A step-down energy-saving device for an asynchronous motor and its energy-saving control method

Abstract

The invention discloses an asynchronous motor step-down energy saver and an energy saving control method thereof. The asynchronous motor step-down energy saver consists of a voltage regulating device, a detection circuit, a computation module, a controller, and a trigger circuit, wherein an input end of the voltage regulating device is connected with an external power grid, and an output end of the voltage regulating device is directly connected with a stator end of a motor; the detection circuit outputs signals to the computation module; the computation module computes the optimal voltage, and inputs the optimal voltage and an actual voltage of a stator into the controller; and the controller controls actions of the voltage regulating device by virtue of the trigger circuit so as to control the input voltage of the stator end of the motor. The asynchronous motor step-down energy saver has the following technical effects: 1, the asynchronous motor step-down energy saver has relatively good control quality, and good anti-disturbance capability, and can achieve high-speed high-precision control especially in a severe environment; and 2, the asynchronous motor step-down energy saver adopts an auto-disturbance rejection control technology, has the characteristics of small overshoot and short transitional process, can adapt to changes of an object model and a surrounding environment in a very large range, does not influence the control quality of the controller, and has very good robustness.

Description

technical field [0001] The present invention is an asynchronous motor step-down economizer and its energy-saving control method, in particular a new type of motor economizer that applies ADRC technology to a controller, which belongs to asynchronous motor economizers Buck economizer. Background technique [0002] With the continuous advancement of industrialization and urbanization, the deepening of economic and social development, my country's dependence on energy is becoming stronger and stronger. How to better improve the efficiency of energy development and utilization, further promote the improvement of related energy-saving technologies, and promote energy conservation The development of the industry has become a problem that the whole society should pay attention to and solve. Under the condition that the total amount of energy cannot be changed, energy saving has become an important way to solve the energy crisis in our country. [0003] As the most widely used moto...

AI Technical Summary

Problems solved by technology

In practice, industrial and mining enterprises have a considerable number of asynchronous motors and related drive systems in a non-economic operating state, resulting in a huge waste of electric energy

Analyzing the reasons, there are two main reasons: First, the direct start-up current of the asynchronous motor is too large, causing a large impact on the power grid, which affects the normal operation of other equipment in the same power grid; on the other hand, the asynchronous motor is running , the load changes frequently, which causes the motor to be in a light-load and no-load state, the power factor and efficiency become low, the phenomenon of "big horse-drawn cart" is serious, and electric energy is consumed in vain

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