CN105515474A - DC motor speed adjustment system and speed adjustment method - Google Patents

DC motor speed adjustment system and speed adjustment method Download PDF

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Publication number
CN105515474A
CN105515474A CN201510901368.XA CN201510901368A CN105515474A CN 105515474 A CN105515474 A CN 105515474A CN 201510901368 A CN201510901368 A CN 201510901368A CN 105515474 A CN105515474 A CN 105515474A
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CN
China
Prior art keywords
pcc
speed adjustment
speed regulator
speed
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510901368.XA
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Chinese (zh)
Inventor
王芳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Dianji University
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Shanghai Dianji University
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Filing date
Publication date
Application filed by Shanghai Dianji University filed Critical Shanghai Dianji University
Priority to CN201510901368.XA priority Critical patent/CN105515474A/en
Publication of CN105515474A publication Critical patent/CN105515474A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0854Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load responsive to rate of change of current, couple or speed, e.g. anti-kickback protection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/2855Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value

Abstract

The present invention discloses a DC motor speed adjustment system and a speed adjustment method. An industrial personal computer (PC) is connected to a PCC through an RS-232 communication interface and is mainly used as a host computer. The PCC is connected to a DC speed adjustment device through an I/O port. The DC speed adjustment device is electrically connected to a DC motor. A speed measurement generation is connected between the PCC and a DC motor. The speed adjustment method comprises the steps of debugging the speed adjustment circuit formed by the DC speed adjustment device, adding the PCC into the speed adjustment circuit, collecting related data, combined with data collected by hardware debugging, carrying out software programming and debugging, and making a configuration interface according to a monitoring requirement after the debugging is completed. The DC motor speed adjustment system and the speed adjustment method have the advantages of high speed adjustment precision and a stable system, the function of a man-machine interactive interface HMI is comprised, and the operating performance is good.

Description

A kind of DC motor speed drive system and speed regulating method
Technical field
The present invention relates to a kind of DC motor speed drive system and speed regulating method.
Background technology
DC speed regulator regulates exactly dC motorthe equipment of speed, because DC motor has slow-speed of revolution high-torque, is alternating current motorcannot replace, therefore regulate direct current drive motor speed equipment---DC speed regulator has the wide application world.
The applicable situation of DC speed regulation:
Following occasion needs to use DC speed regulator:
1. need wider speed adjustable range;
2. need dynamic response process faster;
3. during acceleration, deceleration, need the transitional processes of automatic smoothing;
4. when needing low-speed running, moment is large;
5. need preferably excavatorcharacteristic, can be by overload currentvolitional check is on setting electric current.
Above 5 is also the application characteristic of DC speed regulator.
The range of application of DC speed regulation:
digit Control Machine Tool, papermaking printing, textile printing and dyeing, optical cable cable apparatus, package packing machine, technical machinery, food processing machinery, rubber manufacturing machinery, biological plant, printed circuit boardequipment, experimental facilities, welding cutting, light industry and machinery, handling and conveying equipment, rolling stock, Medical Devices, communication apparatus, radarequipment, satellite ground receiving system etc.
DC speed regulator is exactly the equipment regulating direct current drive motor speed, and upper end is connected with AC power, and lower end is connected with DC motor, direct current speed regulatorbecome by AC conversion two-way to export DC power supply, a road inputs to direct current machine and sharpens magnetic (stator), and a road inputs to direct current machinearmature (rotor), DC speed regulator regulates DC motor rotation speed by controlling armature direct current voltage.DC motor is to speed regulator feedback current simultaneously, and speed regulator judges the speed conditions of direct current machine according to feedback current, revises armature voltage if desired and exports, again regulate the rotating speed of motor with this.
The speed-regulating scheme of direct current machine generally has following 3 kinds of modes:
1, armature voltage is changed;
2, field winding voltage is changed;
3, armature circuit resistance 1 is changed.
The most frequently used is pressure and speed regulating system, namely adopts first kind of way, namely changes the mode of armature voltage.
DC motor speed drive system is the technical field belonging to automatic control system.Be used widely in automatic speed regulation system.It is also widely applied in the various manufacturing machine requiring speed adjusting performance higher and field engineering.
What the speed governing of DC motor in the market still adopted mostly is the control system that single-chip microcomputer and relay etc. form, and the speed regulator be made up of power supply, control, drive circuit.
The DC variable-speed control system be made up of single-chip microcomputer and relay also exists life-span short, the more high place perfect not of system failure rate, and especially the speed regulating control aspect of motor awaits further raising.Its shortcoming of speed regulator realized by power supply, control, drive circuit is: need the operational amplifier used in circuit, the drift caused because of line voltage and variations in temperature can produce arithmetic eror, analogue device is aging also can cause arithmetic eror, even makes the poor system performance of having adjusted.Existing technology does not comprise the function of Man Machine Interface HMI, handling poor.
The human-computer interaction interface of existing DC motor speed-regulating is not perfect and perfect.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of DC motor speed drive system and speed regulating method, adjusting speed accuracy is high, system stability, and operating characteristics is good.
The technical scheme of the technical problem to be solved in the present invention is:
A kind of DC motor speed drive system, comprise industrial computer, PCC, DC speed regulator, direct current machine, tachogenerator, described industrial computer is connected with PCC by RS-232 communication interface, described PCC is connected with DC speed regulator by I/O port, described DC speed regulator is electrically connected with direct current machine, and described tachogenerator is connected between PCC and direct current machine.
Preferably, described PCC comprises cp476cpu module and RS-232 communication module, and analog output module AO352, Analog input mModule AI354, digital output module DO435.
Preferably, described DC speed regulator is 514C.
Preferably, D01, D02 port of described PCC digital output module DO435 is connected with 5 pin (RUN) of DC speed regulator 514C, 20 pin (ENABLE) respectively, and A01, A02 of analog output module AO352 are connected with 7 pin (CurrentLimitInput) of DC speed regulator 514C, 13 pin (SetpointRampInput) respectively; The COM end of digital output module DO435 is connected with 11 pin of DC speed regulator 514C respectively with the COM end of analog output module AO352.
Preferably, the AI1 port of described PCC Analog input mModule AI354 is connected with the sliding end of the potentiometer being connected to tachogenerator two ends.
A kind of DC motor speed-regulating method of the present invention, comprises the DC motor speed drive system be made up of industrial computer, PCC, DC speed regulator, direct current machine, tachogenerator, specifically comprises following several step:
(1), first the alignment circuit be made up of DC speed regulator is debugged;
(2), debugging successfully, PCC is added in alignment circuit, and DC speed regulator can be controlled with PCC and carry out shirtsleeve operation, and gather related data;
(3), for the data collected by the controlling functions combined with hardware debugging that will realize, carry out software programming, and carry out software simulation debugging;
, finally download program to PCC, carry out the combined debugging of software and hardware;
, debugged after, make configuration interface according to the requirement that will monitor.
Excellent effect of the present invention:
Because DC motor has slow-speed of revolution high-torque, be that alternating current motor cannot replace, therefore direct current drive motor speed regulated and there is the wide application world.Meanwhile, due to programmable controller (PCC) extensive use in each field, utilize the function that it is powerful, CONTROLLER DESIGN realizes the speed governing of direct current machine, has certain engineering significance.PCC and configuration software are applied on the speed-adjusting and control system of DC motor by the present invention, can promote precision and the interactivity of speed governing.
The control thinking of PCC is Control-oriented process, and analytic operation ability is strong, can run distinct program in same CPU simultaneously.Only sweep test program when program is run, efficiency is very high, has high reliability.PCC is adopted to carry out controlling to make the precision of Direct Current Governor System and interactivity greatly improve to DC speed regulator as host computer.Programming adopts high-level language, provides good interface to follow-up amendment and exploitation.
Adjusting speed accuracy of the present invention is high, system stability, and the present invention comprises the function of Man Machine Interface HMI, and operating characteristics is good.
Accompanying drawing explanation
Accompanying drawing described herein is in order to provide a further understanding of the present invention, and form the part of the present patent application, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.
Below in conjunction with drawings and Examples, the present invention is further described.
Accompanying drawing 1 is the hardware structure diagram of the Direct Current Governor System of an embodiment of the present invention;
Accompanying drawing 2 is the Direct Current Governor System schematic diagram of an embodiment of the present invention;
Accompanying drawing 3 is the Direct Current Governor System program flow diagram of an embodiment of the present invention.
Embodiment
Below by way of particular specific embodiment, technology contents of the present invention is described, the content that those skilled in the art can be disclosed by this specification understands other advantage of the present invention and effect easily.The present invention is also implemented by other different specific embodiment or is applied, and the every details in this specification also based on different viewpoints and application, can carry out various modification and change under spirit of the present invention.
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
See Fig. 1, the Direct Current Governor System of this invention, scheme of the invention is be made up of industrial computer (particularly with the supervisory control comuter of configuration software), PCC, DC speed regulator, direct current machine and tachogenerator.Wherein PCC is as host computer, and DC speed regulator 514C is as slave computer.
System realizes industrial computer and PCC communication by RS-232, and is undertaken more intuitively observing more accurately and controlling by the process of KingView 6.0 pairs of DC speed regulation.Host computer PC C is connected with DC speed regulator by I/O port, and realize its communication and the control to direct current machine, described DC speed regulator is electrically connected with direct current machine.This system is Double Closed-loop DC Speed System, and described tachogenerator is connected between PCC and direct current machine, and wherein tachogenerator and PCC form speed ring, and DC speed regulator is electric current loop.
Introduce from the above mentioned, concrete, see Fig. 2, described PCC comprises cp476cpu module and 2003 communication modules, and analog output module AO352, Analog input mModule AI354, digital output module DO435.
Communication module specifically comprises several as follows: 7IF311.7,2003 series interfaces modules, 1 RS-232 interface, screw-in module 76; 7IF321.7,2003 series interfaces modules, 1 RS485/RS422 interface, electric isolution, network-connectable, screw-in module 77; 7IF361.70-1,2003 series interfaces modules, 1 RS485 interface, electric isolution, network-connectable, host-host protocol: PROFIBUSDP, screw-in module.
Preferably, described DC speed regulator is 514C.Continental Europe 514C dC speed regulatorbe Continental Europe driver device company of Britain produce one with operational amplifieras the analog DC reversible speed control system of regulating element.As a kind of expansion equipment be used in industrial environment, 514C have employed a kind of open frame structure, and whole expander take radiator as pedestal, and two groups antiparallel thyristor moduledirectly fix on a heat sink; Other one piece of driving power printed circuit board (PCB), one piece of control circuit printed circuit board (PCB) and one piece of panel are contained in above radiator with stacked structure, and whole device does not need special tool(s) just can dismantle easily.Controller overall dimensions is 160mm × 240mm × 130mm (wide × high × thick).
514C type speed regulatorbe the aspergillus ficuum DC reversible speed control system of a logic control, its control loop is a rotating speed---electric current is two closed-loop system, outer shroud is der Geschwindigkeitkreis, can adopt velocity feedback or armaturevoltage Feedback, user can decide the mode of feedback by operating function selector switch SW1/3.When employing armature negative voltage feedbacktime, can use potentiometerp8 adds electric current positive feedbackcarry out velocity compensation, if employing is speed negative feedback, then should remove current compensation, namely potentiometer P8 be forwarded to the end counterclockwise.The voltage range of velocity feedback is set by the combination of functional select switch SW1/1, SW2/1, and is corrected rotating speed by potentiometer P10.
Preferably, D01, D02 port of described PCC digital output module DO435 is connected with 5 pin (RUN) of DC speed regulator 514C, 20 pin (ENABLE) respectively, digital output module 7DO435.7,2003 series digit amount output modules, 8 road FET export, 24VDC, 2A.Export and also can be set to input.
A01, A02 of analog output module AO352 are connected with 7 pin (CurrentLimitInput) of DC speed regulator 514C, 13 pin (SetpointRampInput) respectively; Analog output module 7AO352.70,2003 series analog amount output modules, 2 tunnels export, ± 10V or 0-20mA, 12Bit.
The COM end of digital output module DO435 is connected with 11 pin of DC speed regulator 514C respectively with the COM end of analog output module AO352.
Preferably, the AI1 port of described PCC Analog input mModule AI354 is connected with the sliding end of the potentiometer being connected to tachogenerator two ends.Analog input mModule 7AI354.70,2003 series analog amount input modules, 4 tunnel inputs ,+/ 10V, 12Bit+ sign bit.
A kind of DC motor speed-regulating method of the present invention, comprises the DC motor speed drive system be made up of industrial computer, PCC, DC speed regulator, direct current machine, tachogenerator, specifically comprises following several step:
(1), first the alignment circuit be made up of DC speed regulator is debugged;
(2), debugging successfully, PCC is added in alignment circuit, and DC speed regulator can be controlled with PCC and carry out shirtsleeve operation, and gather related data;
(3), for the data collected by the controlling functions combined with hardware debugging that will realize, carry out software programming, and carry out software simulation debugging;
, finally download program to PCC, carry out the combined debugging of software and hardware;
, debugged after, make configuration interface according to the requirement that will monitor.
Soft and hardware uniting and adjustment of the present invention are by the monitoring of software to PCC, test this Direct Current Governor System to electric motor starting, stop, turning to and whether the control of rotating speed can realize.By debugging, having found two problems, is that rotating speed is converted into the problem of decimal numeral conversion coefficient and the problem of shut down procedure block respectively.
(1) amendment of rotating speed conversion coefficient
Conversion between tachometer value and decimal value was change with formula originally, and in debug process, mistake appears in program, and transforming numerical repeatedly changes between-1200 ~ 1200.The coefficient that rear employing is fixed transforms, and coefficient is about 10.67.But because analog input module is INT type controlling the variable-definition of this module, and conversion coefficient is REAL type, and REAL type is higher than the class change of INT type.Therefore INT type can not be converted to REAL type, also cannot be multiplied by the variable of a REAL type, causes occurring mistake during program compilation.So finally get the approximate shaping 11 of this conversion coefficient here as the conversion coefficient in program.
(2) amendment of shut down procedure
Original program just closes DC speed regulator after set point and given intermediate variable are set to 0, and now motor speed is not 0, and motor may be caused like this to produce larger surge current.So now this program is divided into two pieces, one piece is that speed setting value and given intermediate variable are set to 0, and another block reduces to the program of closing DC speed regulator 514C after 0 when clicking set-point.Just close DC speed regulator after so just can guaranteeing to click parking, play the effect of protection motor.
See Fig. 3, it is the Direct Current Governor System program flow diagram of an embodiment of the present invention.Comprise and prepare to start, start, start 514c and carry out current limit, arrange and turn to rotating speed, closed loop speed stabilizing, signal to judge, close 514c and stop the link such as current limit.
Although this patent is explained with reference to preferred embodiment and accompanying drawing, but above-mentioned explanation should be considered as illustrative and non-limiting, and the change that person's spirit according to the present invention of being familiar with technique is made and amendment, all should belong to the protection range of this patent.

Claims (6)

1. a DC motor speed drive system, is characterized in that:
Comprise industrial computer, PCC, DC speed regulator, direct current machine, tachogenerator, described industrial computer is connected with PCC by RS-232 communication interface, described PCC is connected with DC speed regulator by I/O port, described DC speed regulator is electrically connected with direct current machine, and described tachogenerator is connected between PCC and direct current machine.
2. a kind of DC motor speed drive system according to claim 1, is characterized in that:
Described PCC comprises cp476 module and RS-232 communication module, and analog output module AO352, Analog input mModule AI354, digital output module DO435.
3. a kind of DC motor speed drive system according to claim 1, is characterized in that:
Described DC speed regulator is 514C.
4. a kind of DC motor speed drive system according to claim 2, is characterized in that:
D01, D02 port of described PCC digital output module DO435 is connected with 5 pin (RUN) of DC speed regulator 514C, 20 pin (ENABLE) respectively,
A01, A02 of analog output module AO352 are connected with 7 pin (CurrentLimitInput) of DC speed regulator 514C, 13 pin (SetpointRampInput) respectively;
The COM end of digital output module DO435 is connected with 11 pin of DC speed regulator 514C respectively with the COM end of analog output module AO352.
5. a kind of DC motor speed drive system according to claim 2, is characterized in that:
The AI1 port of described PCC Analog input mModule AI354 is connected with the sliding end of the potentiometer being connected to tachogenerator two ends.
6. a DC motor speed-regulating method, is characterized in that:
Comprise the DC motor speed drive system be made up of industrial computer, PCC, DC speed regulator, direct current machine, tachogenerator, specifically comprise following several step:
(1), first the alignment circuit be made up of DC speed regulator is debugged;
(2), debugging successfully, PCC is added in alignment circuit, and DC speed regulator can be controlled with PCC and carry out shirtsleeve operation, and gather related data;
(3), for the data collected by the controlling functions combined with hardware debugging that will realize, carry out software programming, and carry out software simulation debugging;
, finally download program to PCC, carry out the combined debugging of software and hardware;
, debugged after, make configuration interface according to the requirement that will monitor.
CN201510901368.XA 2015-12-08 2015-12-08 DC motor speed adjustment system and speed adjustment method Pending CN105515474A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107508510A (en) * 2017-08-22 2017-12-22 姚静洁 A kind of DC reversibling speed-regulating device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0442344A2 (en) * 1990-02-16 1991-08-21 Siemens Aktiengesellschaft Overload-supervisory equipment for an electric load-carrying device
CN101853591A (en) * 2010-05-12 2010-10-06 上海电机学院 Integrated control system experiment device and operation method
CN201985810U (en) * 2011-02-23 2011-09-21 戴树梅 PCC type excitation regulator
CN103078575A (en) * 2013-02-20 2013-05-01 湖南大学 Integrated multifunctional controller for low-power direct-current servomotors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0442344A2 (en) * 1990-02-16 1991-08-21 Siemens Aktiengesellschaft Overload-supervisory equipment for an electric load-carrying device
CN101853591A (en) * 2010-05-12 2010-10-06 上海电机学院 Integrated control system experiment device and operation method
CN201985810U (en) * 2011-02-23 2011-09-21 戴树梅 PCC type excitation regulator
CN103078575A (en) * 2013-02-20 2013-05-01 湖南大学 Integrated multifunctional controller for low-power direct-current servomotors

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
郭建业: "《高油压水轮机调速器技术及应用》", 30 April 2007, 长江出版社 *
齐蓉: "《高等学校教材 可编程计算机控制器技术》", 30 November 2005, 电子工业出版社 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107508510A (en) * 2017-08-22 2017-12-22 姚静洁 A kind of DC reversibling speed-regulating device

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Application publication date: 20160420