Servo driver and servo punching machine control system

Abstract

The utility model provides a servo driver and a servo punching machine control system, the servo driver comprises a rectification module, an inversion module, a transition module and an energy storage module, through the arrangement of the transition module and the energy storage module, redundant energy in the operation process of the servo driver is stored and is released and utilized at a proper moment, and the service life of the servo punching machine is prolonged. And the energy utilization efficiency of the servo driver is enhanced.

Description

Technical Field

[0001] The present application relates to the field of servo punching machines, and in particular to a servo driver and a servo punching machine control system. Background Art

[0002] In the field of servo punch control systems, energy management is very important. In the prior art, large-capacity electrolytic capacitors and brake resistors are usually set on the busbar of the servo drive to store or consume the excess voltage on the busbar, but this will cause a waste of this part of the electrical energy, making the overall energy utilization efficiency of the system low. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a servo driver, comprising:

[0004] A rectifier module receives an AC voltage and is used to rectify the AC voltage into a DC voltage;

[0005] An inverter module, connected to the rectifier module via a bus bar, and used for inverting the DC voltage into a drive signal;

[0006] A transition module, connected to the bus, and used to obtain the voltage of the bus;

[0007] An energy storage module is connected to the transition module, and the transition module charges the energy storage module according to the voltage of the bus, or the energy storage module discharges through the transition module according to the voltage of the bus.

[0008] In one embodiment, the transition module comprises:

[0009] A switch module, connected to the bus, and used to convert the voltage of the bus into a first voltage;

[0010] The buffer module is connected with the switch module and the energy storage module.

[0011] In one embodiment, the buffer module includes a first inductor for buffering charging of the energy storage module and discharging of the energy storage module.

[0012] In one embodiment, the energy storage module includes a plurality of battery cells connected in parallel for storing electrical energy.

[0013] In one embodiment, the servo driver further includes a control chip, and the control chip is used to control the transition module to charge the energy storage module when it is determined that the voltage of the bus is greater than or equal to a first preset voltage.

[0014] In one embodiment, the control chip is used to stop charging the energy storage module when it is determined that the voltage of the energy storage module is greater than or equal to a second preset voltage.

[0015] In one embodiment, the control chip is used to control the energy storage module to discharge the transition module when it is determined that the voltage of the bus is less than or equal to a third preset voltage.

[0016] In one embodiment, the control chip is used to control the energy storage module to stop discharging the transition module when it is determined that the discharge voltage of the energy storage module is less than or equal to a second preset voltage.

[0017] In one embodiment, the AC voltage received by the rectifier module includes a three-phase AC voltage, and the rectifier module receives three single-phase AC voltages through three input terminals respectively.

[0018] In order to solve the above technical problems, the present application provides a servo punch control system, comprising a servo driver, an AC power supply and a motor in any one of the above embodiments.

[0019] The AC power supply is connected to the servo drive and is used to supply power to the servo drive;

[0020] The motor is connected to the servo driver, and the servo driver is used to drive the motor.

[0021] The beneficial effect of this solution is that by setting up a transition module and an energy storage module, excess energy during the operation of the servo drive is stored and released for utilization at the appropriate time, thereby enhancing the energy utilization efficiency of the servo drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present application will be further described below in conjunction with the accompanying drawings and implementation methods, in which:

[0023] Figure 1 It is a schematic diagram of the framework of the first embodiment of the servo driver of the present application;

[0024] Figure 2 It is a schematic diagram of the framework of the second embodiment of the servo driver of the present application;

[0025] Figure 3 is a circuit diagram of the first embodiment of the switch module of the present application;

[0026] Figure 4 It is a schematic diagram of the framework of the first embodiment of the servo punch control system of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It will be appreciated that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some but not all structures related to the present application are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present application.

[0028] The terms "first", "second", "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of this application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] Typically, the busbar of a servo drive is provided with a large-capacity electrolytic capacitor and a braking resistor for storing and consuming the extra electrical energy generated by the servo drive. However, the charging and discharging depth of the large-capacity electrolytic capacitor is limited, which may cause part of the electrical energy to be consumed through the braking resistor, resulting in a waste of this energy.

[0031] In view of this, the present application provides a servo drive to solve the above technical problems.

[0032] See also Figure 1 , Figure 1It is a schematic diagram of the framework of the first embodiment of the servo driver of the present application, including a rectifier module 11, an inverter module 12, a transition module 13 and an energy storage module 14.

[0033] The rectifier module 11 receives an AC voltage and is used to rectify the AC voltage into a DC voltage. Optionally, the rectifier module 11 may include a rectifier diode and a filter, which rectifies and filters the AC power provided by the power source and transmits it to subsequent loads through the bus 15 to provide a DC voltage for the subsequent loads.

[0034] The inverter module 12 is connected to the rectifier module 11 via the bus 15, and is used to invert the DC voltage into a drive signal. Optionally, the inverter module 12 may include a bridge inverter circuit to invert the DC voltage signal transmitted by the bus 15 into an AC voltage signal, that is, a drive signal, and use the drive signal to drive subsequent loads.

[0035] The inverter module 12 and the rectifier module 11 are arranged in a front-to-rear correspondence, so as to convert an input AC signal with a fixed voltage into a driving signal with a required AC voltage.

[0036] The transition module 13 is connected to the bus 15 for receiving the voltage of the bus 15 ; the energy storage module 14 is connected to the transition module 13 , and the transition module 13 charges the energy storage module 14 according to the voltage of the bus 15 , or the energy storage module 14 discharges through the transition module 13 according to the voltage of the bus 15 .

[0037] A transition module 13 is provided between the busbar 15 and the energy storage module 14, so as to charge the energy storage module 14 with a suitable DC voltage, thereby facilitating the management and maintenance of the servo drive.

[0038] Optionally, the transition module 13 in this case can be replaced by a common DCDC (Direct Current To Direct Current, direct current conversion) chip.

[0039] The servo driver provided in this embodiment includes: a rectifier module 11, an inverter module 12, a transition module 13 and an energy storage module 14. The transition module 13 charges the energy storage module 14 according to the voltage of the bus 15, or the energy storage module 14 discharges through the transition module 13 according to the voltage of the bus 15. By providing the transition module 13 and the energy storage module 14, the excess electric energy on the bus 15 is stored and released back to the bus 15 at an appropriate time, thereby improving the energy utilization rate of the servo driver.

[0040] See also Figure 2 , Figure 2It is a schematic diagram of the framework of the second embodiment of the servo driver of the present application. The rectifier module 11, the inverter module 12 and the energy storage module 14 in this embodiment are consistent with those in the first embodiment, so they are not described in detail.

[0041] The transition module 13 includes a switch module 131 and a buffer module 132. The switch module 131 is connected to the bus 15 and is used to convert the voltage of the bus 15 into a first voltage. Optionally, the switch module 131 controls the voltage conduction of the bus 15 while consuming almost no transmitted electric energy. For example, it includes two transistors connected in series, one of which is connected in parallel with the subsequent energy storage module 14. The voltage across the transistor is the first voltage, and the value of the first voltage is close to the voltage of the bus. The voltage of the bus 15 is converted into the first voltage through the switch module 131. The switch module 131 is mainly used to control the voltage conduction and blocking of the bus 15.

[0042] The buffer module 132 is connected to the switch module 131, and is used to buffer the charging of the energy storage module 14 by the transition module 13 or the discharging of the energy storage module 14 through the transition module 13. Optionally, the buffer module 132 includes a first inductor, which is used to buffer the charging of the energy storage module 14 and the discharging of the energy storage module 14. The first inductor hinders the change of the passing current, and can extend the time for the transition module 13 to charge the energy storage module 14 and extend the time for the energy storage module 14 to discharge through the transition module 13. Considering that the voltage rise or fall of the bus 15 caused by the external pressure on the servo drive is a continuous process rather than an instantaneous process, the buffer module 132 is set to delay the rate of change of the first voltage to protect the subsequent energy storage module 14.

[0043] The energy storage module 14 includes a plurality of battery cells connected in parallel for storing electrical energy. A battery cell is equivalent to a capacitor, which can store electrical energy. A plurality of battery cells connected in parallel is equivalent to a plurality of capacitors connected in parallel, which have a larger electrical capacity. Optionally, the number of battery cells connected in parallel can be set according to actual conditions.

[0044] After the voltage of the bus 15 is converted into a first voltage by the switch module 131, the energy storage module 14 is charged by the buffer module 132. By setting the buffer module 132 as a first inductor, the charging rate of the energy storage module 14 can be slowed down to prevent the energy storage module 14 from being damaged due to excessive changes in the charging voltage. The energy storage module 14 includes a plurality of battery cells connected in parallel, and the number of battery cells can be set according to actual needs, so that the management and maintenance of the energy storage module 14 are more convenient.

[0045] The servo drive stores the excess voltage of the bus 15 by providing the transition module 13 and the energy storage module 14, and then reuses it, thereby improving the efficiency of energy utilization of the servo drive.

[0046] In some embodiments of the present application, the servo driver further includes a control chip (not shown in the figure). The control chip is connected to the bus 15 , the transition module 13 and the energy storage module 14 , and can detect the voltages of the bus 15 , the transition module 13 and the energy storage module 14 .

[0047] Optionally, the control chip may be a chip such as a CPU (Central Processing Unit) or an MCU (Microcontroller Unit) that can control other units.

[0048] The control chip is used to control the transition module 13 to charge the energy storage module 14 when it is determined that the voltage of the bus 15 is greater than or equal to the first preset voltage. When the servo drive is subjected to external pressure and the voltage of the bus 15 increases, before it increases to the first preset voltage, the control chip controls the transition module 13 not to charge the energy storage module 14. For example, the transition module 13 includes a transistor, and the control chip is connected to the base of the transistor, so that the current value output by the control chip is less than the threshold current value for turning it on, so that the transistor can be controlled not to turn on, and then the transition module 13 does not charge the energy storage module 14; when the voltage of the bus 15 increases to the first preset voltage, the control chip controls the transition module 13 to charge the energy storage module 14. By setting up a control chip, a transition module 13 and an energy storage module 14, when the voltage of the bus 15 increases to a first preset voltage, the energy storage module 14 can be charged through the transition module 13, thereby avoiding safety accidents caused by excessive voltage of the bus 15. At the same time, the excess electric energy is stored in the energy storage module 14 and then released, thereby ensuring efficient energy utilization of the servo drive.

[0049] In some embodiments of the present application, the control chip is used to stop charging the energy storage module 14 when it is determined that the voltage of the energy storage module 14 is greater than or equal to the second preset voltage. When the transition module 13 continues to charge the energy storage module 14, the voltage of the energy storage module 14 gradually increases. When the voltage is greater than or equal to the second preset voltage, it means that the energy storage module 14 is close to the upper limit of the charging capacity, and the control chip controls the transition module 13 to stop charging the energy storage module 14.

[0050] Optionally, the charging capacity of the energy storage module 14 may be the capacity of a capacitor included in the energy storage module 14 . The charging capacity of the energy storage module 14 may be increased by connecting a greater number of battery cells in parallel.

[0051] By setting up a control chip, a transition module 13 and an energy storage module 14, the voltage of the bus 15 charges the energy storage module 14 through the transition module 13, and the excess electric energy is stored and then released, thereby improving the energy utilization efficiency of the servo drive. When the control chip determines that the voltage of the energy storage module 14 is greater than or equal to the second preset voltage, it stops charging the energy storage module 14 to prevent damage to the energy storage module 14 and safety problems caused by overcharging.

[0052] In some embodiments of the present application, the control chip is used to control the energy storage module 14 to discharge through the transition module 13 when it is determined that the voltage of the bus 15 is less than or equal to the third preset voltage. When the voltage of the bus 15 continuously charges the energy storage module 14 through the transition module 13, the voltage of the energy storage module 14 gradually increases with the charging process, and the voltage of the bus 15 gradually decreases with the charging process. When the voltage of the bus 15 decreases to less than or equal to the third preset voltage, that is, close to the lower limit of the voltage of the bus 15, if it is lower than the third preset voltage, it is difficult for the servo drive to continue to work normally. At this time, the control chip controls the energy storage module 14 to discharge through the transition module 13. After the electric energy passes through the transition module 13 from the energy storage module 14 to the bus 15, the voltage of the energy storage module 14 decreases, and the voltage of the bus 15 increases.

[0053] By setting the control chip, transition module 13 and energy storage module 14, when the voltage of the bus 15 drops to less than or equal to the third preset voltage, the electric energy stored in the energy storage module 14 can be used to discharge to the bus 15, thereby realizing the reuse of excess electric energy and improving the energy utilization rate of the servo drive.

[0054] In some embodiments of the present application, the control chip is used to control the energy storage module 14 to stop discharging when it is determined that the voltage of the energy storage module 14 is less than or equal to the fourth preset voltage. When the energy storage module 14 continues to discharge, the voltage of the energy storage module 14 gradually decreases, and the voltage of the bus 15 gradually increases. When the voltage of the energy storage module 14 drops to less than or equal to the fourth preset voltage, that is, close to the lower limit of the voltage of the energy storage module 14, continued discharge will affect the normal operation of the energy storage module 14, and the control chip controls the energy storage module 14 to stop discharging.

[0055] By setting the control chip, transition module 13 and energy storage module 14, when the voltage of the energy storage module 14 drops to less than or equal to the fourth preset voltage, the energy storage module 14 no longer discharges, thereby reducing the possibility that the energy storage module 14 cannot work normally due to excessive discharge.

[0056] In the above embodiment, it may happen that during the continuous charging of the energy storage module 14, the voltage of the energy storage module 14 is still less than the second preset voltage, but the control chip determines that the voltage of the bus 15 is less than or equal to the third preset voltage. At this time, the priority of the energy storage module 14 to discharge through the transition module 13 is higher than the priority of the transition module 13 to charge the energy storage module 14. Then the control chip controls the energy storage module 14 to stop charging and discharge through the transition module 13 instead.

[0057] In the above embodiment, it may also happen that during the continuous discharge of the energy storage module 14, the voltage of the energy storage module 14 is still greater than the fourth preset voltage, but the control chip determines that the voltage of the bus 15 is greater than or equal to the first preset voltage. At this time, the priority of the transition module 13 charging the energy storage module 14 is higher than the priority of the energy storage module 14 discharging through the transition module 13. The control chip controls the energy storage module 14 to stop discharging, and controls the voltage of the bus 15 to charge the energy storage module 14 through the transition module 13.

[0058] To sum up, in the servo driver provided in the above embodiment, the voltage of the bus 15 is set with an upper limit value and a lower limit value, corresponding to the first preset voltage and the third preset voltage. When the control chip determines that the voltage of the bus 15 exceeds or is equal to the upper limit value, the voltage of the bus 15 is controlled to discharge to reduce the voltage of the bus 15. When the control chip determines that the voltage of the bus 15 is less than or equal to the lower limit value, the voltage of the bus 15 is controlled to accept charging to increase the voltage of the bus 15. The voltage of the energy storage module 14 is also set with an upper limit value and a lower limit value, corresponding to the second preset voltage and the fourth preset voltage. When the control chip determines that the voltage of the energy storage module 14 exceeds or is equal to its upper limit value, the transition module 13 is controlled to stop supplying power to the energy storage module 14. When the control chip determines that the voltage of the energy storage module 14 is less than or equal to its lower limit value, the energy storage module 14 is controlled to stop discharging through the transition module 13.

[0059] By setting the control chip, the transition module 13 and the energy storage module 14, the voltage of the bus 15 can charge the energy storage module 14 through the transition module 13 when the voltage is of an appropriate magnitude, and the voltage of the energy storage module 14 can discharge through the transition module 13 when the voltage is of an appropriate magnitude, thereby achieving precise control of the charging and discharging of the servo drive and improving its energy utilization.

[0060] Optionally, see Figure 3 , Figure 3It is a circuit diagram of the first embodiment of the switch module of the present application. The switch module 131 includes a first triode S1, a second triode S2, a first diode Y1 and a second diode Y2. The collector of the first triode S1 is connected to the bus 15 to receive the voltage of the bus 15. The emitter of the first triode S1 is connected to one end of the buffer module 132. The other end of the buffer module 132 is connected to the energy storage module 14. The collector of the second triode S2 is connected to the emitter of the first triode S1, and the emitter of the second triode S2 is connected to the bus 15. The first diode Y1 and the second diode Y2 are connected in parallel to the first triode S1 and the second triode S2 in a direction respectively, so as to prevent the first triode S1 and the second triode S2 from being damaged due to excessive reverse voltage. The bases of the first triode S1 and the second triode S2 are connected to the control chip to control the conduction of the first triode S1 and the second triode S2.

[0061] When the voltage of the bus 15 needs to charge the energy storage module 14 through the transition module 13, the control chip controls the first transistor S1 to be turned on and the second transistor S2 to be turned off, so as to realize the charging of the energy storage module 14. When the energy storage module 14 is charged to its upper limit value, the control chip controls the first transistor S1 to be turned off, and the charging of the energy storage module 14 is stopped. When the voltage of the bus 15 needs to receive the discharge of the energy storage module 14, the control chip controls the first transistor S1 to be turned off and the second transistor S2 to be turned on, so as to realize the discharge of the energy storage module 14. When the energy storage module 14 is discharged to its lower limit value, the control chip controls the second transistor S2 to be turned off, and the discharge of the energy storage module 14 is stopped.

[0062] The switch module 131 in this embodiment can realize the conversion between the voltage of the bus 15 and the electric energy in the energy storage module 14 by using only two transistors and two diodes in cooperation with the control chip. It is simple in form and easy to implement, saving costs and having strong practicality. On this basis, the structure of adding other electrical components but not changing the basic function of this module is within the protection scope of this embodiment.

[0063] In some embodiments of the present application, the AC voltage received by the rectifier module 11 includes a three-phase AC voltage.

[0064] Three-phase AC voltage is composed of three alternating currents with the same frequency, equal amplitude, and phase difference of 120 degrees. It is generated by a three-phase AC generator. The single-phase AC used in daily life is actually provided by one phase of the three-phase AC. The single-phase AC power generated by a single-phase generator is rarely used.

[0065] The three-phase AC voltage is received by the rectifier module 11 and rectified into DC power. Optionally, the rectifier module 11 includes a six-bridge rectifier circuit to correspond to the three-phase AC voltage. The rectifier module 11 has three input terminals, each of which receives a phase of AC voltage, and then outputs it through the connection point of two diodes connected end to end, and is converted into DC power and output to the bus 15.

[0066] Correspondingly, the inverter module 12 includes three output terminals. The inverter module 12 inverts the DC voltage output by the rectifier module 11 into a drive signal. The drive signal can be a three-phase AC signal with adjustable frequency and adjustable voltage. The control chip is connected to the inverter module 12 to control the frequency and voltage of the output drive signal.

[0067] This application also provides a servo punch control system, see Figure 4 , Figure 4 It is a schematic diagram of the framework of the first embodiment of the servo punch control system of the present application.

[0068] The servo punch control system includes any one of the servo drivers 41, an AC power supply 42 and a motor 43 in the above-mentioned multiple embodiments. The AC power supply 42 is connected to the servo driver 41 to supply power to the servo driver 41. The AC power supply 42 can be a three-phase AC generator 43 to provide a three-phase AC voltage to the servo driver 41. The motor 43 is connected to the servo driver 41, and the servo driver 41 is used to drive the motor 43.

[0069] Optionally, the motor 43 may be a three-phase AC servo motor, the rotor of which is made of permanent magnetic material, and the servo driver 41 changes the frequency of the output drive signal through a control signal to control the running speed of the motor 43 .

[0070] The servo punch control system provided in this embodiment includes a servo driver 41, an AC power supply 42 and a motor 43. The servo driver 41 includes a rectifier module 11, an inverter module 12, a transition module 13, an energy storage module 14 and a control chip. The control chip controls the charging and discharging of the energy storage module 14 by judging the voltage of the bus 15, thereby improving the energy utilization rate of the servo driver 41 and further improving the energy utilization rate of the servo punch control system.

[0071] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the claims attached to the utility model.

Claims

1. A servo drive, characterized in that: include: A rectifier module receives an AC voltage and is used to rectify the AC voltage into a DC voltage; An inverter module, connected to the rectifier module via a bus bar, and used for inverting the DC voltage into a drive signal; A transition module, connected to the bus, and used to obtain the voltage of the bus; An energy storage module is connected to the transition module, and the transition module charges the energy storage module according to the voltage of the bus, or the energy storage module discharges through the transition module according to the voltage of the bus.

2. The servo driver according to claim 1, characterized in that: The transition module comprises: A switch module, connected to the bus, and used to convert the voltage of the bus into a first voltage; The buffer module is connected with the switch module and the energy storage module.

3. The servo driver according to claim 2, characterized in that: The buffer module includes a first inductor for buffering charging of the energy storage module and discharging of the energy storage module.

4. The servo driver according to claim 1, characterized in that: The energy storage module includes a plurality of battery cells connected in parallel and is used for storing electric energy.

5. The servo driver according to claim 1, characterized in that: The servo driver further includes a control chip, and the control chip is used to control the transition module to charge the energy storage module when it is determined that the voltage of the bus is greater than or equal to a first preset voltage.

6. The servo driver according to claim 5, characterized in that: The control chip is used to control the transition module to stop charging the energy storage module when it is determined that the voltage of the energy storage module is greater than or equal to a second preset voltage.

7. The servo driver according to claim 6, characterized in that: The control chip is used to control the energy storage module to discharge the transition module when it is determined that the voltage of the bus is less than or equal to a third preset voltage.

8. The servo driver according to claim 7, characterized in that: The control chip is used to control the energy storage module to stop discharging the transition module when it is determined that the voltage of the energy storage module is less than or equal to a fourth preset voltage.

9. The servo driver according to claim 1, characterized in that: The AC voltage received by the rectifier module includes a three-phase AC voltage, and the rectifier module receives three single-phase AC voltages through three input terminals respectively.

10. A servo punch control system, characterized in that: comprising a servo drive, an AC power supply and a motor as described in any one of claims 1 to 9, The AC power supply is connected to the servo drive and is used to supply power to the servo drive; The motor is connected to the servo driver, and the servo driver is used to drive the motor.

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