CN2126751Y - Penetrating inverter type internal feedback speed regulating motor - Google Patents
Penetrating inverter type internal feedback speed regulating motor Download PDFInfo
- Publication number
- CN2126751Y CN2126751Y CN 92207909 CN92207909U CN2126751Y CN 2126751 Y CN2126751 Y CN 2126751Y CN 92207909 CN92207909 CN 92207909 CN 92207909 U CN92207909 U CN 92207909U CN 2126751 Y CN2126751 Y CN 2126751Y
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- inverter
- winding
- regulating
- motor
- feedback speed
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Abstract
The utility model relates to a penetrating inverter type internal feedback speed regulating motor, which is a stepless speed regulating draught fan being suitable for large high voltage, a medium draught fan and the speed regulation and the energy saving of a pump, belonging to the field of an ac speed regulating motor and comprising a motor body 1, a rectifier 2, an inverter 3, a reactor 4 and a control device 5. The utility model is characterized in that the inverter 3 is a penetrating inverter; the main return circuit thereof is same with that of an ordinary three-phase bridge type inverter; the control return circuit thereof adopts the control mode of asymmetric triggering phase, causing that the rated current and the maximum reactive power of a regulating winding are greatly decreased; the volume of the motor is small; the power factor is high; the cost is low. When a main winding and the regulating winding adopt Y/ delta different connection methods; the harmonic quality can be greatly decreased.
Description
The utility model belongs to the AC speed regulating motor technical field, is the extraordinary asynchronous motor that a kind of rotating speed can smooth adjustment in being lower than the synchronizing speed scope.The usefulness of the variable speed energy saving of the large and medium-sized blower fan of the most suitable high pressure of the utility model, water pump also is applicable to that the stepless speed regulation of other permanent torque manufacturing machine drags.
Inner feedback speed-regulating motor, be to use the high efficiency change revolutional slip speed adjusting technique that slip power internal feedback principle realizes, head sees the patent of invention that Liaoning Province The Designing Division of Fuxin Mining Bureau declares, it is 85104845 that name is called " three phase commutatorless motor with inverter " number of patent application, the technology that " the interior anti-SCR cascade speed control " of Great Wall, Beijing mechanical ﹠ electrical technology development company and 85104845 files provide is identical, abroad beyond example still.
The characteristics of inner feedback speed-regulating motor are by set up an adjusting winding on the stator of adjustable-speed motor, to provide an additional electromotive force through the power electronics ac equipment to the rotor winding on the one hand; Absorb the slip power that rotor produces on the other hand and make the active power of regulating winding, and change the additional electromotive force series connection of regulating winding thus with slip power and go into rotor loop and realize the unit speed governing for negative.It is compared with tandem control, does not have contravariant transformer, and the structure of governing system is greatly simplified, and cost reduces.
But, inverter in the electronic commutator that this inner feedback speed-regulating motor adopted is a triode thyristor cascade speed regulator, and take symmetrical lagging phase control mode, the power factor of inverter is low, especially when motor speed during near rated value, the inversion angle is 90 °, the electric current of regulating winding is perceptual reactive current, and amplitude maximum, this inductance current causes degaussing to motor body on the one hand, the main winding exciting curent is increased, make on the other hand and regulate the increase of winding own loss, both reduced the power of electric motor factor, increased the loss of motor again, in order to make main winding unlikely too high with the temperature rise of regulating winding, often need to strengthen the cross section of lead, cause the cost of motor to increase.
Take identical Y connection mode owing to regulate winding in the prior art with main winding in addition, the harmonic current of regulating in the winding all informs main winding through electromagnetic induction, so exist supply harmonic is polluted bigger problem.
The purpose of this utility model is to provide a kind of High Power Factor simple in structure, with low cost, the inner feedback speed-regulating motor of low harmonic wave.
The purpose of this utility model is achieved in that and changes original plain edition inverter into through inverter, its major loop structure is identical with common three-phase bridge type converter, and on control mode, adopt asymmetric triggering phase control, when pilot angle changes, the phenomenon that two thyristors conducting simultaneously in a period of time of same brachium pontis occurs, and caused the temporary transient short circuit of DC side, regulate the winding electric flow valuve and reduce thereby make to flow through, meanwhile the power of electric motor factor just increases, and harmonic effects is improved.The conductor cross-section of regulating winding just needn't strengthen, so the cost of motor also just reduces.
Further narrate with drawings and Examples below:
Fig. 1 is the structural representation of this adjustable-speed motor.
Fig. 2 is the interior three winding connection schematic diagrames of the motor body of this adjustable-speed motor.
By Fig. 1,2 as can be known, this through inverter type inner feedback speed-regulating motor is by comprising stator, rotor, regulate the motor body 1 of winding, electronic commutator is by electron rectifier 2, inverter 3, smoothing reactor 4 and inverter controlling apparatus 5 are formed, rotor winding and electron rectifier 2 link, regulating winding and inverter 3 major loops links, electron rectifier 2 links by smoothing reactor 4 and inverter 3, it is characterized in that described inverter 3 is a through inverter, its major loop is identical with common three-phase bridge type converter, and its control loop is taked asymmetric triggering phase control.
It is constant in force the trigger impulse of one group of thyristor in the three-phase bridge type converter (anode group or common cathode group) to be fixed on minimum inverterangle min place altogether, the trigger impulse of other one group of thyristor is adjustable continuously in the phase shift range of β min＜α＜180 °-β min, like this, when pilot angle α after α min direction moves, the phenomenon that two thyristors conducting simultaneously in a period of time of same bridge-type arm occurs, caused the temporary transient short circuit of DC side, the current value that flows through the adjusting winding is reduced, the rated current Ie that regulates winding is close with rotor winding rated current Ie, and now adopt present technique can be reduced to 60% of rotor winding rated current Ie, and maximum reactive power also is reduced to original 58%.
In addition, regulate the influence of winding harmonic current to main winding in order to improve, winding is different with the connection of main winding with regulating, promptly when main winding be Y when connecing, adjusting winding employing △ connects; When main winding is △ when connecing, regulating winding is that Y connects.Be connected to non-linear active inverter owing to regulate winding, its phase current waveform is a square wave, when distortion current is by the adjusting winding like this, in motor, produce space harmonics and time harmonic, wherein space harmonics is inhibited by the distribution of regulating winding coil, short square effect, and time harmonic then informs main winding and power supply by the mutual inductance effect.When the adjusting winding is identical with the main winding connection, the current waveform that the adjusting winding informs main winding is the same with regulating the winding phase current, its distortion factor μ=0.827, and when the connection of regulating winding and main winding not simultaneously because two windings have 30 ° of phase differences around electric current, when the phase current of regulating winding is synthesized to the main winding line current, become staircase waveform by square wave, harmonic content reduces, distortion factor μ=0.955, thus its harmonic pollution to electric current is reduced greatly.
In sum, this variable-speed motor has improved again widely than existing technology, and its volume simple in structure is little, and cost is low, the power factor height, and harmonic pollution is little. This motor does not have whole sub-three-phase brush motor with inverse type to be compared, and its copper consumption of regulating winding can reduce 40%, and harmonic effects reduces 54%, and manufacturing cost can reduce by 20%, has good economic worth.
Claims (3)
1, a kind of through inverter type inner feedback speed-regulating motor, by stator, rotor, regulate the motor body 1 of winding, electronic commutator is by electron rectifier 2, inverter 3, smoothing reactor 4 and inverter controlling apparatus 5 are formed, rotor winding and electron rectifier 2 link, regulating winding and inverter 3 major loops links, electron rectifier 2 links by smoothing reactor 4 and inverter 3, it is characterized in that described inverter 3 is a through inverter, its major loop is identical with common three-phase bridge type converter, and its control loop is taked asymmetric triggering phase control.
2, by the described through inverter type inner feedback speed-regulating motor of claim 1, the asymmetric triggering phase control that it is characterized in that the control loop of described through inverter 3 is fixed on minimum inverterangle min place for the trigger impulse of organizing thyristor one by one, and another trigger impulse of organizing thyristor is adjustable continuously in the phase shift range of β min＜α＜180 °-β min.
3, by the described through inverter type inner feedback speed-regulating motor of claim 1, it is characterized in that described motor body 1 its main winding is different with the connection of regulating winding, when main winding is Y when connecing, regulating winding is that △ connects, when main winding is △ when connecing, regulating winding is that Y connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92207909 CN2126751Y (en) | 1992-04-27 | 1992-04-27 | Penetrating inverter type internal feedback speed regulating motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92207909 CN2126751Y (en) | 1992-04-27 | 1992-04-27 | Penetrating inverter type internal feedback speed regulating motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2126751Y true CN2126751Y (en) | 1993-02-03 |
Family
ID=33762305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92207909 Expired - Lifetime CN2126751Y (en) | 1992-04-27 | 1992-04-27 | Penetrating inverter type internal feedback speed regulating motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2126751Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004086594A1 (en) * | 2003-03-26 | 2004-10-07 | Zhengfeng Zhu | Star delta connection bias magnetic type reluctance motor |
-
1992
- 1992-04-27 CN CN 92207909 patent/CN2126751Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004086594A1 (en) * | 2003-03-26 | 2004-10-07 | Zhengfeng Zhu | Star delta connection bias magnetic type reluctance motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |