CN203376604U - Full closed-loop numerical control system feedback circuit realized by AC servo drive - Google Patents
Full closed-loop numerical control system feedback circuit realized by AC servo drive Download PDFInfo
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- CN203376604U CN203376604U CN201320331345.6U CN201320331345U CN203376604U CN 203376604 U CN203376604 U CN 203376604U CN 201320331345 U CN201320331345 U CN 201320331345U CN 203376604 U CN203376604 U CN 203376604U
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- servo motor
- grating scale
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Abstract
The utility model provides a full closed-loop numerical control system feedback circuit realized by an AC servo drive, relates to the technical field of a grating scale feedback circuit of a full closed-loop numerical control system, and solves problems that a conventional full closed-loop numerical control system is complex in algorithm, high in development cost and poor in expansibility. The circuit comprises an open-loop numerical control system, an AC servo driver, an AC servo motor, a mechanical transmission component and a grating scale. The open-loop numerical control system is electrically connected with the AC servo driver and the AC servo motor in turn. The AC servo motor is connected with the mechanical transmission component. The grating scale is arranged on the mechanical transmission component. The output end of the grating scale is connected with the AC servo driver. The circuit is simple in structure and stable and reliable. Besides, two-channel orthogonal pulse four times frequency reversible counting can be realized and cost is greatly saved.
Description
Technical field
The utility model relates to the grating scale feedback circuit technical field of closed-loop digital control system, especially relates to a kind of AC servo driving and realizes closed-loop digital control system feedback circuit.
Background technology
The world today, industrially developed country pays much attention to industrial automation, competitively develop electromechanical integration, high-precision, efficient, high automation sophisticated equipment, particularly, along with the high speed development of microelectronics, computer technology, power technology, sensing technology, Numeric Control Technology, robotization becomes the focus that various countries manufacturer competitively shows advanced technology, contention user, enlarges market after being controlled at the eighties in 20th century.
In the CNC control application field of high speed and super precision, most closed-loop digital control systems that adopt make up the driving error of machine tool mechanical part as motor, leading screw, reductor etc., thereby guarantee machine finish, realize the requirement of high speed and super precision at present.Closed-loop digital control system commonly used as shown in Figure 1, is that the signal that feedback element (for example: be arranged on the grating scale on the machine tool guideway axle) is fed back directly turns back to digital control system, by the digital control system and instruction, relatively carries out closed loop algorithm.There is following problem in this scheme:
1, algorithm complexity, particularly when controlling multiaxis, the number of axle more rate request, the request memory of multiple numerical control systems is also higher, and algorithm is also more complicated;
2, cost of development and cost of products are all higher;
3, in multi-axis numerical control system, extendability is poor.
Summary of the invention
The purpose of this utility model is: the problem existed for prior art, provide a kind of simple in structure, reliable and stable, and can realize two passage orthogonal pulses, 4 frequency multiplication reversible countings, and also the AC servo greatly provided cost savings driving realizes closed-loop digital control system feedback circuit.
The purpose of this utility model is achieved through the following technical solutions:
A kind of AC servo drives and realizes closed-loop digital control system feedback circuit, it is characterized in that, this circuit comprises open-loop NC system, AC servo driver, AC servo motor, mechanical transmission component and grating scale, described open-loop NC system is electrically connected to AC servo driver, AC servo motor successively, described AC servo motor is connected with mechanical transmission component, described grating scale is arranged on mechanical transmission component, and the output terminal of grating scale is connected to AC servo driver.
Preferably, described AC servo driver comprises digital signal controller, be provided with interface chip and two balance filtering circuits between the output terminal of described grating scale and AC servo driver, an orthogonal pulses signal output part of grating scale is connected to interface chip by a balance filtering circuit, another orthogonal pulses signal output part of grating scale is connected to interface chip by another balance filtering circuit, and the output terminal of described interface chip is connected to digital signal controller.
Preferably, on described AC servo motor, be provided with encoder for servo motor, this encoder for servo motor is connected with digital signal controller.
Preferably, be provided with interface chip and two balance filtering circuits between described encoder for servo motor and digital signal controller, an orthogonal pulses signal output part of encoder for servo motor is connected to interface chip by a balance filtering circuit, another orthogonal pulses signal output part of encoder for servo motor is connected to interface chip by another balance filtering circuit, and the output terminal of described interface chip is connected to digital signal controller.
Preferably, the balance filter circuit construction arranged between the balance filtering circuit arranged between the output terminal of grating scale and AC servo driver and encoder for servo motor and digital signal controller is identical, include resistance, two substitutional resistances and an electric capacity, the anode of orthogonal pulses signal and negative terminal respectively are connected to two input ends of interface chip by an equivalent electric capacity, described resistance is connected across between anode and negative terminal, and described electric capacity is connected across between two input ends of interface chip.
Preferably, the interface chip arranged between the interface chip arranged between the output terminal of grating scale and AC servo driver and encoder for servo motor and digital signal controller is the interface chip of AM26LS32 model.
Preferably, the dsp chip that described digital signal controller is the TMS320F2806 model.
Compared with prior art, the utlity model has following advantage:
1, adopt the low-power consumption DSP programmable chip U2(TMS320F2806 of stable performance) simple in structure, reliable and stable, and can realize two passage orthogonal pulses, 4 frequency multiplication reversible countings.
2, realize the feedback closed loop algorithm of grating scale by AC servo driver, simple in structure, greatly provide cost savings, reliable and practical.
3, favorable expandability, when for multiple axes system, only need the corresponding feedback loop that increases to get final product, and do not need digital control system is changed.
The accompanying drawing explanation
Fig. 1 is traditional closed-loop digital control system grating scale feedback circuit schematic diagram;
Fig. 2 is the utility model open-loop NC system grating scale feedback circuit schematic diagram;
Fig. 3 is that AC servo driver realizes closed-loop digital control system feedback circuit figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
embodiment
As shown in Figure 2 and Figure 3, the utility model is controlled AC servo driver by ripe open-loop NC system, the feedback signal of grating scale is directly fed back to AC servo driver, because AC servo driver has a set of independently closed loop algorithm (feedback circuit of encoder for servo motor) that improves, so drive on device and add again a set of grating scale closed loop algorithm in AC servo, can be protected to greatest extent aspect development time, development cost and product maturation, and easily realize.Principle of work of the present utility model is: two an EQEP quadrature input circuit passages dsp chip U2(TMS320F2806 of AC servo driver) are realized 4 frequency multiplication reversible countings of encoder for servo motor and lathe grating scale.
Circuit of the present utility model comprises open-loop NC system, AC servo driver, AC servo motor, mechanical transmission component and grating scale.Open-loop NC system is electrically connected to AC servo driver, AC servo motor successively, and system sends instruction to AC servo driver, and controls the rotating speed of AC servo motor by AC servo driver.AC servo motor is connected with mechanical transmission component, the motion of driving mechanical legacy device.Grating scale is arranged on mechanical transmission component, and the output terminal of grating scale is connected to AC servo driver, for the ruuning situation of collection machinery drive disk assembly, and information is fed back to AC servo driver.What the utility model adopted is ripe open-loop NC system and the ripe AC servo driver of stable performance.When controlling for multiaxis, only need to increase corresponding AC servo driver, AC servo motor, mechanical transmission component and grating scale and get final product, and needn't be changed digital control system.
The critical piece of AC servo driver is digital signal controller, can adopt DSP programmable chip (TMS320F2806).Be provided with interface chip and two balance filtering circuits of AM26LS32 model between the output terminal of grating scale and AC servo driver.An orthogonal pulses signal output part of grating scale (anode EPA+, negative terminal EPA-) is connected to interface chip U3 by a balance filtering circuit (being comprised of resistance R 7, R8, R9 and capacitor C 3), forms the EQEP2A signal; Another orthogonal pulses signal output part of grating scale (anode EPB+, negative terminal EPB-) is connected to interface chip U3 by another balance filtering circuit (being comprised of resistance R 10, R11, R12 and capacitor C 4), the output terminal of this interface chip is connected to digital signal controller U2, becomes the EQEP2B signal.Orthogonal pulses signal EQEP2A, EQEP2B signal are input to dsp chip U2(TMS320F2806) quadrature network, by DSP quadrature network 4 frequency multiplication up-down counter countings, dsp chip U2(TMS320F2806) counting of grating scale signal compared with the input instruction, realize the closed-loop algorithm.Thereby AC servo drives and has realized the direct closed loop algorithm to the grating scale feedback signal.
Be provided with encoder for servo motor on AC servo motor, this encoder for servo motor is connected with digital signal controller.Be provided with interface chip and two balance filtering circuits of AM26LS32 model between encoder for servo motor and digital signal controller.An orthogonal pulses signal output part of encoder for servo motor (anode EA+, negative terminal EA-) is connected to interface chip U1 by a balance filtering circuit (being comprised of resistance R 1, R2, R3 and capacitor C 1), forms the EQEP1A signal; Another orthogonal pulses signal output part of encoder for servo motor (anode EB+, negative terminal EB-) is connected to interface chip U1 by another balance filtering circuit (being comprised of resistance R 4, R5, R6 and capacitor C 2), forms the EQEP1B signal.The output terminal of interface chip is connected to digital signal controller.Orthogonal pulses signal EQEP1A, EQEP1B signal are input to dsp chip U2(TMS320F2806) quadrature network, by DSP quadrature network 4 frequency multiplication up-down counter countings, thereby realized that AC servo drives the counting to the motor encoder input signal, completed speed control and positional control algorithm that AC servo drives.
The balance filter circuit construction arranged between the balance filtering circuit arranged between the output terminal of grating scale and AC servo driver and encoder for servo motor and digital signal controller is identical, include resistance, two substitutional resistances and an electric capacity, the anode of orthogonal pulses signal and negative terminal respectively are connected to two input ends of interface chip by an equivalent electric capacity, resistance is connected across between anode and negative terminal, and electric capacity is connected across between two input ends of interface chip.Example: an orthogonal pulses signal output part of encoder for servo motor: anode EA+, negative terminal EA-.Anode EA+ is connected to the 1A input end of interface chip U1 by equivalent capacitance R2, negative terminal EA-is connected to the 1B input end of interface chip U1 by equivalent capacitance R3, resistance R 1 is connected across between anode EA+ and negative terminal EA-, and capacitor C 1 is connected across between two the input end 1A and 1B of interface chip U1.Wherein the resistance of resistance R 1 is selected 1K Europe mother, and the resistance value of substitutional resistance R2 and R3 is elected 300 Europe mothers as, and the capacitance of capacitor C 1 is elected 330pF as.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; it should be pointed out that all any modifications of doing within spirit of the present utility model and principle, be equal to replacement and improvement etc., within all should being included in protection domain of the present utility model.
Claims (7)
1. an AC servo drives and realizes closed-loop digital control system feedback circuit, it is characterized in that, this circuit comprises open-loop NC system, AC servo driver, AC servo motor, mechanical transmission component and grating scale, described open-loop NC system is electrically connected to AC servo driver, AC servo motor successively, described AC servo motor is connected with mechanical transmission component, described grating scale is arranged on mechanical transmission component, and the output terminal of grating scale is connected to AC servo driver.
2. a kind of AC servo according to claim 1 drives and realizes closed-loop digital control system feedback circuit, it is characterized in that, described AC servo driver comprises digital signal controller, be provided with interface chip and two balance filtering circuits between the output terminal of described grating scale and AC servo driver, an orthogonal pulses signal output part of grating scale is connected to interface chip by a balance filtering circuit, another orthogonal pulses signal output part of grating scale is connected to interface chip by another balance filtering circuit, the output terminal of described interface chip is connected to digital signal controller.
3. a kind of AC servo according to claim 2 drives and realizes closed-loop digital control system feedback circuit, it is characterized in that, be provided with encoder for servo motor on described AC servo motor, this encoder for servo motor is connected with digital signal controller.
4. a kind of AC servo according to claim 3 drives and realizes closed-loop digital control system feedback circuit, it is characterized in that, be provided with interface chip and two balance filtering circuits between described encoder for servo motor and digital signal controller, an orthogonal pulses signal output part of encoder for servo motor is connected to interface chip by a balance filtering circuit, another orthogonal pulses signal output part of encoder for servo motor is connected to interface chip by another balance filtering circuit, and the output terminal of described interface chip is connected to digital signal controller.
5. a kind of AC servo according to claim 4 drives and realizes closed-loop digital control system feedback circuit, it is characterized in that, the balance filter circuit construction arranged between the balance filtering circuit arranged between the output terminal of grating scale and AC servo driver and encoder for servo motor and digital signal controller is identical, include resistance, two substitutional resistances and an electric capacity, the anode of orthogonal pulses signal and negative terminal respectively are connected to two input ends of interface chip by an equivalent electric capacity, described resistance is connected across between anode and negative terminal, described electric capacity is connected across between two input ends of interface chip.
6. a kind of AC servo according to claim 4 drives and realizes closed-loop digital control system feedback circuit, it is characterized in that, the interface chip arranged between the interface chip arranged between the output terminal of grating scale and AC servo driver and encoder for servo motor and digital signal controller is the interface chip of AM26LS32 model.
7. a kind of AC servo according to claim 2 drives and realizes closed-loop digital control system feedback circuit, it is characterized in that the dsp chip that described digital signal controller is the TMS320F2806 model.
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| CN201320331345.6U CN203376604U (en) | 2013-06-08 | 2013-06-08 | Full closed-loop numerical control system feedback circuit realized by AC servo drive |
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| CN201320331345.6U CN203376604U (en) | 2013-06-08 | 2013-06-08 | Full closed-loop numerical control system feedback circuit realized by AC servo drive |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107992109A (en) * | 2017-12-06 | 2018-05-04 | 深圳易能电气技术股份有限公司 | Closed-loop positioning control system and method |
| CN108762318A (en) * | 2018-08-16 | 2018-11-06 | 合肥中科离子医学技术装备有限公司 | A kind of Multi-axis high-precision closed loop feedback kinetic control system |
| CN110286613A (en) * | 2019-05-13 | 2019-09-27 | 大族激光科技产业集团股份有限公司 | A kind of two-axis laser control system |
| CN110834145A (en) * | 2019-11-29 | 2020-02-25 | 苏州迅镭激光科技有限公司 | Control system for realizing full closed-loop focusing of high-power laser cutting head |
| CN110834145B (en) * | 2019-11-29 | 2024-04-26 | 苏州迅镭激光科技有限公司 | Control system for realizing full-closed-loop focusing of high-power laser cutting head |
-
2013
- 2013-06-08 CN CN201320331345.6U patent/CN203376604U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107992109A (en) * | 2017-12-06 | 2018-05-04 | 深圳易能电气技术股份有限公司 | Closed-loop positioning control system and method |
| CN108762318A (en) * | 2018-08-16 | 2018-11-06 | 合肥中科离子医学技术装备有限公司 | A kind of Multi-axis high-precision closed loop feedback kinetic control system |
| CN110286613A (en) * | 2019-05-13 | 2019-09-27 | 大族激光科技产业集团股份有限公司 | A kind of two-axis laser control system |
| CN110834145A (en) * | 2019-11-29 | 2020-02-25 | 苏州迅镭激光科技有限公司 | Control system for realizing full closed-loop focusing of high-power laser cutting head |
| CN110834145B (en) * | 2019-11-29 | 2024-04-26 | 苏州迅镭激光科技有限公司 | Control system for realizing full-closed-loop focusing of high-power laser cutting head |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140101 Termination date: 20170608 |