CN204258610U - A kind of device can eliminating frequency converter common-mode voltage - Google Patents
A kind of device can eliminating frequency converter common-mode voltage Download PDFInfo
- Publication number
- CN204258610U CN204258610U CN201420733117.6U CN201420733117U CN204258610U CN 204258610 U CN204258610 U CN 204258610U CN 201420733117 U CN201420733117 U CN 201420733117U CN 204258610 U CN204258610 U CN 204258610U
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- Prior art keywords
- coupling transformer
- mode voltage
- generating module
- waveform generating
- voltage
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- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
The utility model relates to a kind of device can eliminating frequency converter common-mode voltage, comprise inverter, coupling transformer, waveform generating module, dsp controller, induction motor, electric capacity, described waveform generating module is made up of igbt, diode, coupling transformer.The voltage produced by this device adds in the three-phase phase voltage of induction machine, reaches the object eliminating common-mode voltage.This device circuit simplicity of design, and can not work the mischief to motor and production, to whole motor reliability service, there is great practical significance.
Description
Technical field
The utility model belongs to electrical engineering field, refers to a kind of device can eliminating frequency converter common-mode voltage specifically.
Background technology
At present, traditional two level universal frequency converters carrying out vector control do not eliminate common-mode voltage completely by software programming, can only by common mode voltage reduction to original 1/6th, if this part voltage is not suppressed, also certain loss can be caused to production, but, the now not concrete cancellation element for this part voltage, by the measurement to this part voltage waveform, this voltage known is into the square wave in cycle.
Summary of the invention
Goal of the invention:
The utility model provides a kind of device can eliminating frequency converter common-mode voltage, its object is to effectively to suppress the common-mode voltage that motor produces easily in motor driven systems runs, and circuit design is simple, and can not work the mischief to motor and production.
Technical scheme:
The utility model is implemented by the following technical programs:
A kind of device can eliminating frequency converter common-mode voltage, comprise inverter, coupling transformer, waveform generating module, dsp controller, induction motor, it is characterized in that: inverter connects coupling transformer by wire, coupling transformer connects induction motor by wire, waveform generating module is connected with dsp controller, and coupling transformer is a part for waveform generating module.
Described waveform generating module is made up of igbt, diode and coupling transformer, and igbt is connected coupling transformer with after diodes in parallel by wire.
The input of inverter is parallel with electric capacity, and electric capacity is in parallel with the input of waveform generating module.
Advantage and effect:
The utility model solves the problem using two level universal frequency converters of space vector can not eliminate common-mode voltage completely, and the common-mode voltage that can will be able to not eliminate with software programming, is eliminated by this device.And this device suppressing method is simple and safe, can not increase frequency converter burden, also can not produce personal injury.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model, and in figure, 6:1 is the parameter of of transformer itself, namely refers to the voltage change ratio of coupling transformer primary side to secondary side.
Description of reference numerals:
1, inverter, 2, coupling transformer, 3, waveform generating module, 4, dsp controller, 5, induction machine, 6, igbt, 7, diode, 8, electric capacity.
Embodiment
Below in conjunction with accompanying drawing, the utility model is specifically described:
The utility model provides a kind of device can eliminating frequency converter common-mode voltage, be a kind of produce and common-mode voltage equal and opposite in direction, voltage that phase place is contrary device.The voltage produced by this device adds in the three-phase phase voltage of induction machine, reaches the object eliminating common-mode voltage.
A kind of device can eliminating frequency converter common-mode voltage, comprise inverter 1, coupling transformer 2, waveform generating module 3, dsp controller 4, induction motor 5, electric capacity 8, wherein inverter 1 connects coupling transformer 2 by wire, coupling transformer 2 connects induction motor 5 by wire, waveform generating module 3 is connected with dsp controller 4, and coupling transformer 2 is parts of waveform generating module 3.
Described waveform generating module 3 is made up of igbt 6, diode 7 and coupling transformer 2, and igbt 6 is connected coupling transformer 2 with after diode 7 parallel connection by wire.
The input of inverter 1 is parallel with electric capacity 8, is used as voltage source, and play pressure stabilization function, electric capacity 8 is in parallel with the input of waveform generating module 3.
Operation principle of the present utility model is as follows:
When needs are with Driven by inverter induction motor, this device is by introducing this device by the direct voltage of inverter 1 primary side, the primary side of the positive pole access coupling transformer 2 of direct voltage, negative pole accesses the outlet side of this device igbt 6, dsp controller 4 is connected with igbt 6, the make-and-break time of igbt 6 is controlled by DSP Series Controller 4, and then control the change of direct voltage in the polarity of coupling transformer 2, the voltage couples changed by primary side finally by coupling transformer 2 is on the three-phase voltage of induction machine, thus reach the object suppressing voltage.
Above-mentioned dsp controller 4 applies DSPTMS320C2000 family chip, by switching the switching time of dsp controller 4, controlling the pulse of the pin output of dsp controller 4, controlling the make-and-break time of igbt 6 further.
Claims (3)
1. can eliminate the device of frequency converter common-mode voltage for one kind, comprise inverter (1), coupling transformer (2), waveform generating module (3), dsp controller (4), induction motor (5), it is characterized in that: inverter (1) connects coupling transformer (2) by wire, coupling transformer (2) connects induction motor (5) by wire, waveform generating module (3) is connected with dsp controller (4), and coupling transformer (2) is a part for waveform generating module (3).
2. the device can eliminating frequency converter common-mode voltage according to claim 1, it is characterized in that: described waveform generating module (3) is made up of igbt (6), diode (7) and coupling transformer (2), igbt (6) is connected coupling transformer (2) with after diode (7) parallel connection by wire.
3. the device can eliminating frequency converter common-mode voltage according to claim 1, is characterized in that: the input of inverter (1) is parallel with electric capacity (8), and electric capacity (8) is in parallel with the input of waveform generating module (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420733117.6U CN204258610U (en) | 2014-12-01 | 2014-12-01 | A kind of device can eliminating frequency converter common-mode voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420733117.6U CN204258610U (en) | 2014-12-01 | 2014-12-01 | A kind of device can eliminating frequency converter common-mode voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204258610U true CN204258610U (en) | 2015-04-08 |
Family
ID=52962873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420733117.6U Expired - Fee Related CN204258610U (en) | 2014-12-01 | 2014-12-01 | A kind of device can eliminating frequency converter common-mode voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204258610U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410262A (en) * | 2014-12-01 | 2015-03-11 | 沈阳工业大学 | Device capable of eliminating common-mode voltage of frequency converter |
-
2014
- 2014-12-01 CN CN201420733117.6U patent/CN204258610U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410262A (en) * | 2014-12-01 | 2015-03-11 | 沈阳工业大学 | Device capable of eliminating common-mode voltage of frequency converter |
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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 |
Granted publication date: 20150408 Termination date: 20171201 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |