CN219918747U

CN219918747U - Control circuit and servo driving system

Info

Publication number: CN219918747U
Application number: CN202320371098.6U
Authority: CN
Inventors: 谢子阳; 刘洋; 王晓伟; 冯继峰
Original assignee: Suzhou Inovance Technology Co Ltd
Current assignee: Suzhou Inovance Technology Co Ltd
Priority date: 2023-03-02
Filing date: 2023-03-02
Publication date: 2023-10-27
Anticipated expiration: 2033-03-02

Abstract

The utility model discloses a control circuit and a servo driving system, and belongs to the technical field of servo driving. The control circuit is connected with the first relay and comprises an opto-coupler isolator and a triode; the first end of the optocoupler isolator is connected with working voltage, the third end of the optocoupler isolator is connected with the base electrode of the triode, the fourth end of the optocoupler isolator is connected with one end of the first relay coil, the collector electrode of the triode is connected with the other end of the first relay coil, and the emitter electrode of the triode is grounded; the optocoupler isolator controls the triode to be switched on or off according to the received common control signal so as to drive the first relay to be switched on or off, and start and stop of soft start operation and start and stop of dynamic braking operation are realized. The utility model solves the problems of complex circuit and large occupied space in the prior art, and achieves the effects of simple structure, small occupied space and circuit module cost saving.

Description

Control circuit and servo driving system

Technical Field

The present utility model relates to the field of servo driving technologies, and in particular, to a control circuit and a servo driving system.

Background

In a servo driving system for controlling a motor, a soft start circuit is generally added in order to avoid damage to the system caused by surge current at the moment of starting; under the conditions of faults, scram and power outage, a dynamic braking circuit is generally added in order to enable a motor to stop rapidly, shorten the feeding distance and avoid loss caused by collision of parts. At present, for the two independent functions of soft start and dynamic brake, the two independent circuit modules are usually used for realizing the mode, and the mode has complex circuit redundancy, occupies large board space and increases the system cost.

Disclosure of Invention

The main purpose of the utility model is that: the control circuit and the servo driving system are provided, and the technical problem that the servo driving system with two functions of soft start and dynamic brake in the prior art is complex in circuit and large in occupied space is solved.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, the present utility model proposes a control circuit connected to a first relay K1, the control circuit including an optocoupler isolator U1 and a triode Q1;

the first end of the optocoupler isolator U1 is connected with the working voltage, the third end of the optocoupler isolator U1 is connected with the base electrode of the triode Q1, the fourth end of the optocoupler isolator U1 is connected with one end of the coil of the first relay K1, the collector electrode of the triode Q1 is connected with the other end of the coil of the first relay K1, and the emitter electrode of the triode Q1 is grounded;

the optocoupler isolator U1 controls the triode Q1 to be switched on or off according to the received common control signal so as to drive the first relay K1 to be switched on or off, and start and stop of soft start operation and start and stop of dynamic braking operation are realized.

Optionally, in the control circuit, the first relay K1 is a dual-contact relay;

One end of a first contact in the first relay K1 is electrically connected with the rectifying module, and the other end of the first contact in the first relay K1 is electrically connected with the bus capacitor C1 and used for controlling start and stop of soft start operation; the rectification module is used for converting three-wire input electricity into two-phase electricity and carrying out soft start charging on the bus capacitor C1;

one end of a second contact in the first relay K1 is electrically connected with a first phase winding of the motor, the other end of the second contact in the first relay K1 is electrically connected with a second phase winding of the motor, and the second contact is used for controlling starting and stopping of two-phase dynamic braking operation, and the motor is a two-phase motor or a three-phase motor.

Optionally, in the control circuit, the control circuit is further connected to a second relay K2;

the fourth end of the optocoupler isolator U1 is also electrically connected with one end of the coil of the second relay K2, and the collector electrode of the triode Q1 is also electrically connected with the other end of the coil of the second relay K2;

the triode Q1 is used for driving the on-off of the first relay K1, realizing the start and stop of dynamic braking operation, and driving the on-off of the second relay K2, realizing the start and stop of soft starting operation.

Optionally, in the control circuit, the first relay K1 is a dual-contact relay;

One end of a first contact in the first relay K1 is electrically connected with a first phase winding of the motor, the other end of the first contact in the first relay K1 is electrically connected with a second phase winding of the motor, one end of a second contact in the first relay K1 is electrically connected with the second phase winding of the motor, the other end of the second contact in the first relay K1 is electrically connected with a third phase winding of the motor, and the motor is used for controlling starting and stopping of three-phase dynamic braking operation.

Optionally, in the control circuit, the second relay K2 is a single-contact relay;

one end of the second relay K2 contact is electrically connected with the rectifying module, and the other end of the second relay K2 contact is electrically connected with the bus capacitor C1 and used for controlling start and stop of soft start operation.

Optionally, in the above control circuit, the control circuit further includes a resistor R3;

the second end of the optical coupler isolator U1 is connected with a main control module through a resistor R3, and the main control module is used for generating a common control signal and outputting the common control signal.

Optionally, in the above control circuit, the control circuit further includes a resistor R1 and a resistor R2;

one end of a resistor R1 is connected with a power supply voltage, the other end of the resistor R1 is respectively and electrically connected with one end of a resistor R2 and one end of a coil of the first relay K1, and the other end of the resistor R2 is electrically connected with a fourth end of the optocoupler isolator U1.

Optionally, in the above control circuit, the control circuit further includes a resistor R4;

one end of the resistor R4 is electrically connected with the rectifying module, and the other end of the resistor R4 is electrically connected with the bus capacitor C1.

In a second aspect, the present utility model also proposes a servo drive system comprising:

a first relay K1;

the control circuit module is connected with the first relay K1 and is used for driving the first relay K1 to be connected or disconnected according to the received common control signal, so that starting and stopping of soft start operation and starting and stopping of dynamic braking operation are realized; wherein the control circuit module comprises the control circuit.

Optionally, in the servo driving system, the servo driving system further includes:

a second relay K2;

the control circuit module is also connected with the second relay K2 and is used for driving the on-off of the first relay K1 according to the received common control signal to realize the start and stop of dynamic braking operation and driving the on-off of the second relay K2 to realize the start and stop of soft starting operation.

The one or more technical schemes provided by the utility model can have the following advantages or at least realize the following technical effects:

the control circuit and the servo driving system provided by the utility model are connected with the first relay K1 by adopting the control circuit comprising the optocoupler isolator U1 and the triode Q1, and the optocoupler isolator U1 controls the triode Q1 to be turned on or off according to the received common control signal so as to drive the first relay K1 to be turned on or off, thereby realizing the start and stop of soft start operation and the start and stop of dynamic braking operation; the control circuit of the utility model combines the existing soft start control circuit and dynamic brake control circuit in an optimized way, has simple structure and small occupied space, and can save the cost of circuit modules; the control circuit can also be applied to various servo driving systems, and is adaptive to different types and working conditions, so that the cost and the control function are optimized.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic circuit diagram of a control circuit of the present utility model;

FIG. 2 is a schematic diagram illustrating the connection of a servo drive system according to the present utility model;

FIG. 3 is another schematic circuit diagram of the control circuit of the present utility model;

FIG. 4 is a schematic diagram of another connection of the servo drive system of the present utility model.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, in the present utility model, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a device or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such device or system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude that an additional identical element is present in a device or system comprising the element. In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be either a fixed connection or a removable connection or integrated; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; the communication between the two elements can be realized, or the interaction relationship between the two elements can be realized. In the present utility model, if there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the present utility model, suffixes such as "module", "part" or "unit" used for representing elements are used only for facilitating the description of the present utility model, and have no specific meaning per se. Thus, "module," "component," or "unit" may be used in combination. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

In view of the technical problem that a servo driving system with two functions of soft start and dynamic brake in the prior art has complex circuit and large occupied space, the utility model provides a control circuit and a servo driving system, and specific embodiments and implementation modes are as follows:

example 1

Referring to fig. 1, fig. 1 is a schematic circuit diagram of a control circuit according to the present utility model; the present embodiment proposes a control circuit. The circuit can be applied to any servo driving system with two functions of soft start and dynamic brake, wherein the soft start function and the dynamic brake function can realize start and stop control by means of one relay, namely a first relay K1. At this time, the control circuit is connected to the first relay K1, and the circuit may include:

an optocoupler isolator U1 and a triode Q1;

the first end of the optocoupler isolator U1 is connected with working voltage, the third end of the optocoupler isolator U1 is connected with the base electrode of the triode Q1, the fourth end of the optocoupler isolator U1 is connected with one end of a first relay K1 coil, the collector electrode of the triode Q1 is connected with the other end of the first relay K1 coil, and the emitting electrode of the triode Q1 is grounded;

The optocoupler isolator U1 controls the triode Q1 to be switched on or off according to the received common control signal so as to drive the first relay K1 to be switched on or off, and start and stop of soft start operation and/or start and stop of dynamic braking operation are realized.

In this embodiment, soft start and dynamic braking may be implemented by two relays or by one relay, but the control circuits for soft start and dynamic braking may be multiplexed, and the control circuits may be used to drive a plurality of contacts in one relay to be turned on or off, respectively, or to drive two relays to be turned on or off, respectively, so that control of two functions of soft start and dynamic braking may be implemented. In practical applications, if only one function is needed, for example, only a soft start function is needed, the control circuit is also suitable, and correspondingly, if only a dynamic control function is needed, the control circuit is also suitable, specifically, a connection relationship of redundant contacts in one relay or a connection relationship of redundant relays in two relays can be correspondingly set according to actual needs, which is not limited in this embodiment of the present specification. .

In one embodiment, the working voltage may be provided by an independent power supply device or a power supply processing module that converts the voltage provided by the power supply device, for example, in this embodiment, the power supply processing module in the servo driving system may provide the working voltage of +5v to the optocoupler isolator U1. The working voltage is input to a first end of the optocoupler isolator U1, and specifically is input to an anode of a light emitting diode in the optocoupler isolator U1.

In this embodiment, the second end of the optocoupler isolator U1 may be the cathode of the light emitting diode in the optocoupler isolator U1, and may receive the common Control signal provided by the external circuit or the external module, for example, in this embodiment, the master Control module in the servo driving system may generate the common Control signal Control according to the built-in logic Control program, and output the common Control signal Control to the second end of the optocoupler isolator U1. The optocoupler isolator U1 comprises a light emitting diode and a phototriode, wherein the light emitting diode converts an input electric signal into an optical signal and transmits the optical signal to the phototriode, and the phototriode converts the optical signal into an electric signal for output. The third end of the optocoupler isolator U1 is an emitter of a phototriode, is connected with a base electrode of the triode Q1, and correspondingly controls the triode Q1 to be turned on or off based on a signal output by the third end of the optocoupler isolator U1. The fourth terminal of the optocoupler isolator U1 is a collector of a phototransistor, and is connected to one end of the coil of the first relay K1, such as the port 4 of K1 in fig. 1.

In this embodiment, the fourth end of the optocoupler isolator U1 may be further connected to a power supply voltage, where the power supply voltage may be provided by a power supply device or a power supply processing module that performs conversion processing on a voltage provided by the power supply device, for example, in this embodiment, the fourth end may be provided by a power supply device that provides a power supply voltage to the power supply processing module in the servo driving system, and may be specifically connected to the positive electrode +l of the power supply device. The collector of the transistor Q1 is connected to the other end of the coil of the first relay K1, as shown by port 5 of K1 in fig. 1. The emitter of the triode Q1 is grounded and may be connected to the negative electrode of the power supply device or the ground terminal of the power supply processing module, for example, in this embodiment, may be specifically connected to the negative electrode N of the power supply device in the servo driving system. It should be noted that, in specific applications, the configuration may be set according to actual needs, and the embodiments of the present disclosure are not limited to this.

The light emitting condition of the light emitting diode in the optocoupler isolator U1 is controlled through the received common Control signal Control, and the phototriode in the optocoupler isolator U1 is correspondingly driven to be turned on or off, so that the triode Q1 is correspondingly driven to be turned on or off according to the voltage condition of the base electrode of the triode Q1 output by the optocoupler isolator U1, whether the coil of the first relay K1 correspondingly generates electromagnetic force or not is controlled, and accordingly whether soft start operation and dynamic braking operation correspondingly act or not is controlled.

The control circuit of the embodiment is connected with the first relay K1 by adopting a control circuit comprising an optocoupler isolator U1 and a triode Q1, and the optocoupler isolator U1 controls the triode Q1 to be turned on or off according to a received common control signal so as to drive the first relay K1 to be turned on or off, thereby realizing the start and stop of soft start operation and/or the start and stop of dynamic brake operation; the control circuit of the utility model combines the existing soft start control circuit and dynamic brake control circuit in an optimized way, has simple structure and small occupied space, and can save the cost of circuit modules; the control circuit can also be applied to various servo driving systems, and is adaptive to different types and working conditions, so that the cost and the control function are optimized.

Example two

With reference to fig. 1 and 2, on the basis of the first embodiment, the present embodiment further proposes a control circuit that can be applied to any servo drive system having both soft start and dynamic braking functions as well.

The following description will be given by taking an example of application to a servo drive system as shown in fig. 2. As shown in the connection schematic of fig. 2, the servo drive system may include:

a first relay K1;

the rectification module is respectively connected with the three-phase input power and the first relay K1;

A bus capacitor C1;

the inversion and braking module is connected with the first relay K1 through a bus capacitor C1 and is also connected with the motor;

the main control module is connected with the inversion and braking module;

and the control circuit module is respectively connected with the main control module and the first relay K1 and comprises the control circuit of the embodiment.

The main control module is used for generating a common control signal and a driving control signal and outputting the common control signal and the driving control signal;

the rectification module rectifies three-phase input electricity into two-phase electricity, soft-start charging is carried out on the bus capacitor C1, and the inversion and braking module generates a motor driving signal according to a driving control signal sent by the main control module and the voltage provided by the bus capacitor C1 to drive a motor to work;

the control circuit module realizes logic control on the first relay K1 according to a common control signal sent by the main control module, specifically drives the first relay K1 to be switched on or off, and realizes start and stop of soft start operation and/or start and stop of dynamic braking operation.

Further, the first relay K1 is a double-contact relay;

One end of a second contact in the first relay K1 is electrically connected with a first phase winding of a motor, the other end of the second contact in the first relay K1 is electrically connected with a second phase winding of the motor and used for controlling start and stop of two-phase dynamic braking operation, and the motor is a two-phase motor or a three-phase motor.

As shown in the schematic circuit diagram of fig. 1, when the first relay K1 is a double-contact relay, a double-pole double-throw relay may be specifically selected.

One end of the first contact in the first relay K1 may be one end of a normally open contact, such as a port 2 of K1 in fig. 1, where the port 2 is connected to the negative output end N1 of the rectifying module, and a port 3 in K1 may be empty or connected to N1; the other end of the first contact in the first relay K1 may be the other end of the normally open contact, such as the port 1 of K1 in fig. 1, where the port 1 is connected to the negative input terminal N2 of the bus capacitor C1, and the positive input terminal of the bus capacitor C1 may be directly connected to the positive output terminal of the rectifying module. The first contact can play a role in controlling the voltage output by the rectifying module to start and stop the soft-start charging function of the bus capacitor C1.

One end of the second contact in the first relay K1 may be one end of a normally closed contact, such as a port 6 of K1 in fig. 1, the port 6 is electrically connected with a first phase winding of the motor, when the motor is a two-phase motor, the port 6 may be specifically connected with a positive pole of the motor, and when the motor is a three-phase motor, the port 6 may be specifically connected with any one phase of a three-wire winding of the motor, such as U in fig. 1; the other end of the second contact in the first relay K1 may be the other end of the normally closed contact, such as the port 7 of K1 in fig. 1, the port 7 is electrically connected with the second phase winding of the motor, when the motor is a two-phase motor, the port 7 may be specifically connected with the negative pole of the motor, when the motor is a three-phase motor, the port 7 may be specifically connected with the other phase of the three-wire winding of the motor, such as V in fig. 1, and the port 8 in K1 may be empty, or may be connected in parallel with the port 7, and connected with the second phase winding of the motor. The second contact can play a role in controlling the starting and stopping of the dynamic braking function of the motor winding, and can meet the two-phase dynamic braking and stopping requirements of the system on the motor, so that the motor can be stopped rapidly in a power failure state.

In this embodiment, the normally open contact of the first relay K1 is connected to soft start, and the normally closed contact is connected to dynamic brake, so that the soft start and dynamic brake in practical application can not be executed simultaneously. Based on this feature, when dynamic braking is required, triode Q1 is turned off, the coil of first relay K1 is not energized, the two contacts remain normal, port 6 and port 7 are turned on, port 1 is turned off from port 2, soft start is not active at this time, when soft start is required, triode Q1 is turned on, the coil of first relay K1 is energized, the contacts change, port 1 and port 2 are connected, port 6 and port 7 are turned off, and dynamic braking is not active at this time. In practical application, the on-off relation can be correspondingly set according to the needs so as to control the start and stop of different functions.

Optionally, one end of the second contact in the first relay K1 is electrically connected with the first phase winding of the motor through a dynamic braking resistor, and the other end of the second contact in the first relay K1 is also electrically connected with the second phase winding of the motor through a dynamic braking resistor.

As shown in fig. 2, the port 6 of the first relay K1 may be connected to the U of the motor through a dynamic braking resistor R5, and the ports 7 and 8 of the first relay K1 may be connected to the V of the motor through a dynamic braking resistor R6.

The relay and the motor are selectively connected with a dynamic braking resistor, so that the motor front module, namely the inversion and braking module, is protected from being damaged by regenerated electric energy of the motor, and the stable operation of a motor servo system is ensured.

Further, the control circuit may further include a resistor R3;

the second end of the optocoupler isolator U1 is connected with a main control module through the resistor R3, and the main control module is used for generating the common control signal and outputting the common control signal.

As shown in fig. 1, a resistor R3 is located between the second end of the optocoupler isolator U1 and the main Control module, and a common Control signal Control output by the main Control module is input to the second end of the optocoupler isolator U1 through the resistor R3, where the resistor R3 has the function of limiting current and preventing burning out the light emitting diode in the optocoupler isolator U1.

Further, the control circuit may further include a resistor R1 and a resistor R2;

one end of the resistor R1 is connected with a power supply voltage, the other end of the resistor R1 is electrically connected with one end of the resistor R2 and one end of the coil of the first relay K1 respectively, and the other end of the resistor R2 is electrically connected with the fourth end of the optocoupler isolator U1.

As shown in fig. 1, the power supply voltage may be provided by a power supply device or a power supply processing module that performs conversion processing on the voltage provided by the power supply device, for example, in this embodiment, may be provided by the power supply device, and may be specifically connected to the positive electrode +l of the power supply device. The power supply voltage is supplied to the output end of the opto-coupler isolator U1 and the coil of the first relay K1 after passing through the resistor R1, and the resistor R1 serves as a current limiting resistor to play a role of a protection circuit. The resistor R2 is arranged at the fourth end of the optocoupler isolator U1 and is connected with one end of the coil of the first relay K1, namely the port 4 of the coil K1, and the other end of the resistor R1, wherein the resistor R2 is a pull-up resistor, and has the function of limiting current flowing through the output end of the optocoupler isolator U1 when an external load is short-circuited and preventing the optocoupler isolator U1 from being damaged.

Further, the control circuit may further include a resistor R4;

As shown in fig. 1 and 2, one end of the resistor R4 is connected to the negative output terminal N1 of the rectifying module and the port 2 of the K1, which is one end of the normally open contact in the first relay K1, and the other end of the resistor R4 is connected to the negative input terminal N2 of the bus capacitor C1 and the port 1 of the K1, which is the other end of the normally open contact in the first relay K1. The resistor R4 is a piezoresistor and has the function of arc extinction. Under the power on condition, the contact of the first relay K1 is instantaneously disconnected, large arc voltage can be generated, impact of the arc voltage on other elements in a loop can be reduced after the resistor R4 is added, meanwhile, the contact is protected, and the relay is not easy to damage.

The control circuit of the embodiment combines the control circuit of the soft start function and the control circuit of the dynamic braking function into a specific control circuit, thereby realizing the effect of respectively controlling the soft start function and the dynamic braking function through a circuit module and a corresponding relay; the switching control of the first relay in the control circuit can be realized by combining with a relay logic control program built in the main control module in actual application, so that different actual application requirements are met; through the improvement to the circuit structure, the software logic control program meeting the actual demand is matched, and the demands of the soft start function and the dynamic braking shutdown function under different conditions can be met, so that the circuit can adapt to different models and different working conditions.

Example III

With reference to fig. 3 and 4, on the basis of the first embodiment, the present embodiment further proposes a control circuit that can be applied to any servo drive system having both soft start and dynamic braking functions as well.

The following description will be given by taking an example of application to a servo drive system as shown in fig. 4. As shown in the connection diagram of fig. 4, the servo drive system may include:

a first relay K1;

a second relay K2;

the rectification module is respectively connected with the three-phase input power and the second relay K2;

a bus capacitor C1;

the inversion and braking module is connected with the second relay K2 through a bus capacitor C1 and is also respectively connected with the first relay K1 and the motor;

the main control module is connected with the inversion and braking module;

and the control circuit module is respectively connected with the main control module, the first relay K1 and the second relay K2 and comprises the control circuit of the embodiment.

The control circuit module realizes logic control on the first relay K1 and the second relay K2 according to a common control signal sent by the main control module, specifically drives the first relay K1 to be switched on or switched off, realizes starting and stopping of dynamic braking operation, and drives the second relay K2 to be switched on or switched off, and realizes starting and stopping of soft starting operation.

Further, the first relay K1 is a double-contact relay;

As shown in the schematic circuit diagram of fig. 3, the motor may be a three-phase winding motor, and when the relay for controlling the motor to perform dynamic braking, that is, the first relay K1, is a double-contact relay, a double-pole double-throw relay may be specifically selected. One end of the first contact in the first relay K1 may be one end of a first normally closed contact, such as a port 2 of K1 in fig. 3, where the port 2 is electrically connected to the first phase winding of the motor, and may specifically be connected to any one phase of the three-phase winding of the motor, such as a W phase in fig. 3; the port 1 in the first relay K1 may be empty, or may be electrically connected to the port 2 and the first phase winding of the motor, such as the W phase in fig. 3, respectively; the other end of the first contact in the first relay K1 may be the other end of the first normally closed contact, such as a port 3 of K1 in fig. 3, where the port 3 is electrically connected to the second phase winding of the motor, and may specifically be connected to another phase of the three-phase winding of the motor, such as a V phase in fig. 3; one end of the second contact in the first relay K1 may be one end of a second normally closed contact, such as a port 6 of K1 in fig. 3, where the port 6 is electrically connected to the second phase winding of the motor, and may specifically be connected to another phase of the three-phase winding of the motor, such as a V phase in fig. 3; the other end of the second contact in the first relay K1 may be the other end of the second normally closed contact, such as a port 7 of K1 in fig. 3, where the port 7 is electrically connected to the third phase winding of the motor, and may specifically be electrically connected to the last phase of the three phase winding of the motor, such as a U phase in fig. 3; the port 8 in the first relay K1 may be empty, or may be electrically connected to the port 7 and the third phase winding of the motor, such as the U-phase in fig. 3, respectively; therefore, the connection between the dynamic braking relay, namely the first relay K1, and the three-phase winding motor is realized, and the first relay K1 is used as the dynamic braking relay to play a role in controlling the starting and stopping of the dynamic braking function of the three-phase winding of the motor, so that the three-phase dynamic braking stopping requirement of the system on the motor can be met, and the motor can be stopped rapidly in a power failure state.

Further, the second relay K2 is a single-contact relay;

As shown in fig. 3, when the second relay K2 is a single-contact relay, a single-pole single-throw relay may be specifically selected. One end of the second relay K2 contact may be one end of a normally open contact, such as a port 3 of K2 in fig. 3, where the port 3 is connected to the negative output end N1 of the rectifying module; the other end of the second relay K2 contact may be the other end of the normally open contact, such as the port 4 of K2 in fig. 3, the port 4 is connected with the negative input end N2 of the bus capacitor C1, and the positive input end of the bus capacitor C1 may be directly connected with the positive output end of the rectifying module; the second relay K2 is used as a soft start relay and can play a role in controlling the voltage output by the rectifying module to start and stop the soft start charging function of the bus capacitor C1.

In this embodiment, the first relay K1 is connected to dynamic braking, and the second relay K2 is connected to soft starting, so that a dynamic braking function and a soft starting function are correspondingly added in practical application according to needs. Based on the connection mode of fig. 3, when dynamic braking is required, the triode Q1 is disconnected, the coil of the first relay K1 and the coil of the second relay K2 are not electrified, the respective contacts remain normal, the port 1 and the port 2 of the first relay K1 are disconnected, the port 2 and the port 3 are connected, the port 6 and the port 7 are connected, the port 7 and the port 8 are disconnected, at the moment, dynamic braking can be applied, and the port 3 and the port 4 of the second relay K2 are disconnected, at the moment, soft starting is not applied; when soft start is needed, the triode Q1 is conducted, the port 3 and the port 4 of the second relay K2 are connected, and at the moment, the soft start can be used; the coils of the first relay K1 and the second relay K2 are electrified, the respective contacts are changed, the port 1 and the port 2 of the first relay K1 are connected, the port 2 and the port 3 are disconnected, the port 6 and the port 7 are disconnected, the port 7 and the port 8 are connected, and dynamic braking is not applied at the moment. In practical application, the on-off relation can be correspondingly set according to the needs so as to control the start and stop of different functions.

Optionally, one end of a first contact in the first relay K1 is electrically connected with the first phase winding of the motor through a first dynamic braking resistor, the other end of the first contact in the first relay K1 and one end of a second contact in the first relay K1 are respectively electrically connected with the second phase winding of the motor through a second dynamic braking resistor, and the other end of the second contact in the first relay K1 is also electrically connected with the third phase winding of the motor through a third dynamic braking resistor.

As shown in fig. 4, the port 1 and the port 2 of the first relay K1 may be connected to W of the motor through a dynamic braking resistor R7, the port 3 and the port 6 of the first relay K1 may be connected to V of the motor through a dynamic braking resistor R6, and the port 7 and the port 8 of the first relay K1 may be connected to U of the motor through a dynamic braking resistor R5.

The relay is selectively connected with the three-phase winding of the motor to form a dynamic braking resistor, so that the motor front module, namely the inversion and braking module, is protected from being damaged by regenerated electric energy of the motor, and the stable operation of the motor servo system is ensured.

Further, the control circuit may further include a resistor R3;

the second end of the optical coupler isolator U1 is connected with the main control module through a resistor R3.

one end of a resistor R1 is connected with a power supply voltage, the other end of the resistor R1 is respectively and electrically connected with one end of a resistor R2, one end of a first relay K1 coil and one end of a second relay K2 coil, and the other end of the resistor R2 is electrically connected with a fourth end of an optocoupler isolator U1.

As shown in fig. 3, one end of the resistor R1 may be connected to the positive electrode +l of the power supply device, and the power supply voltage is supplied to the output end of the optocoupler isolator U1, the coil of the first relay K1, and the coil of the second relay K2 after passing through the resistor R1, where the resistor R1 serves as a current limiting resistor to function as a protection circuit. The resistor R2 is arranged at the fourth end of the optocoupler isolator U1 and is connected with the other end of the resistor R1, one end of the coil of the first relay K1, namely the port 4 of the coil of the first relay K1, and one end of the coil of the second relay K2, namely the port 2 of the coil of the second relay K2, wherein the resistor R2 is a pull-up resistor, and has the function of limiting current flowing through the output end of the optocoupler isolator U1 when an external load is in short circuit and preventing the optocoupler isolator U1 from being damaged.

Further, the control circuit may further include a resistor R4;

As shown in fig. 3 and 4, one end of the resistor R4 is connected to the negative output terminal N1 of the rectifying module and the port 3 of K2, which is one end of the contact of the second relay K2, and the other end of the resistor R4 is connected to the negative input terminal N2 of the bus capacitor C1 and the port 4 of K2, which is the other end of the contact of the second relay K2. The resistor R4 is a piezoresistor and has the function of arc extinction.

The control circuit of the embodiment combines the control circuit of the soft start function and the control circuit of the dynamic brake function into a specific control circuit, which is different from the control circuit of the second embodiment, and can control two relays, thereby realizing the effect of respectively controlling the soft start relay and the dynamic brake relay through one circuit module; the control method has the advantages that the relay logic control program built in the main control module in actual application is combined, the opening and closing control of the two relays can be realized, the separate control of the soft start function and the dynamic braking function is realized, and therefore different actual application requirements are met.

Example IV

Referring to fig. 2, fig. 2 is a schematic connection diagram of a servo driving system according to the present utility model; the present embodiment proposes a servo drive system, which may include:

A first relay K1;

the control circuit module is connected with the first relay K1 and is used for driving the first relay K1 to be connected or disconnected according to the received common control signal so as to realize start and stop of soft start operation and/or start and stop of dynamic braking operation; the control circuit module includes a control circuit as described in the first embodiment or the second embodiment.

Further, as shown in fig. 2, the servo drive system may further include:

the main control module is used for generating a common control signal and outputting the common control signal;

the rectification module is respectively connected with the three-wire input electricity and the first relay K1;

the inversion and braking module is connected with the first relay K1 through a bus capacitor C1 and is also respectively connected with the main control module and the motor;

the rectification module rectifies three-phase input electricity into two-phase electricity to carry out soft start charging on the bus capacitor C1, and the inversion and braking module generates a motor driving signal according to a driving control signal sent by the main control module and voltage provided by the bus capacitor C1 to drive the motor to work.

Specifically, the rectification module may be a three-phase uncontrollable rectification bridge, converts the three-wire input electricity R, S, T into two-phase electricity, a resistor R4 is arranged on a zero line of the two-phase electricity, the resistor R4 is connected in parallel with two ends of a port 2 and a port 1 of the first contact in the first relay K1, the two-phase electricity is respectively connected with two ends of a bus capacitor C1, and the bus capacitor C1 may be a bus aluminum electrolytic capacitor for storing soft start electric energy to realize soft start of the servo driving system. The two ends of the bus capacitor C1 are respectively connected with the positive input end and the negative input end of the inversion and braking module, the inversion and braking module can perform transformation processing and inversion conversion processing on the voltage provided by the bus capacitor C1, namely the discharge voltage thereof, according to the driving control signals generated by the main control module, the driving control signals can be correspondingly generated by the main control module according to the logic control program built in practical application, the inversion and braking module is not limited herein, and finally, the inversion and braking module can output a three-phase motor driving signal to the motor and respectively send the motor driving signal to the U-phase winding, the V-phase winding and the W-phase winding of the motor, so that the motor is driven to work. And the output end of the inversion and braking module is connected with the U-phase winding and the V-phase winding of the motor in parallel to the port 6 and the port 7 of the second contact in the first relay K1. The first relay K1 is correspondingly controlled by a signal output by the main control module, and the opening and closing of two different contacts of the first relay K1 can be correspondingly controlled according to actual requirements, which is not limited herein.

The specific structure of the control circuit in the control circuit module may refer to the first embodiment or the second embodiment, and since the present embodiment adopts all the technical solutions of the first embodiment and the second embodiment, at least the technical solutions of the first embodiment have all the beneficial effects brought by the technical solutions of the first embodiment, and will not be described in detail herein.

Example five

Referring to FIG. 4, FIG. 4 is a schematic diagram illustrating another connection of the servo drive system of the present utility model; the present embodiment proposes a servo drive system, which may include:

a first relay K1;

a second relay K2;

the control circuit module is respectively connected with the first relay K1 and the second relay K2 and is used for driving the on-off of the first relay K1 according to the received common control signal, so as to realize the start and stop of dynamic braking operation and the on-off of the second relay K2 and realize the start and stop of soft starting operation.

Further, as shown in fig. 4, the servo driving system may further include:

the rectification module is respectively connected with the three-wire input electricity and the second relay K2;

The inversion and braking module is connected with the second relay K2 through the bus capacitor C1 and is also respectively connected with the main control module, the first relay K1 and the motor;

Specifically, the rectification module may be a three-phase uncontrollable rectification bridge, converts the three-wire input electricity R, S, T into two-phase electricity, a resistor R4 is arranged on a zero line of the two-phase electricity, the resistor R4 is connected in parallel with two ends of a contact of the second relay K2, namely, two ends of the port 3 and two ends of the port 4, the two-phase electricity is respectively connected with two ends of a bus capacitor C1, and the bus capacitor C1 may be a bus aluminum electrolytic capacitor for storing soft start electric energy to realize soft start of the servo driving system. The two ends of the bus capacitor C1 are respectively connected with the positive input end and the negative input end of the inversion and braking module, the inversion and braking module can perform transformation processing and inversion conversion processing on the voltage provided by the bus capacitor C1, namely the discharge voltage thereof, according to the driving control signals generated by the main control module, the driving control signals can be correspondingly generated by the main control module according to the logic control program built in practical application, the inversion and braking module is not limited herein, and finally, the inversion and braking module can output a three-phase motor driving signal to the motor and respectively send the motor driving signal to the U-phase winding, the V-phase winding and the W-phase winding of the motor, so that the motor is driven to work. And a first relay K1 is connected in parallel between the output end of the inversion and braking module and the U-phase winding, the V-phase winding and the W-phase winding of the motor. The first relay K1 and the second relay K2 are correspondingly controlled by signals output by the main control module, and the opening and closing of the first relay K1 and the second relay K2 can be correspondingly controlled according to actual requirements, which is not limited herein.

The specific structure of the control circuit in the control circuit module may refer to the first embodiment or the third embodiment, and since the present embodiment adopts all the technical solutions of the first embodiment and the third embodiment, at least the technical solutions of the first embodiment have all the beneficial effects brought by the technical solutions of the first embodiment, and will not be described in detail herein.

It should be noted that, the foregoing reference numerals of the embodiments of the present utility model are merely for describing the embodiments, and do not represent the advantages and disadvantages of the embodiments. The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings under the concept of the present utility model, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.

Claims

1. The control circuit is characterized by being connected with a first relay K1 and comprises an opto-coupler isolator U1 and a triode Q1;

the first end of the optocoupler isolator U1 is connected with working voltage, the third end of the optocoupler isolator U1 is connected with the base electrode of the triode Q1, the fourth end of the optocoupler isolator U1 is connected with one end of the first relay K1 coil, the collector electrode of the triode Q1 is connected with the other end of the first relay K1 coil, and the emitter electrode of the triode Q1 is grounded;

2. The control circuit of claim 1, wherein the first relay K1 is a dual contact relay;

one end of a second contact in the first relay K1 is electrically connected with a first phase winding of the motor, the other end of the second contact in the first relay K1 is electrically connected with a second phase winding of the motor and used for controlling start and stop of two-phase dynamic braking operation, and the motor is a two-phase motor or a three-phase motor.

3. The control circuit of claim 1, wherein the control circuit is further connected to a second relay K2;

The fourth end of the optocoupler isolator U1 is also electrically connected with one end of the second relay K2 coil, and the collector electrode of the triode Q1 is also electrically connected with the other end of the second relay K2 coil;

the triode Q1 is used for driving the on-off of the first relay K1, realizing the start and stop of dynamic braking operation, and driving the on-off of the second relay K2, and realizing the start and stop of soft starting operation.

4. A control circuit according to claim 3, wherein the first relay K1 is a dual contact relay;

5. The control circuit of claim 4, wherein the second relay K2 is a single contact relay;

6. A control circuit as claimed in claim 1 or 3, wherein the control circuit further comprises a resistor R3;

7. A control circuit according to claim 1 or 3, wherein the control circuit further comprises a resistor R1 and a resistor R2;

8. The control circuit of claim 2 or 5, wherein the control circuit further comprises a resistor R4;

9. A servo drive system, comprising:

a first relay K1;

the control circuit module is connected with the first relay K1 and is used for driving the first relay K1 to be connected or disconnected according to the received common control signal so as to realize start and stop of soft start operation and start and stop of dynamic braking operation; wherein the control circuit module comprises a control circuit as claimed in any one of claims 1 to 8.

10. The servo drive system of claim 9 further comprising:

a second relay K2;

the control circuit module is also connected with the second relay K2 and is used for driving the on-off of the first relay K1 according to the received common control signal, so as to realize the start and stop of dynamic braking operation and the on-off of the second relay K2 and realize the start and stop of soft starting operation.