CN201699633U - Three-phase asynchronous frequency-conversion starting device based on current control - Google Patents
Three-phase asynchronous frequency-conversion starting device based on current control Download PDFInfo
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- CN201699633U CN201699633U CN201020247256XU CN201020247256U CN201699633U CN 201699633 U CN201699633 U CN 201699633U CN 201020247256X U CN201020247256X U CN 201020247256XU CN 201020247256 U CN201020247256 U CN 201020247256U CN 201699633 U CN201699633 U CN 201699633U
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- microprocessor
- current control
- device based
- frequency converter
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Abstract
The utility model discloses a three-phase asynchronous frequency-conversion starting device based on current control. The utility model is characterized in that a current transformer used for detecting phase current is connected with one input terminal of a microprocessor through an A/D converter, a speed transducer is connected with the other input terminal of the microprocessor, and the output terminal of the microprocessor is connected with a transducer. The three-phase asynchronous frequency-conversion starting device based on current control can harmonize starting time and starting current and ensure the starting process of the motor to be stable and quick.
Description
Technical field
The utility model belongs to Motor Control Field, relates to a kind of threephase asynchronous machine static frequency converter based on Current Control.
Background technology
For threephase asynchronous machine, existing Starting mode is directly to start or soft start, when directly starting,, easily electrical network is caused greater impact because starting current is excessive, also the life-span of this book of motor is caused harmful effect, should not adopt, and soft-start mode, though starting current is not very high, but start-up time is long, therefore requires the occasion of weak point start-up time to use at some.
The utility model content
The utility model wants the technical solution problem to provide a kind of threephase asynchronous machine static frequency converter based on Current Control, should can coordinate start-up time and starting current based on the threephase asynchronous machine static frequency converter of Current Control, make that the electric motor starting process was steady, start-up time is fast.
The utility model is to solve the problems of the technologies described above the technical scheme that is adopted to be:
A kind of threephase asynchronous machine static frequency converter based on Current Control, the current transformer that is used to detect phase current joins through an input of A/D converter and microprocessor, another input of speed probe and microprocessor joins, and the output and the frequency converter of microprocessor join.
Described microprocessor adopts PLC or single-chip microcomputer.
The beneficial effects of the utility model:
Threephase asynchronous machine static frequency converter based on Current Control of the present utility model, motor the startup stage, adopt the starting current of current transformer monitoring motor, by the output frequency and the magnitude of voltage of control of conversion device, make motor approach the current start that motor can bear, like this, it is big to make that neither the motor feels hot, the damage motor can not cause big impact to electrical network, can realize the startup of motor faster yet.Therefore, the employing threephase asynchronous machine static frequency converter start-up course based on Current Control of the present utility model is steady, start-up time is fast.
Description of drawings
Fig. 1 is the structured flowchart of the threephase asynchronous machine static frequency converter based on Current Control of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Embodiment 1:
As shown in Figure 1, a kind of threephase asynchronous machine static frequency converter based on Current Control, the current transformer that is used to detect phase current joins through an input of A/D converter and microprocessor, another input of speed probe and microprocessor joins, and the output and the frequency converter of microprocessor join.Microprocessor adopts the MC9S12D64 chip of Motorola Inc..
The course of work is described: during electric motor starting, electric current sharply rises, given current value is 2I, I is the rated current of motor, the current value that current transformer detects converts digital signal output end to microprocessor through A/D converter, microprocessor according to this digital signal (being sampled value) calculate current current effective value and should current current effective value and given current value ratio, the difference of given current value and current current value is as the input of PID controller, PID control is realized by the program in the microprocessor, be prior art, PID controller output frequency value and magnitude of voltage, owing to increase the increase that voltage helps torque, help rotating speed and reach rated speed as early as possible, also helping electric current increases, and increasing frequency also directly influences rotating speed.Current transformer detects current value as negative feedback, therefore, has a Constant Current Control System based on Current Negative Three-Point Capacitance and PID control in the present embodiment in fact.Simultaneously, microprocessor is also by the speed probe increase of monitoring rotation speed always, when rotating speed reaches rated speed or approach rated speed (as 0.9 times of rated speed), stop the work of PID control, promptly finish the Current Control of start-up course, machine operation is in normal running status (being non-started state).Therefore, adopt the threephase asynchronous machine static frequency converter based on Current Control of present embodiment to help motor in start-up course, its starting current can not surpass default current value, can finish the start-up course of motor as early as possible yet.
Claims (2)
1. threephase asynchronous machine static frequency converter based on Current Control, it is characterized in that, the current transformer that is used to detect phase current joins through an input of A/D converter and microprocessor, another input of speed probe and microprocessor joins, and the output and the frequency converter of microprocessor join.
2. the threephase asynchronous machine static frequency converter based on Current Control according to claim 1 is characterized in that, described microprocessor adopts PLC or single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020247256XU CN201699633U (en) | 2010-07-04 | 2010-07-04 | Three-phase asynchronous frequency-conversion starting device based on current control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020247256XU CN201699633U (en) | 2010-07-04 | 2010-07-04 | Three-phase asynchronous frequency-conversion starting device based on current control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201699633U true CN201699633U (en) | 2011-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020247256XU Expired - Fee Related CN201699633U (en) | 2010-07-04 | 2010-07-04 | Three-phase asynchronous frequency-conversion starting device based on current control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201699633U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645252A (en) * | 2016-07-20 | 2018-01-30 | 巴工业株式会社 | The startup method and decanter type centrifugal separating device of three phase induction motor |
| CN109243285A (en) * | 2018-11-12 | 2019-01-18 | 湖北文理学院 | A kind of motor speed control experiment porch and method based on rapid control prototyping |
-
2010
- 2010-07-04 CN CN201020247256XU patent/CN201699633U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645252A (en) * | 2016-07-20 | 2018-01-30 | 巴工业株式会社 | The startup method and decanter type centrifugal separating device of three phase induction motor |
| CN109243285A (en) * | 2018-11-12 | 2019-01-18 | 湖北文理学院 | A kind of motor speed control experiment porch and method based on rapid control prototyping |
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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: 20110105 Termination date: 20110704 |