Abstract: A system for operational acoustic optimization of a variable speed compressor (2) includes a motor (6), a frequency inverter (3), and a control block (5). The frequency inverter (3) is electrically connected to the synchronous motor (6), an electrical network (4), and the control block (5). The control block (5) is configured to control the speed of the motor (6) and to establish a first switching frequency (F1) and a second switching frequency (F2) of the frequency inverter (3). The frequency inverter (3) is configured to start the variable speed compressor (2) by supplying motor (6) with a signal (9) with the first switching frequency (F1) for the duration of a time period (T1) corresponding to at least one alignment operation period of the motor (6) and to supply the motor (6) with a signal (9) with the second switching frequency (F2) after the time period (T1).

Abstract: The present invention refers to a starting method with two-levels modified and discrete fixed-time or fixed-frequency hysteresis current controller, under high load conditions, of a BLDC motor (10) with trapezoidal-shaped induced voltages, wherein the BLDC motor (10) is driven by an inverter bridge (30) with only one current sensor (20) positioned in the busbar, controlled by means of a processing unit associated to an analog-digital converter, wherein the novelty basically comprises the fact that: the intensity of the BLDC motor current (Im) is controlled by means of the two-levels and discrete fixed-time or fixed-frequency hysteresis current controller.

Abstract: This invention refers to a rheostatic braking method, applied on a BLDC motor (10) used in hermetic compressors, comprising: selecting a first phase and a second phase, connected to the BLDC motor (10), which will be short-circuited, at a certain electric position of the BLDC motor (10), wherein the first phase and the second phase selected are the phases having the major induced voltage and the minor induced voltage at a certain electric position of the BLDC motor (10); maintaining a third open phase to monitor the electric position of the BLDC motor (10) by means of monitoring the induced voltage at this third open phase; and separating the rheostatic braking in six electric positions, each electric position being associated to two electric sections: a first section before zero crossing of the induced voltage of the third open phase; and a second section after the zero crossing.

Abstract: A positioning process of a piston of a reciprocating compressor is applied before the beginning of a start procedure of a BLDC motor. The reciprocating compressor includes the BLDC motor having a rotor associated mechanically to the piston; a frequency inverter; a current sensor; and a processing unit having a current controller and a command unit. The switches are driven by the processing unit to control the currents applied to the phases of the motor. In each new step of the process, the value of an initial current is higher or equal to the value of the initial current of a previous step; and the value of a maximum current is higher or equal to the value of the maximum current of the previous step. The process includes adjusting the current at each position to avoid the return of the piston and mechanical oscillation in each new step.

Abstract: Method of accelerated extinguishing of residual current of a phase that opens when changing an electric position during the driving of a BLDC motor (10), under high load conditions, comprising: using the unipolar pulse width modulation pattern ON_PWM to drive the BLDC motor (10); determining if there is residual current by means of monitoring the voltage of the phases that opens using a voltage observer (40); while there is residual current, applying a switching pattern, on the switches (S1-S6) of the BLDC motor (10), which superimposes the pulse width modulation pattern used and maximizes the voltage in the open phase for the accelerated extinguishing of said residual current, said switching pattern comprising: opening the switch of the phase maintained driven when changing the electrical position; and closing the switch related to the phase that was driven when changing the electric position.

Abstract: The present invention relates to a system and method for operational acoustic optimization of a variable speed compressor (2) comprising a synchronous motor (6), a frequency inverter (3) and a control block (5), such optimization being carried out by modifying the switching frequency of the supply signal (9) of the motor (6) contained in the compressor (2), via a control block (5), only during the aligmnent phase of the motor (6), thus, not impairing the performance of the compressor (2), the thermal management of the inverter (3) and the acoustic performance of the system.

Abstract: A method and system for identifying a failure in a compressor of a cooling system by implementation of a failure identification logic and a braking logic based on monitoring at least one of an electrical quantity and a mechanical quantity and comparing these quantities with compatible parameters and possible subsequent braking based on this comparison. A cooling system compressor, cooling system, and refrigerator are also disclosed.

Abstract: The present application relates to an anticipatory control system and method for electric motor applied to cyclic loads, said system including an electric motor (10), at least an electronic control unit (20), at least an electronic power unit (30), and at least an electric position-monitoring device. The electric motor (10) is electrically driven by the electronic power unit (30), the electronic power unit (30) is electrically controlled by the electronic control unit (20), 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 (20).

Abstract: The present application refers to a system and a control method especially applied to electric motors designed to drive cyclical loads.

Abstract: The present application relates to an anticipatory control system and method for electric motor applied to cyclic loads, said system including an electric motor (10), at least an electronic control unit (20), at least an electronic power unit (30), and at least an electric position-monitoring device. The electric motor (10) is electrically driven by the electronic power unit (30), the electronic power unit (30) is electrically controlled by the electronic control unit (20), 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 (20).

Abstract: The present application refers to a system and a control method especially applied to electric motors designed to drive cyclical loads.