Abstract: The invention concerns a linear compressor (1), particularly a refrigerant compressor, with a compression unit (3) having a cylinder (8) and a piston (16) reciprocating in the cylinder (8), and a linear motor (4) having an outer stator (18), an inner stator (20) and an armature (22) located in a gap (21) formed between the outer stator (18) and the inner stator (20), the armature (22) being connected to the piston (16) via a piston rod (28). It is endeavoured to design such a linear compressor in a simple manner with the smallest possible dimensions. For this purpose, it is ensured that the armature (22) is connected to the piston rod (28) inside the axial length of the inner stator (20).

Abstract: The invention concerns a linear compressor, particularly a refrigerant compressor, with a housing (2, 2?) and a compression unit, which comprises a compressor with a piston and a cylinder as well as a linear motor driving the piston in relation to the cylinder along a movement axis, the compression unit (30) being connected to the housing (2) via a spring arrangement (7). It is endeavoured to provide a space saving support of the compression unit (30) in the housing that enables good vibration suppression. For this purpose, the spring arrangement comprises a spring (6, 7), which is curved in the circumferential direction in relation to the movement axis (50), said spring surrounding the compression unit (3-5) on at least a share of its circumference.

Abstract: The invention concerns a linear compressor (1), particularly a refrigerant compressor, with a linear motor (4), which comprises an outer stator (18), an inner stator (20) and an armature (22) located in a gap (21) between outer stator (18) and inner stator (20), and a compression unit (3), which has a cylinder (8) and a piston (16) reciprocating in the cylinder (8) and being connected to the armature (22). It is endeavoured to simplify the design of the compressor. For this purpose, the inner stator (20) and the outer stator (18) are held and positioned in relation to each other at both axial ends by means of motor covers (29).

Abstract: The invention concerns a linear compressor (1) with a piston (16) reciprocating in a cylinder (8), a linear motor acting upon the piston (16) and a resonance spring arrangement (5) connected with the piston (16). It is endeavoured to reliably avoid damaging the compressor during operation. For this purpose, the resonance spring arrangement (5) has a fixed stop (48) allocated to the upper dead point of the piston (16).

Abstract: The invention concerns a linear compressor (1), particularly a refrigerant compressor, with a first component group comprising a stator (18, 20) of a linear motor (4) and a cylinder (8, 10), a second component group comprising a reciprocating piston (16) and an armature (22) of the linear motor (4) as well as a piston rod (28) connecting the armature (22) to the piston (16), an oil sump in a housing (2) and an oil pump (38), the second component group being movable in relation to the first component group. It is endeavoured to provide a simple design ensuring a lubrication of the linear compressor. For this purpose, the oil pump (38) has a pump housing (40) that is permanently connected to the piston rod (28), the pump housing (40) immersing with at least one suction opening (43; 43a, 43b) into the oil sump (41), the oil pump (38) supplying oil to the inside of the piston rod (28).

Abstract: A method for starting a battery driven motor, wherein an input voltage is measured continuously. In case the input voltage becomes smaller than a predefined minimum voltage the attempt to start the motor is stopped and the maximum permitted current level to be supplied from the battery to an electronic unit of the motor is lowered before the next attempt. This is repeated until the input voltage is larger than the minimum voltage and the motor is no longer in start-up mode. The method protects the battery from collapsing. The method is suitable for starting battery driven motors for driving compressors. The number of attempted start-up sequences may be counted and on the basis of this it may be determined that the battery is weak or that the wiring is misdimensioned. Furthermore, a control system for controlling starting of a motor.

Abstract: The invention concerns a piston arrangement having a piston with a piston head and a piston skirt with a circumferential surface, and a connecting rod, which is connected with the piston via a ball joint comprising a ball, and penetrated by an oil supply channel, which is connected with a bearing surface of the ball joint.

Abstract: The invention concerns a method for controlling a direct voltage source with a first direct voltage source (2) and a voltage monitoring device (24), which monitors an output voltage of the first direct voltage source (2) and acts upon a control device (31), the control device (31) controlling the working state of the first direct voltage source (2). Further, the invention concerns a voltage supply device (22) with which the method can be used. In this connection it is endeavoured to reduce the risk of an increase in voltage in a circuit with several direct voltage sources. For this purpose, a second direct voltage source (3) produces a voltage change at the voltage monitoring device (24).

Abstract: The invention concerns a piston arrangement having a piston with a piston head and a piston skirt and a connecting rod, which is connected with the piston via a ball joint arrangement comprising a ball, the ball being held in the piston by means of a safety element.

Abstract: The invention concerns a compressor crankshaft (1), particularly a refrigerant compressor crankshaft, with a hollow shaft element (2), a crank pin (3) arranged eccentrically to the shaft element (2) and a transition element (4) between the shaft element (2) and the crank pin (3). It is endeavoured to reduce the manufacturing costs. For this purpose, the shaft element (2) has at least two shaft sections (5, 6) joined in a telescope-like manner, which engage in each other in an overlapping area (7).

Abstract: The invention concerns a stator for a line-start electric motor, with a rotor accommodating chamber, in which a rotor is accommodated to be rotatable, and which has accommodating chambers for conducting rods and accommodating chambers for permanent magnets, and with a stator winding comprising several windings, which, during operation of the line-start electric motor under the influence of the rotor, generate a magnetic field with a main axis. In order to increase the efficiency of the line-start electric motor, the rotor accommodating chamber has no constant inner radius, but, in the area of a vertical to the main axis, has a larger inner radius than in the adjacent areas.

Abstract: The invention concerns a method for mounting a drive shaft (19) of a compressor, particularly a hermetical refrigerant compressor, which has a motor with a stator (1) and a rotor (23), connected with the drive shaft (19) and located in a rotor opening (4) of the stator (1), a first bearing support (8) and a second bearing support (29) being connected with the stator (1), a first bearing (15) for the drive shaft (19) being mounted in the first bearing support (8) and a second bearing (28) for the drive shaft (19) being mounted in the second bearing support (29). It is endeavoured to provide a method for mounting a drive shaft, in which the use of components with relatively large manufacturing tolerances will still result in a good alignment of the drive shaft in relation to the stator. For this purpose, at least the first bearing support (8) is provided with a positioning stop for the first bearing (15) after mounting the first bearing support (8) on the stator (1).

Abstract: The invention relates to a rotor for an electric motor, especially an electric line-start motor, comprising spaces (4 to 7) which receive permanent magnets (10 to 13) and extend in an axial direction, and spaces (20 to 25) that accommodate conductor rods and extend in an axial direction. In order for the rotor to run as regularly as possible, the spaces (20 to 25) accommodating the conductor rods are provided with a substantially elongate cross-section in at least one sector of the rotor while being embodied in a curved manner along the longitudinal axis thereof in said sector when viewed from a cross-sectional perspective.

Abstract: The invention provides a rotor for an electrical motor. The rotor comprises both a squirrel cage and a number of magnets and can be inserted e.g. in a line-start motor. To secure the magnets in cavities in a core of the rotor, an end plate is attached to one axial end face by rivet means, and to simplify manufacturing of the rotor, the rivet means forms part of at least one of the short circuit rings of the squirrel cage.

Abstract: The invention provides a rotor for an electrical motor, a tool for making a rotor core and a method of making the rotor. The rotor could be incorporated e.g. in a line-start motor and comprises a squirrel cage and magnet located in a rotor core. The magnets are, in one end of the rotor, secured by an end plate with apertures which are larger than the magnet openings, and the end plate is indexed relative to the magnet slots such that a first portion of openings into the magnet slots is in communication with the aperture and such that a remaining, second, portion of the magnet slots is covered by the end plate. In one aspect, the end plate forms an integrated part of the rotor core and comprises openings cooperating with conductor slots to form through-going passages for conductors of the squirrel cage. In that way, the end plate is held in a completely fixed position by the squirrel cage which is moulded directly onto the core and into the conductor slots.

Abstract: The invention concerns a piston compressor cylinder arrangement (1), particularly for a hermetically enclosed refrigerant compressor, with a cylinder body (2) and a cylinder head arrangement (7), the cylinder body (2) having a first front side (6) in the area of the cylinder head arrangement (7) and a second front side (8) at the other end. It is endeavoured to manufacture such a cylinder arrangement in a cost-effective manner without having to fear for a deformation during mounting. For this purpose, a cup-shaped mounting sleeve (9) surrounds the cylinder body (2) over its full axial working length with a radial distance on all sides.

Abstract: The invention concerns a piston compressor (1), particularly a hermetical refrigerant compressor, with a compression chamber (2), which is bordered by a cylinder (3), a piston (4) and a valve plate arrangement (5), which has a suction valve arrangement (14, 15) and a pressure valve arrangement (16, 17). It is endeavoured to provide a piston compressor with a good efficiency. For this purpose, it is ensured that the suction valve arrangement (14, 15) opens into the compression chamber (2) in a central area of the cylinder (3) and the pressure valve arrangement (16, 17) has a plurality of pressure openings (16), which are located in an annular area surrounding the suction valve arrangement (14, 15).

Abstract: The invention relates to a piston compressor, particularly a hermetically enclosed refrigerant compressor, with a crank drive, having a crank shaft with an eccentric crank pin and an oil channel arrangement, and a connecting rod with a first piston-side connecting rod eye and a second pin-side connecting rod eye, said eyes having between them a connecting rod shank with a longitudinal channel, which opens into the connecting rod eyes. In this compressor, it is endeavoured to improve the lubricating conditions. For this purpose a bearing element is arranged between the crank pin and the second connecting rod eye, which is unrotatably connected with the second connecting rod eye under formation of an oil channel, the longitudinal channel communicating with the oil channel and a control arrangement being provided, which ensures a communication between the oil channel and the oil channel arrangement at least once per rotation of the crank pin.

Abstract: The invention concerns a method for mounting a drive shaft (19) of a compressor, particularly a hermetical refrigerant compressor, which has a motor with a stator (1) and a rotor (23), connected with the drive shaft (19) and located in a rotor opening (4) of the stator (1), a first bearing support (8) and a second bearing support (29) being connected with the stator (1), a first bearing (15) for the drive shaft (19) being mounted in the first bearing support (8) and a second bearing (28) for the drive shaft (19) being mounted in the second bearing support (29). It is endeavoured to provide a method for mounting a drive shaft, in which the use of components with relatively large manufacturing tolerances will still result in a good alignment of the drive shaft in relation to the stator. For this purpose, at least the first bearing support (8) is provided with a positioning stop for the first bearing (15) after mounting the first bearing support (8) on the stator (1).

Abstract: The invention concerns a rotor arrangement for an electrical drive motor of a compressor, particularly a refrigerant compressor, with a rotor (15) having a rotor lamination (20) of stacked sheet plates, and a shaft (8), which is inserted in an axial recess (18) of the rotor lamination (20) and is unrotatably connected with the rotor lamination (20), the recess (28) being formed by openings in adjacent sheet plates (23, 25). It is endeavoured to simplify the manufacturing of such rotor arrangements. For this purpose, it is ensured that openings (24, 26) of different sizes are provided in the sheet plates (23, 15) at least two sheet plates (23) forming a first group, each having an opening (24), which is smaller than the cross-section of the shaft (8), the remaining sheet plates (25) forming a second group, each having an opening (26), which is larger than the cross-section of the shaft (8).