Method of Indirect Measurement of Linear Compressor Motor Specific Thrust and Mechanical Damping Coefficient

Abstract

The invention discloses a method for indirectly measuring motor specific thrust and a mechanical damping coefficient of a linear compressor. The method comprises the following steps of connecting an acoustic load to an outlet of the compressor; pressurizing a whole system; finding out corresponding running frequency of the linear compressor when electric-acoustic conversion efficiency is maximum at the time by adjusting the running frequency of the linear compressor; adjusting an acoustic impedance real part under the running frequency condition; finding out the current compressor maximum electric-acoustic conversion efficiency and the corresponding acoustic impedance real part at the time by detection; and calculating to obtain the motor specific thrust and the mechanical damping coefficient. By the method, the motor specific thrust alpha and the mechanical damping coefficient Rm of the linear compressor can be detected simply. Compared with the existing testing method, the method has the advantages that the compressor can be indirectly tested on the premise that the linear compressor does not need to be disassembled, the testing method is simple and is easy to operate, and the circumstance that components of an inner structure are damaged due to disassembling of the compressor is avoided.

Description

technical field [0001] The invention belongs to the field of linear compressors, and in particular relates to an indirect measurement method for the specific thrust of a linear compressor motor and the mechanical damping coefficient. Background technique [0002] Due to the combination of key technologies such as linear motors, flexible leaf springs, and gap seals, linear compressors have a series of advantages such as long life, no friction, low vibration, low noise, and high reliability. They have been widely used in low-temperature refrigerators and refrigerators. . The linear compressor can be understood as composed of three major parts: the circuit part, the mechanical part and the acoustic load part. Among them, the specific thrust of the motor is the core key parameter of the circuit part, and its value determines the ability of the linear motor to convert electrical work into mechanical work. The mechanical damping coefficient is a key parameter of the mechanical p...

AI Technical Summary

Problems solved by technology

After the linear compressor has been running for a long time, due to some reasons, such as the change of the material properties of the motor, the offset of the mover stroke, etc., the specific thrust of the motor and the mechanical damping coefficient will change, which will affect the output characteristics of the compressor.

If you need to measure these two parameters at this time, you need to disassemble the compressor, which is inconvenient

In addition, since the seal of the linear compressor relies on the micron-level gap between the piston and the cylinder, it also makes its assembly extremely difficult

And in some occasions, the lack of the above-mentioned measuring devices makes it difficult to obtain parameters

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