CN202143028U - Frequency conversion speed regulating control device of three-phase alternating current asynchronous motor - Google Patents
Frequency conversion speed regulating control device of three-phase alternating current asynchronous motor Download PDFInfo
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- CN202143028U CN202143028U CN201120264495U CN201120264495U CN202143028U CN 202143028 U CN202143028 U CN 202143028U CN 201120264495 U CN201120264495 U CN 201120264495U CN 201120264495 U CN201120264495 U CN 201120264495U CN 202143028 U CN202143028 U CN 202143028U
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- asynchronous motor
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Abstract
The utility model belongs to the technical field of motor regulating and controlling, in particular to a frequency conversion speed regulating control device of a three-phase alternating current asynchronous motor. The structure of the device is that an alternating current power supply, a rectifier, a filter device, an inverter and the three-phase alternating current asynchronous motor are sequentially connected. The output end of the rectifier is divided into a branch which is sequentially connected with a detection circuit, an arithmetic circuit and a driving circuit and then is connected with the inverter, wherein the detection circuit, the arithmetic circuit and the driving circuit are arranged on a main control board. The main control board is further connected with a liquid crystal display (LCD), a digital keyboard and a power supply respectively. Through a method of space vector control, the asynchronous motor is equivalent to a direct current motor, and input alternating voltage is rectified and filtered to obtain good direct current voltage. Control of frequency phase and amplitude on the direct current voltage is conducted by using a direct torque method, and by sampling the phase, the amplitude and frequency of output voltage, using loop control and adjusting proportion integration differentiation (PID) parameters, rotary speed of the motor can be controlled accurately.
Description
Technical field
The utility model relates to and belongs to motor control technique field, particularly a kind of ac three-phase asynchronous motor frequency control control device.
Background technology
Along with three phase mains with simple in structure and robustly exchange being widely used of cage modle motor; Be accompanied by easily manufactured, cheap, capacity limit is little, easy to maintenance, to environmental requirement advantages of higher not, AC induction motor has replaced direct current machine gradually in a lot of fields.But to the demanding field of Electric Machine Control, AC induction motor but can't reach the standard of direct current machine.Along with the development of modern AC electric machine speed regulation control theory and power electronics commutation technique, various types of speed regualtion of AC motor system has appearred in the progress of making a breakthrough property of speed regualtion of AC motor technology.Wherein the most active, with fastest developing speed is variable-frequency control technique, in national economy and daily life, occupies more and more important position.
In the evolution of control strategy; The not high control method of this systematic function of open loop constant voltage and frequency ratio in past develops into the space vector control mode; Can be a DC motor through the motor model equivalence that coordinate transform is rebuild, the direct torque control method receives and pays close attention to widely and study in the method for spatial alternation.Calculate magnetic linkage and torque by its simple mode and instantaneous space vector theory that detects motor stator voltage and electric current, and compare the gained difference, realize the direct control of magnetic linkage and torque according to calculated value and set-point.This method and thought is novel, simple in structure, and control device is direct, and the physical concept of signal processing is very clear and definite.
Along with the development of digital signal processor (DSP), arithmetic speed significantly promotes, thereby on hardware, for the realization of frequency control powerful hardware platform is provided.The most domestic product adopts single-chip microcomputer as control device, and its control performance is weaker than DSP.Therefore, in the VFC field, dsp chip must have comparatively wide development space.
Summary of the invention
The utility model provides a kind of ac three-phase asynchronous motor frequency changing regulating speed control apparatus to the problem of the relevant adjusting device of AC induction motor shortage.
The technical scheme that the utility model adopts is:
AC power, rectifier, filter, inverter and ac three-phase asynchronous motor connect successively; The output of rectifier divides out branch, is connected with testing circuit, computing circuit, the drive circuit of master control borad successively, takes back inverter then; Master control borad also is connected with LCD display, numeric keypad, power supply respectively.
Said master control borad is provided with protective circuit.
Control input panel and control output wiring board are set on the said master control borad, and its interface is divided into two kinds of RS232 serial ports and USB interfaces.
In the inverter circuit of said inverter, high-voltage large current full-control type power device adopts the IGBT element.
The computing circuit of said master control borad adopts the digital signal processor DSP chip.
The beneficial effect of the utility model is:
(1) rectification inverter circuit and man-machine interaction circuit are integrated in the casing; Only need add AC power frequency supply just can use; Speed regulating control is simple to operate distinct; Motor speed is presented at LCD and goes up and conveniently to observe and to detect, and the transfer of data that telecommunication circuit can be concerned about the user is fit to the aspect large-scale promotion such as control and Electric Machine Control teaching platform of small-sized alternating current machine on other chip or computer.
(2) control algolithm of this device adopts the Direct Torque method, and simple in structure, dynamic response is good; The employing space vector is analyzed, and adopts stator flux orientation, regulates producing pwm signal by means of discrete two point form; Directly switching states is controlled; The electric voltage frequency excursion is big, and change procedure is level and smooth, and the result is good in control.
(3) circuit part of the inverter of this device adopts IGBT as high-voltage large current full-control type power device, and is big with respect to GTO shutoff energy consumption, the big shortcoming of GTR speed governing frequency low noise, and the IGBT element has tangible advantage.
(4) this device possesses that overvoltage is reported to the police and the overcurrent warning function, when magnitude of voltage that obtains when sampling or current value exceed allowed band, gives the alarm, and reminds the user to carry out emergency treatment, has ensured the safe operation of equipment.
Description of drawings
Fig. 1 is the structure principle chart of the utility model;
Fig. 2 is the annexation figure of the utility model;
Fig. 3 is the schematic diagram of the utility model inverter circuit;
Fig. 4 is the vector control system figure of the utility model motor rotor field orientation.
Among the figure: the given rotary speed instruction 8 of user, according to the d shaft current of given rotary speed instruction output
And q shaft current
Given d shaft voltage
Q shaft voltage
Stator two-phase alternating current through rotation is inversely transformed under the two phase rest frames is pressed
And
According to stator biphase current i under the electric current rest frame that conversion obtains through Clark of actual measurement
αAnd i
β12, stator biphase current i under the rotating coordinate system that conversion obtains through Park
dAnd i
q13, survey the angular velocity omega 14 of motor.
Embodiment
The utility model provides a kind of ac three-phase asynchronous motor frequency changing regulating speed control apparatus, below in conjunction with accompanying drawing and embodiment the utility model is further specified.
As depicted in figs. 1 and 2, this device is divided into commutation inversion part and man-machine interaction part, and concrete structure is: AC power, rectifier, filter, inverter and ac three-phase asynchronous motor connect successively; The output of rectifier divides out branch, is connected with testing circuit, computing circuit, the drive circuit of master control borad successively, takes back inverter then; Master control borad also is connected with LCD display, numeric keypad, power supply respectively.On master control borad, be provided with protective circuit, and control input panel and control output wiring board are set on the master control borad, its interface is divided into two kinds of RS232 serial ports and USB interfaces.The computing circuit of master control borad adopts the digital signal processor DSP chip.
In the inverter circuit of said inverter, high-voltage large current full-control type power device adopts the IGBT element.
Acting as of commutation inversion part: the input interface of the three-phase alternating current power frequency supply being received this device; The current rectifying and wave filtering circuit that utilizes thyristor to build obtains direct current; Through inverter circuit and DSP control chip,, obtain the variable interchange output of frequency amplitude by conducting and the shutoff of Direct Torque policy control IGBT; And the amplitude of electric current and voltage is carried out real-time A/D sampling, when surpassing allowed band, can send alarm signal.
Acting as of man-machine interaction part: realize artificial control to motor speed; And on LCD, observe the current motor tachometer value; Can carry out the transfer of data between this device and other chip or the computer through control input panel and control output wiring board, make things convenient for the user to obtain related data.
The principle of inverter circuit is as shown in Figure 3, and the power-frequency voltage input obtains good direct current through current rectifying and wave filtering circuit, in inverter circuit, obtains the controlled interchange output of frequency amplitude through the control to six IGBT element conductive orders.Because the starting current of alternating current machine is bigger, is several times as much as rated current usually, therefore in order to prevent the damage of motor or circuit, in rectification inverter circuit, seal in resistance reducing current amplitude, after motor speed is stable again with the protective resistance short circuit.Electric capacity in the rectification circuit is used for the filtering odd harmonic, obtains good direct voltage.
Fig. 4 is the vector control system figure of the utility model motor rotor field orientation.Based on rotating speed---the current double closed-loop vector control system of SVPWM strategy, respectively as rotating speed RACS and Current Control subsystem.The rotating speed RACS is by the given rotary speed instruction ω of user
*The speed feedback signal ω that records with the photoelectric encoder that comes from the machine shaft compares.Output
As the command value of current regulator, it with current sensor senses to the i that obtains through 3/2 conversion of coordinate system of threephase stator electric current
αAnd i
βThe estimated value i of the stator current torque component under the rotating coordinate system that obtains after the rotation transformation
qCompare, pass through current regulator again, obtain the stator voltage component under the rotating coordinate system
Equally, the d shaft current is carried out similar calculating
By
With
Stator two-phase alternating current through rotation is inversely transformed under the two phase rest frames is pressed
With
Produce pwm pulse through the SVPWM controller, drives inverter, the pulse train that obtains alternation is exported to motor.
Claims (5)
1. ac three-phase asynchronous motor frequency changing regulating speed control apparatus, it is characterized in that: the structure of this device is:
AC power, rectifier, filter, inverter and ac three-phase asynchronous motor connect successively; The output of rectifier divides out branch, is connected with testing circuit, computing circuit, the drive circuit of master control borad successively, takes back inverter then;
Master control borad also is connected with LCD display, numeric keypad, power supply respectively.
2. ac three-phase asynchronous motor frequency changing regulating speed control apparatus according to claim 1 is characterized in that: said master control borad is provided with protective circuit.
3. ac three-phase asynchronous motor frequency changing regulating speed control apparatus according to claim 1 is characterized in that: control input panel and control output wiring board are set on the said master control borad, and its interface is divided into two kinds of RS232 serial ports and USB interfaces.
4. ac three-phase asynchronous motor frequency changing regulating speed control apparatus according to claim 1 is characterized in that: in the inverter circuit of said inverter, high-voltage large current full-control type power device adopts the IGBT element.
5. ac three-phase asynchronous motor frequency changing regulating speed control apparatus according to claim 1 is characterized in that: the computing circuit of said master control borad adopts the digital signal processor DSP chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120264495U CN202143028U (en) | 2011-07-25 | 2011-07-25 | Frequency conversion speed regulating control device of three-phase alternating current asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120264495U CN202143028U (en) | 2011-07-25 | 2011-07-25 | Frequency conversion speed regulating control device of three-phase alternating current asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202143028U true CN202143028U (en) | 2012-02-08 |
Family
ID=45554063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120264495U Expired - Fee Related CN202143028U (en) | 2011-07-25 | 2011-07-25 | Frequency conversion speed regulating control device of three-phase alternating current asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202143028U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501154A (en) * | 2013-10-21 | 2014-01-08 | 佛山市美传科技有限公司 | Low-speed control device for three-phase alternating-current asynchronous motor |
| CN104973522A (en) * | 2015-05-20 | 2015-10-14 | 鲁霄钢 | Boom crane |
| CN108832860A (en) * | 2018-07-27 | 2018-11-16 | 江苏省特种设备安全监督检验研究院 | Portable electronic magnetic linkage torque tester |
| CN109888982A (en) * | 2019-03-18 | 2019-06-14 | 中国重汽集团大同齿轮有限公司 | Slide variable speed electric motors, particularly |
-
2011
- 2011-07-25 CN CN201120264495U patent/CN202143028U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501154B (en) * | 2013-10-21 | 2016-04-06 | 佛山市美传科技有限公司 | The low speed control of three-phase AC asynchronous motor |
| CN103501154A (en) * | 2013-10-21 | 2014-01-08 | 佛山市美传科技有限公司 | Low-speed control device for three-phase alternating-current asynchronous motor |
| CN106402203A (en) * | 2015-05-20 | 2017-02-15 | 鲁霄钢 | Jib hoist provided with novel brake |
| CN104973522B (en) * | 2015-05-20 | 2016-11-23 | 鲁霄钢 | Jib crane |
| CN106276654A (en) * | 2015-05-20 | 2017-01-04 | 鲁霄钢 | A kind of jib crane optimizing reel mounting structure |
| CN106395648A (en) * | 2015-05-20 | 2017-02-15 | 鲁霄钢 | Jig hoist provided with optimized coiling block connecting structure |
| CN104973522A (en) * | 2015-05-20 | 2015-10-14 | 鲁霄钢 | Boom crane |
| CN106429924A (en) * | 2015-05-20 | 2017-02-22 | 鲁霄钢 | Arm type crane for optimizing lifting limiter |
| CN106429923A (en) * | 2015-05-20 | 2017-02-22 | 鲁霄钢 | Novel arm type crane |
| CN106629440A (en) * | 2015-05-20 | 2017-05-10 | 鲁霄钢 | Boom crane provided with rope pressing structures |
| CN106629440B (en) * | 2015-05-20 | 2019-04-09 | 鲁霄钢 | A kind of jib crane of configuration pressure rope structure |
| CN108832860A (en) * | 2018-07-27 | 2018-11-16 | 江苏省特种设备安全监督检验研究院 | Portable electronic magnetic linkage torque tester |
| CN108832860B (en) * | 2018-07-27 | 2023-05-19 | 江苏省特种设备安全监督检验研究院 | Portable electronic flux linkage torque tester |
| CN109888982A (en) * | 2019-03-18 | 2019-06-14 | 中国重汽集团大同齿轮有限公司 | Slide variable speed electric motors, particularly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120208 Termination date: 20130725 |