JP5859948B2 - Electric washing machine - Google Patents

Electric washing machine Download PDF

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JP5859948B2
JP5859948B2 JP2012247548A JP2012247548A JP5859948B2 JP 5859948 B2 JP5859948 B2 JP 5859948B2 JP 2012247548 A JP2012247548 A JP 2012247548A JP 2012247548 A JP2012247548 A JP 2012247548A JP 5859948 B2 JP5859948 B2 JP 5859948B2
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voltage
power supply
circuit
washing machine
electric motor
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JP2014094165A (en
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宇 董
宇 董
相馬　倫弘
倫弘 相馬
小森　啓礼
啓礼 小森
一秀 糸澤
一秀 糸澤
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Hitachi Appliances Inc
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Description

本発明は、電気洗濯機に係り、特に、洗濯槽を回転駆動する電動モータのブレーキ制御手段に関する。   The present invention relates to an electric washing machine, and more particularly to a brake control means for an electric motor that rotationally drives a washing tub.

特許文献１に記載されているように、商用電源から入力した交流電圧を全波整流回路で整流した後、平滑コンデンサで平滑化することにより、洗濯槽を回転駆動するブラシレスモータの直流電源を形成する直流電源形成手段を備えた電気洗濯機が従来知られている。直流電源形成手段にて形成された直流電源は、駆動制御回路（マイクロコンピュータ）からの指令信号によって駆動制御されるインバータ主回路を介して、ブラシレスモータの各巻線に供給される。   As described in Patent Document 1, a DC power source for a brushless motor that rotationally drives a washing tub is formed by rectifying an AC voltage input from a commercial power source with a full-wave rectifier circuit and then smoothing it with a smoothing capacitor. 2. Description of the Related Art Conventionally, an electric washing machine provided with a DC power source forming means is known. The direct current power generated by the direct current power generation means is supplied to each winding of the brushless motor via an inverter main circuit that is driven and controlled by a command signal from a drive control circuit (microcomputer).

また同じく特許文献１に記載されているように、脱水運転終了後のブレーキ制御時に、ブラシレスモータが発生する回生電力による平滑コンデンサの破損を防止するため、直流電源形成手段の出力側の直流電圧を検出する電圧検出手段と、ブレーキ制御時にブラシレスモータが発生する回生電力を調整する回生電力調整手段と、この回生電力の調整により直流電源形成手段の出力側の直流電圧を所定範囲内に制御する手段を含むブレーキ制御手段を備えてなる洗濯機が従来知られている。駆動制御回路は、電圧検出手段の電圧検出結果に基づいて回生電力が過大となったか否かを繰り返し判定する。そして、その電圧検出結果が基準電圧を超えたと判定したときには、回生電力調整手段によりブラシレスモータが発生する回生電力を調整する。よって、回生電力を常に一定に保つことができ、直流電源側の電気部品の破損を防止することができる（特許文献１の請求項１、段落００５５〜００５７、段落００６５〜００６７、図１参照。）。   Similarly, as described in Patent Document 1, in order to prevent the smoothing capacitor from being damaged by the regenerative power generated by the brushless motor at the time of brake control after the completion of the dehydrating operation, the DC voltage on the output side of the DC power supply forming means is Voltage detecting means for detecting, regenerative power adjusting means for adjusting regenerative power generated by the brushless motor during brake control, and means for controlling the DC voltage on the output side of the DC power source forming means within a predetermined range by adjusting the regenerative power A washing machine provided with a brake control means including The drive control circuit repeatedly determines whether or not the regenerative power has become excessive based on the voltage detection result of the voltage detection means. When it is determined that the voltage detection result exceeds the reference voltage, the regenerative power generated by the brushless motor is adjusted by the regenerative power adjusting means. Therefore, the regenerative power can always be kept constant, and the electrical components on the DC power supply side can be prevented from being damaged (see claim 1, paragraphs 0055 to 0057, paragraphs 0065 to 0067 of FIG. 1 and FIG. 1). ).

特開２００３−２２５４９３号公報JP 2003-225493 A

ところで、電気洗濯機の直流電源形成手段としては、特許文献１にも記載されているように、倍電圧整流平滑回路が用いられる。これは、ブラシレスモータへの給電を制御するインバータ主回路を構成する各スイッチング素子に流れる電流値を約半分に抑え、各スイッチング素子の電力損失を低減するためである。この倍電圧整流平滑回路からなる電気洗濯機の直流電源形成手段においては、直流電源側の電気部品の破損を防止するための基準電圧が、概ね３５０Ｖに設定される。この基準電圧値は、ブラシレスモータの起動を確保すると共に、商用電源電圧の変動及び電圧検出手段による検出電圧のばらつきを考慮して決められるものである。   By the way, as described in Patent Document 1, a voltage doubler rectifying / smoothing circuit is used as the DC power source forming means of the electric washing machine. This is to reduce the power loss of each switching element by suppressing the current value flowing through each switching element constituting the inverter main circuit that controls power supply to the brushless motor to about half. In the DC power supply forming means of the electric washing machine comprising this voltage doubler rectifying and smoothing circuit, the reference voltage for preventing damage to the electrical components on the DC power supply side is set to approximately 350V. This reference voltage value is determined in consideration of fluctuations in the commercial power supply voltage and variations in the detection voltage by the voltage detection means while ensuring the start of the brushless motor.

図３に示すように、直流電源形成手段の出力側の直流電圧は、モータブレーキモード以外の通常運転モードでは常に商用電源電圧の２×√２倍で安定している。しかしながら、モータブレーキモードでは、モータ逆起電力により発生する回生電力を抑制しながらモータのブレーキ制御を行うため、図３に示すように、直流電源形成手段の出力側の直流電圧が基準電圧値である３５０Ｖまで上昇する。このとき、倍電圧整流平滑回路に備えられた２つの平滑コンデンサの両端にかかる電圧は、それぞれ基準電圧値（３５０Ｖ）の半分である１７５Ｖ程度となる。この状態になると、モータブレーキ中に一方の平滑コンデンサ（図２の平滑コンデンサ１８ｂ参照）の両端電圧が、直流電源形成手段の入力側の直流電圧（商用電源電圧の√２倍、商用電源電圧が１００Ｖである場合には１４１Ｖ）より高くなるため、他方の平滑コンデンサ（図２の平滑コンデンサ１８ｃ参照）より放電が行われる。その放電は、当該他方の平滑コンデンサの両端に係る電圧が、商用電源電圧の直流整流電圧値（商用電源電圧の√２倍）になるまで行われる。   As shown in FIG. 3, the DC voltage on the output side of the DC power supply forming means is always stable at 2 × √2 times the commercial power supply voltage in the normal operation mode other than the motor brake mode. However, in the motor brake mode, since the brake control of the motor is performed while suppressing the regenerative power generated by the motor back electromotive force, the DC voltage on the output side of the DC power supply forming means is a reference voltage value as shown in FIG. It rises to a certain 350V. At this time, the voltage applied to both ends of the two smoothing capacitors provided in the voltage doubler rectifying and smoothing circuit is about 175 V, which is half of the reference voltage value (350 V). In this state, during motor braking, the voltage across one smoothing capacitor (see smoothing capacitor 18b in FIG. 2) becomes DC voltage on the input side of the DC power supply forming means (√2 times the commercial power supply voltage, the commercial power supply voltage is When the voltage is 100 V, the voltage is higher than 141 V), so that the other smoothing capacitor (see the smoothing capacitor 18 c in FIG. 2) discharges. The discharge is performed until the voltage applied to both ends of the other smoothing capacitor reaches the DC rectified voltage value of the commercial power supply voltage (√2 times the commercial power supply voltage).

このため、一方の平滑コンデンサの両端にかかる電圧は、図５に示すように、基準電圧値である３５０Ｖから商用電源電圧の直流整流電圧値（商用電源電圧の√２倍）を引いた電圧値になる。特に、商用電源電圧が低い時には、前記一方の平滑コンデンサの両端にかかる電圧がさらに高くなる。したがって、少なくとも前記一方の平滑コンデンサについては、部品寿命を確保するため及び直流電源形成手段の安全性を考慮して、定格電圧の高いものを採用せざるを得ず、洗濯機がコスト高になったり、制御基板の実装面積が増加して制御基板の設定が困難になるなどの問題を生じる。   For this reason, as shown in FIG. 5, the voltage applied to both ends of one smoothing capacitor is a voltage value obtained by subtracting the DC rectified voltage value of the commercial power supply voltage (√2 times the commercial power supply voltage) from the reference voltage value of 350V. become. In particular, when the commercial power supply voltage is low, the voltage applied to both ends of the one smoothing capacitor is further increased. Therefore, for at least one of the smoothing capacitors, in order to ensure the life of the parts and considering the safety of the DC power source forming means, it is unavoidable to use one having a high rated voltage, which increases the cost of the washing machine. Or the mounting area of the control board increases, making it difficult to set the control board.

本発明は、上述した従来技術の問題点に鑑みてなされたものであり、その目的は、直流電源形成手段に備えられる平滑コンデンサの両端にかかる電圧を抑制し、定格電圧の低い平滑コンデンサの採用を可能にすることを課題とする。   The present invention has been made in view of the above-described problems of the prior art, and its purpose is to suppress the voltage applied to both ends of the smoothing capacitor provided in the DC power supply forming means and to employ a smoothing capacitor having a low rated voltage. The challenge is to make this possible.

本発明は、前記課題を解決するため、洗濯物を入れる洗濯槽と、前記洗濯槽を回転駆動する電動モータと、商用電源から入力した交流電圧を整流して平滑コンデンサで平滑化することにより主回路用直流電源電圧を生成する主回路用直流電源発生回路と、前記主回路用直流電源発生回路の出力側の直流電圧値を監視する直流電源電圧監視回路と、前記主回路用直流電源発生回路の出力電圧を電源として前記電動モータへの給電を制御するインバータ回路と、前記インバータ回路を介して前記電動モータの駆動制御及びブレーキ制御を行う制御装置とを備えた電気洗濯機において、前記制御装置は、前記電動モータのブレーキ制御に先立ち、前記商用電源の電圧値に応じた制限電圧閾値の設定を行い、前記直流電源電圧監視回路により検出される直流電圧値が先に設定された制限電圧閾値を超えないように、前記インバータ回路を介して前記電動モータのブレーキ制御を行うことを特徴とする。   In order to solve the above-mentioned problems, the present invention mainly provides a washing tub for putting laundry, an electric motor for rotationally driving the washing tub, and an AC voltage input from a commercial power source and rectified and smoothed by a smoothing capacitor. DC power supply generation circuit for main circuit for generating DC power supply voltage for circuit, DC power supply voltage monitoring circuit for monitoring the DC voltage value on the output side of DC power supply generation circuit for main circuit, and DC power supply generation circuit for main circuit An electric washing machine comprising: an inverter circuit that controls power feeding to the electric motor using the output voltage of the power supply; and a control device that performs drive control and brake control of the electric motor via the inverter circuit. Prior to brake control of the electric motor, a limit voltage threshold is set according to the voltage value of the commercial power supply, and is detected by the DC power supply voltage monitoring circuit. As the DC voltage value does not exceed the limit voltage threshold set previously, and performs brake control of the electric motor via the inverter circuit.

制限電圧閾値を一定値に設定するのではなく、商用電源電圧に合わせた電圧値に設定することで、主回路用直流電源発生回路電圧と、倍電圧整流平滑用のコンデンサの両端にかかる電圧を抑えることができる。よって、倍電圧整流平滑用のコンデンサとして、従来よりも定格電圧の低い電解コンデンサを採用することが可能となり、電気洗濯機の原価低減と制御基板実装面積の削減を実現できる。   Rather than setting the limit voltage threshold to a constant value, the voltage applied to both ends of the DC power supply circuit voltage for main circuit and the voltage doubler rectifying and smoothing capacitor is set by setting the voltage value to match the commercial power supply voltage. Can be suppressed. Therefore, it is possible to employ an electrolytic capacitor having a lower rated voltage than the conventional capacitor for voltage doubler rectification smoothing, and it is possible to reduce the cost of the electric washing machine and the control board mounting area.

実施形態に係る電気洗濯機の縦断面図である。It is a longitudinal cross-sectional view of the electric washing machine which concerns on embodiment. 実施形態に係る電気洗濯機のモータ駆動回路を示す回路図である。It is a circuit diagram which shows the motor drive circuit of the electric washing machine which concerns on embodiment. 実施形態に係る電気洗濯機の運転モードの変化に伴う主回路用直流電源発生回路の出力側の電圧変化を示すグラフ図である。It is a graph which shows the voltage change by the side of the output of the direct-current power generation circuit for main circuits accompanying the change of the operation mode of the electric washing machine which concerns on embodiment. 実施形態に係る電気洗濯機の効果を示すグラフ図である。It is a graph which shows the effect of the electric washing machine which concerns on embodiment. 従来例に係る電気洗濯機の問題点を示すグラフ図である。It is a graph which shows the problem of the electric washing machine which concerns on a prior art example.

以下、本発明に係る電気洗濯機の実施形態を、図面を参照して説明する。   Hereinafter, an electric washing machine according to an embodiment of the present invention will be described with reference to the drawings.

図１に示すように、実施形態に係る電気洗濯機は、外枠１の内部に複数のサスペンション２を介して、外槽３が設置されている。また、この外槽３内には、洗濯兼脱水槽である洗濯槽４が回転可能に設置されており、この洗濯槽４内の底部には、撹拌翼５が回転可能に設置されている。洗濯槽４と撹拌翼５は、外槽３を貫通させた同心の２重軸の内端に結合されており、外槽３の外側に取り付けた主駆動装置６のモータによって回転される。   As shown in FIG. 1, in the electric washing machine according to the embodiment, an outer tub 3 is installed in the outer frame 1 via a plurality of suspensions 2. A washing tub 4 as a washing / dehydrating tub is rotatably installed in the outer tub 3, and a stirring blade 5 is rotatably installed at the bottom of the washing tub 4. The washing tub 4 and the stirring blade 5 are coupled to the inner end of a concentric double shaft passing through the outer tub 3, and are rotated by the motor of the main drive device 6 attached to the outside of the outer tub 3.

主駆動装置６は、直流ブラシレスモータ（電動モータ）とクラッチ機構と減速歯車機構を備えており、洗濯工程および乾燥工程では、洗濯槽４を静止させた状態で撹拌翼５を緩速回転駆動し、脱水工程では、洗濯槽４と撹拌翼５を一体的に高速回転駆動する。   The main drive device 6 includes a direct current brushless motor (electric motor), a clutch mechanism, and a reduction gear mechanism. In the washing process and the drying process, the stirring blade 5 is driven to rotate at a slow speed while the washing tub 4 is stationary. In the dehydration step, the washing tub 4 and the stirring blade 5 are integrally rotated at a high speed.

外枠１の上端には、衣類投入口７ａを有するトップカバー７を固着されており、衣類投入口７ａは、外蓋８によって開閉自在に覆われている。トップカバー７内の前部には、指示入力スイッチ群及び表示素子群を備えた操作基板９、制御基板１０及び水位センサ１１等を収納し、トップカバー７内の後部には、給水電磁弁１２や図示しない風呂水給水ポンプ等を収納する。   A top cover 7 having a garment input port 7 a is fixed to the upper end of the outer frame 1, and the garment input port 7 a is covered with an outer lid 8 so as to be freely opened and closed. An operation board 9 having an instruction input switch group and a display element group, a control board 10, a water level sensor 11 and the like are housed in the front part in the top cover 7, and a water supply electromagnetic valve 12 is placed in the rear part in the top cover 7. Or a bath water supply pump (not shown).

外槽３の下部に設けたエアトラップ３ａは、エアチューブ１３を介して水位センサ１１に接続されており、排水口３ｂは、排水電磁弁１４を介して排水ホース１５に接続されている。なお、乾燥機能付きの電気洗濯機については、外槽３の底部側壁に排気口を形成し、外槽３内の空気を空気循環ファンにより吸い出して、冷却除湿した後に加熱して洗濯槽４の上方から該洗濯槽４内に吹き込む乾燥空気循環系（図示省略）が備えられる。   The air trap 3 a provided at the lower part of the outer tub 3 is connected to the water level sensor 11 via the air tube 13, and the drain port 3 b is connected to the drain hose 15 via the drain electromagnetic valve 14. In addition, about the electric washing machine with a drying function, an exhaust port is formed in the bottom side wall of the outer tub 3, the air in the outer tub 3 is sucked out by an air circulation fan, cooled and dehumidified, and then heated to heat the washing tub 4. A dry air circulation system (not shown) that blows into the washing tub 4 from above is provided.

次に、図２を用いて、主駆動装置６に備えられた直流ブラシレスモータの駆動回路について説明する。このモータ駆動回路は、主として主制御基板１０に実装される。   Next, a drive circuit for a DC brushless motor provided in the main drive device 6 will be described with reference to FIG. This motor drive circuit is mainly mounted on the main control board 10.

図２に示すように、本例のモータ駆動回路は、主駆動装置６に備えられた直流ブラシレスモータ６ａに給電するインバータ回路１７と、インバータ回路１７の直流電源となる主回路用直流電源発生回路１８と、主回路用直流電源発生回路１８の出力側の直流電圧値を監視する直流電源電圧監視回路１９と、給水電磁弁等の電気負荷を制御する回路（図示省略）に給電する制御回路用直流源発生回路２２と、商用電源２１の交流電圧値及び直流電源電圧監視回路１９から出力される直流監視電圧値に基づいて直流ブラシレスモータ６ａの駆動制御を行うマイクロコンピュータ（制御装置）２０を備えている。   As shown in FIG. 2, the motor drive circuit of this example includes an inverter circuit 17 that supplies power to a DC brushless motor 6 a provided in the main drive device 6, and a DC power supply generation circuit for a main circuit that serves as a DC power supply for the inverter circuit 17. 18, a DC power supply voltage monitoring circuit 19 for monitoring the DC voltage value on the output side of the DC power supply generation circuit 18 for the main circuit, and a control circuit for supplying power to a circuit (not shown) for controlling an electric load such as a water supply solenoid valve A DC source generation circuit 22 and a microcomputer (control device) 20 that controls the driving of the DC brushless motor 6a based on the AC voltage value of the commercial power supply 21 and the DC monitoring voltage value output from the DC power supply voltage monitoring circuit 19 are provided. ing.

主回路用直流電源発生回路１８は、倍電圧整流平滑回路を構成するように接続した整流ダイオードブリッジ回路１８ａと、該整流ダイオードブリッジ回路１８ａの直流端子から出力する整流脈動電圧を平滑して得た直流電圧にする平滑コンデンサ１８ｂ、１８ｃを備える。整流ダイオードブリッジ回路１８ａの交流端子は、常開の電源リレー接点（図示省略）を介して商用交流電源２１に接続されている。   The DC power generation circuit for main circuit 18 is obtained by smoothing a rectifying diode bridge circuit 18a connected so as to constitute a voltage doubler rectifying / smoothing circuit and a rectified pulsation voltage output from the DC terminal of the rectifying diode bridge circuit 18a. Smoothing capacitors 18b and 18c for making a DC voltage are provided. The AC terminal of the rectifier diode bridge circuit 18a is connected to the commercial AC power supply 21 via a normally open power relay contact (not shown).

直流電源電圧監視回路１９は、主回路用直流電源発生回路１８の出力側の直流電圧を分圧する２つの抵抗器１９ａ、１９ｂを備える。マイクロコンピュータ２０は、この直流電源電圧監視回路１９から出力される電圧アナログ値を読み取り、常にモータ駆動用主回路直流電源電圧を監視する。   The DC power supply voltage monitoring circuit 19 includes two resistors 19 a and 19 b that divide the DC voltage on the output side of the main circuit DC power supply generation circuit 18. The microcomputer 20 reads the voltage analog value output from the DC power supply voltage monitoring circuit 19 and always monitors the motor drive main circuit DC power supply voltage.

制御回路用直流電源発生回路２２は、商用電源２１を半波整流する半波整流ダオード２２ａと、半波整流ダイオード２２ａを通して出力する半波整流の脈動電圧を平滑して直流電圧にする平滑用電解コンデンサ２２ｂと、電圧変換回路であるスイッチング電源回路２２ｃと、ＤＣ−ＤＣコンバータ回路２２ｄとを備える。   The control circuit DC power supply generation circuit 22 smoothes the half-wave rectifier diode 22a for half-wave rectifying the commercial power supply 21 and the half-wave rectification pulsating voltage output through the half-wave rectifier diode 22a to make the DC voltage smooth. A capacitor 22b, a switching power supply circuit 22c that is a voltage conversion circuit, and a DC-DC converter circuit 22d are provided.

本構成のモータ駆動回路は、商用電源２１から主回路用直流電源発生回路１８の整流ダイオードブリッジ１８ａに商用交流電圧を供給し、整流ダイオードブリッジ１８ａは交流電圧を整流して平滑コンデンサ１８ｂと１８ｃをそれぞれ充電するため、商用電源電圧のほぼ２倍になる直流電圧を生成する。そして、インバータ回路１７に安定した所定の直流電圧を供給する状態となり、洗濯，脱水，乾燥の工程制御が可能な状態となる。   The motor drive circuit of this configuration supplies a commercial AC voltage from the commercial power source 21 to the rectifier diode bridge 18a of the DC power generation circuit 18 for the main circuit, and the rectifier diode bridge 18a rectifies the AC voltage to provide smoothing capacitors 18b and 18c. In order to charge each, a DC voltage that is almost twice the commercial power supply voltage is generated. And it will be in the state which supplies the predetermined DC voltage stable to the inverter circuit 17, and will be in the state in which washing, dehydration, and drying process control are possible.

先に説明したように、モータブレーキモード以外の洗濯、乾燥及び脱水回転等の通常運転モードにおいては、主回路用直流電源発生回路１８に備えられた倍電圧整流平滑用の電解コンデンサ１８ｂ及び１８ｃと、制御回路用直流源発生回路２２に備えられた平滑用の電解コンデンサ２２ｂとは、商用電源２１より電圧を供給され、モータや制御回路の負荷電流の増加により多少電圧低下しても、それぞれの端子電圧がほぼ商用電源電圧の√２倍に安定している（図３参照）。   As described above, in the normal operation mode such as washing, drying, and spin-drying rotation other than the motor brake mode, electrolytic capacitors 18b and 18c for voltage doubler rectification smoothing provided in the DC power generation circuit for main circuit 18 The smoothing electrolytic capacitor 22b provided in the control circuit DC source generation circuit 22 is supplied with a voltage from the commercial power supply 21, and even if the voltage drops slightly due to an increase in the load current of the motor or control circuit, The terminal voltage is stable to approximately √2 times the commercial power supply voltage (see FIG. 3).

これに対して、モータブレーキモードにおいては、減速により直流ブラシレスモータ６ａが発電機として動作するため、その回転動作エネルギーが回生電力に変換され、その回生電力が直流ブラシレスモータ６ａ側からインバータ回路１７を介して、主回路用直流電源発生回路１８に流れ込む。主回路用直流電源発生回路１８に流れ込んだ回生電力は、倍電圧整流平滑用の電解コンデンサ１８ｂと１８ｃにチャージし、電解コンデンサ１８ｂと１８ｃの端子電圧が上昇する。そのため、マイクロコンピュータ２０は、主回路用直流電源発生回路１８に備えられた整流ダイオード１８ａ及び電解コンデンサ１８ｂ、１８ｃと、インバータ回路１７を構成するインバータ素子を過電圧から守るため、設定した制限電圧を目標に主回路の直流電圧を抑制しながら、直流ブラシレスモータ６ａの減速制御を行う。減速制御の原理は、特許文献１に記載されている通りである。   On the other hand, in the motor brake mode, since the DC brushless motor 6a operates as a generator due to deceleration, the rotational operation energy is converted into regenerative power, and the regenerative power is supplied to the inverter circuit 17 from the DC brushless motor 6a side. To the main circuit DC power supply generation circuit 18. The regenerative power flowing into the main circuit DC power generation circuit 18 charges the electrolytic capacitors 18b and 18c for voltage doubler rectification and smoothing, and the terminal voltages of the electrolytic capacitors 18b and 18c rise. Therefore, the microcomputer 20 sets the target limit voltage to protect the rectifier diode 18a and the electrolytic capacitors 18b and 18c provided in the main circuit DC power generation circuit 18 and the inverter elements constituting the inverter circuit 17 from overvoltage. In addition, the DC brushless motor 6a is decelerated while suppressing the DC voltage of the main circuit. The principle of deceleration control is as described in Patent Document 1.

実施形態に係る電気洗濯機の特徴は、直流ブラシレスモータ６ａを減速制御する際の制限電圧（制限電圧閾値）を、商用電源２１の電圧値に応じて可変に設定する点にある。即ち、モータブレーキ時に電解コンデンサ１８ｂの両端にかかる電圧は、制限電圧閾値Ｖｓ（３５０Ｖ）から商用電源電圧の直流整流電圧値を引いた電圧値であることから、下記の式１により電解コンデンサ１８ｂの両端にかかる電圧が求められる。   A feature of the electric washing machine according to the embodiment is that a limit voltage (limit voltage threshold) when the DC brushless motor 6a is controlled to be decelerated is variably set according to the voltage value of the commercial power source 21. That is, the voltage applied to both ends of the electrolytic capacitor 18b during motor braking is a voltage value obtained by subtracting the DC rectified voltage value of the commercial power supply voltage from the limit voltage threshold Vs (350V). The voltage across both ends is required.

Ｖｃ１＝Ｖｓ−Ｖａｃ×√２ 式１
そこで、電解コンデンサ１８ｂの両端に印加する電圧が制限電圧閾値と商用電源電圧に関係するため、電解コンデンサ１８ｂの両端に係る電圧値Ｖｃ１を抑えるには、制限電圧閾値Ｖｓも商用電源電圧に応じて変動させて設定することが有効である。 Vc1 = Vs−Vac × √2 Equation 1
Therefore, since the voltage applied to both ends of the electrolytic capacitor 18b is related to the limit voltage threshold and the commercial power supply voltage, in order to suppress the voltage value Vc1 related to both ends of the electrolytic capacitor 18b, the limit voltage threshold Vs also depends on the commercial power supply voltage. It is effective to set by changing.

即ち、上述したように、モータブレーキモード以外のモータ通常回転モードでは、倍電圧整流平滑回路に備えられた電解コンデンサ１８ｂ、１８ｃの両端にそれぞれ印加される電圧は、およそ商用電源電圧の整流した後に得た直流電圧になることから、日本国内の商用電源電圧仕様及び電解コンデンサの寿命を維持するための定格電圧に対するディレーティング率を考慮し、電解コンデンサ１８ｂ、１８ｃの定格電圧は、２００Ｖ程度とすることが妥当である。一方、モータブレーキモードにおいて、商用電源電圧が変動した場合でも、電解コンデンサ１８ｂ両端に印加する電圧を、通常運転モードと同様に、定格電圧２００Ｖに対して電解コンデンサ１８ｂ、１８ｃの寿命を維持するため、制限電圧閾値Ｖｓを、ディレーティング率を考慮して、下記の式２で求められる電圧値に設定する。   That is, as described above, in the normal motor rotation mode other than the motor brake mode, the voltage applied to both ends of the electrolytic capacitors 18b and 18c provided in the voltage doubler rectifying and smoothing circuit is approximately after the commercial power supply voltage is rectified. Since the obtained DC voltage is obtained, the rated voltage of the electrolytic capacitors 18b and 18c is set to about 200 V in consideration of the commercial power supply voltage specification in Japan and the derating rate with respect to the rated voltage for maintaining the life of the electrolytic capacitor. It is reasonable. On the other hand, in the motor brake mode, even when the commercial power supply voltage fluctuates, the voltage applied to both ends of the electrolytic capacitor 18b is maintained at the rated voltage of 200V for the life of the electrolytic capacitors 18b and 18c as in the normal operation mode. The limit voltage threshold Vs is set to a voltage value obtained by the following equation 2 in consideration of the derating rate.

Ｖｓ＝１８０Ｖ＋Ｖａｃ×√２ 式２
つまり、図４に示すように、商用電源電圧が高い場合には、制限電圧閾値Ｖｓを高く設定し、商用電源電圧が低い場合には、制限電圧閾値Ｖｓを低く設定する。これにより、モータブレーキモードにおける直流ブラシレスモータ６ａの回生電力を抑制できると共に、主回路用直流電源発生回路１８に備えられる平滑用電解コンデンサ１８ｂの両端にかかる電圧を抑えることができる。 Vs = 180V + Vac × √2 Equation 2
That is, as shown in FIG. 4, when the commercial power supply voltage is high, the limit voltage threshold Vs is set high, and when the commercial power supply voltage is low, the limit voltage threshold Vs is set low. Thereby, the regenerative power of the DC brushless motor 6a in the motor brake mode can be suppressed, and the voltage applied to both ends of the smoothing electrolytic capacitor 18b provided in the main circuit DC power generation circuit 18 can be suppressed.

なお、制限電圧閾値Ｖｓの設定は、ノイズの影響を除外するため、直流ブラシレスモータ６ａを脱水モードで回転する直前で行うことが望ましい。マイクロコンピュータ２０は、このタイミングで直流電源電圧監視回路１９から読み取った数値に基づいて商用電源電圧Ｖａｃを算出し、得られた商用電源電圧Ｖａｃを式２に代入して、制限電圧閾値Ｖｓを算出する。   The limit voltage threshold Vs is preferably set immediately before the DC brushless motor 6a is rotated in the dewatering mode in order to eliminate the influence of noise. The microcomputer 20 calculates the commercial power supply voltage Vac based on the numerical value read from the DC power supply voltage monitoring circuit 19 at this timing, and substitutes the obtained commercial power supply voltage Vac into Equation 2 to calculate the limit voltage threshold Vs. To do.

一方、モータブレーキ時には、直流ブラシレスモータ６ａが発生する回生電力が電解コンデンサ１８ｂ、１８ｃにチャージされ、各電解コンデンサの端子電圧が上昇するため、電解コンデンサ１８ｃの端子電圧が制御回路用直流電源発生回路２２の平滑用電解コンデンサ２２ｂよりも高くなり、ダイオード２２ａが開放状態になる。これにより、電解コンデンサ１８ｃより電解コンデンサ２２ｂに充電する経路ができるので、電解コンデンサ１８ｃの両端電圧が、商用電源電圧の√２倍、即ち、Ｖａｃ×√２で安定する。このとき、電解コンデンサ１８ｂの両端電圧は、制限電圧閾値Ｖｓと電解コンデンサ１８ｃの差分である約１８０Ｖとなり、定格電圧（２００Ｖ）以下となる。よって、倍電圧整流平滑用の電解コンデンサ１８ｂ、１８ｃとして、従来よりも定格電圧の低いものを採用することが可能となり、電気洗濯機の原価低減と制御基板実装面積の削減を実現できる。   On the other hand, at the time of motor braking, the regenerative power generated by the DC brushless motor 6a is charged in the electrolytic capacitors 18b and 18c, and the terminal voltage of each electrolytic capacitor rises, so that the terminal voltage of the electrolytic capacitor 18c becomes the DC power generation circuit for the control circuit. 22 is higher than the smoothing electrolytic capacitor 22b, and the diode 22a is opened. As a result, a path for charging the electrolytic capacitor 22b from the electrolytic capacitor 18c is formed, so that the voltage across the electrolytic capacitor 18c is stabilized at √2 times the commercial power supply voltage, that is, Vac × √2. At this time, the voltage across the electrolytic capacitor 18b is about 180V, which is the difference between the limit voltage threshold Vs and the electrolytic capacitor 18c, and is equal to or lower than the rated voltage (200V). Therefore, it is possible to employ electrolytic capacitors 18b and 18c for voltage doubler rectification smoothing that have a lower rated voltage than the conventional ones, and it is possible to reduce the cost of the electric washing machine and the control board mounting area.

また仮に、ブレーキ中に商用電源電圧が（±１０％）変動した場合、特に商用電源電圧が低くなった場合でも、電解コンデンサ１８ｂの両端電圧は高くなるが、定格電圧よりオーバーすることなく、使用寿命の低下には至らない。   Also, if the commercial power supply voltage fluctuates (± 10%) during braking, even if the commercial power supply voltage is low, the voltage across the electrolytic capacitor 18b increases, but it does not exceed the rated voltage. The life is not reduced.

本発明は、洗濯槽を横軸や斜め軸に設置すると共に、撹拌翼を省略したドラム式の電気洗濯機にもそのまま適用することができる。   The present invention can be directly applied to a drum-type electric washing machine in which a washing tub is installed on a horizontal axis or an oblique axis and a stirring blade is omitted.

本例の電気洗濯機は、モータブレーキ時の制限電圧閾値Ｖｓを一定値ではなく、商用電源２１の交流電圧値Ｖａｃに応じた電圧値に設定するので、主回路用直流電源発生回路１８の直流電圧と、倍電圧整流平滑用の電解コンデンサ１８ｂ両端にかかる電圧を抑えることができる。よって、定格電圧の低い電子部品（電解コンデンサ）の採用が可能となり、電気洗濯機の原価低減と、部品サイズの小型化による制御基板実装面積の削減を実現することができる。   In the electric washing machine of this example, the limit voltage threshold Vs during motor braking is set to a voltage value corresponding to the AC voltage value Vac of the commercial power supply 21 instead of a constant value. The voltage and the voltage applied to both ends of the electrolytic capacitor 18b for voltage doubler rectification smoothing can be suppressed. Therefore, it is possible to employ an electronic component (electrolytic capacitor) having a low rated voltage, and it is possible to reduce the cost of the electric washing machine and reduce the control board mounting area by reducing the component size.

１ 外枠
２ サスペンション
３ 外槽
３ａ エアトラップ
３ｂ 排水口
４ 洗濯槽
５ 撹拌翼
６ 主駆動装置
６ａ 直流ブラシレスモータ
７ トップカバー
７ａ 衣類投入口
８ 外蓋
９ 操作基板
１０ 制御基板
１１ 水位センサ
１２ 給水電磁弁
１３ エアチューブ
１４ 排水電磁弁
１５ 排水ホース
１７ インバータ回路
１８ 主回路用直流電源発生回路
１８ａ 整流ダイオードブリッジ回路
１８ｂ、１８ｃ 平滑コンデンサ（電解コンデンサ）
１９ 直流電源電圧監視回路
１９ａ、１９ｂ 抵抗器
２０ マイクロコンピュータ（制御装置）
２１ 商用電源
２２ 制御回路用直流源発生回路
２２ａ 半波整流ダオード
２２ｂ 平滑コンデンサ（電解コンデンサ）
２２ｃ スイッチング電源回路
２２ｄ ＤＣ−ＤＣコンバータ回路 DESCRIPTION OF SYMBOLS 1 Outer frame 2 Suspension 3 Outer tub 3a Air trap 3b Drain port 4 Washing tub 5 Stirring blade 6 Main drive device 6a DC brushless motor 7 Top cover 7a Clothing input port 8 Outer lid 9 Operation board 10 Control board 11 Water level sensor 12 Water supply electromagnetic Valve 13 Air tube 14 Drain solenoid valve 15 Drain hose 17 Inverter circuit 18 DC power generation circuit for main circuit 18a Rectifier diode bridge circuit 18b, 18c Smoothing capacitor (electrolytic capacitor)
19 DC power supply voltage monitoring circuit 19a, 19b Resistor 20 Microcomputer (control device)
21 Commercial Power Supply 22 DC Source Generation Circuit for Control Circuit 22a Half-wave Rectifier Diode 22b Smoothing Capacitor (Electrolytic Capacitor)
22c switching power supply circuit 22d DC-DC converter circuit

Claims (2)

洗濯物を入れる洗濯槽と、前記洗濯槽を回転駆動する電動モータと、商用電源から入力した交流電圧を整流して平滑コンデンサで平滑化することにより主回路用直流電源電圧を生成する主回路用直流電源発生回路と、前記主回路用直流電源発生回路の出力側の直流電圧値を監視する直流電源電圧監視回路と、前記主回路用直流電源発生回路の出力電圧を電源として前記電動モータへの給電を制御するインバータ回路と、前記インバータ回路を介して前記電動モータの駆動制御及びブレーキ制御を行う制御装置とを備えた電気洗濯機において、
前記制御装置は、前記電動モータのブレーキ制御に先立ち、前記商用電源の電圧値に応じた制限電圧閾値の設定を行い、前記直流電源電圧監視回路により検出される直流電圧値が先に設定された制限電圧閾値を超えないように、前記インバータ回路を介して前記電動モータのブレーキ制御を行うことを特徴とする電気洗濯機。 For a main circuit that generates a DC power supply voltage for a main circuit by rectifying an AC voltage input from a commercial power source and smoothing it with a smoothing capacitor, a washing tub for storing laundry, an electric motor for rotationally driving the laundry tub DC power supply generation circuit, DC power supply voltage monitoring circuit for monitoring the DC voltage value on the output side of the main circuit DC power supply generation circuit, and the output voltage of the main circuit DC power supply generation circuit as a power source to the electric motor In an electric washing machine comprising an inverter circuit that controls power feeding, and a control device that performs drive control and brake control of the electric motor via the inverter circuit,
Prior to brake control of the electric motor, the control device sets a limit voltage threshold corresponding to the voltage value of the commercial power supply, and the DC voltage value detected by the DC power supply voltage monitoring circuit is set first. An electric washing machine that performs brake control of the electric motor through the inverter circuit so as not to exceed a limit voltage threshold. 請求項１に記載の電気洗濯機において、
前記制限電圧閾値の設定は、前記制御装置からの指令により前記電動モータを脱水モードで回転駆動する直前に行うことを特徴とする電気洗濯機。 In the electric washing machine according to claim 1 ,
The limit voltage threshold is set immediately before the electric motor is rotationally driven in a dehydration mode in accordance with a command from the control device.
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