CN103633893A - Single-damping mixed star connection vibration-free braking frequency conversion apparatus - Google Patents
Single-damping mixed star connection vibration-free braking frequency conversion apparatus Download PDFInfo
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- CN103633893A CN103633893A CN201210307004.5A CN201210307004A CN103633893A CN 103633893 A CN103633893 A CN 103633893A CN 201210307004 A CN201210307004 A CN 201210307004A CN 103633893 A CN103633893 A CN 103633893A
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- 238000013016 damping Methods 0.000 title claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 title abstract description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 abstract description 5
- 230000000630 rising effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
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Abstract
Disclosed in the utility model is a single-damping mixed star connection vibration-free braking frequency conversion apparatus comprising a frequency converter having a master control circuit. The frequency conversion apparatus also includes a damping circuit and a solenoid valve; three output terminals of the damping circuit are connected in series with the solenoid valve and then are connected with three output terminals of an inverter circuit correspondingly; and a control input terminal of the solenoid valve is connected with a damping control signal output terminal of the master control circuit. The damping circuit includes three resistors and three capacitors; each resistor and each capacitor are connected in parallel to form a damping unit. And the damping circuit also includes the three damping units; one ends of the three damping units are mutually connected; and the other ends of the three damping units respectively serve as three output terminals of the damping circuit. According to the invention, the resistors and the capacitors in the damping circuit are used for consuming the energy of the output terminal, that is, a load terminal, of the inverter circuit, thereby achieving objects of being free of vibration, noise, and temperature rising braking. Therefore, the provided apparatus is an upgraded product of the traditional stepless speed-adjusting frequency converter.
Description
Technical field
The present invention relates to a kind of converter plant, relate in particular to a kind of on traditional frequency conversion device basis improved single damping mixing Y-connection without the brake variable-frequency device that shakes.
Background technology
Frequency converter has purposes widely at industrial control field, tandem type high voltage converter particularly, especially industrial to heavy-duty motor control, the visual plant of speed governing, frequency converter and motor have formed frequency conversion speed-adjusting system.
The application scenario of many transducer drive motor all needs to have braking function, i.e. quick shutdown and the fast ability of reduction of speed.This wherein also comprises the quick shutdown application scenario of blower fan, pump class.A lot of steel mills, in order to enhance productivity, have proposed very high requirement to the stopping power of frequency converter.Such as work period of steel mill refining one heat steel is 35 minutes, each work period, all require frequency conversion speed-adjusting system, at 4-l0 dragging motor within second, if frequency converter does not have stopping power, at least need the time of 6 minutes just can complete reduction of speed.The occasion that possesses frequent braking function for this needs, is used the frequency converter without fast braking ability obviously can affect production efficiency.
At present industrial applications widely accepted braking method have:
1, on transducer power unit DC bus, increase brake unit: this method can make shorten down time, depends on the size of brake unit the fastest attainable down time.But for tandem type high voltage converter, power cell quantity is many, each unit increases a brake unit, and not only cost increases greatly, and controls very complicated.
2, DC injection braking: this kind of method to input direct-current on motor stator, energy consumption, in motor, can not be increased to the cost of frequency converter, but brake torque and dynamic characteristics is all bad by software, and the rotating speed of motor in reduction of speed process is also difficult to estimate.If DC injection braking needs very high brake torque, require frequency converter to have very strong conveyance capacity, otherwise easily cause frequency converter overcurrent tripping.
3, harmonic braking: this method increases harmonic current by software, consumes the energy in rotor and load by increasing the loss of electric machine.This method can cause that the serious heating of motor and noise increase and high torque (HT) ripple, and this is disadvantage.
4, large-slip braking: when induction motor is during by prime mover driven, due to the moment of inertia of load, the speed of rotor is greater than the synchronizing speed of rotation air-gap field, and now motor shows as induction generator, and slippage is in this case negative value.Under specific slippage condition, the parameter of electric machine is certain, has such working point, and it is all converted into the mechanical energy obtaining from prime mover the heat energy of induction electric machine stator and rotor, does not have energy to return to power supply.Therefore, this method is very suitable for the brake application of voltage source inverter drive motors.But, just because of energy all consumes at motor internal, so motor can serious heating, easily cause the gravity flow bus overvoltage of transducer power unit and the mouth that trips
In sum, the shortcoming of the braking technology of traditional frequency conversion device is: control complexity, motor temperature, noise and serious vibration increase, the easy overvoltage of frequency converter or overcurrent tripping in braking procedure.
Summary of the invention
Object of the present invention with regard to be to provide in order to address the above problem a kind of on traditional frequency conversion device basis improved single damping mixing Y-connection without the brake variable-frequency device that shakes.
The present invention is achieved through the following technical solutions above-mentioned purpose:
Single damping mixing Y-connection of the present invention comprises frequency converter without the brake variable-frequency device that shakes, and described frequency converter comprises power circuit, rectification circuit, inverter circuit, governor circuit, drive circuit, voltage sampling circuit and current sampling circuit; Described single damping mixing Y-connection also comprises antihunt circuit and electromagnetically operated valve without the brake variable-frequency device that shakes, the corresponding connection of three outputs with described inverter circuit of connecting after described electromagnetically operated valve of three outputs of described antihunt circuit, the control input end of described electromagnetically operated valve is connected with the damping control signal output of described governor circuit; Described antihunt circuit comprises three resistance and three electric capacity, described in each, resistance and a described Capacitance parallel connection are connected to form a damping unit, described antihunt circuit comprises three damping units, one end of three described damping units interconnects, and the other end of three described damping units is respectively three outputs of described antihunt circuit.
When needs are braked, governor circuit is to electromagnetically operated valve output drive signal, solenoid closure, connect three outputs of antihunt circuit and three outputs of inverter circuit, three resistance and three load-side that electric capacity drops into inverter circuit of antihunt circuit, depletion load end energy, makes load end motor realize fast braking.
Beneficial effect of the present invention is:
The present invention utilizes energy consumption that resistance in antihunt circuit and electric capacity are load end to the output of inverter circuit to reach the object of braking, friction in braking procedure, noiselessness, without overvoltage, without overcurrent, without temperature rise, and by governor circuit, realize the automatic control of braking, be the upgrading products of traditional stepless time adjustment frequency converter.
Accompanying drawing explanation
Fig. 1 is that single damping mixing Y-connection of the present invention is without the electrical block diagram of the brake variable-frequency device that shakes;
Fig. 2 is the structural representation of antihunt circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As depicted in figs. 1 and 2, single damping mixing Y-connection of the present invention comprises frequency converter without the brake variable-frequency device that shakes, described frequency converter comprises power circuit, rectification circuit, inverter circuit, governor circuit, drive circuit, voltage sampling circuit and current sampling circuit, the input of rectification circuit connects three live wire R of three phase mains, S, T, the output of rectification circuit is connected with the input of inverter circuit, the three-phase power input end U of the three-phase output end of inverter circuit and load motor M, V, W connects, voltage sampling circuit and current sampling circuit are sampled and are transferred to governor circuit the electric current of the voltage of the input of inverter circuit and output respectively, governor circuit is controlled inverter circuit by drive circuit, the input of power circuit connects wherein two live wires in three phase mains, the output of power circuit is connected with the power input of governor circuit, described single damping mixing Y-connection also comprises antihunt circuit and electromagnetically operated valve without the brake variable-frequency device that shakes, the corresponding connection of three-phase power input end U, V, W that is load motor M with three outputs of inverter circuit after three output terminals A of antihunt circuit, B, C series electrical magnet valve, the control input end of electromagnetically operated valve is connected with the damping control signal output of governor circuit, antihunt circuit comprises three resistance R 1, R2, R3 and three capacitor C 1, C2, C3, each resistance and a Capacitance parallel connection are connected to form a damping unit, antihunt circuit comprises three damping units, one end of three damping units interconnects, and the other end of three damping units is respectively three output terminals A, B, the C of antihunt circuit.
As depicted in figs. 1 and 2, when needs are braked, governor circuit is to electromagnetically operated valve output drive signal, solenoid closure, three-phase power input end U, V, W that three outputs connecting three output terminals A, B, C and inverter circuits of antihunt circuit are load motor M, three resistance R 1 of antihunt circuit, R2, R3 and three load-side that capacitor C 1, C2, C3 drop into inverter circuit, depletion load end motor M energy, makes load end motor M realize fast braking.
Claims (1)
1. single damping mixing Y-connection, without the brake variable-frequency device that shakes, comprises frequency converter, and described frequency converter comprises power circuit, rectification circuit, inverter circuit, governor circuit, drive circuit, voltage sampling circuit and current sampling circuit; It is characterized in that: described single damping mixing Y-connection also comprises antihunt circuit and electromagnetically operated valve without the brake variable-frequency device that shakes, the corresponding connection of three outputs with described inverter circuit of connecting after described electromagnetically operated valve of three outputs of described antihunt circuit, the control input end of described electromagnetically operated valve is connected with the damping control signal output of described governor circuit; Described antihunt circuit comprises three resistance and three electric capacity, described in each, resistance and a described Capacitance parallel connection are connected to form a damping unit, described antihunt circuit comprises three damping units, one end of three described damping units interconnects, and the other end of three described damping units is respectively three outputs of described antihunt circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210307004.5A CN103633893A (en) | 2012-08-27 | 2012-08-27 | Single-damping mixed star connection vibration-free braking frequency conversion apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210307004.5A CN103633893A (en) | 2012-08-27 | 2012-08-27 | Single-damping mixed star connection vibration-free braking frequency conversion apparatus |
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| CN103633893A true CN103633893A (en) | 2014-03-12 |
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| CN201210307004.5A Pending CN103633893A (en) | 2012-08-27 | 2012-08-27 | Single-damping mixed star connection vibration-free braking frequency conversion apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114012786A (en) * | 2021-10-27 | 2022-02-08 | 北京京东乾石科技有限公司 | Emergency stop control device and robot |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1553878A (en) * | 2002-07-10 | 2004-12-08 | 三菱电机株式会社 | Elevator controller |
| CN2904473Y (en) * | 2006-05-24 | 2007-05-23 | 东方日立(成都)电控设备有限公司 | Frequency changer brake |
| CN201075834Y (en) * | 2007-06-12 | 2008-06-18 | 上海申传电气有限公司 | High power alternating current frequency conversion apparatus for coal mining machine drag system |
| CN101986798A (en) * | 2008-02-21 | 2011-03-16 | 西门子工业公司 | Method and system for braking an AC motor |
-
2012
- 2012-08-27 CN CN201210307004.5A patent/CN103633893A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1553878A (en) * | 2002-07-10 | 2004-12-08 | 三菱电机株式会社 | Elevator controller |
| CN2904473Y (en) * | 2006-05-24 | 2007-05-23 | 东方日立(成都)电控设备有限公司 | Frequency changer brake |
| CN201075834Y (en) * | 2007-06-12 | 2008-06-18 | 上海申传电气有限公司 | High power alternating current frequency conversion apparatus for coal mining machine drag system |
| CN101986798A (en) * | 2008-02-21 | 2011-03-16 | 西门子工业公司 | Method and system for braking an AC motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114012786A (en) * | 2021-10-27 | 2022-02-08 | 北京京东乾石科技有限公司 | Emergency stop control device and robot |
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Application publication date: 20140312 |