Linear drive with a reduced axial force component, as well as a linear compressor and refrigerator

Abstract

The invention relates to a linear drive (1) comprising a stator (2) and an axis (3), a rotor (7) which moves in a reciprocating manner, with the stator (2) having a magnetic field guide core (4) with legs (5, 6) with the legs (5, 6) each having a foot (8, 10) which extends essentially towards the rotor (7), with at least one foot (8, 10) having an inclined surface (9), or having a plurality of magnets (22, 23) which are arranged one above the other in the direction of the axis (3), with the respective lengths (L2) of the magnets (22, 23) along the axis (3) and the respective widths (B1) of the legs (5, 6) along the axis (3), and / or the respective distances (A1) between the legs (5, 6) along the axis (3) differing such that force components of the rotor 7 along the axis (3) are reduced when no current is found in the linear drive (1), as well as a linear compressor,; a refrigerator and a method for cooling and / or for compressing a fluid. The invention is distinguished in that undesirable force components along the axis (3) are reduced by the configuration of the foot (8, 10) with an inclined surface (9) and by a suitable choice of the lengths, widths and distances, thus allowing better open-loop and / or closed-loop control of the reciprocating movement of the rotor (7).

Description

technical field [0001] The invention relates to a linear drive comprising a stator and a moving part movable back and forth along an axis in the stator, said stator having a magnetizable magnetic field guiding core with legs each extending separately There is a foot generally towards moving parts; a linear compressor; a refrigeration device, in particular a refrigerator and / or freezer or air conditioning system; and a method for cooling items or compressing fluids. Background technique [0002] A linear drive with permanently energized moving parts is selectively moved by applying suitable currents to excitation coils on the stator to appropriately energize them. The coil magnetic field is guided by a magnetizable field-guiding core with poles and concentrated in the area around the moving part. [0003] DE69901586T2 discloses an electromagnetic linear actuator comprising a stator structure with two poles excited by at least one electrical winding. The moving member has a ...

AI Technical Summary

Problems solved by technology

[0004] The problem with existing solutions is that the moving parts are difficult to drive precisely, especially their back and forth movement cannot be controlled with the required precision

Although such braking operations are effective in preventing compressor piston slamming, they are disadvantageous if the highest possible operating efficiency is desired, since the braking energy will be lost to the system

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