Laundry Drum Balancing Control Across Critical Spin Speeds

The patent applies preliminary balancing action before the high-speed spinning cycle by performing balancing steps at multiple lower RPM stages (first, second, and third balancing speeds). This preliminary action redistributes the laundry to achieve better balance before the harmful high-RPM operation begins, thereby reducing noise and vibration during the productive spinning phase.

The patent implements periodic balancing interventions during the spinning cycle by alternating between acceleration phases and constant-speed balancing phases. The drum is accelerated to a balancing speed, held there for a predetermined time to allow ball redistribution, then accelerated again. This periodic action continuously maintains balance during the spinning operation, reducing vibration and noise while preserving productivity.

The patent applies the skipping principle by rapidly accelerating the drum from balancing speeds to the target spinning speed, minimizing the time spent at intermediate speeds. The acceleration phases are designed to be as short as possible while still achieving effective balancing, thereby reducing the overall duration impact of multiple balancing operations.

The patent performs balancing at three different speed stages (first, second, and third balancing speeds) which may be more than strictly necessary. This excessive action ensures thorough balancing and maximum noise reduction, with the trade-off being acceptable since each individual balancing step is brief and the cumulative time added is minimal compared to the overall spinning cycle.