CN112104296A

CN112104296A - Electrode stator multifunctional controller and setting method thereof

Info

Publication number: CN112104296A
Application number: CN202010841172.7A
Authority: CN
Inventors: 许益民; 张小君
Original assignee: Zhejiang Juno Electric Equipment Co ltd
Current assignee: Zhejiang Juno Electric Equipment Co ltd
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2020-12-18

Abstract

The invention discloses a multifunctional controller of an electrode stator and a setting method thereof, wherein the controller comprises five groups of bidirectional thyristors, five groups of photothyristors, a current-limiting resistor connected with each group of photothyristors, a relay, a group of interlocking drive circuits and a time delay control circuit, an input terminal and an output terminal, wherein the first photothyristor is connected with the single-phase bidirectional thyristor, the second photothyristor and the third photothyristor are connected with two groups of bidirectional thyristors which are positively rotated by a motor, the fourth photothyristor and the fifth photothyristor drive the two groups of bidirectional thyristors which are reversely rotated by the motor, the interlocking drive circuits drive the relays respectively driving the positive and negative rotation loops to close the driving loop with at most one direction conversion, the time delay control circuit is used for respectively controlling the interlocking drive circuit and the photothyristors to drive the corresponding thyristors according to the current state and receiving a switching instruction, the input terminal and the output terminal are connected to the bidirectional thyristor, respectively.

Description

Electrode stator multifunctional controller and setting method thereof

Technical Field

The invention belongs to the technical field of motor control, and particularly relates to an electrode stator multifunctional controller and a setting method thereof.

Background

The contactor is an electric appliance which controls the closing or opening of a main loop by using commercial power, industrial electricity or low-voltage electricity so as to control a large load. Due to the requirements of a control system, the contactor generally has a state output, and the state output reflects the control state of the contactor so as to be convenient for controlling safety. The method is mainly applied to the fields of industry, electric power and the like, and is used for controlling large-scale electric equipment such as large-scale motors, traveling cranes, reaction kettles and the like. Because the control loop is electrified to generate magnetic force to attract the contact in the electromagnetic relay ring so as to close the main loop, the mechanical action structure and the electrical opening and closing structure of the contact have relatively low reliability, and the contactor is easy to break down in application occasions needing frequent opening and closing, such as travelling cranes, cranes and the like, and the whole service life is short.

At present, the novel contactor for realizing the on-off control of a main circuit by utilizing a bidirectional thyristor does not have a mechanical action mechanism and an electrical on-off contact because the thyristor is adopted, but is triggered by a gate pole to conduct current, and the current is automatically closed when passing zero, so that the on-off times of the novel contactor are far higher than those of the traditional electromagnetic contactor. However, the thyristor is conducted by applying trigger pulse voltage to the gate, and the trigger voltage needs to be turned off after the main loop forms self-dimensional current, so that the service life of the thyristor is prolonged. After the main loop alternating voltage current crosses zero, the thyristor can not be self-maintained to be conducted, and the gate pole of the bidirectional thyristor is required to load pulse trigger voltage again to conduct reverse current. At present, the thyristor triggering mode mainly comprises a direct current triggering mode and an alternating current triggering mode. The structure phase reliability of the direct current trigger circuit is good, but the structure is complex, the cost is high, the alternating current trigger circuit is simple, the cost is low, and the false triggering is easy to generate.

Large ac motors used in industry are generally three-phase ac motors, and are generally controlled to be turned on and off by thyristors which are respectively triggered on three-phase lines. On the motor needing frequent forward and backward rotation switching, two groups of bidirectional thyristors for backward operation are connected in parallel on two-phase input and two-phase output of the motor, and when the thyristor on the original independent phase line and the two groups of thyristors are conducted, the motor can run backward. The controller for positive and negative rotation of the motor formed by the five groups of thyristors has a simpler structure and is easier to control. As long as the thyristor for positive phase sequence output is triggered, the motor rotates forwards, the thyristor for reverse operation sequence output is triggered and conducted, and two phases in the output phase sequence are exchanged, so that the motor rotates reversely. However, the structure requires that the thyristor group for positive phase sequence output and the thyristor group for negative phase sequence output cannot have thyristors which are conducted simultaneously at any moment, otherwise, two phases in three phases of a power supply are directly short-circuited, and corresponding thyristor is directly burned. The three-phase motor has larger power, when two phases of the thyristor are conducted, the other phase of the thyristor can be instantaneously loaded with a high-voltage pulse, and the high-voltage pulse is easy to cause the false triggering of the alternating-current trigger thyristor, so that the forward and reverse controllers of the thyristor motor with high reliability in the industry at present basically adopt a direct-current triggering direction, but basically do not adopt an alternating-current triggering mode.

Disclosure of Invention

In view of the above technical problems, the present invention is to provide a multifunctional controller for an electrode stator and a method for setting the same, and provide an improved ac trigger circuit structure and a control method, so as to suppress the problem of false triggering and realize highly reliable triggering on the premise of meeting the requirement of low cost.

In order to solve the technical problems, the invention adopts the following technical scheme:

one aspect of the embodiments of the present invention provides a multifunctional controller for an electrode stator, comprising five groups of bidirectional thyristors, five groups of photothyristors, a current limiting resistor connected to each group of photothyristors, a relay, a group of interlock driving circuits and a delay control circuit, an input terminal U, V, W and output terminals Uo, Vo and Wo, a first photothyristor connected to a single phase, a second photothyristor and a third photothyristor connected to two groups of bidirectional thyristors which are in forward rotation of a motor, a fourth photothyristor and a fifth photothyristor driving the motor to rotate in reverse directions, the interlock driving circuits driving the relays respectively driving the forward and reverse loops to close the driving loops having at most one direction conversion, the delay control circuit controlling the interlock driving circuits and the photothyristors to drive the corresponding thyristors respectively according to the current state and receiving a switching command, the input terminal and the output terminal are respectively connected with the bidirectional thyristor, and the three states of the motor are mutually converted: a stop state, a normal rotation state, and a reverse rotation state.

Preferably, when the motor is switched from stop to forward rotation or reverse rotation, the delay control circuit firstly controls the interlocking drive circuit to close the relay of the corresponding loop, and controls the first photothyristor and the corresponding photothyristor group after delay.

Preferably, when the motor is switched from rotation to stop, the time delay control circuit firstly turns off the photothyristor and then turns off the relay after delaying for more than 10 milliseconds.

Preferably, when the positive and negative phases of the motor are switched, the time delay control circuit firstly closes the photothyristors, delays the time for more than 20 milliseconds, then closes the originally opened relays and closes the relays of the other group of loops, and then controls the corresponding photothyristors to drive the thyristors after delaying.

Another aspect of the embodiments of the present invention provides a setting method of a multifunctional controller for an electrode stator, for setting the electrode stator multi-function controller as described above, the display setting module includes four buttons, S1 is a menu/exit button, S2 is a select button, S3 is an up button, S4 is a down button, setting parameters of the controller, setting an overcurrent value TO show CU, setting an overcurrent open-phase protection delay TO show PT, setting a temperature protection flag bit TO show TE, setting an overvoltage voltage TO show UO, setting an undervoltage voltage TO show UU, setting an open-phase protection flag bit TO show UA, setting an outdated alarm flag bit TO show UB, setting a cancel protection flag bit TO show UP, setting a forward and reverse phase inversion delay time TO TO, setting a one-way multi-controller delay start time TO set TQ, to the setting of overcurrent time delay start, overvoltage protection and undervoltage protection, the key operation process is as follows:

(1) pressing an S1 key to return to an initial interface, then pressing an S2 key to enter a menu, pressing an S3 key to select a CU, pressing an S2 key to enter and carry out bit value selection, pressing S3 or S4 to select a numerical value to an overcurrent value, simultaneously pressing S3 and S4 keys to confirm, wherein an SET character is generated to show that the setting is successful, then pressing an S1 key to exit, pressing an S2 key to select the CU, visually observing whether the data is the SET overcurrent value, if so, pressing S1 to return, and if not, resetting according to the previous steps;

(2) pressing an S1 key to return to an initial interface, then pressing an S2 key to enter a menu, pressing an S3 key to select PT, pressing an S2 key to enter the menu, then pressing S3 or S4 to select an over-current delay protection value, simultaneously pressing S3 and S4 keys to confirm, when an SET character appears to indicate that the setting is successful, pressing an S1 key to exit the menu, pressing an S2 key to select the PT, visually observing whether the data is the over-current delay protection value, if so, pressing S1 to return, and if not, pressing the previous step to reset;

(3) pressing an S1 key to return to an initial interface, pressing an S2 key to enter a menu, pressing an S3 key to select UO, pressing an S2 key to enter and carry out bit value selection, pressing an S3 or S4 numerical value to an overvoltage protection value, simultaneously pressing S3 and S4 keys to confirm, wherein an SET character shows that the setting is successful, pressing S1 to exit, pressing S2 to select UO, visually observing whether the data is the SET overvoltage protection value, and if the data is returned by pressing S1, if the data is not returned, pressing the previous step to reset;

(4) pressing an S1 key to return to an initial interface, then pressing an S2 key to enter a menu, pressing an S3 key to select a UU, pressing an S2 key to enter and carry out bit value selection, pressing S3 or S4 to select a numerical value to an undervoltage protection value, simultaneously pressing S3 and S4 keys to confirm, wherein an SET character shows that the setting is successful, pressing an S1 key to exit, pressing an S2 key to select the UU, visually observing whether the data is the SET undervoltage protection value, if yes, pressing S1 to return, and if not, pressing the previous step to reset.

The invention has the following beneficial effects: the novel contactless multipurpose control product for the motor is designed according to the actual needs of the electrical control industry and the crane industry, has the advantages of intelligence, no spark, strong anti-interference capability, long service life and the like, and is particularly suitable for an electrical control system with frequent action and severe working environment.

Drawings

FIG. 1 is a schematic structural diagram of a multi-function controller for an electrode stator according to an embodiment of the present invention;

fig. 2 is a flowchart of the motor stopping state converting to the rotating state in the electrode stator multifunctional controller according to the embodiment of the present invention;

fig. 3 is a flowchart of the motor rotation state switching to the stop state in the electrode stator multifunctional controller according to the embodiment of the present invention;

fig. 4 is a flowchart illustrating a forward rotation state of a motor in the electrode-stator multi-function controller according to an embodiment of the present invention is converted into a reverse rotation state.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, there is shown a multifunctional controller for an electrode stator according to an embodiment of the present invention, which includes five groups of bidirectional thyristors, five groups of photothyristors, a current limiting resistor connected to each group of photothyristors, a relay, a group of interlock driving circuits and a delay control circuit, an input terminal U, V, W and output terminals Uo, Vo, Wo, a first photothyristor connected to a single phase of the bidirectional thyristors, a second photothyristor and a third photothyristor connected to two groups of the bidirectional thyristors which are driven by a motor in a forward direction, a fourth photothyristor and a fifth photothyristor driving the motor in a reverse direction, the interlock driving circuits respectively driving the relays of the forward and reverse rotation circuits to close at most one direction-switching driving circuit, the delay control circuit for respectively controlling the interlock driving circuit and the photothyristors to drive the corresponding thyristors according to a current state and receiving a switching command, the input terminal and the output terminal are connected to the bidirectional thyristor, respectively. When the control voltage is input to the positive control input end, U is connected with Uo, V is connected with Vo, and W is connected with Wo; when the reverse control end inputs voltage, U is connected with Uo, V is connected with Wo, and W is connected with Vo.

In a specific application example, three states of the motor are mutually converted: the specific control method for the motor state conversion of the stop state, the forward rotation state and the reverse rotation state comprises the following steps:

when the motor is switched from a stop state to a rotation state, the delay control circuit firstly controls the interlocking drive circuit to close the relay of the corresponding loop, and controls the photothyristor 1 and the corresponding photothyristor group after delay; for example, when the motor is switched from a stop state to a forward rotation state, the delay control circuit sends a forward rotation signal to the interlocking circuit, the interlocking drive circuit judges the circuit and controls the relay according to the received signal, the interlocking drive circuit receives the forward rotation current signal and then controls the relay 2 and the relay 3 to be conducted, after the conduction is delayed for a certain time, the interlocking drive circuit feeds the state of the relay back to the delay circuit, the delay circuit sends a conduction instruction to the photothyristor 1, the photothyristor 2 and the photothyristor 3 according to the feedback information, after the photothyristor is conducted, a bidirectional thyristor channel for controlling the stop state and the forward rotation state is opened, when the current is transmitted to the motor through the thyristor, the motor controls the motor to rotate forward according to the received current signal, and the switching from the stop state.

When the motor is switched from a rotating state to a stopping state, the delay control circuit firstly closes the photothyristor and then closes the corresponding relay after delaying for more than 10 milliseconds according to the current state of the motor, for example, when the motor is switched from a reverse state to the stopping state, the delay control circuit sends a motor stopping instruction to the photothyristor 1, the photothyristor 4 and the photothyristor 5 to turn off the photothyristor 1, the photothyristor 4 and the photothyristor 5, after the time for the photothyristor to turn off for more than 10 milliseconds, the relay 1 is also in a turn-off state, the delay control circuit sends an instruction for turning off the relay to the interlocking drive circuit, the interlocking drive circuit turns off the relay 4 and the relay 5 according to the received instruction signal, a channel of the bidirectional thyristor group controlled by the interlocking drive circuit is also in;

when the motor is switched from the forward rotation state to the reverse rotation state, the time delay control circuit firstly enables the photothyristor to be turned off in a time delay mode for more than 20 milliseconds, then the relay 2 and the relay 3 which control the forward rotation of the motor receive the switching instruction and turn off the circuits at the relay 2 and the relay 3, and then the interlocking driving circuit sends a motor reverse rotation instruction to the relay 4 and the relay 5, so that the two relays are in a conduction state, two groups of bidirectional thyristors which are connected with the photothyristor 4 and the photothyristor 5 are in a conduction state at the moment, when current is input at an input end, the current passes through two groups of thyristor channels which are conducted, reverse rotation signals are transmitted to the motor from the output end.

In a specific application example, when the motor is switched to forward rotation or reverse rotation from stop, the delay control circuit firstly controls the interlocking drive circuit to close the relay of the corresponding loop, and controls the first photothyristor and the corresponding photothyristor group after delay. When the motor is switched from rotation to stop, the time delay control circuit firstly closes the photothyristor and then closes the relay after delaying the time for more than 10 milliseconds. When the positive and negative phases of the motor are switched, the time delay control circuit firstly closes the photothyristor, delays the time for more than 20 milliseconds, then closes the originally opened relay and closes the relay of the other group of loops, and then controls the corresponding photothyristor to drive the thyristor after delaying.

In order to accomplish the above functions, it is necessary to set an overcurrent value, a delay value, an overvoltage protection value and an undervoltage protection value. The embodiment of the invention provides a setting method for the multifunctional controller of the electrode stator, the display setting module comprises four keys, S1 is a menu/exit button, S2 is a bit selection button, S3 is an ascending button, S4 is a descending button, the parameter setting is carried out on the controller, the overcurrent value is set and displayed as CU, the overcurrent open-phase protection delay is displayed as PT, the temperature protection flag is displayed as TE, the overvoltage voltage setting value is displayed as UO, the undervoltage setting value is displayed as UU, the open-phase protection flag is displayed as UA, the outdated alarm flag is displayed as UB, the protection canceling flag is displayed as UP, the forward and reverse rotation delay time is set as TO, the one-way multi-controller delay starting time is set as TQ, the overcurrent setting for delay starting, overvoltage protection and undervoltage protection is carried out, and the key operation process is as follows:

In a specific application example, the overcurrent value can be set to 210A, the overcurrent delay value can be set to 5 seconds, the overvoltage protection value can be set to 420V, and the undervoltage protection value can be set to 350V.

After the setting is finished, if an abnormality occurs, the display code can be abnormally displayed by setting the state code, and if the overcurrent flag bit is E1, the current imbalance flag bit is E2, the voltage open-phase flag bit is E3, the voltage overvoltage flag bit is E5, the temperature overhigh flag bit is E4, the voltage undervoltage flag bit is E6, and the maintenance time is TOUT. By setting the abnormal zone bit, the reason of the abnormal state of the controller can be reflected in real time, and the abnormal state can be processed and repaired in time.

It is to be understood that the exemplary embodiments described herein are illustrative and not restrictive. Although one or more embodiments of the present invention have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.

Claims

1. A multifunctional controller for electrode stator is composed of five groups of bidirectional thyristors, five groups of photoelectric thyristors, current limiting resistor connected to each group of thyristors, relay, interlocking drive circuit, delay control circuit, input U, V, W and output UO, Vo and Wo terminals, the first thyristor connected to the bidirectional thyristor of single phase, the second and third thyristors connected to two groups of bidirectional thyristors rotating forward by motor, the fourth and fifth thyristors driving reverse rotation of motor, the interlocking drive circuit for driving the relay to close the driving loop with at most one direction change, and the delay control circuit for controlling the interlocking drive circuit and the photoelectric thyristors to drive the corresponding thyristors according to current state and received switching instruction, the input terminal and the output terminal are respectively connected with the bidirectional thyristor, and the three states of the motor are mutually converted: a stop state, a normal rotation state, and a reverse rotation state.

2. The electrode-stator multifunctional controller according to claim 1, wherein when the motor is switched from stop to forward rotation or reverse rotation, the delay control circuit first controls the interlock driving circuit to close the relay of the corresponding loop, and controls the first photo-controlled silicon and the corresponding photo-controlled silicon group after delay.

3. The electrode-stator multifunctional controller of claim 1, wherein when the motor is switched from rotation to stop, the time delay control circuit firstly turns off the photothyristor and then turns off the relay after delaying for more than 10 milliseconds.

4. The electrode stator multifunctional controller of claim 1, wherein when the motor is switched between positive and negative phases, the delay control circuit firstly closes the photothyristor for more than 20 milliseconds, then closes the relay which is opened originally and closes the relay of the other group of loops, and then controls the corresponding photothyristor to drive the thyristor after delay.

5. A setting method of an electrode stator multi-function controller, for setting the electrode stator multi-function controller as claimed in any one of claims 1 to 4, wherein the display setting module comprises four keys, S1 is a menu/exit button, S2 is a select button, S3 is an up button, S4 is a down button, setting parameters of the controller, setting an overcurrent value TO show CU, setting an overcurrent open-phase protection delay TO show PT, setting a temperature protection flag bit TO show TE, setting an overvoltage voltage TO show UO, setting an undervoltage voltage TO show UU, setting an open-phase protection flag bit TO show UA, setting an outdated alarm flag bit TO show UB, setting a cancel protection flag bit TO show UP, setting a forward and reverse phase inversion delay time TO TO, setting a one-way multi-controller delay start time TO set TQ, to the setting of overcurrent time delay start, overvoltage protection and undervoltage protection, the key operation process is as follows: