Drum speed control system for a washing and/or spin drying machine.

摘要

The drum speed control is arranged to cause the drum speed to pass slowly through an intermediate "distribute" speed range when going from a relatively slow "wash" speed to a relatively high "spin" speed. This intermediate range enables the articles of laundry to distribute themselves reasonably evenly around the drum and hence prevent possible damage to the machine which would otherwise be caused by rotating an unbalanced drum load at the spin speed. In some circumstances, this distribute speed range is not effective. The invention provides a method and a system in which the speed is maintained constant at the upper end of the distribute speed range for a few seconds during which a drum out of balance test is conducted before the spin speed control is commenced. This test comprises detecting a drop in speed of at least 5%.