CN2082919U - Easy speed regulation device for three-phase a.c. electric motor - Google Patents
Easy speed regulation device for three-phase a.c. electric motor Download PDFInfo
- Publication number
- CN2082919U CN2082919U CN 90225362 CN90225362U CN2082919U CN 2082919 U CN2082919 U CN 2082919U CN 90225362 CN90225362 CN 90225362 CN 90225362 U CN90225362 U CN 90225362U CN 2082919 U CN2082919 U CN 2082919U
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- CN
- China
- Prior art keywords
- phase
- electric motor
- speed regulation
- regulation device
- alternating current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model relates to a speed regulation device for a three-phase A. C. electric motor, particularly an easy speed regulation device for a three-phase A. C. electric motor. The utility model is composed of a three-phase rectification bridge, a switching circuit and a control circuit. The head ends of three windings of the three-phase A. C. electric motor are connected with a three-phase A. C. power supply; three tail ends of the three windings of the three-phase A. C. electric motor are connected with the input end of the three-phase rectification bridge; the closing and the disconnection of the output end for positive and negative rectification of the three-phase rectification bridge can be controlled by the switching circuit; the average value of the voltage applied on the electric motor can be changed; the goal of speed regulation can be achieved. Because of simple structure of the speed regulation device, the utility model is good for extensive use in industry.
Description
The invention relates to the three phase alternating current motor speed regulating device, particularly the invention of simple type three phase alternating current motor speed regulating device.This device is made up of three-phase commutation bridge, switching circuit and control circuit.
The speed regulating method of three phase alternating current motor has many kinds: tandem control, variable voltage control, rotor winding serial-resistance speed-regulation, change level logarithm a speed governing, frequency control, vector control speed governing and direct Torque Control speed regulating method.Wherein except that vector control and direct Torque Control not really the maturation, other several method is comparative maturity all, the simplest first-elected change level logarithm speed regulating method among them, but this method can only realize the level that has of two or three kind of rotating speed and regulate, application is subjected to certain restriction, other several method structure and control circuit be more complicated but, and be more much bigger than motor itself from cost and volume, so be difficult to promote the use of on a large scale industrial always.
Task of the present invention is to provide a kind of three phase alternating current motor speed regulating device of simple type, and it can overcome traditional shortcoming that AC speed regulator complex structure, volume are bigger than normal and cost is higher effectively.
The object of the present invention is achieved like this: three winding head ends of three phase alternating current motor are connect three-phase alternating-current supply, three winding ends are connected on three inputs of a three-phase commutation bridge, the closed and disconnected that removes to control this rectifier bridge rectification output end with a switching circuit is added in average voltage level on the three phase alternating current motor realizing speed governing with change, realizes that with a control circuit control to switching circuit is to obtain the electric machine speed regulation of requirement.
The present invention is because only need control circuit that switching circuit is realized break-make control, and there is not the specific (special) requirements of phase place aspect, realize easily, and cost and volume also can drop to be suitable for industrial on a large scale in the degree of popularization, so it has good economic and social benefit.
Accompanying drawing has provided one embodiment of the present of invention.
Fig. 1 is a circuit structure diagram of the present invention.D
1-6Constitute three-phase commutation bridge (1), drive circuit 1204, R
3-6, T
1-2, D
7, R
1And C
1Constitute switching circuit (2), CD4046, W
1, C
2, R
2, W
2, C
3Constitute control circuit (3), L with 74LS123
1-3Three windings for three phase alternating current motor.Change W
1Can regulate the output frequency of CD4046,74LS123 constitutes the monostable pulse width regulating circuit, and it carries out pulse-width regulated for the pulse of CD4046, regulates W
2Can change pulsewidth, so W
1And W
2Determined jointly control circuit (3) output pulse average voltage level, the break-make of going to control switch circuit (2) with this output pulse, when pulse is high level, T
2Conducting makes T by the photoelectrical coupler in 1204
1Conducting, the rectifier terminal closure of three-phase commutation bridge, three-phase voltage all has been added on the motor, the motor rotation, when pulse is low level, T
1And T
2All not conductings, electric moter voltage are zero, D
7, R
1And C
1At T
1The break-make of pipe shields in switching.Regulate W
1And W
2Just can change the average voltage level that is added on the motor, thereby realize adjusting requirement.
Embodiment: W
1-2: 100K, C
1: 1, C
2-3: 0.01, R
2: 100K, R
3: 470, R
4: 5K, R
5: 0.5, R
6: 3.9, T
2: 9031, T
1: SQ50A100, can realize the rotational speed regulation to the three phase alternating current motor of 0.75KW.
Claims (2)
1, three phase alternating current motor speed regulating device, simple type three phase alternating current motor speed regulating device particularly, this device is made up of three-phase commutation bridge (1), switching circuit (2) and control circuit (3), it is characterized in that two same switching circuits of rectification output end (2) of three-phase commutation bridge link.
2, AC speed regulator according to claim 1, it is three inputs that are connected on three-phase commutation bridge (1) that three windings that it is characterized in that three phase alternating current motor are not held.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90225362 CN2082919U (en) | 1990-12-05 | 1990-12-05 | Easy speed regulation device for three-phase a.c. electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90225362 CN2082919U (en) | 1990-12-05 | 1990-12-05 | Easy speed regulation device for three-phase a.c. electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2082919U true CN2082919U (en) | 1991-08-14 |
Family
ID=4902804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90225362 Withdrawn CN2082919U (en) | 1990-12-05 | 1990-12-05 | Easy speed regulation device for three-phase a.c. electric motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2082919U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045022A (en) * | 2009-11-16 | 2011-05-04 | 孙宏斌 | Stepless speed regulating circuit of single-phase alternating-current motor |
-
1990
- 1990-12-05 CN CN 90225362 patent/CN2082919U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045022A (en) * | 2009-11-16 | 2011-05-04 | 孙宏斌 | Stepless speed regulating circuit of single-phase alternating-current motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |