CN105553352A - Low-cost starting device for brushless doubly-fed motor - Google Patents
Low-cost starting device for brushless doubly-fed motor Download PDFInfo
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- CN105553352A CN105553352A CN201511015247.1A CN201511015247A CN105553352A CN 105553352 A CN105553352 A CN 105553352A CN 201511015247 A CN201511015247 A CN 201511015247A CN 105553352 A CN105553352 A CN 105553352A
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Abstract
The invention discloses a low-cost starting device for a brushless doubly-fed motor, and relates to the technical field of brushless doubly-fed motors. According to the low-cost starting device, a DC output of a frequency converter is cut off; and all switch tubes VT1, VT2, VT3, VT4, VT5 and VT6 of an upper bridge arm and a lower bridge arm of a three-phase full-bridge inverting circuit VI are conducted, so that a control winding P<C> is shortened. Resources of the frequency converter can be fully utilized, namely a starting resistor can be replaced to shorten the control winding P<C> by controlling all switch tube devices of the inverting circuit through software without the starting resistor; the volume of equipment can be reduced; and the cost can be saved.
Description
Technical field
The present invention relates to brushless dual-feed motor technical field, particularly relate to the low cost starting drive of brushless dual-feed motor.
Background technology
Brushless dual-feed motor is New-type electric machine.Brushless dual-feed motor develops from cascade machine, (is respectively power winding P by two cover stator winding
pwith controlled winding P
c) and the rotor of particular design realize brushless structure; By to controlled winding P
cvariable voltage variable frequency control realization brushless dual-feed motor variable speed constant frequency generator or electrical variable frequency adjustable speed run.During as motor running, relate to starting problem.The startup of brushless double-fed motor refers to that motor is 0 process rising to nature synchronous speed N from rotating speed.
Current brushless double-fed motor Starting mode can be divided into synchronous averaging and asynchronous starting, and synchronous averaging is that brushless double-fed motor two overlaps stator winding and adds driving source simultaneously, and now motor shows synchronous machine characteristic.Specifically power winding P
padd power frequency supply excitation, controlled winding P
cadd variable frequency power supply excitation, controlled winding P
cfrequency is increased to 0Hz from-50Hz, and corresponding motor rotating speed just can be increased to N thus actuating motor from 0.The problem of synchronous averaging is to need flat-out frequency converter, and this and brushless double-fed motor can use the original intention of portion capacity Frequency Converter Control to disagree, so the Starting mode of main flow or asynchronous starting.
Asynchronous starting is the power winding P of brushless double-fed motor
padd driving source, controlled winding P
cshort circuit or configure special starting device, now motor meets asynchronous motor properties.Asynchronous starting particularly high-power brushless double-fed motor asynchronous starting time need to solve excessive the brought various problems of starting current identical when starting with asynchronous machine.In order to solve the excessive problem of starting current, the asynchronous starting method that prior art mainly adopts is the Starting mode that special configuration frequency sensitive trheostat or adjustable resistor start, but which considerably increases electric drilling match equipment and production run cost.
Summary of the invention
The object of the invention is to avoid weak point of the prior art and the low cost starting drive providing brushless dual-feed motor, the low cost starting drive of this brushless dual-feed motor can reduce costs, and also can reduce quantity and the volume of electric drilling match equipment.
Object of the present invention is achieved through the following technical solutions:
There is provided a kind of low cost starting method of brushless dual-feed motor, motor has been connected to power winding P
p, controlled winding P
cand frequency converter, the DC output side of frequency converter is connected to three-phase full-bridge inverting circuit VI, and the output of three-phase full-bridge inverting circuit VI is through controlled winding P
creceive motor, this method comprises the following steps performed successively:
The first step: the direct current disconnecting frequency converter exports;
Second step: then whole switching tube VT1, VT2, VT3, VT4, VT5, VT6 of the upper and lower brachium pontis of conducting three-phase full-bridge inverting circuit VI are with short circuit controlled winding P
c.
Frequency converter also comprises three-phase bridge rectification circuit VR, be connected to bus capacitor C between three-phase bridge rectification circuit VR and three-phase full-bridge inverting circuit VI, and the described first step is serially connected with bus-tie circuit breaker K particular by the bus between the bus capacitor C and three-phase full-bridge inverting circuit VI of frequency converter
d, and then disconnect bus-tie circuit breaker K
dthe direct current disconnecting frequency converter exports.
The 3rd step is performed: to the power winding P of motor after second step
papplying power frequency supply encourages, and makes motor asynchronous starting.
Power winding P
pand be provided with the 3rd K switch M3 between power frequency supply, described 3rd step is, by closed 3rd K switch M3, power frequency supply is added to power winding P
p.
The 4th step is performed: motor start-up also, after stable operation, makes frequency converter be switched to conventional Motor Control operational mode after the 3rd step.
The concrete operations making frequency converter be switched to conventional Motor Control operational mode of described 4th step are: closed first K switch M1, three-phase alternating-current supply is made to charge to bus capacitor C through soft start resistance R, input reactance device L and three phase full bridge uncontrollable rectifier circuit VR, after DC bus-bar voltage reaches preset range, the closed second switch KM2 in parallel with soft start resistance R again, complete the soft start of frequency converter, then make frequency converter be controlled winding P
cpower supply, and then by motor by power winding P
pthe asynchronous operation state of one group of Power supply is transferred to controlled winding P
cwith power winding P
pthe synchronous operation state that two groups of power supplys are powered simultaneously.
The frequency converter that makes in described 4th step is controlled winding P
cthe concrete operations of power supply are: closed bus-tie circuit breaker K
d, turn off whole switching tubes of the three-phase full-bridge inverting circuit VI of frequency converter, control frequency converter and export suitable frequency to controlled winding P
c, the actual speed of this frequency and motor matches.
After the 4th step, perform the 5th step: after motor enters synchronous operation pattern, control frequency converter and reduce output frequency gradually, until export as direct current, now brushless double-fed motor just operates in nature synchronous speed N, completes start-up course.
beneficial effect of the present invention:
The present invention is exported by the direct current disconnecting frequency converter, whole switching tube VT1, VT2, VT3, VT4, VT5, VT6 of the more upper and lower brachium pontis of conducting three-phase full-bridge inverting circuit VI are with short circuit controlled winding P
c, frequency converter own resources can be made full use of, namely not need to use starting resistance, by the full control switching tube device of software control inverter circuit, starting resistance just can be replaced controlled winding P
cshort circuit, can reduce the quantity of electric drilling match equipment, saves cost.
Further, the present invention is by controlling upper and lower brachium pontis switching tube VT1, VT3, VT5, VT2, VT4, VT6 conducting simultaneously of three-phase full-bridge inverting circuit VI, electric current on Motor Control winding is shared jointly by the switching device of upper and lower brachium pontis, the electric current flowing through switching device can be greatly reduced, and then reduce the starting current of motor, without the need to special configuration frequency sensitive trheostat or adjustable resistor, also can use the frequency converter not having braking circuit, and then save the quantity of cost and reduction electric drilling match equipment.
Accompanying drawing explanation
Utilize accompanying drawing to be described further invention, but the embodiment in accompanying drawing does not form any limitation of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the following drawings.
Fig. 1 is the circuit diagram that the low cost starting method of brushless dual-feed motor of the present invention controls.
Embodiment
The invention will be further described with the following Examples.
The low cost starting method of the brushless dual-feed motor of the present embodiment, motor has been connected to power winding P
p, controlled winding P
cand frequency converter, the DC output side of frequency converter is connected to three-phase full-bridge inverting circuit VI, and the output of three-phase full-bridge inverting circuit VI is through controlled winding P
creceive motor, frequency converter also comprises three-phase bridge rectification circuit VR, be connected to bus capacitor C between three-phase bridge rectification circuit VR and three-phase full-bridge inverting circuit VI, this method comprises the step performed successively as follows:
The first step: be serially connected with bus-tie circuit breaker K by the bus between the bus capacitor C and three-phase full-bridge inverting circuit VI of frequency converter
d, and then disconnect bus-tie circuit breaker K
dthe direct current disconnecting frequency converter exports;
Second step: then whole switching tube VT1, VT2, VT3, VT4, VT5, VT6 of the upper and lower brachium pontis of conducting three-phase full-bridge inverting circuit VI are with short circuit controlled winding P
c.
3rd step: power frequency supply is added to power winding P by closed 3rd contactor KM3
p, make motor asynchronous starting.
4th step: motor start-up after stable operation, closed first contactor KM1, three-phase alternating-current supply is made to charge to bus capacitor C through soft start resistance R, input reactance device L and three phase full bridge uncontrollable rectifier circuit VR, after DC bus-bar voltage reaches preset range, the closed second contactor KM2 in parallel with soft start resistance R again, complete the soft start of frequency converter, then close bus-tie circuit breaker K again
d, turn off whole switching tubes of the three-phase full-bridge inverting circuit VI of frequency converter, control frequency converter and export suitable frequency to controlled winding P
c, the actual speed of this frequency and motor matches, and then by motor by power winding P
pthe asynchronous operation state of one group of Power supply is transferred to controlled winding P
cwith power winding P
pthe synchronous operation state that two groups of power supplys are powered simultaneously.
5th step: after motor enters synchronous operation pattern, controls frequency converter and reduces output frequency gradually, until export as direct current, now brushless double-fed motor just operates in nature synchronous speed N, completes start-up course.
In start-up course, the on off state of contactless contactor state and other gate-controlled switch devices all remains unchanged.
The present embodiment is exported by the direct current disconnecting frequency converter, whole switching tube VT1, VT2, VT3, VT4, VT5, VT6 of the more upper and lower brachium pontis of conducting three-phase full-bridge inverting circuit VI are with short circuit controlled winding P
c, frequency converter own resources can be made full use of, namely not need to use starting resistance, by the full control switching tube device of software control inverter circuit, starting resistance just can be replaced controlled winding P
cshort circuit, can reduce the quantity of electric drilling match equipment, saves cost.
Further, the present embodiment is by controlling upper and lower brachium pontis switching tube VT1, VT3, VT5, VT2, VT4, VT6 conducting simultaneously of three-phase full-bridge inverting circuit VI, electric current on Motor Control winding is shared jointly by the switching device of upper and lower brachium pontis, the electric current flowing through switching device can be greatly reduced, and then reduce the starting current of motor, without the need to special configuration frequency sensitive trheostat or adjustable resistor, also can use the frequency converter not having braking circuit, and then save the quantity of cost and reduction electric drilling match equipment.
The all method of the present embodiment or Part Methods, by setting up functional module construction, have been come by computer program instructions computer for controlling system, and these computer program instructions store in a computer-readable storage medium.
Finally should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although done to explain to the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (8)
1. the low cost starting drive of brushless double-fed motor, motor has been connected to power winding P
p, controlled winding P
cand frequency converter, the DC output side of frequency converter is connected to three-phase full-bridge inverting circuit VI, and the output of three-phase full-bridge inverting circuit VI is through controlled winding P
creceive motor, this device comprise call successively as lower module:
First module: the direct current disconnecting frequency converter exports;
Second module: then whole switching tube VT1, VT2, VT3, VT4, VT5, VT6 of the upper and lower brachium pontis of conducting three-phase full-bridge inverting circuit VI are with short circuit controlled winding P
c.
2. the low cost starting drive of brushless double-fed motor as claimed in claim 1, it is characterized in that: frequency converter also comprises three-phase bridge rectification circuit VR, be connected to bus capacitor C between three-phase bridge rectification circuit VR and three-phase full-bridge inverting circuit VI, and described first module is serially connected with bus-tie circuit breaker K particular by the bus between the bus capacitor C and three-phase full-bridge inverting circuit VI of frequency converter
d, and then disconnect bus-tie circuit breaker K
dthe direct current disconnecting frequency converter exports.
3. the low cost starting drive of brushless double-fed motor as claimed in claim 2, is characterized in that: after the second module, call the 3rd module: to the power winding P of motor
papplying power frequency supply encourages, and makes motor asynchronous starting.
4. the low cost starting drive of brushless double-fed motor as claimed in claim 3, is characterized in that: power winding P
pand be provided with the 3rd K switch M3 between power frequency supply, described 3rd module is, by closed 3rd K switch M3, power frequency supply is added to power winding P
p.
5. the low cost starting drive of brushless double-fed motor as claimed in claim 3, is characterized in that: after the 3rd module, call four module: motor start-up also, after stable operation, makes frequency converter be switched to conventional Motor Control operational mode.
6. the low cost starting drive of brushless double-fed motor as claimed in claim 5, it is characterized in that: the concrete operations making frequency converter be switched to conventional Motor Control operational mode of described four module are: closed first K switch M1, three-phase alternating-current supply is made to charge to bus capacitor C through soft start resistance R, input reactance device L and three phase full bridge uncontrollable rectifier circuit VR, after DC bus-bar voltage reaches preset range, the closed second switch KM2 in parallel with soft start resistance R again, complete the soft start of frequency converter, then make frequency converter be controlled winding P
cpower supply, and then by motor by power winding P
pthe asynchronous operation state of one group of Power supply is transferred to controlled winding P
cwith power winding P
pthe synchronous operation state that two groups of power supplys are powered simultaneously.
7. the low cost starting drive of brushless double-fed motor as claimed in claim 6, is characterized in that: the frequency converter that makes in described four module is controlled winding P
cthe concrete operations of power supply are: closed bus-tie circuit breaker K
d, turn off whole switching tubes of the three-phase full-bridge inverting circuit VI of frequency converter, control frequency converter and export suitable frequency to controlled winding P
c, the actual speed of this frequency and motor matches.
8. the low cost starting drive of brushless double-fed motor as claimed in claim 5, it is characterized in that: after four module, call the 5th module: after motor enters synchronous operation pattern, control frequency converter and reduce output frequency gradually, until export as direct current, now brushless double-fed motor just operates in nature synchronous speed N, completes start-up course.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511015247.1A CN105553352A (en) | 2015-12-31 | 2015-12-31 | Low-cost starting device for brushless doubly-fed motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511015247.1A CN105553352A (en) | 2015-12-31 | 2015-12-31 | Low-cost starting device for brushless doubly-fed motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105553352A true CN105553352A (en) | 2016-05-04 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511015247.1A Pending CN105553352A (en) | 2015-12-31 | 2015-12-31 | Low-cost starting device for brushless doubly-fed motor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557195A (en) * | 2009-04-29 | 2009-10-14 | 沈阳共创科技有限公司 | Frequency variation and speed governing system of brushless double fed motor |
| GB2460724A (en) * | 2008-06-13 | 2009-12-16 | Ehsan Abdi Jalebi | Torque-sensing control system for a brushless doubly fed machine (BDFM) |
| CN102868346A (en) * | 2012-08-16 | 2013-01-09 | 北京索德电气工业有限公司 | Brushless doubly-fed motor excitation control system and control method using same |
| CN104052356A (en) * | 2014-06-25 | 2014-09-17 | 合康变频科技（武汉）有限公司 | Variable-speed constant frequency electricity generation control device and electricity generation method based on brushless doubly-fed motor |
| CN204013310U (en) * | 2014-07-31 | 2014-12-10 | 湖南工程学院 | Brushless dual-feed motor direct Torque Control |
| CN204539039U (en) * | 2015-02-06 | 2015-08-05 | 西门子公司 | The drive circuit of motor |
-
2015
- 2015-12-31 CN CN201511015247.1A patent/CN105553352A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2460724A (en) * | 2008-06-13 | 2009-12-16 | Ehsan Abdi Jalebi | Torque-sensing control system for a brushless doubly fed machine (BDFM) |
| CN101557195A (en) * | 2009-04-29 | 2009-10-14 | 沈阳共创科技有限公司 | Frequency variation and speed governing system of brushless double fed motor |
| CN102868346A (en) * | 2012-08-16 | 2013-01-09 | 北京索德电气工业有限公司 | Brushless doubly-fed motor excitation control system and control method using same |
| CN104052356A (en) * | 2014-06-25 | 2014-09-17 | 合康变频科技（武汉）有限公司 | Variable-speed constant frequency electricity generation control device and electricity generation method based on brushless doubly-fed motor |
| CN204013310U (en) * | 2014-07-31 | 2014-12-10 | 湖南工程学院 | Brushless dual-feed motor direct Torque Control |
| CN204539039U (en) * | 2015-02-06 | 2015-08-05 | 西门子公司 | The drive circuit of motor |
Non-Patent Citations (1)
| Title |
|---|
| 许永顺: "无刷双馈电机直接转矩控制***的优化", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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Application publication date: 20160504 |
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