CN204906245U - Heterogeneous variable -frequency driving system of high -low pressure conversion star type - Google Patents
Heterogeneous variable -frequency driving system of high -low pressure conversion star type Download PDFInfo
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- CN204906245U CN204906245U CN201520744896.4U CN201520744896U CN204906245U CN 204906245 U CN204906245 U CN 204906245U CN 201520744896 U CN201520744896 U CN 201520744896U CN 204906245 U CN204906245 U CN 204906245U
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Abstract
The utility model provides a heterogeneous variable -frequency driving system of high -low pressure conversion star type, relates to big power motor of high pressure and drive control. Frequency conversion drive technical scheme commonly used at present mainly concentrates on conventional motor adapter converter, and motor insulation is short -lived, the heat -sinking capability of motor is poor. The utility model discloses a phase -shifting transformer, rectifier circuit, inverter circuit, polyphase machine, the control circuit who links to each other with phase -shifting transformer, rectifier circuit, inverter circuit and polyphase machine, phase -shifting transformer's primary winding links to each other with alternating current power supply, and phase -shifting transformer's rectifier circuit 1 links to each other with rectifier circuit, its characterized in that: secondary's quantity is the same with rectifier circuit's quantity, and a secondary is connected with a rectifier circuit, connects formation DC power supply altogether between each rectifier circuit altogether, and rectifier circuit's output links to each other with inverter circuit. This technical scheme when realizing high voltage, heavy current, simple structure, the reduced insulation requirement improves the thermal diffusivity of motor, increases power density.
Description
Technical field
The utility model relates to high-voltage high-power motor and drived control thereof, particularly relates to the star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion, belongs to electric department electric motor and controller field.
Background technology
Heavy-duty motor frequency control is the important means that motor efficiency promotes, and along with the continuous advancement of power electronic device, heavy-duty motor frequency conversion speed-adjusting system is used widely.Variable-frequency driving technique scheme conventional at present mainly concentrates on conventional motor adapter converter, variable-frequency motor and frequency conversion speed-adjusting system are not considered as a system architecture, there are some limitation, the most frequently used driving solution as high voltage three-phase motor adds cascaded high-voltage frequency converter, its weakness is often different by the current potential of several independently H bridges, must carry out insulation processing, also the more difficult liquid radiating that realizes cools; Although three-level frequency-converter speed-regulating scheme can solve the common ground problem of power device, due to the withstand voltage of power device and the restriction of electric current, the output of high voltage and big current cannot be realized; Many level can break through certain voltage restriction, but technology of pressure equalization and hardware configuration are very complicated; Two level three phase variable frequencies are more by the restriction of voltage and current.In motor side, due to the raising of power supply voltage level, be also greatly improve to the insulation system of high-voltage motor and manufacture process requirement, the insulation life of motor reduces, and manufacturing process cost improves, and motor radiating condition is deteriorated, and power density declines.
Based on the consideration to these factors, special proposition the utility model, quasi-solution is an above-mentioned difficult problem certainly.
Utility model content
The technical assignment of the technical problems to be solved in the utility model and proposition carries out improving to prior art and improves, a kind of high-low pressure is provided to change star-like heterogeneous frequency changing driving system, the object improve the electrical machine insulation life-span to reach, improving the heat-sinking capability of motor.For this reason, the utility model takes following technical scheme.
The star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion, comprise phase shifting transformer, rectification circuit, inverter circuit, polyphase machine, with phase shifting transformer, rectification circuit, the control circuit that inverter circuit is connected with polyphase machine, the armature winding of phase shifting transformer is connected with AC power, the secondary winding of phase shifting transformer is connected with rectification circuit, it is characterized in that: the quantity of secondary winding is identical with the quantity of rectification circuit, one secondary winding is connected with a rectification circuit, the DC power supply on common ground is connected to form altogether between each rectification circuit, the output of rectification circuit is connected with inverter circuit.The out-primary for phase shift depressor that system is connected with electrical network end, its secondary winding is several Phase shift winding, according to the number of phases of heterogeneous frequency conversion, is uniformly distributed phase shift angle to Phase shift winding, alleviates electrical network end harmonic pollution.By phase shift transformation, effectively high-voltage fence can be changed into some independently low-voltage three-phase alternating-current supplies, realize the high-low pressure conversion of power-supply system, make the rectification circuit of rear end, inverter circuit, polyphase machine all can by low voltage Specification Design, compare high-voltage motor like this, the insulation thickness of motor winding can be obviously thinning, and radiating effect significantly improves, and the active conductor utilance in motor stator is greatly improved.Through phase shifting transformer transformation Hou Ge road AC power, one_to_one corresponding configures an ac rectifier, and due to phase shift, the amplitude of each road alternating current circuit voltage has fine distinction, makes the direct voltage after rectifying and wave-filtering also have nuance; So the technical program adopts phase shifting transformer, and the DC power supply after rectification independently exists mutually; Connect altogether between each rectification circuit, can simplify cooling structure, increase the range of choice of the type of cooling, the technical program is while realizing high voltage, big current, and structure is simple, reduces insulating requirements, improves the thermal diffusivity of motor, increases power density.
As improving further and supplementing technique scheme, the utility model also comprises following additional technical feature.
The quantity of inverter circuit is identical with the number of phases of polyphase machine stator, and an inverter circuit is connected with one end of a motor stator winding, and the other end of motor stator winding is connected to each other and forms heterogeneous star winding.Motor can be asynchronous machine or synchronous machine, and winding can be flat copper electromagnetic wire formed coil, or sub-thread/multiply enamel-cover circle copper magnet wire.
The quantity of rectification circuit is identical with the quantity of inverter circuit, and a rectification circuit is connected with an inverter circuit; Or inverter circuit quantity is the integral multiple of rectification circuit quantity, inverter circuit parallel connection forms polyphase inverter circuit in parallel group; Polyphase inverter quantity in each polyphase inverter circuit in parallel group is identical, and a rectification circuit is connected with an inverter circuit group.When motor phase is abundant, a secondary Phase shift winding can be carried out and provide electric power to multiple unit, simplify the structure of phase shifting transformer.
Described polyphase inverter circuit is half-bridge inversion circuit.Compared with cascaded high-voltage frequency converter, the power electronic device in inverter circuit consumes and reduces half, greatly can reduce product cost, meanwhile, the semiconductor PN of every primary Ioops reduces to 2 by 4, effectively can reduce the energy loss of inverter circuit, reach the object of raising efficiency.
The quantity of described inverter circuit, polyphase machine stator winding be more than or equal to 5 integer; The quantity of inverter circuit, polyphase machine stator winding is identical with the quantity of phase shifting transformer secondary winding, rectification circuit or be integral multiple.
Described control circuit establishes communication line to detect in real time the operation of phase shifting transformer, rectification circuit, inverter circuit, polyphase machine, drived control, realizes controlling in order, feed back and adjusting.
Described control circuit establishes man-machine interface with to the operation Real Time Observation of phase shifting transformer, rectification circuit, inverter circuit, polyphase machine and phase sequence control is carried out in the adjustment by control strategy.The technical program, by the adjustment of control strategy, realizes pole-changing and covert operation, under the prerequisite not increasing motor eddy current loss, improves the speed ratio of system.
Described rectification circuit is three-phase bridge rectification circuit, and it carries out rectification by diode, controllable silicon or IGBT.
Phase shifting transformer is dry-type transformer or oil-immersed type transformer; The armature winding of phase shifting transformer, secondary winding are wye connection, triangular form connection or star/triangle compound connection.
Described inverter circuit and rectification circuit are altogether; Described inverter circuit is two level bridge inverter main circuits, three level bridge inverter main circuit or many level bridge inverter main circuit.
Beneficial effect: 1, system is connected with mesohigh AC power by phase shifting transformer, the electric harmonic produced when effectively reducing system works is to the pollution of electrical network.
2, the rectification circuit of phase shifting transformer rear end is common ground circuit, and the power model that respectively has of multi-phase drive circuit all can realize common ground, and to mechanism structure design, thermal design brings great convenience, and product conveniently can realize the design of system water air-cooled structure.
3, compared with cascaded high-voltage frequency converter, power electronic device in inverter circuit consumes and reduces half, greatly can reduce product cost, meanwhile, the semiconductor PN of every primary Ioops reduces to 2 by 4, effectively can reduce the energy loss of inverter circuit, reach the object of raising efficiency.
4, after motor changes low pressure Specification Design into by high pressure Specification Design, fully can promote stator winding groove utilance, increasing power density, compared with conventional motor, same seat No. can be realized more high-power or with power reduction seat No., thus the material usage greatly reduced under same power, realize energy-saving and emission-reduction.
5, because number of motor phases is many, when polyphase machine lost efficacy because of power electronic device phase, motor still can be made to produce rotating magnetic field, and make system continue to run, be unlikely and cause shutdown.
6, for the heterogeneous frequency changing driving system controlling asynchronous induction machine, by the adjustment of control strategy, realize pole-changing and covert operation, under the prerequisite not increasing motor eddy current loss, improve the speed ratio of system.
Accompanying drawing explanation
Fig. 1 is a kind of topology diagram of the utility model.
Fig. 2 is the another kind of topology diagram of the utility model.
Embodiment
Below in conjunction with Figure of description, the technical solution of the utility model is described in further detail.
Embodiment one: as shown in Figure 1, the utility model comprises phase shifting transformer, rectification circuit, inverter circuit, polyphase machine, the control circuit that is connected with phase shifting transformer, rectification circuit, inverter circuit and polyphase machine, the armature winding of phase shifting transformer is connected with AC power, the secondary winding of phase shifting transformer is connected with rectification circuit, the quantity of secondary winding is identical with the quantity of rectification circuit, one secondary winding is connected with a rectification circuit, be connected to form the DC power supply on common ground between each rectification circuit altogether, the output of rectification circuit is connected with inverter circuit; The quantity of inverter circuit is identical with the number of phases of polyphase machine stator, and an inverter circuit is connected with one end of a motor stator winding, and the other end of motor stator winding is connected to each other and forms heterogeneous star winding.The out-primary for phase shift depressor that system is connected with electrical network end, its secondary winding is several Phase shift winding, according to the number of phases of heterogeneous frequency conversion, is uniformly distributed phase shift angle to Phase shift winding, alleviates electrical network end harmonic pollution; Simultaneously by phase shift transformation, effectively high-voltage fence can be changed into some independently low-voltage three-phase alternating-current supplies, realize the high-low pressure conversion of power-supply system, make the rectification circuit of rear end, inverter circuit, polyphase machine all can by low voltage Specification Design, compare high-voltage motor like this, the insulation thickness of motor winding can be obviously thinning, and radiating effect significantly improves, and the active conductor utilance in motor stator is greatly improved; Through phase shifting transformer transformation Hou Ge road AC power, one_to_one corresponding configures an ac rectifier, and due to phase shift, the amplitude of each road alternating current circuit voltage has fine distinction, makes the direct voltage after rectifying and wave-filtering also have nuance; So the technical program adopts phase shifting transformer, and the DC power supply after rectification independently exists mutually, connects altogether between each rectification circuit.
Wherein: motor can be asynchronous machine or synchronous machine, winding can be flat copper electromagnetic wire formed coil, or sub-thread/multiply enamel-cover circle copper magnet wire.The quantity of rectification circuit is identical with the quantity of inverter circuit, and a rectification circuit is connected with an inverter circuit.Phase shifting transformer is dry-type transformer or oil-immersed type transformer; The armature winding of phase shifting transformer, secondary winding are wye connection, triangular form connection or star/triangle compound connection.Inverter circuit is two level bridge inverter main circuits, three level bridge inverter main circuit or many level bridge inverter main circuit.Rectification circuit is three-phase bridge rectification circuit, and it carries out rectification by diode, controllable silicon or IGBT.
For simplifying line construction, facilitate system water air-cooled structure, inverter circuit and rectification circuit are altogether.
Producing cost to be lowered into, raising the efficiency, polyphase inverter circuit is half-bridge inversion circuit.The semiconductor PN of every primary Ioops is 2, effectively can reduce the energy loss of inverter circuit, reach the object of raising efficiency.
For reduce winding voltage, reduce equipment cost, increase work efficiency, the quantity of inverter circuit, polyphase machine stator winding be more than or equal to 5 integer; The quantity of inverter circuit, polyphase machine stator winding is identical with the quantity of phase shifting transformer secondary winding, rectification circuit.
For realizing controlling, control circuit establishes communication line to detect in real time the operation of phase shifting transformer, rectification circuit, inverter circuit, polyphase machine, drived control, realizes controlling in order, feed back and adjusting.Communication line can be wired or wireless, also can realize long-range control by communication line.
For convenience of monitoring and adjustment System parameter, control circuit establishes man-machine interface with to the operation Real Time Observation of phase shifting transformer, rectification circuit, inverter circuit, polyphase machine and phase sequence control is carried out in the adjustment by control strategy.User is by the operation to man-machine interface, and adjustable control strategy, realizes pole-changing and covert operation, under the prerequisite not increasing motor eddy current loss, improve the speed ratio of system.
Embodiment two:
Be with embodiment one difference:
In order to simplify the structure of phase shifting transformer, when motor phase is abundant, a secondary Phase shift winding can be carried out and provide electric power to multiple unit; As shown in Figure 2, when inverter circuit quantity is the integral multiple of rectification circuit quantity, i.e. n/m=k(natural number), by parallel for the input of every k inverter circuit arbitrarily, form m inverter circuit and joint group, each inverter circuit the input of joint group are connected with the output of each rectification circuit again.
The star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion shown in above Fig. 1,2 is specific embodiment of the utility model; the utility model substantive distinguishing features and progress are embodied; can according to the use needs of reality; under enlightenment of the present utility model; it is carried out to the equivalent modifications of the aspect such as shape, structure, all at the row of the protection range of this programme.
Claims (10)
1. the star-like heterogeneous frequency changing driving system of high-low pressure conversion, comprise phase shifting transformer, rectification circuit, inverter circuit, polyphase machine, with phase shifting transformer, rectification circuit, the control circuit that inverter circuit is connected with polyphase machine, the armature winding of phase shifting transformer is connected with AC power, the secondary winding of phase shifting transformer is connected with rectification circuit, it is characterized in that: the quantity of secondary winding is identical with the quantity of rectification circuit, one secondary winding is connected with a rectification circuit, the DC power supply on common ground is connected to form altogether between each rectification circuit, the output of rectification circuit is connected with inverter circuit.
2. the star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion according to claim 1, it is characterized in that: the quantity of inverter circuit is identical with the number of phases of polyphase machine stator, one inverter circuit is connected with one end of a motor stator winding, and the other end of motor stator winding is connected to each other and forms heterogeneous star winding.
3. the star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion according to claim 2, it is characterized in that: the quantity of rectification circuit is identical with the quantity of inverter circuit, a rectification circuit is connected with an inverter circuit; Or inverter circuit quantity is the integral multiple of rectification circuit quantity, inverter circuit parallel connection forms polyphase inverter circuit in parallel group, and the polyphase inverter quantity in each polyphase inverter circuit in parallel group is identical, and a rectification circuit is connected with an inverter circuit group.
4. the star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion according to claim 1, is characterized in that: described polyphase inverter circuit is half-bridge inversion circuit.
5. the star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion according to claim 2, is characterized in that: the quantity of described inverter circuit, polyphase machine stator winding be more than or equal to 5 integer; The quantity of inverter circuit, polyphase machine stator winding is identical with the quantity of phase shifting transformer secondary winding, rectification circuit or be integral multiple.
6. the star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion according to the arbitrary claim of claim 1-5, it is characterized in that: described control circuit establishes communication line to detect in real time the operation of phase shifting transformer, rectification circuit, inverter circuit, polyphase machine, drived control, realize controlling in order, feed back and adjusting.
7. the star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion according to claim 6, is characterized in that: described control circuit establishes man-machine interface with to the operation Real Time Observation of phase shifting transformer, rectification circuit, inverter circuit, polyphase machine and phase sequence control is carried out in the adjustment by control strategy.
8. the star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion according to the arbitrary claim of claim 1-5, is characterized in that: described rectification circuit is three-phase bridge rectification circuit, and it carries out rectification by diode, controllable silicon or IGBT.
9. the star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion according to the arbitrary claim of claim 1-5, is characterized in that: phase shifting transformer is dry-type transformer or oil-immersed type transformer; The armature winding of phase shifting transformer, secondary winding are wye connection, triangular form connection or star/triangle compound connection.
10. the star-like heterogeneous frequency changing driving system of a kind of high-low pressure conversion according to the arbitrary claim of claim 1-5, is characterized in that: described inverter circuit and rectification circuit are altogether; Described inverter circuit is two level bridge inverter main circuits, three level bridge inverter main circuit or many level bridge inverter main circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520744896.4U CN204906245U (en) | 2015-09-24 | 2015-09-24 | Heterogeneous variable -frequency driving system of high -low pressure conversion star type |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520744896.4U CN204906245U (en) | 2015-09-24 | 2015-09-24 | Heterogeneous variable -frequency driving system of high -low pressure conversion star type |
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| CN204906245U true CN204906245U (en) | 2015-12-23 |
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| CN201520744896.4U Expired - Fee Related CN204906245U (en) | 2015-09-24 | 2015-09-24 | Heterogeneous variable -frequency driving system of high -low pressure conversion star type |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207567A (en) * | 2015-09-24 | 2015-12-30 | 卧龙电气集团股份有限公司 | High-low-voltage converting star type multi-phase variable frequency drive system |
-
2015
- 2015-09-24 CN CN201520744896.4U patent/CN204906245U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207567A (en) * | 2015-09-24 | 2015-12-30 | 卧龙电气集团股份有限公司 | High-low-voltage converting star type multi-phase variable frequency drive system |
| WO2017049859A1 (en) * | 2015-09-24 | 2017-03-30 | 卧龙电气集团股份有限公司 | High/low voltage conversion star-type multiphase variable-frequency driving system |
| US10305409B2 (en) | 2015-09-24 | 2019-05-28 | Wolong Electric Group Co., Ltd. | High-low-voltage conversion star multi-phase variable-frequency drive system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160512 Address after: 312300 Shangyu City, Shaoxing province people's Road West, No. 1801, No. Patentee after: Wolong Electric Group Co., Ltd. Patentee after: Wolong Electrical Group Hangzhou Research Institute Co., Ltd. Address before: 312300 Shangyu City, Shaoxing province people's Road West, No. 1801, No. Patentee before: Wolong Electric Group Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151223 Termination date: 20190924 |