CN209748441U - Motor drive circuit and integrated control device - Google Patents

Abstract

the application relates to the field of integrated control and discloses a motor drive circuit and an integrated control device, the motor drive circuit comprises: an AC-to-DC circuit and an inverter circuit; the alternating current-to-direct current circuit comprises a rectifying circuit and a filtering circuit, wherein the input end of the rectifying circuit is used for being connected with an external power supply, and the output end of the rectifying circuit is connected with the input end of the filtering circuit; the inverter circuit comprises a plurality of IGBT groups, the input ends of the IGBT groups are respectively connected to different output ends of the filter circuit, and the output ends of the IGBT groups are respectively connected with a motor so as to send driving signals to the motor. The application also provides an integrated control device for controlling a set number of motors, which comprises the motor driving circuit and the control circuit. The motor drive circuit that this application provided changes direct current circuit and a plurality of IGBT group link through exchanging, realizes sending drive signal to a plurality of motors simultaneously, has simplified motor drive circuit structure, has practiced thrift the hardware cost.

Description

Motor drive circuit and integrated control device

Technical Field

The present disclosure relates to integrated control, and particularly to a motor driving circuit and an integrated control device.

background

In the existing motor control, one frequency converter is adopted to control one motor for controlling a plurality of motors, namely, an independent driving circuit is adopted to drive the motors. When a plurality of motors need to be controlled, a driving circuit which can realize integrated control is needed.

SUMMERY OF THE UTILITY MODEL

the technical problem that this application mainly solved provides a motor drive circuit and integrated control device, can realize utilizing a motor drive circuit to drive a plurality of motors, simplifies motor drive control's circuit structure.

In order to solve the technical problem, the application adopts a technical scheme that: provided is a motor drive circuit including: an AC-to-DC circuit and an inverter circuit;

The alternating current-to-direct current circuit comprises a rectifying circuit and a filter circuit, wherein the input end of the rectifying circuit is used for being connected with an external power supply, and the output end of the rectifying circuit is connected with the input end of the filter circuit;

the inverter circuit comprises a plurality of IGBT groups, the input ends of the IGBT groups are respectively connected to different output ends of the filter circuit, and the output ends of the IGBT groups are respectively connected with a motor so as to send driving signals to the motor.

In order to solve the above technical problem, another technical solution adopted by the present application is: providing an integrated control device, wherein the integrated control device is used for controlling a set number of motors;

the device comprises: motor drive circuit and control circuit

The control circuit includes: the first processing chip comprises the set number of pulse width modulation ports, and the set number of pulse width modulation ports are respectively connected with the motor driving circuit so as to respectively output pulse width modulation instructions to the motor driving circuit;

The motor driving circuit is the motor driving circuit as described above, and the motor driving circuit is configured to output driving signals corresponding to the pulse width modulation commands to the set number of motors respectively when receiving the pulse width modulation commands output by the set number of pulse width modulation ports.

In the scheme, the motors can be driven by adopting one motor driving circuit, the number of components required for controlling the motors is reduced, the circuit structure of motor driving control is simplified, and the cost is saved.

Drawings

FIG. 1 is a schematic diagram of a motor driving circuit according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a motor drive circuit according to another embodiment of the present application;

FIG. 3 is a schematic diagram of a motor drive circuit according to another embodiment of the present application;

FIG. 4 is a schematic structural diagram of an integrated control device according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of an integrated control device according to another embodiment of the present application;

FIG. 6 is a schematic structural diagram of an integrated control device according to another embodiment of the present application;

Fig. 7 is a schematic structural diagram of an integrated control device according to another embodiment of the present application.

Detailed Description

the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. 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 application.

The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the prior art, the following technical solutions are mostly adopted to control motors respectively, that is, a frequency converter (also called as a frequency conversion circuit) is adopted to control and drive one motor independently. When a plurality of motors (both M1 and M2 in fig. 1 represent motors) are controlled, a plurality of frequency converters are needed, which results in waste of certain devices and increases the cost of a motor driving circuit to a certain extent.

Fig. 1 is a schematic structural diagram of a motor driving circuit 1000 according to an embodiment of the present invention. In the current embodiment, the motor drive circuit 1000 includes: an ac to dc circuit 1100 and an inverter circuit (not shown).

Specifically, the ac-dc converter circuit 1100 includes a rectifying circuit 1110 and a filtering circuit 1130. The input end of the rectifying circuit 1110 is connected to the external power supply 1001, the output end of the rectifying circuit 1110 is connected to the input end of the filter circuit 1130, and the filter circuit 1130 is connected to the inverter circuit. The rectifying circuit 1110 is configured to convert low-voltage ac input to the motor driving circuit 1000 to obtain dc with a preset voltage, that is, to convert ac into dc. The filter circuit 1130 is configured to filter the direct current with the preset voltage output by the rectifier circuit 1110 and output the filtered direct current to the inverter circuit, so that the inverter circuit converts the current output by the filter circuit 1130 into an alternating current with the preset voltage according to the control requirement of the control circuit 1002 and outputs the alternating current to the connected motor 1003. The control circuit is connected to the motor driving circuit 1000, and is configured to control the motor driving circuit 1000 or monitor relevant parameters of the motor driving circuit 1000.

The ac-dc converter circuit 1100 further includes a buffer protection circuit 1120, an input terminal of the buffer protection circuit 1120 is connected to an output terminal of the rectifying circuit 1110, and an output terminal of the buffer protection circuit 1120 is connected to an input terminal of the filter circuit 1130. That is, the output terminal of the rectifying circuit 1110 is connected to the input terminal of the filter circuit 1130 via the buffer protection circuit 1120.

The inverter circuit includes a plurality of IGBT groups 1200 (IGBT) having input terminals connected to the output terminal of the filter circuit 1130, respectively, and output terminals of the plurality of IGBT groups 1200 connected to a motor 1003, respectively, so as to transmit a driving signal to the motor 1003.

The inverter circuit further includes a plurality of IGBT driver chips 1300. The input ends of the plurality of IGBT driver chips 1300 are connected to a control circuit 1002, and the output ends of the IGBT driver chips 1300 are connected to the control end of an IGBT group 1200, and are configured to generate a driving control instruction after receiving a pulse width modulation instruction sent by the control circuit 1002, and send the driving control instruction to the IGBT group 1200. It should be noted that, only two IGBT driver chips 1300 and two IGBT groups 1200 are shown in fig. 1, in other embodiments, the motor driver circuit 1000 provided by the present application may further include three IGBT driver chips 1300 and three IGBT groups 1200, or may include four IGBT driver chips 1300 and four IGBT groups 1200, that is, the specific number of the plurality of IGBT driver chips 1300 and the plurality of IGBT groups 1200 is not limited herein.

the motor driving circuit 1000 further includes a first power conversion circuit 1400, power supply terminals of the first power conversion circuit 1400 are connected to the positive dc bus and the negative dc bus, and an output terminal of the first power conversion circuit 1400 is connected to the driving terminals of the plurality of IGBT groups 1200, for providing driving power to the plurality of IGBT groups 1200.

further, in one embodiment, when a device is needed to overcome the inertia of the motor 1003 when it is stopped, a brake control circuit (not shown in fig. 1) and a solenoid valve (not shown) are further provided. Specifically, the output end of the first power conversion circuit 1400 is further connected to a first input end of a brake control loop, a second input end of the brake control loop is connected to the control circuit 1002, the output end of the brake control loop is connected to a solenoid valve, the output end of the solenoid valve is connected to the motor 1003, and the brake control loop is configured to switch on the first input end and the output end of the brake control loop when receiving a braking instruction of the control circuit 1002, so as to start the solenoid valve to lock the motor connected thereto.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a motor driving circuit according to another embodiment of the present disclosure. The motor drive circuit 2000 provided by the present application further includes: a switch 2001 and a phase loss detection circuit 2002. An input terminal of the switch 2001 is used for connecting the external power supply 2200, and an output terminal of the switch 2001 is connected to an input terminal of the phase loss detection circuit 2002. In the present embodiment, switch 2001 is an air switch for protecting the circuit from burning out due to the current in the circuit exceeding the rated current.

The output end of the open-phase detection circuit 2002 is connected to the ac-to-dc converter circuit 1100, and the open-phase detection circuit 2002 is used for detecting the open phase of the low-voltage ac power input to the motor drive circuit from the external power supply. Specifically, the output end of the open-phase detection circuit 2002 is connected to the rectification circuit 2003, and the output end of the open-phase detection circuit 2002 is further connected to an open-phase detection port (not shown) in a first processing chip (not shown) in the control circuit 2300, so as to feed back the result of the open-phase detection to the first processing chip, thereby further protecting the circuit and avoiding circuit damage caused by access of an open-phase current.

Further, referring to fig. 2, in the present embodiment, the buffer protection circuit (not shown) includes: a snubber contactor 2005 and a snubber resistor 2004 connected in parallel. The buffer contactor 2005 and the buffer resistor 2004 are arranged to delay the current, so that damage to relevant devices due to too large impact on relevant devices caused by too fast current change is avoided.

Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of an embodiment of the motor driving circuit shown in fig. 1 and fig. 2.

Note that, the common dc bus mentioned above refers to a portion marked with black bold in fig. 3. Locations AH, HB, HJ, HP, HK marked in fig. 3 are positive dc busbars of the motor drive circuit provided herein, and CD, QY, WY, YM in fig. 3 are negative dc busbars of the motor drive circuit provided herein. In the motor driving circuit provided by the application, devices on two sides of a positive direct current bus and a negative direct current bus are respectively connected to the positive direct current bus and the negative direct current bus, such as a power conversion circuit 3102, a power conversion circuit 3106, IGBT groups 3103 and 3104 and the like, so that the devices are in a common direct current bus structure, and then when the voltage on the bus rises due to the existing electric energy recovery, other related devices on the bus consume the part of electric energy, and the damage of the related devices or part of circuit structure due to the voltage rise is avoided.

In the embodiment shown in fig. 3, the motor drive circuit 3000 is used to drive different types of motors. Wherein M3 in the definition map is of a different type than M1 and M2. In the embodiment shown in fig. 3, therefore, the motor drive circuit 3000 further includes a second power conversion circuit 3106 for individually performing power conversion for one of the IGBT groups 3105. The input ends of the structures of the second power conversion circuit 3106 and the first power conversion circuit 3102 are connected to the positive dc bus and the negative dc bus for further conversion processing of the power-taking signal from the dc bus.

Specifically, the input end of the second power conversion circuit 3106 is connected to the output end of the first power conversion circuit 3102 in the motor driving circuit, and the output end of the second power conversion circuit 3106 is connected to the power port of the first processing chip, so as to provide driving power for the first processing chip;

the first processing chip further comprises a phase-lack detection port, and the phase-lack detection port is connected with a phase-lack detection circuit in the motor driving circuit and used for receiving a detection result of the phase-lack detection circuit.

Meanwhile, by adopting the structure of the common direct current bus, when the motor 3003 connected with the electromagnetic valve 3004 is locked and the current on the bus side caused by the recovered kinetic energy is increased, the device connected with the direct current bus can consume the part of the electric energy raised by braking, so that the device damage caused by the overlarge current is avoided.

Certainly, in other embodiments, when a motor connected to a certain IGBT group is in a braking state, a certain amount of electric energy is generated, the generated electric energy can return to the dc bus through the IGBT group corresponding to the motor, and is further consumed by the related devices connected to the dc bus.

The first power conversion circuit 3102 converts the electrical signal from the dc bus and provides driving power to the two IGBT groups 3103 and 3104, respectively, which are connected to the first power conversion circuit, wherein the IGBT driving chip is not shown in fig. 3, and please refer to the above related drawings for the connection relationship between the IGBT driving chip and the IGBT group.

Further, with continued reference to fig. 3, in fig. 3, a first resistor 3005 is connected to each output terminal of the IGBT group 3103 to serve as a current test point, where the first resistor 3005 (which is used when detecting current and is between the output terminal of the IGBT group and the input terminal of the motor in the figure) is set for each signal to serve as a current test point, so that the control circuit (not shown in fig. 3) can accurately obtain the current value of the driving signal output by the current IGBT group to the corresponding motor.

Referring to fig. 2 and 3 together, the motor driving circuit provided by the present application can also be used to power the relevant devices in the control circuit. In the embodiment shown in fig. 2 and fig. 3, a third power conversion circuit 2007 is disposed at the output end of the first power conversion circuit 2008, and is used for further converting the electrical signal output from the output end of the first power conversion circuit 2008, so as to obtain an electrical signal that can supply power to the devices in the control circuit 2300. It is understood that, in other embodiments, a power conversion circuit may be separately provided and directly connected to the dc bus, so as to directly convert the electrical signal taken out from the dc bus to obtain a driving signal that can supply power to the devices in the control circuit.

The output end of the second power conversion circuit 2012 is connected to an IGBT group 2011 and a brake control loop 2016, respectively, for providing a driving power to the IGBT group 2011 and the brake control loop 2016. The brake control circuit 2016 includes a first input end and a second input end, the first input end is used for connecting the second power conversion circuit 2012, the second input end is used for connecting the control circuit 2300 (not shown in fig. 3), the output end of the brake control circuit 2016 is connected with a solenoid valve 2017, and the solenoid valve 2017 is connected with a motor 2402. When the second input terminal of the brake control circuit 2016 receives a braking command from the control circuit 2300, the first input terminal and the output terminal of the brake control circuit 2016 are connected, and the solenoid valve 2017 is connected to the complete electrical circuit. The solenoid 2017 is activated to lock the motor for overcoming the inertia created when the motor is shut down. If the motor connected with the solenoid valve 2017 is a take-up motor in a wire drawing machine, the solenoid valve locks the take-up motor when the take-up motor is braked, inertia of the take-up motor during shutdown can be better overcome, and technological abnormity caused by continuous rotation of the take-up motor due to inertia is avoided.

Fig. 4 is a schematic structural diagram of an integrated control device 4000 according to an embodiment of the present disclosure. The integrated control device 4000 provided by the present application is used for controlling a set number of motors. In the current embodiment, the integrated control apparatus 4000 provided in the present application includes: a motor drive circuit 4100 and a control circuit 4300. The control circuit 4300 is a circuit for processing data and sending a control instruction to the motor driving circuit 4100, and may specifically include multiple devices and/or multiple integrated circuit chips.

In the current embodiment, the control circuit 4300 includes: the first processing chip 4301. The first processing chip 4301 includes a set number of pulse width modulation ports (PWM, PWM2, PWM3 in fig. 4), where the set number of pulse width modulation ports is used to output pulse width modulation commands issued by the first processing chip 4301 to the motor driving circuit 4100, and the number of pulse width modulation ports is specifically set according to the attribute of the first processing chip 4401 and the number of motors controlled by the current integrated control apparatus 4000. A set number of pulse width modulation ports are connected to the motor drive circuit 4100, respectively, to output different pulse width modulation commands to the motor drive circuit 4100, respectively.

further, the first processing chip 4301 may be a multi-core processing chip, and in the current embodiment, the first processing chip 4301 includes a dsp (digital Signal processing). It is understood that, in other embodiments, the first processing chip 4301 may also be a single-core chip, and is not particularly limited.

In other embodiments, the control circuit 4300 may also include other related circuits, such as a memory chip 4303, a brake control port 4304, a man-machine port 4302, and a man-machine interaction circuit 4400. Please refer to the following for the structure of the human-computer interaction circuit 4400.

The signal input end of the motor driving circuit 4100 is connected with a set number of pulse width modulation ports in the control circuit 4300, and the motor driving circuit 4100 is a circuit for sending a driving signal to a corresponding motor under the control of the control circuit 4300, so the motor driving circuit 4100 is connected with the external power supply 4001 and the control circuit 4300 respectively. Specifically, the protected preset number of IGBT groups and the preset number of IGBT driver chips in the motor driver circuit 4100 are further defined in this application as a first IGBT group 4006, a second IGBT group 4007, and a third IGBT group 4008. The three groups of IGBT groups are respectively connected with an IGBT driving chip (4003, 4004 and 4005 in fig. 4) and used for outputting driving signals corresponding to the motor connected with the IGBT driving chip under the control of the IGBT driving chip. Wherein, the integrated control device that provides in this application still includes: the first power conversion circuit 4009 and the second power conversion circuit 4011 are respectively used for providing driving signals for different types of motors. The integrated control apparatus provided in the present application further includes: for the specific functions of the brake control circuit 4012 and the solenoid valve 4013, please refer to other related embodiments, which are not described herein.

When the integrated control device provided by the application is used for controlling a plurality of motors in a working line, and when certain relation exists among processes corresponding to the motors in the current working line, the process requirements in the current working line can be stored in the first processing chip in the control circuit in advance. Based on the process requirements in the current line, the need control circuit 4300 needs to calculate and obtain, according to the preset requirements of the wire drawing process and the requirements of the user, the driving signals that need to be configured for each motor under the condition of keeping each process of the whole line to operate normally, and generate corresponding pulse width modulation commands to be output to the motor driving circuit 4100 through the corresponding pulse width modulation ports, so that the motor driving circuit 4100 can output the driving signals meeting the process requirements to each motor.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an integrated control device 5000 according to an embodiment of the present disclosure, a control circuit 5110 is further described in detail in the embodiment shown in fig. 5, and in the embodiment shown in fig. 5, the integrated control device is used for performing integrated control on a wire drawing machine.

The first processing chip 5111 further includes a tension detection port 5013, a zero clearing detection port 5015, a commutation detection port 5018, and a current detection port 5022.

The tension detection port 5013 is connected to the tension detection component 5014, and is used for acquiring a tension signal fed back by the tension detection component 5014. The tension detection component 5014 is used for acquiring tension change conditions in the drawn wire product, the tension detection component 5014 feeds back the tension conditions in the drawn wire product obtained through the tension detection port 5013 to the first processing chip 5111 in the form of tension signals, so that the first processing chip 5111 can judge whether the tension on the product being processed on the drawing machine meets the requirement of tension balance according to the tension signals, judge whether the output driving signal of at least one motor needs to be adjusted or calculate the motor frequency by taking the tension conditions as a reference, and adjust the motor frequency based on a PID feedback principle. The tension detecting member 5014 is disposed behind the tension member driven by the tension motor and in front of the take-up pulley controlled by the take-up motor.

Among them, the tension detecting member 5014 includes a tension swing lever device and an impulse detecting member.

When the tension detection component 5014 is a tension swing link, a tension detection port 5013 is correspondingly disposed in the first processing chip 5111, and is configured to receive a tension signal fed back by the tension swing link, where the form of the tension signal fed back by the tension swing link is a feedback voltage. After the first processing chip 5111 obtains the feedback voltage fed back by the tension swing rod, the first processing chip 5111 queries a real-time frequency difference corresponding to the feedback voltage to calculate and obtain the real-time frequency difference of the motor before and after the set position of the tension swing rod. After the real-time frequency difference is obtained, the real-time frequency difference is compared with a calibrated real-time frequency difference meeting the tension balance requirement, so as to judge whether the tension in the current product meets the tension balance requirement. When the requirement of tension balance is judged to be met, the tension condition of the current product is continuously monitored; and when the tension balance requirement is judged not to be met, further adjusting the frequency of at least one motor to enable the tension in the current product to meet the tension balance requirement. The storage area in the first processing chip 5111 or the storage chip accessible to the first processing chip 5111 may store the implementation frequency difference corresponding to the feedback voltage and the calibrated real-time frequency difference corresponding to the drawn wire product satisfying the tension balance in advance, where the implementation frequency difference corresponding to the feedback voltage is set based on an empirical value.

When the tension detection part 5014 is a pulse detection part, since the pulse detection part includes a first pulse part and a second pulse part, two tension detection ports 5013 are correspondingly disposed on the first processing chip 5111, and are respectively used for acquiring the number of pulses acquired by the pulse detection part. Wherein the first pulse component is arranged at the fixed speed wheel behind the stretching component driven by the stretching motor, and the second pulse component is arranged at the guide wheel. At this time, the form of the tension signal acquired by the tension detection port 5013 is the pulse number fed back by the pulse detection component, and when the first processing chip 5111 acquires the pulse numbers fed back by the two pulse detection components, the acquired pulse numbers are respectively converted into the corresponding real-time stretching motor frequency and the real-time wire rewinding motor frequency, and then the real-time frequency difference is obtained based on the real-time stretching motor frequency and the real-time wire rewinding motor frequency. After the real-time frequency difference is obtained, the obtained real-time frequency difference is compared with the set calibrated real-time frequency difference, so as to judge whether the tension in the current product meets the tension balance requirement.

When the first processing chip 5111 determines that the tension in the current product does not satisfy the requirement of tension balance, the target frequency of a certain motor outputting the requirement of the user is calculated and obtained according to the requirement of tension balance and the relationship among the frequencies of the drawing motor, the take-up motor and the wire arranging motor in the wire drawing machine, and when the tension balance is satisfied, the target frequencies of other motors are obtained.

Specifically, when the target frequency of the stretching motor is known, the method for calculating the target take-up motor frequency and the target winding displacement motor frequency is as follows:

Step 1: and acquiring the frequency of the target stretching motor.

Step 2: and acquiring a tension signal fed back by the tension detection device, and calculating the auxiliary frequency according to the tension signal.

And step 3: and calculating the main frequency based on the acquired stretching motor frequency.

and 4, step 4: and summing the main frequency and the auxiliary frequency to obtain the target take-up motor frequency.

and 5: and calculating to obtain the target winding displacement motor frequency based on the target winding displacement motor frequency and preset parameters. Wherein step 5 further comprises:

1) And calculating the speed of the take-up motor corresponding to the target take-up motor frequency. And under the condition that the target wire rewinding motor frequency is obtained, calculating the motor frequency according to the relation between the motor frequency and the motor speed, and specifically calculating the wire rewinding motor speed by referring to the following formula.

n1＝60*f1/p

Wherein f1 is the obtained target take-up motor frequency, p is the magnetic pole pair number of the motor, and n1 is the take-up motor rotating speed corresponding to the target take-up motor frequency, and the unit is revolutions per minute.

2) And calculating to obtain the target winding displacement motor frequency based on the winding displacement motor speed, the lead of the lead screw and the pitch.

And calculating to obtain the target winding displacement motor frequency based on the winding displacement motor speed calculated in the step S6521 and the lead of the screw rod and the pitch in the preset parameters. Specifically, the calculation is performed according to the following formula:

n2＝n1*nSpaceRoute/nLSRoute

Where n2 is the target winding displacement motor speed, n1 is the winding displacement motor speed corresponding to the target winding displacement motor frequency obtained in the above steps, the unit is rpm, nSpaceRoute represents the preset pitch, nlroute is the lead of the lead screw, nSpaceRoute/nlroute represents the ratio of the winding displacement motor speed to the winding displacement motor speed, so the target winding displacement motor speed is obtained by multiplying the winding displacement motor speed corresponding to the target winding displacement motor speed by the ratio of the winding displacement motor speed to the winding displacement motor speed.

after the target winding displacement motor rotation speed is obtained, the target winding displacement motor frequency is further obtained according to the following formula. The formula:

f＝n2*h/60

Where f is the target traverse motor frequency, n2 is the rotational speed of the target traverse motor calculated as described above, h is the number of motor teeth, h is 50 in the present embodiment, and 60 is 60 seconds. When the wire drawing machine is in operation, the target wire arranging motor frequency can be corrected based on the obtained target wire arranging motor frequency.

With continued reference to fig. 5, the clear detection port 5015 of the first processing chip 5111 is connected to the midpoint switch 5016 of the lead screw. The wire arranging rod is a component for assisting wire arrangement, and the midpoint switch 5016 is arranged at the midpoint of the wire arranging rod. When the moving member on the lead screw contacts the midpoint switch 5016 in the moving process, a high level (in other embodiments, a low level may be used) is triggered, and a high level signal is fed back to the first processing chip 5111 through the clear detection port 5015 to clear the number of pulses before the midpoint switch 5016, so that the accumulation of errors can be reduced.

The commutation detection port 5018 of the first processing chip 5111 is connected to the limit switches 5017 arranged on the two sides of the lead screw. The commutation detection port 5018 includes a forward commutation detection port (not shown) and a reverse commutation detection port (not shown), the limit switch 5017 includes a forward limit switch (not shown) and a reverse limit switch (not shown), the forward limit switch and the reverse limit switch are respectively disposed on two sides of the lead screw, and are respectively connected to the forward commutation detection port and the reverse commutation detection port, when the moving element on the lead screw moves to two sides of the lead screw to touch the limit switch under the driving of the winding displacement motor, the limit switch is triggered to be closed (in other embodiments, the limit switch may also be triggered to be opened). When the limit switch 5017 is closed, the commutation detection port 5018 corresponding to the limit switch 5017 detects a high level ((in other embodiments, it may be a low level)), and outputs the high level to the first processing chip 5111, so that the first processing chip 5111 generates a control command for controlling the reverse rotation of the cable motor, and sends the control command to the circuit structure for controlling the cable motor in the motor driving circuit 5300, so as to control the reverse rotation of the cable motor.

The current detection port 5022 is used to obtain the current output from the motor driver 5300 to the motor, so that the first processing chip 5111 can determine whether the current finally output to the motor is abnormal or not, or determine whether the current finally output to the current motor is the current calculated by the control circuit 5100 or not. Since the drawing motor, the wire winding motor, and the wire discharging motor are controlled by the wire drawing machine integrated control device 5000 in the current embodiment, the current detection port 5022 may respectively detect current values corresponding to driving signals finally sent to each motor (wherein the motors include a motor 5024, a motor 5025, and a motor 5026 as shown in the figure). When the first processing chip 5111 detects that the current sent to a certain motor is abnormal through the current detection port 5022, the information is further sent to the man-machine interaction circuit 5012 through the man-machine port 5010, and then is fed back to a user in a man-machine interface mode through the output end of the man-machine interaction circuit 5012, or an alarm is triggered, or a control instruction of temporary halt is generated by the first processing chip 5111 to control the wire drawing machine to halt, and then the reason for the abnormality is detected by the user.

the current detection port is also used for realizing overcurrent protection from software so as to avoid abnormal damage of a circuit caused by overlarge current.

It is understood that in other embodiments, the first processing chip 5111 of the integrated control device 5000 of the drawing machine provided by the present application further includes: a voltage detection port (not shown) and a regulated voltage input port (not shown).

the first processing chip 5111 further includes a brake control port 5027, where the brake control port 5027 is connected to a second input terminal of a brake control loop (not shown) and is configured to output a brake control command to the brake control loop in the motor driver circuit 5300 through the port, so that the brake control loop conducts a first input terminal and an output terminal of the brake control loop to drive an electromagnetic valve (not shown) connected to the output terminal of the brake control loop, so as to lock the wire winding motor and consume inertia of the wire winding motor when the wire winding motor is stopped. Specifically, the output end of the brake control loop is connected with an electromagnetic valve, and the electromagnetic valve is connected with a take-up motor.

The first processing chip 5111 further includes a human-machine port 5010 for connecting with the human-machine interaction circuit 5012, so that the first processing chip 5111 realizes communication and data interaction with the human-machine interaction circuit 5012. Specifically, the human-computer interaction circuit 5012 includes a structure as described in the following part of the human-computer interaction circuit 5012.

With continued reference to fig. 5, the first processing chip 5111 further includes: the expansion interface 5011. The expansion interface 5011 is used to provide an interface for the expansion function of the apparatus. Specifically, the expansion interface 5011 may be externally connected to a chip capable of performing, for example, simple signal processing, and is used for performing level conversion assistance on a simple signal. In other embodiments, the expansion interface 5011 may further connect to an ARM chip with a low end, which may reduce the load and resource pressure of the motherboard CPU in the human-computer interaction circuit 5012.

the first processing chip 5111 further includes: the jog switch port 5004 and the reset port 5001, and the jog switch port 5004 is connected to a jog switch (not shown) for obtaining a command output by the jog switch. When a user inputs a jog command through the jog switch, and the first processing chip 5111 obtains the command input by the jog switch through the jog switch 5004, a pulse width modulation command capable of driving the motors to advance a bit (which may be defined as one step in other embodiments) is generated based on the jog command and output to the motor driving circuit 5300, so that the motor driving circuit 5300 generates a driving control command for controlling each motor to advance a preset distance. Among them, it should be noted that the jog switch is usually activated when threading is performed before the start of the adjustment or the drawing machine.

The first processing chip also includes a speed setting port 5005, and the speed setting port 5005 is used for acquiring the speed at which the user desires the motor to operate. In the current embodiment, the speed setting port is connected with a knob switch in the integrated control device of the wire drawing machine, and is used for acquiring the target stretching motor frequency input by a user through the knob switch.

The first processing chip further includes: memory chip port 5006. The memory chip port 5006 is used for connecting to a memory chip. The connected memory chip is used for storing an algorithm corresponding to a function that needs to be executed by the first processing chip 5111, or data acquired by the first processing chip 5111 or a result of calculation.

The reset port 5001 is connected to a reset switch for outputting an instruction to the first processing chip 5111 to reset the relevant data of the first processing chip 5111. Wherein the relevant data comprises: and (5) metering the drawn wire. In other embodiments, the reset switch is also used for resetting the fault alarm, that is, when a fault occurs in the wire drawing machine or the integrated control device, the fault alarm is generated, and when the current fault is solved, the fault alarm can be cleared by the reset switch.

the first processing chip 5111 further includes: open-phase detection port 5007 and bus voltage detection port 5008. The open-phase detection port 5007 is connected to an output terminal of the open-phase detection circuit in the motor drive circuit 5300, and is configured to obtain a detection result of the open-phase detection circuit. When it is detected that the electrical signal input to the motor driver circuit 5300 by the external power circuit has a phase failure, the detection result is fed back to the first processing chip 5111 through the phase failure detection port, and after receiving the detection result, the first processing chip 5111 correspondingly generates a control instruction or other instructions for temporary shutdown, so as to prompt a user to perform maintenance. The bus voltage detection port 5008 is used to obtain voltage feedback on the dc bus, and determine whether the voltage of the dc bus is abnormal.

The first processing chip 5111 further includes a debug port 5009, wherein the debug port is used for debugging or updating program data in the integrated control device.

The first processing chip 5111 further includes a buffer contact port 5019, wherein the buffer contact port 5019 is connected to a buffer protection circuit (not shown in fig. 5) in the motor driver circuit 5300 to control the buffer protection circuit to protect the circuit, so as to prevent the subsequent components from being damaged due to excessive impact caused by too fast current change.

The first processing chip also protects a temperature detection port 5021, and the temperature detection port 5021 is connected to a temperature sensor 5020. In the present embodiment, the temperature sensor 5020 is disposed on the motor driver 5300 of the integrated control device of the drawing machine, specifically on the surface of the heat generating device in the motor driver 5300, for monitoring the temperature of the heat generating device, and feeding back to the first processing chip 5111 to monitor the temperature of the heat generating device in the motor driver 5300, and when the temperature of the heat generating device is monitored to be higher than a preset alarm value, the first processing chip will initiate an alarm measure. Specifically, the alarm measures include: an alarm is sounded, or the driving of the motor is suspended.

In other embodiments, the temperature sensor 5020 can also be arranged at other positions where temperature detection is required. Such as somewhere in the cooling system of the drawing machine, for monitoring the temperature of the cooling liquid in the cooling system in real time.

The first processing chip 5111 further includes EST port 5002, RUN port 5003 and LED ports. The EST port is an emergency stop port, the RUN port is a starting port, and the LED port is used for being connected with an indicator lamp. In the current embodiment, the stop port is integrated with the RUN port into one port.

Correspondingly, in the present embodiment, after the first processing chip 5111 in the control circuit 5110 calculates and obtains each motor frequency, the first processing chip 5111 calculates and converts to obtain the pulse width modulation command sent to the motor driving circuit 5300, and the pulse width modulation command is sent from the pulse width modulation port (PWM1, PWM2, PWM3) and output to the IGBT driving chip 5121. After the IGBT driver chip 5121 (or the IGBT driver chip 5122 and the IGBT driver chip 5123) in the motor driver circuit 5300 obtains the pulse width modulation instruction, a driving instruction for controlling the on/off of each IGBT in the IGBT group 5321, the IGBT group 5322, and the IGBT group 5323 is generated based on the pulse width modulation instruction, so that the corresponding IGBT can output a corresponding driving signal to the connected motor 5024, motor 5025, and motor 5026.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a man-machine interaction circuit 6000 according to an embodiment of the integrated control device of a wire drawing machine of the present application. In the present embodiment, the man-machine interaction circuit 6000 is connected to the first processing chip 6012, and specifically, the man-machine interaction circuit 6000 is connected to the first processing chip 6012 through an RS485 interface 6013 and an RJ45 port 6012, specifically, connected to a man-machine port on the first processing chip 6012.

the human-computer interaction circuit 6000 includes a second processing chip 6001, a PHY chip 6005, and/or a wireless chip 6008. The PHY chip 6005 and/or the wireless chip 6008 are connected to the second processing chip 6001.

The PHY chip 6005 is configured to provide a communication port for communication between an external terminal and the human-computer interaction circuit 6000, and specifically, an output end of the PHY chip 6005 is sequentially connected to a network transformer 6006 and an RJ45 communication interface 6007. The PHY chip 6006 is used for data exchange between the switch and the drawing machine integrated control device. The wireless chip 6008 is connected to the second processing chip 6001, and is configured to communicate between the human-computer interaction circuit 6000 and an external terminal, where the external terminal includes a mobile phone, a tablet computer, a notebook computer, and the like.

With continued reference to fig. 6, the human-computer interaction circuit 6000 further includes a FLASH chip 6003, a battery 6004, buttons 6014, and a display screen 6002. In the present embodiment, there are 9 buttons 6014, which are used for a user to input other related instructions to the human-computer interaction circuit 6000 through the buttons 6014, and the instructions are converted and output to the first processing chip by the human-computer interaction circuit or directly processed by the human-computer interaction circuit and complete feedback.

The man-machine interaction circuit 6000 further comprises a main crystal oscillator 6011, an RTC crystal oscillator 6010 and a USB interface 6009. The master crystal oscillator 6011 is configured to provide a clock for the first processing chip, and the RTC crystal oscillator 6010 is configured to provide time data for the integrated control device of the drawing machine. The USB interface 6009 is used to provide a compatible interface when a user needs to load relevant data into the device through the devices of the USB interface 6009.

referring to fig. 7, in the present embodiment, the integrated control apparatus provided in the present application further includes: the assembly 7000 is cooled. Fig. 7 is a schematic diagram of a cooling module 7000, the cooling module 7000 being arranged adjacent to one side of the motor driving circuit and separated from the motor driving circuit by a heat conductive, waterproof and dustproof material. Cooling assembly 7000 includes a housing chamber 7003 provided with an inlet 7001 and an outlet 7002. The cooling liquid enters the accommodating cavity 7003 through the inlet 7001 of the accommodating cavity, flows out from the outlet through the path defined by the accommodating cavity 7003, and transfers heat generated in the working process of the motor driving circuit in the process, so that the integrated control device is cooled.

It will be appreciated that in other embodiments, the internal conduits of the cooling module may be arranged as a plurality of conduits running in parallel, which may be adjusted according to the actual requirements.

The integrated control device provided by the application adopts a port convenient for plugging and unplugging. The port which is convenient to plug and unplug can realize quick disassembly or replacement when a user installs the integrated control device or maintains the integrated control device.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (10)

1. A motor drive circuit, characterized in that the motor drive circuit comprises: an AC-to-DC circuit and an inverter circuit;

The alternating current-to-direct current circuit comprises a rectifying circuit and a filter circuit, wherein the input end of the rectifying circuit is used for being connected with an external power supply, and the output end of the rectifying circuit is connected with the input end of the filter circuit;

The inverter circuit comprises a plurality of IGBT groups, the input ends of the IGBT groups are respectively connected to the output end of the filter circuit, and the output ends of the IGBT groups are respectively connected with a motor so as to send driving signals to the motor.

2. The motor drive circuit according to claim 1, wherein the ac-dc converter circuit further includes a buffer protection circuit, and an output terminal of the rectifier circuit is connected to an input terminal of the filter circuit via the buffer protection circuit.

3. The motor drive circuit of claim 2, wherein the snubber protection circuit comprises: the buffer contactor and the buffer resistor are connected in parallel.

4. The motor driving circuit according to claim 1, wherein the inverter circuit further comprises a plurality of IGBT driver chips, input ends of the plurality of IGBT driver chips are connected to a control circuit, and output ends of the IGBT driver chips are connected to a control end of the IGBT group, and configured to generate a driving control command and send the driving control command to the IGBT group after receiving a pulse width modulation command sent by the control circuit.

5. The motor driving circuit according to claim 4, further comprising a first power conversion circuit, wherein an input end of the first power conversion circuit is connected to the positive DC bus and the negative DC bus, and an output end of the first power conversion circuit is connected to the driving ends of the plurality of IGBT groups for providing driving power for the plurality of IGBT groups.

6. The motor driving circuit according to claim 5, wherein the output terminal of the first power conversion circuit is further connected to a first input terminal of a brake control circuit, a second input terminal of the brake control circuit is connected to the control circuit, an output terminal of the brake control circuit is connected to a solenoid valve, an output terminal of the solenoid valve is connected to the motor, and the brake control circuit is configured to, when receiving a braking instruction from the control circuit, turn on the first input terminal and the output terminal of the brake control circuit to start the solenoid valve to lock the motor.

7. The motor drive circuit according to claim 1, further comprising: switch and default phase detection circuitry, the input of switch is used for connecting external power source, the output of switch is connected default phase detection circuitry's input, default phase detection circuitry's output is connected exchange and change direct current circuit, default phase detection circuitry is used for right external power source input motor drive circuit's low-voltage alternating current carries out the default phase and detects.

8. An integrated control device, characterized in that the integrated control device is used for controlling a set number of motors;

The device comprises: a motor drive circuit and a control circuit;

the control circuit includes: the first processing chip comprises the set number of pulse width modulation ports, and the set number of pulse width modulation ports are respectively connected with the motor driving circuit so as to respectively output pulse width modulation instructions to the motor driving circuit;

The motor driving circuit is as claimed in any one of claims 1 to 7, and is configured to, when receiving the pulse width modulation commands output by the set number of pulse width modulation ports, respectively output driving signals corresponding to the pulse width modulation commands to the set number of motors.

9. The integrated control device according to claim 8, wherein the motor driving circuit further comprises a second power conversion circuit, an input terminal of the second power conversion circuit is connected to an output terminal of a first power conversion circuit in the motor driving circuit, and an output terminal of the second power conversion circuit is connected to the power port of the first processing chip, for providing driving power to the first processing chip;

The first processing chip further comprises a phase-lack detection port, and the phase-lack detection port is connected with a phase-lack detection circuit in the motor driving circuit and used for receiving a detection result of the phase-lack detection circuit.

10. The integrated control device according to claim 8, wherein the first processing chip further comprises a human-machine port, and the human-machine port is connected with a human-machine interaction circuit;

The man-machine interaction circuit comprises: the PHY and/or the wireless chip are connected with the second processing chip, the PHY is used for providing a communication port for communication between an external terminal and the man-machine interaction circuit, and the wireless chip is used for communication between the man-machine interaction circuit and the external terminal.