CN106597934A - Intelligent control method for optimizing permanent magnet contactor - Google Patents

Abstract

The invention discloses an intelligent control method for optimizing a permanent magnetic contactor, comprising the following steps: when the permanent magnetic contactor is closed, the main circuit switch is closed, since the moving displacement of the permanent magnetic contactor moving iron core and the coil current have a mapping Therefore, the real-time displacement of the moving iron core can be obtained by processing the single-chip microcomputer after detecting the coil current, and the corresponding moving speed of the moving iron core can be obtained through the processing of the single-chip microcomputer; the real-time displacement and corresponding moving speed of the moving iron core can be set as the input of fuzzy control , and through the corresponding fuzzy control rules, the corresponding duty cycle output is obtained through the processing of the single-chip microcomputer. Considering that the output is a continuous function, the switch S1 of the main circuit cannot be directly controlled, so it is necessary to sample at a certain interval of the single-chip microcomputer system. In this way, the PWM output for controlling the switch S1 of the main circuit is obtained, thereby realizing the regulation of the coil current passing through the main circuit and improving the closing dynamic characteristics of the contactor.

Description

An Intelligent Control Method for Optimizing Permanent Magnetic Contactor

technical field

The invention relates to the fields of electrical equipment and electrical engineering, in particular to an intelligent control method for optimizing a permanent magnetic contactor.

Background technique

At present, there are two main categories for improving the dynamic characteristics of permanent magnetic contactors. One is to optimize the body parameters of permanent magnetic contactors based on various optimization algorithms. The disadvantage is that the dynamic characteristics of permanent magnetic contactors cannot be adjusted in real time when closing. characteristics; another method is by applying good control methods, such as the existing segmental PWM control technology, field weakening control, etc. Segmentation, and then apply corresponding control, which relies too much on subjective judgment, and belongs to open-loop control, and the system robustness is not strong.

Contents of the invention

The object of the present invention is to provide a kind of intelligent control method for optimizing permanent magnet contactor, by using the moving displacement of moving iron core and the corresponding speed as the input of fuzzy control, duty cycle is as the output of fuzzy control, this duty cycle As the duty cycle of the PWM control of the main circuit, the dynamic characteristics of the permanent magnetic contactor are improved by adjusting the output current of the main circuit, and the purpose of optimization is achieved.

The technical problem solved by the present invention can adopt following technical scheme to realize:

An intelligent control method for optimizing a permanent magnet contactor, comprising the steps of:

1) When the permanent magnetic contactor is closed, the main circuit switch is closed. Since the moving displacement of the permanent magnetic contactor's moving iron core has a mapping relationship with the coil current, the real-time displacement of the moving iron core can be obtained by detecting the coil current and processed by a single-chip microcomputer, and The corresponding moving iron core moving speed can be obtained through single-chip processing;

2) Set the real-time displacement of the moving iron core and the corresponding moving speed as the input of fuzzy control, and through the corresponding fuzzy control rules, through the processing of the single-chip microcomputer, the corresponding duty cycle output is obtained. Considering that the output is a continuous function, it cannot Directly control the switch S1 of the main circuit, so it is necessary to sample at a certain interval of the single-chip system to obtain the PWM output that controls the switch S1 of the main circuit, thereby realizing the regulation of the coil current passing through the main circuit and improving the closing dynamics of the contactor characteristic;

3) When it is judged that the moving iron core of the permanent magnet contactor has completed the closing process, turn off the main circuit switch S1;

4) The working voltage of the permanent magnetic contactor is 85% Un ~ 110% Un. When the permanent magnetic contactor is in the working state, a varistor is added to the incoming line of the main circuit. When it is in an overvoltage state, the varistor Connected, so that the subsequent main circuit is short-circuited, no electricity passes through, and the subsequent circuit has a power sampling and comparison link, which can detect the signal and send it to the single-chip microcomputer. The single-chip microcomputer alarms and disconnects the main circuit; When the voltage is low or low, it will be sent to the single-chip microcomputer through the sampling and comparison link in the follow-up circuit, and the single-chip microcomputer will alarm and cut off the main circuit;

5) When the permanent magnet contactor receives the opening signal, the single chip microcomputer sends out the opening signal, and controls the opening switch S2 to close, and the energy storage capacitor C is discharged, thereby weakening the magnetic field of the permanent magnetic contactor and realizing opening.

Compared with the prior art, the beneficial effects of the present invention are as follows:

1. The dynamic closing process of the permanent magnet contactor is very complicated, involving electric field, magnetic field, temperature field, mechanical dynamics, etc., and the modeling process of these complex couplings can be avoided through fuzzy control.

2. When the permanent magnet contactor is closed, it is often affected by the opening phase angle and the working voltage, but the control method proposed by the present invention has strong robustness and is basically not disturbed by these factors, which can effectively improve the permanent magnet contactor. The dynamic characteristics of the device reduce the number of bounces of the contacts.

Description of drawings

Fig. 1 is a main circuit diagram for optimizing a permanent magnetic contactor according to the present invention.

Fig. 2 is a block diagram of a control structure for optimizing a permanent magnetic contactor according to the present invention.

Fig. 3 is a structural block diagram of the fuzzy control for optimizing the permanent magnetic contactor according to the present invention.

detailed description

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

An intelligent control method for optimizing a permanent magnet contactor according to the present invention comprises the following steps:

I. When the permanent magnetic contactor is closed, the main circuit switch is closed. Since the moving displacement of the permanent magnetic contactor’s moving iron core has a certain relationship with the coil current, the real-time displacement of the moving iron core can be obtained by detecting the coil current and then processed by a single-chip microcomputer. And the corresponding moving speed of the moving iron core can be obtained through the processing of the single-chip microcomputer. See Figure 1 for the main circuit diagram.

II. Set the real-time displacement of the moving iron core and the corresponding moving speed as the input of fuzzy control, and through the corresponding fuzzy control rules, through the processing of the single-chip microcomputer, the corresponding duty ratio output is obtained. Considering that the output is a continuous function, it cannot Directly control the switch S1 of the main circuit, so it is necessary to sample at a certain interval of the single-chip system (the sampling time is the period T of the output PWM), so as to obtain the PWM output that controls the switch S1 of the main circuit, so as to realize the coil passing through the main circuit The regulating effect of the current improves the closing dynamic characteristics of the contactor. See Figure 2 for the control structure diagram and Figure 3 for the fuzzy control structure diagram.

III. After judging that the moving iron core of the permanent magnet contactor has completed the closing process, turn off the main circuit switch S1.

Ⅳ. Relevant regulations, the working voltage of the permanent magnet contactor is 85% Un ~ 110% Un. When the permanent magnetic contactor is in the working state, a varistor is added to the incoming line of the main circuit. There is an electrical sampling and comparison link in the circuit, which can detect the signal and send it to the single-chip microcomputer. The single-chip microcomputer generates an alarm and disconnects the main circuit; , the single chip microcomputer alarms and cuts off the main circuit.

Ⅴ. When the permanent magnet contactor receives the opening signal, the single chip microcomputer sends out the opening signal, and controls the opening switch S2 to close, and the energy storage capacitor C is discharged, thereby weakening the magnetic field of the permanent magnet contactor and realizing opening.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (1)

1. a kind of intelligent control method for optimizing permanent magnet contactor, it is characterised in that comprise the steps：

1) when permanent magnet contactor is closed, main circuit switch closure, because permanent magnet contactor moves moving displacement and coil unshakable in one's determination Electric current has mapping relations, therefore can process the real-time displacement for obtaining dynamic iron core by Jing single-chip microcomputers after detection coil electric current, And corresponding dynamic iron core translational speed can be obtained by single-chip microcomputer process；

2) dynamic real-time displacement unshakable in one's determination and corresponding translational speed are set as the input of fuzzy control, and by corresponding fuzzy Control rule, via single-chip microcomputer process, obtains corresponding dutycycle output, it is contemplated that this is output as continuous function, it is impossible to directly The switch S1 of control main circuit, it is therefore desirable to by the sampling of the certain intervals time of SCM system, so as to obtain control master The PWM outputs of contactor S1, so as to realize the adjustment effect of the coil current passed through to main circuit, improve the closure of contactor Dynamic characteristic；

3) after determining the dynamic iron core of permanent magnet contactor and completing closing course, main circuit switch S1 is disconnected；

4) operating voltage of permanent magnet contactor is in 85%Un～110%Un, when permanent magnet contactor is in running order, main circuit End of incoming cables adds a piezo-resistance, and when in overvoltage condition, the piezo-resistance is connected, and causes follow-up main circuit to be shorted, Pass through without electricity, and have electricity sampling comparing element in subsequent conditioning circuit, the signal can be detected, and be sent in single-chip microcomputer, single-chip microcomputer Report to the police, and disconnect main circuit；When in decompression or it is under-voltage when, sampled comparing element, is sent in list in subsequent conditioning circuit Piece machine, single-chip microcomputer is reported to the police, and cuts off main circuit；

5) when permanent magnet contactor receives sub-gate signal, single-chip microcomputer sends sub-gate signal, and controls its separating brake switch S2 closure, Storage capacitor C realizes electric discharge, so as to realize weakening the magnetic field of permanent magnet contactor, realizes separating brake.