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What is the meaning of voltage fluctuation in washing machine? 

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The research on unbalanced load increase the performance of the washing machine and in addition to this, this research can be used to eliminate unbalanced load in future studies.
The measured zero sequence voltage is shown to contain reliable information on the condition of the machine, with little influence from the operating point or imbalances in the phase voltages.
The recreation of voltage changes allows recalculation of voltage fluctuation indices to other parameters describing voltage variations, and allows determination of parameters associated with sources of voltage fluctuations.
Results show the washing spin speed is a crucial factor with washing cycle duration having minimal impact when determining circuit functionality survival.
This study presents an improved high frequency voltage injection based sensor less control for Permanent Magnet Synchronous Motor (PMSM) designed for washing machines.
Unbalanced load in washing machines limit the performance, and therefore accurate estimation of unbalanced loads, including their magnitudes and locations in washing drum, is required.
This solution provides very good performance under current and voltage limitations and represents a viable alternative for washing machine applications.
In total, savings of more than 12 TWh of electricity and about 870 million m3 of water could be achieved every year by increasing the water and energy efficiency of washing machines and changing the consumer behavior towards better use of the washing machine capacity and the frequent use of low wash temperatures.
Simulation results illustrate that the proposed system is quite effective for washing machine applications and robust against variations of motor parameters.

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