CN1022658C - Adjustable-speed device for wirewound alternating-current motor - Google Patents
Adjustable-speed device for wirewound alternating-current motor Download PDFInfo
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- CN1022658C CN1022658C CN 92103817 CN92103817A CN1022658C CN 1022658 C CN1022658 C CN 1022658C CN 92103817 CN92103817 CN 92103817 CN 92103817 A CN92103817 A CN 92103817A CN 1022658 C CN1022658 C CN 1022658C
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- capacitor
- motor
- rectifier
- electronic switch
- adjustable
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Abstract
The present invention discloses a speed adjusting device for a wire winding type AC motor, which causes the inductance electrical potential of a motor to charge a capacitor through a two-stage inductor with the same core after rectification. The capacitor and a section of inductor connected with the capacitor in series are connected with an electronic switch in parallel. By adjusting the on-off time and frequency of the electronic switch and the charge and discharge of the capacitor, the speed control of a motor is realized. The present invention has the advantages of improving the power factor, avoiding the pollution of a power network, etc.
Description
The present invention relates to a kind of speed regulating device of wound type AC motor, particularly a kind of device of realizing speed regualtion of AC motor by the interior feed gesture of regulating rotor.
In the speed adjusting technique of existing wound type AC motor, the SCR cascade speed control device is used widely, but because its power factor low (generally about 0.4), the inverter current of feedback electrical network contains the contaminative harmonic wave of suitable composition again.In addition, the cost of device is higher, and all these technological deficiencies make it be restricted aspect higher economic benefit and the social benefit realizing.
Chinese patent 87107830 once at inverter direct current one side of SCR cascade speed control device electronic switch in parallel, carried out pulse-width modulation with it to inverter voltage, so as to regulating rotating speed of motor.This scheme has obtained and has improved power factor and the part effect that reduces the harmonic current influence.But the aforementioned inherent shortcoming that relates to tandem control, it still difficulty all avoid, particularly almost do not improve aspect the apparatus cost reducing.
The objective of the invention is to overcome the major defect of above-mentioned existing tandem control technology, realize a kind of speed regulating device with wound type AC motor of higher practical value.
The technical measures that realize the foregoing invention purpose are, the speed regulating device of wound type AC motor of the present invention are by a rectifier (3), two sections inductors (4 with core, 5), the electronic switch (7) that a capacitor (6) and make-and-break time and frequency can be regulated and control is formed, wherein the input of rectifier is as the incoming end (2) of motor (1) wound-rotor induction gesture, an output of rectifier links to each other with an electrode of capacitor, another output of rectifier is connected with a end with core inductor (4), the other end with core inductor (5) links to each other with another electrode of capacitor, goes up and follow electronic switch at one section inductance (5) of capacitor and serial connection thereof.
During use, speed regulating device of the present invention insert induced electromotive force by the motor wound rotor, when electronic switch disconnects, behind rectifier rectification by charging to capacitor with the core inductor, finally on capacitor, produce relative with induced potential, as to reach an extreme value direct current back-emf, the interior non-inductive electric current of rotor winding this moment, the rotating speed of motor is zero.When the electronic switch admittance, the inductor and closed switch discharge of capacitor by being right after, the direct current back-emf until thereon is zero, and at this moment rotor winding is closed, and motor turns round with rated speed.In charge and discharge process, induced potential is all arranged on the core inductor at two sections.When the switching frequency of regulating electronic switch within the specific limits and make-and-break time ratio, the back-emf on the capacitor is regulated between the extreme value zero, thereby realized the running of motor between rated speed and zero rotating speed.
Ac motor speed control device of the present invention does not adopt the phase control method of SCR cascade speed control, has avoided the factor that the system power factor is reduced.It is to rely on the back-emf that rotor autonomous induction electromotive force is produced to carry out interior feedback to regulate the realization speed governing, thereby does not also have the problem to electrical network feedback contaminative harmonic wave.Compare with the SCR cascade speed control device, speed regulating device of the present invention parts such as the SCR inverter of price comparison costliness and contravariant transformer, thereby also have the effect that reduces product cost and simplified structure.
Below in conjunction with drawings and Examples the present invention and application thereof are described further.
Fig. 1 is the schematic diagram of wound type AC motor speed regulating device of the present invention.
Fig. 2 is the schematic diagram that one embodiment of the present invention and speed governing are used.
1 is motor among the figure, 2 line ends for the motor rotor coiling, and 3 is rectifier, 4 and 5 is two sections inductors with core, 6 is capacitor, and 7 is electronic switch, and 8 is square-wave generator, 9 is power switch transistor, 10 is potentiometer, and 11 is reference voltage, and 12 is earth terminal, 13 and 14 is the occupation efficiency adjustable side, and 15 is square wave.
One embodiment of the present invention is made electronic switch with the power switch transistor (9) of a squarer control.After being elected to the pulse repetition frequency that mixes up squarer output, just rely on the occupation efficiency of regulating the rectangular pulse (15) of transporting to transistor (9) base stage to come the transistorized make-and-break time ratio of by-pass cock, thus the rotating speed of adjusting motor.Occupation efficiency T/t when rectangular pulse (15)
dWhen 1 transferred to ∞, the rotating speed of motor transferred to zero from rated speed.Square-wave generator (8) is provided with two occupation efficiency adjustable sides (13 and 14), wherein an end (14) is connected on the adjustable end of potentiometer (10) of assigned references voltage (11), by manual adjustments, when adjustable end (14) current potential of potentiometer (10) timing from low to high, occupation efficiency reduces, and the rotating speed of motor increases.Another occupation efficiency adjustable side (13) links to each other with the positive output end of rectifier (3), realizes the closed loop regulation and control, keeps rotating speed steady.
Claims (3)
1, a kind of by the rectifier that can insert motor wound-rotor induction gesture, the speed regulating device of the wound type AC motor that components such as the electronic switch of make-and-break time and frequency adjustable and inductor are formed, it is characterized by, its composition also comprises a capacitor, inductor during it is formed is two sections inductors with core, an output of its rectifier links to each other with an electrode of capacitor, another output of rectifier is connected with a end with the core inductor, the other end with the core inductor links to each other with another electrode that is capacitor, also follows electronic switch on one section inductance of capacitor and serial connection thereof.
2, according to the speed regulating device of the described alternating current motor of claim 1, it is characterized by, the electronic switch that a described make-and-break time and frequency can be regulated and control is exactly a power switch transistor by squarer control.
3, according to the speed regulating device of the described alternating current motor of claim 2, it is characterized by: the squarer of described power controlling switching transistor has two occupation efficiency adjustable sides, one of them is connected with the adjustable end of potentiometer, and another links to each other with the positive output end of described rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92103817 CN1022658C (en) | 1992-05-29 | 1992-05-29 | Adjustable-speed device for wirewound alternating-current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92103817 CN1022658C (en) | 1992-05-29 | 1992-05-29 | Adjustable-speed device for wirewound alternating-current motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1065958A CN1065958A (en) | 1992-11-04 |
| CN1022658C true CN1022658C (en) | 1993-11-03 |
Family
ID=4940473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92103817 Expired - Fee Related CN1022658C (en) | 1992-05-29 | 1992-05-29 | Adjustable-speed device for wirewound alternating-current motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022658C (en) |
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1992
- 1992-05-29 CN CN 92103817 patent/CN1022658C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1065958A (en) | 1992-11-04 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |