CN103633894A - Dual-damping and single-resistor star connection-based frequency conversion apparatus with a function of braking without vibration - Google Patents
Dual-damping and single-resistor star connection-based frequency conversion apparatus with a function of braking without vibration Download PDFInfo
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- CN103633894A CN103633894A CN201210309641.6A CN201210309641A CN103633894A CN 103633894 A CN103633894 A CN 103633894A CN 201210309641 A CN201210309641 A CN 201210309641A CN 103633894 A CN103633894 A CN 103633894A
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Abstract
The invention discloses a dual-damping and single-resistor star connection-based frequency conversion apparatus with a function of braking without vibration. The frequency conversion apparatus comprises a frequency converter including a main control circuit. Besides, the apparatus also comprises two damping circuits and two electromagnetic valves; three output terminals of each of the damping circuits are connected in series with one electromagnetic valve and then the whole connection unit is correspondingly connected with three output terminals of an inverter circuit; control input terminals of the electromagnetic valves are connected with a damping control signal output terminal of the main control circuit. Moreover, each of the damping circuits includes three resistors; one end of each of the three resistors in each damping circuit is connected with one another and the other ends of the three resistors in each damping circuit respectively are three output terminals of the damping circuit. According to the frequency conversion apparatus of the invention, the resistors in the damping circuits are utilized to consume energy of the output terminals, which are the load terminals, of the inverter circuits, thereby achieving an objective of braking; and there are no vibration, no noise, no overvoltage, no over current, and no temperature rising during the braking process and automatic controlling of the braking is realized by using the main control circuit. Therefore, the provided frequency conversion 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 the Y-connection of improved pair of 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 pair of damping list resistance without the brake variable-frequency device that shakes.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The Y-connection of of the present invention pair of damping list resistance 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 pair of damping list resistance also comprises the first antihunt circuit without the brake variable-frequency device that shakes, the second antihunt circuit, the first electromagnetically operated valve and the second electromagnetically operated valve, the corresponding connection of three outputs with described inverter circuit of connecting after described the first electromagnetically operated valve of three outputs of described the first antihunt circuit, the corresponding connection of three outputs with described inverter circuit of connecting after described the second electromagnetically operated valve of three outputs of described the second antihunt circuit, the control input end of the control input end of described the first electromagnetically operated valve and described the second electromagnetically operated valve is connected with the damping control signal output of described governor circuit respectively, described the first antihunt circuit comprises the first resistance, the second resistance and the 3rd resistance, one end of described the first resistance, one end of one end of described the second resistance and described the 3rd resistance interconnects, the other end of described the first resistance, the other end of the other end of described the second resistance and described the 3rd resistance is respectively three outputs of described the first antihunt circuit, described the second antihunt circuit comprises the 4th resistance, the 5th resistance and the 6th resistance, one end of described the 4th resistance, one end of one end of described the 5th resistance and described the 6th resistance interconnects, the other end of described the 4th resistance, the other end of the other end of described the 5th resistance and described the 6th resistance is respectively three outputs of described the second antihunt circuit.
When needs are braked, governor circuit is to two electromagnetically operated valves or one of them electromagnetically operated valve output drive signal, solenoid closure, connect three outputs of two antihunt circuits or one of them antihunt circuit and three outputs of inverter circuit, the resistance of antihunt circuit drops 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; By two antihunt circuits and two electromagnetically operated valves are set, can realize the Selective Control to retro-speed, realize braking more accurately and control.
Accompanying drawing explanation
Fig. 1 is that the Y-connection of of the present invention pair of damping list resistance is without the electrical block diagram of the brake variable-frequency device that shakes;
Fig. 2 is the structural representation of the first antihunt circuit of the present invention;
Fig. 3 is the structural representation of the second antihunt circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As Fig. 1, shown in Fig. 2 and Fig. 3, the Y-connection of of the present invention pair of damping list resistance 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 pair of damping list resistance also comprises the first antihunt circuit, the second antihunt circuit, the first electromagnetically operated valve and the second electromagnetically operated valve without the brake variable-frequency device that shakes, three output terminals A, B, C of the first antihunt circuit corresponding connection of three outputs with inverter circuit of connecting after the first electromagnetically operated valve, three output D, E, F of the second antihunt circuit corresponding connection of three outputs with inverter circuit of connecting after the second electromagnetically operated valve, the control input end of the control input end of the first electromagnetically operated valve and the second electromagnetically operated valve is connected with the damping control signal output of governor circuit respectively, the first antihunt circuit comprises the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3, one end of the first resistance R 1, one end of one end of the second resistance R 2 and the 3rd resistance R 3 interconnects, the other end of the first resistance R 1, the other end of the other end of the second resistance R 2 and the 3rd resistance R 3 is respectively three output terminals A of the first antihunt circuit, B, C, the second antihunt circuit comprises the 4th resistance R 4, the 5th resistance R 5 and the 6th resistance R 6, one end of the 4th resistance R 4, one end of one end of the 5th resistance R 5 and the 6th resistance R 6 interconnects, the other end of the 4th resistance R 4, the other end of the other end of the 5th resistance R 5 and the 6th resistance R 6 is respectively three output D of the second antihunt circuit, E, F.
As shown in Figure 1, Figure 2 and Figure 3, when needs are braked, governor circuit is to two or an electromagnetically operated valve output drive signal, solenoid closure, connect three-phase power input end U, V, W that three outputs of two or one antihunt circuits and three outputs of inverter circuit are load motor M, the resistance of antihunt circuit drops into the load-side of inverter circuit, and depletion load end motor M energy, makes load end motor M realize fast braking.
Claims (1)
1. two damping list resistance Y-connections, without the brake variable-frequency device that shakes, comprise 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 pair of damping list resistance also comprises the first antihunt circuit without the brake variable-frequency device that shakes, the second antihunt circuit, the first electromagnetically operated valve and the second electromagnetically operated valve, the corresponding connection of three outputs with described inverter circuit of connecting after described the first electromagnetically operated valve of three outputs of described the first antihunt circuit, the corresponding connection of three outputs with described inverter circuit of connecting after described the second electromagnetically operated valve of three outputs of described the second antihunt circuit, the control input end of the control input end of described the first electromagnetically operated valve and described the second electromagnetically operated valve is connected with the damping control signal output of described governor circuit respectively, described the first antihunt circuit comprises the first resistance, the second resistance and the 3rd resistance, one end of described the first resistance, one end of one end of described the second resistance and described the 3rd resistance interconnects, the other end of described the first resistance, the other end of the other end of described the second resistance and described the 3rd resistance is respectively three outputs of described the first antihunt circuit, described the second antihunt circuit comprises the 4th resistance, the 5th resistance and the 6th resistance, one end of described the 4th resistance, one end of one end of described the 5th resistance and described the 6th resistance interconnects, the other end of described the 4th resistance, the other end of the other end of described the 5th resistance and described the 6th resistance is respectively three outputs of described the second antihunt circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210309641.6A CN103633894A (en) | 2012-08-28 | 2012-08-28 | Dual-damping and single-resistor star connection-based frequency conversion apparatus with a function of braking without vibration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210309641.6A CN103633894A (en) | 2012-08-28 | 2012-08-28 | Dual-damping and single-resistor star connection-based frequency conversion apparatus with a function of braking without vibration |
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| CN103633894A true CN103633894A (en) | 2014-03-12 |
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| CN201210309641.6A Pending CN103633894A (en) | 2012-08-28 | 2012-08-28 | Dual-damping and single-resistor star connection-based frequency conversion apparatus with a function of braking without vibration |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050027287A (en) * | 2003-09-15 | 2005-03-21 | 현대중공업 주식회사 | The suppresses system the overvoltage which is input in the electric motor to the inverter system |
| 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 |
| CN102224097A (en) * | 2008-11-21 | 2011-10-19 | 奥的斯电梯公司 | Operation of a three-phase regenerative drive from mixed DC and single phase AC power sources |
| CN202918226U (en) * | 2012-08-28 | 2013-05-01 | 成都酷玩网络科技有限公司 | Dual-damping and single-resistor star connection-based frequency conversion apparatus with function of braking without vibration |
-
2012
- 2012-08-28 CN CN201210309641.6A patent/CN103633894A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050027287A (en) * | 2003-09-15 | 2005-03-21 | 현대중공업 주식회사 | The suppresses system the overvoltage which is input in the electric motor to the inverter system |
| 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 |
| CN102224097A (en) * | 2008-11-21 | 2011-10-19 | 奥的斯电梯公司 | Operation of a three-phase regenerative drive from mixed DC and single phase AC power sources |
| CN202918226U (en) * | 2012-08-28 | 2013-05-01 | 成都酷玩网络科技有限公司 | Dual-damping and single-resistor star connection-based frequency conversion apparatus with function of braking without vibration |
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Application publication date: 20140312 |