Dual-mode intelligent motor power saver

Abstract

The invention relates to power-saving protection equipment, in particular to a dual-mode intelligent motor power saver. The power saver comprises an intelligent control unit, a voltage sampling unit,a frequency converter, and a contactor, wherein the voltage sampling unit, the frequency converter, and the contactor are connected to the intelligent control unit, and the contactor is also connectedto the frequency converter. The power saver further comprises an input filtering unit and an output filtering unit, and the intelligent control unit makes analysis and judgment based on received loadinformation and motor running information, and then sends instructions to the frequency converter and the contactor; a motor load is made to obtain corresponding voltage to achieve energy saving in load tracking; and / or input power is rapidly adjusted for load changes of the motor to achieve energy saving in frequency conversion. The power saver has the advantages of achieving energy saving in load tracking, energy saving in frequency conversion and energy saving in frequency conversion plus tracking, lowering motor loss, improving running efficiency of the motor; the input filtering unit andthe output filtering unit are adopted to conduct filtering on input voltage and output voltage, high-order and low-order harmonics are restrained, a power grid is cleansed, power factors are improved.

Description

technical field [0001] The invention relates to power saving protection equipment, in particular to a dual-mode intelligent motor power saver. Background technique [0002] For motors with adjustable speed such as fans and pumps, the method of frequency conversion speed regulation can achieve better results, but at present, there is a lack of corresponding technical solutions for a large part of motors that do not allow speed regulation, and the general phase-controlled power saver The technology platform is relatively backward, and the load requirements are harsh in practical applications, and the power saving effect is not ideal. [0003] Generally, when using a motor, the selected rated power usually exceeds the actual required power, and because the demand (load rate) in the production process changes, at this time, the motor itself cannot make corresponding power adjustments. [0004] In the current drive technology for motors, frequency conversion speed regulation pro...

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Problems solved by technology

[0002] For motors with adjustable speed such as fans and pumps, the method of frequency conversion speed regulation can achieve better results, but at present, there is a lack of corresponding technical solutions for a large part of motors that do not allow speed regulation, and the general phase-controlled power saver The technology platform is relatively backward, and the load requirements are strict in practical applications, and the power saving effect is not ideal

[0003] Generally, when using a motor, the selected rated power usually exceeds the actual required power, and because the demand (load rate) in the production process changes, at this time, the motor itself cannot make corresponding power adjustments.

[0004] In the current drive technology for motors, frequency conversion speed regulation products have been applied and popularized to a certain extent, but in actual production, more motors are not allowed to decelerate, and can only work at power frequency, such as punching machines and lathes , Crusher, conveyor belt, etc., and the load rate of the motor is not high at this time, the motor operating efficiency (output power / input power*100%) depends on the load rate (output power / rated power*100%), The lower the load rate, the lower the efficiency. Although the application of motors in enterprises is common, most motors often operate under no-load, light load, medium load and variable load conditions. In the actual production process, the motor load rate is low. ("big horse-drawn cart"), low work efficiency, less than 40% utilization rate of electric energy terminal, serious waste of electric energy

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