Method of operating a variable speed motor in a laundry treatment apparatus

A method of operating a laundry treatment apparatus, in particular a washing machine, a laundry dryer, a heat pump laundry dryer or a washing machine having a drying function, wherein the apparatus comprises:

• a control unit controlling the operation of the treatment apparatus,
• a program or program option selection unit,
• a laundry treatment chamber for treating laundry,
• a detector unit for detecting at least one operation parameter of the treatment apparatus, and
• a variable speed motor unit adapted to drive a motor with a variable speed, wherein the variable speed motor unit is adapted to drive the motor by applying a first power supply modulation mode and applying at least a second power supply modulation mode, wherein the modulation type of the first and second power supply modulation mode are different of each other,
• wherein the method comprises:
• in dependency of the selected program or program option or in dependency of the at least one apparatus operation parameter, the control unit
• disables the second power supply modulation mode such that it cannot be applied by the variable speed motor unit, or
• disables all power supply modulation modes except the first power supply modulation mode such that the variable speed motor unit can only apply the first power supply modulation mode.

A method of operating a laundry treatment apparatus, in particular a washing machine, a laundry dryer, a heat pump laundry dryer or a washing machine having a drying function, wherein the apparatus comprises:

• a control unit controlling the operation of the treatment apparatus,
• a laundry treatment chamber for treating laundry,
• a detector unit for detecting at least one operation parameter of the treatment apparatus, and
• a first variable speed motor unit adapted at least to drive the treatment chamber, and/or
• a compressor having a second variable speed motor unit for circulating a refrigerant fluid through a refrigerant loop of the laundry treatment apparatus,
• wherein the method comprises:
• selecting a predetermined power supply modulation mode for operating at least one of the first and second motor unit in dependency of the at least one detected operation parameter, and
• operating at least one of the first and second motor units in an operating cycle by applying or executing the selected predetermined power supply modulation mode,
• further wherein the selection of a predetermined modulation mode for operating at least one motor unit in dependency of the at least one detected operation parameter is started/initiated/enabled, and/or wherein the value or level of the first threshold value is adjusted, depending on one or more of the following parameters:
• an apparatus operation parameter;
• a drying program selector position;
• a program option selection;
• a drying program step;
• a drying process parameter;
• a laundry status;
• an ambient temperature;
• a time elapsed from the beginning of a laundry treatment cycle;
• a working parameter of the laundry treatment chamber, in particular laundry drum;
• a working parameter of a process air fan unit;
• a working parameter of a heat pump system;
• a motor unit working parameter;
• a user selection;
• a previous operation time of the laundry treatment apparatus;
• and
• an electrical parameter of the treatment apparatus power supply.