Abstract: A commercial refrigerator for energy savings and a method to operate thereof. The refrigerator comprises a cabinet, the cabinet with a first cavity with an inner part, an access to said inner part and an air chamber set in the inner part, the air chamber comprising a fan which makes the air pass through an evaporator, a thawing resistance which thaws the evaporator, a cover with first slits which allow an air flow emanating from the first cavity towards the inner part of said air chamber and second slits that allow air flow cooled by the evaporator emanating from the inner part of said air chamber to the first cavity; temperature sensors set within the inner part of the air chamber, a first temperature sensor set between the first slit and the fan and a second temperature sensor set between the evaporator and the second slits, said sensors connected to an electronic control.

Abstract: A system to control an asynchronous tri-phase motor may include a braking resistance coupled to receive output voltage from the voltage multiplier to dissipate energy when the system is in a braking mode. The system may further include a module to emit a pulse train (e.g., Pulse Width Modulation (PWM)) and having a frequency selectively determined by a microcontroller. The module may be operatively coupled to apply the pulse train to an H bridge circuit in the IGBT module, which is coupled to pass a conditioned line voltage to the tri-phase motor in response to the PWM pulse train applied to the H bridge circuit in the IGBT module.

Abstract: A system to control an asynchronous tri-phase motor where said system comprises: at least one filter directly coupled to the current of the Alternative Current (AC) line; a rectifier which rectifies the line current, a doubler which reduces the curl, elevates the voltage and delivers a voltage in Direct Current, a braking resistance which helps to dissipate energy when the system is in braking mode, a shunt resistance, which helps to measure the current which flows from the V-line between the doubler and the IGBT module, a source, which adapts the voltage which the microcontroller consumes and peripheries (operational amplifiers, detectors, etc.

Abstract: A process for automatically controlling water level in a washing machine having a motor drive coupled to energize a motor that drives the agitator is provided. The process allows for selecting a target water level based on one or more water-level selection signals. The method further allows for measuring a parameter indicative of the water level based on an actual inertial response of the agitator. A comparing step allows for comparing the actual agitator inertial response against a target agitator inertial response, and a selecting step allows for selectively actuating one or more water valves for allowing passage of water so as to adjust the water level of the washing machine based on deviations between the actual agitator inertial response and the target agitator inertial response.

Abstract: A process and system for controlling respective agitator motion patterns in a washing machine having a motor drive coupled to energize a motor that drives the agitator is provided. The process allows for selecting a desired agitator motion pattern based on one or more pattern selection signals. The process further allows measuring one or more parameters indicative of the actual agitator motion pattern. A comparing step allows for comparing the actual agitator motion pattern against the desired agitator motion pattern, and an adjusting step allows for adjusting one or more control signals supplied to the motor drive for correcting deviations between the actual agitator motion pattern and the desired motion pattern.

Abstract: A cooling system for compartments that keep the relative humidity of products in refrigeration, characterized because it has a contact duct by means of a heat transfer plate, applied to the functioning of a two-door and two-compartment refrigerator with independent temperature regulation between the two compartments, refrigerator and freezer. The compartments are separated and the air is not mixed, thus the refrigerator compartment dehydrates less the food contained therein.