Method of controlling amenity products or rotating machines

A method of controlling an amenity product or rotating machine comprising the steps of:

• deciding values of control parameters according to a fundamental rule;
• deciding values of said control parameters recursively according to said fundamental rule;
• and
• performing an iteration operation of said amenity product or rotating machine based upon the recursively decided control parameters,
• wherein the iteration step is performed by using a first period for performing powered rotation and a second period for performing coasting rotation as control parameters, and wherein said fundamental rule gradually reduces said first period at a first reduction rate and said second period at a second reduction rate.

A method of controlling an amenity product or rotating machine comprising the steps of:

• deciding values of control parameters according to a fundamental rule;
• deciding values of said control parameters according to said fundamental rule which slowly reduces at least one value of said control parameters at a predetermined reduction rate per each occurrence of a recursive decision;
• and
• performing an iteration operation of said amenity product or rotating machine based upon the recursively decided control parameters,
• wherein at least one of said control parameters, the reduction rate thereof, and number of times the iteration step occurs is set as a random amount varying within a predetermined range.

An operation control method of an electric washing machine or impeller type electric clothes dryer for washing or drying clothes by rotating an impeller, agitator, or drum and by controlling the powered rotation angle, said method comprising the steps of:

• deciding at least a powered rotation angle according to a fundamental rule which makes power spectra of at least said powered rotation angle, at least statistically, inversely proportional to the frequency of said power spectra, to the power of a spectral index value;
• controlling the powered rotation angle and a coasting rotation period of at least one of said impeller, agitator, or drum;
• and
• reducing at least said powered rotation angle gradually at a predetermined reduction rate and deciding the powered rotation angle recursively.