CN202190217U - Traveling crane/cart traveling transducer brake unit management circuit for nuclear power station - Google Patents
Traveling crane/cart traveling transducer brake unit management circuit for nuclear power station Download PDFInfo
- Publication number
- CN202190217U CN202190217U CN2011202673991U CN201120267399U CN202190217U CN 202190217 U CN202190217 U CN 202190217U CN 2011202673991 U CN2011202673991 U CN 2011202673991U CN 201120267399 U CN201120267399 U CN 201120267399U CN 202190217 U CN202190217 U CN 202190217U
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- brake unit
- brake
- inverter circuit
- management circuit
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Abstract
The utility model relates to a traveling crane/cart traveling transducer brake unit management circuit for a nuclear power station, which comprises a rectifier circuit and an inverter circuit, wherein the anode output end of the rectifier circuit is connected with the anode input end of the inverter circuit, and the cathode output end of the rectifier circuit is connected with the cathode input end of the inverter circuit. The large vehicle traveling transducer brake unit management circuit also comprises an energy consumption brake loop, wherein the energy consumption brake loop comprises a brake resistance RB for consuming the energy on a direct current circuit and a brake unit BV for controlling discharging, one end of the brake resistance RB is connected with the anode input end of the inverter circuit, and the other end of the brake resistance RB is connected with the cathode input end of the inverter circuit through the brake unit BV. Compared with the prior art, the large vehicle traveling transducer brake unit management circuit disclosed by the utility model has the advantages that working reliability of the frequent starting of a traveling crane is greatly increased, and the like.
Description
Technical field
The utility model relates to a kind of frequency converter brake unit management circuit, especially relates to a kind of used in nuclear power station driving large vehicle walking frequency converter brake unit management circuit.
Background technology
Because science and technology development, the AC converter technical development is increasingly mature.Because of frequency converter reliable operation, simple to operate, be widely applied in each production field, in the production process of enterprise, play significant role.Lifting in the nuclear power station, transportation main equipment are widely used, for system automation is played a positive role.Driving system uses the device of frequency converter that large vehicle walking, trailer conversion etc. are arranged at present.
Resultant fault often appears in second phase driving large vehicle walking frequency converter after going into operation, and cart movable motor the secondary stator coil also takes place burns out fault.Coil all is faults that alternate puncture causes, and analyzing reason is that overvoltage causes coil to damage.
The operation principle of frequency converter: three-phase alternating current becomes direct current through behind the three phase full wave rectification, and direct current becomes alternating current through IGBT element inversion conversion, and alternating current is added in the motor load.Conducting through regulating the IGBT element and ending realizes the frequency adjustment of frequency converter, thereby changes rotating speed of motor.
In frequency conversion speed-adjusting system, the reduction of speed of motor and shutdown realized through reducing frequency gradually, in the moment that frequency has just reduced; The synchronous speed of motor descends thereupon, because machinery inertial, the rotating speed of motor can not reduce immediately, remains unchanged; When synchronous speed is lower than rotor speed, rotor winding cutting magnetic line in the opposite direction, the phase place of rotor current is opposite; Almost change 180 °, made motor be in generating state, be referred to as the regenerative braking state.The motor regenerative electric energy turns back on the dc bus through behind the diode rectification of VD7-VD12; Because energy can't turn back in the electrical network, can only absorb by CR1 and CR2, DC bus-bar voltage is raise; Also be referred to as " pump up voltage ", too high voltage makes the component wear of frequency converter.Because the dielectric strength of motor is relatively low, too high voltage damages coil of stator of motor, and reporting to the police after the overvoltage appears in frequency converter, sends the integrated alarm signal.
This type of fault takes place wherein to burn out motor 2 times more than 8 times, therefore must manage to solve.
The utility model content
The purpose of the utility model is exactly for the defective that overcomes above-mentioned prior art existence a kind of used in nuclear power station driving large vehicle walking frequency converter brake unit management circuit that can increase the functional reliability of driving frequent starting greatly to be provided.
The purpose of the utility model can realize through following technical scheme: a kind of used in nuclear power station driving large vehicle walking frequency converter brake unit management circuit; This management circuit comprises rectification circuit and inverter circuit; The cathode output end of rectification circuit is connected with the electrode input end of inverter circuit; The cathode output end of rectification circuit is connected with the negative input of inverter circuit; It is characterized in that described management circuit also comprises the dynamic braking loop, this dynamic braking loop comprises brake resistance RB that is used to consume the energy on the DC circuit and the brake unit BV that is used to control discharge; The end of described brake resistance RB is connected with the electrode input end of inverter circuit, and the other end of brake resistance RB is connected with the negative input of inverter circuit through brake unit BV.
Described brake unit BV is the IGBT pipe.
Compared with prior art, the utility model makes the inside DC bus-bar voltage of frequency converter always work in allowed band, and the coil voltage of motor can not surpass permissible value yet and damage, and the functional reliability of the frequent starting of particularly driving a vehicle increases greatly.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment
As shown in Figure 1, a kind of used in nuclear power station driving large vehicle walking frequency converter brake unit management circuit, this management circuit comprises rectification circuit 1, inverter circuit 3 and dynamic braking loop 2.The cathode output end of rectification circuit 1 is connected with the electrode input end of inverter circuit 3, and the cathode output end of rectification circuit 1 is connected with the negative input of inverter circuit 3.The dynamic braking loop comprises that brake resistance RB that is used to consume the energy on the DC circuit and the brake unit BV that is used to control discharge, brake unit BV are the IGBT pipe.The end of brake resistance RB is connected with the electrode input end of inverter circuit 3, and the other end of brake resistance RB is connected with the negative input of inverter circuit 3 through brake unit BV.Brake resistance RB is used to consume the energy on the DC circuit, makes direct voltage remain on the level of permission.Brake unit BV is the circuit of control discharge loop.During brake unit BV conducting, make DC loop bleed off electric energy, reduce direct voltage through brake resistance RB.Voltage is in normal range (NR) the time, and brake unit BV reliably ends, and guarantees the inside dc voltage stability of frequency converter, and energy can not lost.
Three phase mains is through R, S, T input input 380V alternating current, and through the three-phase bridge rectification diode VD1～VD6 of rectification circuit, the output direct current is added on the dc bus through fuse RL, electric capacity of bus parallel connection and resistance absorption circuit.The capacitance resistance loop is made up of capacitor C 1, C2 and resistance R C1 and RC2.Dc bus is dynamic braking loop of parallel connection simultaneously, and the dynamic braking loop is made up of the IGBT pipe and the brake resistance RB of control circuit break-make.The input of inverter circuit is received on the dc bus.Inverter circuit amounts to 6 FETs by V1-V6 and forms, and control loop according to certain sequential, is controlled the FET output through 6 FET inputs.Thereby direct current is transformed into sinusoidal three-phase symmetrical alternating current electricity, and control output frequency and voltage amplitude.Diode VD7～VD12 is parallel to the output of FET, as voltage buffering and current buffering effect.
Claims (2)
1. used in nuclear power station driving large vehicle walking frequency converter brake unit management circuit; This management circuit comprises rectification circuit and inverter circuit; The cathode output end of rectification circuit is connected with the electrode input end of inverter circuit; The cathode output end of rectification circuit is connected with the negative input of inverter circuit; It is characterized in that described management circuit also comprises the dynamic braking loop, this dynamic braking loop comprises brake resistance RB that is used to consume the energy on the DC circuit and the brake unit BV that is used to control discharge; The end of described brake resistance RB is connected with the electrode input end of inverter circuit, and the other end of brake resistance RB is connected with the negative input of inverter circuit through brake unit BV.
2. a kind of used in nuclear power station driving large vehicle walking frequency converter brake unit management circuit according to claim 1 is characterized in that described brake unit BV is the IGBT pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202673991U CN202190217U (en) | 2011-07-26 | 2011-07-26 | Traveling crane/cart traveling transducer brake unit management circuit for nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202673991U CN202190217U (en) | 2011-07-26 | 2011-07-26 | Traveling crane/cart traveling transducer brake unit management circuit for nuclear power station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202190217U true CN202190217U (en) | 2012-04-11 |
Family
ID=45921651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202673991U Expired - Fee Related CN202190217U (en) | 2011-07-26 | 2011-07-26 | Traveling crane/cart traveling transducer brake unit management circuit for nuclear power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202190217U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877780A (en) * | 2016-11-16 | 2017-06-20 | 长沙奥托自动化技术有限公司 | One kind driving frequency converter control system |
-
2011
- 2011-07-26 CN CN2011202673991U patent/CN202190217U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877780A (en) * | 2016-11-16 | 2017-06-20 | 长沙奥托自动化技术有限公司 | One kind driving frequency converter control system |
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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: 20120411 Termination date: 20140726 |
|
| EXPY | Termination of patent right or utility model |