Normal Procedure for Detecting Imbalance in Automatic Washing Machines

Normal Procedure for Detecting Imbalance in Automatic Washing Machines 

The spinning procedure starts with the positioning phase. The speed is increased slowly, increasing the centrifugal acceleration on the washing until at approximately 100 rpm it is all spread completely around the drum wall, distributed as evenly as possible. Normally an imbalance will have developed at this stage. 

The speed of the drive motor and thus of the dmm is normally measured by a multipolar tachogenerator and controlled to a defined value with the assistance of a microprocessor. 

If an imbalance has developed at this stage, it will also affect the acceleration due to gravity. As a result, the speed of the drum is accelerated when the imbal- 

However, this system has considerable drawbacks. If, along with the imbalance, there is a still larger quantity of evenly distributed washing in the drum, the greater moment of the inertia of this mass stabilises the speed of the drum and gives the impression of a lower imbalance. This means that frequently only half of the actual imbalance is detected. 

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