CN100345372C - Frequency variable speed-adjusting mechanism - Google Patents
Frequency variable speed-adjusting mechanism Download PDFInfo
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- CN100345372C CN100345372C CNB2004100197336A CN200410019733A CN100345372C CN 100345372 C CN100345372 C CN 100345372C CN B2004100197336 A CNB2004100197336 A CN B2004100197336A CN 200410019733 A CN200410019733 A CN 200410019733A CN 100345372 C CN100345372 C CN 100345372C
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Abstract
The present invention relates to a frequency conversion and speed adjustment which comprises a brushless double-feed motor and a frequency conversion device, wherein, the frequency conversion device is connected with the motor. The frequency conversion device is formed by connecting a frequency converter with an inversion feedback unit and a control unit of the brushless double-feed motor. The present invention has the advantages of compact structure and optimal method, controls the work rotation speed of the brushless duplex feeding motor by the frequency conversion device with small power and a frequency conversion power supply with low voltage, and can completely satisfy operating requirements of blowers and pumps, and a frequency conversion, speed adjustment and energy saving technique of the brushless double-feed motor can be used widely.
Description
Technical field
The invention belongs to machine field, relate to a kind of frequency control mechanism, be applicable to brushless dual-feed motor.
Background technology
Brushless dual-feed motor is a kind of New-type electric machine with speed governing advantage, and is comparatively advanced in the disclosed 02294621.7 Wound-rotor type brushless dual-feed motor of Chinese patent.The application of brushless dual-feed motor makes industry to the frequency control new mechanism that is more suitable for this kind motor more urgent requirement arranged.
Transducer power is identical with power of motor could to satisfy job requirement owing to existing common electric machine requires, and for the bigger high-voltage motor of power, uses the high voltage converter investment too high, has restricted applying of motor variable-frequency speed-regulating power-saving technology.Especially motor is dragged blower fan, load of the pumps, industry needs a kind of frequency control mechanism that is applicable to brushless dual-feed motor.
Summary of the invention
Problem to be solved by this invention is, overcomes the above-mentioned defective that the technology of taking over exists, and provide a kind of can be less converter plant power and lower variable frequency power supply voltage, the mechanism of control brushless dual-feed motor working speed.
The object of the invention provides a kind of brushless dual-feed motor frequency control mechanism, with the brushless dual-feed motor configuration less than the motor power output, be lower than the converter plant of power of motor winding operating voltage.
The present invention solves its technical problem and takes following technical scheme to realize, according to a kind of frequency control provided by the invention mechanism, comprise, brushless dual-feed motor and the converter plant that connects with motor, wherein, a brushless dual-feed motor has control winding and power winding, one converter plant, it connects an inversion feedback unit and brushless dual-feed motor control unit by frequency converter; Described frequency converter input terminal inserts the low-voltage electric network source, and its lead-out terminal connects the control winding of brushless dual-feed motor; The dc terminal of described inversion feedback unit is connected with frequency converter dc terminal terminal same polarity, and its output is parallel to frequency converter input terminal low voltage electric network end; The control unit of brushless dual-feed motor respectively with frequency converter, inversion feedback unit, frequency converter input supply terminal, control winding input and power winding input, connect by the control survey unit, control unit connects a computer.
The technical problem that the present invention solves can also adopt following technical measures further to realize:
Aforesaid frequency control mechanism, wherein, described control survey unit connecting sensor.
Aforesaid frequency control mechanism, wherein, described brushless dual-feed motor has two cover winding number of poles differences, and the few winding of number of poles is connected with the high-voltage fence power supply as the power winding; Number of poles winding how is connected with converter plant as the control winding.
Aforesaid frequency control mechanism, wherein, described brushless dual-feed motor has variable-pole winding, and power winding number of poles is few, is connected with the high-voltage fence power supply; Control winding number of poles is many, is connected with converter plant.
The present invention compared with prior art has significant advantage and beneficial effect.By above technical scheme as can be known, the present invention has following advantage at least under the structural arrangements of excellence:
The present invention with brushless dual-feed motor minority utmost point winding as a motor, most utmost point windings are as another motor, in specific speed adjustable range, brushless dual-feed motor speed adjustable range and actual engineering convention are coincide, realized with less converter plant power and lower variable frequency power supply voltage, the purpose of the working speed of control brushless dual-feed motor has very strong generalization.Converter plant of the present invention and brushless dual-feed motor are reasonable, simple configuration, can realize with less converter plant power and lower variable frequency power supply voltage, the working speed of control brushless dual-feed motor, thus, brushless dual-feed motor can be applied to blower fan, load of the pumps drags, especially the blower fan, the load of the pumps that drag of high-voltage motor can reduce the investment of speed regulating device greatly, make variable-frequency control technique become possibility, thereby save a large amount of electric energy in the extensive use of high-voltage motor field.The present invention contrasts prior art significant contribution and progress, is the good technology with novelty, creativeness, practicality really.
The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is a system wiring schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to according to embodiment provided by the invention, structure, feature and effect thereof, describe in detail as after.
As shown in Figure 1, a kind of frequency control mechanism, comprise, brushless dual-feed motor 1 and the converter plant 2 that connects with motor, wherein, select brushless dual-feed motor 1, be embedded with power winding Pp and control winding Pc on the stator, wherein, two winding number of poles differences, the few winding of number of poles is connected with the high-voltage fence power supply as power winding Pp; Number of poles winding how is connected with converter plant as control winding Pc;
Converter plant 2 connects an inversion feedback unit 24 by frequency converter 22 and brushless dual-feed motor control unit 23 is formed, and a universal frequency converter 22 input terminals insert the low-voltage electric network source, and its lead-out terminal connects the control winding Pc of brushless dual-feed motor; Aforementioned inversion feedback unit dc terminal is connected with frequency converter dc terminal terminal same polarity, and the output of inversion feedback unit is parallel to frequency converter 22 input terminal low voltage electric network ends; The control unit 23 of brushless dual-feed motor is that kernel control chip is formed with PLC, this control unit respectively with frequency converter 22, inversion feedback unit 24, frequency converter input supply terminal, Pc input and Pp input, connect by the control survey unit.
Design philosophy of the present invention:
Speed governing characteristics and engineering convention according to blower fan, load of the pumps:
The working flow Q ∝ N (first power of rotating speed) of blower fan, pump class transported substance
The operating pressure H ∝ N of blower fan, pump class transported substance
2(quadratic power of rotating speed)
Blower fan, the required shaft power P ∝ N of pump class work
3(cube of rotating speed)
As seen, the variation that speed is very little all can cause the variation that shaft power is bigger, and under the situation that satisfies actual needs flow and operating pressure, blower fan, pump class speed governing operation have obvious energy-saving effect.
In application of practical project, the nominal operation rotating speed of general blower fan, pump class is all corresponding with the same leg speed of common asynchronous moter.As:
The blower fan that two-pole machine drags, pump class working speed are 2940～2980rpm;
The blower fan that four utmost point motors drag, pump class working speed are 1460～1480rpm;
The blower fan that 6-pole motor drags, pump class working speed are 940～980rpm;
The blower fan that ends of the earth motor drags, pump class working speed are 720～740rpm;
When engineering design, usually press the dragging motor of the nominal operation rotating speed apolegamy corresponding power of blower fan, pump class because the variation of blower fan, pump class operating state, most occasions require its working speed by rated speed to low speed governing.
Therefore, the brushless dual-feed motor that is used for blower fan, pump class its operating rate scope when design must be considered the practical project convention, and its speed governing is generally only required from rated speed and generally promptly to be satisfied energy-conservation requirement fully to low speed governing about 30% to low speed governing.
The present invention is considered as the power winding Pp and the control winding Pc of brushless dual-feed motor the specific combination of two common electric machines based on known electric machine theory.
The relation of the magnetic flux density Bc of the magnetic flux density Bp of power winding Pp and control winding Pc:
Brushless dual-feed motor synchronous speed theoretical expression is:
Fc represents frequency converter out-put supply frequency
Fp represents the electric network source frequency
In fact aforesaid expression formula is only just set up when the magnetic flux density Bc size of the magnetic flux density Bp of power winding Pp and control winding Pc is suitable, and in speed regulation process, the magnetic flux density Bc of control winding changes, the scale of magnetic flux density Bp, the Bc of power winding and control winding also is to change, thereby N synchronous speed and not exclusively changing with fc, its actual speed can be below or above theoretical synchronous speed.
As long as when brushless dual-feed motor is designed, make power winding Bp＞control winding Bc, get final product guaranteed output winding Pp input power Temp greater than control winding Pc input power Temc, to realize the more powerful motor power output of smaller power brushless dual-feed motor converter plant control.
The mode of connection of invention mechanism: the less winding of brushless dual-feed motor number of poles is connected with electric network source as power winding Pp, and electric network source frequency f p is generally 50Hz, and power winding number of poles can be 2,4,6,8 etc.; The more winding of brushless dual-feed motor number of poles is connected with converter plant as control winding Pc, and control winding number of poles can be 4,6,8,10,12 etc., and the combination principle of the two is:
Power winding Pp number of poles＜control winding Pc number of poles; Stator two windings are with the phase sequence wiring.
When working with the present invention, brushless dual-feed motor starts with converter plant by control winding Pc, and can be generally below 65% of power winding Pp synchronous speed in certain range of speeds work.
When brushless dual-feed motor needs the work of higher rotation speed scope, be 65% when above of power winding Pp synchronous speed, power winding Pp can be inserted electric network source, this moment, the brushless dual-feed motor rotating speed was away from power winding Pp synchronous speed, and it is, the highest until near power winding Pp synchronous speed with higher slippage rotation speed operation.
The converter plant 2 that the present invention uses universal frequency converter 22 configuration inversion feedback units 24 and motor control unit 23 to form, brushless dual-feed motor is when working than low engine speed range, the slip energy of part from the power winding will be arranged, after surpassing control winding Pc and needing, turn back to electrical network by the inversion feedback unit, how much feedback energy is regulated by control unit therebetween.
The optimal field of the present invention is blower fan, the load of the pumps that high-voltage motor drags, and the speed adjustable range of its motor is controlled at 65%～100% of power winding synchronous speed.
In a word, brushless dual-feed motor is a kind of New-type electric machine, is embedded with two a kinds of cover or two cover windings that number of pole-pairs is different on this motor stator, and rotor is provided with cover identical with the stator winding number of pole-pairs or two cover windings or is " special cage modle " winding construction.Brushless dual-feed motor when work, winding power supply that gets access to grid on the stator, another winding connects converter plant, and the frequency of regulating this converter plant just can realize the brushless dual-feed motor speed governing operation.Power division between stator two windings depends on the size of two winding magnetic close (Bp, Bc).Generally, the Electromagnetic Design of brushless dual-feed motor has determined two winding magnetic close (relations of distribution of Bp＞Bc), that is the power division ratio between two windings.The winding that connects converter plant is called control winding Pc, and its power is less than the power winding Pp that is connected with high-voltage fence.
The model of quoting elementary cell among the present invention is as follows:
Brushless dual-feed motor 1: stator is a double-winding structure, and rotor is special cagelike structure; Pp=1, Pc=3; Converter plant 2:22 selects the universal frequency converter TD2000-4TXXXX of Ai Mosheng for use; 23 control unit core components are selected Siemens PLC CS7-300 for use; 24 inversion feedback units are selected model IPC-PF for use.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, according to different application scenarios, the power supply program of aforesaid two windings and the control mode of the mode of connection and frequency converter, can change to some extent, it still belongs to technical scheme of the present invention.Every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (4)
1. a frequency control mechanism comprises, brushless dual-feed motor and the converter plant that connects with motor, wherein,
One brushless dual-feed motor has control winding and power winding,
One converter plant, it connects an inversion feedback unit and brushless dual-feed motor control unit by frequency converter;
Described frequency converter input terminal inserts the low-voltage electric network source, and its lead-out terminal connects the control winding of brushless dual-feed motor;
The dc terminal of described inversion feedback unit is connected with frequency converter dc terminal terminal same polarity, and its output is parallel to frequency converter input terminal low voltage electric network end;
The control unit of brushless dual-feed motor respectively with frequency converter, inversion feedback unit, frequency converter input supply terminal, control winding input and power winding input, connect by the control survey unit, control unit connects a computer.
2. frequency control as claimed in claim 1 mechanism is characterized in that: described control survey unit connecting sensor.
3. frequency control as claimed in claim 1 or 2 mechanism is characterized in that: described brushless dual-feed motor has two cover winding number of poles differences, and the few winding of number of poles is connected with the high-voltage fence power supply as the power winding; Number of poles winding how is connected with converter plant as the control winding.
4. claim 1 or 2 described frequency control mechanisms, it is characterized in that: described brushless dual-feed motor has variable-pole winding, and power winding number of poles is few, is connected with the high-voltage fence power supply; Control winding number of poles is many, is connected with converter plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100197336A CN100345372C (en) | 2004-06-23 | 2004-06-23 | Frequency variable speed-adjusting mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100197336A CN100345372C (en) | 2004-06-23 | 2004-06-23 | Frequency variable speed-adjusting mechanism |
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| CN1713510A CN1713510A (en) | 2005-12-28 |
| CN100345372C true CN100345372C (en) | 2007-10-24 |
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| CNB2004100197336A Expired - Fee Related CN100345372C (en) | 2004-06-23 | 2004-06-23 | Frequency variable speed-adjusting mechanism |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102244497B (en) * | 2011-07-08 | 2013-05-08 | 大禹电气科技股份有限公司 | Frequency conversion control method and device |
| CN104601073B (en) * | 2015-02-12 | 2017-04-12 | 福州大学 | Vector control asynchronous motor speed adjusting method combining pole changing with frequency changing |
| CN113074027A (en) * | 2021-04-08 | 2021-07-06 | 西安热工研究院有限公司 | Speed regulating system suitable for thermal power generating unit circulating water system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5028804A (en) * | 1989-06-30 | 1991-07-02 | The State Of Oregon Acting By And Through The State Board Of Higher Education On Behalf Of Oregon State University | Brushless doubly-fed generator control system |
| CN2586286Y (en) * | 2002-12-13 | 2003-11-12 | 华中科技大学 | A.C. brushless double-feedback dynamo |
| CN2588646Y (en) * | 2002-12-27 | 2003-11-26 | 河北工业大学电工厂 | Wound brushless double-feeding motor |
| CN2741272Y (en) * | 2004-06-23 | 2005-11-16 | 河北工业大学电工厂 | High-slip frequency-variable speed regulator |
-
2004
- 2004-06-23 CN CNB2004100197336A patent/CN100345372C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5028804A (en) * | 1989-06-30 | 1991-07-02 | The State Of Oregon Acting By And Through The State Board Of Higher Education On Behalf Of Oregon State University | Brushless doubly-fed generator control system |
| CN2586286Y (en) * | 2002-12-13 | 2003-11-12 | 华中科技大学 | A.C. brushless double-feedback dynamo |
| CN2588646Y (en) * | 2002-12-27 | 2003-11-26 | 河北工业大学电工厂 | Wound brushless double-feeding motor |
| CN2741272Y (en) * | 2004-06-23 | 2005-11-16 | 河北工业大学电工厂 | High-slip frequency-variable speed regulator |
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Owner name: RENERGY ELECTRIC TIANJIN LTD. Free format text: FORMER OWNER: HEBEI POLYTECHNICAL UNIV. ELECTRIC FACTORY Effective date: 20090703 |
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Effective date of registration: 20090703 Address after: No. 39 Minhe Road, Xiqing Economic Development Zone, Tianjin Patentee after: Tianjin REnergy Electric Ltd. Address before: No. 8, glorious road, Hongqiao District, Tianjin Patentee before: Electric Factory, Hebei Polytechnic Univ. |
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Granted publication date: 20071024 Termination date: 20180623 |
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