CONTROL DEVICE FOR WASHING MACHINE MOTOR

PROBLEM TO BE SOLVED: To provide a control device for a washing machine motor which, without using expensive components, can more reliably detect disconnection.SOLUTION: A control device 39 for a three-phase permanent magnet type motor 14 for performing washing operation executes processing for dete...

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Hauptverfasser: SHIBANO YUSUKE, HOSOITO TSUYOSHI
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a control device for a washing machine motor which, without using expensive components, can more reliably detect disconnection.SOLUTION: A control device 39 for a three-phase permanent magnet type motor 14 for performing washing operation executes processing for detecting rotation abnormality in the motor on the basis of: a current detection resistor 24 inserted between lower switching elements in an inverter circuit 21 for driving the motor and the ground; and an output signal of a position sensor 44 for detecting a rotor rotation position of the motor. Specifically, when a terminal voltage of the current detection resistor 24 (an output signal of a comparator 29) is subjected to A/D conversion, and it is compared with a reference value to detect disconnection abnormality, a switching state of the inverter circuit is controlled so that a current detected in the current detection resistor becomes a current which is passed through any coil of one phase of the motor in a concentrated manner, and such control is performed for every phase of the motor, thereby detecting disconnection abnormality. At that time, not only disconnection but also an overcurrent is detected by a comparator 28.SELECTED DRAWING: Figure 9 【課題】高価な構成要素を用いることなく、且つ断線をより確実に検知できる洗濯機モータの制御装置を提供する。【解決手段】洗濯運転を行うための3相の永久磁石型モータ14の制御装置39は、モータを駆動するインバータ回路21の下側スイッチング素子とグランドとの間に挿入される電流検出抵抗24と、モータのロータ回転位置を検出する位置センサ44の出力信号にと基づいてモータの回転異常を検出する処理を実行する。即ち電流検出抵抗24の端子電圧(コンパレータ29の出力信号)をA/D変換して基準値と比較することで断線異常を検出する際に、電流検出抵抗で検出される電流がモータの何れか1相の巻線に集中して通電される電流となるようにインバータ回路のスイッチング状態を制御するが、かかる制御をモータの全ての相で行うことで断線異常を検出する。その際、断線のみならず過電流についても、コンパレータ28で検出される。【選択図】図9