Washing machine and its unbalance detection method and device

Abstract

The invention discloses a washing machine and imbalance testing method and device thereof, the operation of the washing machine comprises the steps of controlling a washing barrel to operate at an accelerated speed according to a preset acceleration speed; in the process of accelerated operation of the washing barrel, detecting on a real time basis the electric current of the working of an electric engine, and calculating the capacity rate of the electric engine according to the electric current of the working of the electric engine; obtaining the capacity rates of more than one electric engine within the time per rotation circle of the washing barrel, and calculating the average value of the capacity rate of the electric engine according to the capacity rates of more than one electric engine, as well as the average value of the capacity rates of stored electric power; obtaining the lowest value of the average of the capacity rates of the stored electric power, and comparing the current average value of the capacity rates of the electric engine obtained from the calculation with the obtained lowest value to judge whether the washing barrel is in a dynamically imbalanced state. The method can achieve the detection of the dynamically imbalanced state of the washing barrel with no necessity of adopting a sensor, effectively brings down the cost of the detection and the degree of difficulty for detection, and avoids the problems brought by collisions and damages of machinery parts when carrying out the detection of the dynamically imbalanced state in the process of accelerated operation of the washing barrel.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to an unbalance detection method of a washing machine, an unbalance detection device of the washing machine and a washing machine with the device. Background technique [0002] During the operation of the washing machine, when the washing tub driven by the frequency conversion motor is unbalanced, the higher the speed of the frequency conversion motor, the greater the vibration and noise of the system, thereby reducing the service life of the washing machine. As for the variable frequency motor, it has the function of load unbalance detection, that is, when the load (such as the washing bucket) is unbalanced, the purpose of reducing the vibration and noise of the system can be achieved by adjusting the speed or adjusting the unbalanced state of the load. [0003] In related technologies, sensors are used to detect the unbalance of the laundry tub, but the cost of the se...

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Problems solved by technology

[0003] In related technologies, sensors are used to detect the unbalance of the laundry tub, but the cost of the sensor is high and it is not easy to install, which makes the detection difficult; Unbalance detection, in which, in the low-speed operation stage, since the motor runs at a constant speed at a fixed speed, it is impossible to realize the dynamic unbalance detection of the laundry tub when performing static unbalance detection on the laundry tub. Balance detection, which will cause the mechanical parts inside the washing machine to collide, resulting in damage to the washing machine

[0004] Therefore, the detection method in the related art has the problems of high cost, high detection difficulty, and dynamic unbalance detection during the high-speed operation stage may easily cause collision damage to the internal mechanical parts of the washing machine

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