CN103580499A - Single-damper single-resistor star-connection non-vibration brake frequency conversion device - Google Patents
Single-damper single-resistor star-connection non-vibration brake frequency conversion device Download PDFInfo
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- CN103580499A CN103580499A CN201210280566.5A CN201210280566A CN103580499A CN 103580499 A CN103580499 A CN 103580499A CN 201210280566 A CN201210280566 A CN 201210280566A CN 103580499 A CN103580499 A CN 103580499A
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Abstract
The invention discloses a single-damper single-resistor star-connection non-vibration brake frequency conversion device which comprises a frequency converter. The frequency converter comprises a power circuit, a rectifying circuit, an inverter circuit, a main control circuit, a driving circuit, a voltage sampling circuit and a current sampling circuit. The single-damper single-resistor star-connection non-vibration brake frequency conversion device further comprises a damping circuit and an electromagnetic valve. The three output ends of the damping circuit are connected with the electromagnetic valve in series and connected with the three output ends of the inverter circuit correspondingly, and the control input end of the electromagnetic valve is connected with the damping control signal output end of the main control circuit. The damping circuit comprises three resistors, one end of each resistor is connected with one end of another resistor, and the other ends of the three resistors respectively serve as the three output ends of the damping circuit. According to the single-damper single-resistor star-connection non-vibration brake frequency conversion device, the resistors in the damping circuit are used for consuming energy at the output ends, namely the load ends, of the inverter circuit so as to achieve the braking purpose, and no vibration, no noise, no overvoltage, no overcurrent and no temperature rise exists in the braking process. The single-damper single-resistor star-connection non-vibration brake frequency conversion device is an upgraded product of a traditional 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 the Y-connection of improved single damping list resistance 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 the Y-connection of improved single damping list resistance without the brake variable-frequency device that shakes.
The present invention is achieved through the following technical solutions above-mentioned purpose:
Single damping list resistance of the present invention Y-connection 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; The Y-connection of described single damping list resistance 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 one end of described three resistance interconnects, and the other end of described three resistance 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 of antihunt circuit drop into the load-side of inverter 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 the resistance in antihunt circuit is 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 list resistance of the present invention Y-connection 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 list resistance of the present invention Y-connection 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, the Y-connection of described single damping list resistance 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 one end of three resistance R 1, R2, R3 interconnects, and the other end of three resistance R 1, R2, R3 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, the load-side that three resistance R 1 of antihunt circuit, R2, R3 drop into inverter circuit, depletion load end motor M energy, makes load end motor M realize fast braking.
Claims (1)
1. the Y-connection of single damping list resistance, 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: the Y-connection of described single damping list resistance 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 one end of described three resistance interconnects, and the other end of described three resistance is respectively three outputs of described antihunt circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210280566.5A CN103580499A (en) | 2012-08-09 | 2012-08-09 | Single-damper single-resistor star-connection non-vibration brake frequency conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210280566.5A CN103580499A (en) | 2012-08-09 | 2012-08-09 | Single-damper single-resistor star-connection non-vibration brake frequency conversion device |
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| Publication Number | Publication Date |
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| CN103580499A true CN103580499A (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210280566.5A Pending CN103580499A (en) | 2012-08-09 | 2012-08-09 | Single-damper single-resistor star-connection non-vibration brake frequency conversion device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947645A (en) * | 2017-11-29 | 2018-04-20 | 苏州汇川技术有限公司 | High voltage converter fast braking system and control method |
Citations (5)
| 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 |
| CN101536299A (en) * | 2006-10-31 | 2009-09-16 | 克诺尔-布里姆斯轨道车辆系统有限公司 | Traction drive of a rail vehicle for driving and generative braking with load correction |
| CN101986798A (en) * | 2008-02-21 | 2011-03-16 | 西门子工业公司 | Method and system for braking an AC motor |
-
2012
- 2012-08-09 CN CN201210280566.5A patent/CN103580499A/en active Pending
Patent Citations (5)
| 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 |
| CN101536299A (en) * | 2006-10-31 | 2009-09-16 | 克诺尔-布里姆斯轨道车辆系统有限公司 | Traction drive of a rail vehicle for driving and generative braking with load correction |
| 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947645A (en) * | 2017-11-29 | 2018-04-20 | 苏州汇川技术有限公司 | High voltage converter fast braking system and control method |
| CN107947645B (en) * | 2017-11-29 | 2021-03-05 | 苏州汇川技术有限公司 | High-voltage frequency converter rapid braking system and control method |
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Application publication date: 20140212 |