspaper or the like is sucked into the suction port of the vacuum cleaner main body 1, the sticking material can be removed more quickly.
[0073]
In the above-described embodiments, the brushless motor is taken as an example, but it goes without saying that the present invention can be implemented if other motors (for example, a universal motor, a two-layer motor, etc.) can extract the rotational speed signal. .
[0074]
【The invention's effect】
Effect of claim 1
  In a vacuum cleaner that detects an input current of a bus that supplies a voltage to an inverter in the present invention, and feedback-controls the input current to a PWM control circuit to control the input current to be constant, the dust amount determination means is a rotation of a brushless motor. Detect numberRotation speed detection meansComparing the rotation speed of the data table storing the data indicating the correlation between the rotation speed of the detection signal detected and the amount of dust corresponding to each of the plurality of operation modes and the rotation speed,Rotation speed detection meansBecause the data of the amount of dust corresponding to the number of revolutions in the current operation mode of the data table that matches the number of revolutions of the data is output, and the dust amount display means displays the amount of dust according to the output signal of the dust quantity judgment means. The amount of dust in the dust collection chamber of the vacuum cleaner body in the mode can be known from the number of rotations, and the pressure sensor cost is not required at all,There is an effect that the amount of dust can be detected at low cost.
[0075]
Effect of claim 2
  In addition, since the Hall element is used as the rotation speed detection means, the rotation speed of the brushless motor can be detected easily and at low cost.
[0076]
Effect of claim 3
  In addition, the data table storing the data indicating the correlation between the amount of dust and the rotational speed corresponding to each of the plurality of operation modes described above indicates the rotational speed in a dust-free state at a predetermined input current at the time of product shipment. By creating or correcting the reference, it is possible to accurately detect both dusts for each individual vacuum cleaner.
[0077]
Effect of claim 4
  Further, the suction state determining means detects the rotation speed of the detection signal detected by the rotation speed detection means that detects the rotation speed of the brushless motor and each of the plurality of operation modes.The inlet is in contact with the floorLocated between the number of revolutions indicating the clogged state and the number of revolutions indicating a completely sealed stateThe inlet is away from the floorThe suction state storage means that stores the rotational speed indicating the suction state as a reference value is compared with the reference value in the current operation mode, and the rotational speed of the detection signal detected by the rotational speed detection means is the suction state storage means. When the above-mentioned reference value is exceeded, a signal indicating the suction state is output, and the teaching means teaches the suction state based on the signal indicating the suction state of the suction state determination means. This has the effect that it is possible to notify the runaway of the brushless motor that the rotational speed of the brushless motor that is generated when a curtain, newspaper, or the like is sucked into the mouth increases at a stretch.
[0078]
Effect of claim 5
  Further, the motor stop means outputs a motor stop signal to the PWM control circuit that drives and controls the inverter of the brushless motor based on the signal indicating the sticking state of the sticking state determination means, and the PWM control circuit receives the motor stop signal. Since the motor is stopped, it is possible to avoid the runaway of the brushless motor that occurs when a curtain or newspaper is sucked into the suction port of the main body of the vacuum cleaner, the motor is automatically protected, and the sticking object can be removed.
[0079]
Effect of claim 6
  Further, the rotation of the motor set in the current operation mode with respect to the PWM control circuit that drives and controls the inverter of the brushless motor based on the signal indicating the sucking state of the sucking state determination means by the deceleration or stop / return command means A command to decelerate or stop at a rotational speed considerably lower than the number is output, and then a command to return the rotational speed of the motor to the rotational speed set in the current operation mode is output after the lapse of a predetermined time to remove the sticking object. The PWM control circuit decelerates or stops the motor in response to the deceleration or stop signal, and then returns to the rotation speed set in the operation mode at that time after a lapse of a predetermined time for removing the sticking object. It is possible to remove the sticky things without putting on and to enter the cleaning state smoothly again With the results.
[0080]
Effect of claim 7
  After the command output of the deceleration or stop / return command means, when a curtain or newspaper is sucked into the suction port of the main body of the vacuum cleaner, the stop command means outputs a signal indicating the sucking state by the sucking state determination means When the count value exceeds the predetermined number, the motor stop signal is output to the PWM control circuit after the predetermined time has elapsed, and when the sticking state exceeds the predetermined number, the PWM control circuit receives the stop signal and the motor Therefore, there is an effect that the danger of heat generation of the motor due to the hermetic operation can be avoided.
[0081]
The effect of claim 8
  The auto power-off control means detects the rotation speed of the brushless motor. The rotation speed of the detection signal detected by the rotation speed detection means is sampled and held at predetermined time intervals, and the rotation speed obtained by sampling and holding the rotation speed of the previous sample is held. When the absolute value of the difference is equal to or less than a predetermined value X, it is confirmed that the rotational speed does not change substantially. If the rotational speed does not change continuously for a certain period of time, the motor is connected to the PWM control circuit. Since the stop signal is output and the PWM control circuit stops the brushless motor in response to the stop signal, if the vacuum cleaner is left in a clean state without using the pressure sensor, the brushless motor will stop after a certain period of time. The motor is automatically stopped, safe, and energy saving can be realized.
[0082]
Effect of claim 9
  The voltage calculation means is based on the initial rotation speed N1 and the current rotation speed N2 of the detection signal detected by the rotation speed detection means for detecting the rotation speed of the brushless motor, and the initial voltage V1 of the DC power supply.
  The current voltage V2 of the DC power supply is calculated from the relational expression V2 / V1 · K = N2 / N1, and the motor stop determination means is a predetermined voltage from the current voltage V2 calculated by the voltage calculation means and a preset initial voltage V1. The large upper limit value Vu is compared with the lower limit value Vd which is smaller than the initial voltage V1 by a predetermined voltage, and the motor is stopped in the PWM control circuit when the current voltage V2 calculated by the voltage calculation means exceeds the upper limit value Vu or the lower limit value Vd. Since the PWM control circuit stops the brushless motor by the motor stop signal, the brushless motor is stopped when there is an abnormality in the voltage fluctuation that the power supply voltage rises or falls. It has the effect that it can be avoided.
[0083]
Effects of claim 10
  Further, the correction rotation speed calculation means is based on the current rotation speed N2 detected by the rotation speed detection means, the initial voltage V1 of the DC power supply, and the current voltage V2 measured by the voltage measurement means. V2 / V1 · K = N2 / Nc, Nc = N2 · [1 + {(V1 / V2) −1} · K] The corrected rotational speed Nc is calculated from the equation: Even if there is a voltage fluctuation, the corrected rotational speed Nc is used to cope with the voltage fluctuation. Since there is no need to have a data table, it is possible to accurately detect the amount of dust and the suction state even if the data table capacity is small.
[0084]
Effects of claim 11
  Furthermore, the dust amount calculation means is based on the corrected rotation speed Nc calculated by the correction rotation speed calculation means, the initial rotation speed N1 when the dust volume is zero, and the rotation speed increase N100 when the dust volume is 100%, The amount of dust is calculated from the relational expression of dust amount (%) = (Nc−N1) / N100 × 100, and the dust amount display means displays the dust amount by the output signal of the dust amount calculating means. This has the effect of being able to display linearly.
[0085]
Effects of claim 12
  The rotational speed of the brushless motor in the present invention is detected, the rotational speed is fed back to the motor pre-drive circuit, the rotational speed is converted to a voltage, and the converted voltage is fed back to the PWM control circuit to make the rotational speed constant. In the vacuum cleaner to be controlled, the dust amount determination means includes an input current detected by the current detection means that detects an input current of a bus that supplies a voltage to the inverter, a dust amount and an input current corresponding to each of a plurality of operation modes. Since the data of the data table storing the data indicating the correlation of the output of the dust amount corresponding to the input current in the current operation mode is output, the dust amount display means displays the dust amount by the output signal of the dust amount determination means. In each operation mode, the amount of dust in the dust collection chamber of the vacuum cleaner can be determined from the input current. An effect that can be detected dust amount at a low cost without need the cost of the pressure sensor at all.
  The auto power off control means samples and holds the input current detected by the current detection means for detecting the input current of the bus that supplies the voltage to the inverter at a predetermined time interval, and the input that has been sampled and held the previous sample hold Compared with the current, if the absolute value of the difference is less than or equal to the predetermined value X, the state where the input current is substantially unchanged is confirmed, and if the state where the input current does not substantially change continues for a certain time, PWM A motor stop signal is output to the control circuit, and the PWM control circuit receives the motor stop signal and stops the brushless motor. Therefore, if the vacuum cleaner is left in a cleaning state due to forgetting to turn off the power, the brushless motor Is automatically stopped, and it is safe and energy saving can be realized.
[0086]
Effect of Claim 13
  A data table storing data indicating the correlation between the amount of dust and the input current corresponding to each of the plurality of operation modes is based on the input current in a dust-free state at a predetermined rotation speed at the time of product shipment. Since it is created, there is an effect that an accurate amount of dust can be detected for each individual vacuum cleaner.
[0087]
Effect of claim 14
  In a vacuum cleaner that controls the input current to a constant value or the rotation speed to a constant value, when the motor reverse command means outputs a motor stop signal to the PWM control circuit that controls the drive of the brushless motor inverter, the motor stops. Instead of a signal, a motor reverse rotation command signal is output to the PWM control circuit. The PWM control circuit receives the motor reverse rotation command signal, generates a reverse rotation torque in the brushless motor, and stops by reverse braking. The brushless motor can be quickly stopped when a curtain, newspaper, or the like is sucked into the suction port, and the sucked material can be removed more quickly.
[0088]
Effect of claim 15
  Further, when the motor braking command means outputs a motor stop signal to the PWM control circuit, the motor braking command means outputs a signal for turning off the upper or lower switching element of the inverter to the PWM control circuit, and the brushless motor is driven by dynamic braking. Since it is stopped, the brushless motor can be quickly stopped when the suction opening curtain or newspaper of the main body of the vacuum cleaner is sucked, and the sucked material can be removed more quickly.
[0089]
The effect of claim 16
  Further, a power generation braking means is provided between the brushless motor and the inverter when a motor stop signal is output to the PWM control circuit, and generates power generation braking for the brushless motor based on the motor stop signal. Since the brushless motor is operated and brakes the power generation, the brushless motor can be stopped quickly when the suction curtain or newspaper of the main body of the vacuum cleaner is sucked. It has the effect.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment of a vacuum cleaner according to the present invention.
FIG. 2 is a block diagram illustrating a configuration of a control unit according to the embodiment.
FIG. 3 is a sectional view showing a schematic configuration of the embodiment.
FIG. 4 is a graph showing the relationship between the air volume and the rotational speed when the AC power supply fluctuates.
FIG. 5 is a graph showing the relationship between the amount of dust and the rotational speed.
FIG. 6 is an explanatory diagram illustrating a display example of a dust amount.
FIG. 7 is a flowchart for turning off the power after a predetermined time when a sticking state is detected.
FIG. 8 is a flowchart for stopping a motor when a state in which the rotation speed of the motor does not change continues for a certain period of time.
FIG. 9 is a block diagram showing a configuration of another embodiment of another vacuum cleaner according to the present invention.
FIG. 10 is a graph showing the relationship between the amount of dust and current when the rotation speed is constant.
FIG. 11 is a circuit diagram showing a configuration of power generation braking means.
[Explanation of symbols]
4 Brushless motor
8d Garbage amount indicator (garbage amount display means)
7 Microcomputer
20 Rectifier circuit (DC power supply)
21 Voltage divider (DC power supply)
24 PWM control circuit
25 Motor pre-drive circuit
26 Inverter
27 Current detector
28 Hall element (rotation position detection means or rotation detection means)

Claims (16)

Brushless motor mounted on the main body of the vacuum cleaner, a DC power source that outputs a constant voltage, an input side connected to the DC power source, an output side connected to the brushless motor, and an inverter having two pairs of switching elements connected in parallel, It consists of a motor pre-drive circuit that drives the switching element of the inverter with a PWM signal, and a PWM control circuit that creates a PWM signal to be output to the motor pre-drive circuit based on a plurality of commanded operation modes, and supplies voltage to the inverter In the vacuum cleaner that detects the input current of the bus to be controlled, and feedback-controls the input current to the PWM control circuit to control the input current to be constant,
A rotation speed detection means for detecting the rotation speed of the brushless motor, a data table storing data indicating a correlation between the amount of dust and the rotation speed corresponding to each of a plurality of operation modes;
The rotational speed of the detection signal detected by the rotational speed detection means is compared with the rotational speed of the data table, and the current operation mode of the data table coincides with the rotational speed of the detection signal detected by the rotational speed detection means. A vacuum cleaner comprising: dust determination means for outputting dust amount data corresponding to the number of revolutions in the; and dust amount display means for displaying the dust amount by an output signal of the dust amount determination means. 2. The electric vacuum cleaner according to claim 1, wherein the rotation speed detecting means is a hall element. A data table storing data indicating the correlation between the amount of dust and the rotational speed corresponding to each of the plurality of operation modes is based on the rotational speed in a dust-free state at a predetermined input current at the time of product shipment. The vacuum cleaner according to claim 1 or 2 , wherein the vacuum cleaner is prepared. In each of the multiple operation modes, the suction port is in contact with the floor surface, and the suction port located between the rotational speed indicating the state of clogging and the rotational speed indicating the completely sealed state is separated from the floor surface and is in a suction state The suction state storage means that stores the rotation number indicating the reference value, the rotation number of the detection signal detected by the rotation number detection means, and the reference value in the current operation mode of the suction state storage means are compared. A sucking state determination unit that outputs a signal indicating a sucking state when the rotation number of the detection signal detected by the rotation number detecting unit exceeds the reference value of the sucking state storage unit; and the sucking state 4. The vacuum cleaner according to claim 1, further comprising teaching means for teaching a suction state based on a signal output from the determination means. The detection state detected by the rotational speed detection means by comparing the rotational speed of the detection signal detected by the rotational speed detection means with the reference value in the current operation mode of the suction state storage means. Motor stop means for outputting a motor stop signal to the PWM control circuit based on a signal indicating the sticking state output when the rotation speed of the signal exceeds the reference value of the sticking state storage means; The electric vacuum cleaner according to claim 4 . The sticking state determination means compares the number of revolutions of the detection signal detected by the number of revolutions detection means with the reference value in the current operation mode of the sticking state storage means, and the detection signal detected by the number of revolutions detection means Based on the signal indicating the sticking state output when the rotational speed of the sticking state storage means exceeds the reference value, the motor rotational speed set in the current operation mode for the PWM control circuit Output a command to decelerate or stop at a considerably low rotation speed, and then output a command to return the motor rotation speed to the rotation speed set in the operation mode at that time after the lapse of a predetermined time for removing the sticking object. The electric vacuum cleaner according to claim 4 , further comprising stop / return command means. The sticking state determination means compares the number of revolutions of the detection signal detected by the number of revolutions detection means with the reference value in the current operation mode of the sticking state storage means, and the detection signal detected by the number of revolutions detection means Based on the signal indicating the sticking state output when the rotational speed of the sticking state storage means exceeds the reference value, the motor rotational speed set in the current operation mode for the PWM control circuit Output a command to decelerate or stop at a considerably low rotation speed, and then output a command to return the motor rotation speed to the rotation speed set in the operation mode at that time after the lapse of a predetermined time for removing the sticking object. Stop / return command means, and after the command output of the deceleration or stop / return command means, the above-mentioned sucking state determination means outputs a signal indicating the sucking state. Claim the count value by counting the number of times that the force is characterized by including a stop command means for outputting a motor stop signal to the PWM control circuit after a predetermined time has elapsed After exceeds a predetermined number 4 electric vacuum according Machine. The rotation speed of the detection signal detected by the rotation speed detection means is sampled and held at a predetermined time interval, the rotation speed sampled and held is compared with the rotation speed of the previous sample hold, and the absolute value of the difference is less than or equal to the predetermined value X Auto power-off control means for confirming a state where the rotational speed does not substantially change, and outputting a motor stop signal to the PWM control circuit when the state where the rotational speed does not substantially change continues for a certain period of time. The electric vacuum cleaner according to claim 1 , wherein the electric vacuum cleaner is provided. Based on the initial rotational speed N1 and the current rotational speed N2 of the detection signal detected by the rotational speed detection means and the initial voltage V1 of the DC power supply,
From the relational expression V2 / V1 · K = N2 / N1,
Voltage calculation means for calculating the current voltage V2 of the DC power supply, current voltage V2 calculated by the voltage calculation means, an upper limit value Vu that is larger than the preset initial voltage V1 by a predetermined voltage, and smaller than the initial voltage V1 by a predetermined voltage Motor stop determination means for comparing the lower limit value Vd and outputting a motor stop signal to the PWM control circuit when the current voltage V2 calculated by the voltage calculation means exceeds the upper limit value Vu or the lower limit value Vd is provided. The electric vacuum cleaner according to any one of claims 1, 2, and 3, wherein Voltage measurement means for measuring the current voltage V2 of the DC power supply, current rotation speed N2 detected by the rotation speed detection means, initial voltage V1 of the DC power supply, corrected rotation speed Nc at that time, and measurement by the voltage measurement means Between current voltage V2 and V2 / V1 · K = N2 / Nc
Nc = N2 [1 + {(V1 / V2) -1} .K]
A vacuum cleaner according to any one of claims 1, 2 and 3, further comprising: a correction rotation speed calculating means for calculating the correction rotation speed Nc from the relationship. Voltage measurement means for measuring the current voltage V2 of the DC power supply, current rotation speed N2 detected by the rotation speed detection means, initial voltage V1 of the DC power supply, corrected rotation speed Nc at that time, and measurement by the voltage measurement means Between current voltage V2 and V2 / V1 · K = N2 / Nc
Nc = N2 [1 + {(V1 / V2) -1} .K]
Correction rotation speed calculating means for calculating the correction rotation speed Nc from the relationship, correction rotation speed Nc calculated by the correction rotation speed calculation means, initial rotation speed N1 when the dust amount is zero, and dust amount 100% Based on the increase in rotation speed N100 of
A dust amount calculating means for calculating a dust amount from a relational expression of dust amount (%) = (Nc−N1) / N100 × 100, and a dust amount display means for displaying a dust amount by an output signal of the dust amount calculating means. The electric vacuum cleaner according to any one of claims 1 to 3, wherein the electric vacuum cleaner is provided. Brushless motor mounted on the main body of the vacuum cleaner, a DC power source that outputs a constant voltage, an input side connected to the DC power source, an output side connected to the brushless motor, and an inverter having two pairs of switching elements connected in parallel, Motor pre-drive circuit that drives inverter switching element by PWM signal, PWM control circuit that creates PWM signal to be output to motor pre-drive circuit based on a plurality of commanded operation modes, and PWM circuit for a plurality of operation modes A command control unit for instructing the motor to rotate the rotation speed constant by feeding back to the PWM control circuit a signal from the rotation speed detection means for detecting the motor rotation speed from the rotor position signal from the rotor position detection means. In the machine
Current detection means for detecting an input current of a bus for supplying a voltage to the inverter, a data table storing data indicating a correlation between the amount of dust and the input current corresponding to each of a plurality of operation modes, and the current detection The input current detected by the means is compared with the input current in the data table, and the amount of dust corresponding to the input current in the current operation mode of the data table corresponding to the input current detected by the current detecting means is output. The dust amount determination means, the dust amount display means for displaying the dust amount by the output signal of the dust amount determination means, the input current detected by the current detection means is sampled and held at predetermined time intervals, and the sample-held input current is Compared to the previous sampled and held input current, if the absolute value of the difference is less than or equal to the predetermined value X, the input current does not change substantially. And an automatic power-off control means for outputting a motor stop signal to the PWM control circuit when a state in which the input current does not change substantially continues for a certain period of time. Vacuum cleaner. A data table storing data indicating the correlation between the amount of dust and the input current corresponding to each of the plurality of operation modes is based on the input current in a dust-free state at a predetermined rotation speed at the time of product shipment. The vacuum cleaner according to claim 12 , wherein the vacuum cleaner is formed. When a motor stop signal is output to the PWM control circuit, a motor reverse command means is provided for outputting a motor reverse command signal to the PWM control circuit instead of the motor stop signal and stopping the brushless motor by reverse braking. The electric vacuum cleaner according to any one of claims 5, 7, 8, 9 and 12 . When a motor stop signal is output to the PWM control circuit, motor stop means is provided for outputting a signal for turning off the upper or lower switching element of the inverter to the PWM control circuit and stopping the brushless motor by dynamic braking. The electric vacuum cleaner according to any one of claims 5, 7, 8, 9 and 12, wherein Power generation braking means provided between the brushless motor and the inverter when the motor stop signal is output to the PWM control circuit and operating to generate power braking on the brushless motor based on the motor stop signal. The vacuum cleaner according to any one of claims 5, 7, 8, 9 and 12, wherein the vacuum cleaner is provided.

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