CN203747699U - Reduction gearbox-based superconductive direct-current induction heating motor starting device - Google Patents
Reduction gearbox-based superconductive direct-current induction heating motor starting device Download PDFInfo
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- CN203747699U CN203747699U CN201420070078.6U CN201420070078U CN203747699U CN 203747699 U CN203747699 U CN 203747699U CN 201420070078 U CN201420070078 U CN 201420070078U CN 203747699 U CN203747699 U CN 203747699U
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Abstract
The utility model discloses a reduction gearbox-based superconductive direct-current induction heating motor starting device comprising a master motor system and an auxiliary starting system. The master motor system and the auxiliary starting system are respectively connected with a load spindle. The auxiliary starting system includes a reduction gearbox starting module; the reduction gearbox starting module consists of a reduction gearbox clutch, a reduction gearbox and a helper motor; the load spindle is connected with the reduction gearbox by the reduction gearbox clutch; the reduction gearbox is connected with the helper motor; and the load spindle and the reduction gearbox clutch can be separated from each other. With the device, a problem that the starting obstacle is caused when the torque peak value exceeds the motor torque overload capacity during the existing starting process can be successfully solved; the performance of the master motor system can be fully realized; the manufacturing cost of the industrial superconductive direct-current induction heater driving system as well as the equipment manufacturing cost can be lowered; and the positive effects can be brought to the commercial potential and the market competitiveness of the device.
Description
Technical field
The utility model relates to induction heating technique field, specifically a kind of direct supercurrent induction heating motor starting device based on reduction box.
Background technology
Induction heating is a kind of mode of heating based on faraday-Lenz electromagnetic induction principle, have fast, clean, be convenient to carry out surface and localized heating and the advantage such as energy-conservation in most of the cases.From the twenties in 20th century, start to introduce the alternating current impression heating that utilizes electromagnetic eddy heating abroad, recent year also progressively adopts.Traditional alternating current impression mode of heating, its operation principle is: allow alternating current pass through to produce alternating magnetic field by the coil of water-cooled copper coiling, thereby make the spindle internal cause electromagnetic induction principle that is arranged in coil produce eddy current, eddy current mobile Joule heat that produces in spindle adds thermal material.Now, the electrical loss water that is cooled that copper coil resistance produces is taken out of, as shown in Figure 1.
Current this induction heating technique has two main technical bottlenecks: the one, and the efficiency of heating surface, this kind of heating means are for ferrimagnet, can obtain the very high efficiency of heating surface, but when adopting while heating in this way the less nonmagnetic material of aluminium, copper constant resistance rate, because the ohmic loss of coil obviously increases and makes the electrical efficiency of heater become very low, be only 50%-60%, cause huge energy loss, and be limited by the characteristic of the method itself, its efficiency has been difficult to have significantly promote again; The 2nd, heating accuracy, conventional AC induction heating equipment can only carry out temperature Synchronous Heating to the limited and minimum degree of depth of aluminium shape surface, mostly by material self heat, conduction realizes in the heating in darker region, so the section bar depth part temperature difference is large, in follow-up extruding with add and not only can cause man-hour the local soft or hard of material to differ, thereby cause the defects such as micro-crack, and the outside waste that has also caused the energy than inner high remaining temperature out; In the situation that heating accuracy is had relatively high expectations, the method is difficult to meet user's requirement, and improves heat penetration, obtains heating effect more uniformly, has very important meaning for the manufacture of modern high end shape (as aluminium section bar); Conventional AC induction heating method mainly improves heat penetration by the method for frequency reducing, and the large-scale alternating current impression firing equipment of main flow mostly adopts power frequency now.Further reduce the frequency raising induction heating degree of depth manufacture of modern shape is meant a great, but it faces technological challenge and manufacturing cost pressure is very huge, so the induction heating equipment of modern large-scale main flow stops at power frequency mostly.
Thus, direct supercurrent induction heating becomes the important research direction of current induction heating.The operation principle of direct supercurrent induction heating is, allow direct current produce strong dc magnetic field by the magnet being formed by superconducting coil and to allow motor drive aluminium ingot or copper ingot in this D.C. magnetic field, to rotate (being conductor cutting magnetic line), thereby in spindle, form eddy current and and then produce Joule heat heating spindle, as shown in Figure 2.In running, the mechanical energy of motor output converts the electric energy in spindle to by electromagnetic induction, and then is converted to heat energy by electric thermal effect, and along with the increase of number of revolutions, the temperature of spindle will continue to raise.So the heat energy of spindle almost all derives from the mechanical energy of motor output; And simultaneously owing to adopting direct current, in superconducting coil, there is hardly energy loss, even if consider the power that refrigerating system consumes, it is than heating power also very little, so the efficiency of whole firing equipment depends primarily on the efficiency of motor.The operational efficiency that existing motor manufacturing technology makes motor height very, conventionally can reach more than 90%, so, than conventional AC induction heating technique, concerning the efficiency of heating surface of the low-resistivity such as aluminium, copper nonferromugnetic material, direct supercurrent induction heating technique can significantly improve the efficiency of heating surface.Meanwhile, for the spindle of certain specification, its heat penetration depends primarily on rotating speed, and rotating speed is lower, and heat penetration is larger.The rotating speed of spindle is controlled by motor, thereby can improve heat penetration by the rotating speed that reduces motor.So than conventional AC induction heater, direct supercurrent induction heater is having very significantly advantage aspect the efficiency of heating surface and heating uniformity.
Find through retrieval, in " Commercial Induction Heaters With High-Temperature Superconductor Coi1s " literary composition that the people such as Magne Runde deliver on " IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY ", mention: southern US San Francisco Zenergy Power company provides a direct current induction heating equipment for a German aluminium extrusion company.As shown in Figure 3, this device is made up of superconducting magnet, refrigerating plant, heating chamber and four major parts of motor.A little chest that commercially available refrigerator is housed is arranged at the top of magnet, for magnet provides low temperature environment.The D.C. magnetic field that magnet produces penetrates in two heat insulation heating chambers, and spindle rotates therein.The motor at spindle two ends provides rotary power, and these motors can slide to adapt to the spindle of different length.Motor is equipped with flange does not make it produce any infringement or distortion to clamp when rotated spindle.Superconducting magnet is fastened in very solid box hat.
Chinese Patent Application No.: 200880112972.2, patent name: the method for induction heating metal works.This patent readme is: a kind ofly rotate described metal works induction heating is to the distinguishing characteristics of the method for desired temperature with respect to the D.C. magnetic field that penetrates this workpiece by making metal works, described workpiece is clamped at and is suitable for around between two jaws of coaxial rotation, at least one in described jaw is driven in rotation, at least one in described jaw is suitable for along or is parallel to described rotating shaft being initiatively shifted, the contact force of at least one in described jaw is adjusted, and at least one mechanical parameter of temperature that represents described workpiece is measured compares as actual value and with the desired value of desired temperature described in the representative of this mechanical parameter.
Chinese Patent Application No.: 200880100217.2, patent name: induction heater.This patent readme is: a kind of induction heater for heating of metal spindle, it has the yoke of E tee section, on the medial fascicle of described yoke, be provided with superconducting coil, described induction heater has the trap between each in described medial fascicle and two lateral branches separately.Can be by making rotation in each in two traps of spindle heat this spindle.
Chinese Patent Application No.: 200880100216.8, patent name: induction heating method.This patent readme is: at the spindle by making electric conducting material with respect to carried magnetic field rotating that galvanic superconduction winding produces by least one on iron core described in induction heating during spindle, can reduce reverse induction voltage by producing and maintain D. C. value in described winding, this D. C. value is in described iron core, at least in the region of described winding, produce such magnetic flux density, under this magnetic flux density, the relative permeability of the material of described iron core is than low in the time of the zero current condition of described winding.
For the above-mentioned direct current induction heating method based on rotary spindle inductive loop, drive motors is very crucial parts.The type selecting of drive motors must meet two conditions: the one, and power output can meet the needs of whole heating process, and the 2nd, output torque can meet the needs of whole heating process.Practice and calculating all show, for larger-diameter spindle (as blank aluminium bar used in Large size Aluminium goods extrusion process enterprise, its bore is conventionally more than 200mm), under a certain definite magnetic field, adopting direct current induction heating method, there is with the variation of rotating speed the trend being illustrated in fig. 3 shown below in the induction heating power in spindle and reverse induction electromagnetic torque.Spindle in this figure is certain non-ferromagnetic metal spindle of diameter 300mm.This figure presents following two principal characters: the first, and induced power increases with the increase of rotating speed; The second, oppositely electromagnetic torque, when rotating ratio is lower, increases with the increase of rotating speed, reaches after certain peak value, reduces again with the increase of rotating speed.In actual commercial Application, the main heating period of spindle, its rotating speed of living in interval is conventionally much larger than the corresponding rotating speed of reverse electromagnetic torque peak value, so, in each heating cycle, the peak point that the start-up course of drive motors occurs must cross the reverse electromagnetic torque slow-speed of revolution of spindle time,, in start-up course, the output torque of drive motors will possess the ability of crossing this load peak point., mainly heat the period at spindle, on spindle, respond to the reverse electromagnetic torque producing much smaller than peak torque thereafter, conventionally not enough its 1/3, so the now requirement of the output torque to drive motors also reduces accordingly.
So the principal character of this phenomenon is, in a heating cycle, can there is peak point in load torque in start-up course, and in the groundwork period thereafter, and load torque can be much smaller than this peak torque, conventionally less than its 1/3.This just requires starter motor in start-up course, to possess 3 times of overload capacity more than nominal torque, and the torque overload ability maximum of the present large motor of main flow is only 2 times of its nominal torque, can not meet the needs of technical grade direct supercurrent induction heater.
This phenomenon that the peak point of load torque and the peak point of bearing power are separated in a work period, has brought very large difficulty to the design of direct supercurrent induction heater drive system.Because, the output torque of drive system and power normally design according to its rated condition (i.e. in the heating cycle main heating period), and generally can not cross the peak point of load torque at enough large torques of start-up course output (3 times and above in its nominal torque) as the selected motor of standard.If according to the method for common choice of electrical machine and principle, choose the motor that output torque and power all can meet load request, this will cause motor rated power is the more than 3 times of bearing power, this is a kind of waste greatly from economy, particularly for the superconduction induction heater (its heating power is conventionally more than 300kw) of technical grade, so type selecting can increase the manufacturing cost of spindle drive part greatly, and then can produce serious negative effect to the business potential of this product and competitiveness.
Therefore, the torque peak that direct supercurrent induction heater occurs in start-up course has exceeded the torque overload ability of existing motor, thereby cause startup obstacle, be the new problem running in the R&D process of this new equipment of direct supercurrent induction heater, current not yet have report and an achievement that this is studied.
Utility model content
The utility model, for above shortcomings in prior art, provides a kind of direct supercurrent induction heating motor starting device based on reduction box.
The utility model is achieved through the following technical solutions.
According to an aspect of the present utility model, a kind of direct supercurrent induction heating motor starting device based on reduction box is provided, comprising: main electric system and auxiliary starting system, described main electric system is connected with load spindle respectively with auxiliary starting system; Described auxiliary starting system comprises as lower module:
-reduction box starts module, comprising: reduction box clutch, reduction box and stand-by motor, and described load spindle is connected with reduction box by reduction box clutch, and described reduction box is connected with stand-by motor; Between described load spindle and reduction box clutch, can depart from;
Described reduction box starts module and is connected with load spindle.
Preferably, described auxiliary starting system also comprise following any or appoint multiple modules:
-flywheel energy storage module;
-take off magnetic starting module;
Described flywheel energy storage module with take off magnetic starting module and be connected with load spindle respectively.
Preferably, described flywheel energy storage module comprises: flywheel clutch, flywheel and flywheel drive motors, and described load spindle is connected with flywheel by flywheel clutch, and described flywheel is connected with flywheel drive motors; Between described load spindle and flywheel clutch, can depart from.
Preferably, described in, taking off magnetic starting module comprises: flux control unit, described load spindle changes spindle magnetic field by flux control unit.
Preferably, described flux control unit change spindle magnetic field comprise following any or appoint various ways:
Size of current in-change magnet exciting coil;
The air gap distance in-regulating load spindle space of living in;
The magnetic field magnetic circuit in-shielding load spindle space of living in.
The direct supercurrent induction heating motor starting device based on reduction box that the utility model provides, the phenomenon of the peak load torque much larger than torque at rated load occurring in start-up course for technical grade direct supercurrent induction heater, and the challenge of bringing to device driver system thus, proposition possesses the solution of commercial Application feasibility and commercial value.
Thereby the utility model has successfully solved the torque overload ability that torque peak that existing direct supercurrent induction heater occurs in start-up course exceeded existing motor and has caused the problem that starts obstacle, give full play to the performance of main electric system, greatly reduce the manufacturing cost of technical grade direct supercurrent induction heater drive system, solve again the problem of the main electric system output torque deficiency that occurs that in start-up course torque peak causes, reduced the manufacturing cost of equipment, the business potential to this device and the market competitiveness have been brought positive effect.
Brief description of the drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present utility model will become:
Fig. 1 is conventional AC induction heating equipment;
Fig. 2 is traditional direct supercurrent induction heating equipment;
Fig. 3 is bearing power and the torque variation relation figure with rotating speed;
Fig. 4 is the utility model embodiment 1 principle assumption diagram.
Embodiment
Below embodiment of the present utility model is elaborated: the present embodiment is implemented under taking technical solutions of the utility model as prerequisite, provided detailed execution mode and concrete operating process.It should be pointed out that to those skilled in the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.
Refer to Fig. 4.
In following examples:
Start-up course: spindle is from starting rotation until the overall process between predetermined operating state;
Predetermined operating state: comprise at least two indexs: spindle rotating speed and spindle magnetic field all reach predetermined state;
Spindle magnetic field: comprise when spindle is static and spindle when rotation two states, in the time that spindle is static, the magnetic field mean value in spindle space of living in; In the time that spindle rotates, the magnetic field in spindle space of living in is because inductive loop can change to some extent, " spindle magnetic field " now refers to, in the situation that keeping other states constant (exciting current, magnet structure etc.), and the magnetic field mean value in space of living under the static stable state of spindle;
Main electric system: under rated condition, the main provider who drives spindle to rotate required torque and power.
Embodiment 1
The present embodiment provides a kind of direct supercurrent induction heating motor starting device based on reduction box, comprising: main electric system and auxiliary starting system, described main electric system is connected with load spindle respectively with auxiliary starting system.
Described auxiliary starting system comprises that reduction box starts module, and described reduction box starts module and is connected with load spindle.
Described reduction box starts module and comprises: reduction box clutch, reduction box and stand-by motor, and described load spindle is connected with reduction box by reduction box clutch, and described reduction box is connected with stand-by motor; Between described load spindle and reduction box clutch, can depart from.
The direct supercurrent induction heating motor starting device based on reduction box that the present embodiment provides, its starting method is: power output and the torque parameter of main electric system design according to rated condition, meanwhile, utilize stand-by motor and reduction box to carry out the output of low-power high torque (HT); Each work period startup stage, reduction box is started to module and main electric system is used in conjunction with, make main electric system cross load torque peak point, realize the rotation of load spindle started; When the output torque that accelerates to main electric system when load spindle can meet load request, transfer to by main electric system and drive load spindle to rotate.
The present embodiment is specially:
Power output and the torque parameter of main electric system design according to rated condition, utilize common electric machine and the startup system that can carry out the output of low-power high torque (HT) of reduction box design simultaneously, each work period startup stage, this startup system and main electric system are used in conjunction with, be that main electric system can be crossed load torque peak point, realize the rotation of spindle is started.When the output torque that accelerates to main electric system when spindle can meet load request, mainly drive spindle to rotate by main electric system.The logical construction of this scheme is illustrated in fig. 5 shown below.It is emphasized that this figure only represents operation principle and the logical construction of this scheme, does not represent or limit the physical structure of this scheme.
According to rated condition or the groundwork interval of spindle in the work period, carry out the main electric system of design driven spindle rotation.This main electric system main feature is the requirement that the indexs such as its overall power output, output torque, rotating speed, efficiency meet spindle rated condition or groundwork interval.This main electric system can be made up of a motor, also can be made up of multiple electric motors; Can comprise frequency converter, also can not comprise frequency converter.
In start-up course, export the deficiency of torque phase for load torque for making up main electric system, design one with common electric machine and reduction box and can carry out low-power, large torque, the drive system of slow-speed of revolution output, the output torque of this system, the load characteristic of the main electric systems of parameter Main Basis such as power and corresponding rotating speed and in the work period load torque and power determine with the change curve of rotating speed, by selecting different motors and the reduction box of different no-load voltage ratios, can make this system can meet required power, torque request, thereby auxiliary main electric system is crossed load torque peak point, realize the startup to spindle rotation.
The course of work of the present embodiment is: for a complete work period (heating a spindle), drive spindle rotation startup stage, drive spindle to rotate by the main electric system acting in conjunction of above-mentioned auxiliary starting system, when spindle rotates to predetermined a certain rotating speed, when main electric system can independently meet load request, start clutch auxiliary starting system is separated with spindle, after this mainly drive spindle to rotate by main electric system.This process, the rotating speed of spindle is monitored in real time, and startup system separates the rotating speed in moment and determines in the process of Design assistant startup system with spindle.
The present embodiment is in the process starting, and main electric system also can not provide driving power and torque to spindle.But it must reach corresponding rotating speed when auxiliary starting system departs from.
Embodiment 2
The present embodiment provides a kind of direct supercurrent induction heating motor starting device based on reduction box, comprising: main electric system and auxiliary starting system, described main electric system is connected with load spindle respectively with auxiliary starting system.
Described auxiliary starting system, on the basis of embodiment 1, also comprises flywheel energy storage module, and described flywheel energy storage module is connected with load spindle.
Described flywheel energy storage module comprises: flywheel clutch, flywheel and flywheel drive motors, and described load spindle is connected with flywheel by flywheel clutch, and described flywheel is connected with flywheel drive motors; Between described load spindle and flywheel clutch, can depart from.
The direct supercurrent induction heating motor starting device based on reduction box that the present embodiment provides, its starting method is:
Power output and the torque parameter of main electric system design according to rated condition, meanwhile, utilize stand-by motor and reduction box to carry out the output of low-power high torque (HT); Spindle rotation startup stage, utilize flywheel that enough large torque is provided, and reduction box started to module and main electric system is used in conjunction with, assist main electric system to cross load torque peak point; When the output torque that accelerates to main electric system when load spindle can meet load request, flywheel comes off, and after this mainly drives load spindle to rotate by main electric system.
Embodiment 3
The present embodiment provides a kind of direct supercurrent induction heating motor starting device based on reduction box, comprising: main electric system and auxiliary starting system, described main electric system is connected with load spindle respectively with auxiliary starting system.
Described auxiliary starting system, on the basis of embodiment 1, also comprises and takes off magnetic starting module, described in take off magnetic starting module and be connected with load spindle.
The described magnetic starting module that takes off comprises: flux control unit, described load spindle changes spindle magnetic field by flux control unit.
Described flux control unit change spindle magnetic field comprise following any or appoint various ways:
Size of current in-change magnet exciting coil;
The air gap distance in-regulating load spindle space of living in;
The magnetic field magnetic circuit in-shielding load spindle space of living in.
The direct supercurrent induction heating motor starting device based on reduction box that the present embodiment provides, its starting method is:
Power output and the torque parameter of main electric system design according to rated condition, meanwhile, utilize stand-by motor and reduction box to carry out the output of low-power high torque (HT); Each work period startup stage, reduction box is started to module and main electric system is used in conjunction with, make main electric system cross load torque peak point, realize the rotation of load spindle is started, simultaneously, utilize reverse induction electromagnetic torque in load spindle with spindle magnetic field reduce and the principle that reduces, startup stage reduce the magnetic field in load spindle space of living in, thereby reduce load torque until can make main electric system start smoothly; When the output torque that accelerates to main electric system when load spindle can meet load request, in the scope of main electric system output torque overload ability, when increasing speed, start to strengthen magnetic field, until magnetic field and rotating speed all reach rated condition, meanwhile, transfer to by main electric system and drive load spindle to rotate.
Embodiment 4
The present embodiment provides a kind of direct supercurrent induction heating motor starting device based on reduction box, comprising: main electric system and auxiliary starting system, described main electric system is connected with load spindle respectively with auxiliary starting system.
Described auxiliary starting system on the basis of embodiment 1, also comprise described in embodiment 2 and embodiment 3 as lower module:
-flywheel energy storage module;
-take off magnetic starting module;
Described flywheel energy storage module, reduction box start module and take off magnetic starting module and be connected with load spindle respectively.
The direct supercurrent induction heating motor starting device based on reduction box that the present embodiment provides, its starting method is:
Power output and the torque parameter of main electric system design according to rated condition, meanwhile, utilize stand-by motor and reduction box to carry out the output of low-power high torque (HT); Spindle rotation startup stage, utilize flywheel that enough large torque is provided, and reduction box is started to module and main electric system is used in conjunction with, simultaneously, utilize reverse induction electromagnetic torque in load spindle with spindle magnetic field reduce and the principle that reduces, startup stage reduce the magnetic field in load spindle space of living in, thereby reduce load torque until can make main electric system start smoothly, auxiliary main electric system is crossed load torque peak point; When the output torque that accelerates to main electric system when load spindle can meet load request, flywheel comes off, and after this mainly drives load spindle to rotate by main electric system.
Above specific embodiment of the utility model is described.It will be appreciated that, the utility model is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present utility model.
Claims (5)
1. the direct supercurrent induction heating motor starting device based on reduction box, is characterized in that, comprising: main electric system and auxiliary starting system, and described main electric system is connected with load spindle respectively with auxiliary starting system; Described auxiliary starting system comprises as lower module:
-reduction box starts module, comprising: reduction box clutch, reduction box and stand-by motor, and described load spindle is connected with reduction box by reduction box clutch, and described reduction box is connected with stand-by motor; Between described load spindle and reduction box clutch, can depart from.
2. the direct supercurrent induction heating motor starting device based on reduction box according to claim 1, is characterized in that, described auxiliary starting system also comprise following any or appoint multiple modules:
-flywheel energy storage module;
-take off magnetic starting module;
Described flywheel energy storage module with take off magnetic starting module and be connected with load spindle respectively.
3. the direct supercurrent induction heating motor starting device based on reduction box according to claim 2, it is characterized in that, described flywheel energy storage module comprises: flywheel clutch, flywheel and flywheel drive motors, described load spindle is connected with flywheel by flywheel clutch, and described flywheel is connected with flywheel drive motors; Between described load spindle and flywheel clutch, can depart from.
4. the direct supercurrent induction heating motor starting device based on reduction box according to claim 2, is characterized in that, described in take off magnetic starting module and comprise: flux control unit, described load spindle changes spindle magnetic field by flux control unit.
5. the direct supercurrent induction heating motor starting device based on reduction box according to claim 4, is characterized in that, described flux control unit change spindle magnetic field comprise following any or appoint various ways:
Size of current in-change magnet exciting coil;
The air gap distance in-regulating load spindle space of living in;
The magnetic field magnetic circuit in-shielding load spindle space of living in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420070078.6U CN203747699U (en) | 2014-02-18 | 2014-02-18 | Reduction gearbox-based superconductive direct-current induction heating motor starting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420070078.6U CN203747699U (en) | 2014-02-18 | 2014-02-18 | Reduction gearbox-based superconductive direct-current induction heating motor starting device |
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| CN203747699U true CN203747699U (en) | 2014-07-30 |
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| CN201420070078.6U Withdrawn - After Issue CN203747699U (en) | 2014-02-18 | 2014-02-18 | Reduction gearbox-based superconductive direct-current induction heating motor starting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103916055A (en) * | 2014-02-18 | 2014-07-09 | 上海超导科技股份有限公司 | Superconductivity direct-current induction heating motor starting device based on reduction gearbox and method thereof |
-
2014
- 2014-02-18 CN CN201420070078.6U patent/CN203747699U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103916055A (en) * | 2014-02-18 | 2014-07-09 | 上海超导科技股份有限公司 | Superconductivity direct-current induction heating motor starting device based on reduction gearbox and method thereof |
| CN103916055B (en) * | 2014-02-18 | 2016-03-30 | 上海超导科技股份有限公司 | Based on direct supercurrent induction heating motor starting device and the method thereof of reduction box |
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Granted publication date: 20140730 Effective date of abandoning: 20160330 |
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