Whirlpool S.a.

Empresa Brasileira De Compressores S.a. - Embraco

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

Empresa Brasileira De Compressores S.a.

Whirlpool S.a.; Fundacao Universidade De Estado De Santa Catarina—udesc

Fundação Universidade Do Estado De Santa Catarina - Udesc

Paulo Sergio Dainez

Dietmar Erich Bernhard Lilie

Marcos Guilherme Schwarz

Marcio Roberto Thiessen

Nerian Fernando Ferreira

Marcelo Knies

Ademir Nied

Luiz Von Dokonal

Márcio Roberto Thiessen

Dietmar Erich Bernhard Lillie

Jose De Oliveira

José De Oliveira

Nerian Fernando Ferrelra

An actuation system for a resonant linear compressor (), applied to cooling systems, the latter being particularly designed to operate at the electromechanical frequency of said compressor (), so that the system will be capable of raising the maximum power supplied by the linear actuator, in conditions of overload of said cooling system. Additionally, an actuation method for a resonant linear compressor () is disclosed, the operation steps of which enable one to actuate the equipment at the electromechanical resonance frequency, as well as to control the actuation thereof in over load conditions.

Actuation system for a resonant linear compressor, method for actuating a resonant linear compressor, and resonant linear compressor

An actuation system for a resonant linear compressor () is disclosed, applied to cooling systems, the latter being particularly designed to operate at the electromechanical frequency of said compressor (), so that the system will be capable of raising the maximum power supplied by the linear actuator, in conditions of overload of said cooling system. Additionally, an actuation method for a resonant linear compressor () is provided, the operation steps of which enable one to actuate the equipment at the electromechanical resonance frequency, as well as to control the actuation thereof in over load conditions.

A method for protecting a resonant linear compressor () including structural resonance frequencies (w) and a motor that is fed by feed voltage (V) that has amplitude (A) and a drive frequency (w), both controlled according to the equation A&#xb7;sin(wt). The protection method is configured so as to include the step of preventing feed to the motor at drive frequencies (w) that have at least one harmonic coinciding tithe the structural resonance frequency (w) of the resonant linear compressor (). A protection system of a resonant linear compressor () includes an electronic control () configured to prevent feed to the motor at the drive frequencies (w) that have at least one harmonic coinciding with the structural resonance frequency (w) of the resonant linear compressor ().

Method and a system for protecting a resonant linear compressor

A control method and a system for controlling the piston of a resonant linear compressor including at least one electronic control unit, the electronic control unit including at least one observing electronic circuit and at least one control circuit associated to each other. The observing electronic circuit is configured for: measuring at least one electric magnitude of the electric motor; estimating at least one set of electric parameters and at least one set of mechanical parameters of the resonant linear compressor; and estimating and providing at least one control parameter of the system for the control circuit based on the measured electric magnitude measured and on the estimated set of electric and mechanical parameters. The control circuit is configured for actuating the electric motor from the at least one control parameter.

System for controlling a resonant linear compressor piston, method for controlling a resonant linear compressor piston, and resonant linear compressor

A linear motor (), a linear compressor (), a method of controlling a linear compressor (), a cooling system () and a system of controlling a linear compressor () to operate a linear compressor () in resonance in it's the greatest possible efficiency throughout its operation are described. One of the ways of achieving these objectives is by means of a linear compressor () applicable to a cooling system (), the linear compressor () comprising a piston () driven by a linear motor (), the piston () having displacement range controlled by means of a controlled voltage (V), the controlled voltage (V) having a voltage frequency (&#x3c6;) applied to the linear motor () and adjusted by a processing unit (), the range of piston () displacement being dynamically controlled in function of a variable demand of the cooling system (), the linear compressor () having a resonance frequency, the processing unit () adjusting the range of piston () displacement, so that the linear compressor () will be dynamically kept on resonance throughout the variations in demand of the cooling system ().

Linear motor, a linear compressor, a method of controlling a linear compressor, a cooling system, and a linear compressor controlling a system

A piston and cylinder combination driven by linear motor with cylinder position recognition system, including a support structure forming an air gap; a motor winding generating a variable magnetic flow along part of the air gap; a cylinder having a head at one end; a piston connected to a magnet, the magnet driven by the magnetic flow of the motor winding to move inside a displacement path including at least partially the air gap; the displacement of the magnet making the piston reciprocatingly move inside the cylinder; and an inductive sensor disposed at a point of the displacement path of the magnet, such that when the piston reaches a position of closest approach to the cylinder head, the inductive sensor detects a variation in the magnetic field resulting from the corresponding position of the magnet, and generates a voltage signal arising from this magnetic field variation.

Piston and cylinder combination driven by linear motor with cylinder position recognition system and linear motor compressor, and an inductive sensor

A linear compressor () applicable to a cooling system () includes a piston () driven by a linear motor (), the piston () having displacement range controlled by means of a controlled voltage (V), the controlled voltage (V) having a voltage frequency (&#x3c6;) applied to the linear motor () and adjusted by a processing unit (), the range of piston () displacement being dynamically controlled in function of a variable demand of the cooling system (), the linear compressor () having a resonance frequency, the processing unit () adjusting the range of piston () displacement, so that the linear compressor () will be dynamically kept on resonance throughout the variations in demand of the cooling system ().

A method of detecting impact or collision between a cylinder () and piston () driven by a linear motor of a gas compressor includes the steps of: i) obtainment of a reference signal (Sr) associated to an electrical output of the linear motor before the piston attains the upper dead center; ii) obtainment of a detection signal (Sd) associated to the electrical output of the linear motor after the piston attains the upper dead center; iii) comparison between the reference signal (Sr) and the detection signal (Sd); and iv) record of occurrence of impact when the result of comparison of step iii indicates that the detection signal (Sd) presents a variation deriving from impact between the cylinder and the piston, considering a pre-established tolerance. Also disclosed is an electronic detector device , a gas compressor () and a control system.

Method of detecting impact between cylinder and piston driven by a linear motor, detector of impact between a cylinder and piston driven by a linear motor, gas compressor, control system for a cylinder and a piston set driven by a linear motor gas compressor, control system for a cylinder and a piston set driven by a linear motor

The present invention relates to a system and method of controlling a linear compressor (), which is capable of fine-tuning the compressor when necessary, throughout the operating period of the compressor, so that said compressor operates at maximum capacity, wherein the piston () achieves a maximum displacement amplitude, closely approaching the cylinder head () without colliding with it. The system and the method according to the invention are also intended to control the operation of the linear compressor throughout its operating period, also seeking to maximize its performance and to reduce or optimize its power consumption. According to the present invention, the fine-tuning and control of the operation of the linear compressor are carried out by means of the combination of a technique for controlling a compressor without a sensor, and a technique for controlling the compressor with the aid of a sensor.

System and method of controlling a linear compressor

A linear compressor control system includes an electronic circuit controlling an electric motor that drive a piston of the compressor, such that the motor is operated intermittently with an on-time (t) and an off-time (t) to keep the compression capacity of the compressor substantially constant. The compressor is associated with a closed cooling circuit having an evaporator and a condenser. The off-time (t) is shorter than the time necessary for the evaporation pressure (P) in the evaporator and the condensation pressure (Pc) in the condenser to equalize each other after the compressor has been turned off.

Linear-compressor control system, a method of controlling a linear compressor and a linear compressor

A system and a method for protecting electric motors and their respective control circuits are described, wherein it is possible to distinguish whether a situation of surge current results from a overload or from a short-circuit on the motor (). This is achieved by means of a system for protecting an electric motor () and its control circuit (), the motor speed control being carried out by means of a set of switches (Ch), the system comprising a control central () capable of measuring the electricity conduction time (T) of each of the switches (Ch) and to measure the time (T) passed between the beginning of conduction of one of the switches (Ch) and the occurrence of a surge current, the central () making a comparison of said times (T, T) and being capable of determining whether said surge current results from an overload or a short-circuit of the electric motor () or on one of the switches (Ch). The invention also refers to a method for protecting an electric motor () and its control circuit (), the speed control of which is carried out by means of a set of switches (Ch), wherein the method comprises a step of measuring the electricity conduction time (T) of each of the switches (Ch), a step of measuring the time (T) passed between the beginning of conduction of one of the switches (Ch) and the occurrence of a surge current, and a step of comprising said times (T, T) and consequently determining whether said surge current results from an overload or from a short-circuit of the motor (). In addition, the present invention refers to an electric motor () that is controlled by a set of switches (Ch), the control of the switches (Ch) being carried out by a control central () capable of measuring and comparing said times (T, T).

System and a method for protecting an electric motor and its control circuit, and an electric motor

A method for controlling and protecting electric motors, specially permanent magnet motors electronically actuated by a control system. The system includes a three-phase inverting bridge, in which the position of the rotor can be monitored by using a position detector physically attached to the axle or through the tension induced in the coils by the magnet, in order to correctly control actuation by the control system. The present invention is also directed to a system for controlling electric motors and an electric motor system. The system includes continuously reading the position detector until a minimum expected time has passed. After the minimum expected time has passed, there is continuous reading of the position detector until a maximum expected time has passed to detect if a position change of the rotor is sensed.

Method for controlling and protecting electric motors, a system for controlling electric motors and an electric motor system

A system and method for controlling a compressor ( ) is provided that prevents the piston ( ) of the compressor from colliding against the valve system ( ) provided therein. The system and method of the present invention control the stroke of the piston ( ), allowing the piston ( ) to advance as far as the end of its mechanical stroke in extreme conditions of load, without allowing the piston ( ) to collide with the valve system ( ). The present invention controls the compressor ( ) by measuring a movement time of the piston ( ); comparing the movement time with a foreseen movement time; and altering the voltage (Vm) if the first movement time is different from the foreseen movement time, the foreseen movement time being such that the movement of the piston ( ) will reach a maximum point (M).

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Paulo Sergio Dainez