CN202332503U - Auto-transformer core capable of realizing smooth switching for starting of high voltage motor - Google Patents
Auto-transformer core capable of realizing smooth switching for starting of high voltage motor Download PDFInfo
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- CN202332503U CN202332503U CN2011202976496U CN201120297649U CN202332503U CN 202332503 U CN202332503 U CN 202332503U CN 2011202976496 U CN2011202976496 U CN 2011202976496U CN 201120297649 U CN201120297649 U CN 201120297649U CN 202332503 U CN202332503 U CN 202332503U
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- transformer core
- iron core
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Abstract
The utility model discloses an auto-transformer core capable of realizing smooth switching for the starting of a high voltage motor. The auto-transformer core is a three-phase core limb (1) consisting of a plurality of small discuses (2). A nonmagnetic material (3) is arranged between every two adjacent small discuses (2). The thickness of the nonmagnetic materials (3) is regulated to regulate the magnitude of a reactance value. The auto-transformer core has the advantages that the thickness of the nonmagnetic materials is regulated to regulate the reactance value of a series coil, and the magnitude of the reactance value can ensure that the end voltage of the motor keeps constant before and after a star-point switch is turned off to realize smooth switching, so that the problem of impact on the switching of the motor is solved, and the motor is long in service life and high in cost performance.
Description
Technical field
The utility model relates to the electric motor starting technical field, a kind ofly specifically realizes taking over seamlessly the autotransformer iron core that is used for high-voltage motor starting.
Background technology
Traditional autotransformer has twice switching in the process of actuating motor; Can cause twice sudden change of motor terminal voltage; Because of square being directly proportional of motor terminal voltage with torque, must bring the sudden change of torque, unit is caused great mechanical shock; Have a strong impact on unit useful life, so autotransformer is promoted not obtaining aspect the high-voltage motor starting; At present high-voltage motor mainly adopts water resistance starting, but water resistance starting has following shortcoming: volume is big, troublesome maintenance, poor stability, starting performance are influenced by ambient temperature big, so also very immature.
The utility model content
The purpose of the utility model is that design is a kind of when solving traditional auto-transformer starting motor, twice sudden change problem of motor terminal voltage, and that can realize level and smooth shock-free switching a kind ofly realizes taking over seamlessly the autotransformer iron core that is used for the high-voltage motor starting.
The utility model is a kind of, and to realize taking over seamlessly the autotransformer iron core that is used for the high-voltage motor starting be tri-phase iron core post 1; Described tri-phase iron core post 1 is made up of a plurality of little discuses 2; Described a plurality of little discus 2 is at least 3, comprises nonmagnetic substance 3 between the little discus 2.
The size of the size adjustment reactance value of the thickness of nonmagnetic substance 3, the size of reactance value is determined by following formula:
(L: inductance value, A
e: magnetic circuit sectional area, l
g: nonmagnetic substance height, l
c: the length of magnetic path, μ
r: iron core relative permeability N: the number of turn), can know: after the reactor basic parameter is confirmed, through the height l of adjustment nonmagnetic substance by formula
gUnder the condition of (being iron core air gap), can change the size of reactance amount L, nonmagnetic substance is thick more, and inductance value is more little, and vice versa.Again because of reactance value X
1=2 π fL (X
1: reactance value, f: supply frequency) reactance value changes along with the change of inductance value.
A kind of advantage that realizes taking over seamlessly the autotransformer iron core that is used for the high-voltage motor starting of the utility model is: the reactance value of adjusting series coil through adjustment nonmagnetic substance thickness; The size of its value can guarantee that motor terminal voltage separately remains unchanged front and back at the asterism switch; Realize that the bottle sliding cutting changes; Solved motor switching shock problem, thereby made the motor long service life, cost performance is high.
Thereby the reactance value of the utility model adjustment coil solves motor switching shock problem; Be achieved in that the starting initial stage; Motor starts under the autotransformer state, and motor terminal voltage is by autotransformer tap k decision, and this stage is consistent with traditional single-circuit transformer performance.
In the starting later stage, along with counter electromotive force of motor is set up, current of electric progressively descends; Autotransformer asterism switch QF3 breaks off; This moment, motor transferred the string reactor starting to by auto-transformer starting, and promptly motor M and autotransformer series coil L constitute series relationship, and motor continues starting.The core content of this patent is: through special means the bigger reactance value of autotransformer series coil L is reduced to a certain suitable value; Do not hinder simultaneously the function of losing autotransformer; The size of series coil reactance value can guarantee that motor terminal voltage remains unchanged, and realizes taking over seamlessly for the first time before and after asterism switch QF3 branch is opened.
After motor changed the string reactor starting over to, current of electric continued decay, because of series coil L is fixed and value; And numerical value is less, and the pressure drop on the series coil reduces along with the current of electric decay, and motor terminal voltage raises gradually; When motor terminal voltage near line voltage, and series coil L went up pressure drop near 0 o'clock, by-pass switch QF2 closes a floodgate; Impact also very for a short time, solved switching shock problem for the second time.
Description of drawings
Fig. 1 is a kind of structural representation of realizing taking over seamlessly the autotransformer iron core that is used for the high-voltage motor starting.
Fig. 2 is circuit theory diagrams.
Embodiment
According to Fig. 1, shown in Figure 2, a kind of to realize taking over seamlessly the autotransformer iron core that is used for high-voltage motor starting be tri-phase iron core post 1, and described tri-phase iron core post 1 is made up of a plurality of little discuses 2, comprises nonmagnetic substance 3 between the little discus 2.Little discus is pressed into an integral body, puts coil, two ends add upper cover plate, with bolt or fastening with rivet.
The size of the size adjustment reactance value of the thickness of nonmagnetic substance 3, the size of reactance value is determined by following formula:
(L: inductance value, A
e: magnetic circuit sectional area, l
g: nonmagnetic substance height, l
c: the length of magnetic path, μ
r: iron core relative permeability N: the number of turn), can know: after the reactor basic parameter is confirmed, through the height l of adjustment nonmagnetic substance by formula
gUnder the condition of (being iron core air gap), can change the size of reactance amount L, nonmagnetic substance is thick more, and inductance value is more little, and vice versa.Again because of reactance value X
1=2 π fL (X
1: reactance value, f: supply frequency) reactance value changes along with the change of inductance value.
Claims (1)
1. can realize taking over seamlessly the autotransformer iron core that is used for high-voltage motor starting and it is characterized in that for one kind: iron core is tri-phase iron core post (1), and described tri-phase iron core post (1) is made up of a plurality of little discuses (2), comprises nonmagnetic substance (3) between the little discus (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202976496U CN202332503U (en) | 2011-08-15 | 2011-08-15 | Auto-transformer core capable of realizing smooth switching for starting of high voltage motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202976496U CN202332503U (en) | 2011-08-15 | 2011-08-15 | Auto-transformer core capable of realizing smooth switching for starting of high voltage motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202332503U true CN202332503U (en) | 2012-07-11 |
Family
ID=46444475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202976496U Expired - Fee Related CN202332503U (en) | 2011-08-15 | 2011-08-15 | Auto-transformer core capable of realizing smooth switching for starting of high voltage motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202332503U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001550A (en) * | 2012-10-12 | 2013-03-27 | 万洲电气股份有限公司 | Self-excitation compensation soft-starting device for high-power cage motor |
-
2011
- 2011-08-15 CN CN2011202976496U patent/CN202332503U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001550A (en) * | 2012-10-12 | 2013-03-27 | 万洲电气股份有限公司 | Self-excitation compensation soft-starting device for high-power cage motor |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20160815 |