Roller washing machine and unbalance detection method and device thereof

Abstract

The invention belongs to the field of detection and control technologies of washing machines and provides a roller washing machine and an unbalance detection method and device of the roller washing machine. The method comprises the steps that when a roller operates at a low uniform velocity, the torque of the roller is detected, and the average value of torque ripple is acquired; afterwards, when the roller operates in a constant-acceleration mode, the torque ripple values of the roller are acquired in real time, and whether dynamic unbalance happens on the roller or not is judged according to the average value of torque ripple and the torque ripple values; if yes, the roller is controlled to stop accelerated operation, and whether the frequency of shake scattering operations executed by the roller is larger than a preset frequency value or not is judged; if yes, the roller is controlled to stop operation; if not, the roller is controlled to execute shake scattering operations and then operates at a low velocity, and static unbalance detection is performed on the roller during low-velocity operation of the roller; accordingly, there is no need to adopt sensors for unbalance detection, so that the cost and detection difficulty are lowered; besides, the problem that dynamic unbalance detection is performed during high-velocity operation of the roller, so that mechanical parts are collided and damaged is avoided.

Description

technical field [0001] The invention belongs to the technical field of detection and control of washing machines, and in particular relates to a drum washing machine and an unbalance detection method and device thereof. Background technique [0002] In the drum washing machine, when the drum 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, which will reduce the service life of the drum washing machine. The variable frequency motor has load unbalance detection function. When the load (such as drum) is found to be unbalanced, the speed can be adjusted or the unbalanced state of the load can be changed to reduce the vibration and noise of the system. [0003] The prior art provides the following two unbalance detection methods: [0004] (1) A sensor is used to detect whether the drum is balanced, but the cost of the sensor is high and it is not easy to install, whi...

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Problems solved by technology

[0007] The object of the present invention is to provide a drum washing machine unbalance detection method, aiming to solve the existing problems of high cost and difficult detection in the prior art, the inability to detect the dynamic unbalance of the drum in the low-speed operation stage and the dynamic unbalance detection in the high-speed operation stage. Unbalance detection can easily cause collision damage to the mechanical parts inside the washing machine

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