Efficient electricity-saving appliance of intelligent three-phase electric motor

Abstract

The invention discloses an efficient electricity-saving appliance of an intelligent three-phase electric motor and relates to the technical field of control devices of alternating-current electric motors. The efficient electricity-saving appliance comprises a power adjusting unit, a voltage sampling unit, a zero-detection unit, a sawtooth wave forming unit, a power adjusting signal synthesis unit, a square-wave oscillator, a phase demodulation unit, a first current sampling unit, a changeover switch, a second current sampling unit, a soft starting unit, an overload protection unit, a phase loss protection unit, a startup and shutdown soft parking unit and a starting and opening changeover unit. The efficient electricity-saving appliance can dynamically adjust power input into the electric motor with change of electric motor loading capacity, ensures that the electric motor operates at the optimum load rate, reduces reactive loss of the electric motor, remarkably improves the actual operating efficiency of the electric motor and achieves the electricity-saving purpose.

Description

technical field [0001] The invention relates to the technical field of control devices for AC motors, in particular to an intelligent high-efficiency power saver for three-phase motors. Background technique [0002] In industrial and agricultural production, motors are widely used, but their operating efficiency is generally low. This is because the voltage fluctuation of the power grid, equipment overload, mechanical wear and other factors must be considered when selecting motors for mechanical equipment. The power margin is usually in the About 30%. These devices rarely work at full load in the actual production process, and the phenomenon of "big horse-drawn carts" is very common, especially for variable loads such as industrial and mining motors, pumping units, crushers, injection molding machines, stone cutting machines, and lifting equipment. The mechanical load rate is lower, the operating efficiency is lower, and the waste of electric energy is amazing. Contents o...

AI Technical Summary

Problems solved by technology

These devices rarely work at full load in the actual production process, and the phenomenon of "big horse-drawn carts" is very common, especially for variable loads such as industrial and mining motors, pumping units, crushers, injection molding machines, stone cutting machines, and lifting equipment. The mechanical load rate is lower, the operating efficiency is lower, and the waste of electric energy is amazing

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