A testing method and testing device for a linear motor

Abstract

The invention discloses a linear motor test method. The mover of the linear motor is in a fixed state, and an input voltage with a preset frequency is applied to the input end of the linear motor, and the effective value of the voltage, the effective value of the current, the active power and the reactive power of the input end of the linear motor are obtained. Work power, and increase the input voltage value and preset frequency value of the input terminal of the linear motor to obtain the equivalent resistance and equivalent reactance corresponding to the single frequency of the linear motor and the equivalent resistance and equivalent reactance corresponding to the full frequency of the linear motor. Also disclosed is a testing device for the linear motor. The invention calculates the preset frequency of the linear motor and the equivalent resistance and equivalent reactance at the full frequency by measuring the electrical parameters of the input end of the linear motor, so as to realize the equivalent stiffness, equivalent damping, and natural frequency of the linear compressor equipment. More accurate and real-time detection of dynamic parameters such as stroke and travel, used for online monitoring and analysis of compressors, fault diagnosis, judgment of piston top dead center position and performance analysis.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a testing method and testing device for a linear motor. Background technique [0002] The further improvement of energy efficiency standards for new household appliances has made linear compressors with significant energy-saving advantages an important development direction for compressors for small household or commercial refrigeration devices such as refrigerators, freezers, supermarket showcases, air conditioners, and electronic heat dissipation. The linear compressor integrates the linear motor and the piston of the compressor, and the linear motor directly drives the piston to reciprocate, thereby compressing the refrigerant vapor. This driving mode and structure makes the linear compressor save the link of converting the rotary motion to the linear motion compared with the traditional piston compressor using the rotary motor, reduces the power consumption of friction loss, i...

AI Technical Summary

Problems solved by technology

[0005] In the existing literature, the linear motor parameters (equivalent resistance and equivalent inductance) are usually treated as constants, but in the actual operation process, due to the nonlinear characteristics of the silicon steel sheet of the motor magnetic material, the motor parameters usually change with the frequency , and the use of linear motor parameters in the form of constants to calculate the motor consumption or stored energy has a large error, which further amplifies the calculation error of the control characteristic parameters such as the equivalent damping and stroke of the compressor, resulting in inaccurate control of the compressor and prone to cylinder collision. damage to the compressor

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