CN201317642Y - Frequency-variable electric block - Google Patents
Frequency-variable electric block Download PDFInfo
- Publication number
- CN201317642Y CN201317642Y CNU2008202175142U CN200820217514U CN201317642Y CN 201317642 Y CN201317642 Y CN 201317642Y CN U2008202175142 U CNU2008202175142 U CN U2008202175142U CN 200820217514 U CN200820217514 U CN 200820217514U CN 201317642 Y CN201317642 Y CN 201317642Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- links
- electric block
- inverter circuit
- dsp control
- 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.)
- Expired - Fee Related
Links
- 238000005070 sampling Methods 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
The utility model relates to a frequency-variable electric block, which comprises a motor (M) and a frequency conversion device, and is characterized in that the frequency conversion device comprises a rectifying circuit (1), a voltage sampling circuit (2), a DSP control circuit (3), a current sampling circuit (4) and an inverter circuit (5), and the input of the rectifying circuit (1) is connected with the municipal power, and the output of the rectifying circuit (1) is connected with the inverter circuit (5), and the output end of the inverter circuit (5) is connected with the input end of the motor (M), and the inverter circuit (5) is connected with the DSP control circuit (3), and the voltage sampling circuit (2) is connected with the rectifying circuit (1), and the voltage sampling circuit (2) is connected with the DSP control circuit (3), and the DSP control circuit (3) is connected with a single chip (6) which is provided with a manual-electric door control signal and an anti-slip multi-fuzzy algorithm control program. The frequency-variable electric block can improve the maneuverability of the electric block, and can enlarge the application range, and has the advantages of high transmission efficiency and electric power conservation.
Description
Technical field
The utility model relates to a kind of weight-lifting equipment, especially a kind of lifting electric block, specifically a kind of frequency conversion type electric block.
Background technology
Along with the continuous progress and the fast development of national economy of information techenology, converter technique is used widely in field of power supplies because of having series of advantages such as speed-regulating range width, driving efficiency height, economize on electricity be remarkable, is the energy-conservation project that state key is promoted.
Domestic existing electric block, particularly simple, inexpensive electric block is widely used in general object because of it is simple in structure, can under the situation of various diff-Hs, rise and fall, but if rising and falling of assembling precision instrument is because of its excessive velocities, just not competent.If install retarder and assembly pulley additional volume will be strengthened, cost increases severely.Because existing electric block all adopts special conical motor, owing to must open its electromagnetic brake earlier in the conical motor operational process, and in the operational process, also must keep its open mode, simultaneously because electric block is rising and the decline that is used for controlling weight, need very big moment during rising, restart after particularly aerial the stop, do not allow the slide hook; During decline, the potential energy of weight is transformed into kinetic energy, makes electrical motor be in generating state, and therefore existing universal frequency converter is difficult to be suitable for.Therefore, must be according to the characteristics otherwise designed of electric block.
Summary of the invention
The purpose of this utility model is at present electric block landing excessive velocities, not competent treasure and precision instrument play the requirement that falls slowly slowly, if install retarder and assembly pulley additional volume will be strengthened, the problem that cost increases severely designs a kind of frequency conversion type electric block.
The technical solution of the utility model is:
A kind of frequency conversion type electric block, the converter plant that comprises motor M and control motor speed, it is characterized in that described converter plant comprises rectifying circuit 1, voltage sampling circuit 2, DSP control circuit 3, current sampling circuit 4 and inverter circuit 5, the input of rectifying circuit 1 links to each other with the civil power three phase mains, the output of rectifying circuit 1 links to each other with the direct-flow input end of inverter circuit 5, the three-phase alternating current mouth of inverter circuit 5 links to each other with the three-phase alternating current input end of motor M, the control end of inverter circuit 5 links to each other with the control output end of DSP control circuit 3, the input end of voltage sampling circuit 2 links to each other with rectifying circuit 1 cooresponding voltage output end, the mouth of voltage sampling circuit 2 links to each other with DSP control circuit 3 cooresponding voltage signal sampling input ends, three input ends of current sampling circuit 4 link to each other with the three-phase output end of inverter circuit 5, the mouth of current sampling circuit 4 links to each other with DSP control circuit 3 cooresponding current sample input ends, and the signal input end of DSP control circuit 3 links to each other with the micro controller system 6 that torch gate control signal and anti-slide multimode paste algorithm controls program are installed.
Between two mouths of described rectifying circuit 1 and be connected to capacitor C.
All be serially connected with current-limiting resistance R on the three-phase output end of described inverter circuit 5.
The beneficial effects of the utility model:
The utility model has adopted frequency-variable controller first on electric block, filled up the blank of domestic electric block special converter.
The utility model can improve electric block regulation and control speed and driving efficiency greatly by changing electric block input supply voltage and frequency, and power savings is fairly obvious.
The utlity model has functions such as over voltage, under-voltage, input and output phase shortage, excess current, current imbalance, temperature protection, change characteristics greatly when taking into full account the electric block operation, realize FUZZY ALGORITHMS FOR CONTROL, reliable and stable operation; And the instant cut-off when walking at electric block can resume operation automatically.
In the utility model when starting, adopted high starting torque open loop vector control mode, after detecting band-type brake and unclamping, just begins the rate request according to external control, prolonged the life-span of band-type brake;
Description of drawings
Fig. 1 is an electric functional block diagram scheme drawing of the present utility model.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is further described.
As shown in Figure 1.
A kind of frequency conversion type electric block, the converter plant that comprises motor M and control motor speed, it is characterized in that described converter plant comprises rectifying circuit 1, voltage sampling circuit 2, DSP control circuit 3, current sampling circuit 4 and inverter circuit 5, between two mouths of rectifying circuit 1 and be connected to capacitor C, and all be serially connected with current-limiting resistance R on the three-phase output end of inverter circuit 5, as shown in Figure 1.The input of rectifying circuit 1 links to each other with the civil power three phase mains, the output of rectifying circuit 1 links to each other with the direct-flow input end of inverter circuit 5, the three-phase alternating current mouth of inverter circuit 5 links to each other with the three-phase alternating current input end of motor M, the control end of inverter circuit 5 links to each other with the control output end of DSP control circuit 3, the input end of voltage sampling circuit 2 links to each other with rectifying circuit 1 cooresponding voltage output end, the mouth of voltage sampling circuit 2 links to each other with DSP control circuit 3 cooresponding voltage signal sampling input ends, three input ends of current sampling circuit 4 link to each other with the three-phase output end of inverter circuit 5, the mouth of current sampling circuit 4 links to each other with DSP control circuit 3 cooresponding current sample input ends, and the signal input end of DSP (digital signal processing) control circuit 3 links to each other with the micro controller system 6 that torch gate control signal and anti-slide multimode paste algorithm controls program are installed.
Each related circuit of present embodiment all can adopt the scaling circuit on the conventional textbook to be realized, also can adopt corresponding integrated circuit to be equipped with Control Software and be realized.
Principle of work of the present utility model is:
n＝60f(1-s)/p (1)
The rotating speed of n-asynchronous motor in the formula;
The frequency of f-asynchronous motor;
The s-motor slip ratio;
P-electrical motor number of pole-pairs.
By formula (1) as can be known, rotation speed n is directly proportional with frequency f, as long as change the rotating speed that frequency f can change electrical motor, and when changing in the scope of frequency f at 0～50Hz, the non-constant width of motor speed setting range.Frequency control realizes speed setting by changing the electric electromechanics source frequency.
Increase the output voltage of frequency converter,, thereby improve the output torque of motor so that square relation that is directly proportional of the output torque of motor and voltage increases.Improve the technology of motor low speed output torque deficiency, can make motor at low speed, output torque during as (during Speedless sensor) 1Hz (to 4 utmost point motors, its rotating speed is approximately 100r/min) can reach motor in the torque of 50Hz power supply output (maximum be about torque rating 150%).For the V/F control of routine, the loss in voltage of motor increases relatively along with the reduction of motor speed, and this just causes owing to underexcitation, and makes motor can not obtain enough rotational forcees.In order to compensate this deficiency, the utility model comes small electromotor speed to reduce the loss in voltage that causes by improving voltage.
Frequency converter of the present utility model mainly adopts the AC-DC-AC mode, earlier power frequency AC is converted to direct supply by rectifying circuit 1 (also can adopt rectifier), and then direct supply is converted to frequency, the equal controollable source of AC of voltage to supply with the bridge motor M of electric block by inverter circuit 5.The frequency-variable controller circuit is made up of rectification, inversion and 4 parts of control.
The effect of rectifying circuit is: power frequency AC is converted to direct supply by rectifier.
The effect of inverter circuit is: direct supply is converted to frequency, the equal controollable source of AC of voltage to supply with electric block.
The effect of DSP control circuit is: by steering command and feedback signal (electric current, voltage sampling signal) output AC power source of inversion is controlled.
The utility model does not relate to the part prior art that maybe can adopt all same as the prior art to be realized.
Claims (3)
1, a kind of frequency conversion type electric block, the converter plant that comprises motor (M) and control motor speed, it is characterized in that described converter plant comprises rectifying circuit (1), voltage sampling circuit (2), DSP control circuit (3), current sampling circuit (4) and inverter circuit (5), the input of rectifying circuit (1) links to each other with the civil power three phase mains, the output of rectifying circuit (1) links to each other with the direct-flow input end of inverter circuit (5), the three-phase alternating current mouth of inverter circuit (5) links to each other with the three-phase alternating current input end of motor (M), the control end of inverter circuit (5) links to each other with the control output end of DSP control circuit (3), the input end of voltage sampling circuit (2) links to each other with the cooresponding voltage output end of rectifying circuit (1), the mouth of voltage sampling circuit (2) links to each other with the cooresponding voltage signal sampling input end of DSP control circuit (3), three input ends of current sampling circuit (4) link to each other with the three-phase output end of inverter circuit (5), the mouth of current sampling circuit (4) links to each other with the cooresponding current sample input end of DSP control circuit (3), and the signal input end of DSP control circuit (3) links to each other with the micro controller system (6) that torch gate control signal and anti-slide multimode paste algorithm controls program are installed.
2, frequency conversion type electric block according to claim 1 is characterized in that between two mouths of described rectifying circuit (1) and is connected to electric capacity (C).
3, frequency conversion type electric block according to claim 1 is characterized in that all being serially connected with current-limiting resistance (R) on the three-phase output end of described inverter circuit (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202175142U CN201317642Y (en) | 2008-12-01 | 2008-12-01 | Frequency-variable electric block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202175142U CN201317642Y (en) | 2008-12-01 | 2008-12-01 | Frequency-variable electric block |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201317642Y true CN201317642Y (en) | 2009-09-30 |
Family
ID=41196411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202175142U Expired - Fee Related CN201317642Y (en) | 2008-12-01 | 2008-12-01 | Frequency-variable electric block |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201317642Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102275843A (en) * | 2011-06-14 | 2011-12-14 | 张建祖 | Loop-chain electric hoist with voltage-type vector control transducer |
| CN102545776A (en) * | 2012-02-21 | 2012-07-04 | 天津天安起重电器有限公司 | Variable frequency control circuit and control method for electric hoist |
| CN102624326A (en) * | 2012-03-23 | 2012-08-01 | 冠亚机械工业（昆山）有限公司 | Chain block with frequency-variable controller |
| CN105060153A (en) * | 2015-08-15 | 2015-11-18 | 河南正大起重设备有限公司 | Novel energy-saving electric hoist |
-
2008
- 2008-12-01 CN CNU2008202175142U patent/CN201317642Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102275843A (en) * | 2011-06-14 | 2011-12-14 | 张建祖 | Loop-chain electric hoist with voltage-type vector control transducer |
| CN102275843B (en) * | 2011-06-14 | 2014-01-08 | 张建祖 | Loop-chain electric hoist with voltage-type vector control transducer |
| CN102545776A (en) * | 2012-02-21 | 2012-07-04 | 天津天安起重电器有限公司 | Variable frequency control circuit and control method for electric hoist |
| CN102624326A (en) * | 2012-03-23 | 2012-08-01 | 冠亚机械工业（昆山）有限公司 | Chain block with frequency-variable controller |
| CN105060153A (en) * | 2015-08-15 | 2015-11-18 | 河南正大起重设备有限公司 | Novel energy-saving electric hoist |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102882234A (en) | Method for controlling a frequency converter and frequency converter | |
| CN103701397B (en) | A kind of maglev molecular pump motor control assembly with power fails compensate function | |
| CN102340270A (en) | Energy saving control system and method for doubly-fed motor based on PLC and frequency converter | |
| CN201317642Y (en) | Frequency-variable electric block | |
| CN104333292A (en) | Load tracking type electricity saving device | |
| CN102170263B (en) | Pumping unit motor energy-saving control method and system | |
| CN203057040U (en) | Discrete frequency-conversion soft starting device with no speed sensor | |
| CN103066914B (en) | Direct power control system of high power factor induction motor | |
| CN202978810U (en) | Elevating mechanism based on double PWM variable-frequency double-fed motor | |
| CN101989831A (en) | Control device of induction motor and application thereof | |
| CN110112941A (en) | Inverter | |
| CN201224669Y (en) | Crane speed regulating device for conventional control | |
| CN104539197A (en) | Soft start and voltage reduction power saving comprehensive control device and method for asynchronous motor | |
| CN201750344U (en) | Three-phase AC induction motor frequency converter for automatic expanding door | |
| CN107565858A (en) | A kind of oil pumping in oil fields switched Reluctance Motor Control System | |
| CN103713559A (en) | Dragging system for electricity-stealing-prevention energy-saving pumping unit | |
| CN203237963U (en) | Electric hoist adopting frequency conversion technology and capable of being used in single-phase power source | |
| CN201560061U (en) | Novel automatic speed control device of crane | |
| CN110282551A (en) | A kind of permanent magnet synchronous motor parallel Operation Control method of crane large vehicle walking | |
| CN204168198U (en) | Load tracking type battery saving arrangement | |
| CN204848085U (en) | Novel energy -conserving electric block | |
| CN210745044U (en) | SRM direct instantaneous torque control system based on novel multi-level power circuit | |
| CN203313115U (en) | High power vector inversion control device | |
| CN201278500Y (en) | Apparatus for asynchronously and simultaneously implementing rotor variable frequency control by dragging multiple motors with an inverter | |
| CN202121546U (en) | Digitalized frequency converter control system device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090930 Termination date: 20161201 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |