CN202918226U - Dual-damping and single-resistor star connection-based frequency conversion apparatus with function of braking without vibration - Google Patents
Dual-damping and single-resistor star connection-based frequency conversion apparatus with function of braking without vibration Download PDFInfo
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- CN202918226U CN202918226U CN 201220430618 CN201220430618U CN202918226U CN 202918226 U CN202918226 U CN 202918226U CN 201220430618 CN201220430618 CN 201220430618 CN 201220430618 U CN201220430618 U CN 201220430618U CN 202918226 U CN202918226 U CN 202918226U
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- resistance
- circuit
- damping
- braking
- antihunt
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Abstract
Disclosed in the utility model is 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 includes 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 ends of the three resistors of each of the damping circuits are connected mutually and the other ends thereof respectively are three output terminals of the damping circuit. According to the utility model, 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 provide frequency conversion apparatus is an upgrade product of the traditional stepless speed adjusting frequency converter.
Description
Technical field
The utility model relates to a kind of converter plant, relate in particular to a kind of on traditional frequency conversion device basis the single resistance Y-connection of the improved pair of damping without the brake variable-frequency device that shakes.
Background technology
Frequency converter has widely purposes 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 are in order to enhance productivity, and the stopping power of frequency converter has been proposed very high requirement.Work period such as steel mill refining one heat steel is 35 minutes, each work period, all require frequency conversion speed-adjusting system, and at 4-l0 dragging motor within second, if frequency converter does not have stopping power, need at least 6 minutes time just can finish reduction of speed.Possess the occasion of frequent braking function for this needs, use the frequency converter without the fast braking ability obviously can affect production efficiency.
At present industrial applications widely accepted braking method have:
1, increase brake unit at the transducer power unit dc bus: this method can make shorten down time, depends on the size of brake unit the fastest attainable down time.But for the tandem type high voltage converter, power cell quantity is many, and each unit increases a brake unit, and not only cost increases greatly, and control is very complicated.
2, DC injection braking: this kind method to input direct-current on the motor stator, in motor, can not increase the cost of frequency converter, but brake torque and dynamic characteristics is all bad with energy consumption by software, and the rotating speed of motor in the reduction of speed process also is difficult to estimate.If DC injection braking needs very high brake torque, then require frequency converter that very strong conveyance capacity is arranged, otherwise cause easily the frequency converter overcurrent tripping.
3, harmonic braking: this method increases harmonic current by software, consumes energy in rotor and the load by increasing the loss of electric machine.This method can cause that the serious heating of motor and noise increase and the high torque (HT) ripple, and this is disadvantage.
4, large-slip braking: when induction motor during by prime mover driven, because the moment of inertia of load, the speed of rotor is greater than the synchronizing speed of rotation air-gap field, and this moment, motor showed as induction generator, and slippage in this case is negative value.Under specific slippage condition, the parameter of electric machine is certain, has such working point, and it will all be converted into from the mechanical energy that prime mover obtains the heat energy of induction electric machine stator and rotor, not have energy to return 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, cause easily 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 is complicated, and motor temperature, noise and serious vibration increase, the easy overvoltage of frequency converter or overcurrent tripping in the braking procedure.
Summary of the invention
The purpose of this utility model with regard to be to provide in order to address the above problem a kind of on traditional frequency conversion device basis the improved pair of single resistance Y-connection of damping without the brake variable-frequency device that shakes.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The described in the utility model pair of single resistance Y-connection of damping 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 described pair of single resistance Y-connection of damping 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 behind 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 behind described the second electromagnetically operated valve of three outputs of described the second antihunt circuit, the control input end of described the first electromagnetically operated valve be connected the control input end of the second electromagnetically operated valve and be 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 described the second resistance and an end of described the 3rd resistance interconnect, 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 described the 5th resistance and an end of described the 6th resistance interconnect 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 the load end motor realize fast braking.
The beneficial effects of the utility model are:
It is the purpose that energy consumption of load end reaches braking to the output of inverter circuit that the utility model utilizes the resistance in the antihunt circuit, friction in the braking procedure, noiselessness, without overvoltage, without overcurrent, without temperature rise, and by the automatic control that the governor circuit realization is braked, 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 more accurately braking control.
Description of drawings
Fig. 1 is that the single resistance Y-connection of described in the utility model pair of damping 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 described in the utility model;
Fig. 3 is the structural representation of the second antihunt circuit described in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
Such as Fig. 1, Fig. 2 and shown in Figure 3, the described in the utility model pair of single resistance Y-connection of damping 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 to the electric current of the voltage of the input of inverter circuit and output respectively and are transferred to governor circuit, governor circuit is controlled inverter circuit by drive circuit, the input of power circuit connects wherein two live wires in the three phase mains, and the output of power circuit is connected with the power input of governor circuit; The described pair of single resistance Y-connection of damping 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 behind 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 behind the second electromagnetically operated valve, the control input end of the first electromagnetically operated valve be connected the control input end of electromagnetically operated valve and be 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.
Such as Fig. 1, Fig. 2 and shown in Figure 3, when needs are braked, governor circuit is to two or an electromagnetically operated valve output drive signal, solenoid closure, three-phase power input end U, V, W that three outputs connecting three outputs of two or one antihunt circuits and 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. the single resistance Y-connection of two dampings 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; It is characterized in that: the described pair of single resistance Y-connection of damping 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 behind 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 behind described the second electromagnetically operated valve of three outputs of described the second antihunt circuit, the control input end of described the first electromagnetically operated valve be connected the control input end of the second electromagnetically operated valve and be 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 described the second resistance and an end of described the 3rd resistance interconnect, 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 described the 5th resistance and an end of described the 6th resistance interconnect 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 |
|---|---|---|---|
| CN 201220430618 CN202918226U (en) | 2012-08-28 | 2012-08-28 | Dual-damping and single-resistor star connection-based frequency conversion apparatus with function of braking without vibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220430618 CN202918226U (en) | 2012-08-28 | 2012-08-28 | Dual-damping and single-resistor star connection-based frequency conversion apparatus with function of braking without vibration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202918226U true CN202918226U (en) | 2013-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220430618 Expired - Fee Related CN202918226U (en) | 2012-08-28 | 2012-08-28 | Dual-damping and single-resistor star connection-based frequency conversion apparatus with function of braking without vibration |
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| Country | Link |
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| CN (1) | CN202918226U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633894A (en) * | 2012-08-28 | 2014-03-12 | 成都酷玩网络科技有限公司 | Dual-damping and single-resistor star connection-based frequency conversion apparatus with a function of braking without vibration |
-
2012
- 2012-08-28 CN CN 201220430618 patent/CN202918226U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633894A (en) * | 2012-08-28 | 2014-03-12 | 成都酷玩网络科技有限公司 | Dual-damping and single-resistor star connection-based frequency conversion apparatus with a function of braking without vibration |
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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: 20130501 Termination date: 20130828 |