CN212909268U - Frequency converter side motor filter applied to long-line driving occasion - Google Patents
Frequency converter side motor filter applied to long-line driving occasion Download PDFInfo
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- CN212909268U CN212909268U CN202022090563.8U CN202022090563U CN212909268U CN 212909268 U CN212909268 U CN 212909268U CN 202022090563 U CN202022090563 U CN 202022090563U CN 212909268 U CN212909268 U CN 212909268U
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Abstract
The utility model discloses a converter side motor filter applied to long line drive occasion, including differential mode filter circuit and common mode filter circuit, differential mode filter circuit installs between the AC output port of converter and long line cable, and differential mode filter circuit includes differential mode inductance, differential mode electric capacity and damping resistance, and wherein resistance plays the effect of weak damping, and electric capacity uses Y electric capacity and is the triangle-shaped connected mode; the common mode filter circuit is realized by adopting a three-phase common mode inductor or a common mode transformer and a damping resistor. The utility model discloses motor filter can eliminate the excessive pressure of motor side to long line cable junction's converter and motor, restraines long line driving system's electromagnetic interference, and the leakage current of suppression motor in start-up and operation process makes the motor normally work.
Description
Technical Field
The utility model belongs to the technical field of the motor system filtering, concretely relates to be applied to converter side motor filter of long line drive occasion.
Background
The function of the filter is to allow the signals of a certain part of frequencies to pass smoothly, while the signals of another part of frequencies are greatly suppressed, and the filter is essentially a frequency selection circuit. The power filter is an electrical device which effectively filters a frequency point with a specific frequency in a power line or frequencies except the frequency point, and the power filter has the function of obtaining a power signal with the specific frequency or eliminating the power signal with the specific frequency by accessing the power filter into the power line; by using the characteristic of the power supply filter, a square wave group or composite noise wave passing through the power supply filter can be changed into a sine wave with a specific frequency. The power filter is a passive bidirectional network with a power source at one end and a load at the other end. The principle of the power filter is an impedance adaptation network: the greater the impedance adaptation of the input and output sides of the power filter to the power and load sides, the more effective the attenuation of electromagnetic interference. According to the requirements of GJB151A-1997 requirements on electromagnetic emission and sensitivity of military equipment and subsystems, the equipment can normally work in an electromagnetic environment, particularly can keep a good working state in a severe electromagnetic environment, and various electronic equipment needs to be designed for electromagnetic compatibility so as to meet the requirement of the environment. The alternating current filter in the prior art adopts a common-mode inductor and a capacitor for filtering, an alternating current motor can generate interference signals of different degrees from thousands of hertz to hundreds of megahertz in the rotation process, and especially the interference of thousands of hertz cannot meet the test requirements by adopting a common circuit.
When the connection distance between the motor driver and the motor is long, on one hand, a serious overvoltage phenomenon can occur on the motor side, the insulation between the motor and a cable can be damaged due to the overvoltage, and a motor driving system cannot work; on the other hand, the long-line cable has larger parasitic inductance and parasitic capacitance, and overvoltage of the long-line cable is applied to the parasitic inductance and parasitic capacitance, so that larger electromagnetic interference can be generated to the outside, and normal operation of surrounding electrical equipment is influenced; the motor filter filters higher frequency harmonic waves which generate overvoltage and electromagnetic interference, so that the motor can normally run. The motor filter is a passive bidirectional network, one end of the passive bidirectional network is used for outputting a power signal of the frequency converter, and the other end of the passive bidirectional network is used for inputting a power signal of the motor; the motor filter can be placed on the side of the frequency converter or the motor, and the filter placed on the side of the motor is difficult to install. Therefore, a motor filter placed on the inverter side is needed to suppress the negative effects of the long-line cable drive.
Disclosure of Invention
In view of the above, the utility model provides a be applied to converter side motor filter of long line drive occasion can solve alternating current motor and converter and pass through excessive pressure problem and the electromagnetic interference problem that long line cable junction appears.
A frequency converter side motor filter applied to a long line drive occasion comprises a differential mode filter circuit, wherein the differential mode filter circuit is installed between an alternating current output port of a frequency converter and a long line cable, and comprises a differential mode inductor, a differential mode capacitor and a damping resistor.
Furthermore, the frequency converter side motor filter further comprises a common mode filter circuit, and the common mode filter circuit is connected with the differential mode filter circuit.
Further, the differential mode filter circuit comprises three differential mode inductors L1-L3, three differential mode capacitors C1-C3 and three damping resistors R1-R3, wherein one end of the differential mode inductor L1 is connected with an A-phase alternating current output port of the frequency converter, the other end of the differential mode inductor L1 is connected with one end of the differential mode capacitor C2, one end of the damping resistor R1 and one end of the A-phase long-line cable, one end of the differential mode inductor L2 is connected with a B-phase alternating current output port of the frequency converter, the other end of the differential mode inductor L2 is connected with one end of the damping resistor R2, one end of the differential mode capacitor C3 and one end of the B-phase long-line cable, one end of the differential mode inductor L3 is connected with a C-phase alternating current output port of the frequency converter, the other end of the differential mode inductor L3 is connected with one end of the damping resistor R3, one end of the differential mode capacitor C1 and one end of the C-phase long-line cable, the other end of the differential mode capacitor, the other end of the differential mode capacitor C2 is connected with the other end of the damping resistor R2, the other end of the differential mode capacitor C3 is connected with the other end of the damping resistor R3, and the other end of the three-phase long-wire cable is correspondingly connected with a three-phase stator winding of the motor.
Further, the differential mode capacitors C1-C3 adopt safety type Y capacitors.
Furthermore, the common mode filter circuit is composed of a three-phase common mode inductor L4, a phase A winding of the three-phase common mode inductor L4 is connected between a phase A AC output port of the frequency converter and a differential mode inductor L1, a phase B winding of the three-phase common mode inductor L4 is connected between a phase B AC output port of the frequency converter and a differential mode inductor L2, and a phase C winding of the three-phase common mode inductor L4 is connected between a phase C AC output port of the frequency converter and a differential mode inductor L3.
Furthermore, the common mode filter circuit comprises a common mode transformer and a damping resistor R4, wherein an A-phase winding of the common mode transformer is connected between an A-phase alternating current output port of the frequency converter and a differential mode inductor L1, a B-phase winding of the common mode transformer is connected between a B-phase alternating current output port of the frequency converter and a differential mode inductor L2, a C-phase winding of the common mode transformer is connected between a C-phase alternating current output port of the frequency converter and a differential mode inductor L3, the damping resistor R4 is connected with a secondary winding in parallel, and the secondary winding is electromagnetically coupled with the C-phase winding.
The resistance in the designed filter plays a role of weak damping, and is not used as the resistance of impedance matching, but the resistance value of the resistance used as the weak damping action is smaller than the resistance of the impedance matching, so the loss of the designed filter is smaller; the capacitor in the filter designed by the utility model uses Y capacitor and is in a triangle connection mode, so that the capacitance value and the volume of the capacitor can be reduced; the utility model discloses a wave filter belongs to sine wave filter, and the filter effect is good, and excessive pressure can not appear at the cable end to can also effectively restrain the motor after adding common mode filter circuit and starting and the leakage current of operation in-process.
Therefore, compared with the prior art, the utility model discloses motor filter can eliminate the excessive pressure of motor side to long line cable junction's converter and motor, restraines long line driving system's electromagnetic interference, and the leakage current of suppression motor in start-up and operation process makes the motor normally work.
Drawings
Fig. 1 is a schematic diagram of a first implementation structure of a long-line driving system provided with a motor filter.
Fig. 2 is a schematic diagram of a second implementation structure of the long-line driving system provided with the motor filter.
Fig. 3 is a schematic diagram of a third implementation structure of the long-line driving system provided with the motor filter.
Fig. 4(a) is a schematic diagram of a voltage waveform at the front end of a filter of a long-line driving system.
Fig. 4(b) is a schematic diagram of the voltage waveform at the rear end of the filter of the long-line driving system.
Detailed Description
To describe the present invention more specifically, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and the detailed description.
Example 1
As shown in fig. 1, the motor filter of this embodiment includes a differential mode filter, which includes three differential mode inductors L1-L3, three differential mode capacitors C1-C3, and three damping resistors R1-R3, wherein one end of the differential mode inductor L1 is connected to an a-phase ac output port of the inverter, the other end of the differential mode inductor L1 is connected to one end of the differential mode capacitor C2, one end of the damping resistor R1, and one end of the a-phase long-line cable, one end of the differential mode inductor L2 is connected to a B-phase ac output port of the inverter, the other end of the differential mode inductor L2 is connected to one end of the damping resistor R2, one end of the differential mode capacitor C3, and one end of the B-phase long-line cable, one end of the differential mode inductor L3 is connected to a C-phase ac output port of the inverter, the other end of the damping inductor L3 is connected to one end of the damping resistor R3, one end of the differential mode capacitor C1, and, the other end of the differential mode capacitor C1 is connected with the other end of the damping resistor R1, the other end of the differential mode capacitor C2 is connected with the other end of the damping resistor R2, the other end of the differential mode capacitor C3 is connected with the other end of the damping resistor R3, and the other end of the three-phase long-line cable is correspondingly connected with a three-phase stator winding of the motor.
In the embodiment, the differential mode capacitor uses an ampere-rule Y-type capacitor, and a triangular connection mode is adopted, so that compared with a Y-type connection mode, the capacitance value of each phase of filter capacitor is equivalently increased; the damping resistor is used for suppressing the oscillation possibly caused by the external interference and plays a role of weak damping, and the damping ratio is set between 0.05 and 0.1 in order to better suppress the oscillation of the filter possibly caused by the external interference. In order to ensure the robustness and the anti-interference capability of the filter, the cut-off frequency of the filter is more than 10 times of the running frequency of the motor and less than half of the switching frequency, and when the length of the long-line cable is longer and the overvoltage requirement on the motor side is higher, the filter has more outstanding advantages.
Example 2
As shown in fig. 2, the motor filter of this embodiment includes a common mode filter circuit and a differential mode filter circuit, the common mode filter circuit is composed of a three-phase common mode inductor, and the differential mode filter circuit is the same as in embodiment 1, wherein one end of a winding 1 of the three-phase common mode inductor is connected to an a ac output terminal of the frequency converter, the other end of the winding 1 is connected to one end of a differential mode inductor L1 of the differential mode filter circuit, one end of a winding 2 of the three-phase common mode inductor is connected to a B ac output terminal of the frequency converter, the other end of the winding 2 is connected to one end of a differential mode inductor L2 of the differential mode filter circuit, one end of a winding 3 of the three-phase common mode inductor is connected to a C ac output terminal of the frequency converter, the other end of the winding 3 is connected to one end of a differential mode inductor L3 of.
Example 3
As shown in fig. 3, the motor filter of this embodiment includes a common mode filter circuit and a differential mode filter circuit, the common mode filter circuit is composed of a common mode transformer and a damping resistor, the differential mode filter circuit is the same as that in embodiment 1, wherein one end of a winding 1 of a three-phase common mode inductor is connected to an a ac output terminal of the frequency converter, the other end of the winding 1 is connected to one end of a differential mode inductor L1 of the differential mode filter circuit, one end of a winding 2 of the three-phase common mode inductor is connected to a B ac output terminal of the frequency converter, the other end of the winding 2 is connected to one end of a differential mode inductor L2 of the differential mode filter circuit, one end of a winding 3 of the three-phase common mode inductor is connected to a C ac output terminal of the frequency converter, the other end of the winding 3 is connected to one end of a differential mode inductor L3 of the differential mode filter circuit, and; in the embodiment, the inductance values of the windings 1-3 of the common mode transformer are about 5mH, and the damping resistance connected with the secondary winding 4 is about 2500 omega.
Verification example
The voltage of the direct current side of a 200m long-line driving system built in the experiment is 380V, and if no overvoltage suppression measure is added, the overvoltage of the tail end (the motor side) of the cable can exceed two times of the voltage of the direct current side.
After the filter designed by the utility model is inserted, the two ends of the filter have no overvoltage phenomenon, the front end voltage of the filter is shown in fig. 4(a), and the rear end voltage of the filter is shown in fig. 4 (b); in addition, the filter has only 20W loss, and compared with the traditional RLC filter and the LR filter, the power consumption of the resistor is small.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to the above-described embodiments may be made, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention according to the disclosure of the present invention within the protection scope of the present invention.
Claims (6)
1. The utility model provides a be applied to converter side motor filter of long line drive occasion which characterized in that: the differential mode filter circuit is arranged between an alternating current output port of the frequency converter and the long-line cable, and comprises a differential mode inductor, a differential mode capacitor and a damping resistor.
2. The frequency converter-side motor filter according to claim 1, characterized in that: the differential mode filter circuit comprises three differential mode inductors L1-L3, three differential mode capacitors C1-C3 and three damping resistors R1-R3, wherein one end of a differential mode inductor L1 is connected with an A-phase alternating current output port of the frequency converter, the other end of a differential mode inductor L1 is connected with one end of a differential mode capacitor C2, one end of a damping resistor R1 and one end of an A-phase long-line cable, one end of a differential mode inductor L2 is connected with a B-phase alternating current output port of the frequency converter, the other end of a differential mode inductor L2 is connected with one end of a damping resistor R2, one end of a differential mode capacitor C3 and one end of a B-phase long-line cable, one end of a differential mode inductor L3 is connected with a C-phase alternating current output port of the frequency converter, the other end of a differential mode inductor L8 is connected with one end of a damping resistor R3, one end of a differential mode capacitor C1 and one end of the C-phase long-line cable, the other end of a differential mode, the other end of the differential mode capacitor C2 is connected with the other end of the damping resistor R2, the other end of the differential mode capacitor C3 is connected with the other end of the damping resistor R3, and the other end of the three-phase long-wire cable is correspondingly connected with a three-phase stator winding of the motor.
3. The frequency converter-side motor filter according to claim 2, characterized in that: the device also comprises a common-mode filter circuit, wherein the common-mode filter circuit is connected with the differential-mode filter circuit.
4. The frequency converter-side motor filter according to claim 2, characterized in that: and the differential mode capacitors C1-C3 adopt safety type Y capacitors.
5. The frequency converter-side motor filter according to claim 3, characterized in that: the common mode filter circuit is composed of a three-phase common mode inductor L4, an A-phase winding of the three-phase common mode inductor L4 is connected between an A-phase alternating current output port of the frequency converter and a differential mode inductor L1, a B-phase winding of the three-phase common mode inductor L4 is connected between a B-phase alternating current output port of the frequency converter and the differential mode inductor L2, and a C-phase winding of the three-phase common mode inductor L4 is connected between a C-phase alternating current output port of the frequency converter and a differential mode inductor L3.
6. The frequency converter-side motor filter according to claim 3, characterized in that: the common mode filter circuit comprises a common mode transformer and a damping resistor R4, wherein an A-phase winding of the common mode transformer is connected between an A-phase alternating current output port of the frequency converter and a differential mode inductor L1, a B-phase winding of the common mode transformer is connected between a B-phase alternating current output port of the frequency converter and a differential mode inductor L2, a C-phase winding of the common mode transformer is connected between a C-phase alternating current output port of the frequency converter and a differential mode inductor L3, the damping resistor R4 is connected with a secondary winding in parallel, and the secondary winding is in electromagnetic coupling with the C-phase winding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022090563.8U CN212909268U (en) | 2020-09-22 | 2020-09-22 | Frequency converter side motor filter applied to long-line driving occasion |
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| CN202022090563.8U CN212909268U (en) | 2020-09-22 | 2020-09-22 | Frequency converter side motor filter applied to long-line driving occasion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113420398A (en) * | 2021-06-22 | 2021-09-21 | 杭州和昶电子科技有限公司 | Comprehensive high-frequency modeling method for cable in variable-frequency motor long-line driving system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113420398A (en) * | 2021-06-22 | 2021-09-21 | 杭州和昶电子科技有限公司 | Comprehensive high-frequency modeling method for cable in variable-frequency motor long-line driving system |
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