Whirlpool S.a.

Embraco-industria De Compressores E Solucoes Em Refrigeracao, Ltda.

Empresa Brasileira De Compressores S.a. - Embraco

Roberto Andrich

Dietmar Erich Bernhard Lilie

Marcos Guilherme Schwarz

Claudio Eduardo Soares

Luiz Von Dokonal

Fabio Henrique Klein

Günter Johann Maass

Daniel De Figueiredo Maria

A method for actuating a semi-commanded valve that acts in synchronism with the compression cycles of an alternative compressor, and a system for actuating a multi-suction alternative compressor semi-commanded valve. The method for actuating the semi-controlled valve may involve detecting at least one compression peak in the course of at least one mechanical cycle of the alternative compressor and switching the functional status of at least an alternative compressor semi-commanded valve based on detecting at least one compression peak in the course of at least one mechanical cycle of the alternative compressor.

Method for actuating semi-commanded valve and system for actuating semi-commanded valve for multi-suction alternative compressor

A method for actuating a semi-controlled valve that acts in synchronism with the compression cycles of an alternative compressor, and a system for actuating a multi-suction alternative compressor semi-controlled valve. The method for actuating the semi-controlled valve involves detecting at least one compression peak in the course of at least one mechanical cycle of the alternative compressor and switching the functional status of at least an alternative compressor semi-controlled valve based on the detection.

A method for detecting an improper opening of a multiple suction reciprocating compressor suction valve of a reciprocating compressor includes monitoring, by an electronic processing core, a variable proportional to torque of an electrical engine that cooperates with a piston of the reciprocating compressor, the variable being measured by a sensor. A detection of the improper opening of the suction valve is made by a detection of at least one peak of the variable proportional to torque of the electrical engine during power of the electromagnetic field generator element.

Improper opening detection method of multiple suction reciprocating compressor suction valve

The present invention refers to a system and method for checking the operational status of alternative compressor valve and more particularly for checking operational status of electrically commanded valves, provided in alternative compressors used in refrigeration systems. In accordance with the present invention, said operational checking system of alternative compressor valve comprises a data processing core () capable of estimating one among two possible operations statuses of said metal valve () by varying at least one electric parameter provided by said sensor (), wherein said step of estimating one among two possible operational statuses of said metal valve () is effected on the basis of the results from the comparison between said signal of electric parameter from sensor () and the predetermined range of data analogous to the electric parameter.

Operational status checking system of alternative compressor valve and method for checking operational status of alternative compressor valve

The present application relates to an anticipatory control system and method for electric motor applied to cyclic loads, said system including an electric motor (), at least an electronic control unit (), at least an electronic power unit (), and at least an electric position-monitoring device. The electric motor () is electrically driven by the electronic power unit (), the electronic power unit () is electrically controlled by the electronic control unit (), the system includes an average speed controller and a device for monitoring the position of the electric motor, both implemented by the electronic control unit (). The speed controller is designed to monitor an average speed of the electric motor (), the position-monitoring device is designed to monitor and store an instantaneous speed (V) in each position of the electric motor () and estimate, for each position, an instantaneous control speed (V) of the electric motor (), the electronic control unit () is designed to calculate an average voltage (V) from the average speed monitored, and the electronic power unit () is designed to drive electrically the electric motorby a control voltage value (V). This control voltage value (V) is calculated by multiplying the average voltage (V) by the result of the division of the instantaneous control speed (V) by the average speed.

Anticipatory control system for electric motor and anticipatory control method for electric motor applied to cyclic loads

The present application refers to a system and a control method especially applied to electric motors designed to drive cyclical loads. The present system includes an electric motor (), at least an electronic control unit () and at least an electronic power unit (), the electric motor () is electrically driven by the electronic power unit (), the electronic power unit () being electrically commanded by the electronic control unit (), the system including an average speed controller implemented by the electronic control unit (), the average speed controller being arranged to monitor an instantaneous speed (V) of the electric motor () and provide an average speed value of the motor (), the electronic control unit () being arranged to calculate an average voltage (V) based on the average speed obtained, the electronic power unit () being arranged to electrically drive the electric motor () by an instantaneous voltage value (V), this instantaneous voltage value (V) being calculated by multiplying the average voltage (V) by the result of the division between the instantaneous speed (V) and the average speed.

Control system for electric motor applied to cyclic loads and control method for electric motor applied to cyclic loads

The present invention relates to a control system for protection against breakage of the lubricating-oil film in the bearings of hermetic compressors, as well as to a control method that has the objective of guaranteeing that a variable-capacity compressor should be maintained above a minimum rotation in order to prevent the oil film close to the respective bearing from breaking. One of the forms of achieving the objectives of the present invention is by means of a control system for protection against break of the lubricating-oil film in bearings of hermetic compressors, a microprocessor () actuating a set of switches (SWM) selectively, so as to generate a rotation at the motor-compressor assembly (), the compressor () having a minimum rotation (RPMmin) of the compressor () so that the oil film will not be broken.

Control system and method for protection against breakage of lubricanting-oil film in compressor bearings

A system of controlling an electric motor, a digital method of controlling an electric motor and an electric motor are described. The system of controlling an electric motor of N phases comprises a microcontroller (), an A/C converter () associated to the microcontroller (), a set of voltage meters (D) associated to the A/D converter (), a set of switches (SW) connected to an electric voltage (V) and associated to the microcontroller (), the microcontroller () selectively feeding, by means of at least two switches (SW) two phases (F) of the motor () with the voltage (V) during a period of time (T), the movement of the motor inducing the electric voltages (E), the set of meters (D) measuring the signals of electric voltages (f) and comparing these voltages with each other to determine the period of time (T). One describes also the calculation of a parameter, called H(r), used to adjust the instants of commutation according to the constructive type of the motor. The parameter depends upon the rotation of the motor. One also foresees the use of a digital filtering technique, to eliminate the effects of the modulation on the control method. The filtering is characterized by the arithmetic mean of the last k samples of each average electric voltage (f), these samples being synchronized with the period of modulation.

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Roberto Andrich