CN109767902B - High-power high-frequency rotating power electronic transformer - Google Patents
High-power high-frequency rotating power electronic transformer Download PDFInfo
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- CN109767902B CN109767902B CN201910084337.8A CN201910084337A CN109767902B CN 109767902 B CN109767902 B CN 109767902B CN 201910084337 A CN201910084337 A CN 201910084337A CN 109767902 B CN109767902 B CN 109767902B
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Abstract
The invention discloses a high-power high-frequency rotating power electronic transformer which comprises a rotating assembly, a fixed assembly, a DC-AC converter and an AC-DC converter. The rotating assembly is coaxially and fixedly sleeved on a motor rotating shaft and comprises a rotating magnetic ring and a rotating winding; the fixed assembly is fixed in position and comprises a fixed magnetic ring and a fixed winding; a fixed air gap is formed between the fixed assembly and the rotating assembly; the DC-AC converter comprises a first H bridge which is electrically connected with the fixed winding; the AC-DC converter includes a second H-bridge. The stationary winding and the rotating winding are coupled through a stationary air gap to wirelessly transmit alternating current AC on the stationary winding to the rotating winding. The invention transmits high-power energy to the rotating part through the fixing part and supplies power to the rotor of the motor through the rotating part, thereby realizing flexible energy transmission and simple physical maintenance, thereby replacing the existing carbon brush slip ring mechanism and being widely applied to the transformation of the existing carbon brush slip ring mechanism and the processing of new transmission equipment.
Description
Technical Field
The invention relates to a power electronic transformer, in particular to a high-power high-frequency rotating power electronic transformer.
Background
In most cases, the existing electric transmission equipment such as direct current motors, electrically excited synchronous motors, wound rotor asynchronous motors (especially double-fed motors), electromagnetic clutches and the like need to be powered by rotors.
The existing rotor power supply mode has the following modes:
1. power supply of the rotary transformer: the mode that adopts traditional resolver to carry out the rotor power supply, the resolver that needs often is bulky, and the control of rotor part is more difficult. Thus, the manner in which the rotary transformer supplies power has not been widely popularized.
2. Brushless power supply: the brushless mode of adopting two stator windings, the structure is complicated, and needs complicated accent magnetism. Therefore, the brushless power supply method has not been widely popularized.
3. The carbon brush (or commutator) slip ring mechanism supplies power: the rotor power supply device is used in the Faraday period and still serves as a main rotor power supply mode at present. However, carbon brush slip ring mechanisms have significant drawbacks. For example, a shutdown accident caused by a carbon brush or rotor collecting ring fault can cause great economic loss to enterprises. In addition, when a failure occurs during the operation of the carbon brush to which the lead-out current is introduced, it is difficult to determine the type and nature of the failure.
Therefore, it is very important to develop a power supply method capable of replacing a carbon brush (or commutator) slip ring mechanism.
With the rapid development of power electronic technologies such as power silicon carbide in recent decades, high-frequency power electronic transformers have attracted much attention in recent decades.
Meanwhile, wireless power transmission is rapidly developed, non-contact power transmission is researched greatly, and efficiency is higher and higher.
The invention combines the principles of electromagnetic, power electronic and wireless energy transmission, provides a high-power energy transmission device for energy transmission between a fixed part and a rotating part, can replace a carbon brush slip ring mechanism, realizes flexible energy transmission and can realize simple physical maintenance. The carbon brush slip ring mechanism can be used for electric transmission equipment needing energy transmission between a fixed part and a rotating part, and is widely used for transformation of the existing carbon brush slip ring mechanism and processing of new transmission equipment.
Disclosure of Invention
The invention provides a high-power high-frequency rotating power electronic transformer, aiming at the defects of the prior art, the high-power high-frequency rotating power electronic transformer transmits high-power energy to a rotating part through a fixed part, and supplies power to a rotor of a motor through the rotating part, realizes flexible energy transmission, and can realize simple physical maintenance, thereby replacing the existing carbon brush slip ring mechanism, and being widely applied to the transformation of the existing carbon brush slip ring mechanism and the processing of new transmission equipment.
In order to solve the technical problems, the invention adopts the technical scheme that:
a high-power high-frequency rotating power electronic transformer comprises a rotating assembly, a fixed assembly, a DC-AC converter and an AC-DC converter.
The rotating component is coaxially and fixedly sleeved on the motor rotating shaft and synchronously rotates along with the motor rotating shaft; the rotating assembly comprises a rotating magnetic ring and a rotating winding arranged in the rotating magnetic ring.
The fixed component is coaxially sleeved on the periphery of the rotating component and is fixed in position; the fixed assembly comprises a fixed magnetic ring and a fixed winding arranged in the fixed magnetic ring.
A fixed air gap is arranged between the fixed component and the rotating component.
The DC-AC converter is fixed in position and includes a first H-bridge electrically connected to the stationary winding to form a DC-AC conversion circuit.
The AC-DC converter can synchronously rotate with the rotating shaft of the motor, and comprises a second H bridge which is electrically connected with the rotating winding to form an AC-DC conversion circuit.
The DC-AC conversion circuit is used to convert the input direct current DC into alternating current AC which is applied to the stationary winding.
The fixed assembly and the rotating assembly form a high-frequency rotary transformer, and in the rotating process of the rotating assembly, the fixed winding and the rotating winding are coupled through a fixed air gap and a magnetic circuit is kept unchanged, so that Alternating Current (AC) on the fixed winding is wirelessly transmitted to the rotating winding in the rotating assembly.
The AC-DC conversion circuit converts alternating current AC wirelessly received by the rotating winding into direct current DC, and applies the DC to the motor rotor.
The DC-AC converter further comprises a first inductor which is electrically connected with the first H bridge after being connected with the fixed winding in series.
The DC-AC converter also comprises a first capacitor, and the first capacitor, the first inductor and the fixed winding are sequentially connected in series and then electrically connected with the first H bridge.
The DC-AC converter also comprises a first capacitor, wherein the first inductor is connected with the fixed winding in series, and then is connected with the first capacitor in parallel and then is electrically connected with the first H bridge.
The AC-DC converter also comprises a second inductor which is electrically connected with the second H bridge after being connected with the rotating winding in series.
The AC-DC converter also comprises a second capacitor, and the second capacitor, a second inductor and the rotating winding are sequentially connected in series and then electrically connected with the second H bridge.
The AC-DC converter also comprises a second capacitor, and the second inductor is connected with the rotating winding in series, is connected with the second capacitor in parallel and is electrically connected with the second H bridge.
The rotating magnetic ring and the fixed magnetic ring are both groove rings, the opening directions of the grooves are opposite, the fixed winding is wound in the groove in the fixed magnetic ring in the circumferential direction, and the rotating winding is wound in the groove in the rotating magnetic ring in the circumferential direction.
The rotating magnetic ring and the fixed magnetic ring are both groove rings, and the opening directions of the grooves are opposite.
The side surface of the groove of the rotating magnetic ring is provided with a plurality of winding holes, and the rotating winding is wound on the side surface of the groove of the rotating magnetic ring through the winding holes; the side surface of the groove of the fixed magnetic ring is provided with a plurality of winding holes, and the fixed winding is wound on the side surface of the groove of the fixed magnetic ring through the winding holes.
The rotating magnetic rings and the fixed magnetic rings are provided with a plurality of groups, each group of rotating magnetic rings and each group of fixed magnetic rings are sequentially coaxially sleeved on the periphery of the motor rotating shaft from inside to outside, and a fixed air gap is formed between each group of rotating magnetic rings and each group of fixed magnetic rings; the multiple groups of rotating windings and the multiple groups of fixed windings can be connected in series and parallel as required, and wireless transmission of high-power energy is realized.
The invention has the following beneficial effects:
1. the fixed assembly and the rotating assembly are the magnetic circuit parts of the invention, which form a high-frequency rotary transformer, and because a fixed air gap is arranged between the fixed assembly and the rotating assembly, the wireless transmission of energy between the fixed assembly and the rotating assembly can be realized. In addition, the fixed air gap is small, so that high-power wireless power transmission can be realized, and the function of an electric brush slip ring mechanism in the existing transmission mechanism can be replaced.
2. The DC-AC converter and the AC-DC converter in the invention can directly adopt a direct current bus, can flexibly realize the alternating current of energy, can also realize the arrangement of a plurality of groups and flexible series-parallel connection, and finally realize the wireless transmission of high power energy and small air gap.
3. The high-frequency H bridge can realize phase shift control, flexibly adjust DC voltage of buses on the DC-AC converter and the AC-DC converter, realize flexible connection with other electrical circuit interfaces and facilitate control of other components.
Drawings
Fig. 1 shows a schematic structural diagram of a high power high frequency rotary power electronic transformer with windings arranged in slots.
Fig. 2 shows a sectional view of the structure of fig. 1 in the axial direction.
Five preferred circuit topologies are shown in fig. 3 (a) - (e).
Fig. 4 shows a construction diagram of a high power high frequency rotary power electronic transformer with windings arranged on the sides of the slots.
Fig. 5 shows a sectional view of the structure of fig. 4 in the axial direction.
Fig. 6 shows a side view along fig. 4.
Figure 7 shows multiple sets of the arrangement of figure 1 juxtaposed in the axial direction.
Figure 8 shows multiple sets of the arrangement of figure 4 juxtaposed in the axial direction.
Among them are:
1. a motor shaft;
2. a rotating assembly; 21. rotating the magnetic ring; 22. rotating the winding;
3. a fixing assembly; 31. fixing a magnetic ring; 32. fixing the winding;
4. a DC-AC converter;
H1. a first H bridge; S1-S4 power electronic power switch; l1, first inductance; C1. a first capacitor;
5. an AC-DC converter;
H2. a second H bridge; S5-S8 power electronic power switch; l2, second inductance; C2. a second capacitor;
t. magnetic circuit AC-AC;
6. the air gap is fixed.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As shown in fig. 1, the high-power high-frequency rotating power electronic transformer comprises a rotating assembly 2, a fixed assembly 3, a DC-AC converter 4 and an AC-DC converter 5.
The rotating component is coaxially fixedly sleeved on the motor rotating shaft 1, preferably sleeved at the position of a slip ring in the existing brush slip ring mechanism, and can synchronously rotate along with the motor rotating shaft.
The rotating assembly comprises a rotating magnetic ring 21 and a rotating winding 22 arranged in the rotating magnetic ring.
The fixed component is coaxially sleeved on the periphery of the rotating component and is fixed in position, such as fixed on the inner wall of the motor shell. The fixed assembly comprises a fixed magnetic ring 31 and a fixed winding 32 arranged in the fixed magnetic ring.
The rotating magnetic ring and the fixed magnetic ring are preferably made of magnetic materials such as ferrite or anisotropic magnetic lamination materials such as amorphous alloy.
The above-described rotating winding and fixed winding preferably have the following two winding manners.
Winding method 1
As shown in fig. 1 and 2, the rotating magnetic ring and the fixed magnetic ring are both groove rings, and the opening directions of the grooves are opposite, the fixed winding is circumferentially wound in the groove in the fixed magnetic ring, and the rotating winding is circumferentially wound in the groove in the rotating magnetic ring.
Winding method 2
As shown in fig. 4 and 5, the rotating magnetic ring and the fixed magnetic ring are both groove rings, and the opening directions of the grooves are opposite. The side surface of the groove of the rotating magnetic ring is provided with a plurality of winding holes, and the rotating winding is wound on the side surface of the groove of the rotating magnetic ring through the winding holes; the side surface of the groove of the fixed magnetic ring is provided with a plurality of winding holes, and the fixed winding is wound on the side surface of the groove of the fixed magnetic ring through the winding holes.
A small fixed air gap 6 is arranged between the fixed component and the rotating component, and the radial thickness of the fixed air gap is generally 0.1-2 mm.
The DC-AC converter is fixed in position, preferably in fixed connection with the fixing assembly, and may also be fixed to the motor housing.
As shown in fig. 3, the DC-AC converter has several preferred embodiments as follows.
Example 1
The DC-AC converter includes a first H-bridge H1 electrically connected to the stationary winding to form a DC-AC conversion circuit.
Example 2
As shown in fig. 3 (d), the DC-AC converter includes a first H-bridge H1 and a first inductor L1, which is electrically connected to the first H-bridge after being connected in series with the fixed winding.
Example 3
As shown in fig. 3 (a) and 3 (b), the DC-AC converter includes a first H-bridge H1, a first inductor L1, and a first capacitor C1, and the first capacitor, the first inductor, and the fixed winding are sequentially connected in series and then electrically connected to the first H-bridge.
Example 4
As shown in fig. 3 (C) and 3 (e), the DC-AC converter includes a first H-bridge H1, a first inductor L1, and a first capacitor C1, where the first inductor is connected in series with the fixed winding, connected in parallel with the first capacitor, and electrically connected to the first H-bridge.
The AC-DC converter can rotate synchronously with the motor shaft, and is preferably fixed to the motor shaft or a rotating member synchronous with the motor shaft.
As shown in fig. 3, the AC-DC converter also has several preferred embodiments as follows.
Example 1
As shown in fig. 3 (b), 3 (d) and 3 (e), the AC-DC converter includes a second H bridge H2 electrically connected to the rotating winding to form an AC-DC conversion circuit.
Example 2
The AC-DC converter comprises a second H bridge H2 and a second inductor L2, and the second inductor is electrically connected with the second H bridge after being connected with the rotating winding in series.
Example 3
As shown in fig. 3 (a), the AC-DC converter includes a second H-bridge H2, a second inductor L2, and a second capacitor C2, and the second capacitor, the second inductor, and the rotating winding are sequentially connected in series and then electrically connected to the second H-bridge.
Example 4
As shown in fig. 3 (C), the AC-DC converter includes a second H-bridge H2, a second inductor L2, and a second capacitor C2, and the second inductor is connected in series with the rotating winding, connected in parallel with the second capacitor, and electrically connected to the second H-bridge.
The combination mode of the first inductor (L1), the first capacitor (C1) and the second inductor (L2), the second capacitor (C2) can be matched arbitrarily, and 9 combinations can be formed.
The circuit portion constituted by the DC-AC converter 4 and the AC-DC converter 5 preferably has the following five modes.
First preferred embodiment
As shown in fig. 3 (a), the DC-AC converter employs embodiment 3, and the AC-DC converter employs embodiment 3.
Second preferred embodiment
As shown in fig. 3 (b), the DC-AC converter employs embodiment 3, and the AC-DC converter employs embodiment 1.
Third preferred embodiment
As shown in fig. 3 (c), the DC-AC converter employs embodiment 4, and the AC-DC converter employs embodiment 4.
Fourth preferred embodiment
As shown in fig. 3 (d), the DC-AC converter employs embodiment 2, and the AC-DC converter employs embodiment 1.
Fifth preferred embodiment
As shown in fig. 3 (e), the DC-AC converter employs embodiment 4, and the AC-DC converter employs embodiment 1.
The power semiconductor switches S1-S8 of the H bridge can be selected from power electronic devices such as IGBTs, MOSFETs, SiC-MOSFETs and the like and corresponding absorption circuits.
The working principle of the high-power high-frequency rotating power electronic transformer is as follows:
1. DC-AC conversion
The DC-AC conversion circuit is used to convert the input DC into AC, which is applied to the stationary winding. The method specifically comprises the following steps: the DC part of the DC-AC conversion circuit is provided by a direct current source or an alternating current source, is provided by rectification and filtering, and is converted into an AC connection fixed winding after being inverted by a first H bridge H1.
2. AC-AC energy wireless transmission
The fixed assembly and the rotating assembly form a high-frequency rotary transformer, in the rotating process of the rotating assembly, the fixed winding and the rotating winding realize electromagnetic coupling through a fixed air gap and keep a magnetic circuit unchanged, and therefore Alternating Current (AC) on the fixed winding is wirelessly transmitted to the rotating winding in the rotating assembly.
Namely: alternating current AC is generated in the rotating winding through the stationary magnetic ring and the rotating magnetic ring.
3. AC-DC conversion
The AC-DC conversion circuit converts alternating current AC wirelessly received by the rotating winding into direct current DC, and applies the DC to the motor rotor. The method specifically comprises the following steps: alternating Current (AC) wirelessly received by the rotating winding is rectified into DC through a second H bridge H2 in the AC-DC exchanger.
The invention can also be expanded with the following functions: as shown in fig. 6 and 7, the rotating magnetic rings and the fixed magnetic rings are provided with a plurality of groups, each group of rotating magnetic rings and each group of fixed magnetic rings are sequentially coaxially sleeved on the periphery of the motor rotating shaft from inside to outside, and a fixed air gap is formed between each group of rotating magnetic rings and each group of fixed magnetic rings; the multiple groups of rotating windings and the multiple groups of fixed windings can be connected in series and parallel as required, and wireless transmission of high-power energy is realized.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (6)
1. A high-power high-frequency rotating power electronic transformer is characterized in that: the device comprises a rotating component, a fixed component, a DC-AC converter and an AC-DC converter;
the rotating component is coaxially and fixedly sleeved on the motor rotating shaft and synchronously rotates along with the motor rotating shaft; the rotating assembly comprises a rotating magnetic ring and a rotating winding arranged in the rotating magnetic ring;
the fixed component is coaxially sleeved on the periphery of the rotating component and is fixed in position; the fixed assembly comprises a fixed magnetic ring and a fixed winding arranged in the fixed magnetic ring;
a fixed air gap is arranged between the fixed component and the rotating component, and the radial thickness of the fixed air gap is 0.1-2 mm;
the DC-AC converter is fixed in position and comprises a first H bridge and a first inductor, and the first inductor is electrically connected with the first H bridge after being connected with the fixed winding in series to form a DC-AC conversion circuit;
the AC-DC converter can synchronously rotate with a rotating shaft of the motor, the AC-DC converter comprises a second H bridge and a second inductor, and the second inductor is electrically connected with the second H bridge after being connected with the rotating winding in series to form an AC-DC conversion circuit;
the DC-AC conversion circuit is used for converting input direct current DC into alternating current AC and applying the alternating current AC to the fixed winding;
the fixed assembly and the rotating assembly form a high-frequency rotary transformer, and in the rotating process of the rotating assembly, the fixed winding and the rotating winding are coupled through a fixed air gap and a magnetic circuit is kept unchanged, so that Alternating Current (AC) on the fixed winding is wirelessly transmitted to the rotating winding in the rotating assembly;
the AC-DC conversion circuit converts alternating current AC wirelessly received by the rotating winding into direct current DC and applies the direct current DC to the motor rotor;
the first H bridge and the second H bridge realize phase shift control and can flexibly adjust the DC voltage of the DC-AC converter and the DC voltage of the bus of the AC-DC converter;
the rotating magnetic ring and the fixed magnetic ring are both groove rings, and the opening directions of the grooves are opposite;
the side surface of the groove of the rotating magnetic ring is provided with a plurality of closed winding holes, and the rotating winding is wound on the side surface of the groove of the rotating magnetic ring through the winding holes; the side face of the groove of the fixed magnetic ring is provided with a plurality of other closed winding holes, and the fixed winding is wound on the side face of the groove of the fixed magnetic ring through the winding holes.
2. The high power high frequency rotary power electronic transformer of claim 1, characterized in that: the DC-AC converter also comprises a first capacitor, and the first capacitor, the first inductor and the fixed winding are sequentially connected in series and then electrically connected with the first H bridge.
3. The high power high frequency rotary power electronic transformer of claim 1, characterized in that: the DC-AC converter also comprises a first capacitor, wherein the first inductor is connected with the fixed winding in series, and then is connected with the first capacitor in parallel and then is electrically connected with the first H bridge.
4. The high power high frequency rotary power electronic transformer according to any one of claims 1 to 3, characterized in that: the AC-DC converter also comprises a second capacitor, and the second capacitor, a second inductor and the rotating winding are sequentially connected in series and then electrically connected with the second H bridge.
5. The high power high frequency rotary power electronic transformer according to any one of claims 1 to 3, characterized in that: the AC-DC converter also comprises a second capacitor, and the second inductor is connected with the rotating winding in series, is connected with the second capacitor in parallel and is electrically connected with the second H bridge.
6. The high power high frequency rotary power electronic transformer of claim 1, characterized in that: the rotating magnetic rings and the fixed magnetic rings are provided with a plurality of groups, each group of rotating magnetic rings and each group of fixed magnetic rings are sequentially coaxially sleeved on the periphery of the motor rotating shaft from inside to outside, and a fixed air gap is formed between each group of rotating magnetic rings and each group of fixed magnetic rings; the multiple groups of rotating windings and the multiple groups of fixed windings can be connected in series and parallel as required, and wireless transmission of high-power energy is realized.
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| CN201910084337.8A CN109767902B (en) | 2019-01-29 | 2019-01-29 | High-power high-frequency rotating power electronic transformer |
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| CN201910084337.8A CN109767902B (en) | 2019-01-29 | 2019-01-29 | High-power high-frequency rotating power electronic transformer |
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| CN111525864B (en) * | 2019-07-09 | 2021-11-09 | 河海大学 | Operation control method of four-quadrant operation electromagnetic clutch |
| CN113098142A (en) * | 2019-12-23 | 2021-07-09 | 深圳市速腾聚创科技有限公司 | Mechanical rotation type laser radar power supply circuit, laser radar |
| CN111554494B (en) * | 2020-04-29 | 2021-07-30 | 河海大学 | Rotary magnetic coupling transformer based on magnetic integration |
| CN111817449B (en) * | 2020-06-28 | 2021-11-16 | 河海大学 | Wireless power supply system for motor rotor |
| CN111968842B (en) * | 2020-08-20 | 2021-12-28 | 沈阳工业大学 | Rotary loose coupling transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003257757A (en) * | 2002-02-28 | 2003-09-12 | Toko Inc | Transformer of non-contact charger |
| CN102802527B (en) * | 2009-06-11 | 2015-06-17 | 皇家飞利浦电子股份有限公司 | Contactless power chain |
| US8542085B2 (en) * | 2011-02-28 | 2013-09-24 | GM Global Technology Operations LLC | High frequency rotary transformer for synchronous electrical machines |
| FR2990557B1 (en) * | 2012-05-10 | 2015-05-01 | Hispano Suiza Sa | THREE-PHASE MAGNETICALLY LEVER TRANSFORMER |
| CN204168145U (en) * | 2014-11-18 | 2015-02-18 | 哈尔滨理工大学 | A kind of contactless energy transmission system based on nested structure transformer |
| CN106452133B (en) * | 2016-09-27 | 2019-06-25 | 河南理工大学 | A kind of core current transformer and its control method constructing bipolarity direct-current micro-grid |
| CN107658996A (en) * | 2017-11-16 | 2018-02-02 | 中国电子科技集团公司第三十八研究所 | A kind of rotary non-contact electric energy transmission device |
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