CN2679913Y - Three-phase a.c. speed variable dynamo - Google Patents
Three-phase a.c. speed variable dynamo Download PDFInfo
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- CN2679913Y CN2679913Y CN 200420032607 CN200420032607U CN2679913Y CN 2679913 Y CN2679913 Y CN 2679913Y CN 200420032607 CN200420032607 CN 200420032607 CN 200420032607 U CN200420032607 U CN 200420032607U CN 2679913 Y CN2679913 Y CN 2679913Y
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- phase
- dynamo
- alternating current
- motor
- electromotive force
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Abstract
The three-phase a. c. speed variable dynamo of the utility model relates to a technique of dynamo speed governing in the field of dynamo and electro-engineering. The three-phase a. c. speed variable dynamo is composed of a main body of the a. c. dynamo and a reversed phase electromotive force generator with variable direct current voltage, variable output voltage, and variable output phase which is connected with one end of three stator windings of the main body of the a. c. dynamo. The former speed governing method of taking out energy from a dynamo to an electric network is changed to the mode of altering ideal no-load angular speed by a reversed phase electromotive force applied to the dynamo to balance out part of energy of the dynamo and control magnitude of direct current voltage. Compared with prior art, a notching section of taking out energy from the dynamo to the electric network is removed, energy is saved, and various bad effects on the electric network is avoided. The three-phase a. c. speed variable dynamo which is of simpler structure and is easier to produce and manufacture reduces manufacture cost and operation cost.
Description
Technical field
The utility model relates to the electric machine speed regulation technology in the electric machinery and electrotechnology field.
Background technology
Motor is the conversion equipment of a kind of " mechanical energy-electric energy-mechanical energy ", and they mostly have invertibity.Mainly contain synchronous machine and asynchronous machine in present motor, they all can be used as in generator (" mechanical energy-electric energy ") or motor (" electric energy-mechanical energy ").When they when the generator, the frequency of their output all is directly proportional with their rotating speed, in the time of therefore will exporting the alternating current of fixed frequency, their rotation speed change all must be fixed in the small range, and no matter their load is light or heavy.Usually the energy of these electromechanical energy conversion device consumption is to be directly proportional with their rotating speed, so no matter to be hydroelectric power generation, thermal power generation, and wind power generation, or fuel oil generating all have sizable energy loss phenomenon.When motor is used as motor, often require speed governing.At present available speed regulating method is a lot, and as frequency control, the shortcoming of this frequency control is the line construction complexity, and when requiring high performance control is arranged, cost is higher; Particularly to powerful device, cost performance is too undesirable.Also can adopt inner feedback speed-regulating, variable voltage control, water resistance speed governing or fluid-flywheel clutch, electromagnetic speed regulator to carry out speed governing to asynchronous machine.This class speed adjusting technique all belongs to the poor efficiency speed governing.As inner feedback speed-regulating, its working method is to take out unnecessary energy to come speed governing from motor, and the energy of taking-up returns to electrical network again.As Chinese utility model patent CN2244266 disclosed " cage induction motor cascade speed regulator ", exactly the stator winding of cage induction motor is linked to each other with the convertor assembly that is made of three-phase commutation bridge, smoothing reactor, three phase inverter bridge and transformer and constitute, feed back to power supply grid through convertor assembly and realize speed governing by regulating the trigger angle of three phase inverter bridge, make the unnecessary energy that is input to motor.There are many problems in this class buncher in application, big to Disturbance in Power Net when returning to electrical network as the energy that takes out, and causes harmonic pollution etc.In addition, take out grade link of changing that energy returns electrical network again and also caused energy waste.
The utility model content
The purpose of this utility model is the above-mentioned shortcoming that overcomes prior art, provides a kind of simple in structure, efficiency height, the three-phase alternating current variable speed electric motors, particularly that cost performance is good.
The purpose of this utility model is by applying a direct voltage and this technological means of anti-phase electromotive force realizes to motor.
This three-phase alternating current variable speed electric motors, particularly is constituted by an alternating current machine body with the anti-phase electromotive force generator of direct voltage three-phase variable, that output voltage is variable, output phase is variable that an end of three stator winding of alternating current machine body joins.
The operation principle of this three-phase alternating current variable speed electric motors, particularly is:
We know that the desirable unloaded angular speed that changes motor just can make motor not only can make motor but also can make generator and use.When the desirable unloaded angular speed of motor is higher than the motor actual angular speed, input electric energy outputting machine tool energy, motor becomes motor.When machine operation when the unloaded angular speed of ideal is lower than the motor actual angular speed, input mechanical energy output electric energy, motor becomes generator.This three-phase alternating current variable speed electric motors, particularly obtains energy and makes it work for anti-phase electromotive force generator energy delivery from electrical network, when electric motor state, anti-phase electromotive force generator produces an anti-phase electromotive force opposite, adjustable size of the voltage with motor and imposes on motor, balance out a part of electrical network and impose on the energy of motor and reach the electric current of motor is regulated, regulate anti-phase electromotive force dc terminal voltage and be the desirable unloaded angular speed of scalable motor and realize the purpose of speed governing.When machine operation during at the generator state, the difference of regulating desirable unloaded angular speed of motor and actual angular speed by anti-phase electromotive force generator is the size of scalable energy output.Because motor stator winding is connected on the AC network upper frequency all the time and does not change, no matter guaranteed by the regulation and control of anti-phase electromotive force generator how rotating speed changes, and the frequency of stator winding remains constant, has so just constituted vscf generator.Change the phase place of the anti-phase electromotive force of three-phase, can change the power factor (PF) of motor, improve the operational efficiency of motor.
This three-phase alternating current variable speed electric motors, particularly can be made squirrel cage asynchronous motor or synchronous machine.Motor to this class formation, its alternating current machine body is squirrel cage asynchronous motor or synchronous motor body, anti-phase electromotive force generator is made of three-phase inverter, after the end (x), (y), (z) that is about to former three stator winding that link together of existing squirrel cage asynchronous motor or synchronous machine disconnects respectively with corresponding one by one being connected of three incoming ends (U), (V), (W) of three-phase inverter, reconstitute the electric pathway of stator winding.By regulating the switching sequence and the time of three-phase inverter, promptly change the pulse duration of the voltage of its output, the size that then can make the size of the phase angle of the current/voltage on the stator winding and current/voltage and impose on the charging voltage of the electric capacity in the three-phase inverter all changes, utilize the change of inverter phase difference, then can be to discharge again after this electric capacity charging, the size of control direct voltage can change desirable unloaded angular speed indirectly, then make inverter produce an anti-phase electromotive force during capacitor discharge and impose on motor windings, balance out the energy that a part of electrical network puts on motor thereby the size of controlling anti-phase electromotive force is the voltage at may command stator winding two ends.
This three-phase alternating current variable speed electric motors, particularly also can be made the wound rotor asynchronous machine.Motor to this version, its alternating current machine body is a wound rotor asynchronous machine body, anti-phase electromotive force generator is made of a three-phase inverter and a rectifier, the end (x) of each winding of three stator winding of described motor body, (y), (z) respectively with corresponding one by one being connected of three incoming ends (U), (V), (W) of three-phase inverter, the input of described rectifier respectively with three rotor ring (A of alternating current machine
1), (A
2), (A
3) the corresponding connection, the output of rectifier and the dc terminal of inverter are joined.Induced electromotive force during work in the rotor winding is by the slip ring input rectifier, and rectifier is sent into three-phase inverter after AC rectification is become direct current, and inverter produces an anti-phase electromotive force and imposes on motor stator winding when dc inversion is become alternating current.Also can constitute common asynchronous moter behind the rotor winding short circuit with the wound rotor asynchronous machine, can realize the purpose of speed governing equally.
For high-voltage motor, as 6KV, 10KV motor, described anti-phase electromotive force generator can be made of a three-phase transformer and a three-phase inverter, and the secondary of transformer connects three stator winding respectively, and the former limit of transformer connects three incoming ends of inverter respectively.By transformer finish between the two connection and the coupling of voltage.The benefit of doing like this is to utilize the inverter of low-voltage to control high-voltage motor, saves cost greatly.
The utility model takes out mode of speed regulation that energy returns electrical network from motor and changes into and apply an anti-phase electromotive force to motor and reach speed governing with the working method that the size of the energy of offsetting a part of motor and control direct voltage can change desirable unloaded angular speed indirectly original, lacked grade link of changing of returning electrical network from motor taking-up energy again than original scheme, not only saved the energy, also avoided various harmful effects electrical network.More simple from structure, making is more prone to, thereby manufacturing cost and use cost reduces greatly, and cost performance improves greatly.When particularly using,, thereby can remove original very complicated and expensive converter plant from partly because the frequency of the electricity that is sent can not be subjected to the influence of its rotating speed as generator.Utilize this characteristics, in thermal power generation, hydroelectric power generation, can come the rotating speed of regulator generator, reach purpose of energy saving according to the size of load.When being used for wind power generation, owing to enlarged the range of speeds, thereby can improve the energy output of motor.
Do further and to describe in detail below in conjunction with the embodiment content of the present utility model of opposing, but content of the present utility model is not limited only to content related among the embodiment.
Description of drawings
Fig. 1 is the structural representation of embodiment 1 of the present utility model
Fig. 2 is the structural representation of embodiment 2
Fig. 3 is the structural representation of embodiment 3
Fig. 4 is the connection schematic diagram of the transformer of another kind of form
Fig. 5 is the connection schematic diagram that adopts auto-type transformer
Embodiment
Embodiment 1:
What specifically provide in the present embodiment as shown in Figure 1, is the version of squirrel cage asynchronous motor.Its alternating current machine body 1 is squirrel cage asynchronous motor or synchronous motor body, anti-phase electromotive force generator 2 is made of three-phase inverter, specific practice be after terminal x, the y of former three stator winding that link together of existing squirrel cage asynchronous motor or synchronous machine, z are disconnected respectively with corresponding one by one being connected of three incoming end U, V, W of three-phase inverter.Three-phase inverter 2 can adopt the voltage-type three-phase inverter of the electric Manufacturing Co., Ltd of the good spirit in Chengdu development.AC power from electrical network is defeated by inverter and the charging of the capacitor C in inverter by stator winding, and the discharge of capacitor C constitutes an anti-phase electromotive force and imposes on motor body.
Embodiment 2:
Referring to Fig. 2, what specifically provide in the present embodiment is the version of wound rotor asynchronous machine.Its alternating current machine body 3 is a wound rotor asynchronous machine body, anti-phase electromotive force generator is made of a three-phase inverter 5 and a rectifier 4, terminal x, the y of each winding of three stator winding of motor body 3, z respectively with corresponding one by one being connected of three incoming end U, V, W of three-phase inverter 5, the input of rectifier 4 respectively with three rotor ring A of alternating current machine
1, A
2, A
3The corresponding connection, the output of rectifier and the dc terminal of inverter are joined.
Induced electromotive force during work in the rotor winding is by the slip ring input rectifier, and rectifier is sent into three-phase inverter after AC rectification is become direct current, and inverter produces an anti-phase electromotive force and imposes on motor stator winding when dc inversion is become alternating current.
Embodiment 3:
Referring to Fig. 3, the difference of present embodiment and preceding embodiment is to connect with a three-phase transformer 6 between three-phase inverter and three stator winding.Finish voltage matches between the two when realizing connection between three-phase inverter and three stator winding by transformer.Be that described anti-phase electromotive force generator is made of a three-phase transformer 6 and a three-phase inverter 7, the secondary of transformer meets terminal x, y, the z of three stator winding respectively, and the former limit of transformer meets three incoming end U, V, the W of inverter respectively.
Three incoming end U, V of three-phase inverter, W also can be connected on front end X, Y, the Z of three stator winding by transformer, referring to Fig. 4.
Transformer can also adopt auto-type transformer 8, referring to Fig. 5.
Claims (4)
1, three-phase alternating current variable speed electric motors, particularly is characterized in that described three-phase alternating current variable speed electric motors, particularly is constituted by an alternating current machine body with direct voltage anti-phase electromotive force generator variable, that output voltage is variable, output phase is variable that an end of three stator winding of alternating current machine body joins.
2, three-phase alternating current variable speed electric motors, particularly as claimed in claim 1, it is characterized in that described alternating current machine body is squirrel cage asynchronous motor or synchronous motor body, described anti-phase electromotive force generator is made of three-phase inverter, the end (x) of each winding of three stator winding of described motor body, (y), (z) respectively with corresponding one by one being connected of three incoming ends (U), (V), (W) of three-phase inverter.
3, three-phase alternating current variable speed electric motors, particularly as claimed in claim 1, it is characterized in that described alternating current machine body is a wound rotor asynchronous machine body, described anti-phase electromotive force generator is made of a three-phase inverter and a rectifier, the end (x) of each winding of three stator winding of described motor body, (y), (z) respectively with corresponding one by one being connected of three incoming ends (U), (V), (W) of three-phase inverter, the input of described rectifier respectively with three rotor ring (A of alternating current machine
1), (A
2), (A
3) the corresponding connection, the output of rectifier and the dc terminal of inverter are joined.
4, three-phase alternating current variable speed electric motors, particularly as claimed in claim 1, it is characterized in that described anti-phase electromotive force generator is made of a three-phase transformer and a three-phase inverter, the secondary of transformer connects three stator winding respectively, and the former limit of transformer connects three incoming ends of inverter respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420032607 CN2679913Y (en) | 2004-01-18 | 2004-01-18 | Three-phase a.c. speed variable dynamo |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420032607 CN2679913Y (en) | 2004-01-18 | 2004-01-18 | Three-phase a.c. speed variable dynamo |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2679913Y true CN2679913Y (en) | 2005-02-16 |
Family
ID=34583694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420032607 Expired - Fee Related CN2679913Y (en) | 2004-01-18 | 2004-01-18 | Three-phase a.c. speed variable dynamo |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2679913Y (en) |
-
2004
- 2004-01-18 CN CN 200420032607 patent/CN2679913Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050216 Termination date: 20100219 |