Linear compressor

Abstract

A linear compressor is provided. The linear compressor may include a cylinder that forms a compression space for a refrigerant, a piston that reciprocates in an axial direction inside of the cylinder, and a linear motor that supplies power to the piston. The linear motor may include an outer stator including a first stator magnetic pole, a second stator magnetic pole, and an opening defined between the first stator magnetic pole and the second stator magnetic pole; an inner stator disposed apart from the outer stator to form an air gap therebetween; and a permanent magnet movably disposed in the air gap between the outer stator and the inner stator and having three poles. The three poles may include two end magnetic poles, and a central magnetic pole disposed between the two end magnetic poles. The piston may be moveable by a stroke between a top dead center position and a bottom dead center position, and a length of the first stator magnetic pole or the second stator magnetic pole may be greater than a length of the stroke.

Description

technical field [0001] The present invention relates to linear compressors. Background technique [0002] Generally speaking, a compressor (Compressor) is widely used as a mechanical device that receives power from a power generating device such as a motor or a turbine, and compresses air, refrigerant, or other working gases to increase the pressure. Appliances such as refrigerators and air conditioners or entire industries. [0003] This kind of compressor can be roughly divided into reciprocating compressor (Reciprocating compressor), rotary compressor (Rotary compressor) and scroll compressor (Scroll compressor). ) to form a compression space for sucking and discharging working gas, so that the piston performs linear reciprocating motion inside the cylinder, thereby compressing the refrigerant. The above-mentioned rotary compressor is between the eccentrically rotating roller and the cylinder. A compression space for sucking and discharging working gas is formed, and th...

AI Technical Summary

Problems solved by technology

At this time, the amount of magnetic flux generated in one magnet is not sufficient, and there is a problem that the amount (length or thickness) of the above-mentioned permanent magnet needs to be increased to supplement it.

[0012] In addition, the above-mentioned permanent magnets are formed of expensive rare earth magnets, so there is a problem that the more the amount of permanent magnets is required for the above-mentioned reason, the more the manufacturing cost of the above-mentioned linear compressor will increase rapidly.

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