Test method for energy-saving rate of asynchronous motor fluctuating load

Abstract

The invention discloses a method for testing the energy saving ratio of an asynchronous motor under a fluctuating load. In the method, the asynchronous motor is powered by a power supply and drives the fluctuating load, an integrated power monitoring instrument detects the voltage of the power supply and detects the operation current of the asynchronous motor through a current transformer, and an operation unit is connected with the integrated power monitoring instrument through a communication port and calculates the instantaneous power of operation of the asynchronous motor. Considering that the motor may not run in a rated state during detection, the instantaneous power is converted into the instantaneous input power for rated operation according to the operation current, a plurality of sets of data can be acquired at each detection, and the arithmetic mean of each set of data within the range of load rate from 0.7 to 0.8 is solved. The asynchronous motor is detected before and after replacement to obtain the energy saving ratio after asynchronous motor replacement, and the amount of power saved after motor replacement can be worked out according to the operation time of the motor. By adopting the method, the energy saving ratio of an asynchronous motor can be worked out accurately under a fluctuating load, so that the efficiency of motor transformation can be evaluated correctly, and the purpose of saving energy and reducing energy consumption can be achieved.

Description

technical field [0001] The invention relates to a test method for the energy-saving rate of fluctuating loads of asynchronous motors. Background technique [0002] As the power source of various equipment such as fans, pumps, compressors, and mills, electric motors are widely used in various fields such as industry, agriculture, and transportation. According to statistics, the power consumption of motors occupies a considerable proportion, and its power consumption accounts for about 66% of industrial power consumption. Therefore, improving the efficiency of motors and actively promoting the application of high-efficiency motors or energy-saving motors will play a positive role in promoting national economic construction, energy conservation and environmental protection. [0003] Replacing the ordinary efficiency motor with an ultra-high efficiency motor with low loss and high efficiency can reduce power consumption under the condition of constant load and achieve the purpo...

AI Technical Summary

Problems solved by technology

[0007] In fact, there is a gap between the actual efficiency of the motor and the theoretical efficiency, coupled with the fluctuation of the motor load, and often cannot work under the rated load state, so the actual energy saving of the motor may be different from the theoretical value

[0008] Due to changes in on-site process conditions, for fluctuating loads such as fans and pumps, the current changes greatly, and the fluctuation rate sometimes exceeds 5%. However, the efficiency of ultra-high-efficiency motors is about 3% higher than that of ordinary motors. Before and after the replacement of the motor, through The traditional method measures the electric power for a period of time to compare, the deviation is very large, and it cannot objectively reflect the actual energy-saving rate before and after the motor is replaced. Energy saving rate

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