CN103916054B - Heating motor starting device and method thereof is sensed based on the direct supercurrent taking off magnetic - Google Patents
Heating motor starting device and method thereof is sensed based on the direct supercurrent taking off magnetic Download PDFInfo
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- CN103916054B CN103916054B CN201410054844.4A CN201410054844A CN103916054B CN 103916054 B CN103916054 B CN 103916054B CN 201410054844 A CN201410054844 A CN 201410054844A CN 103916054 B CN103916054 B CN 103916054B
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Abstract
The invention discloses a kind of based on the direct supercurrent sensing heating motor starting device taking off magnetic, including: mair motor system and auxiliary starting system, described mair motor system is connected with load spindle respectively with auxiliary starting system; Described auxiliary starting system includes taking off magnetic starting module, described in take off magnetic starting module and include: flux control unit, described load spindle changes spindle magnetic field by flux control unit; The described magnetic starting module that takes off is connected with load spindle. Additionally provide its starting method. The present invention successfully solves torque peak in existing start-up course and causes the problem starting obstacle beyond motor torque overload capacity, give full play to the performance of mair motor system, reduce the manufacturing cost of technical grade direct supercurrent induction heater drive system, reducing the manufacturing cost of equipment, business potential and the market competitiveness to this device bring positive effect.
Description
Technical field
The present invention relates to induction heating technique field, specifically a kind of based on the direct supercurrent sensing heating motor starting device and the method thereof that take off magnetic.
Background technology
Sensing heating is based on a kind of mode of heating of faraday-Lenz's electromagnetic induction principle, have quick, clean, be convenient for surface and local heating and the in most of the cases advantage such as energy-conservation. From the twenties in 20th century, abroad starting to introduce the alternating current impression heating utilizing electromagnetic eddy to heat, recent year also progressively adopts. Traditional alternating current impression mode of heating, its operation principle is: allow alternating current pass through to be produced alternating magnetic field by the coil of water-cooled copper coiling, so that the spindle endogenous cause of ill electromagnetic induction principle being arranged in coil produces eddy current, eddy current flows in spindle and produces Joule heat heated material. Now, the cooled water of the electrical loss that copper coil resistance produces is taken out of, as shown in Figure 1.
Current this induction heating technique has two main technical bottlenecks: one is the efficiency of heating surface, this kind of heating means are for ferrimagnet, the significantly high efficiency of heating surface can be obtained, but when adopt heat the less nonmagnetic material of the resistivity such as aluminum, copper in this way time, the electrical efficiency of heater is made to become very low owing to the ohmic loss of coil significantly increases, it is only 50%-60%, cause huge energy loss, and it being limited by the characteristic of the method itself, its efficiency has been difficult to have promote significantly again; Two is heating accuracy, the degree of depth that aluminium shape surface is limited and minimum can only be carried out temperature Synchronous Heating by conventional AC induction heating equipment, the heating in deeper region mostly realizes by material self conduction of heat, so the section bar depth part temperature difference is big, material local soft or hard not only can be caused man-hour at subsequent extrusion to differ with adding, thus causing the defects such as micro-crack, and the outside waste that also result in the energy than internal high remaining temperature out; When requiring higher to heating accuracy, the method is difficult to meet user's requirement, and improves heat penetration, it is thus achieved that more uniform heats, and the manufacture for modern high end shape (such as aluminium section bar) has very important meaning; Conventional AC induction heating method improves heat penetration mainly through the method for frequency reducing, and the large-scale alternating current impression firing equipment of present main flow mostly adopts power frequency. Reduce frequency raising sensing heat penetration further the manufacture of contemporary metal section bar is meant a great, but its encountered technological challenge and manufacturing cost pressure are very huge, so the induction heating apparatus of modern large-scale main flow stops at power frequency mostly.
Thus, direct supercurrent sensing is heated as the important research direction of sensing heating at present. The operation principle of direct supercurrent sensing heating is, direct current is allowed to produce strong dc magnetic field by the magnet being made up of superconducting coil and to allow motor drive aluminium ingot or copper ingot to rotate (i.e. conductor cutting magnetic line) in this D.C. magnetic field, thus forming eddy current in spindle also 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 the heat effect of electricity, and along with the increase of number of revolutions, the temperature of spindle will continue to raise. So the heat energy of spindle virtually all derives from the mechanical energy of motor output; And simultaneously because adopt direct current, superconducting coil there's almost no energy loss, and even allowing for the power that refrigeration system consumes, it is compared to heating power also very little, so the efficiency of whole firing equipment depends primarily on the efficiency of motor. Existing motor manufacturing technology makes the operational efficiency of motor height very, generally can reach more than 90%, so, compared to the conventional AC induction heating technique efficiency of heating surface for the low-resistivity nonferromugnetic material such as aluminum, copper, direct supercurrent induction heating technique can be greatly improved the efficiency of heating surface. Meanwhile, for the spindle of certain specification, its heat penetration depends primarily on rotating speed, and rotating speed is more low, and heat penetration is more big. The rotating speed of spindle is controlled by motor, thus can improve heat penetration by the rotating speed of reduction motor. So, compared to conventional AC induction heater, direct supercurrent induction heater has obviously advantage in the efficiency of heating surface and heating uniformity.
Find through retrieval, " CommercialInductionHeatersWithHigh-TemperatureSupercondu ctorCoils " literary composition that MagneRunde et al. delivers on " IEEETRANSACTIONSONAPPLIEDSUPERCONDUCTIVITY " is mentioned: southern US San Francisco ZenergyPower company is that a German aluminium extrusion company provides a direct current induction heating apparatus. As it is shown on figure 3, this device by superconducting magnet, refrigerating plant, add hot cell and four major parts of motor form. One little chest equipped with commercially available refrigerator is arranged at the top of magnet, provides low temperature environment for magnet. The D.C. magnetic field that magnet produces penetrates two and heat insulation adds in hot cell, and spindle within it rotates. The motor at spindle two ends provides rotary power, and these motors can slide the spindle to adapt to different length. Motor does not make it produce any infringement or deformation equipped with flange to clamp spindle when rotated. Superconducting magnet is fastened in unusually strong box hat.
Chinese Patent Application No.: 200880112972.2, patent name: the method for sensing heating metal works. this patent readme is: a kind of rotate, relative to the D.C. magnetic field penetrating this workpiece, being distinguished by of method that the sensing of described metal works is heated to desired temperature by making metal works, described workpiece is clamped at and is suitable between two jaws of coaxial rotation, at least one in described jaw is driven in rotation, at least one in described jaw fits along or is parallel to the actively displacement of described rotating shaft, the contact force of at least one in described jaw is adjusted, and at least one mechanical parameter representing the temperature of described workpiece is measured as actual value and compared 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 metal spindle, it has the yoke of E tee section, being provided with superconducting coil on the medial fascicle of described yoke, described induction heater has the trap between each being each located in described medial fascicle and two lateral branches. This spindle can be heated by making each in two traps of spindle rotates.
Chinese Patent Application No.: 200880100216.8, patent name: induction heating method. This patent readme is: by during making the spindle of conductive material sense the described spindle of heating relative to the magnetic field rotating being carried the generation of galvanic superconduction winding by least one on iron core, reverse induction voltage can be reduced by producing in described winding and maintaining D. C. value, 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 lower than when the zero current condition of described winding.
For the above-mentioned direct current induction heating method based on rotary spindle inductive loop, parts of the normally off key of drive motor right and wrong. The type selecting of drive motor must is fulfilled for two conditions: one is the needs that output disclosure satisfy that whole heating process, and two is the needs that output torque disclosure satisfy that whole heating process. Practice and calculating all show, for larger-diameter spindle (blank aluminium bar used in Large size Aluminium goods extrusion processes enterprise, its bore is generally at more than 200mm), under a certain magnetic field determined, adopting direct current induction heating method, there is, with the change of rotating speed, the trend being illustrated in fig. 3 shown below in induction heating power and reverse induction electromagnetic torque in spindle. Spindle in this figure is certain non-ferromagnetic metal spindle of diameter 300mm. This figure is presented below as two principal characters: first, and induced power increases with the increase of rotating speed; Second, reverse electromagnetic torque, when rotating ratio is relatively low, increases with the increase of rotating speed, after reaching certain peak value, reduces with the increase of rotating speed again. In actual commercial Application, the main heating interval of spindle, rotating speed interval residing for it is typically much deeper than the rotating speed corresponding to reverse electromagnetic torque peak value, so, in each heating cycle, the peak point that the start-up course of drive motor occurs when must cross the reverse electromagnetic torque slow-speed of revolution of spindle, namely in start-up course, the output torque of drive motor to possess the ability crossing this load peak point. Thereafter, at the main heating interval of spindle, spindle is sensed the reverse electromagnetic torque produced much smaller than peak torque, generally not enough its 1/3, so, now the requirement of the output torque of drive motor is also reduced accordingly.
So, being mainly characterized by of this phenomenon, in a heating cycle, can there is peak point in start-up course in load torque, and the groundwork period behind, load torque can much smaller than this peak torque, be typically less than its 1/3. This just requires to start motor and possesses the overload capacity of more than 3 times of nominal torques in start-up course, and maximum be only its nominal torque 2 times of torque overload ability of the big motor of main flow now, it is impossible to 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 working cycle, brings very big difficulty to the design of direct supercurrent induction heater drive system. Because, the output torque of drive system and power usually design according to its declared working condition (i.e. main heating interval in the heating cycle), and the motor selected as standard generally can not export sufficiently large torque (3 times and above in its nominal torque) in start-up course and cross the peak point of load torque. If method and the principle according to common choice of electrical machine, choose output torque and power all can meet the motor of load request, this will cause that motor rated power is more than 3 times of bearing power, this is a kind of waste greatly economy, superconduction induction heater (its heating power is generally at more than 300kw) especially for technical grade, such type selecting can be greatly increased the manufacturing cost of spindle drive part, and then the business potential of this product and competitiveness can be produced serious negative effect.
Therefore, the torque peak that direct supercurrent induction heater occurs in start-up course is beyond the torque overload ability of existing motor, thus causing startup obstacle, it is the new problem run in the R&D process of this new equipment of direct supercurrent induction heater, currently not yet has this is carried out studies report and achievement.
Summary of the invention
The present invention is directed to above shortcomings in prior art, it is provided that a kind of based on the direct supercurrent sensing heating motor starting device and the method thereof that take off magnetic.
The present invention is achieved by the following technical solutions.
According to an aspect of the present invention, provide a kind of based on the direct supercurrent sensing heating motor starting device taking off magnetic, it is characterized in that, including: mair motor system and auxiliary starting system, described mair motor system is connected with load spindle respectively with auxiliary starting system; Described auxiliary starting system includes such as lower module:
-take off magnetic starting module, described in take off magnetic starting module and include: flux control unit, described load spindle changes spindle magnetic field by flux control unit;
The described magnetic starting module that takes off is connected with load spindle.
Preferably, described auxiliary starting system also includes such as lower module:
-reduction box starts module;
Described reduction box starts module and is connected with load spindle.
Preferably, described reduction box starts module and includes: 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; Can depart between described load spindle and reduction box clutch.
Preferably, described flux control unit change spindle magnetic field include following any one or appoint various ways:
-change the size of current in control coil;
The air gap distance in space residing for-regulating load spindle;
The magnetic field magnetic circuit in space residing for-shielding load spindle.
According to another aspect of the present invention, it is provided that a kind of starting method sensing heating motor starting device based on the direct supercurrent taking off magnetic, including any one step following:
-when auxiliary starting system includes taking off magnetic starting module, starting method particularly as follows:
Step A, the output of mair motor system and torque parameter design according to declared working condition; Utilize the principle that in load spindle, reverse induction electromagnetic torque reduces with the reduction in magnetic field, startup stage reduce the spindle magnetic field in space residing for load spindle, thus reducing load torque until mair motor system can be made to start smoothly; After spindle rotating speed crosses load torque peak point, exporting in the scope of torque overload ability in mair motor system, what increase speed starts simultaneously at increasing magnetic field, until magnetic field and rotating speed all reach declared working condition;
-include taking off magnetic starting module and reduction box starts module when auxiliary starting system, starting method particularly as follows:
Step B, the output of mair motor system and torque parameter design according to declared working condition, meanwhile, utilize stand-by motor and reduction box to carry out low-power high torque (HT) output; Each working cycle startup stage, reduction box is started module and mair motor system with the use of, mair motor system is made to cross load torque peak point, realize the rotation of load spindle is started, simultaneously, utilize the principle that in load spindle, reverse induction electromagnetic torque reduces with the reduction in spindle magnetic field, startup stage reduce the magnetic field in space residing for load spindle, thus reducing load torque until mair motor system can be made to start smoothly; When the output torque that load spindle accelerates to mair motor system disclosure satisfy that load request, export in the scope of torque overload ability in mair motor system, what increase speed starts simultaneously at increasing magnetic field, until magnetic field and rotating speed all reach declared working condition, meanwhile, transfer to by the rotation of mair motor system drive load spindle.
Provided by the invention based on the direct supercurrent sensing heating motor starting device and the method thereof that take off magnetic, phenomenon for the peak load torque much larger than torque at rated load that technical grade direct supercurrent induction heater occurs in start-up course, and the challenge thus brought to device driver system, it is proposed to possess the solution of commercial Application feasibility and commercial value.
The present invention successfully solves torque peak that existing direct supercurrent induction heater occurs in the start-up course torque overload ability beyond existing motor thus causing the problem starting obstacle, give full play to the performance of mair motor system, greatly reduce the manufacturing cost of technical grade direct supercurrent induction heater drive system, solve again in start-up course, occur that the mair motor system that torque peak causes exports the problem that torque is not enough, reducing the manufacturing cost of equipment, business potential and the market competitiveness to this device bring positive effect.
Accompanying drawing explanation
By reading detailed description non-limiting example made with reference to the following drawings, the other features, objects and advantages of the present invention will become more apparent upon:
Fig. 1 is conventional AC induction heating apparatus;
Fig. 2 is tradition direct supercurrent induction heating apparatus;
Fig. 3 determines under magnetic field for certain non-ferromagnetic metal spindle a certain, and electromagnetic power and electromagnetic torque are with rotation speed change trendgram;
Fig. 4 is the embodiment of the present invention 1 principle assumption diagram;
Fig. 5 is embodiment 1 load torque, exciting current, spindle rotation speed change trendgram;
Fig. 6 regulates spindle magnetic field structure schematic diagram for changing air gap distance;
Fig. 7 is that shielding circuit method regulates spindle magnetic field structure schematic diagram;
In figure: 1 is iron core, 2 is spindle.
Detailed description of the invention
Below embodiments of the invention are elaborated: the present embodiment is carried out under premised on technical solution of the present invention, give detailed embodiment and concrete operating process. It should be pointed out that, to those skilled in the art, without departing from the inventive concept of the premise, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention.
Please refer to Fig. 4 to Fig. 7.
In the examples below:
Start-up course: spindle is from starting the overall process that is rotated up between predetermined duty;
Predetermined duty: comprise at least two index: spindle rotating speed and spindle magnetic field all reach predetermined state;
Spindle magnetic field: include spindle static time and spindle rotate time two states, when spindle is static, the magnetic field average in space residing for spindle; When spindle rotates, the magnetic field in space residing for spindle can change due to inductive loop, " spindle magnetic field " now refers to and is keeping other states constant (exciting current, magnet structure etc.), the magnetic field average in residing space under the static stable state of spindle;
Mair motor system: under declared working condition, drives spindle to rotate the main provider of required torque and power.
Embodiment 1
Present embodiments provide a kind of based on the direct supercurrent sensing heating motor starting device taking off magnetic, including: mair motor system and auxiliary starting system, described mair motor system is connected with load spindle respectively with auxiliary starting system.
Described auxiliary starting system includes taking 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 includes: flux control unit, and described load spindle is connected with flux control unit magnetic, and changes spindle magnetic field by flux control unit.
Described flux control unit change spindle magnetic field include following any one or appoint various ways:
-change the size of current in control coil;
The air gap distance in space residing for-regulating load spindle;
The magnetic field magnetic circuit in space residing for-shielding load spindle.
The direct supercurrent sensing heating motor starting device that the present embodiment provides, its starting method is: the output of mair motor system and torque parameter design according to declared working condition; Utilize the principle that in load spindle, reverse induction electromagnetic torque reduces with the reduction in magnetic field, startup stage reduce the spindle magnetic field in space residing for load spindle, thus reducing load torque until mair motor system can be made to start smoothly; After spindle rotating speed crosses load torque peak point, exporting in the scope of torque overload ability in mair motor system, what increase speed starts simultaneously at increasing magnetic field, until magnetic field and rotating speed all reach declared working condition.
The present embodiment particularly as follows:
The output of mair motor system and torque parameter design according to declared working condition, utilize the principle that in spindle, reverse induction electromagnetic torque reduces with the reduction in magnetic field, startup stage reduce the magnetic field in space residing for spindle, thus reducing load torque until mair motor system can be made to start smoothly; After spindle rotating speed crosses load torque peak point, export in the scope of torque overload ability in mair motor system, start simultaneously at increasing magnetic field what increase speed, until magnetic field and rotating speed all reach declared working condition. The logical structure of the program is illustrated in fig. 6 shown below. It is emphasized that this figure only represents operation principle and the logical structure of the program, be not offered as or limit the physical arrangement of the program.
The mair motor system that design driven spindle rotates is carried out according to the declared working condition of spindle in the working cycle or groundwork interval. This mair motor system is mainly characterized by the index such as its overall output power, output torque, rotating speed, efficiency and meets spindle declared working condition or the requirement in groundwork interval. This mair motor system can be made up of a motor, it is also possible to is made up of multiple electric motors; Converter can be comprised, it is also possible to do not comprise converter. The ultimate principle of the present embodiment is: when rotating speed and spindle size are certain, and the reverse electromagnetic torque (i.e. load torque) sensing generation in spindle can reduce with the reduction in magnetic field. Such then can when the overload capacity of mair motor system can not meet load request, load torque is reduced, so that spindle smoothly completes rotation and starts, hereafter along with the rising of rotating speed by reducing magnetic field, according to the overload capacity of mair motor system, progressively recover magnetic field to rated condition.
The implementation process of the present embodiment is: be first depending on the load characteristic of mair motor system and the load torque power curve with rotation speed change, calculate startup stage required magnetic field value, and spindle space magnetic field is adjusted to corresponding size. Subsequently, the process that mair motor drives spindle to start is monitored spindle rotating speed in real time, in order to reduce the time of start-up course as much as possible, can according to the overload capacity of mair motor system or load torque standard set in advance, regulate spindle magnetic field in real time, until spindle magnetic field and rotating speed all reach declared working condition. If the startup time is not required or requires relatively low by user, it is also possible to treat that rotating speed regulates spindle magnetic field again to predetermined value after reaching predetermined value.
As it is shown in fig. 7, illustrate a case of the present embodiment, in case, the load torque in start-up course being set in 10000N*m, regulating spindle magnetic field by regulating exciting current, thus load torque being constrained in 10000N*m in whole start-up course; When spindle accelerates to 250rpm, exciting current (spindle magnetic field) namely recovers to predetermined state 200A.
The mode regulating spindle magnetic field can be various ways, can adjustment exciting current as implied above, when field magnet is cored, the air gap distance in space residing for spindle can be regulated as shown in Figure 6, can partly shielding effect spindle magnetic circuit as shown in Figure 7, it is also possible to be both the above or multiple method with the use of. It is in a word, all that can regulate spindle magnetic field and not affect the method for other normal functions of equipment can.
Embodiment 2
Present embodiments provide a kind of based on the direct supercurrent sensing heating motor starting device taking off magnetic, including: mair motor system and auxiliary starting system, described mair motor system is connected with load spindle respectively with auxiliary starting system.
Described auxiliary starting system, on the basis of embodiment 1, also includes reduction box and starts module, and described reduction box starts module and is connected with load spindle.
Described reduction box starts module and includes: 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; Can depart between described load spindle and reduction box clutch.
What the present embodiment provided senses heating motor starting device based on the direct supercurrent taking off magnetic, and its starting method is:
The output of mair motor system and torque parameter design according to declared working condition, meanwhile, utilize stand-by motor and reduction box to carry out low-power high torque (HT) output; Each working cycle startup stage, reduction box is started module and mair motor system with the use of, mair motor system is made to cross load torque peak point, realize the rotation of load spindle is started, simultaneously, utilize the principle that in load spindle, reverse induction electromagnetic torque reduces with the reduction in spindle magnetic field, startup stage reduce the magnetic field in space residing for load spindle, thus reducing load torque until mair motor system can be made to start smoothly; When the output torque that load spindle accelerates to mair motor system disclosure satisfy that load request, export in the scope of torque overload ability in mair motor system, what increase speed starts simultaneously at increasing magnetic field, until magnetic field and rotating speed all reach declared working condition, meanwhile, transfer to by the rotation of mair motor system drive load spindle.
Above specific embodiments of the invention are described. It is to be appreciated that the invention is not limited in above-mentioned particular implementation, those skilled in the art can make various deformation or amendment within the scope of the claims, and this has no effect on the flesh and blood of the present invention.
Claims (5)
1. one kind senses heating motor starting device based on the direct supercurrent taking off magnetic, it is characterised in that including: mair motor system and auxiliary starting system, described mair motor system is connected with load spindle respectively with auxiliary starting system; Described auxiliary starting system includes such as lower module:
-take off magnetic starting module, described in take off magnetic starting module and include: flux control unit, described load spindle changes spindle magnetic field by flux control unit;
The described magnetic starting module that takes off is connected with load spindle.
2. according to claim 1 based on the direct supercurrent sensing heating motor starting device taking off magnetic, it is characterised in that described auxiliary starting system also includes such as lower module:
-reduction box starts module;
Described reduction box starts module and is connected with load spindle.
3. according to claim 2 based on the direct supercurrent sensing heating motor starting device taking off magnetic, it is characterized in that, described reduction box starts module and includes: reduction box clutch, reduction box and stand-by motor, described load spindle is connected with reduction box by reduction box clutch, and described reduction box is connected with stand-by motor; Can depart between described load spindle and reduction box clutch.
4. according to claim 3 based on take off magnetic direct supercurrent sense heating motor starting device, it is characterised in that described flux control unit change spindle magnetic field include following any one or appoint various ways:
-change the size of current in control coil;
The air gap distance in space residing for-regulating load spindle;
The magnetic field magnetic circuit in space residing for-shielding load spindle.
5. the starting method sensing heating motor starting device based on the direct supercurrent taking off magnetic described in a claim 4, it is characterised in that include any one step following:
-when auxiliary starting system includes taking off magnetic starting module, starting method particularly as follows:
Step A, the output of mair motor system and torque parameter design according to declared working condition; Utilize the principle that in load spindle, reverse induction electromagnetic torque reduces with the reduction in magnetic field, startup stage reduce the spindle magnetic field in space residing for load spindle, thus reducing load torque until mair motor system can be made to start smoothly; After spindle rotating speed crosses load torque peak point, exporting in the scope of torque overload ability in mair motor system, what increase speed starts simultaneously at increasing magnetic field, until magnetic field and rotating speed all reach declared working condition;
-include taking off magnetic starting module and reduction box starts module when auxiliary starting system, starting method particularly as follows:
Step B, the output of mair motor system and torque parameter design according to declared working condition, meanwhile, utilize stand-by motor and reduction box to carry out low-power high torque (HT) output; Each working cycle startup stage, reduction box is started module and mair motor system with the use of, mair motor system is made to cross load torque peak point, realize the rotation of load spindle is started, simultaneously, utilize the principle that in load spindle, reverse induction electromagnetic torque reduces with the reduction in spindle magnetic field, startup stage reduce the magnetic field in space residing for load spindle, thus reducing load torque until mair motor system can be made to start smoothly; When the output torque that load spindle accelerates to mair motor system disclosure satisfy that load request, export in the scope of torque overload ability in mair motor system, what increase speed starts simultaneously at increasing magnetic field, until magnetic field and rotating speed all reach declared working condition, meanwhile, transfer to by the rotation of mair motor system drive load spindle.
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| CN105071703A (en) * | 2015-06-24 | 2015-11-18 | 李泽华 | Reduction gearbox-based superconductive direct-current induction heating motor starting device |
| CN110996421B (en) * | 2019-11-26 | 2022-02-08 | 江西联创光电超导应用有限公司 | Method and equipment for adjusting axial temperature distribution of conductor blank |
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| CN101766050A (en) * | 2007-07-26 | 2010-06-30 | 泽奈基电力公司 | Induction heater |
| CN101803453A (en) * | 2007-07-26 | 2010-08-11 | 泽奈基电力公司 | Induction heating method |
| CN101836501A (en) * | 2007-10-24 | 2010-09-15 | 泽奈基电力公司 | Method for inductive heating of a metallic workpiece |
| CN203747700U (en) * | 2014-02-18 | 2014-07-30 | 上海超导科技股份有限公司 | Demagnetization-based superconductive direct-current induction heating motor starting device |
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| JP2005031234A (en) * | 2003-07-09 | 2005-02-03 | Sharp Corp | Induction heating apparatus, image forming apparatus equipped with the same, induction heating method, program, and recording medium having program recorded thereon |
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| CN101766050A (en) * | 2007-07-26 | 2010-06-30 | 泽奈基电力公司 | Induction heater |
| CN101803453A (en) * | 2007-07-26 | 2010-08-11 | 泽奈基电力公司 | Induction heating method |
| CN101836501A (en) * | 2007-10-24 | 2010-09-15 | 泽奈基电力公司 | Method for inductive heating of a metallic workpiece |
| CN203747700U (en) * | 2014-02-18 | 2014-07-30 | 上海超导科技股份有限公司 | Demagnetization-based superconductive direct-current induction heating motor starting device |
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