An Improved Method for Measuring the Rotational Speed of Hermetic Refrigeration Compressor
A technology of refrigeration compressor and measurement method, which is applied to devices using electric/magnetic methods, etc., can solve the problems of low measurement accuracy, poor environmental disturbance immunity, complicated measurement equipment, etc., and achieves strong disturbance immunity, low cost, The effect of eliminating distractions
Active Publication Date: 2019-11-05
ZHEJIANG UNIV OF TECH
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[0003] In order to overcome the defects of low measurement accuracy, poor environmental immunity and complex measurement equipment of the existing methods for measuring the rotational speed of hermetic refrigeration compressors, the present invention provides a method with high measurement accuracy, good environmental immunity and simplified measurement equipment. An improved measurement method for the rotational speed of a hermetic refrigeration compressor
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[0033] The present invention will be further described below in conjunction with the accompanying drawings.
[0034] refer to Figure 1 to Figure 7 , an improved method for measuring the rotational speed of a hermetic refrigeration compressor, the method for measuring comprises the following steps:
[0035] (1) Acquisition of current signals: use current-following sensors and high-speed data acquisition cards to collect motor power supply current;
[0036] (2) Data storage: use LabView to collect and store the digital signal after A / D conversion;
[0037] (3) Effective signal extraction based on Hilbert transform: digital signal processing for the collected data;
[0038] (4) Frequency domain conversion: Utilize chirp Z transformation to process signal, obtain frequency domain signal;
[0039] (5) Speed extraction: Aiming at the above frequency domain signals, extract the maximum value, and multiply the obtained frequency by 60 to get the compressor speed.
[0040] The m...
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An improved method for measuring the rotating speed of a hermetically sealed refrigeration compressor comprises the following steps of (1) current signal acquisition in which a current following sensor and a high-speed data acquisition card acquires supply current of a motor; (2) data storage in which LabView acquires and stores digital signals subjected to A / D conversion, (3) effective signal extraction based on Hilbert transform in which the digital data is processed for the acquired data; (4) frequency domain conversion in which linear frequency modulation Z-transform processes the signals to obtain a frequency-domain signal; (5) rotating speed extraction in which the maximum value of the above frequency domain signal is extracted, an obtained frequency is multiplied by 60 to be used as the rotating speed of the compressor. The improved method for measuring the rotating speed of a hermetically sealed refrigeration compressor has high measurement accuracy, good environmental immunity, and simplified measurement equipment.
Description
technical field [0001] The invention relates to the technical field of measurement of the rotational speed of a fully enclosed refrigeration compressor, in particular to the fields of algorithm application, current measurement, motor measurement, refrigeration system, data acquisition, and digital signal processing, and in particular to the measurement of the rotational speed of a fully enclosed refrigeration compressor method Background technique [0002] In the refrigeration system, the compressor is the core component of the system, and the measurement of its rotational speed is of great significance to the entire system. It has a very obvious impact on important indicators such as the cooling capacity, efficiency ratio, and temperature control of the system. For most of the refrigeration compressors, their structures are fully enclosed, so traditional direct measurement methods (such as encoders) are destructive to the compressor itself and are no longer applicable. The...
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IPC IPC(8): G01P3/48
CPCG01P3/48
Inventor 顾江萍金华强孙哲沈希黄跃进徐鸣
Owner ZHEJIANG UNIV OF TECH