A method for operating a linear compressor of an appliance, such as a refrigerator appliance, is provided. In one example implementation, the method can include operating a motor of the linear compressor in order to drive a rotor of the motor. The method can further include obtaining, via a controller of the linear compressor, one or more feedback measurements of one or more electrical characteristics of the motor. The method can further include controlling, based at least in part on the one or more feedback measurements, the motor of the linear compressor using a single-phase vector-like control scheme.

A rotary compressor includes: a case; a cylinder inside the case and has an internal space, and which includes a rolling piston configured to eccentrically rotate in the internal space, a vane in contact with the rolling piston such that while the vane is in contact with the rolling piston, the internal space of the cylinder is divided into a suction chamber and a compression chamber, a suction port to allow refrigerant to flow to the suction chamber, and a discharge port to allow the refrigerant to be discharged the compression chamber; a drive device that includes a rotation shaft connected to the rolling piston and a motor configured to rotate the rotation shaft; and a valve member that is fixed to a side surface of the vane and selectively opens and closes the discharge port as the vane reciprocates back and forth.

A positive displacement machine includes a case including a tubular guide part in which a pressure chamber is provided, a slide member including a shaft extending in a first direction and a piston provided at an end portion of the shaft and disposed in the guide part, a coupling member coupled to the slide member and extending in a second direction intersecting the first direction, a first rotating member coupled to one end of the coupling member and configured to rotate around a first rotation axis extending in the second direction, and a rocking absorbing mechanism configured to absorb a rocking motion of the piston around an axis extending in the first direction. The rocking absorbing mechanism is provided between the coupling member and the slide member, between the shaft and the piston, or between the piston and an inner wall of the guide part.

Refrigerant compressor for refrigeration systems, comprising an electric motor, at least two cylinder banks and a mechanical performance control unit for activating and deactivating at least one of the cylinder banks in order to activate or deactivate its refrigerant output, wherein, for the purpose of operation in partial performance conditions, the refrigerant compressor is operable in at least two different operating modes, of which each provides an activation or deactivation of the cylinder banks that is different from the other operating modes, wherein associated with the refrigerant compressor is a frequency converter for controlling the speed of the electric motor, wherein associated with the refrigerant compressor is an operating condition controller that, in accordance with a performance request signal supplied to it for operation of the refrigerant compressor in the partial performance condition corresponding to this performance request signal, operates the refrigerant compressor in an operating mode that is selected from at least two different operating modes and at a speed adapted to the selected operating mode, for the purpose of achieving this partial performance condition.

A damped compressor used in mobile appliances. The appliances may comprise a compressor which is disposed within a housing and is in fluid communication with a refrigerant system. Within the housing there is an improved damping or stabilizer system which limits movement of electric or mechanical portions, or both, of the compressor within the housing. At startup and shutdown, when oscillations of the components within the housing are generally maximized, the components are limited from contacting the housing internal structure so as to inhibit damage to the compressor and reduce the noise associated with such contact. The components are also damped from movement associated with the mobile application of the compressor.

A linear motor for a compressor having asymmetric load characteristics in both directions of a stroke, improves the service life of a bearing, and reduces a total length of a system. The linear motor includes a movable element having a magnetic pole frame and a plurality of field element poles, and a plurality of magnetic pole teeth around which windings are wound and that are provided so as to sandwich the movable element, and the movable element and the magnetic pole teeth are relatively displaced. The plurality of field element poles include primary magnets arranged between the plurality of magnetic pole teeth and secondary magnets arranged externally relative to spaces between the plurality of magnetic pole teeth in either direction of the relative displacement. A neck part of the magnetic pole frame connected to a bearing is arranged externally in the other direction of the relative displacement direction.

A refrigerating apparatus using a non-azeotropic mixed refrigerant may include a compressor operable in a continuous operation mode and configured to compress the non-azeotropic mixed refrigerant, a condenser configured to condense the refrigerant compressed by the compressor, an expander configured to expand the refrigerant condensed by the condenser, and an evaporator configured to evaporate the refrigerant expanded by the expander. A pressure difference (P) of the non-azeotropic mixed refrigerant has a value included in a range of 340 kPa<P<624.7 kPa. Therefore, reliability of components, such as a piston, in the refrigerating apparatus using the non-azeotropic mixed refrigerant may be further improved.

A refrigerant compressor group for a refrigeration system that includes least two piston compressors operating in parallel between a common low-pressure connector and a common high-pressure connector. To adjust it to different requirements, in a refrigerant compressor group, a variable overall mass flow throughput in the refrigerant compressor group is adjustable. For at least one of the piston compressors, its mass flow throughput is adjustable by speed selection using a frequency converter for the electric motor. For at least one of the piston compressors, its mass flow throughput is adjustable by cylinder selection. An operating condition controller for the refrigerant compressor group is provided which, on the basis of a performance request signal of the refrigeration system that is transmitted to the operating condition controller, controls the overall mass flow throughput by open or closed-loop control by predetermining the cylinder selection and the speed selection.

The grouped mechanical liquid piston heat pump (1) comprises a blind liquid cylinder (8) of compressors in which a double-acting hydraulic piston (10) of compressors translates to form a first and a second compressor hydraulic variable volume (12, 134), and a blind liquid cylinder (30) of expanders in which a double-acting hydraulic piston (39) of expanders translates to form a first and a second expander hydraulic variable volume (44, 46), said hydraulic variable volumes (12, 134, 44, 46) communicating with compressor and expander gas and liquid reservoirs (14, 29, 50, 55) in which compressor and expander heat exchange and accumulation means (16, 59, 139, 70) are housed, this to form a compressor (3) and an expander (4).

Disclosed is a resonant expander usable in a cryogenic cooling system. The resonant expander may comprise an expansion chamber with a reciprocating piston. The piston divides the expansion chamber into a warm and a cold displacement volume. Passive acoustic valves allow high-pressure fluid into the cold displacement volume and allow low-pressure fluid out of the cold displacement volume. The low-pressure fluid may cool at exiting the resonant expander. The piston free from solid contact with an external mechanism, thereby not requiring sliding seals. Piston and displacement volumes form a mechanically resonant system at the operating frequency of the resonant expander, ensuring correct acoustic valve actuation. Electromagnetic system having a permanent magnet assembly fixed to the piston and a coil at the expansion chamber with a control system, is disclosed. Disclosed is a cryogenic cooling system having the resonant expander, a compressor and recuperative heat exchanger providing low temperature fluid.