CN111717358A - Double-winding electric propulsion system and ship - Google Patents
Double-winding electric propulsion system and ship Download PDFInfo
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- CN111717358A CN111717358A CN202010497641.8A CN202010497641A CN111717358A CN 111717358 A CN111717358 A CN 111717358A CN 202010497641 A CN202010497641 A CN 202010497641A CN 111717358 A CN111717358 A CN 111717358A
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- winding
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- over switch
- frequency converter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
- B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/22—Multiple windings; Windings for more than three phases
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
Abstract
The embodiment of the invention discloses a duplex winding electric propulsion system and a ship, wherein the propulsion system comprises: the double-winding motor comprises a first frequency converter, a second frequency converter, a switching device and a double-winding motor; the switching device includes: the first change-over switch is electrically connected with the first parallel connection line bank when in an unswitched state, the first change-over switch is electrically connected with the second parallel connection line bank when in a switched state, the second change-over switch is electrically connected with the first parallel connection line bank when in an unswitched state, and the second change-over switch is electrically connected with the second parallel connection line bank when in a switched state; the first parallel connection bank is electrically connected with a first winding of the double-winding motor; the second parallel connection bank is electrically connected with a second winding of the double-winding motor; and a loop interlocking unit is arranged between the first change-over switch and the second change-over switch. The safety and reliability of the propulsion system can be improved, and the optimization cost is low.
Description
Technical Field
The invention relates to the technical field of electric propulsion, in particular to a double-winding electric propulsion system and a ship.
Background
With the continuous development and improvement of the motor speed regulation control technology, at present, some high-grade ships gradually adopt electric variable frequency propulsion as a navigation power system, however, as a system which is crucial in navigation safety, the uninterrupted working state of the propulsion system puts high requirements on the reliability of working circuits of a frequency converter and a propulsion motor, so that the continuous improvement of the reliability of the propulsion system and the reduction of the fault probability become a direction of continuous research.
At present, a double-winding electric propulsion system for a ship adopts a double-frequency-conversion loop to supply power to double windings of a propulsion motor, which means that the failure of a power supply loop of a single frequency converter plus the windings does not lead the propulsion system to be paralyzed, but when the two loops of the system have cross failure, the propulsion function can still be completely disabled, and the requirement of safe port returning can not be met if the electric system is paralyzed, thus bringing hidden troubles for safe and reliable sailing at sea.
Considering the economic cost factor comprehensively, for the solution of the reliability problem, at present, the marine electric propulsion system is mainly realized by a mode that a double-frequency conversion loop supplies power to a double winding of a propulsion motor, and when any loop fails, the propulsion system can still maintain the most basic propulsion capacity. This means that the failure of the power supply circuit of the single frequency converter + winding does not lead to the breakdown of the propulsion system, but the failure of the propulsion function is still caused when the two circuits of the system cross, which brings about a hidden danger for safe and reliable sailing at sea.
Disclosure of Invention
In view of the above problems in the prior art, the embodiments of the present invention provide a dual-winding electric propulsion system and a ship, which can improve the safety and reliability of the propulsion system and optimize the propulsion system at a low cost.
The double-winding electric propulsion system provided by the embodiment of the invention comprises: the double-winding motor comprises a first frequency converter, a second frequency converter, a switching device and a double-winding motor;
wherein the switching device comprises: the first change-over switch is electrically connected with the first parallel connection line bank when in an unswitched state, the first change-over switch is electrically connected with the second parallel connection line bank when in a switched state, the second change-over switch is electrically connected with the first parallel connection line bank when in an unswitched state, and the second change-over switch is electrically connected with the second parallel connection line bank when in a switched state;
the first frequency converter is electrically connected with the first conversion switch;
the second frequency converter is electrically connected with the second change-over switch;
the first parallel connection bank is electrically connected with a first winding of the double-winding motor;
the second parallel connection bank is electrically connected with a second winding of the double-winding motor;
and a loop interlocking unit is arranged between the first change-over switch and the second change-over switch, wherein the loop interlocking unit is used for controlling the loop where the second change-over switch is positioned to be in a power-off state when the first change-over switch is in a switching state, and controlling the loop where the first change-over switch is positioned to be in a power-off state when the second change-over switch is in the switching state.
In some embodiments of the present invention, the loop in which the first transfer switch is located includes the first frequency converter, the first transfer switch, the first parallel connection bank, and the first winding, which are connected in series in this order;
when the first change-over switch is in a switching state, the first frequency converter, the first change-over switch, the second parallel connection bank and the second winding are sequentially connected in series to form a first switching loop.
In some embodiments of the present invention, the loop in which the second transfer switch is located includes the second frequency converter, the second transfer switch, the second parallel connection bank, and the second winding, which are connected in series in sequence;
when the second change-over switch is in a switching state, the second frequency converter, the second change-over switch, the first parallel connection bank and the first winding are sequentially connected in series to form a second switching loop.
In some embodiments of the present invention, the dual winding electric propulsion system further comprises:
the first phase-shifting transformer is sequentially connected with the first frequency converter and the first conversion switch in series;
and the second phase-shifting transformer is sequentially connected with the second frequency converter and the second change-over switch in series.
In some embodiments of the invention, the loop interlock unit comprises:
a mechanical limiting member to limit the first and second switches to be in a switching state simultaneously.
In some embodiments of the present invention, the dual winding in-store propulsion system further comprises:
and the prompting unit is electrically connected with the first frequency converter, the second frequency converter, the first winding and the second winding respectively and is used for prompting when the first frequency converter, the second frequency converter, the first winding and the second winding are electrically connected and have faults.
In some embodiments of the present invention, the dual winding in-store propulsion system further comprises: and the detection unit is in signal connection with the first change-over switch and the second change-over switch, and is used for controlling the second change-over switch to be switched to a switching state when the first frequency converter and the second winding are detected to be in fault, and controlling the first change-over switch to be switched to the switching state when the second frequency converter and the first winding are detected to be in fault.
An embodiment of the present invention further provides a ship, including:
a two-winding in-store propulsion system as described above.
Compared with the prior art, the double-winding in-store propulsion system and the ship provided by the embodiment of the invention have the beneficial effects that: the method adopts a double-frequency-conversion loop to supply power to the double windings of the propulsion motor in the prior art, namely, can maintain the basic propulsion capacity of the propulsion system through the other loop when any loop fails, and can also realize the switching through the switching device when the two loops have cross faults, for example, when the first frequency converter and the second winding have faults, the second frequency converter can be switched to the switching state through switching the second change-over switch in the switching device, so as to realize the electrical connection between the second frequency converter and the first winding and further maintain the basic propulsion capacity of the propulsion system, or when the second frequency converter and the first winding have faults, the first change-over switch in the switching device is switched to the switching state, so as to realize the electrical connection between the first frequency converter and the second winding and further maintain the propulsion capacity of the propulsion system, the safety and reliability of the propulsion system are improved. Meanwhile, the technical scheme related to the embodiment has high feasibility and can be suitable for the existing double-frequency-conversion double-winding electric propulsion system. In addition, the technical scheme provided by the embodiment is adopted to optimize the existing scheme, so that the cost is low, and the popularization and the implementation are convenient.
Drawings
FIG. 1 is a schematic diagram of a prior art dual inverter circuit for powering dual windings of a propulsion motor;
FIG. 2 is a schematic diagram of a temporary emergency lighting device capable of real-time on-off control according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a switching module in the temporary emergency lighting device capable of real-time on-off control according to the embodiment of the present invention to implement circuit control conversion;
fig. 4 is a schematic diagram of a cross fault in a temporary emergency lighting device capable of real-time on-off control according to an embodiment of the present invention.
Reference numerals:
1. a first frequency converter; 2. a second frequency converter; 3. a switching device; 31. a first changeover switch;
32. a second transfer switch; 33. a first parallel connection bank; 34. a second parallel connection bank;
35. an interlock unit; 4. a double winding motor; 41. a first winding; 42. a second winding;
5. a first phase-shifting transformer; 6. a second phase shifting transformer.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Various aspects and features of the present application are described herein with reference to the drawings.
These and other characteristics of the present application will become apparent from the following description of preferred forms of embodiment, given as non-limiting examples, with reference to the attached drawings.
It should also be understood that, although the present application has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of application, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the application, which can be embodied in various forms. Well-known and/or repeated functions and structures have not been described in detail so as to not unnecessarily obscure the present application with unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriately detailed structure.
The specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the application.
An embodiment of the present invention provides a dual-winding electric propulsion system, as shown in fig. 2 to 4, including: the device comprises a first frequency converter 1, a second frequency converter 2, a switching device 3 and a double-winding motor 4; wherein the switching device 3 comprises: a first change-over switch 31, a second change-over switch 32, a first parallel line bank 33 and a second parallel line bank 34, the first change-over switch 31 being electrically connected to the first parallel line bank 33 when in an unswitched state, the first change-over switch 31 being electrically connected to the second parallel line bank 34 when in a switched state, the second change-over switch 32 being electrically connected to the first parallel line bank 33 when in an unswitched state, the second change-over switch 32 being electrically connected to the second parallel line bank 34 when in a switched state; the first inverter 1 is electrically connected to the first changeover switch 31; the second frequency converter 2 is electrically connected with the second change-over switch 32; the first parallel connection bank 33 is electrically connected with the first winding 41 of the double-winding motor 4; the second parallel connection bank 34 is electrically connected to the second winding 42 of the double-winding motor 4; a loop interlock unit 35 is disposed between the first switch 31 and the second switch 32, wherein the loop interlock unit 35 is configured to control the loop in which the second switch 32 is located to be in a power-off state when the first switch 31 is in a switching state, and control the loop in which the first switch 31 is located to be in a power-off state when the second switch 32 is in a switching state.
It can be seen from the above technical solutions that, when the dual-frequency conversion loop is adopted to supply power to the dual windings of the propulsion motor in the prior art, as shown in fig. 1, specifically, on the basis of maintaining the basic propulsion capability of the propulsion system through another loop when any loop fails, it is also possible to realize that the switching device 3 is used to switch when the two loops have a cross failure, and further still maintain the basic propulsion capability of the propulsion system, for example, when the first frequency converter 1 and the second winding 42 have a failure, the second change-over switch 32 in the switching device 3 is switched to the switching state, so as to realize that the second frequency converter 2 is electrically connected with the first winding 41, and further maintain the basic propulsion capability of the propulsion system, or, when the second frequency converter 2 and the first winding 41 have a failure, by switching the first change-over switch in the switching device 3 to the switching state, the first frequency converter 1 and the second winding 42 are electrically connected, so that the propelling capability of the propelling system is maintained, and the safety and reliability of the propelling system are improved. Meanwhile, the technical scheme related to the embodiment has high feasibility and can be suitable for the existing double-frequency-conversion double-winding electric propulsion system. In addition, the technical scheme provided by the embodiment is adopted to optimize the existing scheme, so that the cost is low, and the popularization and the implementation are convenient.
Specifically, in some embodiments of the present invention, the loop in which the first changeover switch 31 is located includes the first frequency converter 1, the first changeover switch 31, the first parallel wiring bank 33, and the first winding 41 connected in series in this order; and when the first change-over switch 31 is in a switching state, the first frequency converter 1, the first change-over switch 31, the second parallel connection bank 34 and the second winding 42 are sequentially connected in series to form a first switching loop.
Meanwhile, in some embodiments of the present invention, the second transfer switch 32 is located in a loop including the second frequency converter 2, the second transfer switch 32, the second parallel connection bank 34, and the second winding 42 connected in series in this order; when the second change-over switch 32 is in the switching state, the second frequency converter 2, the second change-over switch 32, the first parallel connection bank 33 and the first winding 41 are sequentially connected in series to form a second switching loop.
In order to facilitate understanding of the above technical solution, the following detailed description of the above embodiments is made with reference to the accompanying drawings, where there are four cases of a two-fault-point cross fault that may occur in a conventional dual-frequency-conversion dual-winding electric propulsion system, as shown in fig. 4, specifically, a fault failure event a: the first frequency converter 1 and the second frequency converter 2 simultaneously break down; failure time b: the first winding 41 and the second winding 42 fail at the same time; failure event c: the second frequency converter 2 and the first winding 41 fail at the same time; failure event d: the first frequency converter 1 and the second winding 42 fail at the same time; after the switching device 3 is added, if a failure time c occurs, that is, the second frequency converter 2 and the first winding 41 fail at the same time, and the first frequency converter 1 and the second winding 42 are in a normal state, at this time, the first switch 31 of the switching device 3 may be switched to a switching state, at this time, a loop in which the second switch 32 is located is in a power-off state, a power supply object of the first switch 31 is switched from the first winding 41 to the second winding 42, and further, the first frequency converter 1 which does not fail forms a first switching loop through the first switch 31, the second parallel connection bank 34 and the second winding 42, so as to meet a requirement of ensuring basic propulsion capacity of the propulsion system. Similarly, in the event of a failure event d, that is, the first frequency converter 1 and the second winding 42 fail simultaneously, while the second frequency converter 2 and the first winding 41 are in a normal state, the second change-over switch 32 of the switching device 3 may be switched to a switching state, at this time, the loop in which the first change-over switch 31 is located is in a power-off state, and the power supply object of the second change-over switch 32 is switched from the second winding 42 to the first winding 41, so that the second frequency converter 2 that does not fail forms a second switching loop through the second change-over switch 32, the first parallel connection bank 33 and the first winding 41, thereby achieving the requirement of ensuring the basic propulsion capacity of the propulsion system.
From the above analysis, it can be seen that after the switching device 3 is added, there are only two cases of the two-fault-point cross fault, that is, the two cases are reduced from the fault failure event a, the fault failure event b, the fault failure event c and the fault failure event d to the fault failure event a and the fault failure event b, and the corresponding fault failure event c and the fault failure event d cannot cause the system shutdown failure. In the above embodiment, since the failure probability a1 of the first frequency converter 1 of the synchronous system is the same as the failure probability a2 of the second frequency converter 2, and the failure probability B1 of the first winding 41 of the double-winding motor 4 is the same as the failure probability B2 of the second winding 42, and the reliability requirements of the frequency converter and the motor winding in the same loop are similar, that is, the failure probabilities a1 and B1, or a2 and B2, are similar, it can be known that the occurrence probabilities of the failure event a, the failure event B, the failure event c, and the failure event d are approximately the same. Therefore, the cross failure probability of the two fault points of the double-winding propulsion system after the switching device 3 is added can be reduced by about 50%, and the reliability of the propulsion system is greatly improved.
Further, in some embodiments of the present invention, the above-mentioned dual winding electric propulsion system further comprises: the first phase-shifting transformer 5 is sequentially connected with the first frequency converter 1 and the first conversion switch 31 in series, so that the transformation of the power supply voltage is realized; and the second phase-shifting transformer 6 is sequentially connected with the second frequency converter 2 and the second change-over switch 32 in series, so that the transformation of the power supply voltage is realized.
In order to be able to avoid that the first changeover switch 31 and the second changeover switch 32 are in the switching state at the same time, the loop interlock unit 35 includes: a mechanical limiting member to limit the first change-over switch 31 and the second change-over switch 32 to be in the switching state at the same time.
In addition, in order to conveniently and timely switch the first change-over switch 31 or the second change-over switch 32, in some embodiments of the present invention, the dual-winding electric propulsion system further includes: and the prompting unit is electrically connected with the first frequency converter 1, the second frequency converter 2, the first winding 41 and the second winding 42 respectively and is used for prompting when the first frequency converter 1, the second frequency converter 2, the first winding 41 and the second winding 42 are electrically connected and have faults.
In order to enable automatic switching of the first change-over switch 31 and the second change-over switch 32, in some embodiments of the present invention, the dual winding electric propulsion system further comprises: a detection unit, which is in signal connection with the first change-over switch 31 and the second change-over switch 32, for controlling the second change-over switch 32 to switch to a switching state when detecting that the first frequency converter 1 and the second winding 42 are in failure, and for controlling the first change-over switch 31 to switch to a switching state when detecting that the second frequency converter 2 and the first winding 41 are in failure.
An embodiment of the present invention further provides a ship, including:
a two-winding in-store propulsion system as described above.
The double-winding shop propulsion system has all the advantages of the double-winding shop propulsion system, and can still maintain the basic propulsion capacity of the propulsion system by switching the switching device 3 on the basis of the existing double-frequency conversion loop adopted to supply power to the double windings of the propulsion motor, namely, maintaining the basic propulsion capacity of the propulsion system through the other loop when any loop fails, and also can realize that the basic propulsion capacity of the propulsion system is still maintained by switching the second change-over switch 32 in the switching device 3 to the switching state when the two loops have a cross failure, for example, when the first frequency converter 1 and the second winding 42 have a failure, the second frequency converter 2 and the first winding 41 can be electrically connected to maintain the basic propulsion capacity of the propulsion system, or when the second frequency converter 2 and the first winding 41 have a failure, the first change-over switch in the switching device 3 is switched to the switching state, the first frequency converter 1 and the second winding 42 are electrically connected, so that the propelling capability of the propelling system is maintained, and the safety and reliability of the propelling system are improved. Meanwhile, the technical scheme related to the embodiment has high feasibility and can be suitable for the existing double-frequency-conversion double-winding electric propulsion system. In addition, the technical scheme provided by the embodiment is adopted to optimize the existing scheme, so that the cost is low, and the popularization and the implementation are convenient.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (8)
1. A dual winding electric propulsion system, comprising: the double-winding motor comprises a first frequency converter, a second frequency converter, a switching device and a double-winding motor;
wherein the switching device comprises: the first change-over switch is electrically connected with the first parallel connection line bank when in an unswitched state, the first change-over switch is electrically connected with the second parallel connection line bank when in a switched state, the second change-over switch is electrically connected with the first parallel connection line bank when in an unswitched state, and the second change-over switch is electrically connected with the second parallel connection line bank when in a switched state;
the first frequency converter is electrically connected with the first conversion switch;
the second frequency converter is electrically connected with the second change-over switch;
the first parallel connection bank is electrically connected with a first winding of the double-winding motor;
the second parallel connection bank is electrically connected with a second winding of the double-winding motor;
and a loop interlocking unit is arranged between the first change-over switch and the second change-over switch, wherein the loop interlocking unit is used for controlling the loop where the second change-over switch is positioned to be in a power-off state when the first change-over switch is in a switching state, and controlling the loop where the first change-over switch is positioned to be in a power-off state when the second change-over switch is in the switching state.
2. A twin winding electric propulsion system as in claim 1 wherein the first transfer switch is in a circuit comprising the first frequency converter, the first transfer switch, the first parallel bank and the first winding connected in series in that order;
when the first change-over switch is in a switching state, the first frequency converter, the first change-over switch, the second parallel connection bank and the second winding are sequentially connected in series to form a first switching loop.
3. A twin winding electric propulsion system as claimed in claim 1 in which the second transfer switch is in a circuit comprising the second frequency converter, the second transfer switch, the second parallel bank and the second winding connected in series in that order;
when the second change-over switch is in a switching state, the second frequency converter, the second change-over switch, the first parallel connection bank and the first winding are sequentially connected in series to form a second switching loop.
4. The dual winding electric propulsion system of claim 1, further comprising:
the first phase-shifting transformer is sequentially connected with the first frequency converter and the first conversion switch in series;
and the second phase-shifting transformer is sequentially connected with the second frequency converter and the second change-over switch in series.
5. The dual winding electric propulsion system of claim 1, wherein the loop interlock unit comprises:
a mechanical limiting member to limit the first and second switches to be in a switching state simultaneously.
6. The dual winding electric propulsion system of claim 1, further comprising:
and the prompting unit is electrically connected with the first frequency converter, the second frequency converter, the first winding and the second winding respectively and is used for prompting when the first frequency converter, the second frequency converter, the first winding and the second winding are electrically connected and have faults.
7. The dual winding electric propulsion system of claim 1, further comprising: and the detection unit is in signal connection with the first change-over switch and the second change-over switch, and is used for controlling the second change-over switch to be switched to a switching state when the first frequency converter and the second winding are detected to be in fault, and controlling the first change-over switch to be switched to the switching state when the second frequency converter and the first winding are detected to be in fault.
8. A marine vessel, comprising:
a twin winding electric propulsion system as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010497641.8A CN111717358A (en) | 2020-06-04 | 2020-06-04 | Double-winding electric propulsion system and ship |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010497641.8A CN111717358A (en) | 2020-06-04 | 2020-06-04 | Double-winding electric propulsion system and ship |
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Application publication date: 20200929 |
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| RJ01 | Rejection of invention patent application after publication |